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LT1507

Input Voltage ........................................................... 16V

Boost Pin Voltage .................................................... 25V

Shutdown Pin Voltage ............................................... 7V

FB Pin Voltage (Adjustable Part) ............................. 3.5V

FB Pin Current (Adjustable Part) ............................. 1mA

Sense Voltage (Fixed 3.3V Part) ................................ 5V

Sync Pin Voltage ....................................................... 7V

Operating Ambient Temperature Range

LT1507C .................................................. 0

°C to 70°C

LT1507I .............................................. – 40

°C to 85°C

Max Operating Junction Temperature ................... 125

°C

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

°C to 150°C

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

°C

ABSOLUTE MAXIMUM RATINGS

PACKAGE/ORDER INFORMATION

TJMAX = 125°C, θJA = 80°C/W TO 120°C/ W (N)

TJMAX = 125°C, θJA = 120°C/W TO 170°C/ W (S)

DEPENDING ON PC BOARD LAYOUT

TOP VIEW

FB/SENSE

GND

SYNC

BOOST

VIN

VSW

SHDN

N8 PACKAGE

8-LEAD PDIP

S8 PACKAGE

8-LEAD PLASTIC SO

Consult factory for Military grade parts.

ORDER PART

NUMBER

LT1507CN8

LT1507CN8-3.3

LT1507CS8

LT1507CS8-3.3

LT1507IN8

LT1507IN8-3.3

LT1507IS8

LT1507IS8-3.3

S8 PART MARKING

ELECTRICAL CHARACTERISTICS

TJ = 25°C, VIN = 5V, VC = 1.5V, boost open, switch open unless otherwise specified.

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

Reference Voltage (Adjustable)

2.39

2.42

2.45

All Conditions

2.36

2.48

Sense Voltage (3.3V)

3.25

3.3

3.35

All Conditions

3.23

3.37

Sense Pin Resistance

4.0

6.6

9.5

Ω

Reference Voltage Line Regulation

4.3V

≤ VIN ≤ 15V

0.01

0.03

%/V

FB Input Bias Current

0.5

µA

Error Amplifier Voltage Gain (Note 8)

(Note 1)

150

400

Error Amplifier Transconductance (Note 8)

∆I(VC) = ±10µA

1500

2000

2700

µmho

1100

3000

µmho

VC Pin to Switch Current

Transconductance

A/V

Error Amplifier Source Current

VFB = 2.1V or VSENSE = 2.9V

150

225

320

µA

Error Amplifier Sink Current

VFB = 2.7V or VSENSE = 3.7V

VC Pin Switching Threshold

Duty Cycle = 0

0.9

VC Pin High Clamp

VFB = 2.1V or VSENSE = 2.9V

2.1

Switch Current Limit

VC Open, VFB = 2.1V or VSENSE = 2.9V

≤ 50% q

1.50

VIN ≥ 5V, VBOOST = VIN + 5V

DC = 80%

1.35

Switch On Resistance (Note 6)

ISW = 1.5A, VBOOST = VIN + 5V

0.3

0.4

Ω

0.5

Ω

Maximum Switch Duty Cycle

VFB = 2.1V or VSENSE = 2.9V

1507I

1507I3

1507

15073

LT1507 Datasheet(PDF) 2 Page - Linear Technology

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