AIC1570

AIC1570 5-bit DAC, Synchronous PWM Power Regulator with LDO and Linear Controller FEATURES Compatible with HIP6018. Provides 3 Regulated Voltages for Microprocessor Core, Clock and GTL Power. Simple Voltage-Mode PWM Control. Dual N-Channel MOSFET Synchronous Driver. Operates from +3.3V, +5V and +12V Inputs. Fast Transient Response. Full 0% to 100% Duty Ratios. ±1.0% Output Voltage for VCORE and ±2.0% Output Voltage Reference for VCLK and VGTL. TTL Compatible 5-bit Digital-to-Analog Core Output Voltage Selection. Range from 1.3V to 3.5V. 0.1V Steps from 2.1V to 3.5V. 0.05V Steps from 1.3V to 2.05V. Adjustable Current Limit without External Sense Resistor. Microprocessor Core Voltage Protection against Shorted MOSFET. Power Good Output Voltage Monitor. Over-Voltage and Over-Current Fault Monitors. 200KHz Free-Running Oscillator Programmable up to 350KHz. DESCRIPTION The AIC1570 combines a synchronous voltage mode controller with a low dropout linear regulator and a linear controller as well as the monitoring and protection functions in this chip. The PWM controller regulates the microprocessor core voltage with a synchronous rectified buck converter. The linear controller regulates power for the GTL bus and the linear regulator provides power for the clock driver circuit. An integrated 5 bit D/A converter that adjusts the core PWM output voltage from 2.1V to 3.5V in 0.1V increments and from 1.3V to 2.05V in 0.05V increments. The linear regulator uses an internal driver device ...