NOT RECOMMENDED FOR NEW DESIGN CONTACT US Data Sheet Dual High-efficiency PWM Step-down DC-DC Converter with OVP AUR9707 Features General Description Dual Channel High Efficiency Buck Power The AUR9707 is a high efficiency step-down DC- Converter DC voltage converter. The chip operation is Low Quiescent Current optimized using constant frequency, peak-current Output Current: 1A mode architecture with built-in synchronous power Adjustable Output Voltage from 1V to 3.3V MOSFET switchers and internal compensators to Wide Operating Voltage Range: 2.5V to 5.5V reduce external part counts. It is automatically switching between the normal PWM mode and LDO Built-in Power Switches for Synchronous mode to offer improved system power efficiency Rectification with High Efficiency covering a wide range of loading conditions. Feedback Voltage: 600mV 1.5MHz Constant Frequency Operation Automatic PWM/LDO Mode Switching Control The oscillator and timing capacitors are all built-in Thermal Shutdown Protection providing an internal switching frequency of 1.5MHz Low Drop-out Operation at 100% Duty Cycle that allows the use of small surface mount inductors No Schottky Diode Required and capacitors for portable product implementations. Internal Input Over Voltage Protection Additional features included Soft Start (SS), Under Voltage Lock Out (UVLO), Input Over Voltage Protection (IOVP) and Thermal Shutdown Detection Applications (TSD) are integrated to provide reliable product applications. Mobile Phone, Digital Camera and MP3 Player Headset, Radio and Other Hand-held Instrument The device is available in adjustable output voltage Post DC-DC Voltage Regulation versions ranging from 1V to 3.3V, and is able to PDA and Notebook Computer deliver up to 1A. The AUR9707 is available in WDFN-33-12 package. WDFN-33-12 Figure 1. Package Type of AUR9707 Feb. 2012 Rev. 1. 1 BCD Semiconductor Manufacturing Limited 1 Data Sheet Dual High-efficiency PWM Step-down DC-DC Converter with OVP AUR9707 Pin Configuration D Package (WDFN-33-12) Pin 1 Dot by Marking 1 12 2 11 3 10 Exposed 4 9 Pad 5 8 6 7 Figure 2. Pin Configuration of AUR9707 (Top View) Pin Description Pin Number Pin Name Function 1 VIN2 Power supply input of channel 2 2 LX2 Connection from power MOSFET of channel 2 to inductor This pin is the GND reference for the NMOSFET power stage. It 3, 9 GND must be connected to the system ground 4 FB1 Feedback voltage of channel 1 5, 11 NC1,NC2 No internal connection (floating or connecting to GND) 6 EN1 Enable signal input of channel 1, active high 7 VIN1 Power supply input of channel 1 8 LX1 Connection from power MOSFET of channel 1 to inductor 10 FB2 Feedback voltage of channel 2 12 EN2 Enable signal input of channel 2, active high Feb. 2012 Rev. 1. 1 BCD Semiconductor Manufacturing Limited 2