A8503
Ultra-Small WLED/RGB Driver for Medium Displays
Contact Sales for more information.
Features
zActive current sharing between LED strings for tight current matching and accuracy
zDrive up to 10 series, 6 parallel LEDs, (Vf = 3.7 V max, If = 25 mA).
zBoost converter with integrated 50 V DMOS
zLED sinks rated for 25 mA
zPWM dimming with LED duty cycle control
zOpen LED protection
zShort LED string protection
zBoost current limit, OTP and soft start.
zOver Voltage Protection and open diode protection.
zInput UVLO protection
zLatch or Auto restart fault mode
zPACKAGE: 4 mm × 4 mm MLP-26
Applications
zLED backlight displays
Description
A8503 is a multi-output WLED/RGB driver for medium size display backlighting. The A8503 integrates a boost
converter and 6 current-sinks to provide a WLED/RGB driver. It can work from single power supply 4.3 to 5.5 V.
The boost converter can drive up to 60 LEDs at 20 mA per LED at 5 V battery voltage. The boost converter is
constant frequency current mode converter. The integrated boost DMOS switch is rated for 50 V, 2 A.
PWM dimming allows LED currents to be controlled in 500:1 ratio.
A8503 provides protection against over voltage, open diode, open and short LED string, over temperature, pulse by
pulse switch current limit and short circuit. With MODE pin low, IC latches on fault and can be re-enabled only by
recycling input voltage Vin or toggling EN pin. When MODE pin connected to Vin, IC autorestart.
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Complete Part Numbers
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Allegro's products are not to be used in life support devices or systems, if a failure of an Allegro product
can reasonably be expected to cause the failure of that life support device or system, or to affect the safety
or effectiveness of that device or system.
Copyright © 2008 Allegro MicroSystems, Inc. • 115 Northeast Cutoff, Worcester, MA 01606 USA •
Phone: 1.508.853.5000 • Fax: 1.508.853.7895
Part Number Package Type RoHS
Compliant Part Composition/
RoHS Data Temperature Comments Samples Distributor Stock
A8503EECTR-T 26-lead QFN/MLP Yes view data -40 °C to 85 °C new Contact
Marketing
Representative
Check Stock
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