MP1584EN-LF

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Description

The MP1584 is a high-frequency step-down switching regulator with an integrated high-side high-voltage power MOSFET. It provides 3A output and uses current mode control for fast loop response and easy compensation. The wide input range of 4.5V to 28V is suitable for a variety of step-down applications, including automotive input environments. The 100µA quiescent operating current enables it to be used in battery-powered applications. High power conversion efficiency is achieved over a wide load range by reducing switching frequency under light load conditions, thereby reducing switching and gate drive losses. The frequency foldback function helps prevent inductor current runaway during startup and thermal shutdown, providing reliable, fault-tolerant operation. By switching at 1.5MHz, the MP1584 is able to prevent EMI (electromagnetic interference) noise issues, such as those commonly seen in AM radio and ADSL applications. The MP1584 is available in a thermally enhanced SOIC8E package.

Features

   1. 4.5V to 28V wide operating input range

   2. 100kHz to 1.5MHz programmable switching frequency

   3. Light load high efficiency pulse skipping mode

   4. Ceramic capacitor stable

   5. Internal soft start

   6. Internally set current limit, no current sense resistor required

   7. Available in SOIC8E package.

Applications

   1. High voltage power conversion

   2. Automotive systems

   3. Industrial power systems

   4. Distributed power systems

   5. Battery-powered systems

Pin definition (SOIC-8 EP)

Typical application circuit

   +───────╮

  Vin ────┤ IN    │

                  │         │ SW ──┬─▶ Inductor (10μH) ──▶ Vout

  GND ──┤ GND   │            │

                  │          │           └─▶ Schottky diode (optional)

     FB ──┤ FB       │                   +────┐

                  │          │                              │

   EN ──┤ EN    │                            C1 100μF

           +───────╯                               │

            ▲ 0.1μF                                     │

            │(BS-SW)                                 │

            ▼                                             ▼

           GND                                        GND

Design calculation formula

      1. Output voltage setting:

                          Vout = 0.8V × (1 + R1/R2)

                          Recommended R2=10kΩ, R1=(Vout/0.8-1)×10k

      2. Inductor selection:

                          L ≥ (Vin_max - Vout) × Vout / (Vin_max × ΔIL × fsw)

                          Typical value: 4.7-22μH (saturation current>4A)

Layout guide

   1. Power loop minimization:

       - Input capacitor → IC → inductor → output capacitor forms a loop of <1cm²

   2. Thermal management:

       - Use 2oz copper foil + 4×4 heat dissipation via array on the bottom layer

   3. Noise suppression:

       - FB routing should be away from SW node, and shielding ground wire should be added if necessary

Common Problem Solving

   1. Output voltage is unstable:

       - Check the layout of FB voltage divider resistor (away from noise source)

       - Add 10-100pF compensation capacitor in parallel with R1

   2. Chip overheating:

       - Confirm that the inductor DCR is <50mΩ

       - Check whether the input voltage exceeds the derating curve

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