AL5801

Datasheet

AL5801
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Description

The AL5801 combines a 100V N-channel MOSFET with a prebiased NPN transistor to make a simple, small footprint LED driver. The LED current is set by an external resistor connected from REXT pin (4) to GND pin (6). The internal pre-biased transistor develops approximately 0.56V across the external resistor. The AL5801 open-drain output can operate from 1.1V to 100V enabling it to operate 5V to 100V power supplies without additional components. PWM dimming of the LED current can be achieved by driving the BIAS pin (1) with an external, open-collector NPN transistor or open-drain N-channel MOSFET. The AL5801 is available in a SOT26 package and is ideal for driving LED currents up to 350mA.

Features and Benefits

• Feedback pin reference voltage V_RSET = 0.56V at +25ºC
• -40 to +125ºC temperature range
• 1.1V to 100V open-drain output
• Negative temperature V_RSET co-efficient automatically reduces
the LED current at high temperatures
• Lead-Free Finish; RoHS Compliant
• Halogen and Antimony Free. “Green” Device
• Low thermal impedance SOT26 package with copper lead frame

Applications

• Linear LED Drivers
• LED Signs
• Offline LED Luminaries

Part Number	AL5801
Topology	Linear LED Driver
Minimum Supply Voltage V	5
Maximum Supply Voltage V	100
Max. VOUT V	100
LED Current Sense Voltage mV	560
Output Current mA	350
LED Current mA	350
Accuracy %
Frequency kHz
Efficiency %
Dimming	Yes
Temperature Range ºC	-40 to +125

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