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L9911I
Multifunction Smart Regulator with Lamp/Relay Diagnostic Driver
September 2013 Doc ID10990 Rev 12 1/19
L9911Car alternator multifunction smart voltage regulator
Datasheet production data
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)
DescriptionThe 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
circuits.
Table 1. Device summary
Contents L99112/19 Doc ID10990 Rev 12
Contents Circuit operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51.1 Voltage regulation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
1.2 Protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
1.3 Diagnosis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
1.4 Load response control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Electrical specification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73.1 Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
3.2 Thermal data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
3.3 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
3.4 Principle of phase regulation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
L9911 List of tables
Doc ID10990 Rev 12 3/19
List of tables
Table 1. Device summary. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Table 2. Pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Table 3. Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Table 4. Thermal data. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Table 5. Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Table 6. Load response control parameters. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Table 7. Load response control timing options. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Table 8. Correspondence of frequency (typical values) to application features . . . . . . . . . . . . . . . . 11
Table 9. Customization of L9911: combination of LRC, regulation, and application options . . . . . . 11
Table 10. Fault detection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Table 11. Document revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
List of figures L9911
4/19 Doc ID10990 Rev 12
List of figures
Figure 1. Pin connection (top view) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Figure 2. Vreg-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Figure 3. Vreg-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Figure 4. Vreg-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Figure 5. Vreg-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Figure 6. Output voltage rise/fall time (F+, DFM). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Figure 7. Phase regulation characteristics. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Figure 8. Application diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Figure 9. High side/low side driver saturation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Figure 10. Test mode to cancel soft-start/attack . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Figure 11. Soft-start enable frequency range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Figure 12. Soft-start characteristics (always activated at engine start) . . . . . . . . . . . . . . . . . . . . . . . . 15
Figure 13. Soft start/attack characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Figure 14. DF monitor electrical configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Figure 15. Short circuit drivers' protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Figure 16. Multiwatt8 mechanical data and package dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
L9911 Circuit operation
Doc ID10990 Rev 12 5/19
1 Circuit operation
The alternator's voltage regulator performs the following main functions: voltage regulation
2. protection
3. control fault diagnosis
4. load response control
1.1 V oltage regulation
The alternator voltage is compared with a reference voltage in an amplifier, whose output
determines the switching frequency of output power MOS whose current excites the coil of
the alternator; 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 switching spikes. The internal filtering allows the usage of
the device also with very long cables connecting the alternator to the battery with an
impedance so high to cause a superimposed ripple on the alternator voltage higher than 5- . Consequently it doesn't need, in the standard application, any external component.
Anyway an external capacitor (2.2µF) must be inserted between A+ and ground when using
the device with very long cables.
1.2 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 power drivers.
1.3 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 delayed by a fixed time.
1.4 Load response control
The internal circuit regulates the soft start characteristics (activated always at engine start)
and the soft attack characteristics.
Pin description L9911
6/19 Doc ID10990 Rev 12
2 Pin description
Figure 1. Pin connection (top view)
Table 2. Pin description
L9911 Electrical specification
Doc ID10990 Rev 12 7/19
3 Electrical specification
3.1 Absolute maximum ratings
Tj = -40 to 150 °C, unless otherwise specified.
3.2 Thermal data
3.3 Electrical characteristics
Tj = -40 °C to 150 °C; unless otherwise specified.
Table 3. Absolute maximum ratings
Table 4. Thermal data
Table 5. Electrical characteristics
Electrical specification L9911
8/19 Doc ID10990 Rev 12
Table 5. Electrical characteristics (continued)
L9911 Electrical specification
Doc ID10990 Rev 12 9/19
Table 5. Electrical characteristics (continued)
Electrical specification L9911
10/19 Doc ID10990 Rev 12
Guaranteed by design.
Table 5. Electrical characteristics (continued)
Table 6. Load response control parameters
Table 7. Load response control timing options
