APW7062B_08 Datasheet, PDF (1/18 Pages) Anpec Electronics Coropration – Synchronous Buck PWM Controller

APW7062B
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 and Green Devices 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 APW7062B is a voltage mode and synchronous PWM
controller which drives dual N-Channel MOSFETs. It inte-
grates the control, monitoring, and protection functions
into a single package, provides one controlled power
outputs with under-voltage and over-current protection.
APW7062B provides 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,
and 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 , eliminating the need for a current sens-
DS(ON)
ing resistor. The under-voltage protection (UVP) moni-
tors the voltage of the 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 pro-
tection will shutdown the IC directly.
Pin Configuration
RT 1
OCSET 2
SS 3
COMP 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.4 - Oct., 2008
www.anpec.com.tw