OUT

IN

GND

LP38513

EN

10 k:

ERROR

10 PF

Ceramic

10 PF

Ceramic

GND

GND

ON

OFF

LP38513

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SNVS361E – JULY 2007 – REVISED NOVEMBER 2015

8 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.

8.1 Application Information

The typical application of the LP38513 includes microprocessor supplies, bus terminators, post regulators, and

battery-powered application. Figure 18 shows the typical application circuit for LP38513. The input and output

capacitances may need to be increased above the 10-µF minimum for some applications.

8.2 Typical Application

Figure 18. LP38513 Typical Application

8.2.1 Design Requirements

For the typical LP38513 ultra-low-dropout linear regulator applications, use the parameters listed in Table 1.

Table 1. Design Parameters

DESIGN PARAMETER

EXAMPLE VALUE

Minimum input voltage

2.25 V

Output voltage

1.8 V

Output current

0 mA to 3 A

8.2.2 Detailed Design Procedure

8.2.2.1 External Capacitors

Like any low-dropout regulator, external capacitors are required to assure stability. These capacitors must be

correctly selected for proper performance.

8.2.2.1.1

Input Capacitor

A ceramic input capacitor of at least 10 µF is required. For general usage across all load currents and operating

conditions, a 10-µF ceramic input capacitor provides satisfactory performance.

8.2.2.1.2

Output Capacitor

A ceramic capacitor with a minimum value of 10 µF is required at the output pin for loop stability. It must be

located less than 1 cm from the device and connected directly to the OUT and GND pin using traces which have

no other currents flowing through them. As long as the minimum of 10 µF ceramic is met, there is no limitation on

any additional capacitance.

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