APW7080
4A, 26V, 380kHz, Asynchronous Step-Down Converter

Features
· Wide Input Voltage from 4.5V to 26V
· Output Current up to 4A
· Adjustable Output Voltage from 0.8V to 90%V_IN
- 0.8V Reference Voltage
- ±2.5% System Accuracy
· 80mW Integrated P-Channel Power MOSFET
· High Efficiency up to 91%
-Pulse-Skipping Mode (PSM)/PWM ModeOperation
· Current-Mode Operation
- Stable with Ceramic Output Capacitors
- Fast Transient Response
· Power-On-Reset Monitoring
· Fixed 380kHz Switching Frequency in PWM Mode
· Built-in Digital Soft-Start
· Output Current-Limit Protection with Frequency Foldback
· 70% Undervoltage Protection
· Over-Temperature Protection
· <5mA Quiescent Current during Shutdown
· Thermal-Enhanced SOP-8P Package
· Lead Free and Green Devices Available (RoHS Compliant)

General Description
The APW7080 is a 4A, asynchronous, step-down converter with integrated 80mW P-channel MOSFET. The device, 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.
The APW7080 regulates the output voltage in automatic PSM/PWM mode operation, depending on the output current, for high efficiency operation over light to full load current.The APW7080 is also equipped with power-onreset, soft-start, and whole protections (undervoltage, over temperature, and current-limit) into a single package. In shutdown mode, the supply current drops below 5mA.
This device, available in an 8-pin SOP-8P package, provides a very compact system solution with minimal external components and good thermal conductance.


Simplified Application Circuit


Applications
· LCD Monitor / TV
· Set-Top Box
· Portable DVD
· Wireless LAN
· ADSL, Switch HUB
· Notebook Computer
· Step-down Converters Requiring High Efficiency and 4A Output Current

Absolute Maximum Ratings (Note 1)

Note 1: Stresses above those listed in “Absolute Maximum Ratings” may cause permanent damage to the device.

Block Diagram



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