LT1680IN datasheet(2/16 Pages) LINER

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LT1680

ABSOLUTE MAXIMUM RATINGS

PACKAGE/ORDER INFORMATION

LT1680CN

LT1680CSW

LT1680IN

LT1680ISW

ORDER PART

NUMBER

TOP VIEW

SW PACKAGE

16-LEAD PLASTIC SO WIDE

N PACKAGE

16-LEAD PDIP

SL/ADJ

IAVG

SGND

VFB

VREF

5VREF

SYNC

12VIN

GATE

PGND

RUN/SHDN

SENSE –

SENSE +

TJMAX = 125°C, θJA = 75°C/ W (N)

TJMAX = 125°C, θJA = 90°C/ W (SW)

Consult factory for Military grade parts.

(Note 1)

Power Supply Voltage (12VIN) .................. –0.3V to 20V

Sense Amplifier Input Common Mode ...... – 0.3V to 60V

GATE Pin Voltage ....................... – 0.3V to 12VIN + 0.3V

RUN/SHDN Pin Voltage ......................... – 0.3V to 12VIN

All Other Pin Voltages ................................. – 0.3V to 7V

5V Reference Output Current ............................... 65mA

Operating Ambient Temperature Range

LT1680C .................................................. 0

°C to 70°C

LT1680I .............................................. – 40

°C to 85°C

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

°C to 150°C

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

°C

ELECTRICAL CHARACTERISTICS

12VIN = 12V, VVC = 2V, VFB = VREF = 1.25V, CGATE = 3000pF, TA = 25°C unless otherwise noted.

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

Supply and Protection

I12VIN

DC Active Supply Current (Note 2)

Gate Output On

Gate Output Off

DC Standby Supply Current

VRUN < 0.5V

110

µA

VRUN/SHDN Shutdown Rising Threshold

1.15

1.25

1.35

VSSHYST

Shutdown Threshold Hysteresis

ISS

Soft Start Charge Current

µA

VUVLO

Undervoltage Lockout Threshold - Falling

8.20

9.00

9.75

Undervoltage Lockout Threshold - Rising

9.35

9.95

Undervoltage Lockout Hysteresis

200

350

5V Reference

VREF5

5V Reference Voltage

Line, Load and Temperature

4.75

5.25

5V Reference Line Regulation

10V

≤ 12VIN ≤ 15V

mV/V

IREF5

5V Reference Load Range - DC

Pulse

5V Reference Load Regulation

≤ IREF5 ≤ 20mA

–1.25

– 2

V/A

ISC

5V Reference Short-Circuit Current

Error Amplifier

VFB

Error Amplifier Reference Voltage

Measured at Feedback Pin

1.242

1.250

1.258

1.235

1.265

IFB

Feedback Input Current

VFB = VREF

0.1

0.5

1.0

µA

Error Amplifier Transconductance

1200

2000

3200

µmho

Error Amplifier Voltage Gain

1500

3000

V/V

IVC

Error Amplifier Source Current

200

275

µA

Error Amplifier Sink Current

VFB – VREF = 500mV

280

400

µA

VVC

Absolute VC Clamp Voltage

Measured at VC Pin

3.5

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