Linear Technology LTC7138 Guida rapida alla configurazione

dc2172af

DEMO MANUAL DC2172A

Description

LTC7138

High Efficiency, High VIN,

Step-Down Regulator

Demonstrationcircuit2172Ais ahighinputvoltage,400mA

step-down regulator featuring the LTC7138. The output of

the regulator can be programmed for either 5V, 3.3V or

1.8V with on-board jumpers or is adjustable from 800mV

to VIN using an optional feedback divider. The input voltage

range is from 4V to 140V. The LTC7138’s Burst Mode

operation, low quiescent current and internal top FET

switch provide high efficiency over a wide range of loads.

Other features include:

• Optional components to adjust the current limit, make it

proportional to VIN or improve the efficiency and reduce

the output voltage ripple. L, LT, LTC, LTM, Burst Mode, 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

• FBO turret to tie two or more LTC7138 regulators to-

gether if the application requires more load current.

• Optional UVLO and OVLO divider.

• External/internal soft-start.

For more details, refer to the LTC7138 data sheet. The

LTC7138 data sheet gives a complete description of the

IC operation and application information. The data sheet

must be read in conjunction with this quick start guide.

Design files for this circuit board are available at

http://www.linear.com/demo/DC2172A

Specifications are at TA= 25°C

PARAMETER CONDITIONS VALUE

Input Voltage Range 4V to 140V

5.0V Output Voltage VIN = 12V, IOUT = 0mA to 400mA 5.0V ±2%

3.3V Output Voltage VIN = 12V, IOUT = 0mA to 400mA 3.3V ±2%

1.8V Output Voltage VIN = 12V, IOUT = 0mA to 400mA 1.8V ±2%

Maximum Output Current, IOUT VIN = 4V to 140V, VOUT = 5.0, 3.3V, 1.8V or ADJ (VOUT ≤ VIN) 400mA

Typical Efficiency VIN = 12V, VOUT = 5V, IOUT = 400mA 82.3%

Typical Output Ripple VIN = 12V, VOUT = 5V, IOUT = 400mA 87mVP-P

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dc2172af

DEMO MANUAL DC2172A

Quick start proceDure

Demonstration circuit 2172A is easy to set up to evaluate

the performance of the LTC7138. 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 0V.

2) Place the RUN pin jumper (JP3) in the ON position.

3) Set the output to 5V by placing the JP1 jumper in the

B position and the JP2 jumper in the A position.

4) Turn-on the VIN supply and increase to 12V. The 5V

output should be 5V±2% per the Performance Sum-

mary table.

5) Next, apply 400mA load to the output and re-measure

VOUT.

6) Oncethe DC regulation is confirmed, observethe output

voltage ripple, load step response, efficiency and other

parameters for the 5V, 3.3V and 1.8V output settings.

Note 1. CAUTION: The maximum input voltage of the

DC2172A is 140V. Voltages of 140V or lower are high

enough to cause electric shock. Use great care when

testing this demo board.

Note 2. For a 5V output, the input voltage should be 6V

or more.

Note 3. When measuring the output or input voltage ripple,

do not use the long ground lead on the oscilloscope probe.

See Figure 2 for the proper scope probe technique. Short,

stiff leads need to be soldered to the (+) and (–) terminals

of an output capacitor. The probe’s ground ring needs to

touch the (–) lead and the probe tip needs to touch the

(+) lead.

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dc2172af

DEMO MANUAL DC2172A

Quick start proceDure

VOUT

LOAD

–

IOUT

VIN

SUPPLY

–

IIN

+ –

VOUT GND

COUT

Figure 1. Proper Measurement Equipment Setup

Figure 2. Measuring Output Voltage Ripple

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dc2172af

DEMO MANUAL DC2172A

Quick start proceDure

0.01 0.10 1 10 100 1,000

Efﬁciency (%)

Load Current (mA)

L = Sumida CDRH105RNP-151NC

(150µH, DCR = 285mΩ typ)

VOUT = 5V

140VIN

100VIN

48VIN

12VIN

dc2172a F03

Figure 3. Efficiency at 5VOUT

Figure 4. Efficiency at 3.3VOUT

0.01 0.10 1 10 100 1,000

Efﬁciency (%)

Load Current (mA)

dc2172a F04

140VIN

100VIN

48VIN

12VIN

VOUT = 3.3V

L = Sumida CDRH105RNP-151NC

(150µH, DCR = 285mΩ typ)

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dc2172af

DEMO MANUAL DC2172A

Quick start proceDure

Figure 5. Efficiency at 1.8VOUT

0.01 0.10 1 10 100 1,000

Efﬁciency (%)

Load Current (mA)

dc2172a F05

140VIN

100VIN

48VIN

12VIN

VOUT = 1.8V

L = Sumida CDRH105RNP-151NC

(150µH, DCR = 285mΩ typ)

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dc2172af

DEMO MANUAL DC2172A

parts List

ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER

Required Circuit Components

1 1 C1 CAP 22µF, 200V, ELEC NIPPON CHEMI-CON, EMVE201ARA220MKG5S

2 1 C2 CAP 1µF, 2220, 10%, 200V, X7R KEMET C2220X105K2RACTU

3 1 C4 CAP 47nF, 0603, 10%, 25V, X7R AVX 06033C473KAT2A

4 2 C6, C7 CAP 100µF, 1210, 20%, 10V, X7R TAIYO YUDEN LMK325ABJ107MMH-T

5 1 C9 CAP 0.1µF, 0603, 10%, 25V, X7R AVX 06033C104KAT2A

6 1 D1 DIODE SBR1U200P1 DIODES, SBR1U200P1-7

7 1 L1 INDUCTOR 150µH SUMIDA CDRH105RNP-151NC

8 1 R1 RES 2M, 0603Ω, 5%, 1/10W VISHAY CRCW06032M00JNEA

9 1 U1 IC LTC7138EMSE LINEAR TECH LTC7138EMSE#PBF

Additional Demo Board Circuit Components

1 0 C3 CAP 0603 OPTION OPTION

2 0 C8, C10 CAP 1210 OPTION OPTION

3 0 R2, R4, R7, R8 RES 0603 OPTION OPTION

4 2 R3, R6 RES 0Ω 0603 JUMPER VISHAY CRCW06030000Z0ED

Hardware

1 5 E1, E2, E3, E4, E5 TURRET MILL-MAX 2501-2-00-80-00-00-07-0

2 3 JP1, JP2, JP3 HEADER 2mm PIN SULLINS, NRPN031PAEN-RC

3 4 MH1, MH2, MH3, MH4 STANDOFF SNAP ON KEYSTONE_8831

4 3 JP1, JP2, JP3 SHUNT 2mm SAMTEC 2SN-BK-G

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dc2172af

DEMO MANUAL DC2172A

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

B B

A A

[3]

4V - 140V

1.8V / 3.3V / 5V

200V 400mA

2. FOR 5V OUTPUT, VIN RANGE IS 6V-140V.

1. ALL RESISTORS ARE 0603.

ALL CAPACITORS ARE 0603.

NOTE: UNLESS OTHERWISE SPECIFIED

JP1 JP2VOUT

1.8V

3.3V

5.0V

EXT. R

REFER TO THE DATA SHEET FOR

APPLICATIONS INFORMATION.

4. SMALLER AMOUNT OF COUT CAN BE USED

FOR APPLICATIONS THAT CAN TOLERATE

HIGHER OUPUT RIPPLE.

VOUT

VIN

SIZE

DATE:

.VER.ONCI

SHEET OF

TITLE:

APPROVALS

PCB DES.

APP ENG.

TECHNOLOGY Fax: (408)434-0507

Milpitas, CA 95035

Phone: (408)432-1900

1630 McCarthy Blvd.

LTC Confidential-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 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 LINEAR TECHNOLOGY AND

SCHEMATIC

SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.

SCALE = NONE

www.linear.com

Tuesday, January 06, 2015 1 1

HIGH EFFICIENCY, HIGH VIN, 400mA

N/A LTC7138EMSE

DEMO CIRCUIT 2172A

STEP-DOWN REGULATOR

SIZE

DATE:

.VER.ONCI

SHEET OF

TITLE:

APPROVALS

PCB DES.

APP ENG.

TECHNOLOGY Fax: (408)434-0507

Milpitas, CA 95035

Phone: (408)432-1900

1630 McCarthy Blvd.

LTC Confidential-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 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 LINEAR TECHNOLOGY AND

SCHEMATIC

SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.

SCALE = NONE

www.linear.com

Tuesday, January 06, 2015 1 1

HIGH EFFICIENCY, HIGH VIN, 400mA

N/A LTC7138EMSE

DEMO CIRCUIT 2172A

STEP-DOWN REGULATOR

SIZE

DATE:

.VER.ONCI

SHEET OF

TITLE:

APPROVALS

PCB DES.

APP ENG.

TECHNOLOGY Fax: (408)434-0507

Milpitas, CA 95035

Phone: (408)432-1900

1630 McCarthy Blvd.

LTC Confidential-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 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 LINEAR TECHNOLOGY AND

SCHEMATIC

SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.

SCALE = NONE

www.linear.com

Tuesday, January 06, 2015 1 1

HIGH EFFICIENCY, HIGH VIN, 400mA

N/A LTC7138EMSE

DEMO CIRCUIT 2172A

STEP-DOWN REGULATOR

OPT

JP3

ON OFF

RUN

JP2

[3]

OPT

100uF

1210

10V

OPT

C10

OPT

1210

GND

22uF

VIN

47nF

0.1uF

JP1

[3]

OPT

1uF

200V

2220 D1

SBR1U200P1

L1 150uH

CDRH105R

GND

FB0

VOUT

LTC7138EMSE

SW 1

VIN

FBO

VPRG1 7

VPRG2 6

GND

VFB 9

SS 10

ISET

OVLO

RUN

ANODE 16

GND

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dc2172af

DEMO MANUAL DC2172A

Linear Technology Corporation

1630 McCarthy Blvd., Milpitas, CA 95035-7417

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

 LINEAR TECHNOLOGY CORPORATION 2015

LT 0115 • 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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