ATA6631(2014) 데이터 시트보기 (PDF) - Atmel Corporation

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ATA6631
(Rev.:2014)

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 disturbances from the

microcontroller. It is recommended to use an electrolytic capacitor with C > 1.8µF and a ceramic capacitor with C = 100nF.

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 80K/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 Atmel® ATA6631.

Figure 6-2. Power Dissipation: Safe Operating Area: VCC Output Current versus Supply Voltage VS at Different

Ambient Temperatures Due to Rthja = 80K/W

90

80

70

60

50

Tamb = 85°C

40

Tamb = 95°C

Tamb = 105°C

30

Tamb = 115°C

20

10

0

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

VS (V)

For programming purposes of the microcontroller, it is potentionally necessary to supply the VCC output via an external

power supply while the VS Pin of the system basis chip is disconnected. This will not affect the system basis chip.

ATA6629/ATA6631 [DATASHEET]

15

9165F–AUTO–10/14

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