LP5907 datasheet(11/36 Pages) TI1

11 / 36 page

VBG

1.20V

GND

POR

OUT

1 M

VIH

RAD

LP5907

www.ti.com

SNVS798J – APRIL 2012 – REVISED MARCH 2016

Product Folder Links: LP5907

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7 Detailed Description

7.1 Overview

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

quiescent current, as well as low line and load transient response figures. Using new 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 1-µF input capacitor and a single 1-µF ceramic output

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

away from the LP5907 device.

7.2 Functional Block Diagram

7.3 Feature Description

7.3.1 Enable (EN)

The LP5907 EN pin is internally held low by a 1-M

Ω resistor to GND. The EN pin voltage must be higher than the

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

be lower than the VIL threshold to ensure that the device is fully disabled and the automatic output discharge is

activated.

7.3.2 Low Output Noise

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

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

LP5907 데이터시트(PDF) 11 Page - Texas Instruments