LP5907 datasheet(11/50 Pages) TI2

11 / 50 page

6 Detailed Description

6.1 Overview

Designed to meet the needs of sensitive RF and analog circuits, the LP5907 provides low noise, high PSRR,

low quiescent current, and low line and load transient response figures. Using innovative design techniques, the

LP5907 offers class leading noise performance without the need for a separate noise filter capacitor.

The LP5907 is designed to perform with a single 1µF input capacitor and a single 1µF ceramic output capacitor.

With a reasonable PCB layout, the single 1µF ceramic output capacitor can be placed up to 10cm away from the

LP5907 device.

6.2 Functional Block Diagram

VBG

1.20V

GND

POR

OUT

1 M

RAD

6.3 Feature Description

6.3.1 Enable (EN)

The LP5907 EN pin is internally held low by a 1MΩ resistor to GND. The EN pin voltage must be higher than

the VIH threshold to make sure that the device is fully enabled under all operating conditions. The EN pin voltage

must be lower than the VIL threshold to make sure that the device is fully disabled and the automatic output

discharge is activated.

6.3.2 Low Output Noise

Any internal noise at the LP5907 reference voltage is reduced by a first-order, low-pass RC filter before being

passed to the output buffer stage. The low-pass RC filter has a –3-dB cut-off frequency of approximately 0.1Hz.

6.3.3 Output Automatic Discharge

The LP5907 output employs an internal 230Ω (typical) pulldown resistance to discharge the output when the EN

pin is low and the device is disabled.

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LP5907

SNVS798Q – APRIL 2012 – REVISED JULY 2025

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