LT1627 Просмотр технического описания (PDF) - Linear Technology
Номер в каталоге
Компоненты Описание
производитель
LT1627 Datasheet PDF : 16 Pages
| |||
LT1121/LT1121-3.3/LT1121-5
ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C.
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
Ground Pin Current (Note 7)
ILOAD = 0mA
ILOAD = 1mA
ILOAD = 10mA
ILOAD = 50mA
ILOAD = 100mA
ILOAD = 150mA
l
30
50
µA
l
90
120
µA
l
350
500
µA
l
1.5
2.5
mA
l
4
7
mA
l
7
14
mA
Adjust Pin Bias Current (Notes 5, 8)
TJ = 25ºC
150
300
nA
Shutdown Threshold
VOUT = Off to On
VOUT = On to Off
l
1.2
2.8
V
l 0.25 0.75
V
Shutdown Pin Current (Note 9)
VSHDN = 0V
l
6
10
µA
Quiescent Current in Shutdown (Note 10) VIN = 6V, VSHDN = 0V
l
16
22
µA
Ripple Rejection
VIN – VOUT = 1V (Avg), VRIPPLE = 0.5VP-P , fRIPPLE = 120Hz,
50
58
dB
ILOAD = 0.1A
Current Limit
VIN – VOUT = 7V, TJ = 25ºC
200
500
mA
Input Reverse Leakage Current
VIN = –20V, VOUT = 0V
l
1
mA
Reverse Output Current (Note 11)
LT1121-3.3
VOUT = 3.3V, VIN = 0V
LT1121-5
VOUT = 5V, VIN = 0V
LT1121 (Note 5) VOUT = 3.8V, VIN = 0V
16
25
µA
16
25
µA
16
25
µA
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 TJ > 110°C and IOUT < 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: (VIN – VDROPOUT).
Note 7: 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 8: Adjust pin bias current flows into the adjust pin.
Note 9: Shutdown pin current at VSHDN = 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
the output pin and out of the ground pin.
1121fg
4
Share Link: 