RPG

COUT

CIN

IN

OUT

EN

PG

GND

VOUT

VIN

LP3988-Q1

OFF

ON

VOUT OK

ERROR

VEN

VPG

Copyright © 2016, Texas Instruments Incorporated

1 µF

1 µF

12

LP3988-Q1

SLAS928B – MARCH 2013 – REVISED NOVEMBER 2016

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Product Folder Links: LP3988-Q1

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9 Application and Implementation

NOTE

Information in the following applications sections is not part of the TI component

specification, and TI does not warrant its accuracy or completeness. TI’s customers are

responsible for determining suitability of components for their purposes. Customers should

validate and test their design implementation to confirm system functionality.

9.1 Application Information

The LP3988-Q1 voltage regulator offers the benefit of ultra-low-dropout voltage, low noise, very low standby

current, and miniaturized surface-mount packaging. The LP3988-Q1 is designed for continuous, or sporadic

(power back-up), battery-operated applications where very low standby current is critical to extending system

battery life.

9.2 Typical Application

Figure 16. LP3988-Q1 Typical Application

9.2.1 Design Requirements

For typical CMOS voltage regulator applications, use the parameters listed in Table 1.

Table 1. Design Parameters

DESIGN PARAMETER

EXAMPLE VALUE

Minimum input voltage

3.05 V

Output voltage

2.85 V

Output current

150 mA

9.2.2 Detailed Design Procedure

9.2.2.1 External Capacitors

Like any low-dropout regulator, the LP3988-Q1 requires external capacitors for regulator stability. The LP3988-

Q1 is specifically designed for portable applications requiring minimum board space and smallest components.

These capacitors must be correctly selected for good performance.