Vishay Siliconix

SiP12506

Document Number: 73861

S-70547–Rev. D, 26-Mar-07

www.vishay.com

1

1-MHz Boost Converter with OVP for White LED Applications

FEATURES

•

Output Voltage Range up to 20 V

•

FB Voltage of 0.208 V

•

Cycle-By-Cycle Current Limiting with Internal

Frequency Compensation

•

2.6 V to 9 V Input Voltage Range

•

1 MHz Switching Frequency

•

> 90 % efficiency

•

•

1.6 A Switch Current Limit

•

< 1 µA Low Shutdown Current

•

Internal Soft-Start Control

•

Thermal Shutdown Protection (160 °C)

APPLICATIONS

•

CCD Bias Supplies

•

TFT-LCD Displays

•

OLED Driver

•

White LED Backlight

•

Digital Cameras

•

Portable Phones and Game Devices

DESCRIPTION

The SiP12506 is a 1 MHz current-mode boost converter with

a feedback voltage of 0.208 V which offers small size and

high power conversion efficiency. Its input voltage range is

from 2.6 V to 9 V, and output voltage can go up to 20 V. The

internal frequency compensation minimizes number of exter-

nal components. The integrated 28 V power switch can carry

up to 1.6 A easily providing for 200 mA load current from a

3.6 V input supply. These features make the SiP12506 the

ideal. The internal soft-start circuit controls the rate of rise of

the output voltage during start-up to prevent overshoot. The

logic-level shutdown pin can be used to reduce quiescent

current to < 1 µA and, effectively, extend battery life. Thermal

shutdown at 160 °C is also included. The low FB voltage of

0.208 V improves the overall circuit efficiency. These fea-

tures and more, make the SiP12506 an ideal power solution

to white LED, OLED, LCD, and CCD applications operating

from a single or dual cell lithium-ion battery.

SiP12506 is available in 6-pin MLP33 package and is spec-

ified to operate over the industrial temperature range of

- 40 °C to 85 °C.

TYPICAL APPLICATION CIRCUIT

Figure 1. SiP12506 Typical Application Circuit

SHD

LX

FB

GND

SiP12506

SHD

1 µF

10 µH

Cout

1 µF

MBR0530

1

6

4

3

5

2

10.5

0. 208 V

L

Figure 2. Efficiency Curve

40

45

50

55

60

65

70

75

80

85

90

95

100

0

50

100

150

200

250

300

Load Current (mA)

V

= 13 V

OUT

V

= 3.3 V

IN

V

= 5 V

IN

V

= 7.2 V

IN

RoHS

COMPLIANT