Power Electronics

Two-Channel LED Driver for LED Indicators and LCD or Keyboard Backlighting

Advanced Analogic Technologies Incorporated announced the AHK3292, a two-channel LED driver for LED indicators and LCD or keyboard backlighting in entry level mobile products. Featuring low resistance current sinks capable of supporting a low dropout voltage, the new LED driver reduces power dissipation and extends battery life. The device's dropout voltage of 36 mV typical is at least 20% lower than competitive products.

Operating directly off a 2.7V to 5.5V input supply, the AHK3292 drives up to two LEDs. This 1X driver IC is ideal for driving LEDs with a low forward voltage drop. Low resistance, low dropout voltage current sinks allow the LEDs to operate close to the input supply voltage eliminating the need for an additional boost converter and extending battery life.

Maximum LED current is set by an external resistor (Rset) that enables designers to optimize linearity and provide smoother control. Full scale LED current can be set to an upper limit of 30.2 mA. LED output current accuracy is +/- 10%. LED output current matching is +/-3%. The AHK3292 also features a low current shutdown mode.

The output current for each LED is enabled, disabled and controlled by AnalogicTech's Simple Serial Control (S2Cwire) interface. By replacing PWM control circuitry, this 32-step single-wire bus reduces the overhead on the system microcontroller, minimizes LED flicker through constant-current digital control, and reduces noise control, and reduces noise.

Qualified over a -40 to +85 ºC temperature range, the AHK3292 is available in a Pb-free 6-pin SOT23 package. It sells for $0.39 in 1K quantities

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