4
LT1764 Series
1764fb
GND Pin Current I
LOAD
= 0mA ● 1 1.5 mA
V
IN
= V
OUT(NOMINAL)
+ 1V I
LOAD
= 1mA ● 1.1 1.6 mA
(Notes 5, 7) I
LOAD
= 100mA ● 3.5 5 mA
I
LOAD
= 500mA ● 11 18 mA
I
LOAD
= 1.5A ● 40 75 mA
I
LOAD
= 2.7A, 110°C < T
J
≤ 125°C 120 200 mA
I
LOAD
= 3A, –40°C ≤ T
J
≤ 110°C 120 200 mA
Output Voltage Noise C
OUT
= 10µF, I
LOAD
= 3A, BW = 10Hz to 100kHz 40 µV
RMS
ADJ Pin Bias Current (Notes 3, 8) 310µA
Shutdown Threshold V
OUT
= Off to On ● 0.9 2 V
V
OUT
= On to Off ● 0.25 0.75 V
SHDN Pin Current V
SHDN
= 0V 0.01 1 µA
(Note 9) V
SHDN
= 20V 7 30 µA
Quiescent Current in Shutdown V
IN
= 6V, V
SHDN
= 0V 0.01 1 µA
Ripple Rejection V
IN
– V
OUT
= 1.5V (Avg), V
RIPPLE
= 0.5V
P-P
,5563dB
f
RIPPLE
= 120Hz, I
LOAD
= 1.5A
Current Limit V
IN
= 7V, V
OUT
= 0V 4 A
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 3.1 A
V
IN
= V
OUT(NOMINAL)
+ 1V, ∆V
OUT
= – 0.1V, 110°C < T
J
≤ 125°C 2.8 A
LT1764, LT1764-1.5
V
IN
= 2.7V, ∆V
OUT
= – 0.1V, –40°C ≤ T
J
≤ 110°C 3.1 A
V
IN
= 2.7V, ∆V
OUT
= – 0.1V, 110°C < T
J
≤ 125°C 2.8 A
Input Reverse Leakage Current V
IN
= –20V, V
OUT
= 0V ● 1mA
Reverse Output Current (Note 10) LT1764-1.5 V
OUT
= 1.5V, V
IN
< 1.5V 600 1200 µA
LT1764-1.8 V
OUT
= 1.8V, V
IN
< 1.8V 600 1200 µA
LT1764-2.5 V
OUT
= 2.5V, V
IN
< 2.5V 600 1200 µA
LT1764-3.3 V
OUT
= 3.3V, V
IN
< 3.3V 600 1200 µA
LT1764 (Note 3) V
OUT
= 1.21V, V
IN
< 1.21V 300 600 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 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 300µA 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.
ELECTRICAL CHARACTERISTICS
PARAMETER CONDITIONS MIN TYP MAX UNITS
The ● denotes specifications which apply over the full operating temperature range, otherwise specifications are T
A
= 25°C. (Note 2)
