LT1528CT-TR Ver la hoja de datos (PDF) - Linear Technology
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LT1528CT-TR Datasheet PDF : 12 Pages
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LT1528
ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TJ = 25°C.
PARAMETER
CONDITIONS
MIN
TYP MAX
Dropout Voltage (Note 5)
GND Pin Current (Note 6)
SENSE Pin Current (Notes 4, 8)
ILOAD = 100mA
ILOAD = 100mA
ILOAD = 700mA
ILOAD = 700mA
ILOAD = 1.5A
ILOAD = 1.5A
ILOAD = 3A
ILOAD = 3A
ILOAD = 0mA
ILOAD = 0mA, TJ = 125°C (Note 7)
ILOAD = 100mA
ILOAD = 100mA, TJ = 125°C (Note 7)
ILOAD = 300mA
ILOAD = 300mA, TJ = 125°C (Note 7)
ILOAD = 700mA
ILOAD = 700mA, TJ = 125°C (Note 7)
ILOAD = 1.5A
ILOAD = 3A
l
l
l
l
l
l
90
150
200
250
280
320
420
390
450
600
570
670
850
450
750
1.9
1.2
2.5
2.7
2.6
4.0
4.1
7.3
12.0
8.8
22
40
85
140
130
250
SHDN Threshold
SHDN Pin Current (Note 9)
VOUT = Off-to-On
VOUT = On-to-Off
VSHDN = 0V
l
1.20 2.80
l 0.25
0.75
l
37
100
Quiescent Current in Shutdown (Note 10)
VIN = 6V, VSHDN = 0V
l
110
220
Ripple Rejection
Current Limit
Input Reverse Leakage Current
VIN – VOUT = 1V(Avg), VRIPPLE = 0.5VP-P,
fRIPPLE = 120Hz, ILOAD = 1.5A
VIN – VOUT = 7V
VIN = 4.3V, ΔVOUT = – 0.1V
VIN = – 15V, VOUT = 0V
50
67
4.5
l 3.2
4.0
l
1.0
Reverse Output Current (Note 11)
VOUT = 3.3V, VIN = 0V
120
250
UNITS
mV
mV
mV
mV
mV
mV
mV
mV
μA
mA
mA
mA
mA
mA
mA
mA
mA
mA
μA
V
V
μA
μA
dB
A
A
mA
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 SHDN pin input voltage rating is required for a low
impedance source. Internal protection devices connected to the SHDN
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 SHDN pin must be less than
5mA.
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 must be limited.
When operating at maximum output current, the input voltage range
must be limited.
Note 4: The LT1528 is tested and specified with the SENSE 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: GND 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 GND pin current. The GND
pin current will decrease slightly at higher input voltages.
Note 7: GND pin current will rise at TJ > 75°C. This is due to internal
circuitry designed to compensate for leakage currents in the output
transistor at high temperatures. This allows quiescent current to be
minimized at lower temperatures, yet maintain output regulation at high
temperatures with light loads. See quiescent current curve in typical
performance characteristics section.
Note 8: SENSE pin current flows into the SENSE pin.
Note 9: SHDN pin current at VSHDN = 0V flows out of the SHDN pin.
Note 10: Quiescent current in shutdown is equal to the total sum of the
SHDN pin current (40μA) and the GND pin current (70μA).
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 GND pin.
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