LP2992_15 Datasheet, PDF (21/35 Pages) Texas Instruments – LP2992 Micropower 250-mA Low-Noise Ultralow-Dropout Regulator in SOT-23 and WSON Packages Designed for Use with Very Low-ESR Output Capacitors

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LP2992
SNVS171I – NOVEMBER 2001 – REVISED NOVEMBER 2015
9 Power Supply Recommendations
The LP2992 is designed to operate from an input voltage supply range from 2.2 V to 16 V. The input voltage
range provides the adequate headroom in order for the device to have a regulated output. This input supply must
be well regulated. If the input supply is noisy, additional input capacitors with low ESR can help to improve the
output noise performance.
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 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 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 Examples
V_IN
C_IN
V_ON/OFF
1 IN
OUT 5
V_OUT
C_OUT
2 GND
Power Ground
3
ON/
OFF
BYPASS
4
C_BYPASS
Figure 42. LP2992 SOT-23 Package Typical Layout
V_BYPASS
1
6
C_BYPASS
Power Ground 2
GND
5
V_ON/OFF
3
4
V_OUT
C_OUT
C_IN
V_IN
Figure 43. LP2992 WSON Package Typical Layout
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