ATA6625 데이터 시트보기 (PDF) - Atmel Corporation

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ATA6625

LIN Bus Transceiver with Integrated Volt age Regulator

Atmel Corporation 

ATA6623/ATA6625

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 electrolythic capacitor with

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

ied 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 ATA6623/ATA6625.

11

4957H–AUTO–05/10

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