APW7063 Datasheet, PDF (1/21 Pages) Anpec Electronics Coropration – Synchronous Buck PWM and Linear Controller

APW7063
Synchronous Buck PWM and Linear Controller
Features
General Description
• Provide Two Regulated Voltages
- Synchronous Rectified Buck PWM Controller
- Linear Controller
• Fast Transient Response
- 0~85% Duty Ratio
• Excellent Output Voltage Regulation
- 0.8V Internal Reference
- ±1% Over Line Voltage and Temperature
• Over Current Protection
- Sense Low-Side MOSFET’s R_DS(ON)
• Under Voltage Lockout
• Small Converter Size
- 250KHz Free-Running Oscillator
- Programmable From 70kHz to 800kHz
• 14-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
The APW7063 integrates PWM and linear controller,
as well as the monitoring and protection functions into
a single package. The synchronous PWM cont roller
which drives dualN-channel MOSFETs, which provides
one controlled power outputs with under-voltage and
over-current protect ions . Linear cont roller drives an
ext ernal N-c hannel MOS FE T with under-volt age
protection.
APW7063 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 PW 7063 inc ludes a
250kHz free-running t riangle-wave osc illator that is
adjust able from below 70KHz to over 800KHz.
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 t riggers 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
RT 1
SS 2
VREG 3
FB 4
COMP 5
GND 6
PHASE 7
14 FBL
13 DRIVE
12 _VCC
11 LGATE
10 PGND
9 BOOT
8 UGATE
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