MAX8556-MAX8557.pdf

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 out- put voltage is adjustable from 0.5V to VIN - 0.2V. Designed with an internal p-channel MOSFET pass tran- sistor, the MAX8556/MAX8557 maintain a low 800μA typi- cal 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 inter- nal charge pump. Other features include a logic-con- trolled shutdown mode, built-in soft-start, short-circuit protection with foldback current limit, and thermal-over- load 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 Servers and Storage Devices Networking Base Stations Optical Modules Point-of-Load Supplies ATE 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 M A X 8 5 5 6 /M A X 8 5 5 7 4A Ultra-Low-Input-Voltage LDO Regulators ________________________________________________________________ Maxim Integrated Products 1 12 11 10 9 5 6 7 EP 8 IN IN OUT OUT TOP VIEW 16 15 14 13 EN + N.C. GND FB 1 2 3 4 ININ ININ MAX8556 (MAX8557) PO K (P OR ) OU T OU T OU T THIN QFN 5mm x 5mm