SC1102A
SC1102A is Synchronous Voltage Mode Controller manufactured by SEMTECH.
Synchronous Voltage Mode Controller for Distributed Power Supply Applications
POWER MANAGEMENT Description
The SC1102 and SC1102A 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 SC1102s 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. SC1102s 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 SC1102 operates at a fixed frequency of 200k Hz and the SC1102A at 500k Hz, providing a choice for optimum promise between efficiency, external ponent size, and cost. Two SC1102s can be used together to sequence power up of tele systems. The power good of the first SC1102 connected to the enable of the second SC1102 makes this possible.
SC1102/SC1102A
Features
1.265V reference available 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 14 Pin SOIC lead free package available. 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
Typical Distribut ed P o w er Supply Distributed Po
+5V
+
R1 1k R2 C1 opt. R4 10 C2 0.1 1 U1 SC1102 VCC GND 14 C3 0.1 C5 10.0 C6 680/6.3V C7 680/6.3V C8 680/6.3V
Vin 5V
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PWRGD 2 0.1 OVP...
