LTC1435AC datasheet(2/20 Pages) LINER

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LTC1435A

ABSOLUTE MAXIMUM RATINGS

PACKAGE/ORDER INFORMATION

ORDER PART

NUMBER

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

Topside Driver Supply Voltage (BOOST)....42V to – 0.3V

Switch Voltage (SW)............................. VIN + 5V to –5V

EXTVCC Voltage ........................................ 10V to – 0.3V

SENSE +, SENSE – Voltages ...... INTVCC + 0.3V to – 0.3V

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

SFB, Run/SS Voltages .............................. 10V to – 0.3V

Peak Driver Output Current < 10

µs (TG, BG) ............. 2A

INTVCC Output Current ........................................ 50mA

Operating Ambient Temperature Range

LTC1435AC ............................................ 0

°C to 70°C

LTC1435AI ......................................... – 40

°C to 85°C

Junction Temperature (Note 1)............................. 125

°C

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

°C to 150°C

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

°C

TJMAX = 125°C, θJA = 130°C/ W (G)

TJMAX = 125°C, θJA = 110°C/ W (S)

Consult factory for Military grade parts.

LTC1435ACG

LTC1435ACS

LTC1435AIG

LTC1435AIS

TOP VIEW

S PACKAGE

16-LEAD PLASTIC SO

G PACKAGE

16-LEAD PLASTIC SSOP

COSC

RUN/SS

ITH

SFB

SGND

VOSENSE

SENSE–

SENSE+

BOOST

VIN

INTVCC

PGND

EXTVCC

TA = 25°C, VIN = 15V, VRUN/SS = 5V unless otherwise noted.

ELECTRICAL CHARACTERISTICS

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

Main Control Loop

IIN VOSENSE

Feedback Current

(Note 2)

VOSENSE

Feedback Voltage

(Note 2)

1.178

1.19

1.202

∆VLINEREG

Reference Voltage Line Regulation

VIN = 3.6V to 20V (Note 2)

0.002

0.01

%/V

∆VLOADREG

Output Voltage Load Regulation

ITH Sinking 5µA (Note 2)

0.5

0.8

ITH Sourcing 5µA

– 0.5

– 0.8

VSFB

Secondary Feedback Threshold

VSFB Ramping Negative

1.16

1.19

1.22

ISFB

Secondary Feedback Current

VSFB = 1.5V

– 1

– 2

µA

VOVL

Output Overvoltage Lockout

1.24

1.28

1.32

Input DC Supply Current

EXTVCC = 5V (Note 3)

Normal Mode

3.6V < VIN < 30V

280

µA

Shutdown

VRUN/SS = 0V, 3.6V < VIN < 15V

µA

VRUN/SS

Run Pin Threshold

0.8

1.3

IRUN/SS

Soft Start Current Source

VRUN/SS = 0V

1.5

4.5

µA

∆VSENSE(MAX) Maximum Current Sense Threshold

VOSENSE = 0V, 5V

130

150

180

tON(MIN)

Minimum On-Time

Tested with Square Wave, SENSE – = 1.6V,

250

300

∆VSENSE = 20mV (Note 5

)

TG Transition Time

TG tr

Rise Time

CLOAD = 3000pF

150

TG tf

Fall Time

CLOAD = 3000pF

150

BG Transition Time

BG tr

Rise Time

CLOAD = 3000pF

150

BG tf

Fall Time

CLOAD = 3000pF

150

Internal VCC Regulator

VINTVCC

Internal VCC Voltage

6V < VIN < 30V, VEXTVCC = 4V

4.8

5.0

5.2

VLDO INT

INTVCC Load Regulation

IINTVCC = 15mA, VEXTVCC = 4V

– 0.2

– 1

VLDO EXT

EXTVCC Voltage Drop

IINTVCC = 15mA, VEXTVCC = 5V

130

230

VEXTVCC

EXTVCC Switchover Voltage

IINTVCC = 15mA, VEXTVCC Ramping Positive

4.5

4.7

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