FAN1538

www.fairchildsemi.com FAN1538 Dual Channel 1A Low Dropout Linear Regulator with UVLO and Soft-start Features Two independent outputs Load regulation: 0.05% typical Under-voltage lockout and softstart Over Temperature protection T0-252 DPAK, 5-lead SPAK packages Fixed 3.3V and adjustable or fixed 2.5V output General Description The FAN1538 provides two output voltages: a fixed 3.3V ouput and either a fixed 2.5V or adjustable output with 1A output current capability. Refer to Ordering Information for details. Current limit protects against short circuit currents and on chip over temperature circuitry limits the maximum die temperature. Under voltage lockout and softstart circuitry protects against unregulated output voltages when the input voltage is below specification. Applications Hard Disk Drives, CD-Roms Set-top Boxes ADSL line cards Motherboards with multiple supplies Block Diagram FAN1538A V1 VIN = 5V 22µF + VIN NC GND V2 + 22µF + 22µF 2.5V at 1.0A 3.3V at 1.0A FAN1538B V1 VIN = 5V 22 µF GND FB V2 R1 250 22µF R2 1250 1.5V at 1.0A 22µF 3.3V at 1.0A V2 = VREF (1 + R1/R2) REV. 1.0.2 12/17/03 FAN1538 PRODUCT SPECIFICATION Pin Assignments FAN1538PA FRONT VIEW FAN1538PB FRONT VIEW FAN1538DA FRONT VIEW FAN1538DB FRONT VIEW 1 1 2 3 4 5 1 2 3 4 5 2 3 4 5 1 2 3 4 5 V1 V1 V1 FB GND GND NC GND GND V2 V2 V2 V2 NC VIN VIN VIN VIN 5-Lead SPAK ΘJC=2°C/W 5-Lead SPAK ΘJC=2°C/W 5-Lead Plastic TO-252 DPAK ΘJC=3°C/W Tab is GND Pin Descr...