LP2985 Datasheet, PDF (3/24 Pages) National Semiconductor (TI) – Micropower 150 mA Low-Noise Ultra Low-Dropout Regulator Designed for Use with Very Low ESR Output Capacitors

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ON/OFF
BYPASS
LP2985
150-mA LOW-NOISE LOW-DROPOUT REGULATOR
WITH SHUTDOWN
SLVS522F – JULY 2004 – REVISED AUGUST 2005
FUNCTIONAL BLOCK DIAGRAM
V_IN
V_REF
1.23 V
−
+
Overcurrent/
Overtemperature
Protection
V_OUT
V_IN
GND
BASIC APPLICATION CIRCUIT
LP2985
1
5
1 µF
(see Note A)
2
2.2 µF
(see Note A)
V_OUT
ON/OFF
(see Note B)
3
4
BYPASS
10 nF
(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. Optional BYPASS capacitor for low-noise operation
3