L9904 STMicroelectronics, L9904 Datasheet - Page 11

• Manufacturer Part Number: L9904
• Description: IC CTRLR MOTOR BRIDGE SO-20
• Manufacturer: STMicroelectronics
• Type: Motor Bridger

Specifications of L9904

• Applications: DC Motor Controller
• Number Of Outputs: 2
• Voltage - Supply: 8 V ~ 20 V
• Operating Temperature: -40°C ~ 150°C
• Mounting Type: Surface Mount
• Package / Case: 20-SOIC (7.5mm Width)
• Operating Supply Voltage: 40 V
• Supply Current: 10 mA
• Mounting Style: SMD/SMT
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Current - Output: -
• Voltage - Load: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

3
3.1 General
The L9904 integrated circuit (IC) is designed to control four external N-channel MOS transistors in H-Bridge con-
figuration for DC-motor driving in automotive applications. It includes an ISO9141 compatible interface. A typical
application is shown in fig.9.
3.2 Voltage supply
The IC is supplied via an external reverse battery protection diode to the V
range is down to 8V.
The supply current consumption of the IC composes of static and a dynamic part. The static current is typically
5.8mA. The dynamical current I
of the external power mos transistor. The current can be estimated by the expression:
An external power transistor with a gate charge of Q
quires a dynamical supply current of I
The total supply current consumption is I
3.3 Extended supply voltage range (ST)
The operating battery voltage range can be extended down to 6V using the additional components shown in
fig.7. A small inductor of L~150µH (I
with the switching open drain output ST. The switching frequency is typical 100kHz with a fixed duty cycle of
50%. The step up converter starts below V
at V
for systems with negative battery voltage. No additional load can be driven by the step up converter.
Figure 10.
V BAT
VS
FUNCTIONAL DESCRIPTION
> 10V to avoid EME at nominal battery voltage. The diode D2 in series with the ST pin is necessary only
L1
D2
D1
dyn
is depending of the PWM frequency f
peak
dyn
VS
~500mA) in series to the battery supply builts up a step up converter
C1
= 6.4mA.
VS
= 5.8mA + 6.4mA = 12.2mA.
I
dyn
< 8V, increases the supply voltage at the V
= 2 · f
C2
Gate
PWM
= 160nC and a PWM frequency of f
ST
VS
· Q
Gate
L9904
PWM
VS
and the required gate charge Q
pin. The typical operating voltage
+
f ST
-
S
=
pin and switches off
V STH
PWM
= 20kHz re-
L9904
11/17
Gate