TPS65218B1RSLR

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1. Describe

The TPS65218 provides three buck converters, three load switches, three general purpose I/Os, two Battery backup power, a buck-boost converter, and an LDO. The system can be powered by a single battery Li-Ion battery or regulated 5V power supply. The device is characterized over the –40°C to +105°C temperature range, This makes it suitable for various industrial applications. The I2C interface provides comprehensive functionality for using the TPS65218. All rails, load switches and GPIOs are available is enabled and disabled. Voltage thresholds for UVLO and supervisor can be customized. power up and The power-down sequence can also be programmed via I2C. Overheating, Overcurrent and Interruption The load switch (LSx) can be monitored for undervoltage. An integrated voltage supervisor monitors DCDC 1-4 and LDO1. It has two settings; standard only Monitors undervoltage, while tight settings achieve both undervoltage and tight tolerances Overvoltage. A power good signal is provided to report the regulation status of the five power rails. All three hysteretic buck converters can source up to 1.8 A. The default output voltage is Each converter can be adjusted through the I2C interface. DCDC1 and DCDC2 have dynamic voltage scaling with adjustable slew rate. The buck converter operates in a low-power mode at light loads and can For noise sensitive applications, force into power mode (PWM) operation. The backup battery power consists of two low-power buck converters optimized for very light loads, and Use a separate power good signal (PGOOD_BU) for monitoring. The converter can be configured as Always-on power plus a coin cell battery. The status of the battery can be monitored via I2C.

2. Feature

    1. Three adjustable buck converters Integrated switching FETs (DCDC1, DCDC2 and DCDC3):

        – DCDC1: 1.1V default, up to 1.8A

        – DCDC2: 1.1V default, up to 1.8A

        – DCDC3: 1.2V default, up to 1.8A

        – VIN range from 2.7 V to 5.5 V

        – Adjustable output voltage range from 0.85 V to 1.675 V (DCDC1 and DCDC2)

        – Adjustable output voltage range from 0.9 V to 3.4 V (DCDC3)

        – Power saving mode at light load current

        – 100% duty cycle for lowest dropout

        – Active output discharges when disabled

    2. An adjustable buck-boost converter with Integrated switching FET (DCDC4):

        – DCDC4: 3.3V default, up to 1.6A

        – VIN range from 2.7 V to 5.5 V

        – Adjustable output voltage range is 1.175 V to 3.4 V

        – Active output discharges when disabled

    3. Two low quiescent current, high efficiency buck converters for battery backup domain (DCDC5, DCDC6)

        – DCDC5: 1V output

        – DCDC6: 1.8V output

        – VIN range from 2.2 V to 5.5 V

        – Powered by system power or coin cell battery spare battery

    4. Adjustable general purpose LDO (LDO1)

        – LDO1: 1.8V default up to 400mA

        – VIN range is 1.8 V to 5.5 V

        – Adjustable output voltage range from 0.9 V to 3.4V

        – Active output discharges when disabled

    5. Low voltage load switch (LS1) with 350mA current current limit

        – VIN range from 1.2 V to 3.6 V

        – 110 mΩ (max) switch impedance at 1.35 V

    6. 5V load switch (LS2) with 100mA or 500mA Optional current limit

        – VIN range is 4 V to 5.5 V

        – 500mΩ (max) switch impedance at 5V

    7. with 100mA or 500mA selectable current limit

        – VIN range from 1.8 V to 10 V

        – 500mΩ (max) switch impedance

    8. Monitor with built-in monitoring capabilities monitor

        – DCDC1, DCDC2 ±4% tolerance

        – DCDC3, DCDC4 ±5% tolerance

        – LDO1 ±5% tolerance

    9. Protection, diagnosis and control:

        – Under Voltage Lockout (UVLO)

        – Always-on button monitor

        – Overheat warning and shutdown

        – Separate power good outputs for backup and main supplies

        – I2C interface (address 0x24) (see timing requirements for I2C operation at 400 kHz)

3. Application

    1. Human Machine Interface (HMI)

    2. automated industry

    3. Electronic Point of Sale (ePOS)

    4. Test and Measurement

    5. Personal Navigation

4. Pin configuration