LT1940_15 datasheet(2/20 Pages) LINER

2 / 20 page

LT1940/LT1940L

1940fa

VIN Voltage

LT1940 .................................................... (–0.3), 25V

LT1940L ................................................... (–0.3), 7V

BOOST Pin Voltage

LT1940 ................................................................ 35V

LT1940L ............................................................. 16V

BOOST Pin Above SW Pin

LT1940 ................................................................ 25V

LT1940L ............................................................. 16V

PG Pin Voltage

LT1940 ................................................................ 25V

LT1940L ............................................................... 7V

SW Voltage ................................................................VIN

RUN/SS, FB Pins ...................................................... 6V

Maximum Junction Temperature .......................... 125

°C

Operating Temperature Range (Note 2) ...–40

°C to 85°C

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

°C to 150°C

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

°C

ORDER PART

NUMBER

TJMAX = 125°C, θJA = 45°C/W, θJC = 10°C/W

LT1940EFE

LT1940LEFE

ABSOLUTE

AXI U

RATI GS

PACKAGE/ORDER I FOR ATIO

(Note 1)

ELECTRICAL CHARACTERISTICS The q denotes the specifications which apply over the full operating

temperature range, otherwise specifications are at TA = 25°C. VIN = 5V, VBOOST = 8V unless otherwise noted. (Note 2)

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

Minimum Operating Voltage

3.4

3.6

Quiescent Current

Not Switching

3.8

4.8

Shutdown Current

VRUNSS = 0V

µA

Feedback Voltage

1.230

1.250

1.270

°C to 70°C

1.225

1.250

1.270

–40

°C to 85°C

1.215

1.250

1.270

FB Pin Bias Current

VFB = 1.25V, VC = 0.4V

240

1200

Reference Line Regulation

LT1940: VIN 5V to 25V

0.005

%/V

LT1940L: VIN 4V to 7V

0.005

%/V

Error Amp GM

330

uMhos

Error Amp Voltage Gain

180

VC Source Current

VFB = 1V

µA

VC Sink Current

VFB = 1.5V

µA

VC Pin to Switch Current Gain

2.4

A/V

VC Switching Threshold

0.75

VC Clamp Voltage

1.8

Switching Frequency

VFB = 1.1V

1.1

1.25

MHz

0.95

1.1

1.35

MHz

Switching Phase

150

180

210

Deg

Maximum Duty Cycle

Frequency Shift Threshold on FB

fSW = 1MHz

0.5

Consult LTC Marketing for parts specified with wider operating temperature ranges.

FE PACKAGE

16-LEAD PLASTIC TSSOP

EXPOSED PAD (PIN 17) IS GND

MUST BE SOLDERED TO PCB

TOP VIEW

BOOST1

SW1

VIN

SW2

BOOST2

FB1

VC1

PG1

RUN/SS1

RUN/SS2

PG2

VC2

FB2

FE PART

MARKING

1940EFE

1940LEFE

LT1940 датащи(PDF) 2 Page - Linear Technology

LT1940 датащи(HTML) 2 Page - Linear Technology

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20

датащи скачать

ссылки URL