BL8523
PWM/PFM Step-down DC-DC Controller
DESCRIPTION
The BL8523 is a CMOS-based PWM step-down
DC-DC Controller. The device offers the following
advantages: lower supply current and wider
operating input-voltage range.
The BL8523 consists of an oscillator, a PWM
control circuit, a reference voltage unit, an error
amplifier, a soft-start circuit, a protection circuit,
a PWM/PFM alternative circuit, a Chip Enable
circuit, and under voltage lockout circuit. A low
ripple, high efficiency step-down DC-DC converter
can be easily composed of this IC. Output Voltage
can be adjusted with external resistors.
The BL8523 uses voltage type PWM/PFM mixed
operation mode. When the load current is small,
the operation will switch into the PFM mode
from PWM mode. Therefore the efficiency at
small load is improved, and then the chip works
on PWM mode.
The BL8523 embeds reset type protection circuit.
If the term of maximum duty cycle keeps on a
certain time, the protection circuit restarts the
operation with soft-start and repeat this
operation until maximum duty cycle condition is
released. When the cause of large load current is
removed, the chip returns to normal condition.
FEATURES
Range of Input Voltage: 3V~16V
Built-in Soft-start Function and Protection
Function(Reset type protection)
<1μA Shutdown Current and 80uA Quiescent
Current
Oscillation Frequency: 500KHz
High efficiency: 95%
High Accuracy Output Voltage:±2.0%
Low Temperature Coefficient: ±100ppm/°C
Operating Temperature Range: -40°C ~85°C
Small Package:SOT23-5
Demo Board Available
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
appliance
ORDERING INFORMATION
BL8523CB5TR
Code
BL8523
C
B5
TR
Description
Product code
Temperature & Rohs:
C: -40~85C, Pb Free Rohs Std.
Package Type: SOT23-5
Tape & Reel (Standard), 3000pcs/Reel
PIN CONFIGURATION
Product ID
Marking
HE
Y
W
Product Code
Year
Week
BL8523CB5TR
5
HEYW
1
2
4
3
www.belling.com.cn
1
BELLING [ SHANGHAI BELLING CO., LTD. ]
