Diodes AUR9703 - Manual

Data Sheet
1.5MHz, 800mA, STEP DOWN DC-DC CONVERTER AUR9703
Nov. 2011 Rev. 1 .0 BCD Semiconductor Manufacturing Limited
1
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