LT1943EFE datasheet(2/12 Pages) LINER

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LT1943

1943i

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

Minimum Input Voltage

4.5

Maximum Input Voltage

Quiescent Current

Not Switching

RUN-SS = SS-234 = 0V

µA

RUN-SS, SS-234 Pin Current

RUN-SS, SS-234 = 0.4V

1.7

µA

RUN-SS, SS-234 Threshold

0.8

BIAS Pin Voltage to Begin SS-234 Charge

2.4

2.8

3.15

BIAS Pin Current

BIAS = 3.1V, All Switches Off

10.5

FB Threshold Offset to Begin CT Charge

(Note 3)

125

160

CT Pin Current Source

All FB Pins = 1.5V

µA

CT Threshold to Power VON

All FB Pins = 1.5V

1.0

1.1

1.2

VON Switch Drop

VON Current = 30mA

180

240

Maximum VON Current

VE3 = 30V

PGOOD Threshold Offset

125

160

PGOOD Pin Leakage

VPGOOD = 36V

µA

Master Oscillator Frequency

1.1

1.2

1.35

MHz

1.0

1.46

MHz

Foldback Switching Frequency

All FB Pins = 0V

250

kHz

Frequency Shift Threshold on FB

∆200kHz

0.5

VIN Voltage .............................................................. 25V

BOOST Voltage ........................................................ 36V

BOOST Voltage Above SW1 ..................................... 25V

BIAS Pin Voltage ..................................................... 18V

SW2, SW4 Pin Voltages .......................................... 40V

SW3 Voltage ............................................................ 36V

FB1, FB2, FB3, FB4 Voltages ...................................... 4V

NFB4 Voltage ................................................ +6V, –0.6V

VC1, VC2, VC3, VC4 Pin Voltages .............................. 6V

RUN-SS, SS-234 Pin Voltages ................................... 6V

PGOOD Pin Voltage ................................................. 36V

E3 Pin Voltage ......................................................... 36V

VON Voltage ............................................................. 36V

CT Pin Voltage ........................................................... 6V

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 = 150°C, θJA = 25°C/W, θJC = 7.5°C/W

LT1943EFE

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 = 12V, RUN-SS, SS-234 = 2.5V unless otherwise noted.

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

TOP VIEW

GND

VC1

VC2

FB1

FB2

FB3

NFB4

FB4

VC3

VC4

SGND

BOOST

SW1

SW2

VON

PGOOD

BIAS

SW3

GND

SW4

RUN-SS

SS-234

VIN

FE PACKAGE

28-LEAD PLASTIC TSSOP

EXPOSED PAD (PIN 29) IS GROUND

(MUST BE SOLDERED TO PCB)

FE PART MARKING

1943EFE

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