Part # MAX8643 datasheet

Part Manufacturer: Maxim


Part Description: MAX8643 DS

Part Details:

19-3970; Rev 3; 9/07 EVALUATION KIT AVAILABLE 3A, 2MHz Step-Down Regulator with Integrated Switches MAX8643 General Description Features The MAX8643 high-efficiency switching regulator deliv- Internal 37m RDSON MOSFETs ers up to 3A load current at output voltages from 0.6V Continuous 3A Output Current to (0.9 x VIN).The IC operates from 2.35V to 3.6V, mak- ing it ideal for on-board point-of-load and postregula- ±1% Output Accuracy Over Load, Line, tion applications. Total output error is less than ±1% and Temperature over load, line, and temperature. Operates from 2.35V to 3.6V Supply The MAX8643 features fixed-frequency PWM mode Adjustable Output from 0.6V to (0.9 x VIN) operation with a switching frequency range of 500kHz Soft-Start Reduces Inrush Supply Current to 2MHz set by an external resistor. High-frequency 500kHz to 2MHz Adjustable Switching Frequency operation allows for an all-ceramic capacitor design.The high operating frequency also allows for small-size Compatible with Ceramic, Polymer, and external components. Electrolytic Output Capacitors The low-resistance on-chip nMOS switches ensure high 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 Fully Protected Against Overcurrent respect to discrete solutions. Following a simple layout and Overtemperature and footprint ensures first-pass success in new designs. Sink/Source Current in DDR Application The MAX8643 comes with a high-bandwidth (> 14MHz) Lead-Free, 24-Pin, 4mm x 4mm voltage-error amplifier. The voltage-mode control archi- Thin QFN Package tecture and the voltage-error amplifier permit a type IIIcompensation 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 transient TEMP PKG response, resulting in less required output capacitance PART PIN-PACKAGE RANGE CODE and allowing for all-ceramic capacitor designs.

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MAX8643.pdf Datasheet