TPS65218B1RSLT

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1. Description

The TPS65218B1RSLT provides three step-down converters, three load switches, three general-purpose I/Os, two battery backup supplies, one buck-boost converter, and one LDO. The system can be supplied by a single cell Li-Ion battery or regulated 5-V supply. The device is characterized across a –40°C to +105°C temperature range, which makes it suitable for various industrial applications. The I2C interface provides comprehensive features for using TPS65218. All rails, load switches , and GPIOs can be enabled and disabled. Voltage thresholds for the UVLO and supervisor can be customized. Power-up and power-down sequences can also be programmed through I2C. Interrupts for overtemperature, overcurrent, and undervoltage can be monitored for the load-switches (LSx). The integrated voltage supervisor monitors DCDC 1-4 and LDO1. It has two settings; the standard settings only monitor for undervoltage, while the strict settings implement tight tolerances on both undervoltage and overvoltage. A power-good signal is provided to report the regulation state of the five rails. The three hysteretic step-down converters can each supply up to 1.8 A of current. The default output voltages for each converter can be adjusted through the I2C interface. DCDC1 and DCDC2 features dynamic voltage scaling with an adjustable slew rate. The step-down converters operate in a low power mode at light load, and can be forced into power mode (PWM) operation for noise sensitive applications. The battery backup supplies consist of two low power step-down converters optimized for very light loads and are monitored with a separate power-good signal (PGOOD_BU). The converters can be configured to operate as always-on supplies with the addition of a coin cell battery. The state of the battery can be monitored over I2C.

2. Features

    1. Three Adjustable Step-Down Converters With Integrated Switching FETs (DCDC1, DCDC2, and DCDC3):

        – DCDC1: 1.1-V Default, up to 1.8 A

        – DCDC2: 1.1-V Default, up to 1.8 A

        – DCDC3: 1.2-V Default, up to 1.8 A

        – VIN Range From 2.7 V to 5.5 V

        – Adjustable Output Voltage Range 0.85 V to 1.675 V (DCDC1 and DCDC2)

        – Adjustable Output Voltage Range 0.9 V to 3.4 V (DCDC3)

        – Power Save Mode at Light Load Current

        – 100% Duty Cycle for Lowest Dropout

        – Active Output-Discharge When Disabled

    2. One Adjustable Buck-Boost Converter With Integrated Switching FETs (DCDC4):

        – DCDC4: 3.3-V Default, up to 1.6 A

        – VIN Range from 2.7 V to 5.5 V

        – Adjustable Output Voltage Range from 1.175 V to 3.4 V

        – Active Output-Discharge When Disabled

    3. Two Low-Quiescent Current, High Efficiency StepDown Converters for Battery Backup Domain (DCDC5, DCDC6)

        – DCDC5: 1-V Output

        – DCDC6: 1.8-V Output

        – VIN Range from 2.2 V to 5.5 V

        – Supplied From System Power or Coin-Cell Backup Battery

    4. Adjustable General-Purpose LDO (LDO1)

        – LDO1: 1.8-V Default up to 400 mA

        – VIN Range from 1.8 V to 5.5 V

        – Adjustable Output Voltage Range from 0.9 V to 3.4 V

        – Active Output-Discharge When Disabled

    5. Low-Voltage Load Switch (LS1) With 350-mA Current Limit

        – VIN Range From 1.2 V to 3.6 V

        – 110-mΩ (Max) Switch Impedance at 1.35 V

    6. 5-V Load Switch (LS2) With 100-mA or 500-mA Selectable Current Limit

        – VIN Range From 4 V to 5.5 V

        – 500-mΩ (Max) Switch Impedance at 5 V

    7. High-Voltage Load Switch (LS3) With 100-mA or 500-mA Selectable Current Limit

        – VIN Range From 1.8 V to 10 V

        – 500-mΩ (Max) Switch Impedance

    8. Supervisor With Built-in Supervisor Function Monitors

        – DCDC1, DCDC2 ±4% Tolerance

        – DCDC3, DCDC4 ±5% Tolerance

        – LDO1 ±5% Tolerance

    9. Protection, Diagnostics, and Control:

        – Undervoltage Lockout (UVLO)

        – Always-on Push-Button Monitor

        – Overtemperature Warning and Shutdown

        – Separate Power-Good Output for Backup and Main Supplies

        – I2C Interface (Address 0x24)

3. Applications

    1. Human-Machine Interface (HMI)

    2. Industrial Automation

    3. Electronic Point of Sale (ePOS)

    4. Test and Measurement

    5. Personal Navigation

4. Pin configuration