ATA6620 데이터 시트보기 (PDF) - Atmel Corporation

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ATA6620

LIN Bus Transceiver with Integrated Voltage Regulator

Atmel Corporation 

6. Voltage Regulator

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

bances from the microcontroller. It is recommend to use an tantalum capacitor with C > 10 µF

and a ceramic capacitor with C = 100 nF. The values of these capacitors can be varied by the

customer, depending on the application.

During mode change from Silent to Normal mode, the voltage regulator ramps up to 6V for only

a few microseconds before it drops back to 5V. This behavior depends on the value of the load

capacitor. With 4.7 µF, the overshoot voltage has its greatest value. This voltage decreases with

higher or lower load capacitors.

With this special SO8 package (fused lead frame to pin3) 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 6-1 shows the safe operating area of the ATA6620.

Figure 6-1.

Save Operating Area versus VCC Output Current and Supply Voltage VS at Differ-

ent Ambient Temperatures

60.00

50.00

40.00

30.00

Iout_85: Tamb = 85˚C

Iout_95: Tamb = 95˚C

Iout_105: Tamb = 105˚C

20.00

10.00

0.00

5 6 7 8 9 10 11 12 13 14 15 16 17 18 19

VS (V)

10 ATA6620

4850D–AUTO–02/06

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