8.2 Typical Application

Figure 8-2 shows the standard usage of the LP2985 as a low-dropout regulator.

VOUT

2.2 µF

10 nF

1 µF

VIN

1

ON/OFF

2

GND

3

5

4

BYPASS

LP2985

Figure 8-2. LP2985 Typical Application

8.2.1 Design Requirements

Minimum COUT value for stability (can be increased without limit for improved stability and transient response)

ON/OFF must be actively terminated. Connect to VIN if shutdown feature is not used.

Optional BYPASS capacitor for low-noise operation.

8.2.2 Detailed Design Procedure

8.2.2.1 ON/OFF Operation

The LP2985 allows for a shutdown mode via the ON/OFF pin. Driving the pin LOW (≤ 0.4 V) turns the device

OFF; conversely, a HIGH (≥ 1.2 V) turns the device ON. If the shutdown feature is not used, connect ON/OFF to

the input to ensure that the regulator is on at all times. For proper operation, do not leave ON/OFF unconnected.

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LP2985

SLVS522Q – JULY 2004 – REVISED DECEMBER 2022

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Product Folder Links: LP2985