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E-L9338MD View Datasheet(PDF) - STMicroelectronics

Part NameDescriptionManufacturer
E-L9338MD Quad low side driver ST-Microelectronics
STMicroelectronics ST-Microelectronics
E-L9338MD Datasheet PDF : 14 Pages
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Circuit description
4
Circuit description
L9338
The L9338 is a quad low side driver for lines, lamps or inductive loads in automotive and
industrial applications.
All inputs are TTL or CMOS compatible. This allows the device to be driven directly by a
microcontroller. For the noise immunity, all inputs have a Schmitt-trigger with a hysteresis of
typ. 100 mV.
Each input stage has an input voltage protection from -24 V to 45 V. The device can be
activated with a ’high’ signal on Enable (EN) input. Enable ’low’ switches the device into the
sleep mode. In this mode the quiescent current is less than 10 mA. A high signal on
programming (PRG) input changes the signal transfer polarity from non inverting into the
inverting mode. Normally this pin is connected to VS or GND. These pins (PRG and EN) are
internally fixed at low status by open input condition.
Independent of the programming input, the output (OUT) switches off, if the signal input (IN)
pin is not connected.
Each output driver has a current limitation of min. 0.4 A and a separate thermal shut-down.
The thermal shut-down deactivates that output which exceeds temperature switch off level.
About 20K below this temperature threshold the output will be activated again. This means,
that each output is able to sink continuously 285 mA without activating thermal shut-down at
85 °C ambient temperature. The slew rate of the output is limited to max. 14 V/ms to reduce
the electromagnetic interference, but not for the enable transfer characteristic (see
Figure 3). An integrated active flyback voltage limitation clamps the output voltage during
the flyback phase of inductive loads to typ. 50 V. The power DMOS switches ON, if the
device is enabled and the output swings below ground. This protection avoids the activation
of parasitic inside the power DMOS.
The diagnostic (DIAG) is an open drain output. The logic status depends on the
programming pin. If the PRG pin is ’low’ the DIAG output becomes low, if the device works
correctly.
At thermal shut-down of one channel, disconnected ground or supply voltage the diagnostic
output becomes high. If the PRG pin is ’high’ this output is switched off at normal function
and switched on at over temperature.
Table 7. Diagnostic
Pins
EN
H
H
Normal function
H
H
L
Over temperature, disconnected
ground or supply voltage
H
Over temperature
H
1. Selective for each channel at over temperature.
X = not relevant.
PRG
L
L
H
H
X
L
H
IN
OUT
DIAG
L
L (on)
L (on)
H
H (off)
L (on)
L
H (off)
H(off)
H
L (on)
H(off)
X
H (off)
H(off)
X
H (off) (1)
H (off)
X
H (off) (1)
L (on)
10/14
Doc ID 1766 Rev 5
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