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L9349
QUAD INTELLIGENT POWER LOW SIDE SWITCH
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L9349September 2002 Quad power low side driver with 2 x 5A and
2 x 3A output current capability Low RDSON typically 200mΩ and 300mΩ
@ Tj = 25°C Internal output clamping structures with
VFB = 50V for fast inductive load current
recirculation Limited output voltage slew rate for low EMI Protected μP compatible enable and input Wide operating supply voltage range 4.5V to 32V 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 Device protection functions: Overload disable Selective thermal shutdown
DESCRIPTIONThe 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
tensive real time diagnostic.
QUAD INTELLIGENT POWER LOW SIDE SWITCH
BLOCK DIAGRAM
L9349 2/12
PIN CONNECTION
PIN DESCRIPTION
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L9349
THERMAL DATA
ABSOLUTE MAXIMUM RATINGSI
Electrical Characteristcs (Operating Range)The electrical characteristics are valid within the below defined operating range, unless otherwise specified. tEO is the clamping time (see Figure 1) Parameters guaranteed by correlation
L9349 4/12
ELECTRICAL CHARACTERISTICS (VS = 4.5 to 32V; -40°C ≤ Tj1 ≤ 150°C < Tj2 ≤ TjDIS, unless other-wise specified.)
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L9349 The diagnostic output is short circuit protected up to VD = 16V Open pins (EN, IN) are detected as low VS = 9 to 16V ∧ IOUC ≤ IO ≤ IOOC
ELECTRICAL CHARACTERISTICS (continued)(VS = 4.5 to 32V; -40°C ≤ Tj1 ≤ 150°C < Tj2 ≤ TjDIS, unless other-wise specified.)
L9349 6/12
DIAGNOSTIC TABLE
CIRCUIT DESCRIPTIONThe 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 ≥ 20KΩ, RL > 38Ω) 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 ΔVOUV
to recognize load bypasses. The ΔVOUV diagnoses is suppressed during the flyback phases of the compared
output. The outputs 1 and 4 are compared for ΔVOUV 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.
