LTC1647-2CS8 datasheet(3/20 Pages) LINER

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LTC1647-1/LTC1647-2/LTC1647-3

∆VGATE

External MOSFET Gate Drive

(VGATE – VCC), VCC1 = VCC2 = 5V

(VGATE – VCC), VCC1 = VCC2 = 12V

VONHI

ONX Threshold High

1.20

1.29

1.38

VONLO

ONX Threshold Low

1.17

1.21

1.25

VONHYST

ONX Hysteresis

IIN

ONX Input Current

ON = GND or VCC

±1

±10

µA

VOL

FAULT X Output Low Voltage

IO = 1mA, VCC = 5V

0.4

(LTC1647-2, LTC1647-3)

IO = 5mA, VCC = 5V

0.8

ILEAK

FAULT X Output Leakage Current

No Fault, FAULT X = VCC = 5V

±1

±10

µA

(LTC1647-3)

tFAULT

Circuit Breaker Delay Time

VCCX – VSENSEX = 0 to 100mV

0.3

µs

tRESET

Circuit Breaker Reset Time

ONX High to Low, to FAULT X High

100

µs

tON

Turn-On Time

ONX Low to High, to GATE X On

µs

tOFF

Turn-Off Time

ONX High to Low, to GATE X Off

µs

ELECTRICAL CHARACTERISTICS The q denotes the specifications which apply over the full operating

temperature range, otherwise specifications are at TA = 25°C. VCC = 5V unless otherwise noted. (Note 2)

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

Note 1: Absolute Maximum Ratings are those values beyond which the life

of a device may be impaired.

Note 2: All currents into device pins are positive; all currents out of device

pins are negative. All voltages are referenced to ground unless otherwise

specified.

Note 3: An internal Zener on the GATE pins clamp the charge pump

voltage to a typical maximum operating voltage of 28V. External overdrive

of the GATE pin beyond the internal Zener voltage may damage the device.

The GATE capacitance must be < 0.15

µF at maximum VCC. If a lower GATE

pin clamp voltage is desired, use an external Zener diode.

Note 4: The total supply current ICC is measured with VCC1 and VCC2

connected internally (LTC1647-1, LTC1647-2) or externally (LTC1647-3).

Note 5: The individual supply current ICCX is measured on the LTC1647-3.

The lower of the two supplies, VCC1 and VCC2, will have its channel’s

current. The higher supply will carry the additional supply current of the

charge pump and the bias generator beside its channel’s current.

LTC1647-1 Pinout

DESCRIPTION

1VCC

ON1

ON2

GND

LTC1647-3 Pinout

DESCRIPTION

1VCC1

ON1

FAULT 1

ON2

FAULT 2

6NC

7NC

GND

DESCRIPTION

GATE 2

GATE 1

SENSE 2

SENSE 1

DESCRIPTION

9NC

GATE 2

GATE 1

SENSE 2

SENSE 1

VCC2

LTC1647-2 Pinout

DESCRIPTION

1VCC

ON1 and FAULT 1

(Internally Tied Together)

ON2 and FAULT 2

(Internally Tied Together)

GND

DESCRIPTION

GATE 2

GATE 1

SENSE 2

SENSE 1

LTC1647-1 does not have the FAULT status feature.

The ONX/FAULT X must be connected to a driver via a resistor if the

autoretry feature is being used..

PI TABLES

LTC1647-2CS8 Datasheet(PDF) 3 Page - Linear Technology

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