LP2981 Datasheet, PDF (3/17 Pages) National Semiconductor (TI) – Micropower 100 mA Ultra Low-Dropout Regulator

LP2981
www.ti.com ......................................................................................................................................................... SLVS521F – JULY 2004 – REVISED AUGUST 2008
FUNCTIONAL BLOCK DIAGRAM
V_IN
ON/OFF
V_REF
1.23 V
−
+
R₂
R₁
Overcurrent/
Overtemperature
Protection
V_OUT
V_IN
GND
GND
BASIC APPLICATION CIRCUIT
LP2981
1
5
1 µF
(see Note A)
2
3.3 µF
(see Note A)
V_OUT
ON/OFF
(see Note B)
3
4
NC
(see Note C)
A. Minimum C_OUT value for stability (can be increased without limit for improved stability and transient response)
B. ON/OFF must be actively terminated. Connect to V_IN if shutdown feature is not used.
C. Pin 4 (NC) must be left open. Do not connect anything to this pin.
Figure 1.
Copyright © 2004–2008, Texas Instruments Incorporated
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