7 Detailed Description

7.1 Overview

The LP2985-N is a fixed-output, low-noise, high PSRR, low-dropout regulator that offers exceptional, cost-

effective performance for both portable and nonportable applications. The LP2985-N has an output tolerance

of 1% across line, load, and temperature variation (for the new chip) and is capable of delivering 150 mA of

continuous load current.

This device features integrated overcurrent protection, thermal shutdown, output enable, and internal output

pulldown and has a built-in soft-start mechanism for controlled inrush current. This device delivers excellent

line and load transient performance. The operating ambient temperature range of the device is from –40°C to

+125°C.

7.2 Functional Block Diagrams

Figure 7-1. Block Diagram for Legacy Chip

Bandgap

Reference

VREF = 1.2 V

VIN

VOUT

GND

Internal

Controller

UVLO

Current

Limit

Thermal

Shutdown

ON/OFF

GND

Output

Pull-down

GND

BYPASS

GND

Figure 7-2. Block Diagram for New Chip

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LP2985-N

SNVS018Z – MARCH 2000 – REVISED MAY 2023

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Product Folder Links: LP2985-N