LTC2938/LTC2939

4

293839ff

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

WDI Input Current

l

l

l

l

–10

10

–30

30

μA

μA

μA

μA

WDI Input Pulse Width

l

2μs

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: All currents into pins are positive, all voltages are referenced to

GND unless otherwise noted.

Note 4: Under static no-fault conditions, V1 will necessarily supply

quiescent current. If at any time V2 is larger than V1, V2 must be capable

of supplying the quiescent current, programming (transient) current and

reference load current.

Note 5: The outputs RST and WDO have internal pull-ups to V2 of typically

6μA. However, external pull-up resistors may be used when faster rise

to monitor 1.2V, 1.5V, 1.8V and 2.5V supplies, external pull-up resistors

threshold of the external circuit.

TYPICAL PERFORMANCE CHARACTERISTICS

Normalized Threshold Voltages

vs Temperature

–ADJ Threshold Voltage

vs Temperature

TEMPERATURE (°C)

–50

1.005

1.010

1.015

25

75

29389 G01

1.000

0.995

–25

0

50

100

125

0.990

0.985

TEMPERATURE (°C)

–50

6

12

18

25

75

29389 G02

0

–6

–25

0

50

100

125

–12

–18

TEMPERATURE (°C)

–50

1.216

1.222

1.228

25

75

29389 G03

1.210

1.204

–25

0

50

100

125

1.198

1.192