2

LT1776

(Note 1)

Supply Voltage (Note 5) .......................................... 60V

Switch Voltage (Note 5) ........................................... 60V

SHDN, SYNC Pin Voltage ........................................... 7V

FB Pin Voltage ........................................................... 3V

Operating Junction Temperature Range

LT1776C ................................................ 0

°C to 125°C

LT1776I ............................................ – 40

°C to 125°C

Storage Temperature Range ................. – 65

°C to 150°C

Lead Temperature (Soldering, 10 sec).................. 300

°C

ORDER PART

NUMBER

LT1776CN8

LT1776CS8

LT1776IN8

LT1776IS8

S8 PART MARKING

1776

1776I

Consult factory for Military grade parts.

ELECTRICAL CHARACTERISTICS

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

Power Supplies

Minimum Input Voltage

6.7

7.0

V

q

7.4

V

Thermally Limited Continuous Operating Voltage

q

40

V

620

800

µA

q

900

µA

3.2

4.0

mA

q

5.0

mA

(Note 2)

2.8

3.1

V

30

50

µA

q

75

µA

Feedback Amplifier

Reference Voltage

1.225

1.240

1.255

V

q

1.215

1.265

V

FB Pin Input Bias Current

600

1500

nA

Feedback Amplifier Transconductance

∆lc = ±10µA

400

650

1000

µmho

q

200

1500

µmho

Feedback Amplifier Source or Sink Current

60

100

170

µA

q

45

220

µA

Feedback Amplifier Clamp Voltage

2.0

V

Reference Voltage Line Regulation

12V

q

0.01

%/V

Voltage Gain

200

600

V/V

Output Switch

Output Switch On Voltage

1.0

1.5

V

Switch Current Limit

(Note 3)

q

0.55

0.70

1.0

A

Current Amplifier

Control Pin Threshold

Duty Cycle = 0%

0.9

1.1

1.25

V

Control Voltage to Switch Transconductance

2

A/V

1

2

3

4

8

7

6

5

TOP VIEW

FB

SYNC

SHDN

GND

N8 PACKAGE

8-LEAD PDIP

S8 PACKAGE

8-LEAD PLASTIC SO