TPS53353DQPR Integrated Circuits (ICs)

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1. Describe

The TPS53353DQPR is a D-CAP™ mode, 20A synchronous switch with integrated MOSFETs. It is designed for easy-to-use, low external component count and space-conscious power systems. The device features 5.5-mΩ/2.2-mΩ integrated MOSFETs, an accurate 1%, 0.6-V reference, and an integrated boost switch. Examples of competing features include: 1.5 V to 15 V conversion input voltage range, minimal external component count, D-CAP™ mode control for ultra-fast transients, automatic skip mode operation, internal soft-start control, selectable frequency , without compensation. Converts an input voltage range of 1.5 V to 15 V, a supply voltage range of 4.5 V to 25 V, and an output voltage range of 0.6 V to 5.5 V. The device is 5-mm × 6-mm in a 22-pin QFN package and is specified over the –40°C to 85°C temperature range. The TPS548B28 is an updated 20A device designed for data center applications in a smaller lead-free package.

2. Feature

    1. New Product Availability: TPS548B28 16-V, 20-A Synchronous Buck Converter with Remote Sensing

    2. Convert input voltage range: 1.5 V to 15 V

    3. VDD input voltage range: 4.5 V to 25 V

    4. 92% efficiency from 12 V to 1.5 V at 20 A

    5. Output voltage range: 0.6 V to 5.5 V

    6. 5V LDO output

    7. Supports single track input

    8. Integrated power MOSFET with 20 A continuous output current

    9. Auto-skip Eco-mode™ for light load efficiency

  10. < 10µA Shutdown Current

  11. D-CAP™ mode with fast transient response

  12. Selectable switching frequency from 250 kHz to 1 MHz with external resistor

  13. Selectable auto-skip or PWM-only operation

  14. Built-in 1% 0.6V reference

  15. 0.7-ms, 1.4-ms, 2.8-ms and 5.6-ms selectable internal voltage servo soft-start

  16. Integrated boost switch

  17. Pre-charge startup capability

  18. Adjustable overcurrent limit with thermal compensation

  19. Overvoltage, undervoltage, UVLO and overtemperature protection

  20. Supports all ceramic output capacitors

  21. Open-drain power good indication

  22. Utilizes NexFET™ power block technology

  23. 22-pin QFN package with PowerPAD™

3. Application

    1. Enterprise rack servers and storage

    2. Wired network switches and routers

    3. ASIC, SoC, FPGA, DSP core and I/O voltage

4. Pin configuration

5. Pin Description

6. Feature Description

TPS53353DQPR provides an internal 5V LDO function using input from VDD and output to VREG. The 5V LDO is gated by the EN pin. The LDO starts-up when EN is approximately 1.8V and VDD is approximately 2V. The LDO outputs its voltage to the VREG pin. The VREG voltage provides the bias voltage for the internal analog circuitry and also provides the supply voltage for the gate drives.

7. Application Information

The TPS53353DQPR is a high-efficiency, single channel, synchronous buck converter suitable for low output voltage point-of-load applications in computing and similar digital consumer applications. The device features proprietary D-CAP mode control combined with an adaptive on-time architecture. This combination is ideal for building modern low duty ratio, ultra-fast load step response DC-DC converters. The output voltage ranges from 0.6 V to 5.5 V. The conversion input voltage range is from 1.5 V up to 15 V and the VDD bias voltage is from 4.5 V to 25 V. The D-CAP mode uses the equivalent series resistance (ESR) of the output capacitor(s) to sense the device current. One advantage of this control scheme is that it does not require an external phase compensation network. This allows a simple design with a low external component count. Eight preset switching frequency values can be chosen using a resistor connected from the RF pin to ground or VREG. Adaptive on-time control tracks the preset switching frequency over a wide input and output voltage range while allowing the switching frequency to increase at the step-up of the load.