Datasheet

LP3997
SNVS272B –MAY 2004–REVISED MAY 2013 www.ti.com
Electrical Characteristics
Unless otherwise noted, SD = 950mV, V
IN
= V
OUT
+ 1.0V, C
IN
= 2.2 µF, I
OUT
= 1 mA, C
OUT
= 2.2 µF and C
BYP
= 0.1 µF.
Typical values and limits appearing in normal type apply for T
J
= 27°C. Limits appearing in boldface type apply over the full
temperature range for operation, −40 to +125°C.
(1)
Limit
Symbol Parameter Test Conditions Typ Unit
Min Max
V
IN
Input Voltage 2 6 V
ΔV
OUT
Output Voltage Tolerance Over full line and load regulation -1.5 +1.5 %
-3 +3
Line Regulation Error V
IN
= (V
OUT(NOM)
+ 1.0V) to 6.0V,
0.02 0.3 %/V
I
OUT
= 1mA
Load Regulation Error I
OUT
= 1mA to 250mA 20 80 µV/mA
V
DO
Dropout Voltage
(2)
I
OUT
= 250mA 140 400 mV
I
LOAD
Load Current See
(3) (4)
0 µA
I
Q
Quiescent Current SD = 950mV, I
OUT
= 0mA 55 100
SD = 950mV, I
OUT
= 250mA 80 150 µA
SD = 0.4V 0.01 0.5
I
SC
Short Circuit Current Limit See
(5)
600 1000 mA
I
OUT
Maximum Output Current 250 mA
PSRR Power Supply Rejection Ratio C
BYP
= 0.1µF f = 1kHz, I
OUT
= 61
1mA to 150mA
f = 10kHz, I
OUT
= 55
150mA
dB
Without C
BYP
f = 1kHz, I
OUT
= 61
1mA to 150mA
f = 10kHz, I
OUT
= 39
150mA
w/o C
BYP
180
BW = 10Hz to 100kHz,
e
n
Output noise Voltage
(4)
µV
RMS
V
IN
= V
OUT(nom)
+1V
C
BYP
= 0.1µF 100
T
SHUTDOWN
Thermal Shutdown Temperature 150
°C
Hysteresis 10
Shutdown Control Characteristics
I
SD
Maximum Input Current at SD SD = 0.0V 0.01
µA
Input
SD = 6V
(6)
1
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
Error Flag Characteristics
V
TH
Power Good Trip Threshold V
IN
Rising 95 91 99 %V
OUT
V
HYST
Hysteresis V
IN
Rising or Falling 2.5 %V
OUT
V
OL
ErrorError OutputOutput low I
SINK
= 2mA 0.1 0.4
V
Voltage
I
OFF
Error Output High Leakage ERROR = V
OUT(NOM)
10 2000 nA
I
DELAY
Delay Pin Current Source V
OUT
> 95% V
OUT(NOM)
2.2 1.2 3 µA
(1) All limits are ensured. 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 ensured by correlating the electrical
characteristics to process and temperature variations and applying statistical process control.
(2) Dropout voltage is defined as the voltage difference between input and output when the output voltage drops 100mV below its nominal
value.
(3) The device maintains the regulated output voltage without the load.
(4) This electrical specification is ensured by design.
(5) Short circuit current is measured on the input supply line at the point when the short circuit condition reduces the output voltage to 5% of
its nominal value.
(6) SD Pin has 6MΩ typical, resistor connected to GND.
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