Diodes AUR9703 Manuel d'utilisateur télécharger pdf

Data Sheet

1.5MHz, 800mA, STEP DOWN DC-DC CONVERTER AUR9703

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

General Description

The AUR9703 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 included Soft Start (SS), Under

Voltage Lock Out (UVLO), and Thermal Shutdown

Detection (TSD) 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 800mA.

The AUR9703 is available in TSOT-23-5 package.

Features

• High Efficiency Buck Power Converter

• Low Quiescent Current

• Output Current: 800mA

• Adjustable Output Voltage from 1V to 3.3V

• Wide Operating Voltage Range: 2.5V to 5.5V

•

Built-in Power Switches for Synchronous

Rectification with High Efficiency

• Feedback Voltage: 600mV

• 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

• Mobile Phone, Digital Camera and MP3 Player

• Headset, Radio and Other Hand-held Instrument

• Post DC-DC Voltage Regulation

• PDA and Notebook Computer

Figure 1. Package Type of AUR9703

TSOT-23-5

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