BL8542B Datasheet, PDF (1/6 Pages) SHANGHAI BELLING CO., LTD. – 0.85V startup, 1MHz, 300mA Iout, Synchronous Boost Converter

BL8542B
REV1.2, DEC 2010
0.85V startup, 1MHz, 300mA Iout, Synchronous Boost Converter
DESCRIPTION
The BL8542B is a step-up converter that provides a
boosted output voltage from a low voltage source.
Because of its proprietary design, it starts up at a
very low input voltage down to 850mV, making it
an ideal choice for single cell alkaline/NiMH battery
operations.
A switching frequency of 1MHz minimizes solution
footprint by allowing the use of tiny, low profile
inductors and ceramic capacitors. The current mode
PWM design is internally compensated, reducing
external parts count.
BL8542B is housed in a tiny SOT23-5 and SOT89-3
Package.
TYPICAL APPLICATION CIRCUIT
BL8542B
BL8542B
FEATURES
•• Up to 95% Efficiency
•• Output voltage accuracy 3％
•• 1MHz Switching Frequency allows small inductor
and output cap
•• Input boost-strapping allows using small or no
input cap
•• Low Vin Start-up Voltage down to 850mV Ideal
for Single Alkaline Cell operations
•• Maximum Output Current up to 300mA
•• Low Noise PWM control
•• Internally Compensated Current Mode Control
•• Internal Synchronous Rectifier
•• Logic Control Shutdown (IQ<1uA)
APPLICATIONS
•• One to Three Cell Battery Operated Devices
•• Medical Instruments
•• Bluetooth Headsets
•• Flash-Based MP3 Players
•• Noise Canceling Headphones
PIN CONFIGURATION
NOTE: Input capacitor (Cin=0.47uF) and Output capacitor
(Cout≥4.7uF) are recommended in all application circuit.
ORDERING INFORMATION
Product
BL8542B-ADJ
Product Code
BL8542BCB5TR
BL8542B-3.3V
BL8542BCB5TR33
BL8542B-5.0V
BL8542BCB5TR50
BL8542B-3.3V
BL8542BCC3TR33
Package
SOT23-5
SOT23-5
SOT23-5
SOT89-3
BL8542B-5.0V
BL8542BCC3TR50
SOT89-3
BL8542B
SOT23-5
Devices per Reel
3000
3000
3000
1000
1000
BL8542B
3 SW
2 OUT
1G
SOT89-3
Top Marking
AAXZ
AAWZ
AAVZ
AAWZ
XXXX
AAVZ
XXXX
XXXX:The last 4 characters of the LOT NO.
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