AUR9705AGH Diodes Incorporated

NOT RECOMMENDED FOR NEW DESIGN AUR9705 CONTACT US 1.5MHZ 1A STEP-DOWN DC-DC CONVERTER Description Pin Assignments (Top View) The AUR9705 is a high efficiency step-down DC-DC voltage converter. The chip operation is optimized using constant frequency, Pin 1 Mark peak-current mode architecture with built-in synchronous power MOSFET switchers and internal compensators to reduce external 1 6 NC FB part counts. It is automatically switching between the normal PWM mode and LDO mode to offer improved system power efficiency Exposed 2 EN 5 covering a wide range of loading conditions. GND Pad 3 4 VIN LX 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 WDFN-22-6 implementations. Additional features included Soft Start (SS), Under Voltage Lock Out (UVLO) and Thermal Shutdown Detection (TSD) to (Top View) provide reliable product applications. The device is available in adjustable output voltage versions ranging 1 5 LX from 1V to 3.3V, and is able to deliver up to 1A. VIN The AUR9705 is available in WDFN-22-6 and TSOT-23-5 packages. 2 GND Features EN 3 4 FB High Efficiency Buck Power Converter Low Quiescent Current Output Current: 1A TSOT-23-5 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 Applications Automatic PWM/LDO Mode Switching Control Thermal Shutdown Protection Mobile Phone, Digital Camera and MP3 Player Low Drop-Out Operation at 100% Duty Cycle Headset, Radio and Other Hand-held Instrument No Schottky Diode Required Post DC-DC Voltage Regulation PDA and Notebook Computer 1 of 14 AUR9705 February 2020 Diodes Incorporated www.diodes.com Document number: DS41991 Rev. 3 - 3 AUR9705 Typical Applications Circuit I R2 R2 1 6 FB NC 2 5 GND EN C1 R1 V = 2.5V to 5.5V IN V OUT 3 4 LX VIN L 2.2H C C IN OUT 4.7F 10F For WDFN-22-6 L 2.2H V = 2.5V to 5.5V IN 1 5 VIN LX V OUT C C IN OUT 2 4.7F 10F GND C1 R1 3 4 EN FB I R2 R2 For TSOT-23-5 R 1 Note 1: V V (1 ) . OUT FB R 2 -6 -6 When R2=300k to 60k, the I =2A to 10A, and R1C1 should be in the range between 310 and 610 for component selection. R2 V (V) R1 (k) R2 (k) C1 (pF) L1 (H) OUT 3.3 453 100 13 2.2 2.5 320 100 18 2.2 1.8 200 100 30 2.2 1.2 100 100 56 2.2 1.0 68 100 82 2.2 Table 1. Component Guide 2 of 14 AUR9705 February 2020 Diodes Incorporated www.diodes.com Document number: DS41991 Rev. 3 - 3 AUR9705 AUR9705