APW7062A Datasheet, PDF (1/16 Pages) Anpec Electronics Coropration – Synchronous Buck PWM Controller

APW7062A
Features
• Simple Single-Loop Control Design
- Voltage-Mode PWM Control
• Fast Transient Response
- Full 0–100% Duty Ratio
• Excellent Output Voltage Regulation
- 0.8V Internal Reference
- ± 1% Over Line Voltage and Temperature
• Over Current Fault Monitor
- Uses Upper MOSFETs R_{DS (ON)}
• Converter Can Source and Sink Current
• Small Converter Size
- 200kHz Free-Running Oscillator
- Programmable from 70kHz to 800kHz
• 14-Lead SOIC Package
• Lead Free Available (RoHS Compliant)
Applications
• Graphic Cards
• DDR Memory Power Supply
• DDR Memory Termination Voltage
• Low-Voltage Distributed Power Supplies
Synchronous Buck PWM Controller
General Description
The APW7062A is a voltage mode, synchronous PWM
controller which drives dual N-Channel MOSFETs. It
integrates the control, monitoring and protection func-
tions into a single package, provides one controlled
power outputs with under-voltage and over-current
protection.
APW7062A provide excellent regulation for output load
variation. An internal 0.8V temperature-compensated
reference voltage is designed to meet the requirement
of low output voltage applications. It includes a 200kHz
free-running triangle-wave oscillator that is adjustable
from 70kHz to 800kHz.
The power-on-reset (POR) circuit monitors the VCC,
EN, OCSET input voltage to start-up or shutdown the
IC. The over-current protection (OCP) 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. The under-voltage protection
(UVP) monitors the voltage of FB pin for short-circuit
protection.
The over-current protection trip cycle the soft-start func-
tion until the fault events be removed. Under-voltage
protection will shutdown the IC directly.
Pinouts
RT 1
OCSET 2
SS 3
NC 4
FB 5
EN 6
GND ⁷
14 VCC
13 PVCC
12 _LGATE
11 _PGND
10 BOOT
9 UGATE
8 PHASE
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.3 - Mar., 2005
www.anpec.com.tw