Copyright  ANPEC Electronics Corp.
Rev. A.1 - Feb., 2006
APW7065
www.anpec.com.tw1
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.
Synchronous Buck PWM Controller
• Single 12V Power Supply Required
• Fast Transient Response
- 0~90% Duty Ratio
• 0.8V Reference with 1% Accuracy
• Shutdown Function by Controlling
COMP Pin Voltage
• Internal Soft-Start (3.4ms) Function
• Voltage Mode PWM Control Design
• Under-Voltage Protection
• Over-Current Protection
- Sense Low Side MOSFET’s RDS(ON)
• 300KHz Fixed Switching Frequency
• SOP-8 Package
• Lead Free Available (RoHS Compliant)
Features
Applications
General Description
The APW7065 uses fixed 300KHz 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 and over-current protections.
The APW7065 provides excellent regulation for output
load variation. The internal 0.8V 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 APW7065 with excellent protection functions:
POR, OCP and UVP. The Power-On Reset (POR)
circuit can monitor VCC 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 Over-Current Protection (OCP)
monitors the output current by using the voltage drop
across the lower MOSFET’s RDS(ON), comparing with
internal VOCP (0.27V), when the output current reaches
the trip point, the controller will run the soft-start
function until the fault events are removed. The Under-
Voltage Protection (UVP) monitors the voltage of FB
pin for short-circuit protection, when the VFB is less
than 50% of VREF (0.4V), the controller will shutdown
the IC directly.
Pinouts
SOP-8
• Graphics Card
• Mother Board
1
2
3
4
8
7
6
5
PHASE
COMP
FB
VCC
BOOT
UGATE
GND
LGATE