SC2602A Datasheet | SEMTECH

Description The SC2602 and SC2602A are low-cost, full featured, synchronous voltage-mode controllers designed for use in single ended power supply applications where efficiency is of primary concern. Synchronous operation allows for the elimination of heat sinks in many applications. The SC2602s are ideal for implementing DC/DC converters needed to power advanced microprocessors in low cost systems, or in distributed power applications where efficiency is important. Internal level-shift, high-side drive circuitry, and preset shoot-thru control, allows the use of inexpensive N-channel power switches. SC2602s Features include temperature pensated voltage reference, triangle wave oscillator and current sense parator circuitry. Power good signaling, shutdown, and over voltage protection are also provided. The SC2602 operates at a fixed 200k Hz and the SC2602A at 500k Hz, providing a choice for optimum promise between efficiency, external ponent size, and cost. Two SC2602s can be used together to sequence power up of tele systems. The power good of the first SC2602 connected to the enable of the second SC2602 makes this possible. SC2602/SC2602A Features ‹ ‹ ‹ ‹ ‹ ‹ Synchronous operation for high efficiency (95%) RDS(ON) current sensing On-chip power good and OVP functions Small size with minimum external ponents Soft Start Enable function Applications ‹ Microprocessor core supply ‹ Low cost synchronous applications ‹ Voltage Regulator Modules (VRM) ‹ DDR termination supplies ‹ Networking power supplies ‹ Sequenced power supplies Typical Application Circuit Typical Distributed Power Supply +5V + R1 1k R2 C1 0.1 R4 10 C2 0.1 1 U1 SC2602 VCC GND 14 C3 0.1 4.99K 820p F C5 10.0 C6 680/6.3V C7 680/6.3V C8 680/6.3V Vin _ 5V PWRGD 2 0.1 OVP R3 1k PWRGD SS/SHDN 13 SHDN 12 R8 124- R7 127 OCSET SENSE 5 D1 MBR0520 PHASE BSTH 10 C4 1.0 +12V Q1 STP40NE R5 3.9 R6 2.2 Q2 STP40NE L1 2u...