Datasheet L9473 Datasheet (ST)

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

10

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

3/10

Electrical specifications L9473

2 Electrical specifications

2.1 Absolute maximum ratings

Table 3. Absolute maximum ratings

Symbol Parameter Value Unit

I

OC

P

Output current capability Internally limited A

Power dissipation 6 W

tot

Short circuit protected

All terminal, to VGO

and GND

2.2 Thermal data

Table 4. Thermal data

Symbol Parameter Value Unit

T

T

T

R

th j-case

Junction temperature -40 to +150 °C

j

Storage temperature -50 to +150 °C

stg

Thermal shut-down 175 ± 15 °C

sd

Thermal resistance junction to case 1.5 °C/W

2.3 Electrical characteristcs

Table 5. Electrical characteristcs

Symbol Parameter Test condition Min. Typ. Max. Unit

(T

= -35°C to +150°C continuous unless otherwise specified)

case

T

= +25°C to =150°C8 VovV

V

I

Operating supply voltage

OS

Standby current

SB

case

T

= -40°C to +25°C10 VovV

case

V

= 12.6V; T

GO

10kΩ V

to TS; F+, G & Tab

GO

(Slug) Grounded; L, DF, & P
unconnected; Regulator NOT
Activated.

10kΩ between V

V

Regulator set-point

SP

NTC thermistor with R
10kΩ; Tj = 90°C

V

V

Generator output, no battery

NB

T

Thermal compensation Voltage @ VGO Curves shown in Figure 4 and 5

C

Load regulation 6500 grpm, 10% to 95% load 300 mV

LR

No battery, I
Max. Load

4/10

= 25°C;

case

and TS Curve shown in Figure 3

GO

25°C

=

Curves shown in Figure 4

(with MURATA NTC NTH4G39A1)

= 2A to 50%

OUT

V

- 2

SP

300 μA

+

V

SP

2

V

L9473 Electrical specifications

Table 5. Electrical characteristcs (continued)

(T

= -35°C to +150°C continuous unless otherwise specified)

case

Symbol Parameter Test condition Min. Typ. Max. Unit

V

V

F-ON

V

F-ON

I

F-LIM

I

F-LIM

I

G-MIN

V

I

F

V

I

DF-LK

F

TURBO

1. The Field Drive capability shall not decrease as a function of temperature between 25°C and 150°C, at a rate faster than -

0.024A/°C (for example, Field Drive shall be capable of ≥7.2A at 100°C).

Speed regulation 15A load, 2000 to 20,000 grpm 100 mV

SR

I

= 6A, VGO = 14.0V,

Output saturation voltage

Output saturation voltage

Field limit current

Field limit current

(1)

1

Min. generator current load

Field discharge diode IF = 6A, T

D-F

Diode reverse current VR = 20V 1 mA

D-R

Oscillation frequency During LRC operation 340 400 460 Hz

OSC

DF saturation voltage IDF ≤ 10mA 0.8 V

DF

F

T

= 25°C

case

= 5A, VGO = 13.5V,

I

F

= 125°C

T

case

Current F+ Terminal to Gnd.

case

≤ 25°C

@ T

Current F+ Terminal to Gnd.
@ T

= +150°C

case

Current measured @ generator
output

= 25°C1.85V

case

9.0 A

6.0 A

0.5 A

DF output leakage current VDF < 25V 10 μA

Internal clock frequency VDF = 32 - 35V; at 2.2kΩ 4X Hz

750 mV

850 mV

Figure 3. Set-point voltage vs. mounting tab temperature

(10kΩ between V

15.4

15.4

15.3

15.3

15.17

15.17

15.2

15.2

15

15

15.01

15.01

14.8

14.8

14.84

14.84

Volts

Volts

14.6

14.6

14.4

14.4

14.2

14.2

-40 -20 0 20 40 60 80 100 120

-40 -20 0 20 40 60 80 100 120

and TS)

GO

15.08

15.08

14.86

14.86

14.69

14.69

Junction Temp

Junction Temp

14.77

14.77

14.59

14.59

14.41

14.41

14.3

14.3

5/10

Electrical specifications L9473

Figure 4. Set-point voltage vs. thermistor temperature, Tj = 90°C

(Not guaranteed by testing, depending on NTC characteristics)

15.2

15.04

15

14.8

14.73

14.6

14.4

Volts

14.2

14

13.8

13.6

13.4

-40 -20 0 20 40 60 80 1 00 120

14.88

14.49

13.91

13.53

NTC Temp

Figure 5. Set-point voltages vs. mounting tab temperature (TS-Open)

15.0

15.0

14.8

14.8

14.73

14.73

14.6

14.6

14.4

14.4

14.2

14.2

14.12

14.12

14.0

14.0

13.8

13.8

Set Voltage

Set Voltage

13.6

13.6

13.4

13.4

13.2

13.2

13.0

13.0

-40 -20 0 20 40 60 80 100 120 140 160

-40 -20 0 20 40 60 80 100 120 140 160

14.63

14.63

14.00

14.00

Temp

Temp

14.43

14.43

13.78

13.78

Table 6. Diagnostic

(T

= -35°C to +150°C unless otherwise specified)

case

Symbol Parameter Conditions Min. Typ. Max. Units

+

V

SP

V

OV

V

UV

V

L-SAT

V

L-SAT-BO

V

L-RLY

T

DELAY

Over voltage VSP + 1

F

> F

Under voltage

P

S_term and V

Lamp ON saturation voltage IL = 0.5A (sinked by ASVR) >V

Lamp ON voltage

(1)

Lamp OFF (Relay Drive)
saturation voltage (vs. B+)

IL < 0.5A, VGO = Open; T

-35°C to 85°C

IL = 750mA (Sourced by ASVR)

(2)

T

case

, 10kohm between

P-LRC

GO

< 125°C

case

10.95 11.8 V

L-ACT

1.33 1.45 V

=

Fault Indication Delay Time Delay before Lamp ON 0.9 1.1 1.3 s

V

+ 2 V

1.3

SP

3.8 5 V

1.85 V

1. This condition can happen when the connection between the battery and VGO or the output terminal of the generator is
broken. The 1.1 second delay is not required, and current is sinked by ASVR.

2. When no fault is detected the Lamp terminal is pulled up by ASVR.

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L9473 Electrical specifications

Table 7. Fault indication

Conditions TDelay?

Table 8.

Initial KEY-ON Bulb and Wiring Check (Lamp ON for 1 sec ± 15% after initial KEY­ON)

VGO > V

V

F

No connection between battery and V

At start: Lamp ON until F

Regulation characteristics

P

P

< V

< F

P-F

P-TR

OV

AND VGO < V

@ V

P-TR

SP

P>FP-IR

GO

AND VP>V

. i.e. until VP reaches 8V. No

P-F

No

Ye s

Ye s

Ye s

No

Symbol Parameter Conditions Min. Typ. Max. Unit

V

I

V

F

F

L-PD

P-TR

L terminal regulator activate

L-PD

threshold

L terminal pull down current

Initiate regulation phase voltage

P-IR

threshold

I

Phase terminal current sink

P

Initiate regulation phase

P-IR

frequency

Terminate regulation phase
frequency

IRD Initiate regulation delay

VGO=12.6V 0.8 1 1.15 V

VL = V
VGO=12.6V

L-ACT

0.09 0.78 mA

Regulator Activated 1.1 1.3 1.5 V

VP > 1.5V and < 12.6V
VGO = 12.6V

0.25 3.5 mA

123 145 167 Hz

59 72 86 Hz

Regulator Activated, V
F

Conditions Met First Time.

P-IR

P-IR

AND

2.533.5s

Regulator Activated AND

FSDC Field strobe duty cycle

(Regulation Terminated OR

16 18.75 22 %

Regulation NOT Initiated)

LRC Load response control rate Field Drive Duty Cycle Increase 8.5 10 11.5 %/s

F

P-LRC

SS Soft-start

LRC transition frequency LRC Enabled if FP < F

LRC enabled until V

SP

regardless other conditions

P-LRC

reached

255 300 345 Hz

34 40 46 %/s

7/10

Package information L9473

3 Package information

In order to meet environmental requirements, ST (also) offers these devices in ECOPACK®
packages. ECOPACK

®

packages are lead-free. The category of second Level Interconnect
is marked on the package and on the inner box label, in compliance with JEDEC Standard
JESD97. The maximum ratings related to soldering conditions are also marked on the inner
box label.

ECOPACK is an ST trademark. ECOPACK specifications are available at: www.st.com.

Figure 6. Multiwatt8 mechanical data and package dimensions

DIM.

A50.197

B 2.65 0.104

C1.60.063

E 0.49 0.55 0.019 0.022

F 0.78 0.85 0.030 0.033

G 2.40 2.54 2.68 0.094 0.10 0.1 05

G1 17.64 17.78 17.92 0.69 0.70 0. 71

H1 19.6 0.772

H2 20.2 0.795

L 20.35 20.65 0.80 0.81

L2 17.05 17.20 17.35 0.67 0.68 0.68

L3 17.25 17.5 17.75 0.679 0.689 0.699

L4 10.3 10.7 10.9 0.406 0.421 0.429

L7 2.65 2.9 0.104 0.114

S 1.9 2.6 0.075 0.102

S1 1.9 2.6 0.075 0.1 02

U 0.40 0.55 0.015 0.022

Z 0.70 0.85 0.028 0.034

Dia1 3.65 3.85 0.144 0.152

mm inch

MIN. TYP. MAX. MIN. TYP. MAX.

OUTLINE AND

MECHANICAL DATA

Multiwatt8 (Pin 5 GND)

8/10

0043696 F

L9473 Revision history

4 Revision history

Table 9. Document revision history

Date Revision Changes

20-May-1994 1 Initial release.

24-Oct-2008 2

Document reformatted.
"Added ECOPACK mention" in Section 3: Package information.

9/10

L9473

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