ON Semiconductor NCP81295, NCP81296 User Manual

Hot Swap Smart Fuse

NCP81295, NCP81296

The NCP81295 and NCP81296 are 50 A, electronically re−settable,

in−line fuses for use in 12 V, high current applications such as servers, storage and base stations. The NCP81295/6 offers a very low 0.65 mW integrated MOSFET to reduce solution size and minimize power loss. It also integrates a highly accurate current sensor for monitoring and overload protection.

Power Features

• Co−packaged Power Switch, Hotswap Controller and Current Sense

• Up to 60 A Peak Current Output, 50 A Continuous

• Vin Range: 4.5 V to 18 V

• 0.65 mW, no R

Control Features

• Enable Input

• Optional Enable−controlled Output Pulldown when Disabled

• Programmable Soft−Start

• Programmable, Multi−level Current Limit

Reporting Features

• Accurate Analog Load Current Monitor

• Programmable Over Current Alert Output

• Analog Temperature Output

• Status Fault OK Output

SENSE

Required

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MARKING DIAGRAM

1

NCP8129x

32

1

LQFN32 5x5, 0.5P

CASE 487AA

NCP8129x = Specific Device Code x = 5 or 6 A = Assembly Location WL = Wafer Lot YY = Year WW = Work Week G = Pb−Free Package

(Note: Microdot may be in either location)

= (may or may not be present)

AWLYYWWG

G

Other Features

• 5 mm x 5 mm QFN32 Package

• Operating Temperature: −40°C to 125°C

• Can be Paralleled for Higher Current Applications

• Built−in Insertion Delay for Hotswap Applications

• NCP81295: Latch off for Following Protection Features

NCP81296: Auto−Retry Mode for Following Protection Features

♦ Current−limit after Delay ♦ Fast Short−circuit Protection ♦ Over−Temperature Shutdown ♦ Excessive Soft−start Duration

• Internal Switch Fault Diagnostics

• Low−power Auxiliary Output Voltage

PINOUT

323130

1

2

3

4

5

6

7

8

9

For more details see Figure 1.

29

NCP81295/6

(TOP VIEW)

33

VIN

12

11

10

282726

14

13

25

24

23

22

21

20

19

18

17

16

15

ORDERING INFORMATION

See detailed ordering and shipping information on page 2 of this data sheet.

April, 2020 − Rev. 12

1 Publication Order Number:

NCP81295/D

NCP81295, NCP81296

†

NC4 1

NC5

D_OC

ON

GOK

NC1

VINF

NC2

VOUT30

VOUT32

32

2

3

4

5

6

7

8

VOUT31

31

30

VOUT29

29

NCP81295 /6

(TOP VIEW)

VOUT28

28

33

VIN

VOUT27

27

VOUT26

26

VOUT25

25

24

23

22

21

20

19

18

17

CLREF

CS

IMON

VDD

GND

SS

VTEMP

GATE

9

VIN9

10

VIN10

11

VIN11

12

VIN12

13

VIN13

14

VIN14

15

VIN15

16

VIN16

Figure 1. Pin Configuration

Ordering Information

Table 1. AVAILABLE DEVICES

Device Package Shipping

NCP81295MNTXG QFN32 2500 / Tape & Reel

NCP81296MNTXG QFN32 2500 / Tape & Reel

†For information on tape and reel specifications, including part orientation and tape sizes, please refer to our Tape and Reel Packaging

Specifications Brochure, BRD8011/D.

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2

System VIN

NCP81295, NCP81296

VIN VINF

Input Voltage

GOK

D_OC

ON

VTEMP

IMON

GATE

CLREF

Figure 2.

Main Efuse

NCP81295/ 6

GND

VOUT

Typical Application

VDD

Fuse−protected

System VIN

CS

SS

Main System Power

Main System

E−Fuse IMON

E−Fuse Control/ Monitor

PMBSUS Control and Monitor

Standby System Power

E−Fuse Control/ Monitor

mController

Standby Efuse

E−Fuse Control/ Monitor

Figure 3. Typical Application Diagram

Standby System

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3

NCP81295, NCP81296

S

VIN

ystem

mController

FAULT IN

OVERCURRENT IN

ENABLE OUT

TEMP MONITOR A/D IN

CURRENT MONITOR A/D IN

CURRENT LIMIT D/A OUT

GOK

D_OC

ON

VTEMP

IMON

CLREF

GOK

D_OC

ON

VTEMP

VIN VINF

NCP81295

VOUT

GATE

GND

VIN VINF

NCP81295

VOUT

GATE

VDD

Fuse−protected

System VIN

SS

CS

VDD

Figure 4.

IMON

CLREF

GOK

D_OC

ON

VTEMP

IMON

CLREF

GND

VIN VINF

NCP81295

GND

SS

CS

VDD

VOUT

GATE

SS

CS

Application Schematic − Parallel Fuse Operation with Controller

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4

NCP81295, NCP81296

System VIN

mController

FAULT IN

OVERCURRENT IN

ENABLE OUT

TEMP MONITOR A/D IN

CURRENT LIMIT D/A OUT

CURRENT MONITOR A/D IN

Figure 5. Application Schematic − Single EFuse with Controller

System VIN

VIN

GOK

D_OC

ON

NCP81295/6

VTEMP

CLREF

IMON

GND

VINF

VDD

GATE

VOUT

VIN VINF

GOK

D_OC

NCP81295/6

ON

VTEMP

CLREF

IMON

CS

SS

GND

VDD

GATE

VOUT

CS

SS

Fuse Protected System VIN

Figure 6. Application Schematic − Stand−alone Single EFuse

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5

NCP81295, NCP81296

S

ystem VIN

VIN VINF

GOK

D_OC

ON

VTEMP

NCP81295

VDD

Fuse−protected

System VIN

VOUT

GATE

IMON

CLREF

GOK

D_OC

ON

VTEMP

IMON

CLREF

SS

CS

GND

VIN VINF

VDD

NCP81295

VOUT

GATE

SS

CS

GND

VIN VINF

GOK

D_OC

ON

VTEMP

IMON

CLREF

Figure 7. Application Schematic − Stand−alone Parallel EFuse

NCP81295

GND

VDD

VOUT

GATE

SS

CS

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6

VIN

VINF

VDD

9−16

7

21

VDD_UVR

5V

LDO

CHARGE

PUMP

VINF+2XVDD

EN

NCP81295, NCP81296

SENSEFET

1:5000

ISC

OUTPUT

MONITOR

VDD

VOUT > 90 % VIN VOUT > 80 % VIN

VOUT > 70 % VIN VOUT > 40 % VIN

500

PD

5 mA

25−32

-32

19

VOUT

SS

ON

VTEMP

GND

4

18

20

5

VDD

mA

V

VDD

V

SWON

SWOFF

VOUT>90 VOUT>70

DRAIN MON

GATE MON

50 mA

%VIN %VIN

DIE TEMP MONITOR

LOGIC

OVERCURRENT

TIMER

VCL_MAX

VCL_HI

VCL_LO

VOUT>80

VOUT>40

%VIN

A

IMON

A

CS

VOC_TH(85% CLREF)

VDD

10 mA

22

23

24

3

5

IMON

CS

CLREF

D_OC

GOK

Figure 8. Block Diagram

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NCP81295, NCP81296

Table 2. PIN DESCRIPTION

Pin No. Symbol Description

1 NC4 No electrical connection internally. May connect to any potential

2 NC5 No electrical connection internally. May connect to any potential

3 D_OC Overcurrent indicator output (open drain). Low indicates the NCP81295 is limiting current. The D_OC

4 ON Enable input and output pulldown resistance control.

5 GOK OK status indicator output (open drain). Low indicates that the NCP81295 was turned off by a fault.

6 NC1 Test pin. Do not connect to this pin. Leave floating

7 VINF

8 NC2 Internal FET sense pin. Do not connect to this pin. Leave floating

9 VIN09 Input of high current output switch

10 VIN10 Input of high current output switch

11 VIN11 Input of high current output switch

12 VIN12 Input of high current output switch

13 VIN13 Input of high current output switch

14 VIN14 Input of high current output switch

15 VIN15 Input of high current output switch

16 VIN16 Input of high current output switch

17 GATE Internal FET gate pin. Connect to the cathode of an anode grounded diode such as BAS16P2T5G. A

18 VTEMP Analog temperature monitor output.

19 SS Soft Start time programming pin. Connect a capacitor to this pin to set the softstart time.

20 GND Ground

21 VDD Linear regulator output

22 IMON Analog current monitor output

23 CS Current sense feedback output (current). Scaling the voltage developed at this pin with a resistor to

24 CLREF Current limit setpoint input for normal operation (after soft−start).

25 VOUT25 Output of high current output switch

26 VOUT26 Output of high current output switch

27 VOUT27 Output of high current output switch

28 VOUT28 Output of high current output switch

29 VOUT29 Output of high current output switch

30 VOUT30 Output of high current output switch

31 VOUT31 Output of high current output switch

32 VOUT32 Output of high current output switch

33 VIN33 Input of high current output switch

output does not report current limiting during soft−start.

Control circuit power supply input. Connect to VIN pins through an RC filter. (1 W / 0.1 mF)

4.7 nF ceramic capacitor is reserved between this pin and GND for NCP81295 to mitigate the oscillation risk when small amount of output capacitance (< 100 mF) or long input/output cable (large L L

) happens.

OUT

ground makes this also an input for several current limiting functions and overcurrent indicator D_OC.

/

IN

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