This is information on a product in full production.
June 2016 DocID029462 Rev 1 1/14
L9408F
Automotive multifunction smart alternator regulator
Datasheet - production data
Features
AEC-Q100 qualified
Fully monolithic design
Low 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)
Description
The L9408F is a monolithic multifunction
alternator voltage regulator.
It includes the control section, the field power
stage, fault diagnostic circuit which drives a
warning lamp.
DIE
*$3*36
Table 1. Device summary
Order code Package Packing
L9408FDIETR DIE -
www.st.com
Contents L9408F
2/14 DocID029462 Rev 1
Contents
1 Pad description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
2 Electrical specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
2.1 Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
2.2 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
3 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
DocID029462 Rev 1 3/14
L9408F List of tables
3
List of tables
Table 1. Device summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Table 2. Pad description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Table 3. Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Table 4. Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Table 5. Thermal compensation (Vreg, standard version). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Table 6. Fault detection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Table 7. Application summary features (standard option) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Table 8. Document revision history. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
List of figures L9408F
4/14 DocID029462 Rev 1
List of figures
Figure 1. Pad position . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Figure 2. Application diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Figure 3. Thermal compensation diagram (Vreg, standard version) . . . . . . . . . . . . . . . . . . . . . . . . . 10
Figure 4. Load transient example. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Figure 5. Start-up timing. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Figure 6. Load response control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Figure 7. DFMonitor electrical configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12
DocID029462 Rev 1 5/14
L9408F Pad description
13
1 Pad description
All dimensions are in micrometers.
Pad placement values correspond to each pad center coordinates.
Pad placement origin is the lower left corner of the die.
Table 2. Pad description
Pad name
Pad placements Pad dimensions
XYXY
test 4299.25 4233.25 102.5 102.5
DF 4021.625 3827.25 948.25 917.5
PVREG 4445.25 2171.75 102.5 102.5
P51 4445.25 1982.75 102.5 102.5
P52 4445.25 1793.75 102.5 102.5
P4 4414.25 1608.75 102.5 102.5
P3 4445.25 1423.25 102.5 102.5
P1 4445.25 1234.25 102.5 102.5
P2 4445.25 1044.75 102.5 102.5
P0 4445.25 856.25 102.5 102.5
P54 4380.75 680.25 102.5 102.5
P53 4445.25 504.25 102.5 102.5
P50 4364.75 334.75 102.5 102.5
OSCITEST 961.25 71.75 102.5 102.5
P13 622.75 95.25 102.5 102.5
P12 432.25 94.75 102.5 102.5
P11 243.25 94.75 102.5 102.5
P10 94.75 385.75 102.5 102.5
P9 64.75 571.25 102.5 102.5
DFM 398.5 1546.5 762.0 685.0
TW 1248.25 3029.75 128.5 128.5
GND 1950.0 3187.0 685.0 762.0
PH 398.5 5105.5 762.0 685.0
D+ 1319.25 6244.5 933.0 963.5
A+ 2888.25 6243.0 933.0 963.5
Pad description L9408F
6/14 DocID029462 Rev 1
Figure 1. Pad position
DocID029462 Rev 1 7/14
L9408F Electrical specifications
13
2 Electrical specifications
2.1 Absolute maximum ratings
2.2 Electrical characteristics
Tj = -40 to 150 °C; unless otherwise specified.
Table 3. Absolute maximum ratings
Symbol Parameter Value Unit
VSDC supply voltage (2 min. @ 25 °C) 24 V
-Transient supply voltage (load dump); t <500 ms @
25 °C 40 V
-Transient supply voltage (low energy spikes pulse
ISO7637/1 60 V
Ptot Total power dissipation (@ Tcase
= 150 °C, Ifield = 5 A) 5 W
- Reverse voltage all pins @ 25 °C, T = 15s -2.5 V
- DC pin current on DF, A+, GND pins (bonding limitation) 11 A
- ESD voltage (Human body model) ±4 kV
TjJunction temperature -40 to 150 °C
Tstg Storage temperature -40 to 170 °C
Table 4. Electrical characteristics
Symbol Parameter Test condition Min. Typ. Max Unit
Vbat Operating supply voltage - 8.5 - 18 V
Ib-sink Supply battery current - - - 50 mA
Ib-stby Standby current
Vbat = 12 V, T = 25 °C - - 300
μA
Vbat = 12 V, T = 40 °C - - 500
Vreg Regulated voltage & therm.
drift (standard version)
Ialt = 0.5 · Inom;
rpm = 0.5 · RPMMAX; T = 20 °C
14.3
-4
14.45
-3
14.6
-2
V
mV/°C
Vreg(1) Regulated voltage & therm.
drift (optional version)
Ialt = 0.2 · Inom;
rpm = 0.5 · RPMMAX; T = 20 °C
14.1
-11.5
14.5
-10
14.9
-8.5
V
mV/°C
fsw Switching frequency in FSDF 30 - 400 Hz
Vrpm Delta Vrpm
1800 < rpm < 12000;
Ialt = 0.3 · Inom - - 200 mV
Vload Delta Vload 0.1 · Inom < Ialt < 0.9 · Inom;
rpm = 0.5 · RPMMAX - - 200 mV
Vreg Regulated voltage without
battery Ialt = 3 A resistive - - 16 V
Electrical specifications L9408F
8/14 DocID029462 Rev 1
VOV D+ drivers disable threshold Voltage on pin A+ to have
D+ = OFF 18 - 22 V
Tj-sd Thermal shut-down DF = Off state
D+ = Off state 170 - 200 °C
Tj-sd-hys Thermal shut-down hysteresis
DF, D+ = from off state (due to
thermal shutdown) to on 2 - 10 °C
Ron Low side driver Rdson
Tj = 150 °C; I = 3 A - - 230 mΩ
Tj = 25 °C; I = 1 A - - 130 mΩ
VF Freewheeling diode DF IF = 5 A - - 2 V
IfSC(2) Short circuit threshold DF
DF = 12 V; T = -40 to 25 °C 8.5 - 18
A
DF = 12 V; T = 25 to 125 °C 7 - 18
Vs1 Output short to ground
threshold DF - 2.1 - 3.9 V
FSDF Pre-excitation F.S.D.F f = 348 Hz ±15% 10.62 12.5 14.38 %
tST Soft start delay time Activated at first running-on only - 0 s
tSL Soft attack time From 0 to 100% field duty cycle 2.5 2.88 3.39 s
Bl Soft attack blind zone % of maximum D.C. immediate
variation of soft attack 0 - 10 %
trise Output voltage rise time
Ifield = 3 A resistive
5 - 50
μs
tfall Output voltage fall time 5 - 50
Iflk
Output field driver leakage
current DF = 24 V - - 1 mA
VHS
High side driver saturation
voltage Isource = 1 A - - 1.2 V
VLS Low side driver saturation
voltage Isink = 0.25 A - - 1.5 V
VLSB Self bias without supply lamp
driver voltage ---4 V
IHSC High side current limitation A+ = 17.5 V; D+ = GND 1.2 - 3 A
ILSC Low side current limitation A+ = D+ = 17.5 V 0.45 - 1.5 A
VthD+ Enable regulator voltage D+ - 0.8 1 1.15 V
IthD+ Enable regulator pull-down
current - 0.4 - 3.5 mA
DISAB Soft attack inhibition
frequency - 265 313 360 Hz
EN1 Soft start delay time enable
frequency - 88 104 120 Hz
EN1_hy Soft start delay time enable
frequency hysteresis -EN
1-8 EN1-10 EN1-12 Hz
Table 4. Electrical characteristics (continued)
Symbol Parameter Test condition Min. Typ. Max Unit
DocID029462 Rev 1 9/14
L9408F Electrical specifications
13
Figure 2. Application diagram
VPHL1 Enable control voltage PH
high threshold Square wave 1 kHz 0.67 0.795 0.92 V
VPHL2 Enable control voltage PH low
threshold -VPHL1
-0.48
VPHL1
-0.57
VPHL1
-0.66 V
tPH PH filtering time - 15 - 120 μs
VPHH1 Diag. phase loss high voltage - 9 10.25 11.5 V
VPHH2 Diag. phase loss low voltage - 4 5 6 V
tPHD Diagnostic PH filtering time - 50 - 200 μs
IPH Phase pull-down current - 1 - 8 mA
tD Diagnostic alarm delay - 0.48 0.575 0.65 s
fDFM DFM open drain switching
frequency in FSDF 30 - 400 Hz
Vol Output low voltage DFM Isink = 25 mA - - 1.5 V
Idfml Short circuit protection DFM VDF_MON = 12 V 25 - 200 mA
Ilk Output leakage current DFM VDF_MON = 24 V - - 0.1 mA
t_TM DFM output voltage rise time R = 2.7 kΩ; C = 1 nF;
Valim = 13.5 V 0.05 - 50 μs
T_TD DFM output voltage fall time R = 2.7 kΩ; C = 1 nF;
Valim = 13.5 V 0.05 - 50 μs
1. Available through a metal option of the actual device.
2. Not tested on the die version.
Table 4. Electrical characteristics (continued)
Symbol Parameter Test condition Min. Typ. Max Unit
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Electrical specifications L9408F
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Figure 3. Thermal compensation diagram (Vreg, standard version)
Figure 4. Load transient example
Table 5. Thermal compensation (Vreg, standard version)
Temperature [°C]
Vreg
Min. [V] Typ. [V] Max. [V]
-40 14.43 14.645 14.86
25 14.30 14.45 14.60
125 13.90 14.15 14.40
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DocID029462 Rev 1 11/14
L9408F Electrical specifications
13
Figure 5. Start-up timing
The diagnostic result is disabled during the Soft-start delay time t_ST and the soft attack
timing t_SL.
Figure 6. Load response control
Table 6. Fault detection
Root cause Signal Effect Test detect
Alternator belt breaking PH Alternator dis-excitation VPH<VPHH & VA+<Vreg
Brushes open PH Alternator dis-excitation VPH<VPHH & VA+<Vreg
Field interruption PH Alternator dis-excitation VPH<VPHH & VA+<Vreg
Field short circuit to the battery PH Alternator dis-excitation VPH<VPHH & VA+<Vreg
Field short circuit to the ground DF Overvoltage DF<VS1 & VA+>Vreg
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Electrical specifications L9408F
12/14 DocID029462 Rev 1
Figure 7. DFMonitor electrical configuration
Table 7. Application summary features (standard option)
Regulation Thermal drift Pre-exc. Soft start Soft attak DF monitor
Voltage (V) (mV/°C) FS_DF (%) Delay Timing (s) Timing (s) function
14.45 -3 12.5 0 2.88 YES
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DocID029462 Rev 1 13/14
L9408F Revision history
13
3 Revision history
Table 8. Document revision history
Date Revision Changes
16-Jun-2016 1 Initial release.
L9408F
14/14 DocID029462 Rev 1
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