ATA6628 データシートの表示（PDF） - Atmel Corporation

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ATA6628

LIN Bus Transceiver with 3.3V (5V) Regulator and Watchdog

Atmel Corporation 

5.6 Voltage Regulator

The voltage regulator needs an external capacitor for compensation and for smoothing the disturbances from the

microcontroller. It is recommended to use an electrolythic 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.

The main power dissipation of the IC is created from the VCC output current IVCC, which is needed for the application. In

Figure 5-2 on page 18 the safe operating area of the Atmel® ATA6630 is shown.

Figure 5-1. VCC Voltage Regulator: Ramp-up and Undervoltage Detection

VS

12V

5.5V/3.8V

VCC

5V/3.3V

Vthun

NRES

5V/3.3V

TVCC

TReset

t

Tres_f

t

t

Figure 5-2. Power Dissipation: Safe Operating Area: VCC Output Current versus Supply Voltage VS at Different

Ambient Temperatures Due to Rthja = 35K/W

90

80

Tamb = 105°C

70

60

Tamb = 115°C

50

Tamb = 125°C

40

30

20

10

0

56

78

9 10 11 12 13 14 15 16 17 18

VS (V)

For microcontroller programming, it may be 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.

18 ATA6628/ATA6630 [DATASHEET]

9117I–AUTO–10/14

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