LT1239 Просмотр технического описания (PDF) - Linear Technology
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LT1239 Datasheet PDF : 12 Pages
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LT1239
ELECTRICAL CHARACTERISTICS
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
Offset Voltage
q
0
15
mV
Output Current Sourcing
Sinking
VIN2 = 6.8V, VE/A(IN) = 3.4V, TJ = 25°C
VIN2 = 6.8V, VE/A(IN) = 3.4V, TJ = 25°C
Regulator 2, Low Battery Detector and Error Amplifier
3
5
mA
3
5
mA
Quiescent Current
VIN2 = 6.8V, 5VIN = 0V, VE/A(IN) = 3.4V
q
VIN2 = 6.8V, 5VIN = 0V, VE/A(IN) = 3.4V, VPIN6 = 0V
q
VIN2 = 4.8V, 5VIN = 0V, VE/A(IN) = 2.4V
q
20
30
µA
8
12
µA
3
6
µA
The q denotes specifications which apply over the full operating
temperature range.
Note 1: All voltages are with respect to the ground pins of the device
(pins 2, 4, 5) unless otherwise specified.
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
5mA.
Note 3: The current monitor pin for regulator 1 (pin 15) can be pulled 30V
below the input pin (pin 14). The current monitor pin must not be pulled
above the input pin.
Note 4: The current monitor pin for regulator 2 (pin 11) can be pulled 30V
below the input pin (pin 10). The current monitor pin must not be pulled
above the input pin.
Note 5: E/A (OUT) pin should not be pulled below ground or above
the voltage at Input 2.
Note 6: The device is specified to an operating temperature range of 0°C to
70°C. The device is guaranteed to be functional up to the thermal
shutdown temperature. The thermal shutdown temperature for this device
is approximately 100°C.
Note 7: Operating conditions are limited by maximum junction
temperature. The regulated output specification will not apply for all
possible combinations of input voltage and output current. When
operating at maximum output current, the input voltage range must be
limited. When operating at maximum input voltage, the output current
range must be limited.
Note 8: Regulator 1 of the LT1239 is tested and specified with the adjust
pin (pin 1) tied to the output pin (pin 16). See Applications Information.
Note 9: Dropout voltage is the minimum input/output voltage required to
maintain regulation at the specified output current. In dropout, the output
voltage measured at the package pins will be equal to (VIN – VDROPOUT).
Note 10: The quiescent current of the comparator is included in the
ground pin current and quiescent current specifications for regulator 1.
The comparator output is turned off (pin 13 = 0V, pin 12 = 5V) during
these tests.
Note 11: Ground pin current for regulator 1 is tested with VIN = VOUT
(nominal) and a current source load. This means that the device is tested
in it’s dropout region. Ground pin current will decrease slightly at higher
input voltages.
Note 12: Adjust pin current flows into the adjust pin.
Note 13: Shutdown pin current at VSHDN = 0V flows out of
the shutdown pin.
Note 14: 6.8V is the nominal voltage of two lithium-ion cells.
TYPICAL PERFORMANCE CHARACTERISTICS
Low-Battery Detector Thresholds
vs Temperature
5.60
5.50
5.40
START-UP THRESHOLD
5.30
5.20
5.10
SHUTDOWN THRESHOLD
5.00
4.90
–50 –25
0 25 50
TEMPERATURE (°C)
75 100
LT1239 • TPC01
4
Regulator 2 Output Voltage vs
Temperature
4.975
4.950
4.925
4.900
4.875
4.850
4.825
4.800
4.775
4.750
4.725
–50 –25 0 25 50 75 100
TEMPERATURE (°C)
LT1239 • TPC02
Regulator 1 Adjust Pin Voltage vs
Temperature
3.80
3.79
3.78
3.77
3.76
3.75
3.74
3.73
3.72
3.71
3.70
–50 –25 0 25 50 75 100
TEMPERATURE (°C)
LT1239 • TPC03
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