L9349-LF 데이터 시트보기 (PDF) - STMicroelectronics

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L9349-LF

Quad intelligent power low side switch

STMicroelectronics 

L9349-LF

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 rON = 0.2  typ.

– 2 channels with 3 A output current

capability and rON = 0.3  typ.

■ 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.

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.

Table 1.

Device summary

Order code

Package(1)

L9349-LF

L9349TR-LF

PowerSO-20

PowerSO-20

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

Packing

Tray

Tape and reel

September 2013

Rev 6

1/17

www.st.com

1

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