LTC1709-7 datasheet(2/24 Pages) LINER

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LTC1778/LTC1778-1

1778fb

Input Supply Voltage (VIN, ION)................. 36V to –0.3V

Boosted Topside Driver Supply Voltage

(BOOST) ................................................... 42V to – 0.3V

SW Voltage .................................................. 36V to – 5V

EXTVCC, (BOOST – SW), RUN/SS,

PGOOD Voltages ....................................... 7V to – 0.3V

FCB, VON, VRNG Voltages .......... INTVCC + 0.3V to –0.3V

ITH, VFB Voltages...................................... 2.7V to –0.3V

ORDER PART

NUMBER

LTC1778EGN

LTC1778IGN

TJMAX = 125°C, θJA = 130°C/ W

ABSOLUTE

AXI U

RATI GS

PACKAGE/ORDER I FOR ATIO

GN PART MARKING

1778

1778I

TG, BG, INTVCC, EXTVCC Peak Currents.................... 2A

TG, BG, INTVCC, EXTVCC RMS Currents .............. 50mA

Operating Ambient Temperature Range (Note 4)

LTC1778E ........................................... – 40°C to 85°C

LTC1778I .......................................... – 40°C to 125°C

Junction Temperature (Note 2) ............................ 125°C

Storage Temperature Range ................. – 65°C to 150°C

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

TOP VIEW

GN PACKAGE

16-LEAD PLASTIC SSOP

RUN/SS

PGOOD

VRNG

FCB

ITH

SGND

ION

VFB

BOOST

PGND

INTVCC

VIN

EXTVCC

ORDER PART

NUMBER

LTC1778EGN-1

GN PART MARKING

17781

TOP VIEW

GN PACKAGE

16-LEAD PLASTIC SSOP

RUN/SS

VON

VRNG

FCB

ITH

SGND

ION

VFB

BOOST

PGND

INTVCC

VIN

EXTVCC

The

● denotes specifications which apply over the full operating

temperature range, otherwise specifications are TA = 25°C. VIN = 15V unless otherwise noted.

ELECTRICAL CHARACTERISTICS

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

Main Control Loop

Input DC Supply Current

Normal

900

2000

µA

Shutdown Supply Current

µA

VFB

Feedback Reference Voltage

ITH = 1.2V (Note 3) LTC1778E

●

0.792

0.800

0.808

ITH = 1.2V (Note 3) LTC1778I

●

0.792

0.800

0.812

∆VFB(LINEREG)

Feedback Voltage Line Regulation

VIN = 4V to 30V, ITH = 1.2V (Note 3)

0.002

%/V

∆VFB(LOADREG) Feedback Voltage Load Regulation

ITH = 0.5V to 1.9V (Note 3)

●

– 0.05

– 0.3

IFB

Feedback Input Current

VFB = 0.8V

–5

±50

gm(EA)

Error Amplifier Transconductance

ITH = 1.2V (Note 3)

●

1.4

1.7

VFCB

Forced Continuous Threshold

●

0.76

0.8

0.84

IFCB

Forced Continuous Pin Current

VFCB = 0.8V

– 1

– 2

µA

tON

On-Time

ION = 30µA, VON = 0V (LTC1778-1)

198

233

268

ION = 15µA, VON = 0V (LTC1778-1)

396

466

536

tON(MIN)

Minimum On-Time

ION = 180µA

100

TJMAX = 125°C, θJA = 130°C/ W

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

(Note 1)

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