ST L9473 User Manual

Features

■ For air and liquid cooled applications

■ Ambient air temperature (thermistor)

compensated

■ Special default compensation curve with TS-

terminal open

■ Compensation curve with application specific

resistor on TS

■ Thermal protection

■ Field driver, lamp driver, relay driver, and df

(field monitor) short circuit protected

■ Load response control

■ Single phase autostart

L9473

Car alternator voltage regulator

Multiwatt8

Description

The L9473 is a monolithic multifunction generator
Voltage regulator intended for use in automotive
charging applications.

Table 1. Device summary

Order code Package Packing

L9473J Multiwatt8 Tube

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.

October 2008 Rev 2 1/10

www.st.com

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Contents L9473

Contents

1 Block diagram and pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

1.1 Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

1.2 Pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

2 Electrical specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

2.1 Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

2.2 Thermal data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

2.3 Electrical characteristcs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

3 Package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

4 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

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L9473 Block diagram and pin description

1 Block diagram and pin description

1.1 Block diagram

Figure 1. Block diagram

NTC

7

6

1.2 Pin description

Table 2. Pin description

N° Pin Description

1V

2 F+ Field Driver - High Side Drive Output

3 G Ground for ASVR (Must be connected for Ground for ASVR)

4 TS Thermistor Sense Terminal

5GND

6 DF Inverted Field Monitor Output

7 L Lamp - Low Side Driver; Relay - High Side Driver

8 P Phase 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

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