The L9473 is a monolithic multifunction generator
Voltage regulator intended for use in automotive
charging applications.
Table 1.Device summary
Order codePackagePacking
L9473JMultiwatt8Tube
This All Silicon Voltage Regulator regulates the
output of an automotive generator by controlling
the field winding current by means of a variable
frequency PWM high side driver.
3GGround for ASVR (Must be connected for Ground for ASVR)
4TSThermistor Sense Terminal
5GND
6DFInverted Field Monitor Output
7LLamp - Low Side Driver; Relay - High Side Driver
8PPhase Sense Input
Generator Output – Voltage Sense and Power Supply to ASVR
GO
Internally connected to the Tab or Slug in MW-8. Shall not be used for ASVR
Ground, nor voltage applied to Pin 5 to cause ≥ 50mV Pin 5 to Pin 3. May be
unconnected or externally connected to Pin 3.
4
1
8
2
3
Figure 2.Pin connection (top view)
Tab connected to pin 5
8
7
6
5
4
3
2
1
D02AT502
P
L
DF
GND
TS
G
F+
V
GO
3/10
Electrical specificationsL9473
2 Electrical specifications
2.1 Absolute maximum ratings
Table 3.Absolute maximum ratings
SymbolParameterValueUnit
I
OC
P
Output current capabilityInternally limitedA
Power dissipation 6W
tot
Short circuit protected
All terminal, to VGO
and GND
2.2 Thermal data
Table 4.Thermal data
SymbolParameterValueUnit
T
T
T
R
th j-case
Junction temperature-40 to +150°C
j
Storage temperature-50 to +150°C
stg
Thermal shut-down175 ± 15°C
sd
Thermal resistance junction to case1.5°C/W
2.3 Electrical characteristcs
Table 5.Electrical characteristcs
SymbolParameterTest conditionMin. Typ.Max.Unit
(T
= -35°C to +150°C continuous unless otherwise specified)
case
T
= +25°C to =150°C8 VovV
V
I
Operating supply voltage
OS
Standby current
SB
case
T
= -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
unconnected; Regulator NOT
Activated.
10kΩ between V
V
Regulator set-point
SP
NTC thermistor with R
10kΩ; Tj = 90°C
V
V
Generator output, no battery
NB
T
Thermal compensationVoltage @ VGO Curves shown in Figure 4 and 5
C
Load regulation6500 grpm, 10% to 95% load300mV
LR
No battery, I
Max. Load
4/10
= 25°C;
case
and TSCurve shown in Figure 3
GO
25°C
=
Curves shown in Figure 4
(with MURATA NTC NTH4G39A1)
= 2A to 50%
OUT
V
- 2
SP
300μA
+
V
SP
2
V
L9473Electrical specifications
Table 5.Electrical characteristcs (continued)
(T
= -35°C to +150°C continuous unless otherwise specified)
case
SymbolParameterTest conditionMin. Typ.Max.Unit
V
V
F-ON
V
F-ON
I
F-LIM
I
F-LIM
I
G-MIN
V
I
F
V
I
DF-LK
F
TURBO
1. The Field Drive capability shall not decrease as a function of temperature between 25°C and 150°C, at a rate faster than -
0.024A/°C (for example, Field Drive shall be capable of ≥7.2A at 100°C).
Speed regulation15A load, 2000 to 20,000 grpm100mV
Internal clock frequencyVDF = 32 - 35V; at 2.2kΩ4XHz
750mV
850mV
Figure 3.Set-point voltage vs. mounting tab temperature
(10kΩ between V
15.4
15.4
15.3
15.3
15.17
15.17
15.2
15.2
15
15
15.01
15.01
14.8
14.8
14.84
14.84
Volts
Volts
14.6
14.6
14.4
14.4
14.2
14.2
-40-20020406080100120
-40-20020406080100120
and TS)
GO
15.08
15.08
14.86
14.86
14.69
14.69
Junction Temp
Junction Temp
14.77
14.77
14.59
14.59
14.41
14.41
14.3
14.3
5/10
Electrical specificationsL9473
Figure 4.Set-point voltage vs. thermistor temperature, Tj = 90°C
(Not guaranteed by testing, depending on NTC characteristics)
15.2
15.04
15
14.8
14.73
14.6
14.4
Volts
14.2
14
13.8
13.6
13.4
-40-200204060801 00120
14.88
14.49
13.91
13.53
NTC Temp
Figure 5.Set-point voltages vs. mounting tab temperature (TS-Open)
15.0
15.0
14.8
14.8
14.73
14.73
14.6
14.6
14.4
14.4
14.2
14.2
14.12
14.12
14.0
14.0
13.8
13.8
Set Voltage
Set Voltage
13.6
13.6
13.4
13.4
13.2
13.2
13.0
13.0
-40 -20020406080 100 120 140 160
-40 -20020406080 100 120 140 160
14.63
14.63
14.00
14.00
Temp
Temp
14.43
14.43
13.78
13.78
Table 6.Diagnostic
(T
= -35°C to +150°C unless otherwise specified)
case
SymbolParameterConditionsMin. Typ.Max.Units
+
V
SP
V
OV
V
UV
V
L-SAT
V
L-SAT-BO
V
L-RLY
T
DELAY
Over voltageVSP + 1
F
> F
Under voltage
P
S_term and V
Lamp ON saturation voltageIL = 0.5A (sinked by ASVR)>V
Lamp ON voltage
(1)
Lamp OFF (Relay Drive)
saturation voltage (vs. B+)
IL < 0.5A, VGO = Open; T
-35°C to 85°C
IL = 750mA (Sourced by ASVR)
(2)
T
case
, 10kohm between
P-LRC
GO
< 125°C
case
10.9511.8V
L-ACT
1.331.45V
=
Fault Indication Delay TimeDelay before Lamp ON0.91.11.3s
V
+ 2V
1.3
SP
3.85V
1.85V
1. This condition can happen when the connection between the battery and VGO or the output terminal of the generator is
broken. The 1.1 second delay is not required, and current is sinked by ASVR.
2. When no fault is detected the Lamp terminal is pulled up by ASVR.
6/10
L9473Electrical specifications
Table 7.Fault indication
ConditionsTDelay?
Table 8.
Initial KEY-ON Bulb and Wiring Check (Lamp ON for 1 sec ± 15% after initial KEYON)
VGO > V
V
F
No connection between battery and V
At start: Lamp ON until F
Regulation characteristics
P
P
< V
< F
P-F
P-TR
OV
AND VGO < V
@ V
P-TR
SP
P>FP-IR
GO
AND VP>V
. i.e. until VP reaches 8V.No
P-F
No
Ye s
Ye s
Ye s
No
SymbolParameterConditionsMin.Typ.Max.Unit
V
I
V
F
F
L-PD
P-TR
L terminal regulator activate
L-PD
threshold
L terminal pull down current
Initiate regulation phase voltage
P-IR
threshold
I
Phase terminal current sink
P
Initiate regulation phase
P-IR
frequency
Terminate regulation phase
frequency
IRDInitiate regulation delay
VGO=12.6V0.811.15V
VL = V
VGO=12.6V
L-ACT
0.090.78mA
Regulator Activated1.11.31.5V
VP > 1.5V and < 12.6V
VGO = 12.6V
0.253.5mA
123145167Hz
597286Hz
Regulator Activated, V
F
Conditions Met First Time.
P-IR
P-IR
AND
2.533.5s
Regulator Activated AND
FSDCField strobe duty cycle
(Regulation Terminated OR
1618.7522%
Regulation NOT Initiated)
LRCLoad response control rateField Drive Duty Cycle Increase8.51011.5%/s
F
P-LRC
SSSoft-start
LRC transition frequencyLRC Enabled if FP < F
LRC enabled until V
SP
regardless other conditions
P-LRC
reached
255300345Hz
344046%/s
7/10
Package informationL9473
3 Package information
In order to meet environmental requirements, ST (also) offers these devices in ECOPACK®
packages. ECOPACK
®
packages are lead-free. The category of second Level Interconnect
is marked on the package and on the inner box label, in compliance with JEDEC Standard
JESD97. The maximum ratings related to soldering conditions are also marked on the inner
box label.
ECOPACK is an ST trademark. ECOPACK specifications are available at: www.st.com.
Figure 6.Multiwatt8 mechanical data and package dimensions
DIM.
A50.197
B2.650.104
C1.60.063
E0.490.55 0.0190.022
F0.780.85 0.0300.033
G2.40 2.54 2.68 0.094 0.10 0.1 05
G1 17.64 17.78 17.92 0.690.70 0. 71
H119.60.772
H220.20.795
L20.3520.65 0.800.81
L217.05 17.20 17.35 0.67 0.68 0.68
L317.25 17.5 17.75 0.679 0.689 0.699
L410.3 10.710.9 0.406 0.421 0.429
L72.652.9 0.1040.114
S1.92.6 0.0750.102
S11.92.60.0750.1 02
U0.400.55 0.0150.022
Z0.700.85 0.0280.034
Dia1 3.653.85 0.1440.152
mminch
MIN. TYP. MAX. MIN. TYP. MAX.
OUTLINE AND
MECHANICAL DATA
Multiwatt8 (Pin 5 GND)
8/10
0043696 F
L9473Revision history
4 Revision history
Table 9.Document revision history
DateRevisionChanges
20-May-19941Initial release.
24-Oct-20082
Document reformatted.
"Added ECOPACK mention" in Section 3: Package information.
9/10
L9473
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