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MAX8643A_0709 Datasheet(PDF) 1 Page - Maxim Integrated Products |
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MAX8643A_0709 Datasheet(HTML) 1 Page - Maxim Integrated Products |
1 / 16 page General Description The MAX8643A high-efficiency switching regulator delivers up to 3A load current at output voltages from 0.6V to (0.9 x VIN).The IC operates from 2.35V to 3.6V, making it ideal for on-board point-of-load and postregu- lation applications. Total output error is less than ±1% over load, line, and temperature. The MAX8643A features fixed-frequency PWM mode operation with a switching frequency range of 500kHz to 2MHz set by an external resistor. High-frequency operation allows for an all-ceramic capacitor design. The high operating frequency also allows for small-size external components. The low-resistance on-chip nMOS switches ensure high efficiency at heavy loads while minimizing critical induc- tances, making the layout a much simpler task with respect to discrete solutions. Following a simple layout and footprint ensures first-pass success in new designs. The MAX8643A comes with a high-bandwidth (> 14MHz) voltage-error amplifier. The voltage-mode control archi- tecture and the voltage-error amplifier permit a type III compensation scheme to be utilized to achieve maxi- mum loop bandwidth, up to 20% of the switching fre- quency. High loop bandwidth provides fast transient response, resulting in less required output capacitance and allowing for all-ceramic capacitor designs. The MAX8643A provides two tri-state logic inputs to select one of nine preset output voltages. The preset output voltages allow customers to achieve ±1% out- put-voltage accuracy without using expensive 0.1% resistors. In addition, the output voltage can be set to any customer value by either using two external resis- tors at the feedback with 0.6V internal reference or applying an external reference voltage to the REFIN input. The MAX8643A offers programmable soft-start time using one capacitor to reduce input inrush current. The MAX8643A is available in a lead-free, 24-pin, 4mm x 4mm thin QFN package. Applications POLs ASIC/CPU/DSP Core and I/O Voltages DDR Power Supplies Base-Station Power Supplies Telecom and Networking Power Supplies RAID Control Power Supplies Features o Internal 37mΩ RDSON MOSFETs o Continuous 3A Output Current o ±1% Output Accuracy Over Load, Line, and Temperature o Operates from 2.35V to 3.6V Supply o Adjustable Output from 0.6V to (0.9 x VIN) o Soft-Start Reduces Inrush Supply Current o 500kHz to 2MHz Adjustable Switching Frequency o Compatible with Ceramic, Polymer, and Electrolytic Output Capacitors o VID-Selectable Output Voltages 0.6, 0.7, 0.8, 1.0, 1.2, 1.5, 1.8, 2.0, and 2.5V o Fully Protected Against Overcurrent and Overtemperature o Safe-Start into Prebiased Output o Sink/Source Current in DDR Applications o Lead-Free, 24-Pin, 4mm x 4mm Thin QFN Package 3A, 2MHz Step-Down Regulator with Integrated Switches _ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ _ Maxim Integrated Products 1 Ordering Information 19-0767; Rev 1; 9/07 For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim's website at www.maxim-ic.com. PART TEMP RANGE PIN-PACKAGE PKG CODE MAX8643AETG+ -40°C to +85°C 24 Thin QFN-EP* (4mm x 4mm) T2444-4 + Denotes a lead-free package. * EP = Exposed pad. Pin Configuration appears at end of data sheet. OUTPUT 1.8V, 3A INPUT 2.4V, 3.6V BST LX OUT IN EN VDD CTL1 CTL2 PGND FB VDD COMP PWRGD FREQ REFIN SS GND PREBIAS MAX8643A Typical Operating Circuit |
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