TPS56528DDA

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1. Description

The TPS56528DDA device is an adaptive on-time D-CAP2™ mode synchronous buck converter. The TPS56528 enables system designers to complete the suite of various end-equipment power bus regulators with a cost-effective, low component count, low standby current solution. The main control loop for the TPS56528 uses the D-CAP2™ mode control that provides a fast transient response with no external compensation components. The adaptive on-time control supports seamless transition between PWM mode at higher load conditions and advanced EcoMode™ operation at light loads. Advanced EcoMode™ allows the TPS56528 to maintain high efficiency during lighter load conditions. The TPS56528 also has a proprietary circuit that enables the device to adopt to both low equivalent series resistance (ESR) output capacitors, such as POSCAP or SP-CAP, and ultra-low ESR ceramic capacitors. The device operates from 4.5-V to 18-V VIN input. The output voltage can be programmed between 0.6 V and 7 V. The device also features a fixed 1-ms soft-start time and power good output. The TPS56528 is available in the 8-pin SO PowerPAD™ package, and designed to operate from –40°C to 85°C.

2. Features

    1. D-CAP2™ Mode Enables Fast Transient Response

    2. Low Output Ripple and Allows Ceramic Output Capacitor

    3. Wide VIN Input Voltage Range: 4.5 V to 18 V

    4. Output Voltage Range: 0.6 V to 7 V

    5. Highly Efficient Integrated FETs Optimized for Lower Duty Cycle Applications

        – 68 mΩ (High-Side) and 37 mΩ (Low-Side)

    6. High Efficiency, Less Than 10 µA at Shutdown

    7. High Initial Band-Gap Reference Accuracy

    8. Prebiased Soft Start

    9. 650-kHz Switching Frequency (fSW)

  10. Cycle-By-Cycle Overcurrent Limit

  11. Advanced Auto-Skip Eco-Mode™ for High Efficiency at Light Load

  12. Power Good Output

  13. Fixed Soft Start: 1 ms

3. Applications

    1. Wide Range of Applications for Low Voltage Systems

        – Digital TV Power Supply

        – High Definition Blu-ray Disc™ Players

        – Networking Home Terminals

        – Digital Set-Top Boxes (STB)

4. Pin Configuration

5. Pin Functions

6. Application Information

    The TPS56528 is a 4.5-V to 18-V input step-down DC-DC converter with an output voltage adjustable from 0.6 V to 7 V and capable of output currents up to 5 A.