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SC2602STRT Datasheet(PDF) 1 Page - Semtech Corporation |
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SC2602STRT Datasheet(HTML) 1 Page - Semtech Corporation |
1 / 16 page POWER MANAGEMENT 1 www.semtech.com SC2602/SC2602A Synchronous Voltage Mode Controller for Distributed Power Supply Applications Features Applications Revision: November 18, 2004 Typical Application Circuit Description Synchronous operation for high efficiency (95%) R DS(ON) current sensing On-chip power good and OVP functions Small size with minimum external components Soft Start Enable function Microprocessor core supply Low cost synchronous applications Voltage Regulator Modules (VRM) DDR termination supplies Networking power supplies Sequenced power supplies 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 effi- ciency 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 compensated voltage reference, triangle wave oscillator and current sense comparator circuitry. Power good signaling, shut- down, and over voltage protection are also provided. The SC2602 operates at a fixed 200kHz and the SC2602A at 500kHz, providing a choice for optimum compromise between efficiency, external component size, and cost. Two SC2602s can be used together to sequence power up of telecom systems. The power good of the first SC2602 connected to the enable of the second SC2602 makes this possible. Typical Distributed Power Supply Figure 1. VCC 1 PWRGD 2 OVP 3 OCSET 4 PHASE 5 DRVH 6 PGND 7 DRVL 8 BSTL 9 BSTH 10 SENSE 11 SS/SHDN 13 GND 14 U1 SC2602 Q1 STP40NE Q2 STP40NE R5 3.9 L1 2uH C9 180/4V C10 180/4V C11 180/4V C12 180/4V C7 680/6.3V C6 680/6.3V R1 1k R3 1k C2 0.1 C3 0.1 C1 0.1 R2 PWRGD OVP SHDN + _ + _ Vin 5V Vout=2.5V * R7 127 R8 124* NOTE: *) Vout = 1.265 x (1+R8/R7) +5V D1 MBR0520 R6 2.2 C4 1.0 C5 10.0 C8 680/6.3V R4 10 +12V C13 180/4V 0.1 COMP 12 4.99K 820pF |
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