Part # MAX8643A datasheet

Part Manufacturer: Maxim


Part Description: MAX8643A DS

Part Details:

19-0767; Rev 1; 9/07 3A, 2MHz Step-Down Regulator with Integrated Switches MAX8643A General Description Features The MAX8643A high-efficiency switching regulator o Internal 37m RDSON MOSFETs delivers up to 3A load current at output voltages from o Continuous 3A Output Current 0.6V to (0.9 x VIN).The IC operates from 2.35V to 3.6V, o making it ideal for on-board point-of-load and postregu- ±1% Output Accuracy Over Load, Line, lation applications. Total output error is less than ±1% and Temperature over load, line, and temperature. o Operates from 2.35V to 3.6V Supply The MAX8643A features fixed-frequency PWM mode o Adjustable Output from 0.6V to (0.9 x VIN) operation with a switching frequency range of 500kHz o Soft-Start Reduces Inrush Supply Current to 2MHz set by an external resistor. High-frequency o 500kHz to 2MHz Adjustable Switching Frequency operation allows for an all-ceramic capacitor design.The high operating frequency also allows for small-size o Compatible with Ceramic, Polymer, and external components. Electrolytic Output Capacitors The low-resistance on-chip nMOS switches ensure high o VID-Selectable Output Voltages efficiency at heavy loads while minimizing critical induc- 0.6, 0.7, 0.8, 1.0, 1.2, 1.5, 1.8, 2.0, and 2.5V tances, making the layout a much simpler task with o Fully Protected Against Overcurrent respect to discrete solutions. Following a simple layout and Overtemperature and footprint ensures first-pass success in new designs. o Safe-Start into Prebiased Output The MAX8643A comes with a high-bandwidth (> 14MHz) o Sink/Source Current in DDR Applications voltage-error amplifier. The voltage-mode control archi- o tecture and the voltage-error amplifier permit a type III Lead-Free, 24-Pin, 4mm x 4mm Thin QFN Package compensation scheme to be utilized to achieve maxi-mum loop bandwidth, up to 20% of the switching fre- Ordering Information quency. High loop bandwidth provides fast transientresponse, resulting in less required output capacitance PKG PART TEMP RANGE PIN-PACKAGE CODE and allowing for all-ceramic capacitor designs. The MAX8643A provides two tri-state logic inputs to 24 Thin QFN-EP*

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MAX8643A.pdf Datasheet