LT1964

3

1964f

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

Dropout Voltage

0.1

0.15

V

q

0.19

V

(Notes 4, 5)

0.15

0.20

V

q

0.25

V

0.26

0.33

V

q

0.39

V

0.34

0.42

V

q

0.49

V

GND Pin Current

q

30

70

µA

q

85

180

µA

(Notes 4, 6)

q

300

600

µA

q

1.3

3

mA

q

2.5

6

mA

Output Voltage Noise

30

ADJ Pin Bias Current

(Notes 2, 7)

30

100

nA

Minimum Input Voltage (Note 12)

LT1964-BYP

q

–1.9

–2.8

V

LT1964-SD

q

–1.6

–2.2

V

Shutdown Threshold

q

1.6

2.1

V

q

–1.9

–2.8

V

q

0.25

0.8

V

q

–0.25

–0.8

V

SHDN Pin Current (Note 8)

–1

±0.1

1

µA

6

15

µA

–3

–9

µA

Quiescent Current in Shutdown

q

310

µA

Ripple Rejection

54

dB

Current Limit

350

mA

q

220

mA

Input Reverse Leakage Current

q

1mA

Note 1: Absolute Maximum Ratings are those values beyond which the life

of a device may be impaired.

Note 2: The LT1964 (adjustable version) is tested and specified for these

conditions with the ADJ pin connected to the OUT pin.

Note 3: 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 4: To satisfy requirements for minimum input voltage, the LT1964

(adjustable version) is tested and specified for these conditions with an

external resistor divider (two 249k resistors) for an output voltage of

–2.44V. The external resistor divider will add a 5

µA DC load on the output.

Note 5: Dropout voltage is the minimum input to output voltage differential

needed to maintain regulation at a specified output current. In dropout, the

source load. This means the device is tested while operating in its dropout

region. This is the worst-case GND pin current. The GND pin current will

decrease slightly at higher input voltages.

Note 7: ADJ pin bias current flows out of the ADJ pin.

Note 8: Positive SHDN pin current flows into the SHDN pin. SHDN pin

current is included in the GND pin current specification.

Note 9: For input-to-output differential voltages greater than 7V, a 50

µA

load is needed to maintain regulation.

Note 10: The LT1964E is guaranteed to meet performance specifications

from 0

°C to 125°C. Specifications over the –40°C to 125°C operating

junction temperature range are assured by design, characterization and

correlation with statistical process controls.

Note 11: A parasitic diode exists internally on the LT1964 between the

OUT, ADJ and SHDN pins and the IN pin. The OUT, ADJ and SHDN pins

cannot be pulled more than 0.5V more negative than the IN pin during

fault conditions, and must remain at a voltage more positive than the IN

pin during operation.

Note 12: For the LT1964-BYP, this specification accounts for the operating

threshold of the SHDN pin, which is tied to the IN pin internally. For the

LT1964-SD, the SHDN threshold must be met to ensure device operation.

Note 13: Actual thermal resistance (

function of board layout. Junction-to-case thermal resistance (

measured at Pin 2 is 60

°C/W. See the Thermal Considerations section in

the Applications Information.