LP2981-29 Datasheet, PDF (2/14 Pages) Texas Instruments – 100-mA ULTRA-LOW DROPOUT REGULATOR WITH SHUTDOWN

LP2981-29, LP2981-50, LP2981A-29, LP2981A-50
100-mA ULTRA-LOW DROPOUT REGULATOR
WITH SHUTDOWN
SLVS768 – MARCH 2007
FUNCTIONAL BLOCK DIAGRAM
V_IN
ON/OFF
V_REF
1.23 V
−
+
R₂
R₁
Overcurrent/
Overtemperature
Protection
V_OUT
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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.
2
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