LP2985_15 Datasheet, PDF (12/29 Pages) Texas Instruments – 150-mA Low-noise Low-dropout Regulator With Shutdown

LP2985
SLVS522O – JULY 2004 – REVISED JANUARY 2015
8 Application and Implementation
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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 following application schematic shows the standard usage of the LP2985 as a low-dropout regulator.
8.1.1 Typical Application
V_IN
1 µF
LP2985
1
5
2.2 µF
V_OUT
GND
2
ON/OFF
3
4
BYPASS
10 nF
8.1.2 Design Requirements
Minimum C_OUT value for stability (can be increased without limit for improved stability and transient response)
ON/OFF must be actively terminated. Connect to V_IN if shutdown feature is not used.
Optional BYPASS capacitor for low-noise operation
8.1.3 Capacitors
8.1.3.1 Input Capacitor (C_IN)
A minimum value of 1 μF (over the entire operating temperature range) is required at the input of the LP2985. In
addition, this input capacitor should be located within 1 cm of the input pin and connected to a clean analog
ground. There are no equivalent series resistance (ESR) requirements for this capacitor, and the capacitance
can be increased without limit.
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