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Part Number: MAX8557

 

 

 

 

Description: The MAX8556/MAX8557 low-dropout linear regulators operate from input voltages as low as 1.425V and are...


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MAX8557 General Description


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  eatures 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  AX8556/MAX8557 are available in a 16-pin thin QFN 5mm x 5mm package with exposed paddle.

MAX8557 Maximum Ratings

ABSOLUTE MAXIMUM RATINGS
IN, EN, POK, POR to GND .......................................-0.3V to +4V
FB, OUT to GND .........................................-0.3V to (VIN + 0.3V)
Output Short-Circuit Duration...................................Continuous
Continuous Power Dissipation (TA = +70°C)
16-Pin Thin QFN (derate 33.3mW/°C
above +70°C) (Note 1)...............................................2666.7mW
Operating Temperature Range ..........................-40°C to +85°C
Junction Temperature......................................................+150°C
Storage Temperature Range ...........................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C

Stresses beyond those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. These are stress ratings only, and  functionaloperation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied.  xposure to absolute maximum rating conditions for extended periods may affect device reliability.


Note 1: Maximum power dissipation is obtained using JEDEC JESD51-5 and JESD51-7 standards.

MAX8557 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

MAX8557 Typical Application

Servers and Storage Devices
Networking
Base Stations
Optical Modules
Point-of-Load Supplies
ATE

MAX8557 Connection Diagram

MAX8557  Connection Diagram

MAX8557 datasheet

MAX8557
PDF/DataSheet Download

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    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 of MAX8556is adjustable from 0.5V to...

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