AQT104 Quik LDO 2.5V or Adjustable, No Output Cap, Low Dropout Regulator Preliminary Design Specification General Description The Quik LDO™ AQT104 is a low dropout regulator that requires no external output capacitor for stability and it is stable with any capacitive load. It offers 0.5 Ohms pass device with 500mA load current. Its output voltage is preset to values between 2V and 3.3V with 1% accuracy and presents very good line and load regulation. It also includes output current limit with foldback characteristic and thermal shutdown. The removal of the output capacitor allows cost and board space reduction along with energy saving at power on and off. It is best suited for battery-powered equipments and in particular for cellular phones. Block Diagram Revision 0.5, May 2, 2003 Applications • • • Cordless and cellular phones Medical equipment PDAs and battery-powered equipments Features • • • • • • • • • • • No need for output capacitor 500mA output current 150mV drop at 300mA Preset output voltages (1% accuracy) Low current consumption Foldback output current limitation Thermal Shutdown Excellent load and line regulation Low noise Fast turn on and off SOT23 package Pin Configuration Quik LDO™ technology is patent pending. Quik LDO™ is a trademark of Acutechnology Semiconductor Inc. Quik LDO™ is not a typo – with a Quik LDO™ you eliminate a “C”. Acutechnology Semiconductor Inc. www.acutechnology.com Acutechnology Semiconductor Inc. AQT104 Quik LDO™ Pin Description Pin Pin Name Function 1 2 3 4 5 VIN GND ENABLE ADJ/CBY VOUT Regulator Input. Ground Enable Output voltage adjust Regulator output Absolute Maximum Ratings VIN Voltage ................................................ 7V VIN Current............................................... 1A Operating Junction Temperature ............... 150ºC Lead Temperature (soldering 10 seconds). 260ºC Storage Temperature Range ...................... -65ºC to +150ºC Electrical Specifications Electrical characteristics are guaranteed by design over the full temperature range –40ºC <Tj<135ºC. Ambient temperature must be de-rated based upon power dissipation and package thermal characteristics. Unless otherwise stated, test conditions are Vin=Vout+0.5V, Iout=1mA, Tj=+25ºC. Symbol Parameter VIN Input Voltage Icc Ground Current ILIM Current Limit Vout Output Voltage Accuracy Conditions Min Typ Max Units 6 V 0.1 0.2 mA 700 850 mA 2 550 Ta=25ºC 1.5 1 DVcc DViload Tshut DO Line regulation VIN=(Vout+0.1V) to 6V Iout=20mA Load Regulation Iout=1 mA to 500mA % 2.5 Over Temperature Thermal Shut-down Temperature Thermal Shut down Hysteresis 1.5 3 mV 5 10 mV 160 20 ºC Dropout Voltage Iout=300mA 150 Reference Power Supply Rejection Freq.=120Hz 60 dB En Output Voltage Noise f=10Hz to 100KHz (no caps) Vout=2.5V 150 uVrms Venl EN Input Low Voltage Venh EN Input High Voltage Vin=5V Shutdown Current EN=0V PSRR Isd Acutechnology Semiconductor Inc. Preliminary Design Specification 180 0.8 AQT104 Rev 05, May 2, 2003 2 mV V V 10 300 nA www.acutechnology.com Page 2 of 4 Acutechnology Semiconductor Inc. AQT104 Quik LDO™ Typical Response 2.62 OUT / V 2.58 2.54 2.5 2.46 Output current / mA 2.42 450 350 250 150 50 0 100 200 300 400 Time/µSecs 500 600 100µSecs/div Enable signal / V Load transient (current step=500mA). No output capacitor!! 4.5 3.5 2.5 1.5 0.5 2.5 OUT / V 2 1.5 1 0.5 00 100 200 300 400 Time/µSec s 500 600 100µSec s /div Turn on and off transient response. Acutechnology Semiconductor Inc. Preliminary Design Specification AQT104 Rev 05, May 2, 2003 www.acutechnology.com Page 3 of 4 Acutechnology Semiconductor Inc. AQT104 Quik LDO™ Package Mechanical Details SOT23-5 DIM Millimetres Inches MIN MAX MIN MAX A 0.90 1.45 0.035 0.057 A1 0.00 0.15 0.00 0.006 A2 0.90 1.3 0.035 0.051 b 0.35 0.50 0.014 0.020 C 0.09 0.20 0.0035 0.008 D 2.80 3.00 0.110 0.118 E 2.60 3.00 0.102 0.118 E1 1.50 1.75 0.059 0.069 e 0.95 REF e1 1.90 REF 0.037 REF 0.075 REF L 0.10 0.60 0.004 0.024 a° 0 10 0 10 Contact information Acutechnology Semiconductor Inc. 3487 McKee Rd. Suite 52 San Jose CA 95127 USA TEL:(408) 259-2300 (408) 259-3400 FAX:(408) 259-9160 e-mail:[email protected] Acutechnology Semiconductor Inc. Preliminary Design Specification AQT104 Rev 05, May 2, 2003 www.acutechnology.com Page 4 of 4