TPS65510 Datasheet, PDF (1/19 Pages) Texas Instruments – LOW-POWER BATTERY BACKUP IC WITH INTEGRATED BOOST CONVERTER

TPS65510
www.ti.com .......................................................................................................................................................................................... SLLS917 – SEPTEMBER 2008
LOW-POWER BATTERY BACKUP IC
WITH INTEGRATED BOOST CONVERTER
FEATURES
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•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 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.
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Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas
Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
PowerPAD is a trademark of Texas Instruments.
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PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2008, Texas Instruments Incorporated