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