TLE9263QX datasheet(49/164 Pages) INFINEON

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Data Sheet

Rev. 1.1, 2014-09-26

TLE9263QX

External Voltage Regulator 3

8.2

Functional Description

The external voltage regulator can be used as an independent voltage regulator or in load-sharing mode with

VCC1. Setting VCC3_ON in the M_S_CTRL register in SBC Normal Mode sets the stand-alone configuration of

VCC3 as an independent voltage regulator. The load sharing configuration is set via the SPI bit VCC3_LS in the

HW_CTRL register.

Figure 18

Selecting the Configuration of the VCC3 Regulator

Depending on the configuration the regulator will act in the respective SBC Mode as described in Table 12. After

the VCC3 configuration has been selected, it cannot be changed anymore.

In stand-alone configuration the maximum current ICC3max is defined by the current limitation determined by the

used shunt. In load sharing configuration, the shunt is used to determine the current ratio between VCC1 and

VCC3. Since the junction temperature of the external PNP transistor cannot be sensed by the SBC, it cannot be

protected against over temperature by the SBC. Therefore the thermal behavior has to be analyzed by the

application.

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

power mode regulator with a lower accuracy will be active for small loads. If the base current on VCC3 exceeds

VCC3base > IVCC3base,Ipeak,r then the high-power mode regulator is enabled additionally to support an optimum

dynamic load behavior. If the base current on VCC3 falls below the threshold (

VCC3base < IVCC3base,Ipeak,f), then the

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

Only the high-power mode regulator is active in SBC Normal Mode.

The status of VCC3 is reported in the SUP_STAT_2 SPI register. The regulator will switch OFF in case of VS

dropping below VS_UV regardless of the VCC3 configuration and will be automatically enabled again when

exceeding this threshold voltage unless the control bit VCC3_VS_ UV_OFF is set. VCC3 will also stay active in

SBC Stop Mode when the bit VCC3_LS_ STP_ON is set and when load sharing is configured (for detailed

protection features see Chapter 15.7 and Chapter 16.3).

Set bit

VCC3_V_CFG = 0

Set bit

VCC3_ON = 0 or 1

Set bit

VCC3_LS = 1

VCC3_V_CFG is

automatically set to 0

VCC3_LS, VCC3_ON and

VCC3_V_CFG cannot be

changed anymore

VCC3_LS and VCC3_V_CFG

cannot be changed anymore

(once VCC3_ON is set for the first time)

VCC3

load sharing?

Default value of

VCC3_LS = ‘0'

VCC3

output voltage

in stand-alone

configuration

Set bit

VCC3_V_CFG = 1

Set bit

VCC3_ON = 0 or 1

stand-alone

configuration

VCC3 = 5V

stand-alone

configuration

VCC3 = 3.3V

VCC3 load sharing

VCC3 = VCC1

Yes

5.0V

3.3V

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