TPS53355DQPR Integrated Circuits (ICs)

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1. Describe

The TPS53355DQPR is a D-CAP™ mode, 30A synchronous switch with integrated MOSFETs. It is designed for easy-to-use, low external component count and space-conscious power systems. The device features 5mΩ/2mΩ integrated MOSFETs, an accurate 1% 0.6V reference, and an integrated boost switch. Examples of competing features include: wide conversion input voltage range of 1.5V to 15V, minimal external component count, DCAP™ mode control for ultra-fast transients, automatic skip mode operation, internal soft-start control, selectable frequency, and no Compensation is required. 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 size is 6-mm × 5-mm in a 22-pin QFN package. The LMZ31530 integrates the TPS53355, inductor, and other passive components into a small, easy-to use module.

2. Feature

    1. Alternatives available: LMZ31530 14.5V, 30A step-down power module in 15 × 16 × 5.8-mm QFN package

    2. 96% maximum efficiency

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

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

    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 30 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™

  24. Green (RoHS Compliant) is optional

  25. Create custom designs using TPS53355 with WEBENCH® Power Designer

3. Application

    1. Enterprise 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. Application Information

The TPS53355DQPR 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.