LT1268_15 datasheet(2/4 Pages) LINER

2 / 4 page

LT1268B/LT1268

BSOLUTEXI

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

TJMAX = 125°C, θJC = 2°C/W, θJA = 50°C/W

LT1268CT

LT1268BCT

TJMAX = 125°C, θJC = 2°C/ W, θJA = See Notes 5 and 6

Q PACKAGE

5-LEAD DD

FRONT VIEW

VIN

VSW

GND

LT1268CQ

LT1268BCQ

T PACKAGE

5-LEAD TO-220

VIN

VSW

GND

FRONT VIEW

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

VREF

Reference Voltage Measured at

LT1268B

1.235

1.244

1.253

Feedback Pin (Note 4)

1.224

1.244

1.264

Reference Voltage

LT1268

1.224

1.244

1.264

1.214

1.244

1.274

Feedback Input Current

VFB = VREF

350

750

1100

Error Amplifier Transconductance

∆IC = ±25µA

3000

4400

6000

µmho

2400

7000

µmho

Error Amplifier Source or Sink Current

VC = 1.5V

150

200

350

µA

120

400

µA

Error Amplifier Clamp Voltage

Hi Clamp, VFB = 1V

1.80

2.30

Lo Clamp, VFB = 1.5V

0.25

0.38

0.52

Reference Voltage Line Regulation

≤ VIN ≤ VMAX, VC = 0.8V

0.03

%/V

Error Amplifier Voltage Gain

0.9V

≤ VC ≤ 1.4V

500

800

V/V

Minimum Input Voltage

2.8

3.0

Supply Current

≤ VIN ≤ VMAX, VC = 0.6V

Control Pin Threshold

Duty Cycle = 0

0.7

0.9

1.08

0.5

1.25

Output Switch Breakdown Voltage

≤ VIN ≤ VMAX, ISW = 1.5mA

VSAT

Output Switch-ON Resistance

TJ ≤ 100°C

0.12

0.18

Ω

(Note 1, 3)

TJ ≤ 125°C

0.22

Ω

Control Voltage to Switch

A/V

Current Transconductance

ILIM

Switch Current Limit (Note 3, 6)

Duty Cycle = 50%, TJ ≤ 100°C

7.50

Duty Cycle = 65%, TJ ≤ 100°C

6.50

VIN = 15V, VC = 0.5V, VFB = VREF, switch pin open, unless otherwise noted.

ELECTRICAL C

HARA TERISTICS

Consult factory for Industrial and Military parts

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