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 RSENSE Required

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

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

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MARKING

DIAGRAM

		1
		NCP8129x
1	32	AWLYYWWG
LQFN32 5x5, 0.5P		G
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

= (may or may not be present)

(Note: Microdot may be in either location)

			PINOUT
<![if ! IE]> <![endif]>32	<![if ! IE]> <![endif]>31	<![if ! IE]> <![endif]>30	<![if ! IE]> <![endif]>29	<![if ! IE]> <![endif]>28	<![if ! IE]> <![endif]>27	<![if ! IE]> <![endif]>26	<![if ! IE]> <![endif]>25
1							24
2							23
3		NCP81295/6					22
4		(TOP VIEW)					21
5							20
6				33			19
			VIN
7							18
8							17
<![if ! IE]> <![endif]>9	<![if ! IE]> <![endif]>10	<![if ! IE]> <![endif]>11	<![if ! IE]> <![endif]>12	<![if ! IE]> <![endif]>13	<![if ! IE]> <![endif]>14	<![if ! IE]> <![endif]>15	<![if ! IE]> <![endif]>16

For more details see Figure 1.

ORDERING INFORMATION

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

♥ Semiconductor Components Industries, LLC, 2017	1	Publication Order Number:
April, 2020 − Rev. 12		NCP81295/D

			NCP81295, NCP81296
	<![if ! IE]> <![endif]>VOUT32	<![if ! IE]> <![endif]>VOUT31	<![if ! IE]> <![endif]>VOUT30	<![if ! IE]> <![endif]>VOUT29	<![if ! IE]> <![endif]>VOUT28	<![if ! IE]> <![endif]>VOUT27	<![if ! IE]> <![endif]>VOUT26	<![if ! IE]> <![endif]>VOUT25
	<![if ! IE]> <![endif]>32	<![if ! IE]> <![endif]>31	<![if ! IE]> <![endif]>30	<![if ! IE]> <![endif]>29	<![if ! IE]> <![endif]>28	<![if ! IE]> <![endif]>27	<![if ! IE]> <![endif]>26	<![if ! IE]> <![endif]>25
NC4	1							24	CLREF
NC5	2							23	CS
D_OC	3							22	IMON
				NCP81295 /6
ON	4			(TOP VIEW)				21	VDD
GOK	5				33			20	GND
					VIN
NC1	6							19	SS
VINF	7							18	VTEMP
NC2	8							17	GATE
	<![if ! IE]> <![endif]>9	<![if ! IE]> <![endif]>10	<![if ! IE]> <![endif]>11	<![if ! IE]> <![endif]>12	<![if ! IE]> <![endif]>13	<![if ! IE]> <![endif]>14	<![if ! IE]> <![endif]>15	<![if ! IE]> <![endif]>16
	<![if ! IE]> <![endif]>VIN9	<![if ! IE]> <![endif]>VIN10	<![if ! IE]> <![endif]>VIN11	<![if ! IE]> <![endif]>VIN12	<![if ! IE]> <![endif]>VIN13	<![if ! IE]> <![endif]>VIN14	<![if ! IE]> <![endif]>VIN15	<![if ! IE]> <![endif]>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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NCP81295, NCP81296

System VIN

	VIN	VINF
GOK			VDD
D_OC
ON			VOUT	Fuse−protected
	NCP81295/ 6			System VIN
VTEMP
IMON
GATE			CS
CLREF			SS
		GND

Figure 2. Typical Application

			Main
			System
Input	Main Efuse		Power
Voltage				Main System
	Main Efuse
	E−Fuse	E−Fuse
		Control/
	Control/
		Monitor
	Monitor
			PMBSUS Control and
	mController		Monitor
	E−Fuse
	IMON		Standby
			System	Standby
			Power
	Standby Efuse			System
	E−Fuse
	Control/
	Monitor

Figure 3. Typical Application Diagram

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NCP81295, NCP81296

System VIN

mController	VIN		VINF
FAULT IN	GOK		VDD
OVERCURRENT IN	D_OC	NCP81295		Fuse−protected
ENABLE OUT	ON			System VIN
			VOUT
TEMP MONITOR A/D IN	VTEMP		GATE
CURRENT MONITOR A/D IN	IMON		SS
CURRENT LIMIT D/A OUT	CLREF	GND	CS
	VIN		VINF
	GOK		VDD
	D_OC	NCP81295
	ON		VOUT
	VTEMP		GATE
	IMON		SS
	CLREF	GND	CS
	VIN		VINF
	GOK		VDD
	D_OC	NCP81295
	ON		VOUT
	VTEMP		GATE
	IMON		SS
	CLREF	GND	CS

Figure 4. Application Schematic − Parallel Fuse Operation with Controller

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NCP81295, NCP81296

mController

FAULT IN OVERCURRENT IN ENABLE OUT TEMP MONITOR A/D IN

CURRENT LIMIT D/A OUT CURRENT MONITOR A/D IN

System VIN

	VIN	VINF
	GOK	VDD
	D_OC	GATE
	ON NCP81295/6		Fuse Protected
	VTEMP	VOUT
			System VIN
	CLREF	CS
	IMON	SS
	GND

Figure 5. Application Schematic − Single EFuse with Controller

System VIN

VIN	VINF
GOK	VDD
D_OC	GATE

ON NCP81295/6

VTEMP	VOUT
CLREF	CS
IMON	SS
GND

Fuse Protected

System VIN

Figure 6. Application Schematic − Stand−alone Single EFuse

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NCP81295, NCP81296

System VIN

VIN		VINF
GOK		VDD
D_OC	NCP81295		Fuse−protected
ON			System VIN
		VOUT
VTEMP		GATE
IMON		SS
CLREF	GND	CS
VIN		VINF
GOK		VDD
D_OC	NCP81295
ON		VOUT
VTEMP		GATE
IMON		SS
CLREF	GND	CS
VIN		VINF
GOK		VDD
D_OC	NCP81295
ON		VOUT
VTEMP		GATE
IMON		SS
CLREF	GND	CS

Figure 7. Application Schematic − Stand−alone Parallel EFuse

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			NCP81295, NCP81296
VIN 9−16					VOUT > 90 % VIN
			SENSEFET	OUTPUT	VOUT > 80 % VIN
			1:5000
				MONITOR VOUT > 70 % VIN
VINF	7				VOUT > 40 % VIN
		5V	CHARGE
			PUMP
		LDO
VDD	21		VINF+2XVDD		25−-32 VOUT
			EN		500
				VDD
		VDD_UVR			PD
					5 mA
					19	SS
			ISC

		VDD			AIMON	22	IMON
	5mA		VOUT>90%VIN		ACS	23	CS
			VOUT>70%VIN
						VDD
			DRAIN MON
ON	4		GATE MON
						10 mA
					OVERCURRENT
						24	CLREF
		VSWON			TIMER
						3	D_OC
		VSWOFF			VCL_MAX
				LOGIC	VCL_HI
		VDD
			DIE TEMP		VCL_LO
			MONITOR
					VOC_TH(85% CLREF)
					VOUT>80%VIN
					VOUT>40%VIN
VTEMP 18						5	GOK
			50 mA
GND	20

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
			output does not report current limiting during soft−start.
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		Control circuit power supply input. Connect to VIN pins through an RC filter. (1 W / 0.1 mF)
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
			4.7 nF ceramic capacitor is reserved between this pin and GND for NCP81295 to mitigate the oscilla-
			tion risk when small amount of output capacitance (< 100 mF) or long input/output cable (large LIN /
			LOUT) happens.
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
			ground makes this also an input for several current limiting functions and overcurrent indicator D_OC.
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

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