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LT1764 Series

1764fa

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 TJ ≈ TA. The LT1764 is 100% 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: 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

µA 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: VIN – VDROPOUT.

Note 7: GND pin current is tested with VIN = VOUT(NOMINAL) + 1V or

VIN = 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

VIN = 20V, VOUT cannot be pulled below ground.

Current Limit

VIN = 7V, VOUT = 0V

LT1764-1.8, LT1764-2.5, LT1764-3.3

VIN = VOUT(NOMINAL) + 1V, ∆VOUT = – 0.1V, – 40°C ≤ TJ ≤ 110°C

3.1

VIN = VOUT(NOMINAL) + 1V, ∆VOUT = – 0.1V, 110°C < TJ ≤ 125°C

2.8

LT1764, LT1764-1.5

VIN = 2.7V, ∆VOUT = – 0.1V, – 40°C ≤ TJ ≤ 110°C

3.1

VIN = 2.7V, ∆VOUT = – 0.1V, 110°C < TJ ≤ 125°C

2.8

Input Reverse Leakage Current

VIN = – 20V, VOUT = 0V

1mA

Reverse Output Current (Note 10) LT1764-1.5 VOUT = 1.5V, VIN < 1.5V

600

1200

µA

LT1764-1.8 VOUT = 1.8V, VIN < 1.8V

600

1200

µA

LT1764-2.5 VOUT = 2.5V, VIN < 2.5V

600

1200

µA

LT1764-3.3 VOUT = 3.3V, VIN < 3.3V

600

1200

µA

LT1764 (Note 3) VOUT = 1.21V, VIN < 1.21V

300

600

µA

ELECTRICAL CHARACTERISTICS

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

The q denotes specifications which apply over the full operating temperature range, otherwise specifications are TA = 25°C. (Note 2)

TYPICAL PERFOR A CE CHARACTERISTICS

Typical Dropout Voltage

OUTPUT CURRENT (A)

100

200

300

400

600

0.5

1.0

1.5

2.0

1764 G01

2.5

3.0

500

TJ = 125°C

TJ = 25°C

Guaranteed Dropout Voltage

OUTPUT CURRENT (A)

700

600

500

400

300

200

100

1.5

2.5

1764 G02

0.5

1.0

2.0

3.0

= TEST POINTS

TJ ≤ 125°C

TJ ≤ 25°C

TEMPERATURE (

°C)

–50

400

500

600

1764 G03

300

200

–25

100

125

100

IL = 3A

IL = 1.5A

IL = 0.5A

IL = 100mA

IL = 1mA

Dropout Voltage

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