The TPS65510 offers a suitable solution for power switch to select the main battery or the backup battery.

This device automatically selects the power path. It depends on the voltage level of the VO_BT pin. When the main battery is removed, the power path of the VOUT pin is automatically changed from the output of 3.3-V low droppout (LDO) voltage regulator to the backup battery.

The backup battery is charged from the power path of the VRO pin (output of 3.3-V LDO) via an external diode and resistor. The input of the LDO voltage regulator comes from the internal boost converter.

The 1.2-V output LDO and 1.8-V output LDO voltage regulators have a enable pin, V_CTRL. If these outputs are not necessary, V_CTRL should be connected to AGND to save power consumption. The self-power consumption is less than 3 µA (maximum) using the backup battery.

This device has two indicators. One is CS, which monitors the voltage level of the VBAT pin and VO_BT pin. The other is XRESET, which monitors voltage level of the VOUT pin. These indicators should be connected to CPU/DSP to reset them.

This device reduces the total solution area and extends the lifetime of the backup battery.

• Power-Path Switch to Select Main Battery or Backup Battery for Real-Time Clock (RTC)
• Integrated Boost DC/DC Converter
  • Modulation Select by Control Pin (PWMON), Pulse Frequency Modulation (PFM) or Pulse Width Modulation (PWM)
  • Fixed Switching Frequency (PWM, 750 kHz)
  • Peak Current Mode Control (PWM)
  • Low Power Consumption (PFM)
• Four Integrated Low Dropout (LDO) Voltage Regulators for 1.2 V/1.8 V/3.3 V
• Two Integrated Indicators
  • CS: Monitors the Voltage Level of Main Battery (VBAT) and Output voltage level of Boost Converter (VO_BT)
  • XRESET: Monitors the Output voltage Level of 3.3V LDO (VOUT)
• 16-Pin QFN (3mm × 3mm) Package
• Operating Temperature 35°C to 85°C
• Protection
  • Overcurrent Protection (OCP)
  • Overvoltage Protection (OVP)
  • Thermal Shutdown (TSD)
  • Undervoltage Lockout (UVLO)
• APPLICATIONS
  • Digital Still Cameras
  • Portable Systems With Backup Battery

PowerPAD Is a trademark of Texas Instruments.

• Regulated outputs (#)
• 5
• Vin (Min) (V)
• 2.65
• Vin (Max) (V)
• 5.5
• Iout (Max) (A)
• 1.2
• Rating
• Catalog
• LDO
• 4
• Iq (Typ) (mA)
• 0.25
• Features
• Over Current Protection, Thermal Shutdown, UVLO Fixed
• Processor name
• Generic
• Processor supplier
• Generic
• Shutdown current (ISD) (Typ) (uA)
• 60
• Switching frequency (Typ) (kHz)
• 750
• Configurability
• Hardware configurable, User programmable

TPS65510的完整型号有：TPS65510RGTR、TPS65510RGTT，以下是这些产品的关键参数及官网采购报价：

TPS65510RGTR，工作温度：-35 to 85，封装：VQFN (RGT)-16，包装数量MPQ：3000个，MSL 等级/回流焊峰值温度：Level-2-260C-1 YEAR，引脚镀层/焊球材料：NIPDAU，TI官网TPS65510RGTR的批量USD价格：1.32（1000+）

TPS65510RGTT，工作温度：-35 to 85，封装：VQFN (RGT)-16，包装数量MPQ：250个，MSL 等级/回流焊峰值温度：Level-2-260C-1 YEAR，引脚镀层/焊球材料：NIPDAU，TI官网TPS65510RGTT的批量USD价格：1.584（1000+）