APW7061 Datasheet, PDF (1/17 Pages) Anpec Electronics Coropration – Synchronous Buck PWM Controller

APW7061
Features
• Fast Transient Response
- 0~85% Duty Ratio
• Excellent Output Voltage Regulation
- 0.8V Internal Reference
- ±1% Over Line Voltage and Temperature
• Internal Soft-Start
- Typical 2mS
• Over Current Protection
- Sense Low-side MOSFET’s R_DS(ON)
• Under Voltage Lockout
• Small Converter Size
- 250kHz Free-running Oscillator
• 8-lead SOIC Package
• Lead Free Available (RoHS Compliant)
Applications
• Graphic Cards
• Memory Power Supplies
• DSL or Cable MODEMs
• Set Top Boxes
• Low-Voltage Distributed Power Supplies
Synchronous Buck PWM Controller
General Description
The APW7061 is a voltage mode, synchronous PWM
cont roller which drives dual N-c hannel MOSFETs . It
integrates t he c ont rols, monitoring and protec tion
funct ions into a single package, which provides one
c ontrolled power output s wit h under-voltage and
over-current protections.
APW7061 provides excellent regulation for output load
variation. An internal 0.8V temperature-compensated
reference voltage is designed to meet the various low
output voltage applications.
A power-on-reset (POR) circuit limits the VCC minimum
opearting s upply voltage to ass ure the c ontroller
working well. Over current protec tion is achieved by
monit oring t he volt age drop ac ros s the low s ide
MOSFET, eliminating the need for a current sensing
resistor and short circuit condition is detected through
the FB pin. The over-current protection triggers the
soft -start function until the fault events be removed,
but Under-voltage protection will shutdown IC directly.
Pull the COMP pin below 0.4V will shutdown t he
controller, and both gate drive signals will be low.
Pinouts
VCC 1
FB 2
COMP 3
GND 4
8 LGATE
7 BOOT
6 UGATE
5 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.
C opyright © ANPEC Electronics C orp.
1
Rev. A.7 - Nov., 2005
www.anpec.com.tw