Linear Technology DC2157A Quick setup guide

1
dc2157afc
DEMO MANUAL DC2157A
Description
Demonstration circuit 2157A features the LT M
®
4630EY-1,
the high efficiency,high density,dual 18A, switch mode
step-down power module regulator with ±0.8% total DC
output accuracy.The input voltage is from 4.5V to 15V.
The output voltage is programmable from 0.6V to 1.8V.
DC2157A can deliver up to 18A maximum in each channel.
With the help of external compensation, ±3% transient ac-
curacy can be achieved with 25%load step.As explained
in the data sheet,output current derating is necessary
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
MODEjumper(JP1)selects pulse-skipping mode for noise
sensitive applications or Burst Mode
®
operation in less
noisesensitiveapplications.Two outputs can be connected
in parallel for a single 36A output solution with optional
jumper resistors.The board allows the user to program
L, LT, LTC, LTM, Linear Technology, the Linear logo, µModule and Burst Mode are registered
trademarks of Linear Technology Corporation. All other trademarks are the property of their
respective owners.
BoarD photo
how its output ramps up and down through the TRACK/
SS pin.The output can be set up to either coincidentally or
ratiometrically track with another supply’s output.Remote
output voltage sensing is available for improved output
voltage regulation at the load point.These features and
the availability of the LTM4630-1 in a compact 16mm ×
16mm ×5.01mm BGA package make it ideal for use in
many high density point-of-load regulation applications.
The LTM4630-1 data sheet must be read in conjunction
with this demo manual for working on or modifying the
demo circuit DC2157A.
Design files for this circuit board are available at
http://www.linear.com/demo/DC2157A
LTM4630-1
Dual 18A or Single 36A µModule
®
Regulator with ±0.8% DC and 3%
Transient Accuracy

2
dc2157afc
DEMO MANUAL DC2157A
Quick start proceDure
performance summary
Specifications are at TA= 25°C
PARAMETER CONDITIONS VALUE
Input Voltage Range 4.5V ~ 15V
Output Voltage VOUT1 (LTM4630-1A) VIN = 4.5V ~ 15V, IOUT1 = 0A ~ 18A, JP1: CCM 1.5V ±0.8% (1.488V ~ 1.512V)
Output Voltage VOUT2 (LTM4630-1A) VIN = 4.5V ~ 15V, IOUT2 = 0A ~ 18A, JP1: CCM 1.0V ±0.8% (0.992V ~ 1.008V)
Per Channel Maximum Continuous Output Current Derating Is Necessary for Certain VIN, VOUT and Thermal
Conditions, See Data Sheet for Details
18A
Default Operating Frequency 500kHz
Resistor Programmable Frequency Range 250kHz to 780kHz
External Clock Sync. Frequency Range 400kHz to 780kHz
Efficiency of Channel 1 VIN = 5V, VOUT1 = 1.5V, IOUT1 = 18A, fSW = 500kHz 89.7% See Figure 2
Efficiency of Channel 2 VIN = 5V, VOUT2 = 1.0V, IOUT2 = 18A, fSW = 500kHz 86.2% See Figure 3
Load Transient of Channel 1 VIN = 12V, VOUT1 = 1.5V, ISTEP = 0A ~ 4.5A See Figure 4
Load Transient of Channel 2 VIN = 12V, VOUT2 = 1.0V, ISTEP = 0A ~ 4.5A See Figure 5
Demonstration circuit DC2157A is easy to set up to evalu-
ate the performance of the LTM4630-1. Please refer to
Figure 1 for proper measurement setup and follow the
procedure below:
1. Place jumpers in the following positions for a typical
application:
JP1 JP2 JP3 JP4 JP5 JP6
MODE RUN1 RUN2
TRACK1
SEL.
TRACK2
SEL.
CLKOUT
PHASE
CCM ON ON SOFT-
START
SOFT-
START
90°
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 voltage
in channel 1 should be 1.5V ±0.8% (1.488V ~ 1.512V)
and the output voltage in channel 2 should be 1.0V ±0.8%
(0.992V ~ 1.008V).
4. Once the proper output voltage is established,adjust the
load within the operating range and observe the output
voltage regulation,output voltage ripple,efficiency and
other parameters.Output ripple should be measured
at J1 and J2 with BNC cables. 50Ω termination should
be set on the oscilloscope or BNC cables.
5. (Optional) For optional load transient test,apply an
adjustable pulse signal between IOSTEP CLK and GND
test point.Pulse amplitude (3V ~ 3.5V) sets the load
step current amplitude.The output transient current
can be monitored at the BNC connector J3 (15mV/A).
The pulse signal should have very small duty cycle
(<10%) to limit the thermal stress on the transient
load circuit.Switch the jumper resistors R34 or R35
(on the backside of boards)to apply load transient on
channel1 or channel 2 correspondingly.
6. (Optional) LTM4630-1 can be synchronized to an ex-
ternal clock signal.Place the JP1 jumper on EXT_CLK
and apply a clock signal (0~5V, square wave)on the
CLKIN test point.
7. (Optional) The outputs of LTM4630-1 can track another
supply. The jumpers JP4 and JP5 allow choosing soft-
start or output tracking.If tracking external voltage is
selected, the corresponding test points,TRACK1 and
TRACK2, need to be connected to a valid voltage signal.
8. (Optional) LTM4630-1 can be configured for a 2-phase
single output at up to 36A on DC2157A. Install 0Ω
resistors on R14, R17, R28, R39 and remove R7, R19.
Output voltage is set by R25 based on equation:
VOUT = 0.6V(1 + 60.4k/R25)

3
dc2157afc
DEMO MANUAL DC2157A
Quick start proceDure
Figure 1. Test Setup of DC2157A

4
dc2157afc
DEMO MANUAL DC2157A
Quick start proceDure
0A TO 4.5A
LOAD STEP
1.5VOUT
(20MHz BW)
20mV/DIV
0A TO 4.5A
LOAD STEP
1.0VOUT
(20MHz BW)
20mV/DIV
Figure 2. Measured Efficiency on Channel 1
(VOUT1 = 1.5V, fSW = 500kHz, Channel 2 Disabled)
Figure 3. Measured Efficiency on Channel 2
(VOUT2 = 1.0V, fSW = 500kHz, Channel 1 Disabled)
Figure 4. Measured Channel 1 0A to 4.5A Load Transient
(VIN = 12V, VOUT1 = 1.5V)
Figure 5. Measured Channel 2 0A to 4.5A Load Transient
(VIN = 12V, VOUT2 = 1.0V)
Figure 6. Thermal Capture at 12VIN, 1.5VOUT1 at 18A and 1VOUT2
at 18A (TA= 25°C, 200LFM Airflow and No Heat Sink)
LOAD CURRENT (A)
0
65
EFFICIENCY (%)
70
80
85
90
4810 18
75
2 6 12 14 16
95 VIN = 5V
VIN = 12V
LOAD CURRENT (A)
0
65
EFFICIENCY (%)
70
80
85
90
4810 18
75
2 6 12 14 16
95
VIN = 5V
VIN = 12V

5
dc2157afc
DEMO MANUAL DC2157A
parts List
ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER
Required Circuit Components
1 1 CIN1 CAP., 150µF, 25V, Aluminum Electr. SUN ELECT., 25CE150AX
2 4 CIN2, CIN3, CIN4, CIN5 CAP., X5R, 22µF, 25V, 10%, 1210 MURATA, GRM32ER61E226KE15L
3 4 COUT1, COUT7, COUT11, COUT13 CAP., 470µF, 2.5V, POSCAP, F8-D3L SANYO, 2R5TPF470M6L
4 2 COUT4, COUT5 CAP., X5R, 100µF, 6.3V, 20% 1210 AVX, 12106D107MAT2A
5 1 U1 I.C., 16X16X5.01-BGA LINEAR TECH., LTM4630EY-1A#PBF
Additional Demo Board Circuit Components
6 0 COUT2, COUT3, COUT6, COUT8, COUT9,
COUT10, C0UT12, COUT14
OPT, 1210 OPT
7 1 C1 CAP., X5R, 4.7µF, 25V,10%, 0805 AVX, 08053D475KAT2A
8 1 C2 CAP., X7R, 1µF, 25V,10%, 0805 AVX, 08053C105KAT2A
9 2 C5, C7 CAP., X5R, 0.1µF, 25V, 10%, 0603 AVX, 06033D104KAT2A
10 0 C3, C4, C6, C8, C9, C11, C12 OPT, 0603 OPT
11 1 C10 CAP., X7R, 100pF, 25V, 10%, 0603 AVX, 06033C101KAT2A
12 4 C13, C14, C15, C16 CAP., X7R, 1µF, 10V,10%, 0603 AVX, 0603ZC105KAT2A
13 1 C18 CAP., X7R, 470pF, 25V, 10%, 0603 AVX, 06033C471KAT4A
14 1 C17 CAP., X7R, 1nF, 25V, 10%, 0603 AVX, 06033C102JAT2A
15 1 Q1 XSTR, MOSFET VISHAY, SUD50N04-8M8P-4GE3
16 4 R1, R3, R22, R26 RES., CHIP, 10Ω, 1%, 0603 VISHAY, CRCW060310R0FKEA
17 0 R2, R4, R6, R8, R11, R14, R16, R17, R20,
R23, R28, R31, R33, R39, R40
OPT, 0603 OPT
18 3 R24, R27, R36 RES., CHIP, 10k, 1%, 0603 VISHAY, CRCW060310K0FKEA
19 4 R7, R21, R29, R32 RES., CHIP, 0Ω, 1%, 0603 VISHAY, CRCW06030000Z0EA
20 4 R9, R12, R15, R18 RES., CHIP, 60.4k, 1%, 0603 VISHAY, CRCW060360K4FKEA
21 2 R10, R13 RES., CHIP, 6.04k, 1%, 0603 VISHAY, CRCW06036K04FKEA
22 1 R19 RES., CHIP, 90.9k, 1%, 0603 VISHAY, CRCW060390K9FKEA
23 1 R25 RES., CHIP, 40.2k, 1%, 0603 VISHAY, CRCW060340K2FKEA
24 2 R5, R30 RES., CHIP, 121k, 1%, 0603 VISHAY, CRCW0603121KFKEA
25 1 R34 RES., CHIP, 0Ω, 0.5W, 2010 VISHAY, CRCW20100000Z0EF
26 0 R35 OPT, 2010 OPT
27 1 R37 RES., CHIP, 0.015Ω, 1W, 2512 VISHAY, WSL2512R0150FEA
28 0 R38 OPT 2512 OPT
29 1 R42 RES., CHIP, 21.5k, 1%, 0603 VISHAY, CRCW060321K5FKEA
30 1 R41 RES., CHIP, 28k, 1%, 0603 VISHAY, CRCW060328K0FKEA
Hardware-For Demo Board Only
31 16 E1, E3-E10, E12-E18 TESTPOINT, TURRET, .094" MILL-MAX, 2501-2-00-80-00-00-07-0
32 3 J1, J2, J3 CONN,BNC,5 PINS CONNEX 112404
33 6 J4-J9 JACK BANANA KEYSTONE, 575-4
34 1 JP1 HEADER 4 PIN 0.079 DOUBLE ROW SULLINS, NRPN042PAEN-RC
35 1 JP6 HEADER 4 PIN 0.079 SINGLE ROW SULLINS, NRPN041PAEN-RC
36 3 JP2, JP3, JP4 HEADER 3 PIN 0.079 SINGLE ROW SULLINS, NRPN031PAEN-RC
37 1 JP5 HEADER 3 PIN 0.079 DOUBLE ROW SULLINS, NRPN032PAEN-RC
38 6 XJP1-XJP6 SHUNT, 0.079" CENTER SAMTEC, 2SN-BK-G
39 4 (STAND-OFF) STAND-OFF, NYLON 0.50" KEYSTONE, 8833(SNAP ON)

6
dc2157afc
DEMO MANUAL DC2157A
schematic Diagram
5
5
4
4
3
3
2
2
1
1
D D C C B B A A
VIN+
VIN-
VIN GND
4.5V - 15V
VOUT1
GND VO1+ VO1-
1.5V / 18A
1.0V / 18A
GND
VO2- VO2+
VOUT2
ON
TRACK1
CLKOUT
PHASE
120
90
60
o
o o
ON
EXT.
SOFT-START
TRACK1 SEL.
NOTE: UNLESS OTHERWISE SPECIFIED
1. ALL RESISTORS ARE IN OHMS, 0603. ALL CAPACITORS ARE 0603.
m
6.3V
6.3V
VOUT1
VIN INTVCC
VO1+
VO1-
INTVCC
VO1- VO1+
INTVCC
INTVCC
VOUT1
VO2+
VO2-
VIN
INTVCC
DIFFP
COMP1
VFB1
DIFFN
DIFFOUT
VOUT1S
VOUT1
TRACK1
RUN1
VO2+
VOUT2
VO2-
VOUT2S RUN2
TRACK2
VFB2
COMP2
INTVCC
TEMP
REVISION HISTORY DESCRIPTION DATEAPPROVEDECO REV
HAORAN W.
PRODUCTION
1 1-21-15
__
REVISION HISTORY DESCRIPTION DATEAPPROVEDECO REV
HAORAN W.
PRODUCTION
1 1-21-15
__
REVISION HISTORY DESCRIPTION DATEAPPROVEDECO REV
HAORAN W.
PRODUCTION
1 1-21-15
__
SIZE DATE:
IC NO. REV.
SHEET OF
TITLE:
APPROVALS
PCB DES.
APP ENG.
TECHNOLOGY Fax: [phone]
Milpitas, CA 95035 Phone: [phone] 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
1
Wednesday, January 21, 2015
12
HIGH EFFICIENCY, DUAL 18A STEP-DOWN MODULE REGULATOR
LT
HAORAN W.
N/A
LTM4630EY-1
DEMO CIRCUIT 2157A
SIZE DATE:
IC NO. REV.
SHEET OF
TITLE:
APPROVALS
PCB DES.
APP ENG.
TECHNOLOGY Fax: [phone]
Milpitas, CA 95035 Phone: [phone] 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
1
Wednesday, January 21, 2015
12
HIGH EFFICIENCY, DUAL 18A STEP-DOWN MODULE REGULATOR
LT
HAORAN W.
N/A
LTM4630EY-1
DEMO CIRCUIT 2157A
SIZE DATE:
IC NO. REV.
SHEET OF
TITLE:
APPROVALS
PCB DES.
APP ENG.
TECHNOLOGY Fax: [phone]
Milpitas, CA 95035 Phone: [phone] 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
1
Wednesday, January 21, 2015
12
HIGH EFFICIENCY, DUAL 18A STEP-DOWN MODULE REGULATOR
LT
HAORAN W.
N/A
LTM4630EY-1
DEMO CIRCUIT 2157A
E15
TEMP
E15
TEMP
JP3
OFF
RUN2
JP3
OFF
RUN2
13
2
J7J7
R16
OPT
R16
OPT
J6J6
E4E4
C10 100pF
25V
C10 100pF
25V
COUT3 OPT
1210
COUT3 OPT
1210
E7E7
C17 1nF
50V
C17 1nF
50V
R41 28K 1% R41 28K 1%
COUT6
OPT
1210
COUT6
OPT
1210
COUT2
OPT
1210
COUT2
OPT
1210
CIN4 22uF
1210 25V
CIN4 22uF
1210 25V
E1E1
R3
10
R3
10
J4J4
C5
0.1uF
C5
0.1uF
R19
90.9K
R19
90.9K
U1
LTM4630EY-1
U1
LTM4630EY-1
VIN J9
VIN J10
VIN J11
VIN K2
VIN K3
VIN K4
VIN K9
VIN K10
VIN K11
VIN
M2
VIN
M3
VIN
M4
VIN
M5
VIN
M6
VIN
M7
VIN
M8
VIN
M9
VIN
M10
VIN
M11
VIN L2
VIN L3
VIN L4
VIN L5
VIN L6
VIN L7
VIN L8
VIN L9
VIN
L10
VIN
L11
VIN J2
VIN J3
VIN J4
RUN1
F5
TRACK1
E5
VOUTS1
C5
VOUT1
A1
VOUT1
A2
VOUT1
A3
VOUT1
A4
VOUT1
A5
VFB1
D5
SW1
G2
PGOOD1
G9
COMP1
E6
DIFFOUT
F8
DIFFN
E9
DIFFP
E8
FSET
C6
PHASMD
G4
GND
A6
GND
A7
GND
B6
GND
B7
GND
D1
GND
D2
GND
D3
GND
D4
GND
D9
GND
D10
GND
D11
GND
D12
GND
E1
GND
E2
GND
E3
GND
E4
GND
E10
GND
E11
GND
E12
GND
F1
GND
F2
GND
F3
GND
F10
GND
F11
GND
F12
GND
G1
GND
G10
GND
G12
GND
H1
GND
H2
GND H3 GND H4 GND H5 GND H6 GND H7 GND H9 GND H10 GND H11 GND H12 GND J1 GND J5 GND J8 GND J12 GND K1 GND K5 GND K6 GND K7 GND K8 GND K12 GND L1 GND L12 GND M1 GND M12
SGND C7 SGND D6 SGND F6 SGND F7 SGND G6 SGND G7
VOUT1
B1
VOUT1
B2
VOUT1
B3
VOUT1
B4
VOUT1
B5
VOUT1
C1
VOUT1
C2
VOUT1
C3
VOUT1
C4
COMP2 E7
PGOOD2 G8
SW2 G11
VFB2 D7
TRACK2 D8
RUN2 F9
VOUTS2 C8
TEMP J6
MODE-PLLIN F4
CLKOUT G5
INTVCC H8
EXTVCC J7
VOUT2 A8
VOUT2 A9
VOUT2 A10
VOUT2 A11
VOUT2 A12
VOUT2 B8
VOUT2 B9
VOUT2 B10
VOUT2 B11
VOUT2 B12
VOUT2 C9
VOUT2 C10
VOUT2 C11
VOUT2 C12
GND
G3
J8J8
R30
121K
R30
121K
J5J5
JP1
EXT_CLK
PS
CCM
MODE
BM
JP1
EXT_CLK
PS
CCM
MODE
BM
1 3
2 4 65
7 8
R10 6.04K R10 6.04K
C3
OPT
C3
OPT C4
OPT
C4
OPT
+
COUT1
+
COUT1
E12 PGOOD2 E12 PGOOD2
C7
0.1uF
C7
0.1uF
+
COUT13
470uF 2.5V
+
COUT13
470uF 2.5V
+
COUT10
OPT
+
COUT10
OPT
R32
0
R32
0
R15
60.4K
R15
60.4K
+
COUT11
470uF 2.5V
+
COUT11
470uF 2.5V
CIN3 22uF
25V
1210 CIN3 22uF
25V
1210
E13
EXTVCC
E13
EXTVCC
C6
OPT
C6
OPT
R1 10 R1 10
R22 10 R22 10
C1
4.7uF
0805
C1
4.7uF
0805
COUT8
OPT 1210
COUT8
OPT 1210
R7 0 R7 0
E14
CLKOUT
E14
CLKOUT
COUT4
100uF
6.3V
1210
COUT4
100uF
6.3V
1210
R21 0 R21 0
CIN2 22uF
25V
1210
CIN2 22uF
25V
1210
E6E6
E8E8
R20
OPT
R20
OPT
C2
1uF
0805
C2
1uF
0805
J9J9
CIN5 22uF
25V
1210
CIN5 22uF
25V
1210
COUT12
OPT
1210
COUT12
OPT
1210
+
COUT7
+
COUT7
R27
10K
R27
10K
C18
470pF
50V C18
470pF
50V
JP5 TRACK2 SEL.
VOUT1
JP5 TRACK2 SEL.
VOUT1
1 3
2 4
5 6
R42
21.5K
1% R42
21.5K
1%
C12
OPT
C12
OPT
R24 10K R24 10K
R6 OPT R6 OPT
R2
OPT
R2
OPT
JP6JP6
1 3 2
4
C11
OPT
C11
OPT
R8
OPT
R8
OPT
R5
121K
R5
121K
JP2
OFF
RUN1
JP2
OFF
RUN1
1 3
2
E10 TRACK2 E10 TRACK2
R18 60.4K R18 60.4K
COUT14
OPT
1210
COUT14
OPT
1210
E9E9
+
CIN1
150uF 25V
+
CIN1
150uF 25V
+
COUT9
OPT
+
COUT9
OPT
R9
60.4K
R9
60.4K
JP4
SOFT-START
TRACK
JP4
SOFT-START
TRACK
1
3
2
R26
10
R26
10
C9
OPT
C9
OPT
E3
PGOOD1
E3
PGOOD1
C8
OPT
C8
OPT
R12
60.4K
R12
60.4K
TP1
SW1
TP1
SW1
R13
6.04K
R13
6.04K
COUT5
100uF
6.3V 1210
COUT5
100uF
6.3V 1210
E5E5
TP2 SW2 TP2 SW2
R29
0
R29
0
E16
CLKIN
E16
CLKIN
R4
OPT
R4
OPT
R25
40.2K
R25
40.2K

7
dc2157afc
DEMO MANUAL DC2157A
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
OPTIONAL JUMPER FOR 1 OUTPUT CONFIGURATION
DIFF SENSING SELECTION
VOUT1
m
LOAD TRANSIENT CIRCUIT
VOUT2
TEMP INTVCC
RUN1 RUN2
TRACK1 TRACK2
VFB1 VFB2
COMP1 COMP2
VO2- DIFFN VO2+ DIFFP
VOUT1S VOUT1 VOUT2S DIFFOUT
VOUT1 VOUT2
SIZE DATE:
IC NO. REV.
SHEET OF
TITLE:
APPROVALS
PCB DES.
APP ENG.
TECHNOLOGY Fax: [phone]
Milpitas, CA 95035 Phone: [phone] 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
1
Wednesday, January 21, 2015
22
HIGH EFFICIENCY, DUAL 18A STEP-DOWN MODULE REGULATOR
LT
HAORAN W.
N/A
LTM4630EY-1
DEMO CIRCUIT 2157A
SIZE DATE:
IC NO. REV.
SHEET OF
TITLE:
APPROVALS
PCB DES.
APP ENG.
TECHNOLOGY Fax: [phone]
Milpitas, CA 95035 Phone: [phone] 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
1
Wednesday, January 21, 2015
22
HIGH EFFICIENCY, DUAL 18A STEP-DOWN MODULE REGULATOR
LT
HAORAN W.
N/A
LTM4630EY-1
DEMO CIRCUIT 2157A
SIZE DATE:
IC NO. REV.
SHEET OF
TITLE:
APPROVALS
PCB DES.
APP ENG.
TECHNOLOGY Fax: [phone]
Milpitas, CA 95035 Phone: [phone] 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
1
Wednesday, January 21, 2015
22
HIGH EFFICIENCY, DUAL 18A STEP-DOWN MODULE REGULATOR
LT
HAORAN W.
N/A
LTM4630EY-1
DEMO CIRCUIT 2157A
E17
IOSTEP CLK
E17
IOSTEP CLK
R36 10K R36 10K
R39
OPT
R39
OPT
R23
OPT
R23
OPT
J3
IOSTEP
J3
IOSTEP
Q1 SUD50N04-8M8P-4GE3 Q1 SUD50N04-8M8P-4GE3
2
1
34
R35 OPT 2010 R35 OPT 2010
C13 1uF C13 1uF
R14
OPT
R14
OPT
J1J1
R11
OPT
R11
OPT
C14 1uF C14 1uF
E18
GND
E18
GND
R34
0 OHm
0.5W
2010
R34
0 OHm
0.5W
2010
R28
OPT
R28
OPT
R38
OPT
2512 R38
OPT
2512
R33
OPT
R33
OPT
R40
OPT
R40
OPT
C16
1uF
C16
1uF
R17
OPT
R17
OPT
R37 0.015 1W
2512
R37 0.015 1W
2512
J2J2
R31
OPT
R31
OPT
C15
1uF
C15
1uF

8
dc2157afc
DEMO MANUAL DC2157A
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
[phone] ●FAX: [phone] ●www.linear.com ©
LINEAR TECHNOLOGY CORPORATION 2014
LT 0715 REV C • PRINTED IN USA
DEMONSTRATION BOARD IMPORTANT NOTICE
Linear Technology Corporation (LT C ) 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 applica-
tion engineer.
Mailing Address:
Linear Technology
1630 McCarthy Blvd.
Milpitas, CA 95035
Copyright © 2004, Linear Technology Corporation

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