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参数资料
| 型号： | LT1764A |
| 厂商： | Linear Technology Corporation |
| 英文描述： | 500mA, Low Voltage, Very Low Dropout Linear Regulator |
| 中文描述： | 500mA的，低电压，非常低压差线性稳压器 |
| 文件页数： | 4/16页 |
| 文件大小： | 213K |
| 代理商： | LT1764A |
4
LT1764 Series
Note 1:
Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2:
The LT1764 regulators are tested and specified under pulse load
conditions such that T
J
≈
T
A
. The LT1764 is 100% tested at T
A
= 25
°
C.
Performance at –40
°
C and 125
°
C is assured by design, characterization
and correlation with statistical process controls.
Note 3:
The LT1764 (adjustable version) is tested and specified for these
conditions with the ADJ pin connected to the OUT pin.
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:
To satisfy requirements for minimum input voltage, the LT1764
(adjustable version) is tested and specified for these conditions with an
external resistor divider (two 4.12k resistors) for an output voltage of
2.42V. The external resistor divider will add a 300
μ
A DC load on the output.
Note 6:
Dropout voltage is the minimum input to output voltage differential
needed to maintain regulation at a specified output current. In dropout, the
output voltage will be equal to: V
IN
– V
DROPOUT
.
Note 7:
GND pin current is tested with V
IN
= V
OUT(NOMINAL)
+ 1V or
V
IN
= 2.7V (whichever is greater) and a current source load. The GND pin
current will decrease at higher input voltages.
Note 8:
ADJ pin bias current flows into the ADJ pin.
Note 9:
SHDN pin current flows into the SHDN pin.
Note 10:
Reverse output current is tested with the IN pin grounded and the
OUT pin forced to the rated output voltage. This current flows into the OUT
pin and out the GND pin.
Note 11.
For the LT1764, LT1764-1.5 and LT1764-1.8 dropout voltage will
be limited by the minimum input voltage specification under some output
voltage/load conditions.
Note 12.
All combinations of absolute maximum input voltage and
absolute maximum output voltage cannot be achieved. The absolute
maximum differential from input to output is
±
20V. For example, with
V
IN
= 20V, V
OUT
cannot be pulled below ground.
Current Limit
V
IN
= 7V, V
OUT
= 0V
LT1764-1.8, LT1764-2.5, LT1764-3.3
V
IN
= V
OUT(NOMINAL)
+ 1V,
V
OUT
= –0.1V, –40
°
C
≤
T
J
≤
110
°
C
V
IN
= V
OUT(NOMINAL)
+ 1V,
V
OUT
= –0.1V, 110
°
C < T
J
≤
125
°
C
LT1764, LT1764-1.5
V
IN
= 2.7V,
V
OUT
= –0.1V, –40
°
C
≤
T
J
≤
110
°
C
V
IN
= 2.7V,
V
OUT
= –0.1V, 110
°
C < T
J
≤
125
°
C
V
IN
= –20V, V
OUT
= 0V
4
A
3.1
2.8
A
A
3.1
2.8
A
A
Input Reverse Leakage Current
Reverse Output Current (Note 10) LT1764-1.5 V
OUT
= 1.5V, V
IN
< 1.5V
LT1764-1.8 V
OUT
= 1.8V, V
IN
< 1.8V
LT1764-2.5 V
OUT
= 2.5V, V
IN
< 2.5V
LT1764-3.3 V
OUT
= 3.3V, V
IN
< 3.3V
LT1764 (Note 3) V
OUT
= 1.21V, V
IN
< 1.21V
G
1
mA
μ
A
μ
A
μ
A
μ
A
μ
A
600
600
600
600
300
1200
1200
1200
1200
600
ELECTRICAL CHARACTERISTICS
The
G
denotes specifications which apply over the full operating temperature range, otherwise specifications are T
A
= 25
°
C. (Note 2)
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
TYPICAL PERFOR U
Typical Dropout Voltage
OUTPUT CURRENT (A)
0
0
D
100
200
300
400
600
0.5
1.0
1.5
2.0
1764 G01
2.5
3.0
500
T
J
= 125
°
C
T
J
= 25
°
C
Guaranteed Dropout Voltage
OUTPUT CURRENT (A)
0
700
600
500
400
300
200
100
0
1.5
2.5
1764 G02
0.5
1.0
2.0
3.0
G
= TEST POINTS
T
J
≤
125
°
C
T
J
≤
25
°
C
TEMPERATURE (
°
C)
–50
D
400
500
600
25
75
1764 G03
300
200
–25
0
50
100
125
100
0
I
L
= 3A
I
L
= 1.5A
I
L
= 0.5A
I
L
= 100mA
I
L
= 1mA
Dropout Voltage
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