Datasheet
LP5951
SNVS345F –JUNE 2006–REVISED MAY 2013
www.ti.com
Electrical Characteristics
(1) (2)
Typical values and limits appearing in standard typeface are for T
A
= 25°C. Limits appearing in boldface type apply over the
full operating temperature range: -40°C ≤ T
J
≤ +125°C. Unless otherwise noted, V
IN
= V
OUT(NOM)
+ 1V, C
IN
= 1µF, C
OUT
= 1µF,
V
EN
= 0.9V.
Symbol Parameter Condition Typ Limit Units
Min Max
V
IN
Input Voltage V
IN
≥ V
OUT(NOM)
+ V
DO
1.8 5.5 V
I
OUT
= 1mA -2.0 2.0 %
Output Voltage Tolerance
-30°C ≤ T
J
≤ +125°C -3.5 3.5 %
Line Regulation Error V
IN
= V
OUT(NOM)
+ 1V to 5.5V 0.1 %/V
ΔV
OUT
I
OUT
= 1mA
Load Regulation Error I
OUT
= 1mA to 150mA -0.01 %/mA
V
DO
Output Voltage Dropout I
OUT
= 150mA
(3)
V
OUT
≥ 2.5V 250 mV
V
OUT
< 2.5V 200 350 mV
I
Q
Quiescent Current V
EN
= 0.9V, I
LOAD
= 0 29 55 µA
V
EN
= 0.9V, I
LOAD
= 150mA 33 70 µA
V
EN
= 0V 0.005 1 µA
I
SC
Output Current V
IN
= V
OUT(NOM)
+ 1V 400 150 mA
(short circuit)
PSRR Power Supply Sine modulated V
IN
Rejection Ratio f = 100Hz 60 dB
f = 1kHz 60 dB
f = 10kHz 50 dB
E
N
Output Noise BW = 10Hz - 100kHz 125 µV
RMS
TSD Thermal Shutdown 160 °C
Temperature Hysteresis 20 °C
(1) All voltages are with respect to the potential at the GND pin.
(2) Min and Max limits are ensured by design, test, or statistical analysis. Typical numbers are not ensured, but do represent the most likely
norm.
(3) Dropout voltage is defined as the input to output voltage differential at which the output voltage falls to 100mV below the nominal output
voltage. This specification does not apply for output voltages below 1.8V.
Enable Control Characteristics
Symbol Parameter Conditions Typical Limit Units
Min Max
I
EN
Maximum Input Current at 0V ≤ V
EN
≤ V
IN
, V
IN
= 5.5V -1 1 µA
V
EN
Input
V
IL
Low Input Threshold V
IN
= 1.8..5.5V 0.4 V
(shutdown)
V
IH
High Input Threshold V
IN
= 1.8..5.5V 0.9 V
(enable)
Transient Characteristics
Symbol Parameter Conditions Typical Limit Units
Min Max
ΔV
OUT
Dynamic Line Transient V
IN
= V
OUT(NOM)
+ 1V to ±2 mV
V
OUT(NOM)
+ 1V + 0.6V in 30µs, no load
ΔV
OUT
Dynamic Load I
OUT
= 0mA to 150mA in 10µs -30 mV
Transient I
OUT
= 150mA to 0mA in 10µs 20 mV
I
OUT
= 1mA to 150mA in 1µs -50 mV
I
OUT
= 150mA to 1mA in 1µs 40 mV
ΔV
OUT
Overshoot on Startup Nominal conditions 10 mV
T
ON
Turn on time I
OUT
= 1mA 30 µs
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