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4A Ultra-Low-Input-Voltage LDO Regulators

Product Details

Key Features

Parametric specs for Linear Regulators
VIN (V) (min) 1.4
VIN (V) (max) 3.6
Adj. VOUT (V) (min) 0.5
Adj. VOUT (V) (max) 3.4
Rated ILOAD (mA) 4000
# Regulators 1
VDROPOUT @Rated ILOAD (V) (typ) 0.1
ICC (µA) (max) 1600
Low Batt./ Pwr. Fail Out No
POK/Reset Thresh. (V) (nom) Vout-10%
Watchdog No
Reverse Batt. Protect. No
Oper. Temp. (°C) -40 to +85
Package/Pins TQFN/16
Budgetary
Price (See Notes)
5.14
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Simplified Block Diagram

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Parameters

Parametric specs for Linear Regulators
VIN (V) (min) 1.4
VIN (V) (max) 3.6
Adj. VOUT (V) (min) 0.5
Adj. VOUT (V) (max) 3.4
Rated ILOAD (mA) 4000
# Regulators 1
VDROPOUT @Rated ILOAD (V) (typ) 0.1
ICC (µA) (max) 1600
Low Batt./ Pwr. Fail Out No
POK/Reset Thresh. (V) (nom) Vout-10%
Watchdog No
Reverse Batt. Protect. No
Oper. Temp. (°C) -40 to +85
Package/Pins TQFN/16
Budgetary
Price (See Notes)
5.14

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

Applications/Uses

  • Automated Test Equipment (ATE)
  • Base Stations
  • Networking
  • Optical Modules
  • Point-of-Load Supplies
  • Servers and Storage Devices

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 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.

Simplified Block Diagram

MAX8556, MAX8557: Typical Operating Circuit MAX8556, MAX8557: Typical Operating Circuit Zoom icon

Technical Docs

Support & Training

Search our knowledge base for answers to your technical questions.

Filtered Search

Our dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal .

Sampling:
Selecting the Sample button above will redirect to the third-party ADI Sample Site. The part selected will carry over to your cart on this site once logged in. Please create a new account there if you have never used the site before. Contact SampleSupport@analog.com with any questions regarding this Sample Site.