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/°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 “H”)
Ground Pin
Pin for Feedback Voltage
External Transistor Drive Pin (CMOS Output)
Power Supply Pin
DETAILED DESCRIPTION
http://www.belling.com.cn
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Total
10
Pages
8/8/2006
BELLING [ SHANGHAI BELLING CO., LTD. ]
