LP38859 datasheet(10/25 Pages) TI

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GND

OUT

BIAS

Undervoltage

Lockout

Thermal

Shutdown

VREF

0.6 V

ILIMIT

LP38859-x.x

rSS

LP38859

SNVS337F – JUNE 2006 – REVISED SEPTEMBER 2015

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7 Detailed Description

7.1 Overview

The LP38559 is a fast-response, high-current, low-dropout regulator, available in output voltages are 0.8 V and

1.2 V. This part is capable of delivering 3-A continuous load current. Standard regulator features, such as

overcurrent and over temperature protection, are also included. The LP38559 contains several features:

•

Low dropout voltage, typical 240 mV at 3-A load.

•

The bias voltage(VBIAS) provides voltage to drive the gate of the N-MOS power transistor.

•

The input voltage(VIN) is the input voltage which supplies power to the load.

•

Programmable soft-start time.

7.2 Functional Block Diagram

7.3 Feature Description

7.3.1 Input Voltage

The input voltage (VIN) is the high current external voltage rail that is regulated down to a lower voltage, which is

applied to the load. The input voltage must be at least VOUT + VDO, and no higher than whatever values is used

for VBIAS.

7.3.2 Bias Voltage

The bias voltage (VBIAS) is a low current external voltage rail required to bias the control circuitry and provide

gate drive for the N-FET pass transistor. The bias voltage must be in the range of 3 V to 5.5 V to ensure proper

operation of the device.

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LP38859 Datasheet(PDF) 10 Page - Texas Instruments