LP38851| Datasheet

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LP38851 800 mA Fast-Response High-Accuracy LDO Linear Regulator with Enable and Soft-Start

June 2007

LP38851 800 mA Fast-Response High-Accuracy Adjustable LDO Linear Regulator with Enable and Soft-Start
General Description
The LP38851-ADJ is a high current, fast response regulator which can maintain output voltage regulation with extremely low 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 regulators, the CMOS architecture consumes extremely low quiescent current at any output load current. The use of an N-MOS power transistor results in wide bandwidth, yet minimum external capacitance is required to maintain loop stability. The fast transient response of this device makes it suitable for use in powering DSP, Microcontroller Core voltages and Switch Mode Power Supply post regulators. The part is available in PSOP 8 pin, TO-220 7 pin, and TO-263 7-pin packages. Dropout Voltage: 115 mV (typical) at 800 mA load current. Low Ground Pin C
urrent: 10 mA (typical) at 800 mA load current. Soft-Start: Programmable Soft-Start time. Precision ADJ Voltage: 1.5% for TJ = 25 C, and 2.0% for 0 C TJ +125 C, across all line and load conditions

Features

Adjustable VOUT range of 0.80V to 1.8V Wide VBIAS Supply operating range of 3.0V to 5.5V Stable with 10uF Ceramic capacitors Dropout voltage of 115 mV (typical) at 800 mA load current Precision VADJ across all line and load conditions: -- 1.5% VADJ for TJ = 25 C -- 2.0% VADJ for 0 C TJ +125 C -- 3.0% VADJ for -40 C TJ +125 C Over-Temperature and Over-Current protection Available in 8 lead PSOP, 7 lead TO-220 and 7 lead TO-263 packages -40 C to +125 C Operating Junction Temperature Range

Applications
ASIC Power Supplies in:
- Desktops, Notebooks, and Graphics Cards, Servers - Gaming Set Top Boxes, Printers and Copiers Server Core and I/O Supplies DSP and FPGA Power Supplies SMPS Post-Regulator

Typical Application Circuit

30002501

2007 National Semiconductor Corporation

300025

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