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ILC6381

SOT-89 Step-up Dual-Mode Switcher with Shutdown

Fairchild Semiconductor 

www.fairchildsemi.com

ILC6380/81

SOT-89 Step-up Dual-Mode Switcher with Shutdown

Features

• 85% efficiency at 50mA

• Start-up voltages as low as 900mV

• ±2.5% accurate outputs

• Complete switcher design with only 3 external

components

• 50, 100 and 180kHz switching frequency versions

available

• Shutdown to 0.5µA Iq

• External transistor option allows several hundred

milliamp switcher design

Applications

• Cellular Phones, Pagers

• Portable Cameras and Video Recorders

• Palmtops and PDAs

Description

100mA boost converter in 5-lead SOT-89 package using both

PFM and PWM conversion techniques. In normal operation

the ILC6380 runs in PWM mode running at one of three fixed

frequencies. At light loads the ILC6380 senses when the duty

cycle drops to approximately 10%, and automatically

switches into a power-saving PFM switching technique. This

maintains high efficiencies both at full load and in system

sleep conditions.

Only 3 external components are needed to complete the

switcher design, and standard voltage options of 2.5, 3.3, and

5.0V at ±2.5% accuracy feature on-chip phase compensation

and soft-start design.

ILC6381 drives an external transistor for higher current

switcher design, with all of the features and benefits of the

ILC6380.

Typical Applications

SD

L

3

2

1

CE

VOUT

ILC6380

+

VIN

CL

4

5

GND

Figure 1:

L: 100µH (SUMIDA, CD-54)

SD: Diode (Schottky diode; MATSUSHITA MA735)

CL: 16V 47µF (Tantalum Capacitor; NICHICON, F93)

L

SD

3

2

1

CE

VOUT

VIN

ILC6381

CB

+

CL

4

5

Tr

RB

GND

Figure 2:

L: 47µH (SUMIDA, CD-54)

SD: Diode (Schottky diode; MATSUSHITA MA735)

CL: 16V 47µF (Tantalum Capacitor; NICHICON, F93)

RB: 1kW

CB: 3300pF

Tr: 2SC3279, 2SDI628G

Rev. 1.5

©2001 Fairchild Semiconductor Corporation

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