Diodes AUR9710 User Manual download pdf

Data Sheet

1.5MHz, 1A, Step-down DC-DC Converter AUR9710

Nov. 2011 Rev. 1. 0 BCD Semiconductor Manufacturing Limited

General Description

The AUR9710 is a high efficiency step-down

DC-DC voltage converter. The chip operation is

optimized using constant frequency, peak-current

mode architecture with built-in synchronous power

MOSFET switchers and internal compensators to

reduce external part counts. It is automatically

switching between the normal PWM mode and LDO

mode to offer improved system power efficiency

covering a wide range of loading conditions.

The oscillator and timing capacitors are all built-in

providing an internal switching frequency of 1.5MHz

that allows the use of small surface mount inductors

and capacitors for portable product implementations.

Additional features including Soft Start (SS), Under

Voltage Lock Out (UVLO) and Thermal Shutdown

Detection (TSD) are integrated to provide reliable

product applications.

The device is available in adjustable output voltage

versions ranging from 1V to 3.3V, and is able to

deliver up to 1A.

The AUR9710 is available in WDFN-3×3-10

package.

Features

• High Efficiency Buck Power Converter

• Low Quiescent Current

• Output Current: 1A

• Adjustable Output Voltage from 1V to 3.3V

• Wide Operating Voltage Range: 2.5V to 5.5V

•

Built-in Power Switchers for Synchronous

Rectification with High Efficiency

• Feedback Voltage: 800mV

• 1.5MHz Constant Frequency Operation

• Automatic PWM/LDO Mode Switching Control

• Thermal Shutdown Protection

• Low Drop-out Operation at 100% Duty Cycle

• No Schottky Diode Required

Applications

• Battery Powered Devices

• Mobile Phone, Digital Camera and MP3 Player

• Headset, Radio and Other Hand-held Instruments

• PCI Card, WiFi card

• PDA and Notebook Computer

Figure 1. Package Type of AUR9710

WDFN-3×3-10

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