L9911 (ST Microelectronics)
CAR ALTERNATOR MULTIFUNCTION SMART VOLTAGE REGULATOR

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L9911
CAR ALTERNATOR MULTIFUNCTION SMART VOLTAGE
REGULATOR
PRELIMINARY DATA
1 Features
FULLY MONOLITHIC DESIGN
HIGH SIDE FIELD DRIVER
THERMAL PROTECTION
FIELD SHORT CIRCUIT PROTECTION
PROTECTED DIAGNOSTIC LAMP DRIVER
PROTECTED HIGH SIDE RELAY DRIVER
COMPLEX DIAGNOSTICS
LOAD RESPONSE CONTROL
DFM OUTPUT (FIELD MONITOR)
2 Description
The L9911 is a monolithic multifunction alternator
voltage regulator intended for use in automotive
application. It includes the control section, the field
power stage, fault diagnostic circuit which drives a
warning lamp, and the protection against short cir-
cuits.
3 Circuit Operation
The alternator's voltage regulator performs the fol-
lowing main functions:
– 1) voltage regulation
– 2) protection
– 3) control fault diagnosis
– 4) load response control
Figure 1. Package
Multiwatt8
Table 1. Order Codes
Part Number
L9911A
L9911B
Package
Multiwatt8
Multiwatt8
Features
See Table.9
See Table.9
ance so high to cause a superimposed ripple on
the alternator voltage higher than 5-6V. Conse-
quently it doesn't need, in the standard applica-
tion, any external component. Anyway an external
capacitor (2.2µF) must be inserted between A+
and ground when using the device with very long
cables.
3.2 PROTECTION
It is present a protection against short circuits of
the lamp and the relay power drivers (L) and of the
field power driver (F+), a thermal drivers shutdown
protection and an overvoltage protection of L pow-
er drivers.
3.1 VOLTAGE REGULATION
The alternator voltage is compared with a refer-
ence voltage in an amplifier, whose output deter-
mines the switching frequency of output power
MOS whose current excites the coil of the alterna-
tor; as the regulator is in fixed-frequency topology,
the field switching frequency does not depend on
the alternator characteristics. The regulators have
an integrated filter in the voltage sensing path
guaranteeing the correct behaviour of the devices
also when the rectifier diodes feature very high
suwsaitgcehwionwfgthwsep.idDkeeavsit.caeTShaelhsoeinweteittr4hnUavle.rfciyltoelomrninggcaalblolewsscothne-
necting the alternator to the battery with an imped-
3.3 DIAGNOSIS
The circuit detects fault conditions related to the
phase and F+ status and receives informations
from one of the three alternator phases. In order to
prevent spurious indications, fault warnings are
not displayed immediately but are dalayed by a
fixed time.
3.4 LOAD RESPONSE CONTROL
The internal circuit regulates the soft start charac-
teristics (activated always at engine start) and the
soft attack characteristics.
November 2005
Rev. 3
1/15
This is preliminary information on a new product now in development or undergoing evaluation. Details are subject to change without notice.


L9911 (ST Microelectronics)
CAR ALTERNATOR MULTIFUNCTION SMART VOLTAGE REGULATOR

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Figure 2. Pin Connection (Top view)
12 3456 78
P
GND-case
L F+ B+
Table 2. Pin Descriptions
N° Pin
Function
1 P Phase sense input.
2
DFM
Field monitor output.
3
RES.
Reserved.
4 L Lamp terminal low side driver; relay terminal high side driver.
5 GND-case Ground.
6
RES.
Reserved.
7 F+ High side driver output.
8 B+ Sensed power supply.
Table 3. Absolute Maximum Ratings (Tj = -40 to 150°C, unless otherwise specified)
Symbol
VS
Tj
Tstg, Tcase
Ptot
Parameter
DC Supply Voltage (2 min. @ 25°C)
Transient Supply Voltage (load dump) [see application circuit]
t<500ms
Transient Supply Voltage (low energy spikes) [see application
circuit] ISO7637-1 pulse 1,2,3 /ISO7637-3
Junction temperature range
Storage and case temperature range
Total power Dissipation (@ Tcase 150°C, Ifield 5A)
Reverse Battery Voltage (see application diagram) @ 25°C, T =
15 sec
Normal working condition reverse voltage (P vs. GROUND)
DC Pin Current on F+, B+, GND (bonding limitation)
ESD Voltage MILSTD883C (All pins vs.GND)
Value
24
40
60
-40 to 150
-40 to 150
4
-2.5
-1.5
15
±4
Table 4. Thermal Data
Symbol
Parameter
Rth jw-cawsew.DThaertmaaSl rheseisetatn4cUe j.ucnoctmion to case
Value
1.5
Unit
V
V
V
°C
°C
W
V
V
A
KV
Unit
°C/W
2/15


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L9911
Table 5. ELECTRICAL CHARACTERISTCS
(Tj = -40°C to 150°C; unless otherwise specified)
Symbol
Parameter
Test Condition
Vbat Operating Supply Voltage
Ib-sinked Supply Battery Current
Ib-stby Stand-by Current
B+ = 12.5V, F+ = 0V
Vreg 1
Vreg 2
Vreg 3
Regulated Voltage & Thermal
Drift.
3 configurations available,
selectable by mask option
(see Table.8).
Ialt=1A-0.9*Inom; Tcase=20ºC;
1400<rpm<RPMMAX (Fig. 3)
Ialt=10A; Tcase=23ºC;
rpm=6000rpm;15V max (Fig. 4)
Ialt=10A; Tcase=23ºC;
rpm=6000rpm (Fig. 5)
Delta
Vrpm
1400<rpm<RPMMAX; Ialt=10A
Delta
Vload
5A<Ialt<Inom; rpm=6000rpm
Vreg-less Reg. Voltage without Battery Ialt = 3A resistive; Tcase=25º;
2000<rpm<RPMMAX
Vov-p Overvoltage protection
threshold
Voltage on pin
B+ to disable L
drivers
High and low
side driver off
Vov-d Overvoltage diagnosis
threshold
VB+ to turn on L low side driver at
VF+ > VS1
Tj-sd
Thermal shutdown threshold Temperature to disable F+, DFM, L
(high & low side drivers)
Tj-sd-dwn Thermal Shut-down
hysteresis
L/F+/DFM from OFF STATE (due to
thermal shutdown) to ON STATE
Vuv-1 Under voltage diagnosis
threshold
VB+ to turn on L low side driver
Vuv-up
VB+ to turn off L low side driver
VF+_sat Field driver saturation voltage Tj = 150ºC; I = 4.5A
Tj = 25ºC; I = 7A
Vf Freewheeling diode F+
I=5A
If_SCTH Field short circuit driver
protection threshold current
(see fig. 16
F+ = 0V; Tj = -40ºC
F+ = 0V; Tj = -25ºC
F+ = 0V; Tj = -150ºC
Vs1 Field driver ON-state
detection
f-pre Pre-excitation frequency
Duty-pre Pre-excitation Field driver
ON-duty
t-rise Output Voltage Rise Time Ifield = 3A resistive (Fig. 7)
t_fall Output Voltage Fall Time
Ifield = 3A resistive (Fig. 7)
Fsw_F+ Field switching frequency
Ialt=1A~0.9*Inom;1400rpm<rpm<R
PMMAX
If_lewakww.ODutaputat FSiehldeDerivt4erULe.ackoamge B+ = 24V; VF+ = 0
Current
Min.
7
14.0
-4.5
14.35
-11.8
14.35
-6
Typ.
14.4
-3.5
14.5
-10
14.5
-4
Max.
18
25
500
14.8
-2.5
14.65
-8.2
14.65
-2
200
Unit
V
mA
µA
V
mV/°C
V
mV/°C
V
mV/°C
mV
250 mV
12 16 V
18 22 V
Vreg -
5%
160
Vreg
175
Vreg +
5%
190
V
ºC
Tj-sd-
10
7.7
Tj-sd-2
8.6 9.5
ºC
V
Vuv +
0.40
11
8.5
5.5
4.5
Vuv +
0.50
Vuv +
0.60
0.6
0.55
2
18
18
18
5.5
V
V
V
V
A
A
A
V
283 333 383
15.93 18.75 21.57
Hz
%
10 50 µs
10 50 µs
250 400 Hz
10 µA
3/15


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Table 5. ELECTRICAL CHARACTERISTCS (continued)
(Tj = -40°C to 150°C; unless otherwise specified)
Symbol
Parameter
Test Condition
DUTY-PR Phase regulation max field
ON duty
Fig. 8
VH_SAT High Side Driver Saturation With driver Isource=500mA
Voltage (Fig. 10)
VL_SAT Low Side Driver Saturation With driver Isink=500mA
Voltage (Fig. 10)
VLSB Selfbias without supply Lamp B+ open; L connected to 12V
driver Voltage
through a 50 Ohm resistor
IHSC
High Side Driver short circuit B+ = 12.5V; L = GND
current protection
ILSC
Low Side Driver short circuit B+ = L = 12.5V
current (see fig. 16)
VthL
Enable Regulator Supply
Voltage Threshold
Ipd_L
L terminal Pull-down Current VL = 0.6V
when the generator is not
rotating
I_L_sink L sink current when the
generator is rotating
P frequency 500Hz; VB+ = 12V
t-D Diagnostic Alarm Delay Time
Vcan-DFM Test mode to cancel soft
start/ attack (voltage)
(Fig. 11)
tcan-DFM Test mode delay time
(Fig. 11)
VPHL1 Enable control voltage input square wave f = 1KHz
high threshold
VPHL2 Enable control voltage input square wave f = 1KHz
low threshold
t_PHL1 Enable Control Voltage
Phase Filtering Time
VPHH1 Diagnosis phase loss input
high threshold
VPHH2_1 Diagnosis phase loss input
low threshold
tPHd
Diagnostic Phase Filtering
Time
I_Pd-P1 Phase Pull-down Current
VP = 0.8V
f-dfm
DFM Output open drain
switching freq.
Ialt=1A~0.9*Inom;1400rpm<rpm<R
PMMAX; I_sink=14mA
VL-DFM Output low voltage saturation I-sink=14mA
I-SC_DFM Short circuit current
protection
VB+ = VDFM = 12.5V
Ilk-DFM Output leakage current
VDFM=16V at DFM driver OFF
t-TM Output voltage rise time
R=1K Ohm (Fig. 7)
t-TD Output voltage fall time
R=1K Ohm (Fig. 7)
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Min. Typ. Max.
26.56 31.25 35.94
1.5
1.5
4
1.2 3
12
0.8 1.15
0.4 3.5
100
0.2 0.5
30 50
25
0.35
0.25
50 115
8 9 10
6.4 7.4 8.4
50 100
18
125 200
1.5
50 400
5
0.5 50
0.5 50
Unit
%
V
V
V
A
A
mA
µA
s
V
ms
V
V
µs
V
V
µs
mA
Hz
V
mA
µA
µs
µs
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L9911
Table 6. Load Response Control Parameters
Symbol
t_ST_1
t_ST_2
t_SL_1
t_SL_2
EN-RES
(constant)
EN-1
EN-2
EN-3
EN-4
DISAB-1
DISAB-2
DISAB-3
DISAB-4
Parameter
Soft Start Delay Time (Fig.
13) 2 steps available,
selectable by mask option
(see Table.7).
Soft Attack Time / Soft Start
Time (Fig. 13). 2 steps
available, selectable by mask
option (see Table 7).
Reset frequency range to
enable regulation; Frequency
judged after 4 periods (Fig.
12)
Soft start enable (EN) and
LRC disable (DISAB)
frequency ranges.
4 configurations available,
selectable by mask option
(possible combinations in
Table 8). Always activated at
engine start. Frequencies
judged after 4 periods (Fig.
12)
Test Condition
Activated always at engine start
From 0 to 100% field duty cycle
Tj = 25ºC
Tj = -40 to150ºC
Tj = 25ºC
Tj = -40 to150ºC
Tj = 25ºC
Tj= -40 to150ºC
Tj = 25ºC
Tj = -40 to150ºC
Tj = 25ºC
Tj = -40 to150ºC
Tj = 25ºC
Tj = -40 to150ºC
Tj = 25ºC
Tj = -40 to150ºC
Tj = 25ºC
Tj = -40 to150ºC
Min.
1.73
Typ.
0
2
Max.
2.35
Unit
s
2.13
7.65
2.5 2.87
9 10.35
s
40 50 60 Hz
108 120 132
102 120 138
Hz
Hz
131 145 159
124 145 166
Hz
Hz
144 160 176
136 160 184
Hz
Hz
174 193 212
165 193 221
Hz
Hz
270 300 330
255 300 345
Hz
Hz
315 350 385
298 350 402
Hz
Hz
367 408 449
347 408 469
Hz
Hz
420 466 512
397 466 535
Hz
Hz
Table 7. Load Response Control Timing Options
t_ST = 0s
t_ST = 2s
t_SL = 2.5s
LRC-A
LRC-C
t_SL = 9s
LRC-D
LRC-B
Table 8. Correspondence of Frequency (typical values) to Application Features
Alternator Revolution Speed (rpm)
6 Pole Pairs
8 Pole Pairs
Typical Configuration Initiate Regulation
A (Config-A)
LRC Cut
1200
3000
EN-1
DISAB-1
EN-3
DISAB-3
Typical Configuration Initiate Regulation
B (Config-B)
LRC Cut
1450
3000
EN-2
DISAB-1
EN-4
DISAB-3
Typical Configuration Initiate Regulation
C (Config-C)
LRC Cut
1450
3500
EN-2
DISAB-2
EN-4
EN-4
Considering the overall WW application scenario, there is a direct correspondence between Typical Con-
figurations A/B and regulation curve Vreg-1, and between Typical Configuration C and regulation curves
Vreg-2 and Vreg-3. This is allowing the summary of all possible customizations for L9911 in the table be-
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Table 9. Customization of L9911: Combination of LRC, Regulation, and Application Options
LRC Timing
options
LRC-A
LRC-B
LRC-C
LRC-D
Vreg-1 / Config-A
6 Pole
Pairs
8 Pole
Pairs
L9911B
nya
nya nya
Nya nya
nya nya
Vreg-1 / Config-B
6 Pole Pairs 8 Pole
Pairs
nya nya
L9911A
nya
nya nya
nya nya
Vreg-2 / Config-C
6 Pole
Pairs
6 Pole
Pairs
nya nya
nya nya
nya nya
nya nya
Vreg-3 / Config-C
6 Pole Pairs
6 Pole
Pairs
nya nya
nya nya
nya nya
nya nya
Figure 3. Vreg-1
15.2
15.1
15
14.9
14.8 Max.
14.7
14.6
14.5
14.4 Typ.
14.3
14.2
14.1
14
13.9
13.8 Min.
13.7
13.6
13.5
13.4
-40 -30 -20 -10 0 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150
14.06V~14,91V @ -5°C
T
14.00V~14.80V @ 20°C
13.42V~14,48V @ 150°C
Figure 4. Vreg-2
15.1
15
14.9
14.8
14.7
14.6
14.5
14.4
14.3
14.2
14.1
14
13.9
13.8
13.7
13.6
13.5
13.4
13.3
13.2
13.1
13
12.9
12.8
14w.60wV~w15..0D0Va@ta-5S°Cheet4U.com
14.35V~14.65V @ 23°C
12.85V~13.66V @ 150°C
Max.
Typ.
Min.
T
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L9911
Figure 5. Vreg-3
15.1
15
14.9
14.8
14.7
Max.
14.6
14.5
14.4
14.3 Typ.
14.2
14.1
14
13.9
13.8
Min.
13.7
13.6
13.5
-40 -30 -20 -10 0 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150
14.41V~14.82V @ -5°C
14.35V~14.65V @ 23°C
13.59V~14.40V @ 150°C
T
Figure 6. Output Voltage rise/fall time (F+, DFM)
90%
F+
DFM
Voltage
10%
t-rise
t-TM
t-fall
t-TD
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Figure 7. Phase Regulation Characteristics
Engine off
Ign. Switch off
on
W/Lamp off
Ifield
on
on
t_ST
t_SL
F+/DFM
Field Pre-
excitation
Field
Regulation
Load ON
PRINCIPLE OF PHASE REGULATION:
When VB+ is above the regulated voltage, the field driver is controlled to keep phase peak voltage from
falling below VPHH1.
If phase peak voltage drops below VPHL1, phase regulation does not work.
Figure 8. Application Diagram
ignition
switch
warning lamp
_+
Stator
B+ L
C
Field
L9911
F+
P
DFM
GND
+Vb / Vcc
to E.C.U.
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Figure 9. High Side/Low side driver saturation
B+
Regulator Assy
L9911
Control
Circuit
L
L9911
Figure 10. Test mode to cancel soft start/attack
DFM
Vcan
COMP
FILTER (tcan)
AND LATCH
CANCEL
Figure 11. Soft-start enable frequency range
EN-1~4
{
SOFT-START
ENABLE
FREQUENCY
EN-RES
CONSTANT
(50HZ)
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Figure 12. Soft start characteristics (always activated at engine start)
Ign. sw
on
off
Engine speed (rpm)
(soft attack inhibition Alt. speed)
0.5s min
0.5s min Time (sec)
(soft start enable Alt. speed)
Field current (A) Soft start
timing
Soft start
delay time
Soft start
timing
Soft start
delay time
Time (sec)
Soft start
timing
Soft start
delay time
0.15s~0.5s
Time (sec)
W/Lamp
on
off
Starter on
Ign. sw on
E/G stop
and Ign. sw off
Starter on
Ign. sw on
0.15s~0.5s
E/G stop
Starter on Time (sec)
Engine start
Soft attack inhibition
Alt. speed > E/G speed
Engine start Engine restart
Soft attack inhibition
Alt. speed < E/G speed
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Figure 13. Soft Start/attack Characteristics
Engine off
Ign. Switch off
on
W/Lamp off
on
on
t_ST
t_SL
Ifield
F+/DFM
Field Pre-
excitation
Field
Regulation
Load ON
L9911
Table 10. Fault Detection
Root Cause
Signal
Effect
Test detect
Alternator belt breaking
P Alternator disexcitation VP<VPHH1 & VB+<Vreg
Brushes open
P Alternator disexcitation VP<VPHH1 & VB+<Vreg
Field Driver Open
P Alternator disexcitation VP<VPHH1 & VB+<Vreg
Field interruption
P Alternator disexcitation VP<VPHH1 & VB+<Vreg
Field short circuit to the battery
F+ Overvoltage
VF+>VS1 & VB+ > Vov-d
Field short circuit to the ground
P Alternator disexcitation VP<VPHH1 & VB+<Vreg
Battery discharge
B+ Undervoltage
VB+<Vuv
The diagnostic result is disabled during the Soft-start delay time t_ST 0...3 and the soft-start / soft attack timing t_SL 0...3
Figure 14. DFMonitor Electrical configuration
L9911
B+
Alternator
Field
F+
Control
Circuit
Field driver
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Regulator assy
Valim
R
DFM
to the ECU
DFMon driver
Test circuit
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Figure 15. Short circuit drivers' protection
Current short circuit (Field driver, Relay driver, DFMon driver)
T< 25ms
Current short circuit (Lamp driver)
Filtering time
Retry time
Field driver, DFmon driver and Relay driver are protected in switching mode (not linear), with a retry time
less than 25ms.
Lamp driver is protected in linear mode, with a retry time of 1s.
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L9911
4 Package Information
In order to meet environmental requirements, ST offers these devices in ECOPACK® packages. These
packages have a Lead-free second level interconnect. 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 16. Multiwatt8 Mechanical Data & Package Dimensions
mm inch
DIM.
MIN. TYP. MAX. MIN. TYP. MAX.
A 5 0.197
B
2.65
0.104
C 1.6 0.063
E 0.49
0.55 0.019
0.022
F 0.78
0.85 0.030
0.033
G 2.40 2.54 2.68 0.094 0.10 0.105
G1 17.64 17.78 17.92 0.69 0.70 0.71
H1 19.6
0.772
H2
20.2
0.795
L 20.35
20.65 0.80
0.81
L2 17.05 17.20 17.35 0.67 0.68 0.68
L3 17.25 17.5 17.75 0.679 0.689 0.699
L4 10.3 10.7 10.9 0.406 0.421 0.429
L7 2.65
2.9 0.104
0.114
S 1.9
2.6 0.075
0.102
S1 1.9
2.6 0.075
0.102
U 0.40
0.55 0.015
0.022
Z 0.70
0.85 0.028
0.034
Dia1 3.65
3.85 0.144
0.152
OUTLINE AND
MECHANICAL DATA
Multiwatt8 (Pin 5 GND)
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0043696 F
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Table 11. Revision History
Date
Revision
June 2004
1
May 2005
2
07-Nov-2005
3
Description of Changes
First Issue.
Modified Figure 2, Table 2 and Table 5;
Updated Figure 10, 11 and 14; Add Table 7.
Add ordering numbers.
Updated Table 5.
Added new tables 6-9.
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L9911
Information furnished is believed to be accurate and reliable. However, STMicroelectronics assumes no responsibility for the consequences
of use of such information nor for any infringement of patents or other rights of third parties which may result from its use. No license is granted
by implication or otherwise under any patent or patent rights of STMicroelectronics. Specifications mentioned in this publication are subject
to change without notice. This publication supersedes and replaces all information previously supplied. STMicroelectronics products are not
authorized for use as critical components in life support devices or systems without express written approval of STMicroelectronics.
The ST logo is a registered trademark of STMicroelectronics.
All other names are the property of their respective owners
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