Linear ANALOG DEVICES DC2448A-B Quick setup guide

1
dc2448abf
DEMO MANUAL
DC2448A-B
Description
LTM4636
High Efficiency, PolyPhase 120A
Step-Down Power µModule Regulator
Demonstration circuit DC2448A-B features a PolyPhase
®
design using the LTM
®
4636EY, a 40A high efficiency,
switch mode step-down power µModule
®
regulator. The
input voltage range is from 4.7V to 15V. When VIN<5.5V,
short PVCC to VIN with R1 = 0Ω, and set R3 = 0Ω and
remove R2. The output voltage range is 0.6V to 3.3V. The
DC2448A-B can deliver a nominal 120A output current. As
explained in the data sheet, output current derating is nec-
essary for certain VIN, VOUT, and thermal conditions. The
board operates in continuous conduction mode in heavy
load conditions. For high efficiency at low load currents,
the MODE_PLLIN jumper selects pulse-skipping mode
for noise sensitive applications or Burst Mode
®
operation
L, LT, LTC, LTM, Linear Technology, Burst Mode, µModule, PolyPhase and the Linear logo
are registered trademarks of Analog Devices, Inc. All other trademarks are the property of their
respective owners.
BoarD photo
in less noise sensitive applications. The MODE_PLLIN
pin also allows the LTM4636 to synchronize to an exter-
nal clock signal. The phases of the three LTM4636s are
0degrees, 120degrees and 240degrees. DC2448A-B has
the option of choosing both internal and external com-
pensation circuit for LTM4636. The LTM4636 data sheet
must be read in conjunction with this demo manual prior
to working on or modifying demo circuit DC2448A-B.
Design files for this circuit board are available at
http://www.linear.com/demo/DC2448A-B

2
dc2448abf
DEMO MANUAL
DC2448A-B
Quick start proceDure
Demonstration circuit DC2448A-B is an easy way to
evaluate the performance of PolyPhase operation of the
LTM4636EY. Due to the high input/output current, the
user should select the proper input supply/load/cable
which can sustain the full load operation. Please refer to
Figure 1 for proper measurement equipment setup and
follow the procedure below:
1. Place jumpers in the following positions for a typical
application:
MODE RUN
CCM ON
2. With power off, connect the input power supply, load
and meters as shown in Figure 1. Preset the load to 0A
and VIN supply to 12V.
3. Turn on the power supply at the input. The output volt-
age should be 0.9V ± 1.3% (0.888V to 0.912V).
4. Vary the input voltage from 6V to 15V and adjust the
load current from 0A to 120A. Observe the output
voltage regulation, ripple voltage, efficiency and other
parameters.
5. (Optional) For optional load transient test, apply an
adjustable pulse signal between IOSTEP_CLK and GND
test points. The pulse amplitude sets the load step cur-
rent amplitude. Keep the pulse width short (<1ms) and
pulse duty cycle low (<5%) to limit the thermal stress
on the load transient circuit.
6. (Optional) LTM4636 can be synchronized to an external
clock signal. Apply a clock signal (0V to 5V, square
wave) on the MODE_PLLIN test point.
7. (Optional) The outputs of LTM4636 can track another
supply. The output voltage tracks the voltage on TRACK
when a valid signal is applied on the test point.
performance summary
Specifications are at TA= 25°C
PARAMETER CONDITIONS VALUE
Input Voltage Range 4.7V to 15V
Output Voltages 0.9V ±1.3%
Maximum Continuous Output Current Derating is necessary for certain operating conditions. See data sheet for details. 120ADC
Operating Frequency 350kHz
Efficiency VIN = 12V, VOUT = 0.9V, IOUT = 120A 85.9% Figure 2
Load Transient VOUT(P-P) VIN = 12V, VOUT = 0.9V, ISTEP = 0A TO 30A 91mV Figure 3

3
dc2448abf
DEMO MANUAL
DC2448A-B
Quick start proceDure
Figure 1. Measurement Setup of DC2448A-B
DC2448AB F01
LOAD
+–
+
–
VIN
+
–
+–
+–

4
dc2448abf
DEMO MANUAL
DC2448A-B
Quick start proceDure
Figure 2. Measured Efficiency at VIN = 12V, fSW=350kHz, CCM
Figure 3. Measured Load Transient
VIN = 12V, VOUT=0.9V, ISTEP=0Ato30A
OUTPUT CURRENT (A)
EFFICIENCY (%)
DC2448AB F02
65
70
75
80
85
90
95
0 120.0100.080.060.040.020.0
0.9VOUT
1.0VOUT
1.2VOUT
1.5VOUT
1.8VOUT
50µs/DIV
VOUT
50mV/DIV
IOUT_STEP
20A/DIV
DC2448AB F03

5
dc2448abf
DEMO MANUAL
DC2448A-B
Quick start proceDure
Figure 4. Thermal Capture at VIN = 12V, VOUT=0.9V, 120A (TA=25°C, 200LFM Airflow and No Heat Sink)
ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER
Required Circuit Components
1 3 C1, C14, C19 CAP., 22µF, X7R, 10V, 10%, 1206 MURATA, GRM31CR71A226KE15L
2 3 C2, C15, C20 CAP., 4.7µF, X5R, 25V, 20%, 0805 MURATA, GRM21BR61E475MA12L
3 1 C8 CAP., 100pF, X7R, 50V, 10%, 0603 AVX, 06035C101KAT2A
4 2 C9, C10 CAP., 0.47µF, X7R, 10V, 10%, 0603 AVX, 0603ZC474KAT2A
MURATA, GRM188R71A474KA61D
5 2 C29, C30 CAP
., 10µF, X5R, 6.3V, 10%, 0805 MURATA, GRM21BR60J106KE19L
6 16 C31, C32, CO1, CO2, CO3, CO4, CO7,
CO8, CO9, CO10, CO11, CO14, CO15,
CO16, CO17, CO18
CAP., 100µF, X5R, 6.3V, 20%, 1210 MURATA, GRM32ER60J107ME20L
7 1 CIN1 CAP., 150µF, ALUM., 35V, 20%, 10x10.5mm,
SMD, HVH SERIES
SUN ELECTRONIC INDUSTRIES CORP,
35HVH150M
8 12 CIN2, CIN3, CIN4, CIN5, CIN6, CIN7,
CIN8, CIN9, CIN10, CIN11, CIN12, CIN13
CAP., 22µF, X5R, 25V, 10%, 1210 AVX, 12103D226KAT2A
MURATA, GRM32ER61E226KE15L
9 6 CO5, CO6, CO12, CO13, CO19, CO20 CAP., 470µF, TANT. POLY., 4V, 20%, 7343, D3L PANASONIC, 4TPE470MCL
10 1 R14 RES., 10k, 1%, 1/10W, 0603 KOA SPEER, RK73H1JTTD1002F
PANASONIC, ERJ3EKF1002V
VISHAY, CRCW060310K0FKEA
parts List

6
dc2448abf
DEMO MANUAL
DC2448A-B
ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER
11 1 R20 RES., 4.99k, 1%, 1/10W, 0603 NIC, NRC06F4991TRF
VISHAY, CRCW06034K99FKEA
12 3 R22, R51, R60 RES., 34.8k, 1%, 1/10W, 0603 VISHAY, CRCW060334K8FKEA
YAGEO, RC0603FR-0734K8L
13 3 U1, U2, U3 IC, HIGH EFFICIENCY 40A µMODULE LINEAR TECHNOLOGY, LTM4636EY#PBF
Additional Demo Board Circuit Components
1 3 C6, C17, C22 CAP., 2200pF, X7R, 50V, 10%, 0603 AVX, 06035C222KAT2A
2 1 C33 CAP., 1µF, X7R, 16V, 10%, 0603 AVX, 0603YC105KAT2A
NIC, NMC0603X7R105K16TRPF
TDK, C1608X7R1C105K080AC
3 1 Q3 XSTR., MOSFET, N-CH, 40V, TO-252 VISHAY, SUD50N04-8M8P-4GE3
4 6 R2, R19, R45, R50, R54, R59 RES., 0Ω, 1/10W, 0603 NIC, NRC06ZOTRF
VISHAY, CRCW06030000Z0EA
5 4 R4, R5, R12, R15 RES., 10k, 5%, 1/10W, 0603, AEC-Q200 PANASONIC, ERJ3GEYJ103V
VISHAY, CRCW060310K0JNEA
6 1 R7 RES., 0.01Ω, 1%, 1W, 2010, HIGH POWER VISHAY, WSL2010R0100FEA18
7 2 R8, R9 RES., 51Ω, 5%, 1/10W, 0603 VISHAY, CRCW060351R0JNEA
8 3 R18, R49, R58 RES., 2.2Ω, 5%, 1/8W, 0805, AEC-Q200 VISHAY, CRCW08052R20JNEA
9 4 R24, R26, R32, R37 RES., 0Ω, 3/4W, 2010, AEC-Q200 VISHAY, CRCW20100000Z0EF
10 1 R25 RES., 0Ω, 1W, 2512, SENSE VISHAY, WSL251200000ZEA9
11 1 R76 RES., 0Ω, 1W, 2010, SENSE, AEC-Q200 VISHAY, WSL201000000ZEA9
Hardware: For Demo Board Only
1 27 E1, E2, E3, E5, E6, E9, E10, E11, E12,
E13, E14, E15, E17, E18, E19, E24, E25,
E27, E30, E31, E32, E34, E37, E38, E39,
E43, E44
TEST POINT, TURRET, 0.064", MTG. HOLE MILL-MAX, 2308-2-00-80-00-00-07-0
2 2 E7, E8 TEST POINT, TURRET, 0.094", MTG. HOLE MILL-MAX, 2501-2-00-80-00-00-07-0
3 6 J1, J2, J5, J6, J7, J8 WASHER, FLAT, STEEL, ZINC PLATE, OD: 0.436
[11.1]
KEYSTONE, 4703
4 6 J1, J2, J5, J6, J7, J8 RING, LUG, CRIMP, #10, NON-INSULATED,
SOLDERLESS TERMINALS
KEYSTONE, 8205
5 6 J1, J2, J5, J6, J7, J8 STUD, FASTENER, #10-32 PENNENGINEERING, KFH-032-10ET
6 6 J1, J2, J5, J6, J7, J8 NUT, HEX, STEEL, ZINC PLATE, 10-32 KEYSTONE, 4705
7 2 J3, J4 CONN., SMA RF COAX, PCB JACK RCPT, THT, STR MOLEX, 73391-0060
8 1 JP1 CONN., HDR., MALE, 1x4, 2mm, THT, STR SAMTEC, TMM-104-02-L-S
9 1 JP2 CONN., HDR., MALE, 1x3, 2mm, THT
, STR SAMTEC, TMM-103-02-L-S
10 4 MH1, MH2, MH3, MH4 STANDOFF, NYLON, SNAP-ON, 0.250" KEYSTONE, 8831
WURTH ELEKTRONIK, 702931000
11 2 XJP1, XJP2 CONN., SHUNT
, FEMALE, 2 POS, 2mm SAMTEC, 2SN-BK-G
parts List

7
dc2448abf
DEMO MANUAL
DC2448A-B
schematic Diagram
5
5
4
4
3
3
2
2
1
1
D
D
C
C
B
B
A
A
NOTE:UNLESSOTHERWISESPECIFIED,
1.ALLCAPACITORS,RESISTORS0603. SEELTM4636/LTM4636‐1DATASHEET
U1,U2,U3,ANDU4ARECONNECTEDINPARALLELTODEVELOP160AMPDESIGN.
WHENVIN<5.5V,SHORTPVCCTOVINWITHR1=0OHM,ANDSETR3=0OHMANDREMOVER2. R11=100KFOROVPTRIPOF1V
CONNECTVOUT(0.9V)TOLOADSTEPGENERATORTHROUGHR24,R26,R32,R37FORTRANSIENTTESTING R19ISSETTO0OHMFORONBOARDCOMPENSATION,ORUNSTUFFR19FOREXTERNALOPTIMIZEDCOMPENSATION.
R11CANBECHANGEDTOTHEDESIREDRESISTORVALUEFORSETTINGTHEOVP.
ORR11CANBESTUFFEDWITH0OHMRESISTORTODISABLEOVP.
U1,U2,U3,U4,TMONPINSCANBEGROUNDEDTODISABLEOVERTEMPPROTECTIONFOREACHSPECIFICDEVICE.
ASSY IC -A -B -C
U1,U2
U1,U2,U3 U1,U2 U3,U4
IOUT 80A 120A 160A
R17 OPT
0
OPT
R16
0
OPT OPT
R56 OPT
R65 OPT OPT
0
CIN10-CIN13
OPT 22uF 22uF
CIN14-CIN17
OPT OPT 22uF
CO19,CO20
OPT 470uF 470uF
CO26,CO27
OPT OPT 470uF
OPT
CO14-CO18
100uF 100uF
CO21-CO25
OPT OPT 100uF
[2]ASSEMBLYOPTIONS.
[2]
[2]
OPT
0
-D U1,U2 U3,U4 160A 0 0 22uF 22uF 470uF 470uF 100uF 100uF0OPT
R71,R73,R74,R75
66.5K 1%
R11
100K 1% 0.001 1%
0 0 0 R25
OPT R76 0 0 0
OPT OPT OPT
OPT OPT OPT
R47 OPT OPT
0 0
PGOOD
COMP
CLKOUT_U1
RUN
TRACK/SS VFB
HIZREG
OVP_TRIP
OVER_TEMP
GND_SNS CROWBAR
VIN_HS
INTVCC_U1
INTVCC_U1
VOUT
INTVCC_U1
INTVCC_U1
INTVCC_U1
INTVCC_U1
VIN_HS VIN_HS
BIAS
BIAS
INTVCC_U1
SIZE DATE:
IC NO. REV.
SHEET OF
TITLE:
APPROVALS
PCB DES.
APP ENG.
TECHNOLOGY
Fax: [phone]
Milpitas, CA 95035 Phone: [phone]
1630 McCarthy Blvd.
LTC CONFIDENTIAL - FOR CUSTOMER USE ONLY
CUSTOMER NOTICE
LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS; HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL APPLICATION. COMPONENT SUBSTITUTION AND PRINTED CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT PERFORMANCE OR RELIABILITY. CONTACT LINEAR TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE. THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SCHEMATIC
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
SCALE = NONE
www.linear.com
4
DEMO CIRCUIT 2448A
Friday, March 10, 2017
15
FOUR PHASE, STEP-DOWN MODULE
N/A
LTM4636EY/LTM4636EY-1
` \
l _
REGULATOR WITH HOTSWAP INPUT
SIZE DATE:
IC NO. REV.
SHEET OF
TITLE:
APPROVALS
PCB DES.
APP ENG.
TECHNOLOGY
Fax: [phone]
Milpitas, CA 95035 Phone: [phone]
1630 McCarthy Blvd.
LTC CONFIDENTIAL - FOR CUSTOMER USE ONLY
CUSTOMER NOTICE
LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS; HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL APPLICATION. COMPONENT SUBSTITUTION AND PRINTED CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT PERFORMANCE OR RELIABILITY. CONTACT LINEAR TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE. THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SCHEMATIC
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
SCALE = NONE
www.linear.com
4
DEMO CIRCUIT 2448A
Friday, March 10, 2017
15
FOUR PHASE, STEP-DOWN MODULE
N/A
LTM4636EY/LTM4636EY-1
` \
l _
REGULATOR WITH HOTSWAP INPUT
SIZE DATE:
IC NO. REV.
SHEET OF
TITLE:
APPROVALS
PCB DES.
APP ENG.
TECHNOLOGY
Fax: [phone]
Milpitas, CA 95035 Phone: [phone]
1630 McCarthy Blvd.
LTC CONFIDENTIAL - FOR CUSTOMER USE ONLY
CUSTOMER NOTICE
LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS; HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL APPLICATION. COMPONENT SUBSTITUTION AND PRINTED CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT PERFORMANCE OR RELIABILITY. CONTACT LINEAR TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE. THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SCHEMATIC
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
SCALE = NONE
www.linear.com
4
DEMO CIRCUIT 2448A
Friday, March 10, 2017
15
FOUR PHASE, STEP-DOWN MODULE
N/A
LTM4636EY/LTM4636EY-1
` \
l _
REGULATOR WITH HOTSWAP INPUT
REVISION HISTORY
DESCRIPTION DATE APPROVEDECO REV
l _
PROD
-403/08/17
REVISION HISTORY
DESCRIPTION DATE APPROVEDECO REV
l _
PROD
-403/08/17
REVISION HISTORY
DESCRIPTION DATE APPROVEDECO REV
l _
PROD
-403/08/17
+
CO5
470uF 4V
7343
E44
BIAS
C7 OPT
J3
VOUT
C6
2200pF
CIN5
22uF 25V
1210
R71 [2]
E4
PWM1
C8 100pF
J8
VOUT
R11 [2]
JP1
BM
CCM
MODE
PS
1 3 2 4
R18 2.2
0805
R22
34.8k 1%
C2
0805
4.7uF
E10
CROWBAR
CO1
100uF 6.3V 1210
E1 TEMP+_U1
+
CIN1 150uF
35V
R15
10K
CIN3
22uF 25V
1210
E14
OVP_TRIP
E9
HIZREG
R3
OPT
R8
51
E16
SW1
E6
GND
J2 GND
R17 [2]
C5 OPT
C1
22uF
1206
R20
4.99k
CIN2
22uF 25V
1210
+
CO6
470uF 4V 7343
E19
TMON_U1
J7 GND J1
0.9V/160A
VOUT
R12
10K
E15
GND_SNS
C4 OPT
CIN4
22uF 25V
1210
E2
CLKOUT_U1
CO4
100uF 6.3V 1210
R21 OPT
E13
OVER_TEMP
R5 10K
E18
RUN
JP2
ON
OFF
RUN
1 3 2
C9 0.47uF
R14 10k 1%
R16 [2]
E11
VOUT_SNS
C10
0.47uF
R19
0
R2
0
R9
51
U1
LTM4636EY/LTM4636EY-1
GMON
H9
SNSP1
F2
TEST3
H2
HIZREG
F3
PGOOD
E1
SW
L11
RUNP
G8
CLKOUT
G3
SNSP2
F1
TEST2
F5
RUNC
E2
TRACK/SS
E3
VFB
E4
TEST4/CROWBAR
E11
GND
M9
GND
M10
GND/OVP_SET
E12
COMPB
D5
COMPA
E5
NC/BIAS
G9
PHASEMD
G7
TEMP+
G12
TEMP-
G11
GND
M12
VOSNS1
D4
VOSNS-
D3
GND/OVP_TRIP
E10
INTVCC
F6
MODE_PLLIN
H3
PWM
H7
PVcc
F9
GND/OVER_TEMP
D10
TEST1
H4
GND
M1
FREQ
G5
GND
M2
TMON
H8
GND
M11
SGND
G4
SGND
F4
SW
K11
VOUT
A1
VOUT
A2
VOUT
A3
VOUT
A4
VOUT
A5
VOUT
A6
VOUT
A7
VOUT
A8
VOUT
A9
VOUT
A10
VOUT
A11
VOUT
A12
VOUT
B1
VOUT
B2
VOUT
B3
VOUT
B4
VOUT
B5
VOUT
B6
VOUT
B7
VOUT
B8
VOUT
B9
VOUT
B10
VOUT
B11
VOUT
B12
VOUT
C1
VOUT
C2
VOUT
C3
VOUT
C4
VOUT
C5
VOUT
C6
VOUT
C7
VOUT
C8
VOUT
C9
VOUT
C10
VOUT
C11
VOUT
C12
VOUT
D1
VOUT
D2
VOUT
D11
VOUT
D12
GND
M3
GND
D6
GND
D7
GND
D8
GND
D9
GND
E6
GND
E7
GND
E8
GND
E9
GND
F7
GND
F8
GND
F10
GND/OTP_SET
F11
GND
F12
GND
G1
GND
G2
GND
G6
GND
G10
GND
H10
GND
H11
GND
H12
GND
H1
GND
J1
GND
J2
GND
J3
GND
J8
GND
J9
GND
J10
GND
J11
GND
J12
GND
K1
GND
K2
GND
K3
GND
K9
GND
K10
GND
K12
GND
L1
GND
L2
GND
L3
GND
L9
GND
L10
GND
L12
VIN
H5
VIN
H6
VIN
J4
VIN
J5
VIN
J6
VIN
J7
VIN
K4
VIN
K5
VIN
K6
VIN
K7
VIN
K8
VIN
L4
VIN
L5
VIN
L6
VIN
L7
VIN
L8
VIN
M4
VIN
M5
VIN
M6
VIN
M7
VIN
M8
E5
VIN_HS
E12
PGOOD
E3 TEMP-_U1
CO3
100uF 6.3V 1210
C33 1uF
CO2
100uF 6.3V 1210
E17
MODE_PLLIN
R72 OPT R13 OPT
R1 OPT
PVcc
PVcc
PGOOD
RUN

8
dc2448abf
DEMO MANUAL
DC2448A-B
schematic Diagram
5
5
4
4
3
3
2
2
1
1
D
D
C
C
B
B
A
A
WHENVIN<5.5V,SHORTPVCCTOVINWITHR44=0OHM,ANDSETR43=0OHMANDREMOVER45. R50CANBESETTO0OHMFORONBOARDCOMPENSATION,ORUNSTUFFEDFOREXTERNALOPTIMIZEDCOMPENSATION.

COMP
CLKOUT_U2
RUN
PGOOD
VFB
HIZREG
OVER_TEMP
CLKOUT_U1
GND_SNS TRACK/SS
VOUT
VIN_HS
VIN_HS VIN_HS
BIAS
BIAS
SIZE DATE:
IC NO. REV.
SHEET OF
TITLE:
APPROVALS
PCB DES.
APP ENG.
TECHNOLOGY
Fax: [phone]
Milpitas, CA 95035 Phone: [phone]
1630 McCarthy Blvd.
LTC CONFIDENTIAL - FOR CUSTOMER USE ONLY
CUSTOMER NOTICE
LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS; HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL APPLICATION. COMPONENT SUBSTITUTION AND PRINTED CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT PERFORMANCE OR RELIABILITY. CONTACT LINEAR TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE. THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SCHEMATIC
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
SCALE = NONE
www.linear.com
4
DEMO CIRCUIT 2448A
Friday, March 10, 2017
25
FOUR PHASE, STEP-DOWN MODULE
N/A
LTM4636EY/LTM4636EY-1
` \
l _
REGULATOR WITH HOTSWAP INPUT
SIZE DATE:
IC NO. REV.
SHEET OF
TITLE:
APPROVALS
PCB DES.
APP ENG.
TECHNOLOGY
Fax: [phone]
Milpitas, CA 95035 Phone: [phone]
1630 McCarthy Blvd.
LTC CONFIDENTIAL - FOR CUSTOMER USE ONLY
CUSTOMER NOTICE
LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS; HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL APPLICATION. COMPONENT SUBSTITUTION AND PRINTED CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT PERFORMANCE OR RELIABILITY. CONTACT LINEAR TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE. THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SCHEMATIC
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
SCALE = NONE
www.linear.com
4
DEMO CIRCUIT 2448A
Friday, March 10, 2017
25
FOUR PHASE, STEP-DOWN MODULE
N/A
LTM4636EY/LTM4636EY-1
` \
l _
REGULATOR WITH HOTSWAP INPUT
SIZE DATE:
IC NO. REV.
SHEET OF
TITLE:
APPROVALS
PCB DES.
APP ENG.
TECHNOLOGY
Fax: [phone]
Milpitas, CA 95035 Phone: [phone]
1630 McCarthy Blvd.
LTC CONFIDENTIAL - FOR CUSTOMER USE ONLY
CUSTOMER NOTICE
LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS; HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL APPLICATION. COMPONENT SUBSTITUTION AND PRINTED CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT PERFORMANCE OR RELIABILITY. CONTACT LINEAR TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE. THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SCHEMATIC
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
SCALE = NONE
www.linear.com
4
DEMO CIRCUIT 2448A
Friday, March 10, 2017
25
FOUR PHASE, STEP-DOWN MODULE
N/A
LTM4636EY/LTM4636EY-1
` \
l _
REGULATOR WITH HOTSWAP INPUT
CIN8
22uF 25V
1210
C17
2200pF
CO10
100uF 6.3V 1210
R48
OPT
E30
TMON_U2
R47
[2]
C14
22uF
1206
E26
PWM2
E24
TEMP-_U2
R45
0
R73 [2]
CO9
100uF 6.3V 1210
R44 OPT
C16 OPT
CIN9
22uF 25V
1210
R50
0
E28
SW2
CIN7
22uF 25V
1210
R49 2.2
0805
U2
LTM4636EY/LTM4636EY-1
GMON
H9
SNSP1
F2
TEST3
H2
HIZREG
F3
PGOOD
E1
SW
L11
RUNP
G8
CLKOUT
G3
SNSP2
F1
TEST2
F5
RUNC
E2
TRACK/SS
E3
VFB
E4
TEST4/CROWBAR
E11
GND
M9
GND
M10
GND/OVP_SET
E12
COMPB
D5
COMPA
E5
NC/BIAS
G9
PHASEMD
G7
TEMP+
G12
TEMP-
G11
GND
M12
VOSNS1
D4
VOSNS-
D3
GND/OVP_TRIP
E10
INTVCC
F6
MODE_PLLIN
H3
PWM
H7
PVcc
F9
GND/OVER_TEMP
D10
TEST1
H4
GND
M1
FREQ
G5
GND
M2
TMON
H8
GND
M11
SGND
G4
SGND
F4
SW
K11
VOUT
A1
VOUT
A2
VOUT
A3
VOUT
A4
VOUT
A5
VOUT
A6
VOUT
A7
VOUT
A8
VOUT
A9
VOUT
A10
VOUT
A11
VOUT
A12
VOUT
B1
VOUT
B2
VOUT
B3
VOUT
B4
VOUT
B5
VOUT
B6
VOUT
B7
VOUT
B8
VOUT
B9
VOUT
B10
VOUT
B11
VOUT
B12
VOUT
C1
VOUT
C2
VOUT
C3
VOUT
C4
VOUT
C5
VOUT
C6
VOUT
C7
VOUT
C8
VOUT
C9
VOUT
C10
VOUT
C11
VOUT
C12
VOUT
D1
VOUT
D2
VOUT
D11
VOUT
D12
GND
M3
GND
D6
GND
D7
GND
D8
GND
D9
GND
E6
GND
E7
GND
E8
GND
E9
GND
F7
GND
F8
GND
F10
GND/OTP_SET
F11
GND
F12
GND
G1
GND
G2
GND
G6
GND
G10
GND
H10
GND
H11
GND
H12
GND
H1
GND
J1
GND
J2
GND
J3
GND
J8
GND
J9
GND
J10
GND
J11
GND
J12
GND
K1
GND
K2
GND
K3
GND
K9
GND
K10
GND
K12
GND
L1
GND
L2
GND
L3
GND
L9
GND
L10
GND
L12
VIN
H5
VIN
H6
VIN
J4
VIN
J5
VIN
J6
VIN
J7
VIN
K4
VIN
K5
VIN
K6
VIN
K7
VIN
K8
VIN
L4
VIN
L5
VIN
L6
VIN
L7
VIN
L8
VIN
M4
VIN
M5
VIN
M6
VIN
M7
VIN
M8
CO8
100uF 6.3V 1210
C18 OPT
CO7
100uF 6.3V 1210
R51
34.8k
1%
CIN6
22uF 25V
1210
CO11
100uF 6.3V 1210
E25
TEMP+_U2
+
CO12
470uF 4V 7343
E27
CLKOUT_U2
R43
OPT
+
CO13
470uF 4V 7343
E29
TRACK/SS
C15
0805
4.7uF
PVcc

9
dc2448abf
DEMO MANUAL
DC2448A-B
schematic Diagram
5
5
4
4
3
3
2
2
1
1
D
D
C
C
B
B
A
A
WHENVIN<5.5V,SHORTPVCCTOVINWITHR52=0OHM,ANDSETR53=0OHMANDREMOVER54. R59CANBESETTO0OHMFORONBOARDCOMPENSATION,ORUNSTUFFEDFOREXTERNALOPTIMIZEDCOMPENSATION.

VFB
HIZREG
OVER_TEMP
CLKOUT_U2
COMP
CLKOUT_U3
RUN
PGOOD
GND_SNS TRACK/SS
VOUT
VIN_HS
VIN_HS VIN_HS
BIAS
BIAS
SIZE DATE:
IC NO. REV.
SHEET OF
TITLE:
APPROVALS
PCB DES.
APP ENG.
TECHNOLOGY
Fax: [phone]
Milpitas, CA 95035 Phone: [phone]
1630 McCarthy Blvd.
LTC CONFIDENTIAL - FOR CUSTOMER USE ONLY
CUSTOMER NOTICE
LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS; HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL APPLICATION. COMPONENT SUBSTITUTION AND PRINTED CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT PERFORMANCE OR RELIABILITY. CONTACT LINEAR TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE. THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SCHEMATIC
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
SCALE = NONE
www.linear.com
4
DEMO CIRCUIT 2448A
Friday, March 10, 2017
35
FOUR PHASE, STEP-DOWN MODULE
N/A
LTM4636EY/LTM4636EY-1
` \
l _
REGULATOR WITH HOTSWAP INPUT
SIZE DATE:
IC NO. REV.
SHEET OF
TITLE:
APPROVALS
PCB DES.
APP ENG.
TECHNOLOGY
Fax: [phone]
Milpitas, CA 95035 Phone: [phone]
1630 McCarthy Blvd.
LTC CONFIDENTIAL - FOR CUSTOMER USE ONLY
CUSTOMER NOTICE
LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS; HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL APPLICATION. COMPONENT SUBSTITUTION AND PRINTED CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT PERFORMANCE OR RELIABILITY. CONTACT LINEAR TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE. THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SCHEMATIC
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
SCALE = NONE
www.linear.com
4
DEMO CIRCUIT 2448A
Friday, March 10, 2017
35
FOUR PHASE, STEP-DOWN MODULE
N/A
LTM4636EY/LTM4636EY-1
` \
l _
REGULATOR WITH HOTSWAP INPUT
SIZE DATE:
IC NO. REV.
SHEET OF
TITLE:
APPROVALS
PCB DES.
APP ENG.
TECHNOLOGY
Fax: [phone]
Milpitas, CA 95035 Phone: [phone]
1630 McCarthy Blvd.
LTC CONFIDENTIAL - FOR CUSTOMER USE ONLY
CUSTOMER NOTICE
LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS; HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL APPLICATION. COMPONENT SUBSTITUTION AND PRINTED CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT PERFORMANCE OR RELIABILITY. CONTACT LINEAR TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE. THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SCHEMATIC
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
SCALE = NONE
www.linear.com
4
DEMO CIRCUIT 2448A
Friday, March 10, 2017
35
FOUR PHASE, STEP-DOWN MODULE
N/A
LTM4636EY/LTM4636EY-1
` \
l _
REGULATOR WITH HOTSWAP INPUT
E37
TMON_U3
+
CO19
[2] 4V 7343
E33
PWM3
R54
0
R58 2.2
0805
R56
[2]
U3
LTM4636EY/LTM4636EY-1
GMON
H9
SNSP1
F2
TEST3
H2
HIZREG
F3
PGOOD
E1
SW
L11
RUNP
G8
CLKOUT
G3
SNSP2
F1
TEST2
F5
RUNC
E2
TRACK/SS
E3
VFB
E4
TEST4/CROWBAR
E11
GND
M9
GND
M10
GND/OVP_SET
E12
COMPB
D5
COMPA
E5
NC/BIAS
G9
PHASEMD
G7
TEMP+
G12
TEMP-
G11
GND
M12
VOSNS1
D4
VOSNS-
D3
GND/OVP_TRIP
E10
INTVCC
F6
MODE_PLLIN
H3
PWM
H7
PVcc
F9
GND/OVER_TEMP
D10
TEST1
H4
GND
M1
FREQ
G5
GND
M2
TMON
H8
GND
M11
SGND
G4
SGND
F4
SW
K11
VOUT
A1
VOUT
A2
VOUT
A3
VOUT
A4
VOUT
A5
VOUT
A6
VOUT
A7
VOUT
A8
VOUT
A9
VOUT
A10
VOUT
A11
VOUT
A12
VOUT
B1
VOUT
B2
VOUT
B3
VOUT
B4
VOUT
B5
VOUT
B6
VOUT
B7
VOUT
B8
VOUT
B9
VOUT
B10
VOUT
B11
VOUT
B12
VOUT
C1
VOUT
C2
VOUT
C3
VOUT
C4
VOUT
C5
VOUT
C6
VOUT
C7
VOUT
C8
VOUT
C9
VOUT
C10
VOUT
C11
VOUT
C12
VOUT
D1
VOUT
D2
VOUT
D11
VOUT
D12
GND
M3
GND
D6
GND
D7
GND
D8
GND
D9
GND
E6
GND
E7
GND
E8
GND
E9
GND
F7
GND
F8
GND
F10
GND/OTP_SET
F11
GND
F12
GND
G1
GND
G2
GND
G6
GND
G10
GND
H10
GND
H11
GND
H12
GND
H1
GND
J1
GND
J2
GND
J3
GND
J8
GND
J9
GND
J10
GND
J11
GND
J12
GND
K1
GND
K2
GND
K3
GND
K9
GND
K10
GND
K12
GND
L1
GND
L2
GND
L3
GND
L9
GND
L10
GND
L12
VIN
H5
VIN
H6
VIN
J4
VIN
J5
VIN
J6
VIN
J7
VIN
K4
VIN
K5
VIN
K6
VIN
K7
VIN
K8
VIN
L4
VIN
L5
VIN
L6
VIN
L7
VIN
L8
VIN
M4
VIN
M5
VIN
M6
VIN
M7
VIN
M8
CO16
[2] 6.3V 1210
E32
TEMP+_U3
C21 OPT
CIN10
[2] 25V
1210
C22
2200pF
R60
34.8k
1%
R57
OPT
CIN12
[2] 25V
1210
E35
SW3
E34
CLKOUT_U3
+
CO20
[2] 4V 7343
E31
TEMP-_U3
CO15
[2] 6.3V 1210
R52 OPT
C19
22uF
1206
R59
0
CIN13
[2] 25V
1210
C20
0805
4.7uF
R74 [2]
C23 OPT
R53
OPT
CO17
[2] 6.3V 1210
CO18
[2] 6.3V 1210
CO14
[2] 6.3V 1210
CIN11
[2] 25V
1210
PVcc

10
dc2448abf
DEMO MANUAL
DC2448A-B
schematic Diagram
5 5
4 4
3 3
2 2
1 1
D D C C B B A A
WHENVIN<5.5V,SHORTPVCCTOVINWITHR61=0OHM,ANDSETR63=0OHMANDREMOVER62. R69 CAN BE SET TO 0 OHM FOR ON BOARD COMPENSATION, OR UNSTUFFED FOR EXTERNAL OPTIMIZED COMPENSATION.

INPUTHOTSWAP
USED ON -D VERSION ONLY
USED ON -D VERSION ONLY
VFB
HIZREG
OVER_TEMP
CLKOUT_U3
COMP
RUN
PGOOD
GND_SNS TRACK/SS
CROWBAR
VOUT
VIN_HS
VIN_HS VIN_HS
BIAS
BIAS
VIN_HS
VOUT
SIZE DATE:
IC NO. REV.
SHEET OF
TITLE:
APPROVALS
PCB DES.
APP ENG.
TECHNOLOGY
Fax: [phone]
Milpitas, CA 95035 Phone: [phone]
1630 McCarthy Blvd.
LTC CONFIDENTIAL - FOR CUSTOMER USE ONLY
CUSTOMER NOTICE
LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS; HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL APPLICATION. COMPONENT SUBSTITUTION AND PRINTED CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT PERFORMANCE OR RELIABILITY. CONTACT LINEAR TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE. THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SCHEMATIC
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
SCALE = NONE
www.linear.com
4
DEMO CIRCUIT 2448A
Friday, March 10, 2017
45
FOUR PHASE, STEP-DOWN MODULE
N/A
LTM4636EY/LTM4636EY-1
` \
l _
REGULATOR WITH HOTSWAP INPUT
SIZE DATE:
IC NO. REV.
SHEET OF
TITLE:
APPROVALS
PCB DES.
APP ENG.
TECHNOLOGY
Fax: [phone]
Milpitas, CA 95035 Phone: [phone]
1630 McCarthy Blvd.
LTC CONFIDENTIAL - FOR CUSTOMER USE ONLY
CUSTOMER NOTICE
LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS; HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL APPLICATION. COMPONENT SUBSTITUTION AND PRINTED CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT PERFORMANCE OR RELIABILITY. CONTACT LINEAR TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE. THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SCHEMATIC
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
SCALE = NONE
www.linear.com
4
DEMO CIRCUIT 2448A
Friday, March 10, 2017
45
FOUR PHASE, STEP-DOWN MODULE
N/A
LTM4636EY/LTM4636EY-1
` \
l _
REGULATOR WITH HOTSWAP INPUT
SIZE DATE:
IC NO. REV.
SHEET OF
TITLE:
APPROVALS
PCB DES.
APP ENG.
TECHNOLOGY
Fax: [phone]
Milpitas, CA 95035 Phone: [phone]
1630 McCarthy Blvd.
LTC CONFIDENTIAL - FOR CUSTOMER USE ONLY
CUSTOMER NOTICE
LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS; HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL APPLICATION. COMPONENT SUBSTITUTION AND PRINTED CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT PERFORMANCE OR RELIABILITY. CONTACT LINEAR TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE. THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SCHEMATIC
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
SCALE = NONE
www.linear.com
4
DEMO CIRCUIT 2448A
Friday, March 10, 2017
45
FOUR PHASE, STEP-DOWN MODULE
N/A
LTM4636EY/LTM4636EY-1
` \
l _
REGULATOR WITH HOTSWAP INPUT
C12 10nF
E40
PWM4
R36
10K
CIN17
[2] 25V
1210
R25 [2]
2512
CIN16
[2] 25V
1210
D2
SMBJ12A
R66
OPT
D3 GRN
C26 OPT
R29
100k
1%
CO25
[2] 6.3V 1210
R75 [2]
E41
SW4
J6
GND
R65
[2]
E23
PG
E21
ISET
U4
LTM4636EY/LTM4636EY-1
GMON
H9
SNSP1
F2
TEST3
H2
HIZREG
F3
PGOOD
E1
SW
L11
RUNP
G8
CLKOUT
G3
SNSP2
F1
TEST2
F5
RUNC
E2
TRACK/SS
E3
VFB
E4
TEST4/CROWBAR
E11
GND
M9
GND
M10
GND/OVP_SET
E12
COMPB
D5
COMPA
E5
NC/BIAS
G9
PHASEMD
G7
TEMP+
G12
TEMP-
G11
GND
M12
VOSNS1
D4
VOSNS-
D3
GND/OVP_TRIP
E10
INTVCC
F6
MODE_PLLIN
H3
PWM
H7
PVcc
F9
GND/OVER_TEMP
D10
TEST1
H4
GND
M1
FREQ
G5
GND
M2
TMON
H8
GND
M11
SGND
G4
SGND
F4
SW
K11
VOUT
A1
VOUT
A2
VOUT
A3
VOUT
A4
VOUT
A5
VOUT
A6
VOUT
A7
VOUT
A8
VOUT
A9
VOUT
A10
VOUT
A11
VOUT
A12
VOUT
B1
VOUT
B2
VOUT
B3
VOUT
B4
VOUT
B5
VOUT
B6
VOUT
B7
VOUT
B8
VOUT
B9
VOUT
B10
VOUT
B11
VOUT
B12
VOUT
C1
VOUT
C2
VOUT
C3
VOUT
C4
VOUT
C5
VOUT
C6
VOUT
C7
VOUT
C8
VOUT
C9
VOUT
C10
VOUT
C11
VOUT
C12
VOUT
D1
VOUT
D2
VOUT
D11
VOUT
D12
GND
M3
GND
D6
GND
D7
GND
D8
GND
D9
GND
E6
GND
E7
GND
E8
GND
E9
GND
F7
GND
F8
GND
F10
GND/OTP_SET
F11
GND
F12
GND
G1
GND
G2
GND
G6
GND
G10
GND
H10
GND
H11
GND
H12
GND
H1
GND
J1
GND
J2
GND
J3
GND
J8
GND
J9
GND
J10
GND
J11
GND
J12
GND
K1
GND
K2
GND
K3
GND
K9
GND
K10
GND
K12
GND
L1
GND
L2
GND
L3
GND
L9
GND
L10
GND
L12
VIN
H5
VIN
H6
VIN
J4
VIN
J5
VIN
J6
VIN
J7
VIN
K4
VIN
K5
VIN
K6
VIN
K7
VIN
K8
VIN
L4
VIN
L5
VIN
L6
VIN
L7
VIN
L8
VIN
M4
VIN
M5
VIN
M6
VIN
M7
VIN
M8
CIN15
[2] 25V
1210
R61 OPT
Q1
SUD50N04-8M8P-4GE
R40 6.49k
1%
JP4
ON
OFF
AUX_UV
1 3 2
RMON1 20K 1%
C11
10nF
R28
10K
CO21
[2] 6.3V 1210
R35
10K
C25
0805
4.7uF
C24
22uF
1206
Q4 PSMN2R0-30YLE,115
3 2
4
5
1
D5
RED
R42 9.53k 1%
D1 OPT
R39 20K 1%
+
CO26
[2] 4V 7343
E38
TEMP-_U4
D4
GRN
E43
TMON_U4
Q2
SUD50N04-8M8P-4GE
R31
10K
C28 OPT
RSET1 OPT
R62
0
CO24
[2] 6.3V 1210
R68
0
R41 1k
R63
OPT
C3 10nF
R70
34.8k 1%
E20
IMON
R38
10
E39
TEMP+_U4
C35 22pF
CO23
[2] 6.3V 1210
R76 [2]
2010
R27
0.001 1%
2512
J5
9V -14V VIN
E22
FAULT
CO22
[2] 6.3V 1210
R67 2.2
0805
C27
2200pF
R30
107k
1%
C34 10nF
+
CO27
[2] 4V 7343
R6
100k
1%
C13
0.1uF
R69
0
U5
LTC4218CGN
FB
12
SENSE+
16
NC
1
VDD
2
UV
3
GND
7
SENSE-
15
OV
4
TIMER
5
ISET
14
GATE
9
SOURCE
8
INTVCC
6
PG
10
FLT
11
IMON
13
R10
0
JP3
SIGNAL
AUTO-RETRY
FAULT
1 3 2
D6
RED
CIN14
[2] 25V
1210
PVcc
OVER_TEMP
ISET IMON
VIN
IMON ISET
OVP_TRIP

11
dc2448abf
DEMO MANUAL
DC2448A-B
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no representa-
tion that the interconnection of its circuits as described herein will not infringe on existing patent rights.
schematic Diagram
5
5
4
4
3
3
2
2
1
1
D D C C B B A A
DYNAMIC LOAD CIRCUIT
DO NOT EXCEED
5% DUTY CYCLE

LOAD_STEP VOUTLOAD_STEP
VOUT
SIZE DATE:
IC NO. REV.
SHEET OF
TITLE:
APPROVALS
PCB DES.
APP ENG.
TECHNOLOGY
Fax: [phone]
Milpitas, CA 95035 Phone: [phone]
1630 McCarthy Blvd.
LTC CONFIDENTIAL - FOR CUSTOMER USE ONLY
CUSTOMER NOTICE
LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS; HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL APPLICATION. COMPONENT SUBSTITUTION AND PRINTED CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT PERFORMANCE OR RELIABILITY. CONTACT LINEAR TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE. THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SCHEMATIC
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
SCALE = NONE
www.linear.com
4
DEMO CIRCUIT 2448A
Tuesday, November 01, 2016
55
FOUR PHASE, STEP-DOWN MODULE
N/A
LTM4636EY/LTM4636EY-1
` \
l _
REGULATOR WITH HOTSWAP INPUT
SIZE DATE:
IC NO. REV.
SHEET OF
TITLE:
APPROVALS
PCB DES.
APP ENG.
TECHNOLOGY
Fax: [phone]
Milpitas, CA 95035 Phone: [phone]
1630 McCarthy Blvd.
LTC CONFIDENTIAL - FOR CUSTOMER USE ONLY
CUSTOMER NOTICE
LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS; HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL APPLICATION. COMPONENT SUBSTITUTION AND PRINTED CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT PERFORMANCE OR RELIABILITY. CONTACT LINEAR TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE. THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SCHEMATIC
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
SCALE = NONE
www.linear.com
4
DEMO CIRCUIT 2448A
Tuesday, November 01, 2016
55
FOUR PHASE, STEP-DOWN MODULE
N/A
LTM4636EY/LTM4636EY-1
` \
l _
REGULATOR WITH HOTSWAP INPUT
SIZE DATE:
IC NO. REV.
SHEET OF
TITLE:
APPROVALS
PCB DES.
APP ENG.
TECHNOLOGY
Fax: [phone]
Milpitas, CA 95035 Phone: [phone]
1630 McCarthy Blvd.
LTC CONFIDENTIAL - FOR CUSTOMER USE ONLY
CUSTOMER NOTICE
LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS; HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL APPLICATION. COMPONENT SUBSTITUTION AND PRINTED CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT PERFORMANCE OR RELIABILITY. CONTACT LINEAR TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE. THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SCHEMATIC
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
SCALE = NONE
www.linear.com
4
DEMO CIRCUIT 2448A
Tuesday, November 01, 2016
55
FOUR PHASE, STEP-DOWN MODULE
N/A
LTM4636EY/LTM4636EY-1
` \
l _
REGULATOR WITH HOTSWAP INPUT
R4 10K R32 0
2010
E8
GND
R37 0
2010
Q3
SUD50N04-8M8P-4GE
C30
10uF 6.3V 0805
C31
100uF 6.3V 1210
C32
100uF 6.3V 1210
R26 0
2010
C29
10uF 6.3V 0805
E7
IOSTEP_CLK
R7
0.01
2010
R24 0
2010
J4
IOSTEP

12
dc2448abf
DEMO MANUAL
DC2448A-B
 LINEAR TECHNOLOGY CORPORATION 2017
LT 0917 • PRINTED IN USA
DEMONSTRATION BOARD IMPORTANT NOTICE
Linear Technology Corporation (LTC) provides the enclosed product(s) under the following AS IS conditions:
This demonstration board (DEMO BOARD) kit being sold or provided by Linear Technology is intended for use for ENGINEERING DEVELOPMENT
OR EVALUATION PURPOSES ONLY and is not provided by LTC for commercial use. As such, the DEMO BOARD herein may not be complete
in terms of required design-, marketing-, and/or manufacturing-related protective considerations, including but not limited to product safety
measures typically found in finished commercial goods. As a prototype, this product does not fall within the scope of the European Union
directive on electromagnetic compatibility and therefore may or may not meet the technical requirements of the directive, or other regulations.
If this evaluation kit does not meet the specifications recited in the DEMO BOARD manual the kit may be returned within 30 days from the date
of delivery for a full refund. THE FOREGOING WARRANTY IS THE EXCLUSIVE WARRANTY MADE BY THE SELLER TO BUYER AND IS IN LIEU
OF ALL OTHER WARRANTIES, EXPRESSED, IMPLIED, OR STATUTORY, INCLUDING ANY WARRANTY OF MERCHANTABILITY OR FITNESS
FOR ANY PARTICULAR PURPOSE. EXCEPT TO THE EXTENT OF THIS INDEMNITY, NEITHER PARTY SHALL BE LIABLE TO THE OTHER FOR
ANY INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES.
The user assumes all responsibility and liability for proper and safe handling of the goods. Further, the user releases LTC from all claims
arising from the handling or use of the goods. Due to the open construction of the product, it is the user’s responsibility to take any and all
appropriate precautions with regard to electrostatic discharge. Also be aware that the products herein may not be regulatory compliant or
agency certified (FCC, UL, CE, etc.).
No License is granted under any patent right or other intellectual property whatsoever. LTC assumes no liability for applications assistance,
customer product design, software performance, or infringement of patents or any other intellectual property rights of any kind.
LTC currently services a variety of customers for products around the world, and therefore this transaction is not exclusive.
Please read the DEMO BOARD manual prior to handling the product. Persons handling this product must have electronics training and
observe good laboratory practice standards. Common sense is encouraged.
This notice contains important safety information about temperatures and voltages. For further safety concerns, please contact a LTC application
engineer.
Mailing Address:
Linear Technology
1630 McCarthy Blvd.
Milpitas, CA 95035
Copyright © 2004, Linear Technology Corporation