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AUR9705 Dataheets PDF



Part Number AUR9705
Manufacturers BCD
Logo BCD
Description STEP DOWN DC-DC CONVERTER
Datasheet AUR9705 DatasheetAUR9705 Datasheet (PDF)

Data Sheet 1.5MHz, 1A, STEP DOWN DC-DC CONVERTER AUR9705 General Description The AUR9705 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.

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Data Sheet 1.5MHz, 1A, STEP DOWN DC-DC CONVERTER AUR9705 General Description The AUR9705 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 1A. The AUR9705 is available in WDFN-2×2-6 and TSOT-23-5 packages. 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 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 WDFN-2×2-6 TSOT-23-5 Nov. 2011 Rev. 1. 0 Figure 1. Package Types of AUR9705 BCD Semiconductor Manufacturing Limited 1 Data Sheet 1.5MHz, 1A, STEP DOWN DC-DC CONVERTER AUR9705 Pin Configuration D Package (WDFN-2×2-6) H Package (TSOT-23-5) Pin 1 Mark NC 1 EN 2 VIN 3 Exposed Pad 6 FB 5 GND 4 LX 15 2 34 Figure 2. Pin Configuration of AUR9705 (Top View) Pin Description Pin Number WDFN-2×2-6 TSOT-23-5 1 23 31 45 52 64 Pin Name NC EN VIN LX GND FB Function No internal connection (Floating or connected to GND) Enable signal input, active high Power supply input Connect to inductor This pin is the GND reference for the NMOS power stage. It must be connected to the system ground Feedback voltage from the output of the power supply Nov. 2011 Rev. 1. 0 BCD Semiconductor Manufacturing Limited 2 1.5MHz, 1A, STEP DOWN DC-DC CONVERTER Functional Block Diagram Data Sheet AUR9705 Figure 3. Functional Block Diagram of AUR9705 Ordering Information AUR9705 Circuit Type A: Adjustable Output Package D: WDFN-2×2-6 H: TSOT-23-5 G: Green Package WDFN-2×2-6 TSOT-23-5 Temperature Range -40 to 80°C Part Number AUR9705AGD AUR9705AGH Marking ID 705A 9705AG Packing Type Tape & Reel Tape & Reel BCD Semiconductor's Pb-free products, as designated with "G" in the part number, are RoHS compliant and green. Nov. 2011 Rev. 1. 0 BCD Semiconductor Manufacturing Limited 3 1.5MHz, 1A, STEP DOWN DC-DC CONVERTER Absolute Maximum Ratings (Note 1) Data Sheet AUR9705 Parameter Supply Input Voltage Enable Input Voltage Switch Output Voltage Power Dissipation (On PCB, TA=25°C) Thermal Resistance (Junction to Ambient, Simulation) Thermal Resistance (Junction to Case, Simulation) Operating Junction Temperature Operating Temperature Storage Temperature ESD (Human Body Model) ESD (Machine Model) Symbol VIN VEN VLX PD θJA θJC TJ TOP TSTG VHBM VMM Value 0 to 6.0 -0.3 to VIN+0.3 -0.3 to VIN+0.3 1.89 53 0.85 160 -40 to 85 -55 to 150 2000 200 Unit V V V W °C/W °C/W °C °C °C V V Note 1: Stresses greater than those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated under “Recommended Operating Conditions” is not implied. Exposure to “Absolute Maximum Ratings” for extended periods may affect device reliability. Recommended Operating Conditions Parameter Supply Input Voltage Junction Temperature Range Ambient Temperature Range Symbol VIN TJ TA Min 2.5 -20 -40 Max 5.5 125 80 Unit V °C °C Nov. 2011 Rev. 1. 0 BCD Semiconductor Manufacturing Limited 4 Data Sheet 1.5MHz, 1A, STEP DOWN DC-DC CONVERTER AUR9705 Electrical Characteristics VIN=VEN=5V, VFB=0.6V, L=2.2µH, CIN= 4.7µF, COUT=10µF, TA=25°C, unless otherwise specified. Parameter Input Voltage Range Shutdown Current Regulated1Feedback Voltage Regulated Output Voltage Accuracy Peak Current Inductor Oscillator Frequency PMOSFET RON NMOSFET RON Quiescent Current Symbol VIN IOFF VFB ∆VOUT/VOUT IPK fOSC RON(P) RON(N) IQ Conditions VEN=0V For Adjustable Output Voltage VIN=2.5V to 5.5V, IOUT=0 to 1A VFB=0.5V IOUT =200mA IOUT =200mA IOUT=0A, VFB=0.7V LX Leakage Current ILX VEN=0V, VLX=0V or 5V Feedback Current EN Leakage Current EN High-level Input V.


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