Dual, Low-Voltage Linear-Regulator Controller Drives External MOSFETS to Provide Scalable Current Design
SUNNYVALE, CA-June 6, 2005-Maxim Integrated Products (NASDAQ: MXIM) introduces the MAX8737, a dual, high-power, linear-regulator controller used with external n-channel MOSFETs to generate two independent low-voltage supplies for notebook computers. The regulator delivers low output voltages from 0.5V to 2.5V, and the external MOSFETs allow scalable current design with highly regulated (1%) loads up to 5A.
The MAX8737 operates from a low input voltage, which also reduces the power dissipation in the external n-channel MOSFETs. An external resistive divider is used to fold back the current limit, thereby reducing the overall power dissipation. An output undervoltage timeout is included for low-cost applications that omit the current-sense resistor. The linear regulator features an adjustable soft-start function, and generates a delayed power-good signal that indicates when the MAX8737 is in regulation. Current and thermal limits prevent damage to the device.
The MAX8737 is screened for the extended-industrial temperature range (-40 degrees Celsius to +85 degrees Celsius), and is available in a small, 16-pin, 4mm x 4mm TQFN package. Pricing starts at $1.29 (1000-up, FOB USA). A preassembled MAX8737EVKIT with recommended external components is available to reduce design time.
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