ST L9484 User Manual

L9484

Alternator voltage regulator

Features

■For air and liquid cooled applications

■Ambient air temperature (thermistor) compensated

■Special default compensation curve with TSterminal open

■Compensation curve with application specific resistor on TS

■Thermal protection

■Field driver, lamp driver, relay driver, and df (field monitor) short circuit protected

■Load response control

■Single phase autostart

Description

The L9484 is a monolithic multifunction alternator voltage regulator intended for use in automotive charging applications.

Table 1. Device summary

Multiiwatt8

L9484 regulates the output of an automotive generator by controlling the field winding current by means of a variable frequency PWM high side driver.

Order code	Package	Packing
L9484	Multiwatt8	Tube

November 2008

Rev 3

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www.st.com

			L9484
Contents
1	Pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .		. . . 3
2	Electrical specification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .		. . . 4
	2.1	Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	. . . 4
	2.2	Thermal data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	. . . 4
	2.3	Electrical characteristcs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	. . . 4
	2.4	Diagnostic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	. . . 7
	2.5	Fault indication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	. . . 7
	2.6	Regulation features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	. . . 7
3	Package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .		. . . 9
4	Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .		. . 10

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L9484

1 Pin description

Table 2.	Pin description
N #	Pin	Description
1	VGO	Generator output – voltage sense and power supply to ASVR
2	F+	Field driver - high side drive output
3	G	Ground for ASVR (must be connected for ground for ASVR)
4	TS	Thermistor sense terminal
		Internally connected to the tab or slug in MW-8. Shall not be used for ASVR
5	Gnd	ground, nor voltage applied to pin 5 to cause ≥ 50mV pin 5 to pin 3. May be
		unconnected or externally connected to pin 3.
6	DF	Inverted field monitor output
7	L	Lamp - low side driver; relay - high side driver
8	P	Phase sense input

Figure 1. Pin connection (top view)

8	P
7	L
6	DF
5	GND
4	TS
3	G
2	F+
1	VGO
Tab connected to pin 5	D02AT502

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L9484

2 Electrical specification

2.1Absolute maximum ratings

Table 3.	Absolute maximum ratings
Symbol	Parameter	Value	Unit
Io	Output current capability	Internally limited	A
Ptot	Power dissipation	6	W
	Short circuit protected	All terminal, to VGO
		and ground

2.2Thermal data

Table 4.	Thermal data
Symbol	Parameter	Value	Unit
Tj	Junction temperature	-40 to +150	°C
Tstg	Storage temperature	-50 to +150	°C
Tsd	Thermal shut-down	175 ± 15	°C
Rth j-case	Thermal resistance junction to case	1.5	°C/W

2.3Electrical characteristcs

	Table 5.	Electrical characteristcs
		(Tcase = -35°C to +150°C continuous unless otherwise specified)
	Symbol	Parameter	Test condition	Min.	Typ.	Max.	Unit
	VOS	Operating supply voltage	Tcase = +25°C to =150°C	8		Vov	V
	VOS	Operating supply voltage	Tcase = -40°C to +25°C	10		Vov	V
			VGO = 12.6V; Tcase = 25°C;
	ISB	Stand-by current	10kΩ VGO to TS; F+, G & tab				μA
			(slug) grounded; L, DF, & P			300
			unconnected; regulator not
			activated.
	VSP	Regulator set-point	10kΩ between VGO and TS	Curve shown in Figure 3
			NTC thermistor with R25°C =	Curves shown in Figure 4
	VSP	Regulator set-point		(with MURATA NTC
			10kΩ; Tj = 90°C
					NTH4G39A1)
	VNB	Generator output, no	No battery, IOUT = 2A to 50%	VSP -		VSP +	V
		battery	max. load	2		2
	TC	Thermal compensation	voltage @ VGO	Curves shown in Figure 3
					and Figure 4

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