ST L9349-LF User Manual

Quad intelligent power low side switch

■ Four low-side output driver with protection

diagnostics designed as a conventional switch
– 2 channels with 5 A output current

capability and r

– 2 channels with 3 A output current

capability and r

■ Integrated 60 V Zener diodes output clamping

structure

■ Output slope control

■ Short circuit protection

■ Open load detection in ON and OFF condition

■ Load bypass detection

■ Overload disable

■ Signal and power ground loss shutdown

■ Selective overtemperature shutdown

■ Electrostatic discharge (ESD) protection

Description

The L9349 is a monolithic IC designed to drive
inductive loads in low side configurations like
hydraulic valves used in ABS systems.

Particular care has been taken to protect the
device against failures, to avoid electromagnetic
interferences and to offer extensive real time
diagnostics.

The internal pull down current source at the
ENable and INput pins assures, that the device is
switched off, in case of open input conditions.

An output voltage slope limitation is implemented
to reduce the EMI.

Table 1. Device summary

Order code Package

= 0.2 Ω typ.

ON

= 0.3 Ω typ.

ON

L9349-LF

PowerSO-20

The device is equipped with an integrated Zener
diodes clamp for fast inductive load current
recirculation. This structure limits the output
voltage during the recirculation phase to 50V.

The device is self-protected against short circuit
at the outputs and overtemperature.

For the real time error diagnosis, the voltage and
the current of the outputs are compared with
internally fixed thresholds to recognize open load
in OFF and ON conditions.

The output voltages are also compared with each
other in OFF condition with a fixed offset, in order
to recognize load bypasses.

If the over load current threshold is exceeded, the
output current will be limited internally during the
diagnostic overload delay switch-off time.

All four channels are monitored with a status
output. The diagnostic output level in connection
with different enable and input conditions allows it
to recognize the different fail states.

(1)

Packing

L9349-LF PowerSO-20 Tray

L9349TR-LF PowerSO-20 Tape and reel

1. ECOPACK® package (see Section 4: Package information)

September 2008 Rev 5 1/17

www.st.com

1

Contents L9349-LF

Contents

1 Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

2 Pins description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

3 Electrical specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

3.1 Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

3.2 Thermal data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

3.3 Electrical characteristics (operating range) . . . . . . . . . . . . . . . . . . . . . . . . 8

3.4 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

3.5 Diagnostic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

3.6 Circuit description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

4 Package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

5 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

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L9349-LF List of tables

List of tables

Table 1. Device summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

Table 2. Pins description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Table 3. Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Table 4. Thermal data. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Table 5. Electrical characteristics (operating range). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Table 6. Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Table 7. Diagnostic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Table 8. Corresponding filter time for each detected signal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

Table 9. Document revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

3/17

List of figures L9349-LF

List of figures

Figure 1. Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Figure 2. Pins connection (top view) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Figure 3. t

Figure 4. Output slope (resistive load for testing) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

Figure 5. Timing (t

Figure 6. Block diagram - Open load voltage detection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Figure 7. Logic diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

Figure 8. Application circuit diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

Figure 9. PowerSO-20 mechanical data and package dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . 15

clamping time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

EO

, t

DOL

). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

DIOU

4/17

L9349-LF Block diagram

1 Block diagram

Figure 1. Block diagram

IN1

D1

EN

IN4

D4

IN2

D2

IN3

D3

00AT0025

Output Control

Diagnostic

Control

R

QS

Channel 1

Delay

Time

Channel 4

Channel 2

Channel 3

GND

Overtemp

Overload

Openload

52V

OUT1

VS

OUT4

R

IO

OUT2

OUT3

5/17

Pins description L9349-LF

2 Pins description

Figure 2. Pins connection (top view)

Heat sink connected
to pins 1, 10, 11, 20

PGND 1

OUT1 2

D1

3

IN4 4

VS 5

NC

6

IN3 7

D2 8

OUT2

PGND 10

00AT0026

Table 2. Pins description

9

N° Pin Function

1 PGND Power Ground

2 Out1 Output 1 (5A)

3 D1 Diagnostic 1

4IN4Input 4

5 VS Supply Voltage

6 NC Not Connected

7IN3Input 3

20 PGND

OUT4

19

D418
IN117
EN

16

GND15
IN214

13

D3
OUT312
PGND11

8 D2 Diagnostic 2

9 Out2 Output 2 (5A)

10 PGND Power Ground

11 PGND Power Ground

12 Out3 Output 3 (3A)

13 D3 Diagnostic 3

14 IN2 Input 2

15 GND Signal Ground

16 EN Common Enable

17 IN1 Input 1

18 D4 Diagnostic 4

19 Out4 Output 4 (3A)

20 PGND Power Ground

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