Datasheet

LP3990
www.ti.com SNVS251I –MAY 2004–REVISED MAY 2013
Electrical Characteristics
Unless otherwise noted, V
EN
=950mV, V
IN
= V
OUT
+ 1.0V, or 2.0V, whichever is higher. C
IN
= 1 µF, I
OUT
= 1 mA, C
OUT
=0.47
µF.
Typical values and limits appearing in normal type apply for T
J
= 27°C. Limits appearing in boldface type apply over the full
junction temperature range for operation, −40 to +125°C.
(1)
Limit
Symbol Parameter Conditions Typ Units
Min Max
V
IN
Input Voltage
(2)
2 6 V
ΔV
OUT
Output Voltage Tolerance I
LOAD
= 1 mA DSBGA -1 +1
WQFN -1.5 +1.5
SOT-23 -1.5 +1.5
%
Over full line DSBGA -2.5 +2.5
and load
WQFN -3 +3
regulation.
SOT-23 -4 +4
Line Regulation Error V
IN
= (V
OUT(NOM)
+ 1.0V) to 6.0V, 0.02 -0.1 0.1 %/V
Load Regulation Error I
OUT
= 1mA V
OUT
= 0.8 to 1.95V 0.002 -0.005 0.005
to 150mA DSBGA
V
OUT
= 0.8 to 1.95V 0.003 -0.008 0.008
WQFN, SOT-23
%/mA
V
OUT
= 2.0 to 3.3V 0.0005 -0.002 0.002
DSBGA
V
OUT
= 2.0 to 3.3V 0.002 -0.005 0.005
WQFN, SOT-23
V
DO
Dropout Voltage I
OUT
= 150mA
(3) (4)
120 200 mV
I
LOAD
Load Current See
(5) (4)
0 µA
I
Q
Quiescent Current V
EN
= 950mV, I
OUT
= 0mA 43 80
V
EN
= 950mV, I
OUT
= 150mA 65 120 µA
V
EN
= 0.4V 0.002 0.2
I
SC
Short Circuit Current Limit See
(6)
550 1000 mA
I
OUT
Maximum Output Current 150 mA
PSRR Power Supply Rejection Ratio f = 1kHz, I
OUT
= 1mA to 150mA 55
dB
f = 10kHz, I
OUT
= 150mA 35
V
OUT
= 0.8 60
BW = 10Hz to
e
n
Output noise Voltage
(4)
V
OUT
= 1.5 125 µV
RMS
100kHz,
V
OUT
= 3.3 180
T
SHUTDOWN
Thermal Shutdown Temperature 155
°C
Hysteresis 15
Enable Control Characteristics
I
EN
(7)
Maximum Input Current at V
EN
V
EN
= 0.0V 0.001 0.1
µA
Input
V
EN
= 6V 6 2.5 10
V
IL
Low Input Threshold V
IN
= 2V to 6V 0.4 V
V
IH
High Input Threshold V
IN
= 2V to 6V 0.95 V
(1) All limits are guaranteed. All electrical characteristics having room-temperature limits are tested during production at T
J
= 25°C or
correlated using Statistical Quality Control methods. Operation over the temperature specification is guaranteed by correlating the
electrical characteristics to process and temperature variations and applying statistical process control.
(2) V
IN(MIN)
= V
OUT(NOM)
+ 0.5V, or 2.0V, whichever is higher.
(3) Dropout voltage is voltage difference between input and output at which the output voltage drops to 100mV below its nominal value.
This parameter only for output voltages above 2.0V.
(4) This electrical specification is guaranteed by design.
(5) The device maintains the regulated output voltage without the load.
(6) Short circuit current is measured with V
OUT
pulled to 0V and V
IN
worst case = 6.0V.
(7) Enable Pin has 1MΩ typical, resistor connected to GND.
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