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BL8548

Description
Max. 3MHz, Variable Frequency Step-up DC-DC Converter
File Size377KB,6 Pages
Manufacturer
Download Datasheet View All

BL8548 Overview

Max. 3MHz, Variable Frequency Step-up DC-DC Converter

BL8548
Max. 3MHz, Variable Frequency Step-up DC/DC Converter
DESCRIPTION
The BL8548 variable frequency step-up Converter
drives white LEDs with a constant current to
provide backlight in cell phones, PDAs, and other
hand-held devices. It features allowing series
connection of the white LEDs so that the LED
currents are identical for uniform brightness. An
enable input can be pulsed repeatedly to adjust
LEDs brightness. The fast 3MHz operation
frequency allows for smaller capacitor and
inductor. Fault condition protection uses cycle-by
cycle current limiting to sense maximum inductor
current and over-voltage protection. The 0.2V
low reference voltage minimized the power loss
across the current sense resistor.
The converter can operate from 2V to 6V, and
capable of delivering maximum 250mA output
current at 4-LEDs application with 3V input
voltage. Quiescent current drawn from power
source is as low as 120uA. All of these features
make BL8548 be suitable for the portable devices,
which are supplied by a single battery.
BL8548 is available in SOT23-6 package that is PB
free.
FEATURES
Up to 19V Output Voltage
Wide Operation Range: 2V to 6V
Maximum 3MHz Operating Frequency
PWM Dimming Control
Shutdown Current <1uA
Current Limit Cycle-by-Cycle
Low Current Sense Threshold: 200mV
19V Over Output Voltage Protection
Compact SOT23-6 Package
APPLICATIONS
Compact Back Light Module
Power Source for LED
Constant Current Source
TYPICAL APPLICATION
BL8548
Figure1. BL8548 Typical Application Circuit
www.belling.com.cn
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