1FEATURES
2· 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

DESCRIPTION
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 mA (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.