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AAT1140 Dataheets PDF



Part Number AAT1140
Manufacturers Advanced Analog Technology
Logo Advanced Analog Technology
Description Fast Transient 600mA Step-Down Converter
Datasheet AAT1140 DatasheetAAT1140 Datasheet (PDF)

PRODUCT DATASHEET AAT1140 SwitchRegTM General Description The AAT1140 SwitchReg is a 1.4MHz step-down converter with an input voltage range of 2.7V to 5.5V and output voltage as low as 0.6V. It is optimized to react quickly to a load variation. The AAT1140 is available in fixed voltage versions with internal feedback and a programmable version with external feedback resistors. It can deliver 600mA of load current while maintaining a low 35μA no load quiescent www.DataSheet4U.com current. The 1..

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PRODUCT DATASHEET AAT1140 SwitchRegTM General Description The AAT1140 SwitchReg is a 1.4MHz step-down converter with an input voltage range of 2.7V to 5.5V and output voltage as low as 0.6V. It is optimized to react quickly to a load variation. The AAT1140 is available in fixed voltage versions with internal feedback and a programmable version with external feedback resistors. It can deliver 600mA of load current while maintaining a low 35μA no load quiescent www.DataSheet4U.com current. The 1.4MHz switching frequency minimizes the size of external components while keeping switching losses low. The AAT1140 is designed to maintain high efficiency throughout the operating range, which is critical for portable applications. The AAT1140 is available in a Pb-free SOT23-5 package and is rated over the -40°C to +85°C temperature range. Fast Transient 600mA Step-Down Converter Features • • • • • • • • • • • • • • VIN Range: 2.7V to 5.5V VOUT Fixed or Adjustable from 0.6V to VIN 35μA No Load Quiescent Current Up to 98% Efficiency 600mA Max Output Current 1.4MHz Switching Frequency 120μs Soft Start Fast Load Transient Over-Temperature Protection Current Limit Protection 100% Duty Cycle Low-Dropout Operation <1μA Shutdown Current SOT23-5 Package Temperature Range: -40°C to +85°C Applications • • • • • • Cellular Phones Digital Cameras Handheld Instruments Microprocessor / DSP Core / IO Power PDAs and Handheld Computers USB Devices Typical Application (Fixed Output Voltage) U1 AAT1140 VIN C2 4.7µF IN EN GND LX OUT L1 4.7µH VOUT C1 4.7µF 1140.2007.12.1.1 www.analogictech.com 1 PRODUCT DATASHEET AAT1140 SwitchRegTM Pin Descriptions Pin # 1 2 3 4 5 www.DataSheet4U.com Fast Transient 600mA Step-Down Converter Symbol EN GND LX IN OUT Function Enable pin. Ground pin. Connect to the output and input capacitor return. Switching node. Connect the inductor to this pin. It is internally connected to the drains of both high- and low-side MOSFETs. Input supply voltage for the converter. Feedback input pin. This pin is connected either directly to the converter output or to an external resistive divider for an adjustable output. Pin Configuration SOT23-5 (Top View) EN GND LX 1 5 OUT 2 3 4 IN 2 www.analogictech.com 1140.2007.12.1.1 PRODUCT DATASHEET AAT1140 SwitchRegTM Absolute Maximum Ratings1 Symbol VIN VLX VOUT VEN TJ TS TLEAD www.DataSheet4U.com Fast Transient 600mA Step-Down Converter Description Input Voltage to GND LX to GND OUT to GND EN to GND Operating Junction Temperature Range Storage Temperature Range Maximum Soldering Temperature (at leads, 10 sec) Value 6.0 -0.3 to VIN + 0.3 -0.3 to VIN + 0.3 -0.3 to 6.0 -40 to 150 -65 to 150 300 Units V V V V °C °C °C Thermal Information Symbol PD θJA Description Maximum Power Dissipation2, 3 Thermal Resistance2 Value 667 150 Units mW °C/W 1. Stresses above those listed in Absolute Maximum Ratings may cause permanent damage to the device. Functional operation at conditions other than th.


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