TLE9461ES datasheet(45/140 Pages) INFINEON

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TLE9461ES

Lite CAN SBC Family

Voltage Regulator 1

Datasheet

Rev.1.1

2019-09-27

6.2

Functional Description

The Voltage Regulator 1 (=VCC1) is always enabled in SBC Normal, Stop and Restart Mode and is disabled in

SBC Sleep and in Fail-Safe Mode. VCC1 is the voltage regulator output. VIO is the regulation feedback,

supervision input and the supply for the digital in- and outputs. Therefore, the pins VCC1 and VIO must always

be connected.

Current Limitation Configurations:

The regulator can provide an output current up to IVCC1,lim. The current limitation threshold can be adjusted

with the bits ICC1_LIM_ADJ. A soft-start feature is implemented that limits the current to the lowest value

during start-up of VCC1 as long as RSTN is Low. After tRD1 has expired, the default value is resumed after power-

up or the configured value after SBC Sleep- or Fail-Safe Mode.

For low-quiescent current reasons, the output voltage accuracy is decreased in SBC Stop Mode because a less

accurate low-power mode regulator is active for very small loads. If the load current on VCC1 exceeds the

selected threshold (IVCC1,Ipeak1,r or IVCC1,Ipeak2,r) then the high-power mode regulator is also activated to support

an optimum dynamic load behavior. The current consumption increases by typ. 2.9mA. The SBC Mode stays

unchanged.

If the load current on VCC1 falls below the selected threshold (IVCC1,Ipeak1,f or IVCC1,Ipeak2,f), then the low-quiescent

current mode is resumed again by disabling the high-power mode regulator.

Both regulators (low-power mode and high-power mode) are active in SBC Normal Mode.

Two different active peak thresholds can be selected via SPI:

• I_PEAK_TH = ‘0’(default): the lower VCC1 active peak threshold 1 is selected with lowest quiescent current

consumption in SBC Stop Mode (IStop_1,25, IStop_1,85);

• I_PEAK_TH = ‘1’: the higher VCC1 active peak threshold 2 is selected with an increased quiescent current

consumption in SBC Stop Mode (IStop_2,25, IStop_2,85);

Table 14

Current Limitation Configurations

SPI Setting

ICC1_LIM_ADJ

Typ. Limitation

Current

Note

‘00’

0.75 A

default value, recommended setting

‘01’

1.0 A

setting for maximum peak load current / large external capacitor values

‘10’

1.2 A

setting not recommended

‘11’

1.5 A

setting not recommended

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