LT1121ACS8(RevA) Просмотр технического описания (PDF) - Linear Technology
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LT1121ACS8 Datasheet PDF : 12 Pages
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LT1121/LT1121-3.3/LT1121-5
ELECTRICAL CHARACTERISTICS
PARAMETER
CONDITIONS
Load Regulation
LT1121-3.3
LT1121-5
∆ILOAD = 1mA to 150mA, TJ = 25°C
∆ILOAD = 1mA to 150mA
q
∆ILOAD = 1mA to 150mA, TJ = 25°C
∆ILOAD = 1mA to 150mA
q
Dropout Voltage
(Note 5)
LT1121 (Note 4) ∆ILOAD = 1mA to 150mA, TJ = 25°C
∆ILOAD = 1mA to 150mA
q
ILOAD = 1mA, TJ = 25°C
ILOAD = 1mA
q
ILOAD = 50mA, TJ = 25°C
LOAD = 50mA
q
ILOAD = 100mA, TJ = 25°C
ILOAD = 100mA
q
ILOAD = 150mA, TJ = 25°C
ILOAD = 150mA
q
Ground Pin Current
ILOAD = 0mA
q
(Note 6)
ILOAD = 1mA
q
ILOAD = 10mA
q
ILOAD = 50mA
q
ILOAD = 100mA
q
ILOAD = 150mA
q
Adjust Pin Bias Current (Notes 4, 7)
TJ = 25°C
Shutdown Threshold
VOUT = Off to On
q
VOUT = On to Off
q
Shutdown Pin Current (Note 8)
VSHDN = 0V
q
Quiescent Current in Shutdown (Note 9) VIN = 6V, VSHDN = 0V
q
Ripple Rejection
VIN – VOUT = 1V (Avg), VRIPPLE = 0.5VP-P,
fRIPPLE = 120Hz, ILOAD = 0.1A
Current Limit
VIN – VOUT = 7V, TJ = 25°C
Input Reverse Leakage Current
VIN = –20V, VOUT = 0V
q
Reverse Output Current (Note 10)
LT1121-3.3
LT1121-5
LT1121 (Note 4)
VOUT = 3.3V, VIN = 0V
VOUT = 5V, VIN = 0V
VOUT = 3.8V, VIN = 0V
MIN TYP MAX
– 12 – 20
– 20 – 30
– 17 – 30
– 28 – 45
– 12 – 20
– 18 – 30
0.13 0.16
0.25
0.30 0.35
0.50
0.37 0.45
0.60
0.42 0.55
0.70
30
50
90
120
350 500
1.5
2.5
4.0
7.0
7.0
14.0
150
300
1.2
2.8
0.25 0.75
6
10
15
22
50
58
200 500
1.0
16
25
16
25
16
25
UNITS
mV
mV
mV
mV
mV
mV
V
V
V
V
V
V
V
V
µA
µA
µA
mA
mA
mA
nA
V
V
µA
µA
dB
mA
mA
µA
µA
µA
The q denotes specifications which apply over the operating temperature
range.
Note 1: 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 2: For junction temperatures greater than 110°C, a minimum load of
1mA is recommended. For TJ > 110°C and IOUT < 1mA, output voltage
may increase by 1%.
Note 3: 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 4: The LT1121 (adjustable version) is tested and specified with the
adjust pin connected to the output pin.
Note 5: 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: (VIN – VDROPOUT).
Note 6: Ground pin current is tested with VIN = VOUT (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 7: Adjust pin bias current flows into the adjust pin.
Note 8: Shutdown pin current at VSHDN = 0V flows out of the shutdown pin.
Note 9: Quiescent current in shutdown is equal to the sum total of the
shutdown pin current (6µA) and the ground pin current (9µA).
Note 10: Reverse output current is tested with the input pin grounded and
the output pin forced to the rated output voltage. This current flows into
the output pin and out of the ground pin.
3
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