ATA6834 ATMEL Corporation, ATA6834 Datasheet - Page 7

• Manufacturer Part Number: ATA6834
• Description: (ATA6833 / ATA6834) BLDC Motor Driver and LIN System Basis Chip
• Manufacturer: ATMEL Corporation

3.3
Figure 3-2.
9122D–AUTO–09/09
4 0
3 0
2 0
5V/3.3V VCC Regulator
3 5
2 5
10
15
0
5
0
ESR versus Load Current for External Capacitors with Different Values
ESR versus Load Current at Pin VCC
2 5
ESR
ESR
Load Current (mA)
max
min
50
(C
(C
The 5V/3.3V regulator is fully integrated. It requires an external electrolytic capacitor in the range
of 2.2 µF up to 10 µF and with an ESR in the range from 2 to 15 for stability (see
The output voltage can be configured as either 5V or 3.3V by connecting pin VMODE to either
pin VINT or GND. Since the regulator is not designed to be switched between both output volt-
ages during operation, it is advisable to hard-wire VMODE pin. The logic levels of the
microcontroller interface are adapted to the VCC regulator output voltage. The maximum output
current (I
80 mA. The VCC regulator has a built-in short circuit protection. A comparator checks the output
voltage of the VCC regulator and keeps the external microcontroller in reset as long as the volt-
age is below the lower operation minimum (shown in
Figure 3-3.
VCC
VCC
= 2.2 µF)
= 2.2 µF)
75
OS1
) of the regulator is 100 mA. For T
10 0
/RESET as Function of the VCC Output Voltage
100% VCC
88% VCC
80% VCC
/RESET
12 5
VCC
0V
150
ATA6833/ATA6834 [Preliminary]
2 0
2 5
10
15
0
5
0
J
ESR versus Load Current at Pin VCC
> 150°C the I
2 5
Figure
ESR
ESR
min
Load Current (mA)
(C
50
max
3-33).
VCC
(C
= 10 µF)
VCC
OS1
= 10 µF)
75
of ATA6834 is reduced to
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10 0
12 5
Figure
150
3-2).
7