2

LT1268B/LT1268

A

G

A

U

A

R

BSOLUTEXI

TI

S

Supply Voltage ....................................................... 30V

Switch Output Voltage ............................................ 60V

Feedback Pin Voltage (Transient, 1ms) ................

±15V

Operating Junction Temperature Range

Operating ............................................... 0

°C to 125°C

Short-Circuit ......................................... 0

°C to 140°C

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

°C to 150°C

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

°C

ORDER PART

NUMBER

PACKAGE/ORDER I FOR ATIO

ORDER PART

NUMBER

LT1268CT

LT1268BCT

Q PACKAGE

5-LEAD DD

FRONT VIEW

GND

FB

5

4

3

2

1

LT1268CQ

LT1268BCQ

T PACKAGE

5-LEAD TO-220

GND

FB

FRONT VIEW

5

4

3

2

1

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

Reference Voltage Measured at

LT1268B

1.235

1.244

1.253

V

Feedback Pin (Note 4)

q

1.224

1.244

1.264

V

Reference Voltage

LT1268

1.224

1.244

1.264

V

q

1.214

1.244

1.274

V

Feedback Input Current

350

750

nA

q

1100

nA

Error Amplifier Transconductance

3000

4400

6000

µmho

q

2400

7000

µmho

Error Amplifier Source or Sink Current

150

200

350

µA

q

120

400

µA

Error Amplifier Clamp Voltage

1.80

2.30

V

0.25

0.38

0.52

V

Reference Voltage Line Regulation

3V

q

0.03

%/V

Error Amplifier Voltage Gain

0.9V

500

800

V/V

Minimum Input Voltage

q

2.8

3.0

V

Supply Current

3V

7

10

mA

Control Pin Threshold

Duty Cycle = 0

0.7

0.9

1.08

V

q

0.5

1.25

V

BV

Output Switch Breakdown Voltage

3V

q

60

75

V

Output Switch-ON Resistance

0.12

0.18

Ω

(Note 1, 3)

0.22

Ω

Control Voltage to Switch

12

A/V

Current Transconductance

Switch Current Limit (Note 3, 6)

q

7.50

15

A

q

6.50

14

A

ELECTRICAL C

C

HARA TERISTICS

Consult factory for Industrial and Military parts