MAX8737

MAX8737 19-3705; Rev 0; 5/05 EVAALVUAAILTAIOBNLEKIT Dual, Low-Voltage Linear Regulator Controllers with External MOSFETs General Description The MAX8737 dual high-power linear regulator controllers use external n-channel MOSFETs to generate two independent low-voltage supplies for notebook computers. The MAX8737 delivers low output voltages from 0.5V to 2.5V (±5mV no-load accuracy). The external components allow scalable current design with loads up to 5A with excellent load regulation (1%). The regulator operates from a low input voltage, which also reduces the power dissipation in the external n-channel MOSFET. The controller powers the external MOSFET gate driver from the standard 5V system supply. The MAX8737 includes current and thermal limits to prevent damage to the linear regulator. The MAX8737 uses an external resistive divider to fold back the current limit, reducing the overall power dissipation. The MAX8737 uses an external resistive-divider in series with the current-sense input (CS_), providing foldback current-limit protection, and effectively reducing the short-circuit power dissipation. An output undervoltage timeout is available for low-cost applications that omit the current-sense resistor. The output undervoltage (UVP) timing depends on the magnitude of the voltage at VOUT. The UVP detects and shuts down the LDO if the output voltage drops out of regulation. The controller uses an adjustable reference input (REFIN_) to set the nominal output voltage (V...