LP2950 Datasheet, PDF (10/14 Pages) National Semiconductor (TI) – Series of Adjustable Micropower Voltage Regulators

LP2950/2951
OUTPUT
VOLTAGE
4.75V
*
ERROR ^NOT
VALID
*
NOT
VALID
INPUT
VOLTAGE
5V
1.3V
* SEE APPLICATIONS INFORMATION
Figure 1. ERROR Output Timing
Typical Applications
Micrel
100kΩ
+VIN
8
VIN
*SEE APPLICATIONS
INFORMATION
VOUT = V _REF
x (1 +
R1
R2
)
VOUT
ERROR
OUTPUT
5 _ERROR
VOUT ¹
L^LP^P2²9⁹5⁵1¹
1.2 30V
SHUTDOWN
INPUT
3
SD
OFF
GND
ON
4
FB
7
1.23V
3.3µF
R1 100
pF
NOTE: PINS 2 AND 6 ARE LEFT OPEN
VREF
R2
Figure 2. Adjustable Regulator
+VIN
8
ERROR
OUTPUT
+VIN
5 _{ERROR VOUT} ^{1 *VOUT ≈VIN}
LP2951
SHUTDOWN 3
SO
INPUT
GND FB
4
7
*MINIMUM INPUT-OUTPUT VOLTAGE RANGES FROM 40mV TO 400mV,
DEPENDING ON LOAD CURRENT. CURRENT LIMIT IS TYPICALLY 160mA.
*SLEEP
INPUT
+V _IN
C-MOS
GATE
870 23
47kΩ
8
+V _IN
ERROR
OUTPUT
5 _ERROR
VOUT ¹
MLPIC2299551
SHUTDOWN ³
INPUT
SD
OFF
GND
FB
ON
4
7
470 kΩ
+V _OUT
2N3906
100pF
200kΩ
1% ₊
100kΩ
3.3µF
1%
100kΩ
*HIGH INPUT LOWERS V_OUT TO 2.5V
Wide Input Voltage Range Current Limiter
5 V Regulator with 2.5 V Sleep Function
3-44
February 1999