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LP38842SX-0.8 Datasheet(PDF) 1 Page - National Semiconductor (TI) |
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LP38842SX-0.8 Datasheet(HTML) 1 Page - National Semiconductor (TI) |
1 / 11 page LP38842 1.5A Ultra Low Dropout Linear Regulators Stable with Ceramic Output Capacitors General Description The LP38842 is a high current, fast response regulator which can maintain output voltage regulation with minimum input to output voltage drop. Fabricated on a CMOS process, the device operates from two input voltages: Vbias provides voltage to drive the gate of the N-MOS power transistor, while Vin is the input voltage which supplies power to the load. The use of an external bias rail allows the part to operate from ultra low Vin voltages. Unlike bipolar regula- tors, the CMOS architecture consumes extremely low quies- cent current at any output load current. The use of an N-MOS power transistor results in wide bandwidth, yet mini- mum external capacitance is required to maintain loop sta- bility. The fast transient response of these devices makes them suitable for use in powering DSP, Microcontroller Core volt- ages and Switch Mode Power Supply post regulators. The parts are available in TO-220 and TO-263 packages. Dropout Voltage: 115 mV (typ) @ 1.5A load current. Quiescent Current: 30 mA (typ) at full load. Shutdown Current: 30 nA (typ) when S/D pin is low. Precision Output Voltage: 1.5% room temperature accu- racy. Features n Ideal for conversion from 1.8V or 1.5V inputs n Designed for use with low ESR ceramic capacitors n 0.8V, 1.2V and 1.5V standard voltages available n Ultra low dropout voltage (115mV @ 1.5A typ) n 1.5% initial output accuracy n Load regulation of 0.1%/A (typical) n 30nA quiescent current in shutdown (typical) n Low ground pin current at all loads n Over temperature/over current protection n Available in 5 lead TO220 and TO263 packages n −40˚C to +125˚C junction temperature range Applications n ASIC Power Supplies In: - Desktops, Notebooks, and Graphics Cards, Servers - Gaming Set Top Boxes, Printers and Copiers n Server Core and I/O Supplies n DSP and FPGA Power Supplies n SMPS Post-Regulator Typical Application Circuit 20103001 * Minimum value required if Tantalum capacitor is used (see Application Hints). December 2004 © 2004 National Semiconductor Corporation DS201030 www.national.com |
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