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DESCRIPTION

The A8169-025 Series is a fixed frequency, constant current step-up DC/DC converter ideal for driving LEDs used in backlighting applications on cellular phones, PDAs and digital cameras etc. Output voltage of up to 23V can be derived, and from a 3.2V input six white LED’s can be driven in series or alternatively, using a 2.5V input, a network of two parallel legs with three in each may be driven.

Luminance of the LED’s is controlled by changing the duty cycle of a PWM signal applied to the EN pin. In addition, an internal MOSFET with an RDS(ON) of 0.8Ω is used. Allow profile and small board area solution can be achieved using a chip coil and an ultra small ceramic output capacitor (CL) of 0.22uF.

The A8169-025 is available in SOT-26 package.

FEATURES

? Input voltage range: 2.5V~6V

? Output voltage range: up to 23V externally set-up reference voltage 0.25V

? Oscillation frequency: 1.0MHz

? On resistance: 0.8Ω

? Efficiency: 88(When driving 3 white LEDs in series VIN=3.6V ILED=20mA)

? Control: PWM control

? Stand-by Current: ISTB=1.0uA

? Load capacitor: 0.22uF ceramic

? Lx limit Current:1.0A

? Available in SOT-26 package

APPLICATIONS

? For White LED Drivers

? Mobil phones, PHS

? PDAs，GPSs

? Digital still cameras