LT1121C-X ............................................ 0°C to 125°C
LT1121I-X ........................................ – 40°C to 125°C
Storage Temperature Range ..................– 65°C to 150°C
Lead Temperature (Soldering, 10 sec)................... 300°C
PIN CONFIGURATION
TOP VIEW
OUT 1
NC/ADJ* 2
GND 3
NC 4
N8 PACKAGE
8-LEAD PDIP
S8 PACKAGE
8-LEAD PLASTIC SO
T
JMAX
= 150°C,
θ
JA
= 120°C/W (N8, S8)
T
JMAX
= 150°C,
θ
JA
= 70°C/W (AS8)
8 IN
7 NC**
6 NC**
5
SHDN
* PIN 2 = NC FOR LT1121-3.3/LT1121-5
= ADJ FOR LT1121
** PINS 6 AND 7 ARE FLOATING (NO
INTERNAL CONNECTION) ON THE
STANDARD S8 PACKAGE.
PINS 6 AND 7 CONNECTED TO GROUND
ON THE A VERSION OF THE LT1121 (S8 ONLY).
CONNECTING PINS 6 AND 7 TO THE
GROUND PLANE WILL REDUCE THERMAL
RESISTANCE. SEE THERMAL RESISTANCE
TABLES IN THE APPLICATIONS INFORMATION
SECTION.
FRONT VIEW
3
TAB IS
GND
2
1
OUTPUT
GND
V
IN
Z PACKAGE
3-LEAD PLASTIC TO-92
T
JMAX
= 150°C,
θ
JA
= 150°C/W
IN
GND
OUT
BOTTOM VIEW
ST PACKAGE
3-LEAD PLASTIC SOT-223
T
JMAX
= 150°C,
θ
JA
= 50°C/W
ORDER INFORMATION
LEAD FREE FINISH
LT1121CN8#PBF
LT1121CN8-3.3#PBF
LT1121CN8-5#PBF
LT1121IN8#PBF
LT1121IN8-3.3#PBF
LT1121IN8-5#PBF
LT1121CS8#PBF
LT1121CS8-3.3#PBF
LT1121CS8-5#PBF
LT1121HVCS8#PBF
LT1121IS8#PBF
LT1121IS8-3.3#PBF
LT1121IS8-5#PBF
LT1121HVIS8#PBF
LT1121ACS8#PBF
LT1121ACS8-3.3#PBF
LT1121ACS8-5#PBF
TAPE AND REEL
LT1121CN8#TRPBF
LT1121CN8-3.3#TRPBF
LT1121CN8-5#TRPBF
LT1121IN8#TRPBF
LT1121IN8-3.3#TRPBF
LT1121IN8-5#TRPBF
LT1121CS8#TRPBF
LT1121CS8-3.3#TRPBF
LT1121CS8-5#TRPBF
LT1121HVCS8#TRPBF
LT1121IS8#TRPBF
LT1121IS8-3.3#TRPBF
LT1121IS8-5#TRPBF
LT1121HVIS8#TRPBF
LT1121ACS8#TRPBF
LT1121ACS8-3.3#TRPBF
LT1121ACS8-5#TRPBF
PART MARKING
LT1121CN8
LT1121CN8-3.3
LT1121CN8-5
LT1121IN8
LT1121IN8-3.3
LT1121IN8-5
1121
11213
11215
1121HV
1121I
121I3
121I5
121HVI
1121A
1121A3
1121A5
PACKAGE DESCRIPTION
8-Lead Plastic PDIP
8-Lead Plastic PDIP
8-Lead Plastic PDIP
8-Lead Plastic PDIP
8-Lead Plastic PDIP
8-Lead Plastic PDIP
8-Lead Plastic S0
8-Lead Plastic S0
8-Lead Plastic S0
8-Lead Plastic S0
8-Lead Plastic S0
8-Lead Plastic S0
8-Lead Plastic S0
8-Lead Plastic S0
8-Lead Plastic S0
8-Lead Plastic S0
8-Lead Plastic S0
TEMPERATURE RANGE
0°C to 125°C
0°C to 125°C
0°C to 125°C
–40°C to 125°C
–40°C to 125°C
–40°C to 125°C
0°C to 125°C
0°C to 125°C
0°C to 125°C
–40°C to 125°C
–40°C to 125°C
–40°C to 125°C
–40°C to 125°C
–40°C to 125°C
0°C to 125°C
0°C to 125°C
0°C to 125°C
1121fg
2
LT1121/LT1121-3.3/LT1121-5
ORDER INFORMATION
LEAD FREE FINISH
LT1121AHVCS8#PBF
LT1121AIS8#PBF
LT1121AIS8-3.3#PBF
LT1121AIS8-5#PBF
LT1121AHVIS8#PBF
LT1121CST-3.3#PBF
LT1121IST-3.3#PBF
LT1121CST-5#PBF
LT1121IST-5#PBF
LT1121CZ3-3#PBF
LT1121IZ3-3#PBF
LT1121CZ-5#PBF
LT1121IZ-5#PBF
TAPE AND REEL
LT1121AHVCS8#TRPBF
LT1121AIS8#TRPBF
LT1121AIS8-3.3#TRPBF
LT1121AIS8-5#TRPBF
LT1121AHVIS8#TRPBF
LT1121CST-3.3#TRPBF
LT1121IST-3.3#TRPBF
LT1121CST-5#TRPBF
LT1121IST-5#TRPBF
LT1121CZ3-3#TRPBF
LT1121IZ3-3#TRPBF
LT1121CZ-5#TRPBF
LT1121IZ-5#TRPBF
PART MARKING
121AHV
121AI
121AI3
121AI5
21AHVI
11213
121I3
11215
1121I5
LT1121CZ3-3
LT1121IZ3-3
LT1121CZ-5
LT1121IZ-5
PACKAGE DESCRIPTION
8-Lead Plastic S0
8-Lead Plastic S0
8-Lead Plastic S0
8-Lead Plastic S0
8-Lead Plastic S0
3-Lead Plastic SOT-223
3-Lead Plastic SOT-223
3-Lead Plastic SOT-223
3-Lead Plastic SOT-223
3-Lead Plastic TO-92
3-Lead Plastic TO-92
3-Lead Plastic TO-92
3-Lead Plastic TO-92
TEMPERATURE RANGE
0°C to 125°C
–40°C to 125°C
–40°C to 125°C
–40°C to 125°C
–40°C to 125°C
0°C to 125°C
–40°C to 125°C
0°C to 125°C
–40°C to 125°C
0°C to 125°C
–40°C to 125°C
0°C to 125°C
–40°C to 125°C
Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.
Consult LTC Marketing for information on nonstandard lead based finish parts.
For more information on lead free part marking, go to:
http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to:
http://www.linear.com/tapeandreel/
ELECTRICAL CHARACTERISTICS
PARAMETER
Regulated Output Voltage (Note 4)
CONDITIONS
LT1121-3.3
LT1121-5
LT1121 (Note 5)
Line Regulation
The
l
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C.
MIN
V
IN
= 3.8V, I
OUT
= 1mA, T
J
= 25ºC
4.3V < V
IN
< 20V, 1mA < I
OUT
< 150mA
V
IN
= 5.5V, I
OUT
= 1mA, T
J
= 25ºC
6V < V
IN
< 20V, 1mA < I
OUT
< 150mA
V
IN
= 4.3V, I
OUT
= 1mA, T
J
= 25ºC
4.8V < V
IN
< 20V, 1mA < I
OUT
< 150mA
l
l
l
l
l
l
l
l
l
l
TYP
3.3
3.3
5
5
3.75
3.75
1.5
1.5
1.5
–12
–20
–17
–28
–12
–18
0.13
0.3
MAX
3.35
3.4
5.075
5.15
3.805
3.86
10
10
10
–25
–40
–35
–50
–25
–40
0.16
0.25
0.35
0.5
0.45
0.6
0.55
0.7
UNITS
V
V
V
V
V
V
mV
mV
mV
mV
mV
mV
mV
mV
mV
V
V
V
V
V
V
V
V
1121fg
3.25
3.2
4.925
4.85
3.695
3.64
LT1121-3.3
ΔV
IN
= 4.8V TO 20V, I
OUT
= 1mA
LT1121-5
ΔV
IN
= 5.5V TO 20V, I
OUT
= 1mA
LT1121 (Note 5)
ΔV
IN
= 4.3V TO 20V, I
OUT
= 1mA
ΔI
LOAD
= 1mA to 150mA, T
J
= 25ºC
ΔI
LOAD
= 1mA to 150mA
LT1121-5
ΔI
LOAD
= 1mA to 150mA, T
J
= 25ºC
ΔI
LOAD
= 1mA to 150mA
LT1121 (Note 5)
ΔI
LOAD
= 1mA to 150mA, T
J
= 25ºC
ΔI
LOAD
= 1mA to 150mA
LT1121-3.3
I
LOAD
= 1mA, T
J
= 25ºC
I
LOAD
= 1mA
I
LOAD
= 50mA, T
J
= 25ºC
I
LOAD
= 50mA
I
LOAD
= 100mA, T
J
= 25ºC
I
LOAD
= 100mA
I
LOAD
= 150mA, T
J
= 25ºC
I
LOAD
= 150mA
Load Regulation
Dropout Voltage (Note 6)
l
0.37
l
0.42
l
3
LT1121/LT1121-3.3/LT1121-5
ELECTRICAL CHARACTERISTICS
PARAMETER
Ground Pin Current (Note 7)
CONDITIONS
I
LOAD
= 0mA
I
LOAD
= 1mA
I
LOAD
= 10mA
I
LOAD
= 50mA
I
LOAD
= 100mA
I
LOAD
= 150mA
T
J
= 25ºC
V
OUT
= Off to On
V
OUT
= On to Off
V
SHDN
= 0V
V
IN
– V
OUT
= 1V (Avg), V
RIPPLE
= 0.5V
P-P
, f
RIPPLE
= 120Hz,
I
LOAD
= 0.1A
V
IN
– V
OUT
= 7V, T
J
= 25ºC
V
IN
= –20V, V
OUT
= 0V
LT1121-3.3
V
OUT
= 3.3V, V
IN
= 0V
LT1121-5
V
OUT
= 5V, V
IN
= 0V
LT1121 (Note 5) V
OUT
= 3.8V, V
IN
= 0V
l
l
l
l
l
l
l
l
l
l
l
The
l
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C.
MIN
TYP
30
90
350
1.5
4
7
150
0.25
1.2
0.75
6
16
50
58
200
16
16
16
500
1
25
25
25
MAX
50
120
500
2.5
7
14
300
2.8
10
22
UNITS
µA
µA
µA
mA
mA
mA
nA
V
V
µA
µA
dB
mA
mA
µA
µA
µA
Adjust Pin Bias Current (Notes 5, 8)
Shutdown Threshold
Shutdown Pin Current (Note 9)
Ripple Rejection
Current Limit
Input Reverse Leakage Current
Reverse Output Current (Note 11)
Quiescent Current in Shutdown (Note 10) V
IN
= 6V, V
SHDN
= 0V
Note 1:
Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2:
The shutdown pin input voltage rating is required for a low
impedance source. Internal protection devices connected to the shutdown
pin will turn on and clamp the pin to approximately 7V or – 0.6V. This
range allows the use of 5V logic devices to drive the pin directly. For high
impedance sources or logic running on supply voltages greater than 5.5V,
the maximum current driven into the shutdown pin must be limited to less
than 20mA.
Note 3:
For junction temperatures greater than 110°C, a minimum load
of 1mA is recommended. For T
J
> 110°C and I
OUT
< 1mA, output voltage
may increase by 1%.
Note 4:
Operating conditions are limited by maximum junction
temperature. The regulated output voltage specification will not apply
for all possible combinations of input voltage and output current. When
operating at maximum input voltage, the output current range must be
limited. When operating at maximum output current the input voltage
range must be limited.
Note 5:
The LT1121 (adjustable version) is tested and specified with the
adjust pin connected to the output pin.
Note 6:
Dropout voltage is the minimum input/output voltage required to
maintain regulation at the specified output current. In dropout the output
voltage will be equal to: (V
IN
– V
DROPOUT
).
Note 7:
Ground pin current is tested with V
IN
= V
OUT
(nominal) and a
current source load. This means that the device is tested while operating in
its dropout region. This is the worst case ground pin current. The ground
pin current will decrease slightly at higher input voltages.
Note 8:
Adjust pin bias current flows into the adjust pin.
Note 9:
Shutdown pin current at V
SHDN
= 0V flows out of the shutdown pin.
Note 10:
Quiescent current in shutdown is equal to the sum total of the
shutdown pin current (6µA) and the ground pin current (9µA).
Note 11:
Reverse output current is tested with the input pin grounded and
the output pin forced to the rated output voltage. This current flows into
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