ST L9484 User Manual
Features
■ For air and liquid cooled applications
■ Ambient air temperature (thermistor)
compensated
■ Special default compensation curve with TS-
terminal 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
L9484
Alternator voltage regulator
Multiiwatt8
Description
The L9484 is a monolithic multifunction alternator
voltage regulator intended for use in automotive
charging applications.
Table 1. Device summary
Order code Package Packing
L9484 Multiwatt8 Tube
L9484 regulates the output of an automotive
generator by controlling the field winding current
by means of a variable frequency PWM high side
driver.
November 2008 Rev 3 1/11
www.st.com
11
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
2/11
L9484
1 Pin description
Table 2. Pin description
N # Pin Description
1V
Generator output – voltage sense and power supply to ASVR
GO
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
5Gnd
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
7
6
5
4
3
2
1
P
L
DF
GND
TS
G
F+
V
GO
Tab connected to pin 5
D02AT502
3/11
2 Electrical specification
2.1 Absolute maximum ratings
Table 3. Absolute maximum ratings
Symbol Parameter Value Unit
I
Output current capability Internally limited A
o
P
2.2 Thermal data
Table 4. Thermal data
Symbol Parameter Value Unit
T
T
R
th j-case
Power dissipation 6 W
tot
Short circuit protected
T
Junction temperature -40 to +150 °C
j
Storage temperature -50 to +150 °C
stg
Thermal shut-down 175 ± 15 °C
sd
Thermal resistance junction to case 1.5 °C/W
L9484
All terminal, to VGO
and ground
2.3 Electrical characteristcs
Table 5. Electrical characteristcs
(T
= -35°C to +150°C continuous unless otherwise specified)
case
Symbol Parameter Test condition Min. Typ. Max. Unit
V
V
V
V
V
Operating supply voltage T
OS
Operating supply voltage T
OS
I
Stand-by current
SB
Regulator set-point 10kΩ between VGO and TS Curve shown in Figure 3
SP
Regulator set-point
SP
Generator output, no
NB
battery
T
Thermal compensation voltage @ VGO
C
= +25°C to =150°C8 VovV
case
= -40°C to +25°C10 VovV
case
V
= 12.6V; T
GO
10kΩ V
to TS; F+, G & tab
GO
(slug) grounded; L, DF, & P
case
= 25°C;
300 μA
unconnected; regulator not
activated.
NTC thermistor with R
10kΩ; Tj = 90°C
No battery, I
= 2A to 50%
OUT
max. load
25°C
Curves shown in Figure 4
=
(with MURATA NTC
NTH4G39A1)
VSP -
2
VSP +
2
Curves shown in Figure 3
and Figure 4
V
4/11
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