3021 データシートの表示（PDF） - Linear Technology
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3021 Datasheet PDF : 16 Pages
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LT3021/LT3021-1.2/
LT3021-1.5/LT3021-1.8
ELECTRICAL CHARACTERISTICS
The ● denotes specifications which apply over the full operating temperature range, otherwise specifications are TJ = 25°C.
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
Current Limit (Note 12)
Input Reverse Leakage Current
Reverse Output Current
(Notes 11, 13)
VIN = 10V, VOUT = 0V
VIN = VOUT(NOMINAL) + 0.5V, ∆VOUT = –5%
VIN = –10V, VOUT = 0V
LT3021
LT3021-1.2
LT3021-1.5
LT3021-1.8
VOUT = 1.2V, VIN = 0V
VOUT = 1.2V, VIN = 0V
VOUT = 1.5V, VIN = 0V
VOUT = 1.8V, VIN = 0V
1.8
A
● 550
mA
1
20
µA
0.5
5
µA
10
15
µA
10
15
µA
10
15
µA
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2: The LT3021 regulators are tested and specified under pulse load
conditions such that TJ ≈ TA. The LT3021 is 100% production tested at
TA = 25°C. Performance at –40°C and 125°C is assured by design,
characterization and correlation with statistical process controls.
Note 3: This IC includes overtemperature protection that is intended to
protect the device during momentary overload conditions. Junction
temperature will exceed 125°C when overtemperature protection is active.
Continuous operation above the specified maximum operating junction
temperature may impair device reliability.
Note 4: Maximum junction temperature limits operating conditions. The
regulated output voltage specification does not apply for all possible
combinations of input voltage and output current. Limit the output current
range if operating at maximum input voltage. Limit the input voltage range
if operating at maximum output current.
Note 5: Typically the LT3021 supplies 500mA output current with a 1V
input supply. The guranteed minimum input voltage for 500mA output
current is 1.10V.
Note 6: The LT3021 is tested and specified for these conditions with an
external resistor divider (20k and 30.1k) setting VOUT to 0.5V. The external
resistor divider adds 10µA of output load current. The line regulation and
load regulation specifications refer to the change in the 0.2V reference
voltage, not the 0.5V output voltage. Specifications for fixed output voltage
devices are referred to the output voltage.
Note 7: Dropout voltage is the minimum input to output voltage differential
needed to maintain regulation at a specified output current. In dropout the
output voltage equals: (VIN – VDROPOUT).
Note 8: GND pin current is tested with VIN = VOUT(NOMINAL) + 0.4V and a
current source load. GND pin current will increase in dropout. See GND
pin current curves in the Typical Performance Characteristics section.
Note 9: Adjust pin bias current flows out of the ADJ pin.
Note 10: Shutdown pin current flows into the SHDN pin.
Note 11: Reverse output current is tested with IN grounded and OUT
forced to the rated output voltage. This current flows into the OUT pin and
out of the GND pin. For fixed voltage devices this includes the current in
the output resistor divider.
Note 12: The LT3021 is tested and specified for these conditions with an
external resistor divider (20k and 100k) setting VOUT to 1.2V. The external
resistor divider adds 10µA of load current.
Note 13: Reverse current is higher for the case of (rated_output) < VOUT <
VIN, because the no-load recovery circuitry is active in this region and is
trying to restore the output voltage to its nominal value.
Note 14: Minimum input voltage is the minimum voltage required by the
control circuit to regulate the output voltage and supply the full 500mA
rated current. This specification is tested at VOUT = 0.5V. At higher output
voltages the minimum input voltage required for regulation will be equal to
the regulated output voltage VOUT plus the dropout voltage.
TYPICAL PERFOR A CE CHARACTERISTICS
Dropout Voltage
250
225
TJ = 125°C
200
175
150
125
TJ = 25°C
100
75
50
25
0
0
100 200 300 400 500
OUTPUT CURRENT (mA)
3021 G01
Dropout Voltage
250 VOUT = 1.2V
225
IL = 500mA
200
175
IL = 250mA
150
125
IL = 100mA
100
75
IL = 50mA
50
IL = 10mA
25
0
–50 –25
IL = 1mA
0 25 50 75
TEMPERATURE (°C)
100 125
3021 G02
4
Minimum Input Voltage
1.2 IL = 500mA
1.1
1.0
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
3021 G16
3021fa
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