BL8542B
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.
REV1.2, DEC 2010
0.85V startup, 1MHz, 300mA Iout, Synchronous Boost Convert
er
FEATURES
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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
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One to Three Cell Battery Operated Devices
Medical Instruments
Bluetooth Headsets
Flash-Based MP3 Players
Noise Canceling Headphones
TYPICAL APPLICATION CIRCUIT
BL8542B
BL8542B
PIN CONFIGURATION
3
SW
BL8542B
BL8542B
2 OUT
1
G
NOTE: Input capacitor (Cin=0.47uF) and Output capacitor
(Cout≥4.7uF) are recommended in all application circuit.
SOT23-5
SOT89-3
ORDERING INFORMATION
Product
Product Code
Package
Devices per Reel
Top Marking
BL8542B-ADJ
BL8542B-3.3V
BL8542B-5.0V
BL8542B-3.3V
BL8542B-5.0V
BL8542BCB5TR
BL8542BCB5TR33
BL8542BCB5TR50
BL8542BCC3TR33
BL8542BCC3TR50
SOT23-5
SOT23-5
SOT23-5
SOT89-3
SOT89-3
3000
3000
3000
1000
1000
AAXZ
AAWZ
AAVZ
AAWZ
XXXX
AAVZ
XXXX
XXXX:The last 4 characters of the LOT NO.
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