APW7080 Datasheet, PDF (1/23 Pages) Anpec Electronics Coropration – 4A, 26V, 380kHz, Asynchronous Step-Down Converter

APW7080
4A, 26V, 380kHz, Asynchronous Step-Down Converter
Features
General Description
• Wide Input Voltage from 4.5V to 26V
The APW7080 is a 4A, asynchronous, step-down converter
• Output Current up to 4A
with integrated 80mΩ P-channel MOSFET. The device,
•
Adjustable Output Voltage from 0.8V to 90%V
IN
- 0.8V Reference Voltage
- ±2.5% System Accuracy
with current-mode control scheme, can convert 4.5~26V
input voltage to the output voltage adjustable from 0.8 to
90% V_IN to provide excellent output voltage regulation.
• 80mΩ Integrated P-Channel Power MOSFET
The APW7080 regulates the output voltage in automatic
• High Efficiency up to 91%
PSM/PWM mode operation, depending on the output
current, for high efficiency operation over light to full load
- Pulse-Skipping Mode (PSM) / PWM Mode Operation _{current.The APW7080 is also equipped with power-on-}
• Current-Mode Operation
reset, soft-start, and whole protections (undervoltage, over
- Stable with Ceramic Output Capacitors
temperature, and current-limit) into a single package. In
- Fast Transient Response
shutdown mode, the supply current drops below 5µA.
• Power-On-Reset Monitoring
This device, available in an 8-pin SOP-8P package,
• Fixed 380kHz Switching Frequency in PWM Mode _{provides a very compact system solution with minimal}
• Built-in Digital Soft-Start
external components and good thermal conductance.
• Output Current-Limit Protection with Frequency
Foldback
• 70% Undervoltage Protection
• Over-Temperature Protection
• <5µA Quiescent Current during Shutdown
• Thermal-Enhanced SOP-8P Package
• Lead Free and Green Devices Available
100
90
80
V_OUT =5V
70
V_OUT =3.3V
60
50
40
(RoHS Compliant)
30
Simplified Application Circuit
20
10
0.001 0.01
0.1
1
10
C1
10µF
V_IN
+12
Output Current, I (A)
OUT
Applications
VIN
C2
VCC UGND
L1
4A
C3
LX
• LCD Monitor / TV
V_OUT
•
Set-Top Box
U1
D1
+3.3V _{• Portable DVD}
APW7080
C4
V_IN
EN
R1
22µF
• Wireless LAN
1%
COMP FB
• ADSL, Switch HUB
R4
GND
R2
C6
1%
C5
C7
(Optional)
• Notebook Computer
• Step-down Converters Requiring High Efficiency
and 4A Output Current
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.6 - Jun., 2008
www.anpec.com.tw