SC2602L
SC2602L is Synchronous Voltage Mode Controller manufactured by SEMTECH.
Description
The SC2602L is low-cost, full featured, synchronous voltage-mode controller 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 SC2602L is 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-through control, allows the use of inexpensive N-channel power MOSFETs. SC2602L 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 SC2602L operates at a fixed 200k Hz which is for optimum promise between efficiency, external ponent size, and cost. Two SC2602L can be used together to sequence two voltage regulators for power up in tele systems. The power good of the first SC2602L connected to the enable of the second SC2602L makes this possible.
Features
Synchronous operation for high efficiency (95%) R DS(ON) current sensing Output voltage can be programmed as low as 0.8V On-chip power good and OVP functions Small size with minimum external ponents Soft Start Enable function SO-14 package is fully WEEE and Ro HS pliant
Applications
Microprocessor core supply Low cost synchronous applications Voltage Regulator Modules (VRM) DDR termination supplies Networking power supplies Sequenced power supplies
Typical Application Circuit
V_pullup
5V IN
R1 R3 C1 C3 U1 C5 C6 1 2 PWRGD R4 OVP 3 4 5 6 D1 7 VCC GND 14 13 12 11 10 9 C8 8 Q2 R6 + C10 R7 R8 C9 R5 C7 Q1 12V IN L1 C4 SS/SHDN R2 + C2
PWRGD SS/SHDN OVP OCSET PHASE DH PGND SC2602L P SENSE BSTH BSTL DL
2.5V OUT
Figure 1. Typical distributed power supply
Revision: January 05, 2006 1 .semtech.
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