Linear Technology DC1663A Quick setup guide

dc1663af

DEMO MANUAL DC1663A

DESCRIPTION

LTM4628EV High Efﬁciency,

Dual 8A Step-Down Power

µModule Regulator

BOARD PHOTO

Demonstration circuit DC1663A features the LTM

4628EV,

the high efﬁciency, high density, dual 8A output, switch

mode step-down power module. The input voltage is

from 4.5V to 26.5V. The output voltage is programmable

from 0.6V to 5.5V. 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

MODE jumper (JP1) selects pulse-skipping mode for

noise sensitive applications or Burst Mode

operation

in less noise sensitive applications. The DC1663A sets

the LTM4628EV default switching frequency to 400kHz;

however the frequency is resistor programmable from

250kHz up to 780kHz. An internal phase-lock loop allows

the module to be synchronized to an external clock. The

board allows the user to program how its output ramps

up and down through the TRACK/SS pin. The output can

be set up to either coincidentally or ratio metrically track

with another supply’s output. Remote output voltage sens-

ing is available for improved output voltage regulation at

the load point. These features and the availability of the

LTM4628EV in a compact 15mm × 15mm × 4.32mm LGA

package make it ideal for use in many high density point

of load regulation applications. The LTM4628 datasheet

must be read in conjunction with this demo manual for

working on or modifying the demo circuit DC1663A.

Design ﬁles for this circuit board are available at

http://www.linear.com/demo

L, LT, LTC, LTM, Linear Technology, Burst Mode and the Linear logo are registered trademarks

of Linear Technology Corporation. All other trademarks are the property of their respective

owners.

dc1663af

DEMO MANUAL DC1663A

QUICK START PROCEDURE

PERFORMANCE SUMMARY

Demonstration circuit DC1663A is easy to set up to evalu-

ate the performance of the LTM4628EV. Please refer to

Figure 1 for proper measurement equipment setup and

the following the procedure:

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

60°

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 in channel 1 should be 1.5V ± 1.5% and the output

voltage in channel 2 should be 1.2V ± 1.5%.

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 SMA cables. 50Ω termination should

be set on the oscilloscope or SMA cables.

5. (Optional) For optional load transient test, apply an

adjustable pulse signal between IOSTEP CLK and GND

pins. Pulse amplitude (3V to 3.5V) sets the load step

current amplitude. The pulse signal should have very

small duty cycle (< 10%) to limit the thermal stress on

the transient load circuit. The output transient current

can be monitored at the SMA connector J3 (15mV/A).

Apply the jumper resistors R34 or R35 (on the back-

side of boards) to apply load transient on channel 1 or

channel 2 correspondingly.

6. (Optional) LTM4628 can be synchronized to an external

clock signal. Remove the jumper on JP1 and apply a clock

signal (0V to 5V, square wave) on the CLKIN test point.

7. (Optional) The outputs of LTM4628 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) LTM4628 can be conﬁgured for a 2-phase

single output at up to 16A on DC1663A. Refer to the

schematic for corresponding jumper resistor setup for

dual phase single output applications.

PARAMETER CONDITION VALUE

Input Voltage Range 4.5V to 26.5V

Output Voltage VOUT1 VIN = 4.5 to 26.5V, IOUT1 = 0A to 8A, JP1: CCM 1.5V ± 1.5% (1.4775V to 1.5225V)

Output Voltage VOUT2 VIN = 4.5 to 26.5V, IOUT2 = 0A to 8A, JP1: CCM 1.2V ± 1.5% (1.182V to 1.218V)

Per Channel Maximum Continuous Output Current Derating is Necessary for Certain VIN, VOUT and

Thermal Conditions, See Datasheet for Details.

Default Operating Frequency 400kHz

External Clock Synchronous Frequency Range 400kHz to 780kHz

Efﬁciency of Channel 1 VIN = 5V, VOUT1 = 1.5V, IOUT1 = 8A, fSW = 400 kHz 87.7% See Figure 2

Efﬁciency of Channel 2 VIN = 5V, VOUT2 = 1.2V, IOUT2 = 8A, fSW = 400 kHz 85.5% See Figure 3

Load Transient of Channel 1 VIN = 12V, VOUT1 = 1.5V, ISETP = 0A to 4A See Figure 4

Load Transient of Channel 2 VIN = 12V, VOUT2 = 1.2V, ISETP = 0A to 4A See Figure 5

(TA= 25°C)

dc1663af

DEMO MANUAL DC1663A

QUICK START PROCEDURE

Figure 1. Test Setup of DC1663A

–

+–

–

+ –

VIN

4.5V TO 26.5V

LOAD 0A TO 8A

+– A

LOAD 0A TO 8A

1663a F01

VOUT1

VOUT2

dc1663af

DEMO MANUAL DC1663A

QUICK START PROCEDURE

Figure 2. Measured Efﬁciency on Channel 1

(VOUT1 = 1.5V, fSW = 400kHz, Channel 2 Disabled)

Figure 4. Measured Channel 1 Load Transient

(VIN = 12V, VOUT1 = 1.5V)

Figure 3. Measured Efﬁciency on Channel 2

(VOUT2 = 1.2V, fSW = 400kHz, Channel 1 Disabled)

Figure 5. Measured Channel 2 Load Transient

(VIN = 12V, VOUT2 = 1.2V)

1663 F04

VOUT1

AC-COUPLED

20MHz BW

100mV/DIV

IOUT1

0A TO 4A STEP

3.3A/DIV

1663 F05

VOUT2

AC-COUPLED

20MHz BW

100mV/DIV

IOUT2

0A TO 4A STEP

3.3A/DIV

Figure 6. Measured Output Voltage Ripple at 12V Input, 1.5V and

1.2V Output, 8A Per Channel with Standard Demo Circuit Default Setup

LOAD CURRENT (A)

EFFICIENCY (%)

64 53

1663 F02

21 87

5VIN

9VIN

12VIN

15VIN

18VIN

LOAD CURRENT (A)

EFFICIENCY (%)

5 6 743

1663 F03

21 8

5VIN

9VIN

12VIN

15VIN

18VIN

1663 F06

1.5V OUTPUT

AC-COUPLED

20MHz BW

50mV/DIV

1.2V OUTPUT

AC-COUPLED

20MHz BW

50mV/DIV

dc1663af

DEMO MANUAL DC1663A

PARTS LIST

ITEM QUANTITY REFERENCE-DESCRIPTION DESCRIPTION MANUFACTURER’S PART NUMBER

Required Circuit Components

1 4 CIN2, CIN3, CIN4, CIN5 Cap., X5R, 10µF, 35V, 10%, 1210 Murata, GRM32ER6YA106KA12

2 2 COUT1, COUT7 Cap., 470µF, 4V, POSCAP, F8 Sanyo, 4TPE470MCL

3 2 COUT4, COUT5 Cap., X5R, 100µF, 6.3V, 20%, 1210 AVX, 12106D107MAT2A

4 2 C5, C7 Cap., X5R, 0.1µF, 25V, 10%, 0603 AVX, 06033D104KAT

5 4 R1, R3, R22, R26 Res., Chip, 10, 1%, 0603 NIC, NRC06F10R0TRF

6 1 R19 Res., Chip, 60.4k, 1%, 0603 Vishay, CRCW060360K4FKED

7 1 R25 Res., Chip, 40.2k, 1%, 0603 Vishay, CRCW060340K2FKED

8 1 R30 Res., Chip, 100k, 1%, 0603 Vishay, CRCW0603100KFKED

9 1 U1 IC, High Efﬁciency Step-Down Module Linear Technology LTM4628EV

Additional Demo Board Circuit Components

1 1 CIN1 Cap., 150µF, 35V, Aluminum Electr., Sun Electronics, 35CE150AX

2 0 COUT2, COUT3, COUT6, COUT8 Cap., X5R, 100µF, 6.3V, 20% 1210 Optional AVX, 12106D107MAT2A Optional

3 0 C1 Cap., X7R, 1µF, 25V,10%, 0805 Optional AVX, 08053C105KAT2A Optional

4 1 C2 Cap., X7R, 1µF, 25V,10%, 0805 AVX, 08053C105KAT2A

5 0 C3, C4, C6, C8 to C12 Cap., 0603, Optional Optional

6 0 R2, R4, R6, R8, R16, R20, R40 Res., 0603, Optional Optional

7 0 R11, R14, R17, R23, R28, R31,

R33, R39

Res., Chip, 0, 1%, 0603, Optional Vishay, CRCW06030000Z0ED, Optional

8 4 R5, R24, R27, R36 Res., Chip, 10k, 1%, 0603 Vishay, CRCW060310K0FKED

9 2 C13, C14 Cap., X7R, 0.01µF, 16V, 10%, 0603 AVX, 0603YC103KAT2A

10 2 C15, C16 Cap., X7R, 1µF, 10V, 10%, 0603 AVX, 0603ZC105KAT

11 4 R7, R21, R29, R32 Res., Chip, 0, 1%, 0603 Vishay, CRCW06030000Z0ED

12 4 R9, R10, R13, R15 Res., Chip, 60.4k, 1%, 0603 Vishay, CRCW060360K4FKED

13 1 R12 Res., Chip, 30.1k, 1%, 0603 Vishay, CRCW060330R1FKED

14 1 R18 Res., Chip, 90.9k, 1%, 0603 Vishay, CRCW060390K9FKED

15 1 R34 Res., Chip, 0.001Ω, 0.5W, 2010 Vishay, WSL20101L000FEA

16 0 R35 Res., 2010, Optional Optional

17 1 R37 Res., Chip, 0.015Ω, 2W, 2512 Vishay, WSL2512R0150FEA

18 0 R38 Res., 2512, Optional Optional

19 1 Q1 N-Channel 30-V MOSFET Vishay, SUD50N03-09P

20 10 TP1 to TP5, TP10 to TP15 Testpoint, Turret, .094" pbf Mill-Max, 2501-2-00-80-00-00-07-0

21 4 TP18, TP20, TP22, TP23 Testpoint, Turret, .094" pbf Mill-Max, 2501-2-00-80-00-00-07-0

22 6 TP6, TP7, TP8, TP9, TP17, TP19 Jack Banana Keystone, 575-4

Hardware - for Demo Board Only

1 2 JP1, JP6 Header 4 Pin 0.079 Single Row Samtec, TMM104-02-L-S

2 3 JP2, JP3, JP4 Header 3 Pin 0.079 Single Row Samtec, TMM103-02-L-S

3 1 J5 Header 3 Pin 0.079 Double Row Samtec, TMM-103-02-L-D

4 6 XJP1 to XJP6 Shunt, .079" Center Samtec, 2SN-BK-G

5 3 J1, J2, J3 CON., SMA , PCB, Jack Amphenol Connex, 132134

6 4 Stand-Off Stand-Off, Nylon 0.50" Keystone, 8833 (Snap On)

dc1663af

DEMO MANUAL DC1663A

SCHEMATIC DIAGRAMS

D D

B B

A A

VIN+

VIN-

VIN

GND

4.5V-26.5V

VOUT1

GND

VO1+

VO1-

1.5V @ 8A

1.2V @ 8A

GND

VO2-

VO2+

VOUT2

MODE

CCM

TRACK1

EXT.

SOFT-START

TRACK1 SEL.

NOTE: UNLESS OTHERWISE SPECIFIED

1. ALL RESISTORS AREIN 0603.

ALL CAPACITORS AREIN0603.

CLKOUT

PHASE

120

VOUT1

VIN INTVCC

INTVCC

VO1+

VO1-

INTVCC

VO1-

VO1+

INTVCC

VOUT1

VO2+

VO2-

VIN

INTVCC

DIFFP

COMP1

DIFFN

DIFFOUT

VOUT1S

VOUT1

TRACK1

RUN1

VO2+

VOUT2

VO2-

VOUT2S

TRACK2

VFB2

COMP2

INTVCC

TEMP

RUN2

VFB1

REVISION HISTORY

DESCRIPTION DATEAPPROVEDECO REV

JEFF ZPRODUCTION1 06-01-10

REVISION HISTORY

DESCRIPTION DATEAPPROVEDECO REV

JEFF ZPRODUCTION1 06-01-10

REVISION HISTORY

DESCRIPTION DATEAPPROVEDECO REV

JEFF ZPRODUCTION1 06-01-10

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 Condential-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 T O

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 AN D

SCHEMATIC

SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.

SCALE = NONE

www.linear.com

Tuesday, September 07, 2010

1 2

HIGH EFFICIENCY, DUAL 8A STEP-DOWN uMODULE REGULATOR

JEFF Z.

N/A

LTM4628EV

DEMO CIRCUIT 1663A

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 Condential-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 T O

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 AN D

SCHEMATIC

SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.

SCALE = NONE

www.linear.com

Tuesday, September 07, 2010

1 2

HIGH EFFICIENCY, DUAL 8A STEP-DOWN uMODULE REGULATOR

JEFF Z.

N/A

LTM4628EV

DEMO CIRCUIT 1663A

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 Condential-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 T O

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 AN D

SCHEMATIC

SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.

SCALE = NONE

www.linear.com

Tuesday, September 07, 2010

1 2

HIGH EFFICIENCY, DUAL 8A STEP-DOWN uMODULE REGULATOR

JEFF Z.

N/A

LTM4628EV

DEMO CIRCUIT 1663A

JP1JP1

TP5TP5

TP17TP17

R16

OPT

R16

OPT

TP19TP19

JP3

OFF

RUN2

JP3

OFF

RUN2

TP11

TEMP

TP11

TEMP

TP20TP20

COUT3

OPT

1210

COUT3

OPT

1210

C10

OPT

C10

OPT

R19

60.4K

R19

60.4K

0.1uF

TP6TP6

TP13TP13

CIN4

10uF

1210

35V

CIN4

10uF

1210

35V

COUT2

OPT

1210

COUT2

OPT

1210

COUT6

OPT

1210

COUT6

OPT

1210

COUT1

470uF

COUT1

470uF

OPT

R10

60.4K

R10

60.4K

TP8TP8

R30

100K

R30

100K

TP7TP7

OPT

JP5

VOUT1

TRACK2 SEL.

JP5

VOUT1

TRACK2 SEL.

0.1uF

TP18 PGOOD2

LTM4628EV

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

VOUTS1

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

RUN2F9

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

TP2

EXTVCC

TP2

EXTVCC

CIN3

10uF

35V

1210

CIN3

10uF

35V

1210

R15

60.4K

R15

60.4K

R32

OPT

TP15TP15

CIN2

10uF

35V

1210

CIN2

10uF

35V

1210

R21

COUT4

100uF

6.3V

1210

COUT4

100uF

6.3V

1210

TP1

CLKOUT

TP1

CLKOUT

COUT8

OPT

1210

COUT8

OPT

1210

OPT

R22

TP9TP9

1uF

R20

OPT

R20

OPT

TP3TP3

OPT

R24

10K

R24

10K

C12

OPT

C12

OPT

R27

10K

R27

10K

COUT7

470uF

COUT7

470uF

CIN5

10uF

35V

1210

CIN5

10uF

35V

1210

JP2

OFF

RUN1

JP2

OFF

RUN1

10K

TP4

CLKIN

TP4

CLKIN

OPT

C11

OPT

C11

OPT

JP6JP6

R18

90.9K

R18

90.9K

TP14 TRACK2

60.4K

CIN1

150uF

35V

CIN1

150uF

35V

TP12TP12

TP21

SW1

TP21

SW1

R12

30.1K

R12

30.1K

OPT

TP22

PGOOD1 TP22

PGOOD1

R26

JP4

SOFT-START

TRACK

JP4

SOFT-START

TRACK

TP10TP10

COUT5

100uF

6.3V

1210

COUT5

100uF

6.3V

1210

R13

60.4K

R13

60.4K

R29

TP16 SW2

R25

40.2K

R25

40.2K

OPT

dc1663af

DEMO MANUAL DC1663A

SCHEMATIC DIAGRAMS

OPTIONAL JUMPER FOR 1 OUTPUT CONFIGURATION

DIFF SENSING SELECTION

VOUT1

LOAD TRANSIENT CIRCUIT

VOUT2

TEMP INTVCC

RUN1RUN2

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 Condential-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 T O

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 AN D

SCHEMATIC

SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.

SCALE = NONE

www.linear.com

Tuesday, September 07, 2010

2 2

HIGH EFFICIENCY, DUAL 8A STEP-DOWN uMODULE REGULATOR

JEFF Z.

N/A

LTM4628EV

DEMO CIRCUIT 1663A

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 Condential-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 T O

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 AN D

SCHEMATIC

SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.

SCALE = NONE

www.linear.com

Tuesday, September 07, 2010

2 2

HIGH EFFICIENCY, DUAL 8A STEP-DOWN uMODULE REGULATOR

JEFF Z.

N/A

LTM4628EV

DEMO CIRCUIT 1663A

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 Condential-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 T O

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 AN D

SCHEMATIC

SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.

SCALE = NONE

www.linear.com

Tuesday, September 07, 2010

2 2

HIGH EFFICIENCY, DUAL 8A STEP-DOWN uMODULE REGULATOR

JEFF Z.

N/A

LTM4628EV

DEMO CIRCUIT 1663A

R36

10K

R36

10K

TP23

IOSTEP CLK

TP23

IOSTEP CLK

IOSTEP

R23

OPT

R23

OPT

R39

OPT

R39

OPT

C13

0.01uF

C13

0.01uF

R35

OPT

2010

R35

OPT

2010

SUD50N03-09P

R14

OPT

R14

OPT

J1J1 C14

0.01uF

C14

0.01uF

R11

OPT

R11

OPT

R34

1mOHm

0.5W

2010

R34

1mOHm

0.5W

2010

R28

OPT

R28

OPT

R38

OPT

2512

R38

OPT

2512

R33

OPT

R33

OPT

R17

OPT

R17

OPT

C16

1uF

C16

1uF

R40

OPT

R40

OPT

C15

1uF

C15

1uF

R31

OPT

R31

OPT

J2J2

R37

0.015

2512

R37

0.015

2512

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.

dc1663af

DEMO MANUAL DC1663A

Linear Technology Corporation

1630 McCarthy Blvd., Milpitas, CA 95035-7417

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

 LINEAR TECHNOLOGY CORPORATION 2010

LT 0910 • 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 direc-

tive 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

X-ON Electronics

Largest Supplier of Electrical and Electronic Components

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Click to view products by Analog Devices manufacturer:

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