ST L6370 User Manual

L6370

2.5 A high-side driver industrial intelligent power switch

Features

■2.5 A output current

■9.5 V to 35 V supply voltage range

■Internal current limiting

■Thermal shutdown

■Open ground protection

■Internal negative voltage clamping to VS - 50 V for fast demagnetization

■Differential inputs with large common mode range and threshold hysteresis

■Undervoltage lockout with hysteresis

■Open load detection

■Two diagnostic outputs

■Output status led driver

■Non dissipative short circuit protection

■Protection against and surge transient (IEC 61000-4-5)

■Immunity against burst transient (IEC 61000-4- 4)

■ESD protection (human body model ±2kV)

PowerSO-20

Description

The L6370 is a monolithic intelligent power switch in Multipower-BCD Technology, for driving inductive or resistive loads. An internal clamping diode enables the fast demagnetization of inductive loads. Diagnostic for CPU feedback and extensive use of electrical protections make this device extremely rugged and specially suitable for industrial automation applications.

Table 1.	Device summary
Part number		Op. temp. range, °C	Package	Packaging
	L6370D	-25 to +85	PowerSO-20	Tube
L6370D013TR		-25 to +85	PowerSO-20	Tape and reel

July 2010

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Contents	L6370

Contents

1	Block diagram and pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . .		3
	1.1	Pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	4
2	Electrical specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .		5
	2.1	Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	5
	2.2	Thermal data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	5
	2.3	Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	6
	2.4	AC operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	7
3	Circuit description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .		8

3.1 Diagnostic truth table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 3.2 Input section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 3.3 Diagnostic logic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 3.4 Short circuit operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 3.5 Overtemperature protection (OVT) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 3.6 Undervoltage protection (UV) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 3.7 Demagnetization of inductive loads . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

4	Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .		12
	4.1	PowerSO-20 mechanical data and package dimensions . . . . . . . . . . . . .	13
	4.2	PowerSO-20 packing information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	14
5	Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .		17

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L6370	Block diagram and pin description

1 Block diagram and pin description

Figure 1. Block diagram

					VS
		UNDER		CHARGE
		VOLTAGE		PUMP
IN+	INPUT
	+
IN-	-			DRIVER
	1.4V				OUT
	NON DISSIPATIVE			CURRENT
	SHORT CIRCUIT			LIMITATION	RSC
ON-DELAY	OSC			OPEN LOAD
				DETECTION
	OUTSTATUS				DIAG1
	THERMAL			DIAGNOSTIC
	PROTECTION
					DIAG2
		3mA
	OUTPUT STATUS				D95IN208D
Figure 2. Pin connection (top view)
	GND	1	20	GND
	OUTPUT	2	19	OUTPUT STATUS
	OUTPUT	3	18	INPUT -
	ON-DELAY	4	17	INPUT +	PowerSO-20
	SUPPLY VOLTAGE	5	16	N.C.
	SUPPLY VOLTAGE	6	15	DIAGNOSTIC 2
	N.C.	7	14	DIAGNOSTIC 1
	OUTPUT	8	13	RSC
	OUTPUT	9	12	N.C.
	GND	10	11	GND
				D95IN210B

Note: Output pins must be connected externally to the package to use all leads for the output current (Pin 2, 3, 8 and 9 for PowerSO20 package).

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Block diagram and pin description	L6370

1.1Pin description

	Table 2.	Pin description
	Pin N°	Pin name	Function
	14	DIAG1	DIAGNOSTIC 1 output. This open drain reports the IC working
			conditions. (See diagnostic truth Table 7)
	15	DIAG2	DIAGNOSTIC 2 output. This open drain reports the IC working
			conditions. (See diagnostic truth Table 7)
	18	IN-	Comparator non inverting input
	17	IN+	Comparator inverting input
			This current source output is capable of driving a LED to signal the
	19	OUTSTATUS	status of the output pin. The pin is active (source current) when the
			output pin is considered high (See Figure 3)
	1, 10,	GND	Ground
	11, 20
	4	ON-DELAY	Programmable ON time interval duration during short circuit operation
	13	RSC	Current limitation setting.
	8, 9	OUTPUT	High side output with built-in current limitation
	5, 6	VS	Supply Voltage Input, the value of the supply voltage is monitored to
			detect under voltage condition

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L6370	Electrical specifications

2 Electrical specifications

2.1Absolute maximum ratings

	Table 3.	Absolute maximum ratings
	Symbol	Parameter	Value	Unit
	VS	Supply voltage (TW< 10ms)	50	V
	VS– VO	Supply to output differential voltage.	internally limited	V
		See also VCl
	Vod	Externally forced voltage	-0.3 to 7	V
	Iod	Externally forced current	±1	mA
	Vi	Input voltage	-10 to VS+10	V
	Vi	Differential input voltage	43	V
	Ii	Input current	20	mA
	IO	Output current. see also ISC	internally limited	A
	PTOT	Power dissipation.	internally limited	W
		see also thermal characteristics.
	TOP	Operating temperature range (Tamb)	-25 to +85	°C
	TSTG	Storage temperature	-55 to 150	°C
	EI	Energy induct. load TJ= 85°C	1	J

2.2Thermal data

	Table 4.	Thermal data
	Symbol	Description		Value	Unit
	RthJC	Thermal resistance junction to case	Max.	1.5	°C/W
	RthJA	Thermal resistance junction to ambient	Max.	-

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Electrical specifications	L6370

2.3Electrical characteristics

	(VS = 24V; TJ = –25 to +125°C, unless otherwise specified)
Table 5.	Electrical characteristics
Symbol	Parameter	Test condition			Min.		Typ.		Max.	Unit
Vsmin	Supply voltage for valid	Idiag> 0.5mA; Vdg1= 1.5V			4				35	V
	diagnostics
Vs	Supply voltage (operative)				9.5		24		35	V
Iq	Quiescent current	Vil					0.8		1.4	mA
	Iout = Ios = 0	Vih					3		4
Vsth1	Undervoltage threshold 1	(See Figure 4), Tamb = 0 to			8.5		9		9.5	V
		+85°C
Vsth2	Undervoltage threshold 2				8		8.5		9	V
Vsth3	Supply voltage hysteresis				300		500		700	mV
		VS = 9.5 to 35V; RL= 2Ω 5kΩ<				15/RSC(kΩ)				A
Isc	Short circuit current	RSC< 30kΩ
		0< RSC< 5kΩ			2.6		3.2		4	A
		Iout = 2.0A, Tj = 25°C					200		280	mV
		Tj = 125°C					320		440
Vdon	Output voltage drop
		Iout = 2.5A, Tj = 25°C					250		350	mV
		Tj = 125°C					400		550
Ioslk	Output leakage current	Vi = Vil; Vo = 0V							500	μA
Vol	Low state out voltage	Vi = Vil; RL = ∞					0.8		1.5	V
Vcl	Internal voltage clamp	IO = 1A			48		53		58	V
	(VS- VO)	Single pulsed: Tp = 300 μs
Iold	Open load detection current	Vi = Vih; Tamb = 0 to +85 °C			1		3		6	mA
Vid	Common mode input voltage	VS = 18 to 35V			-7				15	V
	range (operative)
Iib	Input bias current	Vi = -7 to 15V; -In = 0V			-250				250	μA
Vith	Input threshold voltage	V +In > V -In			0.8		1.4		2	V
Viths	Input threshold hysteresis	V +In > V -In			50				400	mV
	voltage
Rid	Diff. input resistance	0 < +In < +16V; -In = 0V					400			KΩ
		-7 < +In < 0V; -In = 0V					150
		V +In = V -In	+Ii		-20				+20
		0V < Vi < 5.5V	-Ii		-75		-25
Iilk	Input offset current	-In = GND	+Ii				+10		+50	μA
		0V < V+In <5.5V	-Ii		-250		-125
		+In = GND	+Ii		-100		-30
		0V < V-In <5.5V	-Ii		-50		-15

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