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MAX8557：4A Ultra-Low-Input-Voltage LDO Regulators

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.

Key Features 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

MAX8556, MAX8557: Typical Operating Circuit Applications/Uses Automated Test Equipment (ATE) Networking Optical Modules Point-of-Load Supplies Servers and Storage Devices Wireless Base Stations

DataSheet

Parametrics

Design kits & evaluation modules

• MAX8556EVKIT

Quality and Environmental Data

• MAX8557.pdf

Related Products

• MAX8516：1.425V to 3.6V Input, 1A, 0.2V Dropout LDO Regulators

Ordering Information