Linear Technology DC1626A Guide de configuration rapide

dc1626afa

DEMO MANUAL DC1626A

DESCRIPTION

LTC3838EFE

Wide Input Range, High Efficiency

Step-Down DC/DC Converter

Demonstration circuit 1626A is a dual output 1.5V/15A

and 1.2V/15A synchronous buck converter operating with

a switching frequency of 300kHz over an input voltage

range of 4.5V to 26V. The demo board comes in two ver-

sions. The -A version uses inductor DCR current sensing

with an iron powder inductor for high efficiency. The -B

version uses a 2.5mΩ sense resistor for accurate current

sensing with a low DCR ferrite inductor. The fixed on-time

valley current mode architecture of the LTC3838 allows for

a fast load step response (see Figures 6 to 9). The load

step response can be tested with the on-board load step

circuit and a bench pulse generator.

The demo board uses a high density, two sided drop-in

layout. The entire converter, excluding the bulk output and

input capacitors, fits within a compact 1.5" ×1.0" area

on the board. The package style for the LTC3838EFE is a

38-lead TSSOP with an exposed ground pad.

L, LT, LTC, LTM, μModule, Linear Technology and the Linear logo are registered trademarks of

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

PERFORMANCE SUMMARY

The main features of the board are listed below:

• MODE jumper to program either DCM or FCM at light

or no load

• EXTVCC pin

• PLLIN pin to synchronize the converter to an external

clock

• Remote sensing for VOUT1

• Optional resistors to tie the two phases together

• Each rail has its own RUN pin, PGOOD pin and

TRACK/SS pin

Design files for this circuit board are available at

http://www.linear.com/demo

(TA= 25°C)

PARAMETER CONDITION VALUE

Minimum Input Voltage 4.5V

Maximum Input Voltage 26V

Output Voltage VOUT1 IOUT1 = 0A to 15A, VIN = 4.5V to 26V 1.2V ±2%

Output Voltage VOUT2 IOUT2 = 0A to 15A, VIN = 4.5V to 26V 1.5V ±2%

VOUT1 Maximum Output Current, IOUT1 VIN = 4.5V to 26V, VOUT1 = 1.2V 15A

VOUT2 Maximum Output Current, IOUT2 VIN = 4.5V to 26V, VOUT2 = 1.5V 15A

Nominal Switching Frequency 300kHz

-A Efficiency

See Figures 2 and 3

VOUT1 = 1.2V, IOUT1 = 15A, VIN = 12V 89.1% Typical

VOUT2 = 1.5V, IOUT2 = 15A, VIN = 12V 90.2% Typical

-B Efficiency

See Figures 4 and 5

VOUT1 = 1.2V, IOUT1 = 15A, VIN = 12V 85.9%

VOUT2 = 1.5V, IOUT2 = 15A, VIN = 12V 88.2%

dc1626afa

DEMO MANUAL DC1626A

QUICK START PROCEDURE

Demonstration circuit 1626A is easy to set up to evalu-

ate the performance of the LTC3838EFE. Please refer to

Figure1 for proper measurement equipment setup and

follow the procedure below.

1. With power off, connect the input supply, load and

meters as shown in Figure 1. Preset the load to 0A

and VIN supply to be 0V. Place jumpers in the following

positions:

JP4 RUN1 ON

JP1 RUN2 ON

JP3 MODE FCM

2. Adjust the input voltage to be between 4.5V to 26V.

VOUT1 should 1.2V ±2%.

OUT2 should 1.5V ±2%.

3. Next, apply 15A load and recheck VOUT.

4. Once the DC regulation is confirmed, observe the output

voltage ripple, load step response, efficiency and other

parameters.

Note 1. Use the BNC connectors labeled VOUT1 or VOUT2

to measure the output voltage ripple.

Note 2. Do not apply the load from the VO1_SNS+ turret

to the VO1_SNS– turret or from the VO2+ turret to the

VO2– turret. These turrets are only intended to monitor

the voltage across COUT1 and COUT5 respectively. Heavy

load currents applied across these turrets may damage

the converter.

Load Step Transient Testing

Demonstration circuit 1626A provides a simple load step

circuit consisting of a MOSFET and sense resistor for each

rail. To apply a load step, follow the steps below.

1. Preset the amplitude of a pulse generator to 0.0V and

the duty cycle to 5% or less.

2. Connect the scope to the VOUT BNC connectors for

the rail under test with a coax cable. To monitor the

load step current, connect the scope probe across the

IOSTEP+/IOSTEP– turrets for that rail.

3. Connect the output of the pulse generator to the PULSE

GEN turret for the rail under test and connect the return

to one of the GND turrets.

4. With the converter running, slowly increase the ampli-

tude of the pulse generator output to provide the desired

load step pulse height. The scaling for the LOAD STEP

signal is 10mV/A.

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DEMO MANUAL DC1626A

QUICK START PROCEDURE

Figure 1. Proper Measurement Equipment Setup

Single Output/Dual Phase Operation

A single output/dual phase converter may be preferred for

high output current applications. The benefits of single

output/dual phase operation islower ripple current through

the input and output capacitors, faster load step response

andsimplifiedthermaldesign.Toimplementsingleoutput/

dual phase operation, make the following modifications:

• Tie VOUT1 to VOUT2 by tying together the exposed

copper pads on the VOUT shapes with pieces of heavy

copper foil.

• Tie VFB2 to INTVCC by stuffing 0Ω at R1. This will

disable the error amp for phase 2 and internally tie the

two ITH signals together.

• Remove the ITH compensation network, VFB divider

and TRACK/SS cap for phase 2.

• Tie VRNG1 to VRNG2 by stuffing 0Ω at R4.

• Tie RUN1 to RUN2 by stuffing 0Ω at R7.

• If the optional transient detect circuit is used, externally

tie the DTR1 pin to the DTR2 pin.

• Re-compensate if necessary.

Vin

Iout2

Vout2

load

Iin

Vout1

Vout2

Iout1

Vout1

load

Vin

*Monitor the voltage across COUT3 and

COUT7 for accurate efficiency measurements.

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DEMO MANUAL DC1626A

QUICK START PROCEDURE

LOAD CURRENT (A)

BOTH RAILS:

QTOP = RJK0305DPB

QBOTTOM = RJK0330DPB

L = VISHAY IHLP4040DZ-01 0.56μH

DCR = 1.7mΩ TYP, 1.8mΩ MAX

EFFICIENCY (%)

75 10515

dc1626a F02

1.5V

1.2V

LOAD CURRENT (A)

BOTH RAILS:

QTOP = RJK0305DPB

QBOTTOM = RJK0330DPB

L = WURTH 7443330068 0.68μH

DCR = 1.35mΩ ±10%

RSENSE = 2.5mΩ

EFFICIENCY (%)

75 10515

dc1626a F04

1.5V

1.2V

LOAD CURRENT (A)

BOTH RAILS:

QTOP = RJK0305DPB

QBOTTOM = RJK0330DPB

L = VISHAY IHLP4040DZ-01 0.56μH

DCR = 1.7mΩ TYP, 1.8mΩ MAX

0.01 10.1 10

dc1626a F03

100

EFFICIENCY (%)

100

1.2V

1.5V

FCM

DCM

LOAD CURRENT (A)

BOTH RAILS:

QTOP = RJK0305DPB

QBOTTOM = RJK0330DPB

L = WURTH 7443330068 0.68μH

DCR = 1.35mΩ ±10%

RSENSE = 2.5mΩ

0.01 10.1 10

dc1626a F05

100

EFFICIENCY (%)

100

1.2V

1.5V

FCM

DCM

Figure 2. Efficiency Curves for the DC1626A-A

(DCR Sense) in FCM

Figure 4. Efficiency Curves for the DC1626A-B

(RSENSE) in FCM

Figure 3. Efficiency Curves for the DC1626A-A

(DCR Sense) in FCM and DCM.

Figure 5. Efficiency Curves for the DC1626A-B

(RSENSE) in FCM and DCM

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DEMO MANUAL DC1626A

QUICK START PROCEDURE

dc1626a F06

LOAD STEP

5A/DIV

1.2VO(AC)

50mV/DIV

15A

109mV

dc1626a F08

LOAD STEP

5A/DIV

1.2VO(AC)

50mV/DIV

15A

114mV

dc1626a F07

LOAD STEP

5A/DIV

1.5VO(AC)

50mV/DIV

15A

108mV

dc1626a F09

LOAD STEP

5A/DIV

1.5VO(AC)

50mV/DIV

15A

108mV

Figure 6. Load Step Response of the 1.2V Rail on the DC1626A-A

(DCR Sense) at VIN = 12V. COUT = 2×Sanyo 2R5TPE330M9 ||

2×100μF X5R 6.3V 1206, L = 0.56μH, fSW = 300kHz

Figure 8. Load Step Response of the 1.2V Rail on the DC1626A-B

(RSENSE) At VIN = 12V. COUT = 2×Sanyo 2R5TPE330M9 || 2×100μF

X5R 6.3V 1206, L = 0.68μH, fSW = 300kHz

Figure 7. Load Step Response of the 1.5V Rail on the DC1626A-A

(DCR Sense) at VIN = 12V. COUT = 2×Sanyo 2R5TPE330M9 ||

2×100μF X5R 6.3V 1206, L = 0.56μH, fSW = 300kHz

Figure 9. Load Step Response of the 1.5V Rail on the DC1626A-B

(RSENSE) at VIN = 12V. COUT = 2×Sanyo 2R5TPE330M9 || 2×100μF

X5R 6.3V 1206, L = 0.68μH, fSW = 300kHz

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DEMO MANUAL DC1626A

1626A-A (DCR Sense)

ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER

Required Circuit Components

1 1 C12 CAP, X7R 330pF 50V 0603 AVX 06035C331KAT2A

2 5 C3, C16, C4, C10, C13 CAP, X5R 0.1μF 50V 0603 AVX 06035D104KAT2A 

3 2 C5, C14 CAP, X5R 0.01μF 25V 0603 AAC 0603D103KAT2A

4 2 C6, C11 CAP, NPO 47pF 16V 0603 AVX 0603YA470KAT4A

5 1 C7 CAP, NPO 220pF 25V 0603 AVX 06033A221KAT2A

6 1 C8 CAP, X5R 4.7μF 16V 0805 AVX 0805YD475KAT2A

7 2 C9, C18 CAP, X5R 1μF 16V 0603 AVX 0603YD105KAT2A

8 2 CIN1, CIN2 CAP, 100μF 35V SIZE-F SUNCON 35HVH100M

9 3 CIN3, CIN4, CIN5 CAP, X5R 10μF 35V 1210 TAIYO YUDEN GMK325BJ106MN-T

10 4 COUT1, COUT2, COUT5, COUT6 CAP, 330μF 2.5V SIZE 7343 SANYO 2R5TPE330M9

11 4 COUT3, COUT4, COUT7, COUT8 CAP, X5R 100μF 6.3V 1206 MURATA GRM31CR60J107ME39L

12 2 D1, D2 DIODE, SCHOTTKY SOD-323 CENTRAL SEMI. CMDSH-4ETR

13 2 L1, L2 IND, 0.56μH VISHAY IHLP4040DZERR56M01

14 2 Q1, Q3 MOSFET, N-CHANNEL LFPAK RENESAS RJK0305DPB-00-J0

15 2 Q2, Q4 MOSFET, N-CHANNEL LFPAK RENESAS RJK0330DPB-00-J0

16 2 R12, R38 RES, 100k 1% 0603 VISHAY CRCW0603100KFKEA

17 1 R13 RES, 15k 1% 0603 VISHAY CRCW060315K0FKEA

18 4 R17, R23, R40, R46 RES, 10k 1% 0603 VISHAY CRCW060310K0FKEA

19 2 R18, R32 RES, 4.02k 1% 0603 VISHAY CRCW06034K02FKEA

20 2 R19, R34 RES, 11k 1% 0603 VISHAY CRCW06011K0FKEA

21 1 R21 RES, 40.2k 1%, 0603 VISHAY CRCW060340K2FKEA

22 2 R27, R25 RES, 2.2Ω 1% 0603 VISHAY CRCW06032R20FKEA

23 1 R28 RES, 137k 1% 0603 VISHAY CRCW0603137KFKEA

24 1 R31 RES, 17.4k 1% 0603 VISHAY CRCW06017K4FKEA

25 2 R42, R43 RES, 10Ω 1% 0603 VISHAY CRCW060310R0FKEA

26 9 R8, R11, R16, R35, R39, R48, R55, R20, R36,

R30, R26

RES, 0Ω 0603 VISHAY CRCW06030000Z0EA

27 2 RS1, RS2 RES, 0.000Ω 1W 1% 2512 TEPRO RN5326

28 1 U1 LTC3838 38-LEAD TSSOP LINEAR TECH. LTC3838EFE

Additional Circuit Components

1 0 C1, C2, C15, C17 CAP, 0603 OPTIONAL

2 0 CIN6-CIN8 CAP, 1210 OPTIONAL

3 0 COUT13-COUT16 CAP, 7343 OPTIONAL

4 0 Q5-Q8 MOSFET, N-CHANNEL LFPAK OPTIONAL

5 0 R1, R4, R7, R9, R47, R14, R15, R24, R29, R41,

R45, R3, R6, R10, R37, R44, R49, R50

RES, 0603 OPTIONAL

6 2 Q9, Q10 MOSFET, N-CHANNEL DPAK VISHAY SUD50N03-12P-E3

7 2 R51, R52 RES, 10k 1% 0603 VISHAY CRCW060310K0FKEA

8 2 R53, R54 RES, 0.01Ω 1/2W 1% 2010 VISHAY WSL2010R0100FEA

PARTS LIST

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DEMO MANUAL DC1626A

1626A-A (DCR Sense)

ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER

Hardware/Components (For Demo Board Only)

1 4 STAND-OFF STAND-OFF, NYLON 0.25" KEYSTONE 8831 (SNAP ON)

2 23 E1-E12, E14-E25 TESTPOINT, TURRET 0.095" MILL-MAX 2501-2-00-80-00-00-07-0

3 6 J1-J6 JACK, BANANA KEYSTONE 575-4

4 2 J7, J8 CONN, BNC 5PINS CONNEX 112404

5 2 JP1, JP4 2MM SINGLE ROW HEADER, 3-PIN SAMTEC TMM-103-02-L-S

6 4 JP1-JP4 SHUNT SAMTEC 2SN-BK-G

7 2 JP2, JP3 2MM SINGLE ROW HEADER, 4-PIN SAMTEC TMM-104-02-L-S

PARTS LIST

1626A-B (RSENSE)

ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER

Required Circuit Components

11C12 CAP, X7R 330pF 50V 0603 AVX 06035C331KAT2A

2 2 C3, C16 CAP, X7R 1000pF 16V 0603 AVX 0603YC102KAT2A

3 3 C4, C10, C13 CAP, X5R 0.1μF 50V 0603 AVX 06035D104KAT2A

4 2 C5, C14 CAP, X5R 0.01μF 25V 0603 AAC 0603D103KAT2A

5 2 C6, C11 CAP, NPO 47pF 16V 0603 AVX 0603YA470KAT4A

6 1 C7 CAP, NPO 220pF 25V 0603 AVX 06033A221KAT2A

7 1 C8 CAP, X5R 4.7μF 16V 0805 AVX 0805YD475KAT2A

8 2 C9, C18 CAP, X5R 1μF 16V 0603 AVX 0603YD105KAT2A

9 2 CIN1, CIN2 CAP, 100μF 35V SIZE-F SUNCON 35HVH100M

10 3 CIN3, CIN4, CIN5 CAP, X5R 10μF 35V 1210 TAIYO YUDEN GMK325BJ106MN-T

11 4 COUT1, COUT2, COUT5, COUT6 CAP, 330μF 2.5V SIZE 7343 SANYO 2R5TPE330M9

12 4 COUT3, COUT4, COUT7, COUT8 CAP, X5R 100μF 6.3V 1206 MURATA GRM31CR60J107ME39L

13 2 D1, D2 DIODE, SCHOTTKY SOD-323 CENTRAL SEMI. CMDSH-4ETR

14 2 L1, L2 IND, 0.68μH WURTH 7443330068

15 2 Q1, Q3 MOSFET, N-CHANNEL LFPAK RENESAS RJK0305DPB-00-J0

16 2 Q2, Q4 MOSFET, N-CHANNEL LFPAK RENESAS RJK0330DPB-00-J0

17 2 R12, R38 RES, 100k 1% 0603 VISHAY CRCW0603100KFKEA

18 1 R13 RES, 15k 1% 0603 VISHAY CRCW060315K0FKEA

19 4 R14, R15, R41, R45 RES, 10Ω 1% 0603 VISHAY CRCW060310R0FKEA

20 4 R17, R23, R40, R46 RES, 10k 1% 0603 VISHAY CRCW060310K0FKEA

21 1 R21 RES, 45.3k 1% 0603 VISHAY CRCW060345K3FKEA

22 2 R27, R25 RES, 2.2Ω 1% 0603 VISHAY CRCW06032R20FKEA

23 1 R28 RES, 137k 1% 0603 VISHAY CRCW0603137KFKEA

24 1 R31 RES, 20k 1% 0603 VISHAY CRCW060320K0FKEA

25 2 R42, R43 RES, 10Ω 1% 0603 VISHAY CRCW060310R0FKEA

26 9 R8, R11, R16, R35, R39, R48, R55, R24, R29 RES, 0Ω 0603 VISHAY CRCW06030000Z0EA

27 2 RS1, RS2 RES, SENSE 0.0025 2512 VISHAY WSL25122L500FEA

28 1 U1 LTC3838 38-LEAD TSSOP LINEAR TECH. LTC3838EFE

dc1626afa

DEMO MANUAL DC1626A

PARTS LIST

1626A-B (RSENSE)

ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER

Additional Circuit Components

1 0 C1, C2, C15, C17 CAP, 0603 OPTIONAL

2 0 CIN6-CIN8 CAP, 1210 OPTIONAL

3 0 COUT13-COUT16 CAP, 7343 OPTIONAL

4 0 Q5-Q8 MOSFET, N-CHANNEL LFPAK OPTIONAL

5 2 Q9, Q10 SUD50N03-12P-E3 VISHAY SUD50N03-12P-E3

6 0 R1, R4, R7, R9, R47, R18, R19, R20, R32, R34,

R20, R36, R3, R6, R10, R37, R44, R49, R50,

R30, R26

RES, 0603 OPTIONAL

7 2 R51, R52 RES, 10k 1% 0603 VISHAY CRCW060310K0FKEA

8 2 R53, R54 RES, 0.01Ω 1/2W 1% 2010 VISHAY WSL2010R0100FEA

Hardware/Components (For Demo Board Only)

1 4 STAND-OFF STAND-OFF, NYLON 0.25" KEYSTONE, 8831 (SNAP ON)

2 23 E1-E12, E14-E25 TESTPOINT, TURRET 0.095" MILL-MAX 2501-2-00-80-00-00-07-0

3 6 J1-J6 JACK, BANANA KEYSTONE 575-4

4 2 J7, J8 CONN, BNC 5-PINS CONNEX 112404

5 2 JP1, JP4 2MM SINGLE ROW HEADER, 3-PIN SAMTEC TMM-103-02-L-S

6 4 JP1-JP4 SHUNT SAMTEC 2SN-BK-G

7 2 JP2, JP3 2MM SINGLE ROW HEADER, 4PIN SAMTEC TMM-104-02-L-S

dc1626afa

DEMO MANUAL DC1626A

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

B B

A A

1.5V / 15A

DCR SENSE FILTER /

DIVIDER FOR PHASE 2

FSW =300kHz

4.5V - 26V

OFF

RUN2

OFF

RUN1

DCR SENSE FILTER /

DIVIDER FOR PHASE 1

1.2V / 15A

NOTE:

TIE SGND PIN TO PGND PAD UNDERNEATH IC.

FCM

DCM

SYNC

60 DEG

90 DEG

120 DEG

CLKOUT

OPTIONAL COMPONENTS FOR SINGLE

OUTPUT, DUAL PHASE OPERATION

10mV / A

LOAD STEP

CIRCUIT #1

IOSTEP1+

LOAD STEP

5% DUTY CYCLE MAX

VOUT1

LOAD STEP

10mV / A

LOAD STEP

CIRCUIT #2

IOSTEP2+

5% DUTY CYCLE MAX

VOUT2

ALL CAPACITORS ARE IN MICROFARADS, 0603.

ASSY L1,L2

NOTES: UNLESS OTHERWISE SPECIFIED

1. ALL RESISTORS ARE IN OHMS, 0603.

-A (DCR SENSE)

2. INSTALL SHUNTS ON JUMPERS AS SHOWN.

-B (RSENSE) Vishay IHLP4040DZ-01 0.56uH

WURTH 7443330068(0.68uH)

C16, C3

0.1uF

1000pF

R32, R18

4.02K

OPT

R34,R19

11K

OPT 0

OPT

R36,R20 R41,R45,

OPT

10 0.000 Ohm 2512

RS1, RS2

0.0025 Ohm 2512

OPTIONAL COUT

ONLY ADD FOOTPRINTS

ON SOLDERMASK, DO

NOT SHOW IN

SCHEMATIC.

PHASMD

MODE

-2PETSOI-1PETSOI

2512

R29,R24 R30,R26 R31 R21

R14,R15,

OPT

OPT 17.4K

20K 40.2K

45.3K

NOTE:

EXTERNALLY TIE THE

DTR1 PIN TO THE DTR2 PIN

IF THE TRANSIENT DETECT

CIRCUIT IS USED

MIKE S.PRODUCTION 11-11-52

REVISION HISTORY

ETADNOITPIRCSED APPROVEDECO REV

Thursday, October 13, 2011

WIDE INPUT RANGE, HIGH EFFICIENCY DUALSTEP-DOWN DC-DC CONVERTER

MIKES.

N/A

LTC3838EFE

DEMO CIRCUIT 1626A

SIZE

DATE:

.VER.ONCI

SHEET OF

TITLE:

APPROVALS

PCB DES.

APP ENG.

TECHNOLOGY

Fax:(408)434-0507

Milpitas,CA95035

Phone:(408)432-1900

1630McCarthyBlvd.

LTC Confidential-For Customer Use Only

CUSTOMER NOTICE

LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TODESIGN 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 LINEARTECHNOLOGY AND

SCHEMATIC

SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.

SCALE = NONE

www.linear.com

SW1

RUN1

RUN2

SW2

EXTVCC

VOUT2

S2+

S2-

VIN

INTVCC

EXTVCC

VIN

S1+

S1-

VOUT1

S2+

S2-

INTVCC

VFB2

TRK/SS2

VRNG2

VRNG1

S1+

S1-

TRK/SS1

TRK/SS2

VIN

INTVCC

TRK/SS1

VOUT2

INTVCC

VFB2 INTVCC

VRNG1 VRNG2

RUN1 RUN2

VOUT1 VOUT2

VOUT1

VOUT2

INTVCC

R15

R21

R14

R48 0

J4 GND

R12

100K

COUT3

100uF

6.3V

1206

R160

COUT5

330uF

7343-D15T

2.5V

R4 OPT

R20

CIN4

10uF

35V

1210

COUT1

330uF

7343-D15T

2.5V

4.7uF

16V

0805

R50

OPT

CIN6

OPT

1210

E22

C16

COUT16

OPT

7343-D15T

R47

OPT

C14 0.01uF

E18PULSE2

OPT

PGOOD2

E15

PGOOD1

J3 VOUT2

RJK0330DPB

JP2

R36

R350

R45

R42

R30

COUT14

OPT

7343-D15T

OPT

LTC3838EFE

19 20

DTR2

SENSE2-

SENSE2+

VFB2

ITH2

VRNG2

PGND

INTVCC

EXTVCC

BG2

PHASEMD

MODE/PLLIN

CLKOUT

DRVCC2

SW2

TG2

BOOST2

PGOOD2

RUN2

PGND

TRACK/SS2

SGND

VRNG1

ITH1

TRACK/SS1

VOUTSENSE1+

VOUTSENSE1-

SENSE1+

1RTD-1ESNES

RUN1

PGOOD1

BOOST1

TG1

SW1

BG1

DRVCC1

VIN

JP1

J6 GND

R27 2.2

CLKOUT

CIN1

100uF

35V

35HV100M

R17

10K

JP4

OPT

R7 OPT

J7 1

1uF

R53

0.01

2010

J5 VOUT1

COUT8

100uF

6.3V

1206

RS1

COUT7

100uF

6.3V

1206

E16

EXTVCC

R29

R41

COUT6

330uF

7343-D15T

2.5V

C7 220pF

OPT

R55 0

CIN3

10uF

35V

1210

CMDSH-3

OPT

7343-D15T

COUT13

E17PULSE1

E10

TRK/SS1

E24

C12 330pF

R1 OPT

R24

E19

GND

COUT2

330uF

7343-D15T

2.5V

E6 VO2+

J8 1

R26

R34

C18

1uF

R19

R23

10K

CIN5

10uF

1210

35V

C10

0.1uF

C15

OPT

E5 VIN-

RJK0305DPB

C5 0.01uF

R13

15K

CMDSH-3

E7 VO2-

J1 VIN

R32

R44

OPT

Q10

SUD50N03-12P

OPT

R18

E23

E21 GND

C6 47pF

R46

10K

C11 47pF

E20 GND

R37

OPT

CIN2

100uF

35V

35HV100M

R10

OPT

E11VO1_SNS+

J2 GND

R51

10K

CIN8

(OPT)

1210

C13

0.1uF

R8 0

JP3

R39 0 R40

10K

R11 0

RJK0305DPB

C17

OPT

R49

OPT

RS2

RUN2

SUD50N03-12P

E3 VIN+

CIN7

(OPT)

1210

COUT4

100uF

6.3V

1206

R38 100K

PLLIN

E12VO1_SNS-

OPT

RJK0330DPB

R31

TRK/SS2

R25

2.2

R28 137K

R54

0.01

2010

R43

E25

R9 OPT

R52

10K

E14

RUN1

OPT

COUT15

OPT

7343-D15T

dc1626afa

DEMO MANUAL DC1626A

LinearTechnology Corporation

1630 McCarthy Blvd., Milpitas, CA 95035-7417

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

LT 1011 REV A • 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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