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
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
titleDownload file
MAX8556-MAX8557 Data SheetMAX8556-MAX8557.pdf
Parametrics
Part NumberRegulatorsVIN
(V)
VIN
(V)
Adj. VOUT
(V)
Adj. VOUT
(V)
VDROPOUT @Rated ILOAD
(V)
Rated ILOAD
(mA)
Rated ILOAD
(mA)
ICC
(µA)
Low Batt./ Pwr. Fail OutPOK/Reset Thresh.
(V)
WatchdogReverse Batt. Protect.Oper. Temp.
(°C)
Package/PinsBudgetary
Price
minmaxminmaxtypmaxnomSee Notes
MAX855611.43.60.53.40.1400040001600NoVout-10%NoNo-40 to +85TQFN/16$3.91 @1k
MAX8557TQFN/16
Design kits & evaluation modules
Quality and Environmental Data
Related Products
  • MAX8516:1.425V to 3.6V Input, 1A, 0.2V Dropout LDO Regulators
Ordering Information
Part NumberStatusRecommended ReplacementPackageTempRoHS
MAX8557ETENo Longer AvailableMAX8557ETE+TQFN,;16 pin;26 mm²-40°C to +85°CNo
MAX8557ETE+ActiveTQFN,;16 pin;26 mm²-40°C to +85°CLead Free
MAX8557ETE+TActiveTQFN,;16 pin;26 mm²-40°C to +85°CLead Free
MAX8557ETE-TNo Longer AvailableMAX8557ETE+TTQFN,;16 pin;26 mm²-40°C to +85°CNo
MAX8556-MAX8557.pdf MAX8557
Power-Supply Solutions for Altera FPGAs MAX17040
Power-Supply Solutions for Xilinx FPGAs MAX17040
MAX8557.pdf MAX8557
典型工作电路 MAX8557