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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.