APW7083 Datasheet, PDF (1/22 Pages) Anpec Electronics Coropration – 5A, 26V, 380kHz, Synchronous Step-Down Converter

APW7083
5A, 26V, 380kHz, Synchronous Step-Down Converter
Features
General Description
• Wide Input Voltage from 4.5V to 26V
• Output Current Up to 5A
•
Adjustable Output Voltage from 0.8V to 90%V
IN
- 0.8V Reference Voltage
- ±2.5% System Accuracy
• Integrated 50mΩ P-Channel Power MOSFET and
20mΩ N-Channel Power MOSFET
• High Efficiency up to 95%
• Current-Mode Operation
- Stable with Ceramic Output Capacitors
- Fast Transient Response
• Power-On-Reset Monitoring
• Fixed 380kHz Switching Frequency in PWM Mode
• Automatic Pulse-Skipping Mode (PSM)/PWM
Mode Operation
• Built-in Digital Soft-Start
• Output Current-Limit Protection with Frequency
Foldback
• 70% Under-Voltage Protection
• Over-Temperature Protection
• 118% Over-Voltage Protection
• <5µA Quiescent Current During Shutdown
• Thermal-Enhanced TQFN5x6-28 Package
• Pb-Free Available as an Option
• Lead Free and Green Devices Available
(RoHS Compliant)
Applications
• LCD Monitor / TV
• SetTop Box
• Portable DVD
• Wireless LAN
• ADSL, Switch HUB
• Notebook Computer
• Step-Down Converters Requiring High Efficiency
and 5A Output Current
The APW7083 is a 5A, synchronous, step-down converter
with integrated 50mΩ P-channel power MOSFET and
20mΩ N-channel power MOSFET. The device, with cur-
rent-mode control scheme, can convert 4.5~26V input volt-
age to the output voltage adjustable from 0.8 to 90% V_IN to
provide excellent output voltage regulation.
The APW7083 regulates the output voltage in an auto-
matic PSM/PWM mode operation, depending on the out-
put current, for high efficiency operation over light to full
load current. The APW7083 is also equipped with power-
on-reset, soft-start, and whole protections (including over-
voltage, under-voltage, over-temperature, and current-
limit) in a single package. In shutdown mode, the supply
current drops below 5µA.
This device, available in 28-pin TQFN5x6 package, pro-
vides a very compact system solution with minimal exter-
nal components and good thermal conductance.
Simplified Application Circuit
C1
10µF
V_IN
4.5V~26V
C3
1µF
R5
100kΩ
V_IN
VIN
VCC UGND
LX
U1 _ZCS
APW7083
EN ^PGND
COMP FB
R4 GND
R2
C6
1%
C5
C2
1µF _L1
5A
R1
1%
C7
(Optional)
V_OUT
0.8V~90%V_IN, 5A
C4
22µF
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.5 - Sep., 2011
www.anpec.com.tw