Datasheet
2
LT1120A
1120afa
(Note 1)
Input Voltage ........................................................... 36V
NPN Collector Voltage ............................................. 36V
Output Short-Circuit Duration.......................... Indefinite
Power Dissipation............................... Internally Limited
Operating Temperature Range
LT1120AC ............................................. 0°C to 100°C
LT1120AI......................................... –40°C to 100°C
Storage Temperature Range ................. –65°C to 150°C
ABSOLUTE MAXIMUM RATINGS
W
WW
U
PACKAGE/ORDER INFORMATION
W
U
U
ORDER PART
NUMBER
LT1120ACN8
LT1120ACS8
LT1120AIS8
T
J
= 25°C
T
JMAX
= 110°C, θ
JA
= 130°C/W (N)
T
JMAX
= 110°C, θ
JA
= 190°C/W (S)
1
2
3
4
8
7
6
5
TOP VIEW
GND
FEEDBACK
SHUTDOWN
V
OUT
–INPUT
COMP OUT
REF
V
IN
N8 PACKAGE
8-LEAD PDIP
S8 PACKAGE
8-LEAD PLASTIC SO
S8 PART
MARKING
1120A
1120AI
Consult LTC Marketing for parts specified with wider operating temperature ranges.
PARAMETER CONDITIONS MIN TYP MAX UNITS
Reference
Reference Voltage 4.5V ≤ V
IN
≤ 36V 2.46 2.50 2.54 V
Line Regulation 4.5V ≤ V
IN
≤ 36V 0.01 0.015 %/V
Load Regulation –2.0mA ≤ I
REF
≤ 2mA, V
IN
= 12V 0.3 0.6 %
Output Source Current V
IN
= 5V 2 4 mA
Output Sink Current V
IN
= 5V 2 4 mA
Temperature Stability 1%
Regulator
Supply Current V
IN
= 6V, I
OUT
≤ 100mA 20 25 µA
V
IN
= 36V, I
OUT
≤ 100mA 30 40 µA
V
IN
= 12V, I
OUT
= 125mA 11 20 mA
Output Current (V
IN
– V
OUT
) ≥ 1V, V
IN
≥ 6V 125 mA
Load Regulation (V
IN
– V
OUT
) ≥ 1V, V
IN
≥ 6V 0.2 0.5 %
Line Regulation 6V ≤ V
IN
≤ 36V 0.01 0.015 %/V
Dropout Voltage I
OUT
= 100mA 0.02 0.05 V
I
OUT
= 125mA 0.40 0.65 V
Feedback Sense Voltage V
IN
= 12V 2.44 2.5 2.56 V
Shutdown Pin Voltage Normal 0.4 V
V
OUT
≤ 0.5V Shutdown 2.2 1.4 V
Shutdown Pin Current V
IN
= 1.4V 10 µA
Feedback Bias Current 15 40 nA
Minimum Load Current V
IN
= 36V 1 5 µA
Short-Circuit Current V
IN
= 36V 250 400 mA
Comparator
Offset Voltage V
IN
= 36V 3 7 mV
Bias Current V
IN
= 36V 15 40 nA
Gain ∆V
OUT
= 29V, R
L
= 20k 2000 10000 V/V
Power Supply Rejection 4.5V ≤ V
S
≤ 36V 80 96 dB
Output Sink Current V
IN
= 4.5V 10 18 mA
Saturation Voltage I
OUT
= 1mA 0.4 0.6 V
Input Voltage Range 0 V
IN
– 1 V
Response Time 5 µs
Leakage Current V
IN
= 36V, V(Pin 7) = 36V 2 µA
ELECTRICAL CHARACTERISTICS