Linear Technology DC1759A Quick setup guide

1
dc1759af
DEMO MANUAL DC1759A
DESCRIPTION
LTM4620A
High Efficiency, Dual 13A Step-Down
Power µModule Regulator
Demonstration circuit 1759A features the LTM
®
4620AEV,
the high efficiency, high density, dual 13A, switch mode
step-down power module regulator. The input voltage is
from 5.5V to 16V. The output voltage is programmable
from 0.6V to 5V. DC1759A can deliver 13A maximum
current from each channel. 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 effi-
ciencyatlowloadcurrents,theMODEjumper(JP1)selects
pulse-skipping mode for noise sensitive applications or
Burst Mode
®
operation in less noise sensitive applications.
Two outputs can be connected in parallel for a single 26A
output solution with optional jumper resistors. The board
allows the user to program how its output ramps up and
L, LT, LTC, LTM, Linear Technology, the Linear logo and Burst Mode are registered trademarks
of Linear Technology Corporation. All other trademarks are the property of their respective
owners.
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
LTM4620AEV in a compact 15mm ×15mm ×4.41mm
LGA package make it ideal for use in many high density
point-of-load regulation applications. The LTM4620A data
sheet must be read in conjunction with this demo manual
for working on or modifying the demo circuit 1759A.
Design files for this circuit board are available at
http://www.linear.com/demo
Figure 1. LTM4620A/DC1759A Demo Board
Specifications are at TA= 25°C

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dc1759af
DEMO MANUAL DC1759A
QUICK START PROCEDURE
Demonstration circuit 1759A is easy to set up to evalu-
ate the performance of the LTM4620AEV. Please refer to
Figure 2 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 2. 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 3.3V ±1.5% (3.2505V
~ 3.3495V) and the output voltage in channel 2 should
be 5V ±1.5% (4.925V ~ 5.075V).
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
(<1%) 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) LTM4620A can be synchronizedto an external
clock signal. Place the JP1 jumper on EXT_CLK and
apply a clock signal (0V ~ 5V, square wave) on the
CLKIN test point.
7. (Optional) The outputs of LTM4620A 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) LTM4620A can be configured for a 2-phase
single output at up to 26A on DC1759A. 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).
PERFORMANCE SUMMARY
PARAMETER CONDITION VALUE
Input Voltage Range 5.5V ~ 16V
Output Voltage VOUT1 VIN = 5.5V ~ 16V, IOUT1 = 0A ~ 13A, JP1: CCM 3.3V ±1.5%
Output Voltage VOUT2 VIN = 5.5V ~16V, IOUT2 = 0A ~ 13A, JP1: CCM 5V ±1.5%
Per-Channel Maximum Continuous Output Current Derating is Necessary for Certain VIN, VOUT and Thermal Conditions,
See Data Sheet for Detail.
13A (per-Channel)
Default Operating Frequency 750kHz
Resistor Programmable Frequency Range 250kHz to 780kHz
External Clock Sync. Frequency Range 400kHz to 780kHz
Efficiency of Channel 1 VIN = 12V, VOUT1 = 3.3V, IOUT1 = 13A, fSW = 750kHz 91.7% See Figure 3
Efficiency of Channel 2 VIN = 12V, VOUT2 = 5V, IOUT2 = 13A, fSW = 750kHz 93.8% See Figure 4
Load Transient of Channel 1 VIN = 12V, VOUT1 = 3.3V, ISETP = 6.5A ~ 13A See Figure 5
Load Transient of Channel 2 VIN = 12V, VOUT2 = 5V, ISETP = 6.5A ~ 13A See Figure 6
(TA= 25°C)

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dc1759af
DEMO MANUAL DC1759A
QUICK START PROCEDURE
Figure 2. Test Setup of DC1759A
Figure 3. Measured Efficiency on Channel 1
(VOUT1 = 3.3V, fSW = 750kHz, Channel 2 Disabled)
Figure 4. Measured Efficiency on Channel 2
(VOUT2 = 5V, fSW = 750kHz, Channel 1 Disabled)
LOAD CURRENT (A)
0
EFFICIENCY (%)
100
90
80
95
85
75 482610
dc1759a F03
13123715911
VIN = 5.5V, VOUT1 = 3.3V
VIN = 12V, VOUT1 = 3.3V
VIN = 16V, VOUT1 = 3.3V
LOAD CURRENT (A)
0
EFFICIENCY (%)
100
90
80
95
85
75 482610
dc1759a F04
13123715911
VIN = 5.5V, VOUT2 = 5V
VIN = 12V, VOUT2 = 5V
VIN = 16V, VOUT2 = 5V

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dc1759af
DEMO MANUAL DC1759A
dc1759a F06
5V OUTPUT (20MHz BW) [100mV/DIV]
6.5A TO 13A LOAD
QUICK START PROCEDURE
Figure 5. Measured Channel 1 6.5A to 13A Load Transient (VIN = 12V, VOUT1 = 3.3V)
Figure 6. Measured Channel 2 6.5A to 13A Load Transient (VIN = 12V, VOUT2 = 5V)
dc1759a F05
3.3V OUTPUT (20MHz BW) [100mV/DIV]
6.5A TO 13A LOAD

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dc1759af
DEMO MANUAL DC1759A
dc1759a F07
3.3V OUTPUT (20MHz BW) [20mV/DIV]
QUICK START PROCEDURE
Figure 7. Measured Output Voltage Ripple at 12V Input, 3.3V/13A Output with Standard Demo Circuit Default Setup
Figure 8. Measured Output Voltage Ripple at 12V Input, 5V/13A Output with Standard Demo Circuit Default Setup
dc1759a F08
5V OUTPUT (20MHz BW) [20mV/DIV]

6
dc1759af
DEMO MANUAL DC1759A
QUICK START PROCEDURE
Figure 9. Thermal Capture at 12VIN, 3.3VOUT at 13A and 5VOUT at 13A
(Ambient Temperature = 23°C, 200LFM Airflow and No Heat Sink)

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dc1759af
DEMO MANUAL DC1759A
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 3 CIN2, CIN3, CIN4, CIN5 Cap., X5R, 22μF, 25V, 10%, 1210 MURATA, GRM32ER61E226KE15
3 2 COUT1, COUT7 Cap., 330μF, 6.3V, POSCAP 7343 SANYO, 6TPF330M9L
4 2 COUT4, COUT5 Cap., X5R, 100μF, 6.3V, 20% 1210 AVX, 12106D107MAT2A
5 1 C2 Cap., X7R, 1μF, 25V, 10%, 0805 AVX, 08053C105KAT2A
6 2 C5, C7 Cap., X5R, 0.1μF, 25V, 10%, 0603 AVX, 06033D104KAT
7 1 C6 Cap., 33pF, 10V, 10%, 0603 AVX, 0603ZC330KAT2A
8 1 C9 Cap., 47pF, 10V, 10%, 0603 AVX, 0603ZC470KAT2A
9 4 C13, C14, C15, C16 Cap., X7R, 1μF, 10V, 10%, 0603 AVX, 0603ZC105KAT
10 1 Q1 N-Channel 30-V Mosfet VISHAY, SUD50N03-09P
11 4 R1, R3, R22, R26 Res., Chip, 10Ω, 1%, 0603 NIC, NRC06F10R0TRF
12 4 R5, R24, R27, R36 Res., Chip, 10k, 1%, 0603 YAGEO, RC0603FR-0710KL
13 4 R7, R21, R29, R32 Res., Chip, 0Ω, 1%, 0603 VISHAY, CRCW06030000Z0ED
14 4 R9, R12, R15, R18 Res., Chip, 60.4k, 1%, 0603 VISHAY, CRCW060360K4FKED
15 2 R10, R13 Res., Chip, 6.04k, 1%, 0603 YAGEO, RC060FR-0760K4L
16 1 R19 Res., Chip, 8.25k, 1%, 0603 VISHAY, CRCW06038K25FKED
17 1 R25 Res., Chip, 13.3k, 1%, 0603 VISHAY, CRCW060313K3FKED
18 1 R30 Res., Chip, 191k, 1%, 0603 VISHAY, CRCW0603191KFKED
19 1 R34 Res., Chip, 0Ω, 0.5W, 2010 TEPRO, RN6083
20 1 R37 Res., Chip, 0.015Ω, 2W, 2512 VISHAY, WSL2512R0150FEA
21 1 U1 LTM4620AEV 15X15X4.41-LGA LINEAR TECH., LTM4620AEV
Additional Circuits
22 0 COUT2, COUT3, COUT6, COUT8, OPT 1210 OPT
23 0 C1 OPT 0805 OPT
24 0 C3, C4, C8, C10, C11, C12 OPT 0603 OPT
25 0 R2, R4, R6, R8, R11, R14, R16, R17, R20, R23,
R28, R31, R33, R39, R40
OPT 0603 OPT
26 0 R35 OPT 2010 OPT
27 0 R38 OPT 2512 OPT
Hardware/Components (For Demo Board Only)
28 16 E1, E3-E10, E12-E18 TESTPOINT, TURRET, 0.094" MILL-MAX, 2501-2-00-80-00-00-07-0
29 3 J1, J2, J3 CONN, BNC, 5 PINS CONNEX 112404
30 6 J4-J9 CONN, BANANA JACK, KEYSTONE-575-4 KEYSTONE 575-4
31 1 JP1 HEADER 4 PIN 0.079 DOUBLE ROW SAMTEC, TMM104-02-L-D
32 1 JP6 HEADER 4 PIN 0.079 SINGLE ROW SAMTEC, TMM104-02-L-S
33 3 JP2, JP3, JP4 HEADER 3 PIN 0.079 SINGLE ROW SAMTEC, TMM103-02-L-S
34 1 JP5 HEADER 3 PIN 0.079 DOUBLE ROW SAMTEC, TMM-103-02-L-D
35 4 MTGS at 4 corners STAND-OFF, NYLON 0.50" KEYSTONE, 8833(SNAP-ON)
36 6 XJP1-XJP6 SHUNT, 0.079" CENTER SAMTEC, 2SN-BK-G

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dc1759af
DEMO MANUAL DC1759A
5 5
4 4
3 3
2 2
1 1
D D C C B B A A
VIN+
VIN-
VIN GND
5.5V-16V
VOUT1
GND VO1+ VO1-
3.3V / 13A
5V / 13A 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 IN MICROFARADS, 0603.
T
TT T
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
INTVCCTEMP
REVISION HISTORY DESCRIPTION DATEAPPROVEDECO REV
PRODUCTION2 11-15-12
__
JIAN L.
REVISION HISTORY DESCRIPTION DATEAPPROVEDECO REV
PRODUCTION2 11-15-12
__
JIAN L.
REVISION HISTORY DESCRIPTION DATEAPPROVEDECO REV
PRODUCTION2 11-15-12
__
JIAN L.
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
2
Thursday, November 15, 2012
12
HIGH EFFICIENCY, DUAL 13A STEP-DOWN MODULE REGULATOR
LT
JIAN L.
N/A
LTM4620AEV
DEMO CIRCUIT 1759A
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
2
Thursday, November 15, 2012
12
HIGH EFFICIENCY, DUAL 13A STEP-DOWN MODULE REGULATOR
LT
JIAN L.
N/A
LTM4620AEV
DEMO CIRCUIT 1759A
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
2
Thursday, November 15, 2012
12
HIGH EFFICIENCY, DUAL 13A STEP-DOWN MODULE REGULATOR
LT
JIAN L.
N/A
LTM4620AEV
DEMO CIRCUIT 1759A
E4E4
J6J6
R16
OPT
R16
OPT
J7J7
JP3
OFF
RUN2
JP3
OFF
RUN2
13
2
E15
TEMP
E15
TEMP
E7E7
COUT3 OPT COUT3 OPT
C10
OPT
C10
OPT
R19
8.25K
R19
8.25K
C5
0.1uF
C5
0.1uF
R3 10 R3 10
J4J4
E1E1
CIN4 22uF
1210 25V
CIN4 22uF
1210 25V COUT2
OPT COUT2 OPT
COUT6
OPT
COUT6
OPT
+
COUT1
330uF 6.3V
+
COUT1
330uF 6.3V
C4
OPT
C4
OPT
C3
OPT
C3
OPT
R10 6.04K R10 6.04K
JP1
EXT_CLK
PS
CCM
MODE
BM
JP1
EXT_CLK
PS
CCM
MODE
BM
1 3
2 4 65
7 8
J5J5
R30 191K R30 191K
J8J8
U1
LTM4620AEV
U1
LTM4620AEV
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
VOUT1S
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
VOUT2S 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
JP5
VOUT1
TRACK2 SEL. JP5
VOUT1
TRACK2 SEL.
1 3
2 4
5 6
C7
0.1uF
C7
0.1uF
E12 PGOOD2 E12 PGOOD2
E13
EXTVCC
E13
EXTVCC
CIN3 22uF
25V
1210 CIN3 22uF
25V
1210
R15 60.4K R15 60.4K
R32
0
R32
0
R1 10 R1 10
C6
33pF
C6
33pF
E6E6
CIN2 22uF
25V
1210
CIN2 22uF
25V
1210
R21
0
R21
0
COUT4 100uF
6.3V
COUT4 100uF
6.3V
E14
CLKOUT
E14
CLKOUT
R7 0 R7 0
COUT8
OPT
COUT8
OPT
C1
OPT
C1
OPT
R22 10 R22 10
J9J9
C2
1uF
C2
1uF
R20 OPT R20 OPT
E8E8
R2
OPT
R2
OPT
R6 OPT R6 OPT
R24 10K R24 10K
C12
OPT
C12
OPT
R27
10K
R27
10K
+
COUT7
330uF
6.3V
+
COUT7
330uF
6.3V
CIN5 22uF
25V
1210
CIN5 22uF
25V
1210
JP2
OFF
RUN1
JP2
OFF
RUN1
1 3
2
R5
10K
R5
10K
R8
OPT
R8
OPT
C11
OPT
C11
OPT
JP6JP6
1 3 2
4
R18 60.4K R18 60.4K
E10
TRACK2
E10
TRACK2
R9
60.4K
R9
60.4K
+
CIN1
150uF 25V
+
CIN1
150uF 25V
E9E9
TP1
SW1
TP1
SW1
R12
60.4K
R12
60.4K
C8
OPT
C8
OPT
E3
PGOOD1
E3
PGOOD1
C9
47pF
C9
47pF
R26
10
R26
10
JP4
SOFT-START
TRACK
JP4
SOFT-START
TRACK
1
3
2
E5E5
COUT5
100uF
6.3V
COUT5
100uF
6.3V
R13 6.04K R13 6.04K
E16
CLKIN
E16
CLKIN
R29
0
R29
0
TP2
SW2
TP2
SW2
R25
13.3K
R25
13.3K
R4
OPT
R4
OPT
SCHEMATIC DIAGRAM

9
dc1759af
DEMO MANUAL DC1759A
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
T
TT T
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
2
Thursday, November 15, 2012
22
HIGH EFFICIENCY, DUAL 13A STEP-DOWN MODULE REGULATOR
LT
JIAN L.
N/A
LTM4620AEV
DEMO CIRCUIT 1759A
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
2
Thursday, November 15, 2012
22
HIGH EFFICIENCY, DUAL 13A STEP-DOWN MODULE REGULATOR
LT
JIAN L.
N/A
LTM4620AEV
DEMO CIRCUIT 1759A
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
2
Thursday, November 15, 2012
22
HIGH EFFICIENCY, DUAL 13A STEP-DOWN MODULE REGULATOR
LT
JIAN L.
N/A
LTM4620AEV
DEMO CIRCUIT 1759A
E17
IOSTEP CLK
E17
IOSTEP CLK
R36
10K
R36
10K
R39
OPT
R39
OPT
R23
OPT
R23
OPT
J3
IOSTEP
J3
IOSTEP
Q1 SUD50N03-09P Q1 SUD50N03-09P
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 2W 2512
R37
0.015 2W 2512
J2J2
R31
OPT
R31
OPT
C15 1uF C15 1uF

10
dc1759af
DEMO MANUAL DC1759A
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
[phone] ●FAX: [phone] ●www.linear.com
© LINEAR TECHNOLOGY CORPORATION 2013
LT 0113 • 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 applica-
tion engineer.
Mailing Address:
Linear Technology
1630 McCarthy Blvd.
Milpitas, CA 95035
Copyright © 2004, Linear Technology Corporation

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