APW7064 Datasheet, PDF (1/19 Pages) Anpec Electronics Coropration – Synchronous Buck PWM Controller

APW7064
Synchronous Buck PWM Controller
Features
General Description
• Single 12V Power Supply Required
• Fast Transient Response
- 0~90% Duty Ratio
• 1.2V Reference with 1% Accuracy
• Shutdown Function by Controlling COMP Pin
Voltage
• Internal Soft-Start (5.1ms) Function
• Voltage Mode PWM Control Design
• Under-Voltage Protection
• 200kHz Fixed Switching Frequency
• SOP-8P Package
• Lead Free and Green Devices Available
(RoHS Compliant)
Applications
• Graphics Card
• Mother Board
• SMPS
The APW7064 uses fixed 200kHz switching frequency,
voltage mode, synchronous PWM controller which drives
dual N-channel MOSFETs. The device integrates the
control, monitoring and protection functions into a single
package, provides one controlled power output with
under-voltage protection.
The APW7064 provides excellent regulation for output
load variation. The internal 1.2V temperature-compensated
reference voltage is designed to meet the requirement
of low output voltage applications. An built-in digital soft-
start with fixed soft-start interval prevents the output voltage
from overshoot as well as limiting the input current.
The APW7064 with excellent protection functions: POR
and UVP. The Power-On-Reset (POR) circuit can monitor
V_CC supply voltage exceeds its threshold voltage while
the controller is running, and a built-in digital soft-start
provides output with controlled voltage rise. The Under-
Voltage Protection (UVP) monitors the voltage of FB pin
for short-circuit protection. When the V is less than
FB
50% of V_REF (0.6V), the controller will shutdown the IC
directly.
Pin Configuration
Typical Application Circuit
12V
V_IN
BOOT 1
UGATE 2
GND 3
LGATE 4
8 PHASE
7 COMP
6 FB
5 VCC
APW7064
L
V_OUT
SOP-8P
APW7064
= Thermal Pad
(connected to GND plane for better heat dissipation)
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 - Aug., 2009
www.anpec.com.tw