LP3996

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SNVS360B – NOVEMBER 2006 – REVISED JANUARY 2008

Typical Performance Characteristics. (continued)

Noise Density LDO1

Noise Density, LDO2

Power-on-Reset Start-up Operation

Power-on-Reset Shutdown Operation

POR Delay Time

Application Hints

OPERATION DESCRIPTION

The LP3996 is a low quiescent current, power management IC, designed specifically for portable applications

requiring minimum board space and smallest components. The LP3996 contains two independently selectable

LDOs. The first is capable of sourcing 150mA at outputs between 0.8V and 3.3V. The second can source 300mA

at an output voltage of 0.8V to 3.3V. In addition, LDO2 contains power good flag circuit, which monitors the

output voltage and indicates when it is within 8% of its nominal value. The flag will also act as a power-on-reset

signal and, by adding an external capacitor; a delay may be programmed for the POR output.

INPUT CAPACITOR

An input capacitor is required for stability. It is recommended that a 1.0µF capacitor be connected between the

LP3996 input pin and ground (this capacitance value may be increased without limit).

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