RT9227A

Features:

3-in-one Regulated Voltages for Microprocessor
Core, Clock, and GTL
Compatible with HIP6016
Power-good Output Voltage Monitor
Switching section
5-bit DAC Programmable from 1.3V to 3.5V
±1% DAC Accuracy
Fast Transient Response
Full 0% to 100% Duty Cycle Driver
Fixed 200kHz Switching Frequency
Adaptive Non-overlapping Gate Driver
Over-current Monitor Uses MOSFET RDS(ON)
Over-voltage Protection Uses Lower MOSFET
Linear Section
Fixed Linear Regulator Output Voltage
MOSFET or NPN Driving Capability
Ultra Fast Response Speed
Under-voltage Protection
Internal Thermal Shutdown




Application

Full Motherboard Power Regulation for Computer
Low-voltage Distributed Power Supplies




Pinout



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Specifications

Supply Voltage +15V
PGOOD and GATE Voltage GND −0.3V to V_CC+0.3V
Input, Output or I/O Voltage GND− 0.3V to 7V
Ambient Temperature Range 0°C to +70°C
Junction Temperature Range 0°C to +125°C
Storage Temperature Range-65°C to +150°C
Lead Temperature (Soldering, 10 sec.)300°C
Package Thermal Resistance
SOP-24,_JA 75°C/W




Description

The RT9227A is a 3-in-one power controller optimized for high-performance microprocessor and computer applications. The IC integrates a synchronous buck PWM controller, a linear regulator and a linear controller as well as monitoring and protection functions into a 24-pin SOP package. The PWM controller regulates the microprocessor core voltage. The linear regulator provides power for the clock driver circuit and the linear controller regulates power for the GTL bus.

The RT9227A features an Intel-compatible, TTL 5-bit programmable DAC that adjusts the core voltage from 2.1V to 3.5V in 0.1V increments and from 1.3V to 2.05V in 0.05V steps. The 5-bit DAC has a typical ±1% tolerance. The linear regulator uses an internal drive device to provide a fixed 2.5V ±2.5% output voltage. The linear controller drives an external Nchannel MOSFET or a low cost NPN bipolar transistor to provide a fixed 1.5V ±2.5%.

The RT9227A monitors all the output voltages. A 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. Additional buildin over-voltage protection for the core output uses the lower MOSFET to prevent output voltage above 115% of the DAC setting. The PWM over-current function monitors the output current using the voltage drop across the upper MOSFET's RDS(ON), which eliminates the need for a current sensing resistor.

The RT9227A is a 3-in-one power controller optimized for high-performance microprocessor and computer applications. The IC integrates a synchronous buck PWM controller, a linear regulator and a linear controller as well as monitoring and protection functions into a 24-pin SOP package. The PWM controller regulates the microprocessor core voltage. The linear regulator provides power for the clock driver circuit and the linear controller regulates power for the GTL bus.
The RT9227A features an Intel-compatible, TTL 5-bit programmable DAC that adjusts the core voltage from 2.1V to 3.5V in 0.1V increments and from 1.3V to 2.05V in 0.05V steps. The 5-bit DAC has a typical ±1% tolerance. The linear regulator uses an internal drive device to provide a fixed 2.5V ±2.5% output voltage. The linear controller drives an external N-Channel MOSFET or a low cost NPN bipolar transistor to provide a fixed 1.5V ±2.5%.
The RT9227A monitors all the output voltages. A 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. Additional build-in over-voltage protection for the core output uses the lower MOSFET to prevent output voltage above 115% of the DAC setting. The PWM over-current function monitors the output current using the voltage drop across the upper MOSFET's R_DS(ON), which eliminates the need for a current sensing resistor.