3

LT1961

1961fa

ELECTRICAL CHARACTERISTICS

PARAMETER

CONDITION

MIN

TYP

MAX

UNITS

FB Input Current

●

0

– 0.2

– 0.4

μA

150

350

●

500

850

1300

μMho

●

– 85

– 120

– 165

μA

●

70

110

165

μA

2.4

A/V

Duty Cycle = 0%

0.3

V

0.9

V

Maximum Switch Duty Cycle

●

80

90

%

80

%

75

%

SHDN Threshold Voltage

●

1.28

1.35

1.42

V

SHDN Input Current (Shutting Down)

SHDN = 60mV Above Threshold

●

–7

–10

–13

μA

SHDN Threshold Current Hysteresis

SHDN = 100mV Below Threshold

4

7

10

μA

SYNC Threshold Voltage

1.5

2.2

V

SYNC Input Frequency

1.5

2

MHz

SYNC Pin Resistance

20

k

Ω

The

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 LT1961E is guaranteed to meet performance specifications

from 0

°C to 125°C junction temperature. Specifications over the –40°C to

125

°C operating junction temperature range are assured by design,

characterization and correlation with statistical process controls. The

LT1961I is guaranteed over the – 40ºC to 125ºC operating junction

temperature range.

Note 3: Minimum input voltage is defined as the voltage where the

internal regulator enters lockout. Actual minimum input voltage to

maintain a regulated output will depend on output voltage and load

current. See Applications Information.