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BL8501

Step down DC/DC controller

OUTLINE

The BL8501 is a CMOS-based PWM step-down DC-DC Converter controller. The device can

offer the following advantages: lower supply current and wider operating input-voltage range.

The BL8501 consists of an oscillator, a PWM control circuit, a reference voltage unit, an error

amplifier, a soft-start circuit, a protection circuit, a PWM/VFM alternative circuit, a chip enable

circuit, and detecting input voltage circuit. A low ripple, high efficiency step-down DC-DC

converter can be easily composed of this IC with only several external components, or a

power-transistor, an inductor, a diode and capacitors. Output Voltage can be adjusted with

external resistors.

FEATURES

Range of input Voltage: 3.5V~12V

Built-in Soft-start Function and Protection Function (Reset type protection)

Oscillation Frequency: 500KHz

High efficiency: 90%

High Accuracy Output Voltage: 2.0%

Low Temperature-Drift Coefficient of Output Voltage: Typ:

100ppm/擄C

Operating Temperature Range: -20 ~85

APPLICATIONS

Power source for hand-held communication equipment, cameras, video instruments

such as VCRs, camcorders.

Power source for battery-powered equipment.

Power source for household electrical appliances.

PIN CONFIGURATION

SOT-23-5L

PIN DESCRIPTION

Pin No.

1

2

3

4

5

Symbol

CE

GND

V

FB

EXT

V

IN

Description

Chip Enable Pin (Active with 鈥淗鈥?

Ground Pin

Pin for Feedback Voltage

External Transistor Drive Pin (CMOS Output)

Power Supply Pin

DETAILED DESCRIPTION

http://www.belling.com.cn

- 1-

Total

10

Pages

8/8/2006

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