Datasheet

OFF
THERMAL
PROTECTION
1.25V
BANDGAP
FAST
START-UP
CIRCUIT
CURRENT
LIMIT
FAULT
COMPARATORS
R1
R2
V
IN
V
O
SET
CC
SHDN
FAULT
GND
ERROR
AMP
+
-
LP3982
www.ti.com SNVS185D –FEBRUARY 2002–REVISED APRIL 2013
ELECTRICAL CHARACTERISTICS (continued)
Unless otherwise specified, all limits specified for V
IN
= V
O
+0.5V
(1)
, V
SHDN
= V
IN
, C
IN
= C
OUT
= 2.2μF, C
CC
= 33nF, T
J
= 25°C.
Boldface limits apply for the operating temperature extremes: −40° C and 85°C.
Symbol Parameter Conditions Min
(2)
Typ
(3)
Max
(2)
Units
V
DO
Dropout Voltage
(1)(4)
I
OUT
= 1 mA 0.4
I
OUT
= 200 mA 80 220 mV
I
OUT
= 300 mA 120
ΔV
O
Line Regulation I
OUT
= 1 mA, (V
O
+ 0.5V) ≤ V
I
≤ 6V
(1)
−0.1 0.01 0.1 %/V
Load Regulation 100 μA ≤ I
OUT
≤ 300 mA 0.002 %/mA
e
n
Output Voltage Noise I
OUT
= 10 mA, 10 Hz ≤ f ≤ 100 kHz 37 μV
RMS
Output Voltage Noise Density 10 Hz ≤ f ≤ 100 kHz, C
OUT
= 10 μF 190 nV/√Hz
V
SHDN
SHDN Input Threshold V
IH
, (V
O
+ 0.5V) ≤ V
I
≤ 6V
(1)
2
V
V
IL
, (V
O
+ 0.5V) ≤ V
I
≤ 6V
(1)
0.4
I
SHDN
SHDN Input Bias Current SHDN = GND or IN 0.1 100 nA
I
SET
SET Input Leakage SET = 1.3V, Adjust Version Only
(5)
0.1 2.5 nA
V
FAULT
FAULTDetection Voltage V
O
≥ 2.5V, I
OUT
= 200 mA
(6)
120 280 mV
FAULT Output Low Voltage I
SINK
= 2 mA 0.115 0.25 V
I
FAULT
FAULT Off-Leakage Current FAULT = 3.6V, SHDN = 0V 0.1 100 nA
T
SD
Thermal Shutdown Temperature 160
°C
Thermal Shutdown Hysteresis 10
T
ON
Start-Up Time C
OUT
= 10 μF, V
O
at 90% of Final 120 μs
Value
(4) Dropout voltage is measured by reducing V
IN
until V
O
drops 100mV from its nominal value at V
IN
-V
O
= 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
Figure 1.
Copyright © 2002–2013, Texas Instruments Incorporated Submit Documentation Feedback 3
Product Folder Links: LP3982