LP3982
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SNVS185D –FEBRUARY 2002–REVISED APRIL 2013
ELECTRICAL CHARACTERISTICS (continued)
Unless otherwise specified, all limits specified for VIN = VO +0.5V(1), VSHDN = VIN, CIN = COUT = 2.2μF, CCC = 33nF, TJ = 25°C.
Boldface limits apply for the operating temperature extremes: −40°C and 85°C.
Symbol
VDO
Parameter
Dropout Voltage(1)(4)
Conditions
Min(2)
−0.1
2
Typ(3)
Max(2)
Units
IOUT = 1 mA
0.4
IOUT = 200 mA
80
220
mV
IOUT = 300 mA
120
0.01
0.002
37
ΔVO
en
Line Regulation
IOUT = 1 mA, (VO + 0.5V) ≤ VI ≤ 6V(1)
100 μA ≤ IOUT ≤ 300 mA
IOUT = 10 mA, 10 Hz ≤ f ≤ 100 kHz
10 Hz ≤ f ≤ 100 kHz, COUT = 10 μF
VIH, (VO + 0.5V) ≤ VI ≤ 6V(1)
VIL, (VO + 0.5V) ≤ VI ≤ 6V(1)
SHDN = GND or IN
0.1
%/V
Load Regulation
%/mA
μVRMS
nV/√Hz
Output Voltage Noise
Output Voltage Noise Density
SHDN Input Threshold
190
VSHDN
V
0.4
100
2.5
ISHDN
ISET
SHDN Input Bias Current
SET Input Leakage
0.1
0.1
nA
nA
mV
V
SET = 1.3V, Adjust Version Only(5)
VFAULT
FAULTDetection Voltage
FAULT Output Low Voltage
FAULT Off-Leakage Current
Thermal Shutdown Temperature
Thermal Shutdown Hysteresis
Start-Up Time
V
O ≥ 2.5V, IOUT = 200 mA(6)
120
0.115
0.1
280
0.25
100
ISINK = 2 mA
IFAULT
TSD
FAULT = 3.6V, SHDN = 0V
nA
160
10
°C
TON
COUT = 10 μF, VO at 90% of Final
120
μs
Value
(4) Dropout voltage is measured by reducing VIN until VO drops 100mV from its nominal value at VIN -VO = 0.5V. Dropout Voltage does not
apply to the 1.8 version.
(5) The SET pin is not externally connected for the fixed versions.
(6) The FAULT detection voltage is specified for the input to output voltage differential at which the FAULT pin goes active low.
FUNCTIONAL BLOCK DIAGRAM
V
IN
V
O
FAST
START-UP
CIRCUIT
CURRENT
LIMIT
R1
+
-
SET
CC
ERROR
AMP
FAULT
COMPARATORS
FAULT
SHDN
OFF
R2
1.25V
BANDGAP
THERMAL
PROTECTION
GND
Figure 1.
Copyright © 2002–2013, Texas Instruments Incorporated
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