L9349-LF STMicroelectronics, L9349-LF Datasheet - Page 11

• Manufacturer Part Number: L9349-LF
• Description: IC IPS LOW SIDE QUAD POWERSO20
• Manufacturer: STMicroelectronics
• Type: Low Sider

Specifications of L9349-LF

• Input Type: Non-Inverting
• Number Of Outputs: 4
• On-state Resistance: 200 mOhm, 300 mOhm
• Current - Output / Channel: 3A, 5A
• Current - Peak Output: 6A, 10A
• Voltage - Supply: 4.5 V ~ 32 V
• Operating Temperature: -40°C ~ 150°C
• Mounting Type: Surface Mount
• Package / Case: PowerSO-20 Exposed Bottom Pad
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

L9349-LF
3.6
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 V
circuit condition the output will be disabled after a short delay time t
for T
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 values V
(R
Also the output voltages V
fixed offset of
during the flyback phases of the compared output. The outputs 1 and 4 are compared for
Δ
The diagnostic output level in connection with different ENable and INput conditions allows
to recognize different fail states, like overtemp, short to V
and disconnected load (see
The diagnostic output is protected against short circuit. Exceeding the over load current
threshold I
delay switch-off time t
The device complies the I
failures of the functionality. Therefore some diagnostic functions are internal filtered. The
following table shows the corresponding filter time for each detected signal.
Table 8.
Overloading of output
(also shorted load to supply)
Open load
(under voltage detection)
Open load
(under current detection)
Overtemperature
Power-signal GND-loss
Power-signal GND-loss
Openload difference
V
L
OUV
≥ 20K
J
> 180°C of the output will be reset if the junction temperature decreases about 20°C
and also outputs 2 and 3 are compared.
Ω
OOC
, R
Corresponding filter time for each detected signal
Δ
L
, the output current will be limited internally during the diagnostic overload
V
> 38
OUV
Ω
to recognize load bypasses. The
) in OFF and ON conditions.
DOL
.
SO
O1- 4
OUV
Table 7:
pulses imposed to the supply voltage of the valves without any
EN and IN =
for OFF and I
ON State
are compared to each other output in OFF condition with a
HIGH
X
X
X
X
Diagnostic).
OUC
OFF State
EN or IN,
= LOW
OUT
X
X
X
for ON conditions to recognize open load
< 32V and thermal overload. In short
Δ
V
OUV
S
, short to GND, bypass to GND
Filter
min.
time
4
4
4
4
4
diagnoses is suppressed
μ
-
-
μ
μ
μ
μ
s
s
s
s
s
Electrical specifications
DOL
. The thermal disable
Reset done by
INx = “LOW”
INx = “LOW”
INx = “LOW”
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