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Fabricante

ATA6629-TAQY

LIN Bus Transceiver with Integrated Voltage Regulator

Atmel Corporation 

6. Voltage Regulator

Figure 6-1.

VCC Voltage Regulator: Ramp Up and Undervoltage

VS

12V

5.5V/3.8V

VCC

5V/3.3V

Vthun

NRES

5V/3.3V

tVCC

tReset

tres_f

The voltage regulator needs an external capacitor for compensation and to smooth the distur-

bances from the microcontroller. It is recommended to use an electrolytic capacitor with

C > 1.8 µF and a ceramic capacitor with C = 100 nF. The values of these capacitors can be

varied by the customer, depending on the application.

With this special SO8 package (fused lead frame to pin 3) an Rthja of 80 K/W is achieved.

Therefore, it is recommended to connect pin 3 with a wide GND plate on the printed board to get

a good heat sink.

The main power dissipation of the IC is created from the VCC output current IVCC, which is

needed for the application.

Figure 6-2 shows the safe operating area of the ATA6629/ATA6631.

14 ATA6629/ATA6631

9165B–AUTO–05/10

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