L9950 STMicroelectronics, L9950 Datasheet - Page 20

• Manufacturer Part Number: L9950
• Description: IC DRIVER DOOR ACTUATOR PWRSO-36
• Manufacturer: STMicroelectronics
• Type: Door Actuator Driverr

Specifications of L9950

• Applications: Automotive
• Current - Supply: 7mA
• Voltage - Supply: 7 V ~ 28 V
• Operating Temperature: -40°C ~ 150°C
• Mounting Type: Surface Mount
• Package / Case: PowerSO-36 Exposed Bottom Pad
• Mounting Style: SMD/SMT
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Application information
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3.1
3.2
3.3
3.4
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Application information
Dual power supply: V
The power supply voltage V
charge-pump is used to drive the highside switches. The logic supply voltage V
5 V) is used for the logic part and the SPI of the device.
Due to the independent logic supply voltage the control and status information will not be
lost, if there are temporary spikes or glitches on the power supply voltage. In case of power-
on (V
internally generated power on reset (POR). If the voltage V
minimum threshold (V
and the status registers are cleared.
Standby mode
The standby mode of the L9950 is activated by clearing the bit 23 of the Input Data
Register 0. All latched data will be cleared and the inputs and outputs are switched to high
impedance. In the standby mode the current at V
CSN = high (DO in tristate). By switching the V
be achieved. If bit 23 is set, the device will be switched to active mode.
Inductive loads
Each half bridge is built by an internally connected highside and a lowside power DMOS
transistor. Due to the built-in reverse diodes of the output transistors, inductive loads can be
driven at the outputs OUT1 to OUT6 without external free wheeling diodes. The highside
drivers OUT7 to OUT11 are intended to drive resistive loads. Hence only a limited energy
(E<1 mJ) can be dissipated by the internal ESD diodes in freewheeling condition. For
inductive loads (L>100
corresponding output is needed.
Diagnostic functions
All diagnostic functions (over/open load, power supply over-/undervoltage, temperature
warning and thermal shutdown) are internally filtered and the condition has to be valid for at
least 32 µs (open load: 1 ms, respectively) before the corresponding status bit in the status
registers will be set. The filters are used to improve the noise immunity of the device. Open
load and temperature warning function are intended for information purpose and will not
change the state of the output drivers. On contrary, the overload and thermal shutdown
condition will disable the corresponding driver (overload) or all drivers (thermal shutdown),
respectively. Without setting the over-current recovery bits in the Input Data register, the
microcontroller has to clear the over-current status bits to reactivate the corresponding
drivers.
CC
increases from under voltage to V
POR ON
µ
H) an external free wheeling diode connected to GND and the
S
= 3.4 V), the outputs are switched to tristate (high impedance)
supplies the half bridges and the highside drivers. An internal
Doc ID 10311 Rev 10
S
and V
POR OFF
CC
CC
S
voltage a very low quiescent current can
(V
= 4.2 V) the circuit is initialized by an
CC
) is less than 6 µA (50 µA) for
CC
decreases under the
L9950 - L9950XP
CC
(stabilized