Linear Technology DC1889A Quick setup guide

dc1889af

DEMO MANUAL DC1889A

Description

LTM4624EY

4A Step-Down µModule

Regulator

Demonstration circuit 1889A features the LT M

4624EY

µModule

regulator, a tiny high performance high

efficiency step-down regulator. The LTM4624EY has an

operating input voltage range of 4V to 14V and is able to

provide an output current of up to 4A. The output voltage

is programmable from 0.6V to 5.5V. The LTM4624EY is

a complete DC/DC point-of-load regulator in a thermally

enhanced 6.25mm ×6.25mm ×5.01mm BGA package

requiring only a couple capacitors and a resistor. Output L, LT, LTC, LTM, Linear Technology, the Linear logo and µModule are registered trademarks of

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

performance summary

BoarD photo

voltage tracking is available through the TRACK/SS pin for

supply rail sequencing. The LTM4624 data sheet must be

readinconjunctionwiththisdemomanualpriortoworking

on or modifying demo circuit 1889A.

Design files for this circuit board are available at

http://www.linear.com/demo

Specifications are at TA= 25°C

PARAMETER CONDITIONS/NOTES VALUE

Input Voltage Range 4V – 14V

Output Voltage, VOUT Jumper Selectable 1.0VDC, 1.2VDC, 1.5VDC, 1.8VDC, 2.5VDC, 3.3VDC,

5VDC

Maximum Continuous Output Current Derating is Necessary for Certain operating

Conditions. See Data Sheet for Details

4A DC

Default Operating Frequency 1MHz

Efficiency VIN = 12V, VOUT = 1.8V, IOUT = 4A 83.6% See Figure 2

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DEMO MANUAL DC1889A

Quick start proceDure

Demonstration circuit 1889Ais an easy way to evaluate the

performance of the LTM4624EY. Please refer to Figure 1

for test setup connections and follow the procedure below.

1. With power off, place the jumpers in the follow-ing

positions for a typical 1.8Vout application:

JP7 JP6 JP4

RUN MODE VOUT Select

ON CCM 1.8V

2. Before connecting input supply, load and meters, pre-

set the input voltage supply to be between 4V to 14V.

Pre-set the load current to 0A.

3. With power off, connect the load, input voltage supply

and meters as shown in Figure 1.

4. Turn on input power supply. The output voltage meter

should display the selected output voltage ±2%.

5. Once the proper output voltage is established, adjust

the load current within the 0A to 4A range and observe

the load regulation, efficiency, and other parameters.

Output voltage ripple should be measured at J6 with a

BNC cable terminated into 50Ω and an oscilloscope.

6. To observe increased light load efficiency place the

MODE pin jumper (JP6) in the DCM position while input

power is removed.

7. For optional load transient testing apply an adjustable

positive pulse signal between IOSTEP CLK and GND

pins. The pulse amplitude sets the load step current

amplitude. The pulse width should be short (<1ms)

and pulse duty cycle should be low (<15%) to limit the

thermal stress on the load transient circuit. The load

step current can be monitored with a BNC connected

to J5 (50mV/A).

+–

– +

–

LOAD

0A TO 4A

–

VIN

Figure 1. Test Setup

dc1889af

DEMO MANUAL DC1889A

Quick start proceDure

LOAD CURRENT (A)

EFFICIENCY (%)

75 123

5VOUT

3.3VOUT

2.5VOUT

1.8VOUT

1.5VOUT

1.2VOUT

1VOUT

LOAD CURRENT (A)

EFFICIENCY (%)

75 123

3.3VOUT

2.5VOUT

1.8VOUT

1.5VOUT

1.2VOUT

1VOUT

12VIN CCM Efficiency vs Load Current 5VIN CCM Efficiency vs Load Current

Figure 2. Measured Supply Efficiency at 12VIN and 5VIN

VOUT

50mV/DIV

IOUT(STEP)

2A/DIV

VIN (V)

VOUT (V)

1.8

COUT

1 ×100µF/6.3V+

1 ×22µF/6.3V+

1 ×47µF/6.3V

VOUT

10mV/DIV

VIN (V)

VOUT (V)

1.8

iOUT (A)

COUT

1 ×100µF/6.3V+

1 ×22µF/6.3V+

1 ×47µF/6.3V

Figure 3. Measured Load Transient Response (2A to 4A Load Step) Figure 4. Measured VOUT Ripple (20MHz)

dc1889af

DEMO MANUAL DC1889A

parts List

ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER

1 1 C1 CAP., X5R, 2.2µF, 10V, 10%, 0603 TAIYO YUDEN, LMK107BJ225KA-T

2 2 C3, C13 CAP., X5R, 22µF, 16V, 20%, 1206 TAIYO YUDEN, EMK316BJ226ML-T

3 1 C20 CAP., X5R, 47µF, 6.3V, 20%,1206 TAIYO YUDEN, JMK316BJ476ML

4 1 C12 CAP., X5R, 100µF, 6.3V, 20%,1210 TAIYO YUDEN, JMK325ABJ107MM-T

5 2 C9, C15 CAP., X5R, 0.1µF, 25V, 10%, 0603 AVX, 06033D104KAT

6 1 R4 RES., CHIP, 90.9k, 1/16W, 1%, 0603 VISHAY, CRCW060390K9FKEA

7 1 R11 RES., CHIP, 10Ω, 1/16W, 1%, 0603 VISHAY, CRCW060310R0FKEA

8 1 U1 I.C., LTM4624EY, BGA LINEAR TECH., LTM4624EY#PBF

Additional Demo Board Circuit Components

1 1 C10 CAP., X5R, 22µF, 25V, 10%, 7343 SANYO, 25TQC22MV

2 0 C11, C14 CAP., 1210, OPTION OPTION

3 0 C5 CAP., 1206, OPTION OPTION

4 3 C4, C6, C18 CAP., X5R, 1µF, 10V, 10%, 0603, OPTION TAIYO YUDEN, LMK107BJ105KA-T

5 0 C7, C19 CAP., 0603, OPTION OPTION

6 0 C17 CAP., 7343, OPTION OPTION

7 1 C2 CAP., X5R, 10µF, 16V, 20%, 0805 TAIYO YUDEN, EMK212ABJ106KG-T

8 1 C16 CAP., X5R, 22µF, 6.3V, 20%, 0805 TAIYO YUDEN, JMK212ABJ226MD-T

9 1 C8 CAP., X7R, 100pF, 50V, 10%, 0603 AVX, 06033C101KAT2A

10 1 Q1 N-Channel 30-V MOSFET,TO-252 VISHAY, SUD50N03-09P-E3

11 1 RS2 RES., CHIP, 0.05Ω, 1W, 1%, 2512 VISHAY, WSL2512R0500FEB

12 1 R3 RES., CHIP, 10k, 1/16W, 1%, 0603 VISHAY, CRCW060310K0FKEA

13 7 R5, R6, R7, R14, R15, R16, R10 RES., CHIP, OPTION, 1/16W, 1%, 0603 OPTION

14 0 R1, R12, R2 RES., CHIP, OPTION, 1/16W, 1%, 0603 OPTION

15 1 R8 RES., CHIP, 100k, 1/16W, 1%, 0603 VISHAY, CRCW0603100KFKEA

16 1 R9 RES., CHIP, 150k, 1/16W, 1%, 0603 VISHAY, CRCW0603150KFKEA

17 1 R13 RES., CHIP, 0Ω, 1/16W, 1%, 0603 VISHAY, CRCW06030000Z0EA

Hardware

1 11 E2, E4-E13 TESTPOINT, TURRET, 0.095" MILL-MAX, 2501-2-00-80-00-00-07-0

2 7 JP1-JP4, JP8-JP10 2MM SINGLE ROW HEADER, 2-PIN SAMTEC, TMM102-02-L-S

3 1 JP6 2MM DOUBLE ROW HEADER, 2X2 PIN SAMTEC, TMM-102-02-L-D

4 1 JP7 2MM SINGLE ROW HEADER, 3-PIN SAMTEC, TMM-103-02-L-S

5 2 J5, J6 CONN, BNC, 5 PINS CONNEX, 112404

6 3 JP1, JP6, JP7 SHUNT SAMTEC, 2SN-BK-G

7 4 STAND OFF STAND OFF, SNAP ON KEYSTONE_8832

dc1889af

DEMO MANUAL DC1889A

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

dc1889af

DEMO MANUAL DC1889A

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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Largest Supplier of Electrical and Electronic Components

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