CS5165A - 5-Bit Synchronous CPU Buck Controller

The CS5165A synchronous 5-bit NFET buck controller is optimized to manage the power of the next generation Pentium II
processors. It’s V2 control architecture delivers the fastest transient response (100 ns), and best overall voltage regulation in the industry
today. It’s feature rich design gives end users the maximum flexibility to implement the best price/performance solutions for their end
products. The CS5165A has been carefully crafted to maximize performance and
protect the processor during operation. It has a 5-bit DAC on board that holds a±
1.0% tolerance over temperature. Its on board programmable Soft-Start insures a control startup, and the FET nonoverlap circuitry
ensures that both FETs do not conduct simultaneously. The on board oscillator can be programmed up to 1.0 MHz to give
the designer maximum flexibility in choosing external components and setting systems costs.
The CS5165A protects the processor during potentially catastrophic events like overvoltage (OVP) and short circuit. The OVP feature is
part of the V2 architecture and does not require any additional components. During short circuit, the controller pulses the MOSFETs
in a hiccup” mode (3.0% duty cycle) until the fault is removed. With this method, the MOSFETs do not overheat or self destruct.
The CS5165A is designed for use in both single processor desktop and multiprocessor worksta
tion and server applications. The CS5165A’s current sharing capability allows the designer to build multiple parallel
and redundant power solutions for multiprocessor systems. The CS5165A contains other control and protection features such as
Power Good, ENABLE, and adaptive voltage positioning. It is available in a 16 lead SOIC wide body package.

Features:

V2 Control Topology

Dual N-Channel Design

100 ns Controller Transient Response

Excess of 1.0 MHz Operation

5-Bit DAC with 1.0% Tolerance

Power Good Output With Internal Delay

Enable Input Provides Micropower Shutdown Mode

5.0 V and 12 V Operation

Adaptive Voltage Positioning

Remote Sense Capability

Current Sharing Capability

VCC Monitor

Hiccup Mode Short Circuit Protection

Overvoltage Protection (OVP)

Programmable Soft-Start

150 ns PWM Blanking

65 ns FET Nonoverlap Time

40 ns Gate Rise and Fall Times (3.3 nF Load)