ZHCSDX3F June 2015 – September 2021 TPS61098 , TPS610981 , TPS610982 , TPS610985 , TPS610986 , TPS610987
PRODUCTION DATA
- 1 特性
- 2 應用
- 3 說明
- 4 Revision History
- 5 Device Comparison Table
- 6 Pin Configuration and Functions
- 7 Specifications
- 8 Detailed Description
- 9 Applications and Implementation
- 10Power Supply Recommendations
- 11Layout
- 12Device and Documentation Support
- 13Mechanical, Packaging, and Orderable Information
9.2.3 VSUB to Power the System in Active Mode
In some applications, the system controller can be powered by the battery directly, but a buck-boost or a boost converter with an LDO is needed to provide a quiet power supply for a subsystem like a sensor. In this type of application, the TPS61098x can be used to replace the discrete boost converter and the LDO, providing a compact solution to simplify the system design and save the PCB space. The LDO can be turned on and off by the MODE pin. When the MODE pin is pulled low, the LDO is turned off to disconnect the load, and the TPS61098x also enters into Low Power mode to save power consumption. Figure 9-29 shows an application where the VSUB of the TPS61098 is used to supply the 3.1 V for a sensor in a system. The boost converter of the TPS61098 outputs 4.3 V and provides enough headroom for the LDO operation.
Figure 9-29 Typical Application of TPS61098 VSUB to Power the System in Active Mode