Datasheet

LP3988
SNVS161D –OCTOBER 2001–REVISED MAY 2013 www.ti.com
ELECTRICAL CHARACTERISTICS
Unless otherwise specified: V
EN
= 1.8V, V
IN
= V
OUT
+ 0.5V, C
IN
= 1 µF, I
OUT
= 1mA, C
OUT
= 1 µF. Typical values and limits
appearing in standard typeface are for T
J
= 25°C. Limits appearing in boldface type apply over the entire junction
temperature range for operation, −40°C to +125°C.
(1) (2)
Limit
Symbol Parameter Conditions Typ Units
Min Max
Output Voltage −2 2
Tolerance −20°C ≦ T
J
≦ 125°C, SOT-23-5 −3 3
% of
−40°C ≦ T
J
≦ 125°C, SOT-23-5 −3.5 3.5
V
OUT(nom)
−40°C ≦ T
J
≦ 125°C, DSBGA -3 3
ΔV
OUT
Line Regulation Error −0.15 0.15
V
IN
= V
OUT (NOM)
+ 0.5V to 6.0V %/V
−0.2 0.2
Load Regulation Error I
OUT
= 1 mA to 150 mA 0.005
%/mA
(3)
0.007
V
IN
= V
OUT(nom)
+ 1V, 65
f = 1 kHz,
I
OUT
= 50 mA (Figure 5)
PSRR Power Supply Rejection Ratio dB
V
IN
= V
OUT(nom)
+ 1V, 45
f = 10 kHz,
I
OUT
= 50 mA (Figure 5)
I
Q
Quiescent Current V
EN
= 1.4V, I
OUT
= 0 mA 85 120
V
EN
= 1.4V, I
OUT
= 0 to 150 mA 140 200 µA
V
EN
= 0.4V 0.003 1.0
Dropout Voltage
(4)
I
OUT
= 1 mA 1 5
mV
I
OUT
= 150 mA 80 115
150
I
SC
Short Circuit Current Limit
(5)
600 mA
e
n
Output Noise Voltage BW = 10 Hz to 100 kHz, 220
µVrms
C
OUT
= 1µF
Output Capacitor Capacitance
(6)
1 20 µF
C
OUT
ESR
(6)
5 500 mΩ
Thermal Shutdown Temperature 160 °C
TSD
Thermal Shutdown Hysteresis 20 °C
Enable Control Characteristics
I
EN
Maximum Input Current at EN V
EN
= 0 and V
IN
= 6.0V 0.1 µA
V
IL
Logic Low Input threshold V
IN
= 2.5V to 6.0V 0.5 V
V
IH
Logic High Input threshold V
IN
= 2.5V to 6.0V 1.2 V
(1) All electrical characteristics having room-temperature limits are tested during production with T
J
= 25°C or correlated using Statistical
Quality Control (SQC) methods. All hot and cold limits are specified by correlating the electrical characteristics to process and
temperature variations and applying statistical process control.
(2) The target output voltage, which is labeled V
OUT(nom)
, is the desired voltage option.
(3) An increase in the load current results in a slight decrease in the output voltage and vice versa.
(4) Dropout voltage is the input-to-output voltage difference at which the output voltage is 100 mV below its nominal value.
(5) Short circuit current is measured on input supply line after pulling down V
OUT
to 95% V
OUT(nom)
.
(6) Specified by design. Not production tested. The capacitor tolerance should be ±30% or better over the full temperature range. The full
range of operating conditions such as temperature, DC bias and even capacitor case size for the capacitor in the application should be
considered during device selection to ensure this minimum capacitance specification is met. X7R capacitor types are recommended to
meet the full device temperature range.
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