LTC1647-3 データシートの表示（PDF） - Linear Technology

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LTC1647-3

Dual Hot Swap Controllers

Linear Technology 

LTC1647-1/LTC1647-2/LTC1647-3

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

∆VGATE External MOSFET Gate Drive

VONHI

VONLO

VONHYST

IIN

VOL

ILEAK

ONX Threshold High

ONX Threshold Low

ONX Hysteresis

ONX Input Current

FAULT X Output Low Voltage

(LTC1647-2, LTC1647-3)

FAULT X Output Leakage Current

(LTC1647-3)

(VGATE – VCC), VCC1 = VCC2 = 5V

(VGATE – VCC), VCC1 = VCC2 = 12V

ON = GND or VCC

IO = 1mA, VCC = 5V

IO = 5mA, VCC = 5V

No Fault, FAULT X = VCC = 5V

q 10

13

17

V

q 10

15

19

V

q 1.20 1.29 1.38

V

q 1.17 1.21 1.25

V

70

mV

q

±1

±10

µA

q

0.4

V

0.8

V

±1

±10

µA

tFAULT

tRESET

tON

tOFF

Circuit Breaker Delay Time

Circuit Breaker Reset Time

Turn-On Time

Turn-Off Time

VCCX – VSENSEX = 0 to 100mV

ONX High to Low, to FAULT X High

ONX Low to High, to GATE X On

ONX High to Low, to GATE X Off

0.3

µs

q

50

100

µs

2

µs

1

µs

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 < 0.15µF 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.

PI TABLES

LTC1647-1 Pinout

PIN DESCRIPTION

1

VCC

2 ON1

3 ON2

4 GND

PIN DESCRIPTION

5 GATE 2

6 GATE 1

7 SENSE 2

8 SENSE 1

LTC1647-1 does not have the FAULT status feature.

LTC1647-2 Pinout

PIN DESCRIPTION

1

VCC

2 ON1 and FAULT 1

(Internally Tied Together)

3 ON2 and FAULT 2

(Internally Tied Together)

4 GND

PIN DESCRIPTION

5 GATE 2

6 GATE 1

7 SENSE 2

8 SENSE 1

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

autoretry feature is being used..

LTC1647-3 Pinout

PIN DESCRIPTION

1

VCC1

2 ON1

3 FAULT 1

4 ON2

5 FAULT 2

6 NC

7 NC

8 GND

PIN DESCRIPTION

9 NC

10 NC

11 NC

12 GATE 2

13 GATE 1

14 SENSE 2

15 SENSE 1

16 VCC2

3

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