LTC1647-3_15,LTC1647-3_15 pdf中文资料,LTC1647-3_15引脚图,LTC1647-3

LTC1647-1/

LTC1647-2/LTC1647-3

Dual Hot Swap Controllers

FEATURES

n

DESCRIPTION

The LTC

®

1647-1/LTC1647-2/LTC1647-3 are dual Hot

Swap™ controllers that permit a board to be safely inserted

and removed from a live backplane.

Using external N-channel MOSFETs, the board supply

voltages can be ramped up at a programmable rate. A high

side switch driver controls the MOSFET gates for supply

voltages ranging from 2.7V to 16.5V. A programmable

electronic circuit breaker protects against overloads and

shorts. The ON pins are used to control board power or

clear a fault.

The LTC1647-1 is a dual Hot Swap controller with a

common V

CC

pin, separate ON pins and is available in an

SO-8 package. The LTC1647-2 is similar to the LTC1647-1

but combines a fault status flag with automatic retry at

the ON pins and is also available in the SO-8 package. The

LTC1647-3 has individual V

CC

pins, ON pins and

FAULT

status pins for each channel and is available in a 16-lead

narrow SSOP package.

Allows Safe Board Insertion and Removal from a

Live Backplane

Programmable Electronic Circuit Breaker

FAULT Output Indication

Programmable Supply Voltage Power-Up Rate

High Side Drive for External MOSFET Switches

Controls Supply Voltages from 2.7V to 16.5V

Undervoltage Lockout

APPLICATIONS

n

Hot Board Insertion

Electronic Circuit Breaker

Portable Computer Device Bays

Hot Plug Disk Drive

L,

LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear

Technology Corporation. Hot Swap is a trademark of Linear Technology Corporation. All other

trademarks are the property of their respective owners.

TYPICAL APPLICATION

Dual Motherboard Resident Hot Swap Controller

12V

SUPPLY

20mΩ

IRF7413

ON/OFF Sequence

V

OUT1

(2.5A)

+

C

LOAD

10Ω

V

ON

5V/DIV

V

GATE

10V/DIV

V

CC

ON1

ON2

ON1

ON2

GND

SENSE 1 GATE 1

LTC1647-1

SENSE 2 GATE 2

10nF

DDZ23*

V

OUT

5V/DIV

10ms/DIV

10nF

DDZ23*

1647-1/2/3 TA01a

10Ω

20mΩ

IRF7413

*REQUIRED FOR V

CC

> 10V

+

C

LOAD

1647-1/2/3 TA01

V

OUT2

(2.5A)

1647fa

1

LTC1647-1/

LTC1647-2/LTC1647-3

ABSOLUTE MAXIMUM RATINGS

(Note 1)

PIN CONFIGURATION

Operating Temperature Range

C-Grade ................................................... 0°C to 70°C

I-Grade................................................. –40°C to 85°C

Storage Temperature Range................... –65°C to 150°C

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

Supply Voltage (V

CC

) ................................................17V

Input Voltage (SENSE) ................. – 0.3V to (V

CC

+ 0.3V)

Input Voltage (ON) .....................................– 0.3V to 17V

Output Voltage (FAULT) ..............................– 0.3V to 17V

Output Voltage (GATE) ...........Internally Limited (Note 3)

PIN CONFIGURATION

TOP VIEW

V

CC1

TOP VIEW

V

CC

1

ON1 2

ON2 3

GND 4

8

7

6

5

SENSE1

SENSE2

GATE1

GATE2

V

CC

1

ON1/FAULT1 2

ON2/FAULT2 3

GND 4

TOP VIEW

8

7

6

5

SENSE1

SENSE2

GATE1

GATE2

ON1

FAULT1

ON2

FAULT2

NC

GND

1

2

3

4

5

6

7

8

16 V

CC2

15 SENSE1

14 SENSE2

13 GATE1

12 GATE2

11 NC

10 NC

9

NC

S8 PACKAGE

8-LEAD PLASTIC SO

T

JMAX

= 150°C,

q

JA

= 130°C/W

S8 PACKAGE

8-LEAD PLASTIC SO

T

JMAX

= 150°C,

q

JA

= 130°C/W

GN PACKAGE

16-LEAD PLASTIC SSOP

T

JMAX

= 150°C,

q

JA

= 130°C/W

ORDER INFORMATION

LEAD FREE FINISH

LTC1647-1CS8#PBF

LTC1647-1IS8#PBF

LTC1647-2CS8#PBF

LTC1647-2IS8#PBF

LTC1647-3CGN#PBF

LTC1647-3IGN#PBF

TAPE AND REEL

LTC1647-1CS8#TRPBF

LTC1647-1IS8#TRPBF

LTC1647-2CS8#TRPBF

LTC1647-2IS8#TRPBF

LTC1647-3CGN#TRPBF

LTC1647-3IGN#TRPBF

PART MARKING*

16471

16471I

16472

16472I

16473

16473I

PACKAGE DESCRIPTION

8-Lead (4mm

¥

3mm) Plastic SO

8-Lead (4mm

¥

3mm) Plastic SO

8-Lead (4mm

¥

3mm) Plastic SO

8-Lead (4mm

¥

3mm) Plastic SO

16-Lead Plastic SSOP

TEMPERATURE RANGE

0°C to 70°C

–40°C to 85°C

0°C to 70°C

–40°C to 85°C

0°C to 70°C

–40°C to 85°C

Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.

For more information on lead free part marking, go to:

http://www.linear.com/leadfree/

For more information on tape and reel specifications, go to:

http://www.linear.com/tapeandreel/

1647fa

2

LTC1647-1/

LTC1647-2/LTC1647-3

ELECTRICAL CHARACTERISTICS

SYMBOL PARAMETER

V

CC

I

CC

I

CCX

V

LKO

V

LKH

V

CB

I

CP

V

CCX

Supply Range

V

CC

Supply Current (Note 4)

V

CCX

Supply Current (Note 5, LTC1647-3)

V

CCX

Undervoltage Lockout

V

CCX

Undervoltage Lockout Hysteresis

Circuit Breaker Trip Voltage

GATEX Output Current

V

CB

= V

CCX

– V

SENSEX

ONX High,

FAULTX

High, V

GATE

= GND (Sourcing)

ONX Low,

FAULTX

High, V

GATE

= V

CC

(Sinking)

ONX High,

FAULTX

Low, V

GATE

= 15V (Sinking)

(V

GATE

– V

CC

), V

CC1

= V

CC2

= 5V

(V

GATE

– V

CC

), V

CC1

= V

CC2

= 12V

l

The

l

denotes the specifications which apply over the full operating

temperature range, otherwise specifications are at T

A

= 25°C.

CONDITIONS

Operating Range

ON1, ON2 = V

CC1

= V

CC2

, I

CC

= I

CC1

+ I

CC2

ONX = V

CCX

, I

CCX

Individually Measured,

V

CC1

= 5V, V

CC2

= 12V or V

CC1

= 12V, V

CC2

= 5V

Coming Out of UVLO (Rising V

CCX

)

l

MIN

2.7

TYP

1.0

0.5

MAX

16.5

6

5

2.60

60

14

UNITS

V

mA

V

mV

μA

mA

V

mV

μA

V

μA

μs

2.30

40

6

2.45

210

50

10

50

13

15

1.29

1.21

70

±1

0.8

±1

0.3

ΔV

GATE

V

ONHI

V

ONLO

I

IN

V

OL

I

LEAK

t

FAULT

t

RESET

t

ON

t

OFF

External MOSFET Gate Drive

ONX Threshold High

ONX Threshold Low

ONX Input Current

FAULTX

Output Low Voltage

(LTC1647-2, LTC1647-3)

FAULTX

Output Leakage Current

(LTC1647-3)

Circuit Breaker Delay Time

Circuit Breaker Reset Time

Turn-On Time

Turn-Off Time

l

10

1.20

1.17

17

19

1.38

1.25

±10

0.4

±10

V

ONHYST

ONX Hysteresis

ON = GND or V

CC

I

O

= 1mA, V

CC

= 5V

I

O

= 5mA, V

CC

= 5V

No Fault,

FAULTX

= V

CC

= 5V

V

CCX

– V

SENSEX

= 0 to 100mV

ONX High to Low, to

FAULTX

High

ONX Low to High, to GATEX On

ONX High to Low, to GATEX Off

l

50

2

1

100

μs

Note 1:

Stresses beyond those listed under Absolute Maximum Ratings

may cause permanent damage to the device. Exposure to any Absolute

Maximum Rating condition for extended periods may affect device

reliability and lifetime.

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 V

CC

. If a lower GATE

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

Note 4:

The total supply current I

CC

is measured with V

CC1

and V

CC2

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

Note 5:

The individual supply current I

CCX

is measured on the LTC1647-3.

The lower of the two supplies, V

CC1

and V

CC2

, 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.

1647fa

3

LTC1647-1/

LTC1647-2/LTC1647-3

PIN TABLES

LTC1647-1 Pinout

1

2

3

4

DESCRIPTION

V

CC

ON1

ON2

GND

5

6

7

8

DESCRIPTION

GATE2

GATE1

SENSE2

SENSE1

LTC1647-3 Pinout

1

2

3

4

5

6

7

5

6

7

8

DESCRIPTION

GATE2

GATE1

SENSE2

SENSE1

8

DESCRIPTION

V

CC

ON1

FAULT1

ON2

FAULT2

NC

GND

9

10

11

12

13

14

15

16

DESCRIPTION

NC

GATE2

GATE1

SENSE2

SENSE1

V

CC2

LTC1647-1 Does Not Have the FAULT Status Feature.

LTC1647-2 Pinout

1

2

3

4

DESCRIPTION

V

CC

ON1 and

FAULT1

(Internally Tied Together)

ON1 and

FAULT2

(Internally Tied Together)

GND

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

autoretry feature is being used.

TYPICAL PERFORMANCE CHARACTERISTICS

I

CC

vs V

CC

6

5

4

I

CC

(mA)

I

CC

(mA)

3

2

1

0

2

4

6

8

10 12

V

CC

(V)

14

16

18

T

A

= 25°C

I

CC

= I

CC1

+ I

CC2

V

CC

= V

CC1

= V

CC2

= ON1 = ON2

6

5

4

3

2

V

CC

= 5V

1

0

–75 –50 –25

V

CC

= 3V

0 25 50 75 100 125 150

TEMPERATURE (°C)

1647-1/2/3 G02

I

CC

vs Temperature

5

I

CC

= I

CC1

+ I

CC2

V

CC

= V

CC1

= V

CC2

= ON1 = ON2

4

I

CC1

vs V

CC2

T

A

= 25°C

V

CC

= 15V

V

CC

= 12V

I

CC1

(mA)

3

V

CC1

= 15V

V

CC1

= 12V

2

V

CC1

= 5V

V

CC1

= 3V

0

2

4

6

8 10 12 14 16 18 20

V

CC2

(V)

1647-1/2/3 G03

1

1647-1/2/3 G01

1647fa

4

LTC1647-1/

LTC1647-2/LTC1647-3

TYPICAL PERFORMANCE CHARACTERISTICS

I

CC2

vs V

CC2

5

T

A

= 25°C

4

(V

GATE

– V

CC

) (V)

20

18

16

14

V

GATE

(V)

T

A

= 25°C

V

CC

= V

CC1

= V

CC2

0

2

4

6

8

10 12 14 16 18 20

V

CC

(V)

1647-1/2/3 G05

(V

GATE

– V

CC

) vs V

CC

30

25

20

15

10

5

0

V

GATE

vs V

CC

I

CC2

(mA)

3

V

CC1

= 15V

V

CC1

= 12V

V

CC1

= 3V

12

10

8

6

4

2

1

V

CC1

= 5V

0

2

4

6

8 10 12 14 16 18 20

V

CC2

(V)

1647-1/2/3 G04

2

0

T

A

= 25°C

V

CC

= V

CC1

= V

CC2

0

2

4

6

8

10 12 14 16 18 20

V

CC

(V)

1647-1/2/3 G06

(V

GATE

– V

CC

) vs Temperature

20

18

16

(V

GATE

– V

CC

) (V)

14

V

GATE

(V)

12

10

8

6

4

2

0

–75 –50 –25

V

CC

= V

CC1

= V

CC2

0 25 50 75 100 125 150

TEMPERATURE (°C)

1647-1/2/3 G07

V

GATE

vs Temperature

35

20

V

CC

= 15V

18

16

V

CC

= 5V

20

15

10

5

0

–75 –50 –25

V

CC

= V

CC1

= V

CC2

0 25 50 75 100 125 150

TEMPERATURE (°C)

1647-1/2/3 G08

(V

GATE1

– V

CC1

) vs Temperature

V

CC1

= 12V

V

CC

= 12V

V

CC

= 5V

30

25

V

CC

= 12V

(V

GATE1

– V

CC1

) (V)

14

12

10

8

6

4

2

0

2

4

6

V

CC1

= 3V

T

A

= 25°C

(LTC1647-3)

8 10 12 14 16 18 20

V

CC2

(V)

1647-1/2/3 G09

V

CC1

= 5V

V

CC1

= 15V

V

CC

= 15V

V

CC

= 3V

V

CC

= 3V

V

GATE1

vs V

CC2

35

GATE OUTPUT SOURCE CURRENT (μA)

V

CC1

= 15V

30

25

V

GATE1

(V)

20

15

10

5

0

T

A

= 25°C

(LTC1647-3)

0

2

4

6

8 10 12 14 16 18 20

V

CC2

(V)

1647-1/2/3 G10

GATE Output Source Current

vs V

CC

14

GATE OUTPUT SOURCE CURRENT (μA)

13

12

11

10

9

8

7

6

0

2

4

6

8

10 12 14 16 18 20

V

CC

(V)

1647-1/2/3 G11

GATE Output Source Current

vs Temperature

14

13

12

11

10

9

8

7

6

–75 –50 –25

0 25 50 75 100 125 150

TEMPERATURE (°C)

1647-1/2/3 G12

T

A

= 25°C

V

CC

= V

CC1

=V

CC2

V

CC

= V

CC1

= V

CC2

= 5V

V

CC1

= 12V

V

CC1

= 5V

V

CC1

= 3V

1647fa

5

LTC1647-3_15

LTC1647-3_15概述

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