Linear Technology MModule LTM8023 Guida rapida alla configurazione

dc1195af

DEMO MANUAL DC1195A

DESCRIPTION

LTM8023 36V, 2A DC/DC

µModule

Regulator

Demonstration circuit 1195 features the LTM

8023, a

step-down regulator preconﬁgured to deliver 3.3V at up

to 2A from a 5V to 36V input supply. The LTM8023 is a

step-down converter, so minimum amount of headroom

is required to keep the output in regulation. In addition,

the input voltage required to turn on is higher than that

required to run (see Minimum Input Voltage section in the

data sheet for detail). The optional Burst Mode

operation

of LTM8023 supports high efﬁciency and low output ripple

at light load conditions.

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

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

respective owners.

PARAMETER CONDITION VALUE

Input Voltage Range 5V (Note 1) to 36V

Output Voltage VOUT 3.3V

Maximum Output Current 2A

Typical Switching Frequency 600kHz

Note 1: The circuit requires more than 5V to run at full load. See Figure 1 and the data sheet for detail.

BOARD PHOTO

PERFORMANCE SUMMARY

The LTM8023 data sheetgives a completedescription of the

part, operation and application information. The LTM8023

data sheet must be read in conjunction with this manual

to operate or modify demo circuit 1195.

Design ﬁles for this circuit board are available at

http://www.linear.com/demo

(TA= 25°C)

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dc1195af

DEMO MANUAL DC1195A

QUICK START PROCEDURE

Demonstration circuit 1195 is a simple way to evaluate

the performance of the LTM8023. Refer to Figure 2 and

Figure 3 for proper measurement equipment setup and

follow the procedure below:

NOTE. When measuring the input or output voltage ripple,

care must be taken to avoid a long ground lead on the

oscilloscope probe. Measure the input or output voltage

ripple by touching the probe tip directly across the VIN or

VOUT and GND terminals. See Figure 3 for proper scope

probe technique.

1. Place JP1 on the ON position.

2. With power off, connect the input power supply to VIN

and GND.

3. Turn on the power at the input. The output voltage

should rise to 3.3V.

4. Once the proper output voltage is established, adjust

the load within the operating range and observe the

output voltage regulation, ripple voltage, efﬁciency and

other parameters.

Figure 1. Load Current vs Input Voltage (3.3VOUT)

INPUT VOLTAGE (V)

LOAD CURRENT (mA)

1195 F01

500

2500

2000

1500

1000

0 10 20 30 40

25°C

40°C

85°C

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dc1195af

DEMO MANUAL DC1195A

QUICK START PROCEDURE

Figure 2. Proper Measurement Equipment Setup

Figure 3. Measuring Input or Output Ripple

GNDVIN

Figure 4. Efﬁciency

OUTPUT CURRENT (A)

0.01 0.1 1

EFFICIENCY (%)

1195 F04

VOUT = 3.3V

5VIN

12VIN

24VIN

36VIN

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dc1195af

DEMO MANUAL DC1195A

PARTS LIST

ITEM QUANTITY REFERENCE-DESCRIPTION DESCRIPTION MANUFACTURER’S PART NUMBER

1 1 CIN Cap, 22µF 20% 50V Alum Sanyo 50CE22BS

2 1 C1 Cap, 2.2µF 10% 50V X7R, 1206 Murata GRM31CR71H225KA88L

3 1 C2 Cap, 22µF 20% 10V X5R, 1206 Taiyo Yuden LMK316BJ226ML-T

4 1 C3 Cap, 0.1µF 10% 50V X7R, 0603 TDK C1608X7R1H104K

5 5 E1, E2, E4, E5, E9 Turret Mill-Max 2501-2-00-80-00-00-07-0

6 4 E3, E6, E7, E8 Turret Mill-Max 2308-2-00-80-00-00-07-0

7 1 JP1 Header, 3 Pin, 2mm Samtec TMM-103-02-L-S

8 1 R1 Res, 154k 1% 1/16W, 0402 Vishay CRCW0402154KFKEA

9 1 R2 Res, 56.2k 1% 1/16W, 0402 Vishay CRCW040256K2FKED

10 2 R4, R3 Res, 100k 1% 1/16W, 0402 Vishay CRCW0402100KFKED

11 1 R5 Res, 10k 5% 1/16W, 0402 Vishay CRCW040210K0JNED

12 1 U1 IC, Module Linear Technology LTM8023EV

13 4 Standoff, Snap On Keystone 8831

14 1 XJP1 Shunt, 2mm Samtec 2SN-BK-G

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dc1195af

DEMO MANUAL DC1195A

Information furnished by Linear Technology Corporation is believed to be accurate and reliable.

However, noresponsibility is assumed for its use. Linear Technology Corporation makes no representation

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

3.3V/2A

OFF

W. GU

5V - 36V







PROD

3 10/29/07

REVISION HISTORY

DESCRIPTION DATE APPROVEDECO REV

Customer Notice:

Linear Technology has made a best effort to

design a circuit that meets customer-supplied specifications;

however, it remains the customers 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

Applications Engineering for assistance.

This circuit is proprietary to Linear Technology and supplied

for use with Linear Technology parts.

DC1195A

Wednesday, January 02, 2008

SCH, LTM8023EV, 2A DC/DC STEP-DOWN

MEI 11/29/06

1195A-3.DSN

MODULE

SIZE

SCALE:

CAGE CODE DWG NO REV

SHEET OF

FILENAME:

TITLE

CONTRACT NO.

APPROVALS DATE

DRAWN

CHECKED

APPROVED

ENGINEER

DESIGNER

TECHNOLOGY

1630 McCarthy Blvd.

Milpitas, CA 95035

Phone: (408)432-1900

Fax: (408)434-0507

VOUTVIN

VIN

VOUT

GND

22uF

10V

2.2uF

50V

GND

BIAS

R2 56.2K

154K

GND

100K

G1,G2,G3

B3,B4,C1,C2,C3,C4

GND

A5,A6,A7,B5

E1,E2,E3,E4,

H1,H2,H3

A1,A2,A3,A4,B1,B2,

B6,B7,C5,C6

C7,D1,D2,D3,

D4,D5,D6,D7,

E5,E6,E7,F6

VIN VOUT

LTM8023EV

BIAS

RUN/SS

AUX

SYNC

PGOOD

ADJ

SYNC

RUN/SS

0.1uF

CIN

22uF

50V

PGOOD

100K

10K

JP1

VIN

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dc1195af

DEMO MANUAL DC1195A

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 1010 • 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

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