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LT1109A

Micropower

DC/DC Converter

Flash Memory VPP Generator

Adjustable and Fixed 5V, 12V

FEATURES

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DESCRIPTIO

Uses Off-the-Shelf Inductors

Low Cost

8-Pin DIP or SO Package

Fixed 5V or 12V Output or Adjustable Version

Only Four External Components Required

360碌A Standby Current

Logic-Controlled Shutdown

The LT1109A is a simple step-up DC/DC converter. The 8-

pin DIP or SOIC devices require only four external compo-

nents to construct a complete DC/DC converter. Current

drain is just 360碌A at no load, making the device ideal for

cost-sensitive applications where standby current must

be kept to a minimum.

The LT1109A-12 can deliver 12V at over 150mA from a 5V

supply, enough power to program four flash memory

chips simultaneously. The LT1109A-5 can deliver 5V at up

to 110mA from a 2V input. The devices feature a shutdown

pin that turns off the oscillator when taken low. The gated-

oscillator design requires no frequency compensation

components. High frequency 120kHz operation permits

the use of small surface mount inductors and capacitors.

APPLICATI

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Flash Memory VPP Generators

5V to 12V Converters

3.3V to 12V Converters

Disk Drives

PC Plug-In Cards

Peripherals

Battery-Powered Equipment

TYPICAL APPLICATI

All Surface Mount

Flash Memory VPP Generator

L1*

33碌H

MBRS130T3

3

SW

V

IN

SENSE

Output Current

13.0

12V

12.5

V

OUT

2V/DIV

OUTPUT VOLTAGE (V)

+V

IN

5V

C1

22碌F

10V

1

8

V

OUT

12V

C2

47碌F

20V

12.0

11.5

11.0

10.5

V

IN

= 5V

+

7

LT1109ACS8-12

SHUTDOWN

PGND

GND

4

5

+

V

IN

= 4.5V

SHUTDOWN

5V/DIV

500碌s/DIV

1109A TA03

**

* COILTRONICS CTX33-2

SUMIDA CD54-330LC

** 1 = PROGRAM

0 = SHUTDOWN

10.0

1109A TA01

0

50

250

100

150

200

OUTPUT CURRENT (mA)

300

1109A TA02

U

Output Voltage

UO

UO

1

next

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