LTC1735-1 datasheet(2/28 Pages) LINER

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LTC1735-1

ABSOLUTE

AXI U

RATI GS

PACKAGE/ORDER I FOR ATIO

(Note 1)

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

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

Switch Voltage (SW) ................................... 36V to – 5V

INTVCC, EXTVCC (BOOST, SW) Voltages ..... 7V to –0.3V

SENSE+, SENSE–,

PGOOD Voltages ................ 1.1(INTVCC + 0.3V) to –0.3V

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

RUN/SS Voltage ....................(INTVCC + 0.3V) to –0.3V

Peak Driver Output Current <10

µs (TG, BG) .............. 3A

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

Operating Ambient Temperature Range

LTC1735C-1 ............................................ 0

°C to 85°C

LTC1735I-1 ........................................ – 40

°C to 85°C

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

°C

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

°C to 150°C

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

°C

ELECTRICAL CHARACTERISTICS

ORDER PART

NUMBER

LTC1735CGN-1

LTC1735CS-1

LTC1735IGN-1

LTC1735IS-1

Consult factory for Military grade parts.

TJMAX = 125°C, θJA = 130°C/W (GN)

TJMAX = 125°C, θJA = 110°C/W (S)

TOP VIEW

S PACKAGE

16-LEAD PLASTIC SO

GN PACKAGE

16-LEAD PLASTIC SSOP

COSC

RUN/SS

ITH

PGOOD

SENSE–

SENSE+

VOSENSE

SGND

BOOST

VIN

INTVCC

PGND

EXTVCC

The q denotes specifications which apply over the full operating

temperature range, otherwise specifications are at TA = 25°C. VIN = 15V, VRUN/SS = 5V unless otherwise noted.

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

Main Control Loop

IVOSENSE

Feedback Current

(Note 3)

– 4

– 25

VOSENSE

Feedback Voltage

(Note 3)

0.792

0.8

0.808

∆VLINEREG

Reference Voltage Line Regulation

VIN = 3.6V to 30V (Note 3)

0.001

0.02

%/V

∆VLOADREG

Output Voltage Load Regulation

(Note 3)

Measured in Servo Loop; VITH = 0.7V

0.1

0.3

Measured in Servo Loop; VITH = 2V

– 0.1

– 0.3

DF Max

Maximum Duty Factor

In Dropout

99.4

Transconductance Amplifier gm

1.3

mmho

VOVL

Feedback Overvoltage Lockout

0.84

0.86

0.88

Input DC Supply Current

(Note 5)

Normal Mode

3.6V < VIN < 30V

450

µA

Shutdown

VRUN/SS = 0V

µA

VRUN/SS

Run Pin Start Threshold

VRUN/SS, Ramping Positive

1.0

1.5

1.9

Run Pin Begin Latchoff Threshold

VRUN/SS, Ramping Positive

4.1

4.5

IRUN/SS

Soft-Start Charge Current

VRUN/SS = 0V

– 0.7

– 1.2

µA

ISCL

RUN/SS Discharge Current

Soft Short Condition, VOSENSE = 0.5V,

0.5

µA

VRUN/SS = 4.5V

UVLO

Undervoltage Lockout

Measured at VIN Pin (Ramping Negative)

3.5

3.9

∆VSENSE(MAX)

Maximum Current Sense Threshold

VOSENSE = 0.7V

ISENSE

SENSE Pins Total Source Current

VSENSE– = VSENSE+ = 0V

µA

tON(MIN)

Minimum On-Time

Tested with a Square Wave (Note 4)

160

200

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