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LP38853

www.ti.com

SNVS335E – DECEMBER 2006 – REVISED NOVEMBER 2015

9 Power Supply Recommendations

The LP38853 device is designed to operate from an input voltage supply range from 3 V and 5.5 V. The input

voltage range provides adequate headroom in order for the device to have a regulated output. This input supply

must be well regulated. An input capacitor of at least 10

μF is required.

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

capacitor, and to the LDO ground pin as close as possible to each other, 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 parasitic, 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 similarly to a thermal plane to spread heat from the LDO device when

connected to the PowerPAD. In most applications, this ground plane is necessary to meet thermal requirements.

10.2 Layout Examples

Figure 31. LP38853 DDPAK/TO-263 and TO-220 Layout Example

Figure 32. LP38853 SO PowerPAD Layout Example

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