Datasheet

LP3999
www.ti.com SNVS207E –JUNE 2003–REVISED MAY 2013
Electrical Characteristics (continued)
Unless otherwise noted, V
EN
= 1.5, V
IN
= V
OUT(NOM)
+ 1.0V, C
IN
= 1 µF, I
OUT
= 1 mA, C
OUT
= 1 µF, C
BP
= 0.01 µF. Typical
values and limits appearing in normal type apply for T
J
= 25°C. Limits appearing in boldface type apply over the full
temperature range for operation, −40 to +125°C.
(1) (2)
Limit
Symbol Parameter Conditions Typical Units
Min Max
V
DO
Dropout Voltage I
OUT
= 1 mA 0.4 2
mV
I
OUT
= 150 mA 60 100
PSRR Power Supply Rejection Ratio
(3)
f = 1 kHz, I
OUT
= 1 mA 60
dB
f = 10 kHz, I
OUT
= 1 mA 50
FULL V
OUT
RANGE
I
LOAD
Load Current See
(4)
and
(3)
0 µA
I
Q
Quiescent Current V
EN
= 1.5V, I
OUT
= 0 mA 85 150
V
EN
= 1.5V, I
OUT
= 150 mA 140 200 µA
V
EN
= 0.4V 0.003 1.5
I
SC
Short Circuit Current Limit 450 mA
E
N
Output Noise Voltage
(3)
BW = 10 Hz to 100 kHz,
10
V
IN
= 4.2V, No Load
µVrms
BW = 10 Hz to 100 kHz, 30
V
IN
= 4.2V, 1mA Load
T
SHUTDOWN
Thermal Shutdown Temperature 160 °C
Hysteresis 20
ENABLE CONTROL CHARACTERISTICS
I
EN
Maximum Input Current at V
EN
V
EN
= 0.0V and V
IN
= 6.0V
0.001 µA
Input
V
IL
Low Input Threshold 0.4 V
V
IH
High Input Threshold 0.9 V
TIMING CHARACTERISTICS
T
ON
Turn On Time
(5)
To 95% Level
(6)
140 µs
(4) The device maintains the regulated output voltage without load.
(5) This electrical specification is ensured by design.
(6) Time from V
EN
= 0.9V to V
OUT
= 95% (V
OUT(NOM)
)
Recommended Output Capacitor
Limit
Symbol Parameter Conditions Typical Units
Min Max
C
OUT
Output Capacitor Capacitance
(1)
1.0 0.70 µF
ESR 5 500 mΩ
(1) The capacitor tolerance should be 30% or better over temperature. Recommended capacitor type is X7R however dependant on
application X5R,Y5V and Z5U can also be used.
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