Linear Technology DC1759A Quick setup guide

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

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)

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)

EFFICIENCY (%)

100

75 482610

dc1759a F03

13123715911

VIN = 5.5V, VOUT1 = 3.3V

VIN = 12V, VOUT1 = 3.3V

VIN = 16V, VOUT1 = 3.3V

LOAD CURRENT (A)

EFFICIENCY (%)

100

75 482610

dc1759a F04

13123715911

VIN = 5.5V, VOUT2 = 5V

VIN = 12V, VOUT2 = 5V

VIN = 16V, VOUT2 = 5V

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

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]

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)

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

dc1759af

DEMO MANUAL DC1759A

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

TRACK1

CLKOUT

PHASE

120

EXT.

SOFT-START

TRACK1 SEL.

NOTE: UNLESS OTHERWISE SPECIFIED

1. ALL RESISTORS ARE IN OHMS, 0603.

ALL CAPACITORS ARE IN MICROFARADS, 0603.

VOUT1

VIN INTVCC

VO1+

VO1-

INTVCC

VO1-

VO1+

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: (408)434-0507

Milpitas, CA 95035

Phone: (408)432-1900

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

Thursday, November 15, 2012

HIGH EFFICIENCY, DUAL 13A STEP-DOWN MODULE REGULATOR

JIAN L.

N/A

LTM4620AEV

DEMO CIRCUIT 1759A

SIZE

DATE:

IC NO. REV.

SHEET OF

TITLE:

APPROVALS

PCB DES.

APP ENG.

TECHNOLOGY Fax: (408)434-0507

Milpitas, CA 95035

Phone: (408)432-1900

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

Thursday, November 15, 2012

HIGH EFFICIENCY, DUAL 13A STEP-DOWN MODULE REGULATOR

JIAN L.

N/A

LTM4620AEV

DEMO CIRCUIT 1759A

SIZE

DATE:

IC NO. REV.

SHEET OF

TITLE:

APPROVALS

PCB DES.

APP ENG.

TECHNOLOGY Fax: (408)434-0507

Milpitas, CA 95035

Phone: (408)432-1900

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

Thursday, November 15, 2012

HIGH EFFICIENCY, DUAL 13A STEP-DOWN MODULE REGULATOR

JIAN L.

N/A

LTM4620AEV

DEMO CIRCUIT 1759A

E4E4

J6J6

R16

OPT

R16

OPT

J7J7

JP3

OFF

RUN2

JP3

OFF

RUN2

E15

TEMP

E15

TEMP

E7E7

COUT3

OPT

COUT3

OPT

C10

OPT

C10

OPT

R19

8.25K

R19

8.25K

0.1uF

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

OPT

R10

6.04K

R10

6.04K

JP1

EXT_CLK

CCM

MODE

JP1

EXT_CLK

CCM

MODE

7 8

J5J5

R30

191K

R30

191K

J8J8

LTM4620AEV

VIN J9

VIN J10

VIN J11

VIN K2

VIN K3

VIN K4

VIN K9

VIN K10

VIN K11

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

TRACK1

VOUT1S

VOUT1

VFB1

SW1

PGOOD1

COMP1

DIFFOUT

DIFFN

DIFFP

FSET

PHASMD

GND

D10

GND

D11

GND

D12

GND

E10

GND

E11

GND

E12

GND

F10

GND

F11

GND

F12

GND

G10

GND

G12

GND

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

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

JP5

VOUT1

TRACK2 SEL.

JP5

VOUT1

TRACK2 SEL.

5 6

0.1uF

E12 PGOOD2

E13

EXTVCC

E13

EXTVCC

CIN3

22uF

25V

1210

CIN3

22uF

25V

1210

R15

60.4K

R15

60.4K

R32

33pF

E6E6

CIN2

22uF

25V

1210

CIN2

22uF

25V

1210

R21

COUT4

100uF

6.3V

COUT4

100uF

6.3V

E14

CLKOUT

E14

CLKOUT

COUT8

OPT

COUT8

OPT

R22

J9J9

1uF

R20

OPT

R20

OPT

E8E8

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

10K

OPT

C11

OPT

C11

OPT

JP6JP6

R18

60.4K

R18

60.4K

E10

TRACK2

E10

TRACK2

60.4K

CIN1

150uF

25V

CIN1

150uF

25V

E9E9

TP1

SW1

TP1

SW1

R12

60.4K

R12

60.4K

OPT

PGOOD1

47pF

R26

JP4

SOFT-START

TRACK

JP4

SOFT-START

TRACK

E5E5

COUT5

100uF

6.3V

COUT5

100uF

6.3V

R13

6.04K

R13

6.04K

E16

CLKIN

E16

CLKIN

R29

TP2

SW2

TP2

SW2

R25

13.3K

R25

13.3K

OPT

SCHEMATIC DIAGRAM

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

D D

C C

B B

A A

OPTIONAL JUMPER FOR 1 OUTPUT CONFIGURATION

DIFF SENSING SELECTION

VOUT1

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: (408)434-0507

Milpitas, CA 95035

Phone: (408)432-1900

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

Thursday, November 15, 2012

HIGH EFFICIENCY, DUAL 13A STEP-DOWN MODULE REGULATOR

JIAN L.

N/A

LTM4620AEV

DEMO CIRCUIT 1759A

SIZE

DATE:

IC NO. REV.

SHEET OF

TITLE:

APPROVALS

PCB DES.

APP ENG.

TECHNOLOGY

Fax: (408)434-0507

Milpitas, CA 95035

Phone: (408)432-1900

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

Thursday, November 15, 2012

HIGH EFFICIENCY, DUAL 13A STEP-DOWN MODULE REGULATOR

JIAN L.

N/A

LTM4620AEV

DEMO CIRCUIT 1759A

SIZE

DATE:

IC NO. REV.

SHEET OF

TITLE:

APPROVALS

PCB DES.

APP ENG.

TECHNOLOGY

Fax: (408)434-0507

Milpitas, CA 95035

Phone: (408)432-1900

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

Thursday, November 15, 2012

HIGH EFFICIENCY, DUAL 13A STEP-DOWN MODULE REGULATOR

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

IOSTEP

SUD50N03-09P

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

2512

R37

0.015

2512

J2J2

R31

OPT

R31

OPT

C15

1uF

C15

1uF

dc1759af

DEMO MANUAL DC1759A

Linear Technology Corporation

1630 McCarthy Blvd., Milpitas, CA 95035-7417

(408) 432-1900 ●FAX: (408) 434-0507 ●www.linear.com

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

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