LT1765/LT1765-1.8/LT1765-2.5/

LT1765-3.3/LT1765-5

3

sn1765 1765fas

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

of a device may be impaired.

Note 2: The LT1765E 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.

FB Input Current

LT1765 (Adj)

q

– 0.25

– 0.5

µA

FB Input Resistance

LT1765

q

10.5

15

21

k

Ω

LT1765-1.8

q

14.7

21

30

k

Ω

LT1765-3.3

q

19

27.5

39

k

Ω

LT1765-5

q

29

42

60

k

Ω

FB Error Amp Voltage Gain

150

350

FB Error Amp Transconductance

q

500

850

1300

µMho

q

80

120

160

µA

q

70

110

180

µA

5

A/V

Duty Cycle = 0%

0.4

V

0.9

V

Maximum Switch Duty Cycle

85

90

%

q

80

%

Minimum Boost Voltage Above Switch

q

1.8

2.7

V

Boost Current

q

20

30

mA

q

70

140

mA

SHDN Threshold Voltage

q

1.27

1.33

1.40

V

SHDN Threshold Current Hysteresis

q

47

10

µA

SHDN Input Current (Shutting Down)

SHDN = 60mV Above Threshold

q

–7

– 10

– 13

µA

SYNC Threshold Voltage

1.5

2.2

V

SYNC Input Frequency

1.6

2

MHz

SYNC Pin Resistance

20

k

Ω

ELECTRICAL CHARACTERISTICS

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.

Note 4: Current flows into the BOOST pin only during the on period of the

switch cycle.

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS