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ST Microelectronics
ST Microelectronics

L9911 Datasheet

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.
Page 1

L9911www.DataSheet4U.com
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
Page 2

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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
Page 3

L9911www.DataSheet4U.com
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
4/15
Page 4
Part Number L9911
Manufactur ST Microelectronics
Description CAR ALTERNATOR MULTIFUNCTION SMART VOLTAGE REGULATOR
Total Page 15 Pages
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