General Description

The MAX8563/MAX8564/MAX8564A ultra-low-output dual and triple LDO controllers allow flexible and inexpensive point-of-load voltage conversion in motherboards, desknotes, notebooks, and other applications.

These parts feature a 0.5V reference voltage with ±1 accuracy providing tight regulation of the output voltage. The MAX8563 has three n-channel MOSFET controller outputs, and the MAX8564/MAX8564A has two controller outputs.

Each controller output is adjustable from 0.5V to 3.3V when VDD = 12V and between 0.5V and 1.8V when VDD = 5V. Each output is independently enabled and asserts a POK signal when the output reaches 94 of the set value. Each output is protected against a soft short-circuit condition by an undervoltage comparator that disables the output when it drops to under 80 of the set voltage for more than 50μs. For a catastrophic short condition, the regulators are shut down immediately if the output drops below 60 of the set voltage.

The MAX8563 is available in a 16-pin QSOP package, and the MAX8564/MAX8564A are available in a 10-pin μMAX? package.

Features

? MAX8563: 3 Outputs

? MAX8564/MAX8564A: 2 Outputs

? ±1 Feedback Regulation

? Adjustable Output Voltage Down to 0.5V

? Can Use Ceramic Output Capacitors

? Wide Supply Voltage Range Permits Operation from 5V or 12V Rails

? Individual Enable Control and POK Signal Allows Sequencing

? Overload Protection Against Soft Short-Circuit Condition

? Undervoltage Short-Circuit Protection

? Drive n-Channel MOSFETs

Applications

?? Motherboards

?? Dual/Triple Power Supplies

?? Desknotes and Notebooks

?? Graphic Cards

?? Ultra-Low-Dropout

?? Voltage Regulators

?? Low-Voltage DSP, μP, and Microcontroller Power Supplies