APW7045 Datasheet, PDF (1/12 Pages) Anpec Electronics Coropration – Advanced PWM and Linear Power Controller

APW7045
Advanced PWM and Linear Power Controller
Features
General Description
• 2 Regulated Voltage are provided
−Switching Power for Fixed Voltage (1.0V)
−Linear Regulator for VMEM(2.5V)
• Simple Single-Loop Control Design
−Voltage-Mode PWM Control
• Excellent Output Voltage Regulation
−PWM Output: ±1%
−Linear Output: ±3%
• Fast Transient Response
−High-Bandwidth Error Amplifier
−Full 0% to 100% Duty Ratio
• Power-Good Output Voltage Monitor
• Over-Voltage and Over-Current Fault Monitors
• Small Converter Size
−200KHz Free-Running Oscillator ;
Progammable from 50KHz to 800KHz
−Reduce External Component Count
The APW7045 integrates PWM controller and linear
controller, as well as the monitoring and protection
functions into a single package, which provides two
controlled power outputs with over-voltage and over-
current protections. The PWM controller regulates
the DDR termination voltage (1.25V) or GPU Voltage
(2.05V) with a synchronous-rectified buck converter.
The linear controller regulates the Memory Voltage
(2.5V). The pre cision reference and voltage-mode
PWM control provide ±1% static regulation. The lin-
ear controller drives an external N-channel MOSFET
to provide adjustable voltage. The APW7045 moni-
tors two output voltages, and a single Power Good
signal is issued when the PWM voltage is within ±10%
of the DAC setting and the lineat regulator output level
is above under-voltage threshold. Additional built-in
over-voltage protection for the PWM output uses the
lower MOSFET to prevent output voltages above 115%
of the DAC setting. The PWM over-current function
monitors the output current by using the voltage drop
across the upper MOSFET’s R , eliminating the
DS(ON)
need for a current sensing resistor.
Pin Description
Applications
• Motherboard Power Regulation for Computers
• Low-Voltage Distributed Power Supplies
• VGA Card Power Regulation
• DDR SDRAM Power Regulation
VCC
1
DRIVE
2
PGOOD
3
SD
4
FB2
5
SS
6
FAULT
7
GND
8
16
UGATE
15
PHASE
14
LGATE
13
PGND
12
OCSET
11
VSEN1
10
FB1
9
COMP
ANPEC reserves the right to make changes to improve reliability or manufacturability without notice, and advise
customers to obtain the latest version of relevant information to verify before placing orders.
Copyright  ANPEC Electronics Corp.
1
Rev.A.5 - Jan., 2003
www.anpec.com.tw