LP2953_15 datasheet(31/41 Pages) TI

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Ground

VOUT

VIN

Input

Capacitor

Output

Capacitor

GND

OUT

SENSE

VTAP

GROUND

FEEDBACK

Error Pullup

Resistor

Vout

SHUTDOWN

ERROR

GROUND

REFERENCE

LP2952-N, LP2952A, LP2953, LP2953A

www.ti.com

SNVS095F – MAY 2004 – REVISED MARCH 2015

10 Layout

10.1 Layout Guidelines

For best overall performance, place all circuit components on the same side of the circuit board and as near as

practical to the respective LDO pin connections. Place ground return connections to the input and output

capacitors, and to the LDO ground pin as close to each other as possible, connected by a wide, component-side,

copper surface. The use of vias and long traces to create LDO circuit connections is strongly discouraged and

negatively affects system performance. This grounding and layout scheme minimizes inductive parasitics, and

thereby reduces load-current transients, minimizes noise, and increases circuit stability.

A ground reference plane is also recommended and is either embedded in the PCB itself or located on the

bottom side of the PCB opposite the components. This reference plane serves to assure accuracy of the output

voltage, shield noise, and behaves similar to a thermal plane to spread (or sink) heat from the LDO device. In

most applications, this ground plane is necessary to meet thermal requirements.

10.2 Layout Example

Figure 46. Layout Schematic

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LP2953 Datasheet(PDF) 31 Page - Texas Instruments