Linear Technology DC1905A Quick setup guide

dc1905af

DEMO MANUAL DC1905A

Description

LTM4633

High Efficiency, Triple 10A

Step-Down µModule Regulator

Demonstrationcircuit DC1905AfeaturestheLT M

4633EY,

a high efficiency, triple 10A step-down power µModule

regulator. The input voltage range is from 4.7V to 16V with

commoninputsource,or2.375Vto16Vwithanexternalbias

supply.Theoutputvoltagerangeis0.8Vto1.8VforChannel1

and Channel 2, 0.8V to 5.5V for Channel 3. Derating is

necessary forcertain VIN,VOUT,frequency and thermal con-

ditions. The DC1905A offers access to the TRACK/SS pins

allowing the user to program output tracking or soft-start

period.Theboard operates in continuous conduction mode

in heavy load conditions. For high efficiency at low load L, LT, LTC, LTM, Burst Mode, µModule, Linear Technology and the Linear logo are registered

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

respective owners.

BoarD photo

currents, the MODE jumper (JP4) selects pulse-skipping

mode for noise sensitive applications or Burst-Mode

operation in less noise sensitive applications. Channel 1

and 2 can be connected in parallel for a single 20A output

solutionwith optional jumperresistors. The LTM4633 data

sheet must be read in conjunction with this demo manual

prior to working on or modifying demo circuit DC1905A.

Design files for this circuit board are available at

http://www.linear.com/demo/DC1905A

dc1905af

DEMO MANUAL DC1905A

Quick start proceDure

Demonstration circuit DC1905A is an easy way to evalu-

ate the performance of the LTM4633EY. Please refer to

Figure 1 for proper measurement equipment setup and

follow the procedure below:

1. Place jumpers in the following positions for a typical

application:

RUN1 RUN2 RUN3 MODE

ON ON ON CCM

2. With power off, connect the input power supply, loads

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 of channel 1 should be 1.0V±1.5% (0.985V

to 1.015V). The output voltage of channel 2 should be

1.2V ±1.5% (1.182V to 1.218V). The output voltage of

channel 3 should be 3.3V ±1.5% (3.25V to 3.349V).

4. Vary the input voltage from 4.7V to 16V and adjust the

load current of each channel from 0A to 10A. Observe

the output voltage regulation, ripple voltage, efficiency,

and other parameters.

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

adjustable pulse signal between IOSTEP_CLK and GND

test points. The pulse amplitude sets the load step cur-

rent amplitude. Keep the pulse width short (<1ms) and

pulse duty cycle low (<5%) to limit the thermal stress

on the load transient circuit. Switch the jumper resistors

R30, R31 or R34 (on the backside of boards) to apply

load transient on channel 1, channel 2, or channel 3

respectively.

6. (Optional) LTM4633 can be synchronized to an external

clock signal. Place the JP4 jumper on EXT_CLK and

apply a clock signal (0V to 5V, square wave) on the

CLKIN test point.

7. (Optional) The outputs of LTM4633 can track another

supply. If tracking external voltage is selected, the cor-

respondingtestpoints, TRACK1, TRACK2, and TRACK3,

need to be connected to a valid voltage signal.

8. (Optional) Channel 1 and 2 can be connected in paral-

lel for a 20A polyphase operation on DC1905A. Install

0Ω resistors on R32, R33, R35, R36 and remove R15.

Output voltage is set by R4 based on equation VOUT =

0.8V (1 + 60.4k/2/R4).

performance summary

Specifications are at TA= 25°C

PARAMETER CONDITIONS VALUE

Input Voltage Range 4.7V to 16V

Output Voltages 1.0V, 1.2V, 3.3V ±1.5%

Maximum Continuous Output Current Derating Is Necessary for Certain Operating Conditions.

See Data Sheet for Details

10ADC for Each Channel

Operating Frequency 750kHz

Efficiency of Channel 1 VIN = 12V, VOUT1 = 1.0V, IOUT1 = 10A 77% See Figure 2

Efficiency of Channel 2 VIN = 12V, VOUT2 = 1.2V, IOUT2 = 10A 81% See Figure 3

Efficiency of Channel 3 VIN = 12V, VOUT3 = 3.3V, IOUT3 = 10A 91% See Figure 4

Load Transient of Channel 1 VIN = 12V, VOUT1 = 1.0V, ISTEP = 0A to 5A See Figure 5

Load Transient of Channel 2 VIN = 12V, VOUT2 = 1.2V, ISTEP = 0A to 5A See Figure 6

Load Transient of Channel 3 VIN = 12V, VOUT3 = 3.3V, ISTEP = 0A to 5A See Figure 7

dc1905af

DEMO MANUAL DC1905A

Quick start proceDure

–

LOAD LOAD LOAD

–+

VIN

dc1905a F01

+–

Figure 1. Measurement Setup of DC1905A

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DEMO MANUAL DC1905A

Figure 2. Measured Efficiency on Channel 1. VOUT1 = 1.0V,

fSW = 750kHz, CCM, Channel 2, 3 Disabled

DC1905A Efficiency (LTM4633) VOUT = 1.0V DC1905A Efficiency (LTM4633) VOUT = 1.2V

DC1905A Efficiency (LTM4633) VOUT =3.3V

Figure 3. Measured Efficiency on Channel 2. VOUT2 = 1.2V,

fSW = 750kHz, CCM, Channel 1, 3 Disabled

Figure 4. Measured Efficiency on Channel 3. VOUT3 = 3.3V,

fSW = 750kHz, CCM, Channel 1, 2 Disabled

Quick start proceDure

LOAD CURRENT (A)

EFFICIENCY (%)

dc1905a F02

100

1086420

VIN = 16V

VIN = 12V

VIN = 8V

VIN = 5V

LOAD CURRENT (A)

EFFICIENCY (%)

dc1905a F03

100

1086420

VIN = 16V

VIN = 12V

VIN = 8V

VIN = 5V

LOAD CURRENT (A)

EFFICIENCY (%)

dc1905a F04

100

1086420

VIN = 16V

VIN = 12V

VIN = 8V

VIN = 5V

dc1905af

DEMO MANUAL DC1905A

Quick start proceDure

Figure 6. Measured Channel 2 Load Transient

VIN = 12V, VOUT1 = 1.2V, ISTEP = 0A to 5A, di/dt = 5A/µs

VOUT = 100mV/DIV

IOUT_STEP = 5A/DIV

dc1905a F06

Figure 5. Measured Channel 1 Load Transient

VIN = 12V, VOUT1 = 1.0V, ISTEP = 0A to 5A, di/dt = 5A/µs

VOUT = 100mV/DIV

IOUT_STEP = 5A/DIV

dc1905a F05

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DEMO MANUAL DC1905A

Quick start proceDure

Figure 8. Thermal Image of LTM4633

VIN = 12V, VOUT1 = 1.0V, ILOAD1 = 10A,

VOUT2 = 1.2V, ILOAD2 = 10A, VOUT3 = 3.3V, ILOAD3 = 2A

Ambient Temperature= 21.6°C, No Forced Air Flow

Figure 9. Thermal Image of LTM4633

VIN = 12V, VOUT1 = 1.0V, ILOAD1 = 10A,

VOUT2 = 1.2V, ILOAD2 = 10A, VOUT3 = 3.3V, ILOAD3 = 5A

Ambient Temperature= 21.6°C, No Forced Air Flow

Figure 7. Measured Channel 3 Load Transient

VIN = 12V, VOUT3 = 3.3V, ISTEP = 0A to 5A

VOUT = 200mV/DIV

IOUT_STEP = 5A/DIV

dc1905a F07

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DEMO MANUAL DC1905A

parts List

ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER

Required Circuit Components

1 1 U1 LTM4633EY#PBF, BGA-15 × 15-144P LINEAR TECH., LTM4633EY#PBF

2 1 CIN1 Cap., 150µF, 25V, Aluminum Electr., SUN ELECT., 25CE150AX

3 3 CIN2, CIN3, CIN5 Cap., X5R, 22µF, 25V, 10%,1210 MURATA, GRM32ER61E226KE15L

4 1 C5 Cap., X5R, 4.7µF, 10V,10%, 0603 AVX, 0603ZD475KAT2A

5 1 C4 Cap., X7R, 1µF, 10V,10%, 0603 AVX, 0603ZC105KAT2A

6 3 COUT1, COUT5, COUT12 Cap., 470µF, 4V, POSCAP, F8 SANYO, 4TPE470MCL

7 3 COUT4, COUT7, COUT9 Cap., X5R, 100µF, 6.3V, 20%, 1210 AVX, 12106D107MAT2A

8 3 C1, C6, C9 CAP., 220pF, 10%, 50V, NPO 0603 AVX, 06035A221KAT

9 3 C12, C13, C14 Cap., X5R, 0.1µF,25V, 10%, 0603 AVX, 06033D104KAT2A

10 4 R1, R6, R14, R16, R17, R19 Res., Chip, 10, 1%, 0603 VISHAY, CRCW060310R0FKEA

11 1 R4 Res., Chip, 243k, 1%, 0603 VISHAY, CRCW0603243K0FKEA

12 4 R8, R9, R18, R21 Res., Chip, 10k, 1%, 0603 VISHAY, CRCW060310K0FKEA

13 1 R15 Res., Chip, 121k, 1%, 0603 VISHAY, CRCW0603121K0FKEA

14 1 R20 Res., Chip, 19.1k, 1%, 0603 VISHAY, CRCW060319K1FKEA

Additional Demo Board Circuit Components

1 2 C18, C19 Cap., X7R, 1µF, 10V,10%, 0603 AVX, 0603ZC105KAT2A

2 0 COUT2, COUT3, COUT6, COUT8,

COUT10, COUT11

1210 OPT

3 0 C2, C3, C7, C8, C10, C11 0603 OPT

4 3 C15, C16, C17 CAP., X7R, 0.01µF, 50V, 10%, 0603 AVX, 06035C103KAT2A

5 1 Q1 N-Channel 30-V MOSFET VISHAY, SUD50N03-09P-GE3

6 3 R2, R10, R12 Res., Chip, 23.2k, 1%, 0603 VISHAY, CRCW060323K2FKEA

7 2 R5, R30 Res., Chip, 0Ω, 0.5W, 2010 TEPRO,RN6083

8 1 R7 Res., Chip, 0Ω, 1%, 0805 VISHAY, CRCW08050000Z0ED

9 1 R37 Res., Chip, 10k, 1%, 0603 VISHAY, CRCW060310K0FKEA

10 4 R22, R24, R26, R28 Res., Chip, 0Ω, 1%, 0603 VISHAY, CRCW06030000Z0EA

11 0 R31, R34 2010 OPT

12 1 R38 Res., Chip, 0.01Ω, 2W, 2512 VISHAY, WSL2512R0100FEA

13 0 R39 2512 OPT

14 0 R3, R11, R13, R23, R25, R27, R29,

R32, R33, R35, R36

0603 OPT

15 0 CIN4 1210 OPT

Hardware: For Demo Board Only

1 20 E1-E20 TESTPOINT, TURRET, .094" PBF MILL-MAX, 2501-2-00-80-00-00-07-0

2 3 JP1, JP2, JP3 HEADER 3 PIN, 0.079 SINGLE ROW SAMTEC, TMM103-02-L-S

3 1 JP4 HEADER 8 PIN, 0.079 DOUBLE ROW SAMTEC, TMM104-02-L-D

4 1 JP5 HEADER 2 PIN, 0.079 SINGLE ROW SAMTEC, TMM102-02-L-S

5 8 J1-J8 JACK BANANA KEYSTONE, 575-4

6 4 XJP1-XJP4 SHUNT, .079" CENTER SAMTEC, 2SN-BK-G

7 4 (STAND-OFF) STAND-OFF, NYLON, 0.50" KEYSTONE, 8833(SNAP ON)

dc1905af

DEMO MANUAL DC1905A

schematic Diagram

dc1905af

DEMO MANUAL DC1905A

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

dc1905af

DEMO MANUAL DC1905A

Linear Technology Corporation

1630 McCarthy Blvd., Milpitas, CA 95035-7417

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

 LINEAR TECHNOLOGY CORPORATION 2013

LT 0713 • 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 LT C 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 LT C 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. LT C assumes no liability for applications assistance,

customer product design, software performance, or infringement of patents or any other intellectual property rights of any kind.

LT C 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 LT C applica-

tion engineer.

Mailing Address:

Linear Technology

1630 McCarthy Blvd.

Milpitas, CA 95035

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