R1

510k

R2

33k

SW

FB

GND

SHDN

D

1

2

3

4

5

LM2705

L

68 PH

20V

6 mA

4.7 PF

1 PF

L: Coilcraft DT1608C-683

D: ON Semiconductor MBRM130LT3

LM2705

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SNVS191E – NOVEMBER 2002 – REVISED MAY 2013

LM2705 Micropower Step-up DC/DC Converter with 150mA Peak Current Limit

Check for Samples: LM2705

1

FEATURES

DESCRIPTION

The LM2705 is a micropower step-up DC/DC in a

2

•

150mA, 0.7

Ω, internal switch

small 5-lead SOT-23 package. A current limited, fixed

•

Uses small surface mount components

off-time control scheme conserves operating current

•

Adjustable output voltage up to 20V

resulting in high efficiency over a wide range of load

conditions. The 21V switch allows for output voltages

•

2.2V to 7V input range

as high as 20V. The low 400ns off-time permits the

•

Input undervoltage lockout

use of tiny, low profile inductors and capacitors to

•

0.01µA shutdown current

minimize

footprint

and

cost

in

space-conscious

portable applications. The LM2705 is ideal for LCD

•

Small 5-Lead SOT-23 package

panels requiring low current and high efficiency as

well as white LED applications for cellular phone

APPLICATIONS

back-lighting. The LM2705 can drive up to 3 white

•

LCD Bias Supplies

LEDs from a single Li-Ion battery. The low peak

inductor current of the LM2705 makes it ideal for USB

•

White LED Back-Lighting

applications.

•

Handheld Devices

•

Digital Cameras

•

Portable Applications

Typical Application Circuit

Figure 1. Typical 20V Application

1

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Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

2

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PRODUCTION DATA information is current as of publication date.

Copyright © 2002–2013, Texas Instruments Incorporated

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.