SC1402 Datasheet | SEMTECH

DESCRIPTION The SC1402 is pin patible with the MAX1632 with improved load regulation performance. The SC1402 is a multiple-output power supply controller designed to power logic supply ponents in battery operated systems. The SC1402 utilizes synchronous rectified buck topologies to generate two voltages, (3.3V and 5V) with up to 95% efficiency. It also provides two linear regulators for system housekeeping functions. The 12V linear regulator output is generated from a coupled inductor of the 5V switching regulator. Control functions include: power up sequencing, soft start, power-good signaling, automatic bootstrapping for high side MOSFETs, and frequency synchronization. An internal precision 2.5V reference ensures ±2% output voltage. The internal oscillator can be adjusted to 200k Hz, 300k Hz or synchronized to an external clock. The MOSFET drivers provide 1A peak drive current for fast MOSFET switching. The SC1402 includes a PSAVE enable input to select a pulse skipping mode for high efficiency or a fixed frequency mode for low noise operation. Features - = 6V to 30V Input range - = 3.3V and 5V dual synchronous rectified outputs - = Fixed frequency or PSAVE for maximum efficiency - = - = - = - = - = - = - = - = - = - = over wide load current range 5V/50m A linear regulator 12V/120m A linear regulator Precision 2.5V reference output Programmable power-up sequence Power good output (RESET) Output over current protection Output over voltage protection Output under voltage shut down 4µA typical shut down current 7m W typical quiescent power APPLICATIONS - = Notebook and subnotebook puters - = PDAs and Mobile municators - = Desktop DC-DC converters ORDERING INFORMATION: DEVICE SC1402ISS PACKAGE (1) TEMP. (TA) -40 - +85°C SSOP-28 TYPICAL APPLICATION CIRCUIT Note: (1) Only available in tape and reel packaging. (Suffix ‘.TR’). 1 © 2000 SEMTECH CORP. 652 MITCHELL ROAD NEWBURY PARK CA 91320 Multi-Output, Low-Noise Power Supply Controller for Notebook puters December 15,...