MAX8514

19-3178; Rev 0; 2/04 KIT ATION EVALU E L B A AVAIL www.DataSheet4U.com Wide-Input, High-Frequency, Triple-Output Supplies with Voltage Monitor and Power-On Reset General Description The MAX8513/MAX8514 integrate a voltage-mode PWM step-down DC-DC controller and two LDO controllers, a voltage monitor, and a power-on reset for the lowest-cost power-supply and monitoring solution for xDSL modems, routers, gateways, and set-top boxes. The DC-DC controller switching frequency can be set with an external resistor from 300kHz to 1.4MHz, to allow for the optimization of cost, size, and efficiency. For noisesensitive applications, the DC-DC controller can also be synchronized to an external clock, minimizing noise interference. Operation above 1.1MHz reduces noise for high data-rate xDSL applications. An adjustable soft-start and adjustable foldback current limit provide reliable startup and fault protection. The DC-DC controller output voltage can be set externally to a voltage from 1.25V to 5.5V. Current limiting is accomplished by inductor current sensing for improved efficiency, or by an external sense resistor for better accuracy. The MAX8513/MAX8514s’ first LDO controller is designed to provide a low-cost, high-current regulated output from 0.8V to 5.5V using an N-channel MOSFET or a low-current output using a low-cost NPN transistor. The MAX8513’s second regulator can be used to generate 0.8V to 27V output with a low-cost PNP transistor. Both LDO regulators can operate eithe...