MAX8556

PRODUCTION

4A Ultra-Low-Input-Voltage LDO Regulators

Data Sheet (Rev. 3) Product Selection Table
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Overview

  • 1.425V to 3.6V Input Voltage Range
  • Guaranteed 4A Output Current
  • ±1% Output Accuracy Over Load/Line/Temperature
  • 100mV Dropout at 4A Load (typ)
  • Built-In Soft-Start
  • 800µA (typ) Operating Supply Current
  • 150µA (max) Shutdown Supply Current
  • Short-Circuit Current Foldback Protection
  • Thermal-Overload Protection
  • ±10% Power-OK (MAX8556)
  • 140ms Power-On Reset Output (MAX8557)
  • Fast Transient Response
  • 16-Pin Thin QFN (5mm x 5mm) Package

The MAX8556/MAX8557 low-dropout linear regulators operate from input voltages as low as 1.425V and are able to deliver up to 4A of continuous output current with a typical dropout voltage of only 100mV. The output voltage is adjustable from 0.5V to VIN - 0.2V.

Designed with an internal p-channel MOSFET pass transistor, the MAX8556/MAX8557 maintain a low 800µA typical supply current, independent of the load current and dropout voltage. Using a p-channel MOSFET eliminates the need for an additional external supply or a noisy internal charge pump. Other features include a logic-controlled shutdown mode, built-in soft-start, short-circuit protection with foldback current limit, and thermal-overload protection. The MAX8556 features a POK output that transitions high when the regulator output is within ±10% of its nominal output voltage. The MAX8557 offers a power-on reset output that transitions high 140ms after the output has achieved 90% of its nominal output voltage.

The MAX8556/MAX8557 are available in a 16-pin thin QFN 5mm x 5mm package with exposed paddle.

Applications

  • Automated Test Equipment (ATE)
  • Base Stations
  • Networking
  • Optical Modules
  • Point-of-Load Supplies
  • Servers and Storage Devices
MAX8556
4A Ultra-Low-Input-Voltage LDO Regulators
MAX8556, MAX8557: Typical Operating Circuit
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Documentation

Data Sheet 1

Reliability Data 1

Technical Articles 3

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Software Resources

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Hardware Ecosystem

Parts Product Life Cycle Description
LDO Linear Regulators 1
MAX8516
PRODUCTION 1.425V to 3.6V Input, 1A, 0.2V Dropout LDO Regulators
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Evaluation Kits

MAX8556EVKIT

Evaluation for the MAX8556

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Features and Benefits

  • 1.425V to 3.6V Input Voltage Range
  • 1.2V Output Voltage
  • Up to 4A Output Current
  • Low Dropout Voltage (200mV max at 4A)
  • Internal p-Channel MOSFET Pass Transistor
  • Power-OK (POK) Output
  • Fully Assembled and Tested

    • Product Details

    The MAX8556 evaluation kit (EV kit) is a fully assembled and tested surface-mount circuit board demonstrating the MAX8556 low-dropout (LDO) regulator. The EV kit comes assembled with a MAX8556ETE circuit that steps down a 1.425V to 3.6V input voltage range to a 1.2V output capable of sourcing up to 4A (limited by power dissipation). The MAX8556 features a POK output that goes high impedance once the output is within ±10% of its regulation value. The device utilizes an internal p-channel MOSFET for reduced dropout and quiescent current. In addition, the p-channel MOSFET eliminates the need for an external bias or noisy charge pump. The MAX8556 EV kit can also be used to evaluate the MAX8557 with no component changes.

    Applications

    • Automated Test Equipment (ATE)
    • Networking
    • Optical Modules
    • Point-of-Load Supplies
    • Servers and Storage Devices
    • Wireless Base Stations
    MAX8556EVKIT
    Evaluation for the MAX8556

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