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M

Features

鈥?High Efficiency at Low Output Load Currents via

PFM Mode

鈥?Assured Start-up at 0.9V

鈥?80 碌A (Typ) Supply Current

鈥?85% Typical Efficiency at 100 mA

鈥?140 mA Typical Output Current @ V

IN

=

2.0V

鈥?Low Power Shutdown Mode

鈥?No External Switching Transistor Needed

鈥?Space-Saving SOT-89 Package

TC115

Package Type

SOT-89-5

PS

5

GND

TC115

NC

1

PS

2

SHDN

3

4

LX

PFM/PWM Step-Up DC/DC Converter

Applications

鈥?/div>

Pagers

Cellular Phones

Palmtops

1-Cell to 3-Cell Battery Powered Systems

Cameras, Video Recorders

Local +3V to +5V Supplies

General Description

The TC115 is a high-efficiency step-up DC/DC

converter for small, low input voltage or battery-

powered systems. This device has a start-up voltage

of 0.9V and a typical supply current of 80 碌A. Phase

compensation and soft-start circuitry are included on-

chip. Unlike conventional PWM step-up converters,

the TC115 automatically shifts to pulse frequency

modulation (PFM) at low loads, resulting in reduced

supply current and improved efficiency.

The TC115 requires only an external diode, an inductor

and a capacitor, while supporting typical output cur-

rents of 140 mA. Supply current is reduced to less than

0.5 碌A (max) when SHDN input is brought low.

Small size, low installed cost and low supply current

make the TC115 step-up converter ideal for use in a

wide range of battery-powered systems.

Functional Block Diagram

L

1

100 碌H

Sumida

廬

CD-54

+

1.5V

+

C

1

10 碌F

D

1

IN5817 +

C

2

47 碌F

Tantalum

+3V

OUT

PS

5

GND

4

LX

TC115

NC

1

PS

2

SHDN

3

1.5V to +3V, 50 mA Supply

錚?/div>

2003 Microchip Technology Inc.

DS21361C-page 1

型號

版本

描述

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