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 auto-

matically switches into a power-saving PFM switching tech-

nique. 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 com-

pensation and soft-start design.

ILC6381 drives an external transistor for higher current switch-

er design, with all of the features and benefits of the ILC6380.

ILC6380/81

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

Impala Linear Corporation

Impala Linear Corporation

1

(408) 574-3939

www.impalalinear.com

Sept 1999

ILC6380/1 1.4

! 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 I

q

! External transistor option allows several hundred

milliamp switcher design

! Cellular Phones, Pagers

! Portable Cameras and Video Recorders

! Palmtops and PDAs

SOT -89-5

(TOP VI EW)

13

2

V

OUT

CE

L

X

4

5

V

SS

N/C

SOT -89-5

(TOP VI EW)

13

2

V

OUT

CE

EXT

4

5

N/C

ILC6380CP-25

2.5V ± 2.5%@50kHz

ILC6380CP-33

3.3V ± 2.5%@50kHz

ILC6380CP-50

5.0V ± 2.5%@50khz

ILC6380CP-25

2.5V ± 2.5%@100kHz

ILC6380CP-33

3.3V ± 2.5%@100kHz

ILC6380CP-50

5.0V ± 2.5%@100kHz

ILC6380CP-25

2.5V ± 2.5%@180kHz

ILC6380CP-33

3.3V ± 2.5%@180kHz

ILC6380CP-50

5.0V ± 2.5%@180kHz

ILC6381CP-25

2.5V ± 2.5%@50kHz, external xtor

ILC6381CP-33

3.3V ± 2.5%@50kHz, external xtor

ILC6381CP-50

5.0V ± 2.5%@50kHz, external xtor

ILC6381BP-25

2.5V ± 2.5%@100kHz, external xtor

ILC6381BP-33

3.3V ± 2.5%@100kHz, external xtor

ILC6381BP-50

5.0V ± 2.5%@100kHz, external xtor

ILC6381AP-25

2.5V ± 2.5%@180kHz, external xtor

ILC6381AP-33

3.3V ± 2.5%@180kHz, external xtor

ILC6381AP-50

5.0V ± 2.5%@180kHz, external xtor

V

PWM/ PFM Controll ed

BUFFER

EXT

+

-

CHI P ENABLE

OSC

50/ 100/180KHz

V

DD

V

OUT

CE

Phase com p

V

re f

Slow Start

V

DD

is i nternall y connected to the V

1000 per reel, orientation right for SOT-89

General Description

Package Features

Applications

Block Diagram

Pin Package Configurations

Ordering Information