Product category:
Power Supply ICs and Controllers
News Release from: Atmel Corporation | Subject: ATA6836
Edited by the Electronicstalk Editorial
Team on 18 July 2007
Half-bridge driver runs from any
automotive supply
Low-cost half-bridge driver IC targets automotive applications in both passenger cars and commercial vehicles.
A new low-cost half-bridge driver IC from Atmel Corp features a high voltage capability up to 40V, allowing its use in both passenger car applications (such as flap control of air condition systems) and in 24V truck applications The ATA6836 is manufactured using Atmel's high-voltage 0.8 um BCD-on-SOI technology (SMARTIS) and incorporates a broad range of protection features
This article was originally published on Electronicstalk on 18 Nov 2005 at 8.00am (UK)
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Furthermore, SOI devices provide superior latch-up immunity leading to increased circuit reliability.
The ATA6836 is a fully protected hex half-bridge driver with integrated power stages.
Each of the six high-side and low-side drivers is capable of driving currents up to 650mA via a microcontroller, such as Atmel's automotive-qualified ATmega88 MCU.
Customers' assembly efforts are substantially reduced as external clamping diodes are not needed due to the half-bridge configuration.
One of the main applications of the ATA6836 is the actuation of three fully independent DC motors in three H-bridges.
The ATA6836 also supports the operation of up to five DC motors sharing four common lines, as long as the motors are not all actuated at the same time.
This configuration can be used, for example, in automotive air conditioning systems, where five air-flow control flaps can be operated from one ATA6836.
Software can be used to avoid the simultaneous actuation of the DC motors.
In addition, the half-bridge configuration also enables the operation of six different resistive or inductive loads.
The ATA6836 provides several protection features such as overtemperature warning and shutdown, overload, overvoltage protection, and full protection against short-circuits.
The SPI output register contains a number of diagnostic bits, which can be read by the microcontroller.
In the event of undervoltage at the supply pin, the power-supply fail bit in the output register is set and all outputs are disabled.
If the overtemperature pre-warning bit is set, software routines to decrease the power dissipation and temperature can be implemented.
Temperature increases beyond a certain level can force the IC to shut down to prevent destruction.
The ATA6836 features 4kV ESD protection, which provides maximum safety against damage during assembly.
The device also meets the strict automotive qualification demands (protection against conducted interference, EMC, and ESD protection) and can withstand transients as specified in ISO/TR 7637.
Samples of the ATA6836 driver IC are available now in Pb-free QFN24 packages, measuring only 5 x 5mm.
Customers using the predecessor version, T6816, can easily switch to the SO28 package to accommodate new designs.
For applications with more powerful DC motors, Atmel offers the high-power version ATA6838 with 1.5A output stages.
All other features are identical to the ATA6836.
Pricing starts at US $2.00 for the ATA6836 and at US $2.10 for the ATA6838 for 10,000-piece quantities each.
An applicationboard for development support can be ordered for US $130.
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