Vishay Siliconix

SiP12502

Document Number: 73578

S09-1456-Rev. B, 03-Aug-09

www.vishay.com

1

500 mA - Fixed Output Boost Converter for Single or Dual Cell

DESCRIPTION

SiP12502 is a boost converter IC with fixed output voltage for

single or double cell NiMH or Alkaline battery pack. Featuring

with an internal low resistance power MOSFET, it is capable

of starting up with a low battery voltage of 0.85 V. It only

needs four external components (an inductor, a diode and

two capacitors) to construct a step-up converter. For best

efficiency performance, it is designed to operate in PWM

mode with a 300 kHZ switching frequency under normal load

and in PFM mode under light load. The voltage-mode control

loop is internally compensated, simplifying converter design

and reducing external parts count. It accepts input voltages

from 0.85 V to 5 V, providing fixed output voltages of 2.0 V,

3.3 V, and 5.0 V. It also features low shutdown current of

under 1 µA, over voltage protection, thermal shutdown

protection, a power good output and antiringing control to

minimize EMI.

SiP12502 is available in a lead (Pb)-free 6-pin, PowerPAK

MLP33 package and is specified to operate over the

industrial temperature range of - 40 °C to 85 °C.

FEATURES

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Voltage mode control with internal frequency

compensation

•

0.85 V to 5.0 V input voltage range

•

Fixed output voltage options - 2.0 V, 3.3 V, and 5.0 V

•

Other voltages available upon request

•

PWM control with 300 kHz fixed switching frequency

•

PFM control for light load

•

Powered from the output voltage supply

•

Integrated UVLO and soft-start

•

Logic controlled shutdown (< 1 µA)

•

85 % typical efficiency

•

Internal power MOS switch: 0.2

Ω at 3.3 V output

•

Antiringing switch to minimize EMI

•

Power good output

•

Shutdown input

•

Minimum external components

•

•

Over voltage protection

APPLICATIONS

•

Portable applications

•

Battery-powered equipment

•

Handheld devices

•

Digital cameras

•

Wireless handsets

•

LCD and OLED bias

TYPICAL APPLICATION CIRCUIT

XSHD

LX

SiP12502

PGOOD

GND

1

3

6

4

2

5

10 µH

XSHD

10 µF

47 µF

MBR0520

330 K

Ω

PGOOD