AIC1573

Features:

3V to 30V Input Voltage Operation.
Internal 2A Peak Current Switch.
1.5A Continuous Output Current.
Bootstrapped Driver.
High Side Current Sense Capability.
High Efficiency (up to 90%).
Internal 2% Reference.
Low Quiescent Current at 1.6mA.
Frequency Operation from 100Hz to 100KHz.




Application

LCD Display
Portable DVD
Network Equipment
Constant Current Source for Battery Chargers.
Saver for Cellular phones.
Step-Down DC-DC Converter Module.

Pinout






Specifications

Supply Voltage, V_CC ......................................................................................+15V
PGOOD, FAULT and GATE Voltage.....................................GND -0.3V to VCC +0.3V
Input, Output , or I/O Voltage .....................................................GND -0.3V to 7V
Recommended Operating Conditions
Supply Voltage; V_CC.....................................................+12V±10%
Ambient Temperature Range.........................................0°C~70°C
Junction Temperature Range.......................................0°C~125°C
Thermal Information
Thermal Resistance, _JA
SOIC package....................................................................70°C/W
SOIC package (with 3in² of copper)..................................50°C/W
Maximum Junction Temperature (Plastic Package) .......................................150°C
Maximum Storage Temperature Range ...........................................-65°C ~ 150°C
Maximum Lead Temperature (Soldering 10 sec) ............................................300°C




Description

The AIC1573 combines two PWM voltage mode controllers and two linear controllers as well as the monitoring and protection functions in this chip. One PWM controller regulates the microprocessor core voltage with a synchronous rectified buck converter. The second PWM controller provides AGP bus 1.5V or 3.3V power with a standard buck converter. Two linear controllers regulate power for the 1.5V GTL bus and 1.8V power for the chip set core voltage and/or cache memory circuits.An integrated 5 bit D/A converter that adjusts the microprocessor core voltage from 2.1V to 3.5V in 0.1V increments and from 1.3V to 2.05V in 0.05V increments. The second PWM controller for AGP bus power is selectable by means of SELECT pin status for 1.5V or 3.3V with 3% accuracy. Two linear controllers drive with external N-channel MOSFETs to provide 1.5V±3% and fixed output voltage 1.8V±3% for AIC1573.

AIC1573 chip monitors all the output voltages. Power Good signal is issued when the core voltage is within ±10% of the DAC setting and the other levels are above their under-voltage levels. Over-voltage protection for the core output uses the lower Nchannel MOSFET to prevent output voltage above 116% of the DAC setting.The PWM over-current function monitors the output current by using the voltage drop across the upper MOSFET's R _DS(ON) , eliminating the need for a current sensing resistor.