LT1121AIS8 Linear Technology, LT1121AIS8 Datasheet - Page 4

• Manufacturer Part Number: LT1121AIS8
• Description: IC REG LDO ADJ 150MA 8-SOIC
• Manufacturer: Linear Technology

Specifications of LT1121AIS8

• Regulator Topology: Positive Adjustable
• Voltage - Output: 3.75 ~ 30 V
• Voltage - Input: 4.17 ~ 30 V
• Voltage - Dropout (typical): 0.42V @ 150mA
• Number Of Regulators: 1
• Current - Output: 150mA
• Operating Temperature: -40°C ~ 125°C
• Mounting Type: Surface Mount
• Package / Case: 8-SOIC (3.9mm Width)
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Current - Limit (min): -

LT1121/LT1121-3.3/LT1121-5
ELECTRICAL CHARACTERISTICS
temperature range, otherwise specifi cations are at T
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
may increase by 1%.
Note 4: Operating conditions are limited by maximum junction
temperature. The regulated output voltage specifi cation 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
TYPICAL PERFORMANCE CHARACTERISTICS
4
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
0
Guaranteed Dropout Voltage
= TEST POINTS
20
T
J
40
OUTPUT CURRENT (mA)
≤ 125°C
60
T
J
80
≤ 25°C
J
100
> 110°C and I
120
140 160
1121 G01
OUT
< 1mA, output voltage
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
–50
A
Dropout Voltage
= 25°C.
–25
The
I
LOAD
0
TEMPERATURE (°C)
l
= 100mA
denotes the specifi cations which apply over the full operating
25
limited. When operating at maximum output current the input voltage
range must be limited.
Note 5: The LT1121 (adjustable version) is tested and specifi ed 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 specifi ed output current. In dropout the output
voltage will be equal to: (V
Note 7: Ground pin current is tested with V
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 fl ows into the adjust pin.
Note 9: Shutdown pin current at V
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 fl ows into
the output pin and out of the ground pin.
50
I
LOAD
I
LOAD
75
I
LOAD
= 150mA
= 50mA
= 1mA
100
1121 G02
125
IN
– V
50
40
30
20
10
0
DROPOUT
–50
Quiescent Current
SHDN
V
R
IN
LOAD
–25
= 6V
= 0V fl ows out of the shutdown pin.
).
=
∞
IN
0
TEMPERATURE (°C)
= V
V
V
SHDN
OUT
SHDN
25
(nominal) and a
= OPEN
= 0V
50
75
100
1121 G03
1121ff
125