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L9678P bảng dữ liệu(PDF) 31 Page - STMicroelectronics

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L9678P bảng dữ liệu(HTML) 31 Page - STMicroelectronics

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L9678P, L9678P-S
Start-up power control
202
4.3.4
VDD5 linear regulator
The VDD5 linear regulator provides 5 V system voltage derived directly from battery line
with an external power transistor to reduce integrated circuit power dissipation. This voltage
rail is used in case a 5 V micro-controller is adopted. The stability of the regulation loop is
guaranteed by use of a small external capacitor. Current limitation is provided by means of
controlling output current on BVDD5 pin. The external pass transistor gives the flexibility to
easily address different current loads in case of different micro-controllers. The VDD5
regulator is enabled in the ACTIVE mode and continues operation in the PASSIVE mode
using power from energy reserve. VDD5 supply is monitored for system reset (see Power
On Reset and Reset in Section 4.4); voltage monitoring is based on a second redundant
bandgap voltage reference.
Figure 14. VDD5 control behavior



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