ST L9466 User Manual

Features

■ For air and liquid cooled applications

■ DF output (inverted field monitor)

■ Thermal protection

■ FIeld driver, lamp driver, relay driver, and DF

(field monitor) short circuit protected

■ Load response control

■ Single phase autostart

Description

The L9466 is a monolithic multifunction generator
Voltage regulator intended for use in automotive
charging applications.

Table 1. Device summary

L9466

Car alternator voltage regulator

Multiwatt8

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.

Order code Package Packing

L9466N Multiwatt8 Tube

October 2008 Rev 2 1/11

www.st.com

11

Contents L9466

Contents

1 Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

2 Pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

3 Electrical specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

3.1 Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

3.2 Thermal data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

3.3 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

4 Package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

5 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

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L9466 Block diagram

1 Block diagram

Figure 1. Block diagram

Key SW.

Fault

R

Relay

Lamp

L

ASVR

VGO

P

F+

Starter

Battery

Stator

To
ECM

DF

C

Field
(Rotor)

Rectifier
Bridge

Loads

3/11

Pin description L9466

2 Pin description

Table 2. Pin description

N° Pin Description

1V

Generator Output – Voltage Sense and Power Supply to ASVR

GO

2 F+ Field Driver - High Side Drive Output

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

4 NC Not connected

5 Gnd Internally connected to the Tab or Slug in MW-8.

6 DF Inverted Field Monitor Output

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

8 P Phase Sense Input

Figure 2. Pin connection (top view)

8

7

6

5

4

3

2

1

P

L

DF

GND

NC

G

F+

V

GO

Tab connected to pin 5

4/11

D02AT502B