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L9349DIE1 Schematic ( PDF Datasheet ) - STMicroelectronics

Teilenummer L9349DIE1
Beschreibung QUAD INTELLIGENT POWER LOW SIDE SWITCH
Hersteller STMicroelectronics
Logo STMicroelectronics Logo 




Gesamt 12 Seiten
L9349DIE1 Datasheet, Funktion
L9349
QUAD INTELLIGENT POWER LOW SIDE SWITCH
s Quad power low side driver with 2 x 5A and
2 x 3A output current capability
s Low RDSON typically 200mand 300m
@ Tj = 25°C
s Internal output clamping structures with
VFB = 50V for fast inductive load current
recirculation
s Limited output voltage slew rate for low EMI
s Protected µP compatible enable and input
s Wide operating supply voltage range 4.5V to 32V
s Real time diagnostic functions:
– Output shorted to GND
– Output shorted to VSS
– Open load detection in ON and OFF condition
– Load bypass detection
– Overtemperature detection
s Device protection functions:
– Overload disable
– Selective thermal shutdown
s Signal- and Power-Ground-loss shutdown
BLOCK DIAGRAM
PowerSO20
BARE DIE
ORDERING NUMBERS:
L9349
L9349DIE1
DESCRIPTION
The L9349 is a monolithic integrated quad low side
driver realized in an advanced MultipowerBCD mixed
technology. The device is intended to drive valves in
automotive environment.
The inputs are µP compatible. Particular care has
been taken to protect the device against failures, to
avoid electromagnetic interferences and to offer ex-
tensive real time diagnostic.
IN1
D1
Channel 1
EN
OUT1
VS
Output Control
52V
OUT4
IN4
Overtemp
RIO
R
QS
Delay
Time
Overload
D4
Diagnostic
Control
Channel 4
Openload
IN2
D2
Channel 2
OUT2
September 2002
IN3
D3
00AT0025
Channel 3
GND
OUT3
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L9349DIE1 Datasheet, Funktion
L9349
DIAGNOSTIC TABLE
Conditions
Normal Function
GND short
VOtyp < 0.55VS
Load bypass
VO1-4/2-3 1.25V
Open Load
IO1,2,3,4typ < 320mA
Tjtyp 190°C Overtemperature
Over Load
IOmin 1,2 > 5A
IOmin 3,4 > 3A
SGND or PGND loss
channel off
SGND or PGND loss
channel on
EN
IN
OUT
DIAG.
L X off L
H L off L
H H on H
L X off H
H L off H
H H on L
X X off L
H H off L
X L off H
H H off L
CIRCUIT DESCRIPTION
The L9349 is a quad low side driver for inductive loads like valves in automotive environment. The internal pull
down current sources at the ENable and INput pins assure in case of open input conditions that the device is
switched off. An output voltage slope limitation for du/dt is implemented to reduce the EMI. An integrated active
flyback voltage limitation clamps the output voltage during the flyback phase to 50 V.
Each driver is protected against short circuit at VOUT < 32V and thermal overload. In short circuit condition the
output will be disabled after a short delay time tDOL. The thermal disable for TJ > 180°C of the output will be
reset if the junction temperature decreases about 20°C below the disable threshold temperature.
The overtemperature, overload and groundloss information is stored until IN is low.
For the real time error diagnosis the voltage and the current of the outputs are compared with internal fixed val-
ues VOUV for OFF and IOUC for ON conditions to recognize open load (RL 20K, RL > 38) in OFF and ON
conditions.
Also the output voltages VO1- 4 are compared to each other output in OFF condition with a fixed offset of VOUV
to recognize load bypasses. The VOUV diagnoses is suppressed during the flyback phases of the compared
output. The outputs 1 and 4 are compared for VOUV and also outputs 2 and 3 are compared.
The diagnostic output level in connection with different ENable and INput conditions allows to recognize differ-
ent fail states, like overtemp, short to VS, short to GND, bypass to GND and disconnected load (see diagnostic
table).
The diagnostic output is protected against short circuit. Exceeding the over load current threshold IOOC, the out-
put current will be limited internally during the diagnostic overload delay switch-off time tDOL.
The device complies the ISO pulses imposed to the supply voltage of the valves without any failures of the func-
tionality. Therefore some diagnostic functions are internal filtered. The following table shows the corresponding
filter time for each detected signal.
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L9349DIE1 pdf, datenblatt
L9349
Information furnished is believed to be accurate and reliable. However, STMicroelectronics assumes no responsibility for the consequences
of use of such information nor for any infringement of patents or other rights of third parties which may result from its use. No license is granted
by implication or otherwise under any patent or patent rights of STMicroelectronics. Specifications mentioned in this publication are subject
to change without notice. This publication supersedes and replaces all information previously supplied. STMicroelectronics products are not
authorized for use as critical components in life support devices or systems without express written approval of STMicroelectronics.
The ST logo is a registered trademark of STMicroelectronics
© 2002 STMicroelectronics - All Rights Reserved
STMicroelectronics GROUP OF COMPANIES
Australia - Brazil - Canada - China - Finland - France - Germany - Hong Kong - India - Israel - Italy - Japan -Malaysia - Malta - Morocco -
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http://www.st.com
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