LT3464

1

3464i

s

Tiny Solution Size

s

Low Quiescent Current

• 25

µA in Active Mode

• 0.5

µA in Shutdown Mode

s

Integrated Schottky Diode

s

Integrated PNP Output Disconnect with

Short-Circuit Protection

s

Internal Reference Override Pin

s

16V at 8mA from 3.6V Input

s

12V at 20mA from 5V Input

s

s

Input Range: 2.3V to 10V

s

High Output Voltage: Up to 34V

s

Low Profile (1mm) ThinSOT Package

APPLICATIO S

FEATURES

DESCRIPTIO

TYPICAL APPLICATIO

Micropower Boost

Converter with Integrated Schottky

and Output Disconnect in ThinSOT

January 2003

The LT

with integrated Schottky diode and output disconnect

packaged in an 8-lead low profile (1mm) ThinSOT

small package size, high level of integration, and the use

of tiny SMT components yield a solution size of less than

as well as fast switching speed to allow the use of a chip

inductor and small ceramic capacitors. The internal PNP

disconnects the output load from the input during shut-

down, and also provides output short-circuit protection.

An auxiliary reference input allows the user to override the

internal 1.25V feedback reference with any lower value,

allowing full control of the output voltage during opera-

tion. This device features a low 25

µA quiescent current,

which is further reduced to less than 1

µA in shutdown. A

current limited fixed off-time control scheme conserves

operating current, resulting in high efficiency over a broad

range of operating current. The rugged 36V switch and

output disconnect circuitry allow outputs up to 34V to be

easily generated in a simple boost topology.

, LTC and LT are registered trademarks of Linear Technology Corporation.

s

LCD Bias

s

Handheld Computers

s

Battery Backup

s

Digital Cameras

s

Cellular Phones

CTRL

SHDN

2.3V TO 10V

16V

SW

GND

OUT

CAP

FB

LT3464

L1

22

µH

C1

1

µF

C3

0.22

µF

C2

0.33

µF

3.48M

294k

1

8

7

6

3

5

2

4

3464 TA01a

C1: TAIYO YUDEN LMK107 BJ105MA-T

C2: TAIYO YUDEN GMK212 BJ474MG-T

C3: TAIYO YUDEN GMK212 BJ224MG-T

L1: MURATA LQH32CN220K

ThinSOT is a trademark of Linear Technolgy Corporation

Efficiency

Final Electrical Specifications

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 represen-

tation that the interconnection of its circuits as described herein will not infringe on existing patent rights.

LOAD CURRENT (mA)

90

80

70

60

50

40

30

0.01

1

10

100

3634 TA01b

0.1