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MAX8833: Dual, 3A, 2MHz Step-Down Regulator Data Sheet (Rev. 2)12/22/2009PDF362K
MAX8833
Dual, 3A, 2MHz Step-Down Regulator
Smallest, Most Efficient, Dual 3A Regulator with Integrated Switches in 5mm × 5mm TQFN Package
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Overview
Features and Benefits
- 35mΩ On-Resistance Internal MOSFETs
- Dual, 3A, PWM Step-Down Regulators
- Fully Protected Against Overcurrent, Short Circuit, and Overtemperature
- ±1% Output Accuracy over Load, Line, and Temperature
- Operates from 2.35V to 3.6V Supply
- REFIN on One Channel for Tracking or External Reference
- Integrated Boost Diodes
- Adjustable Output from 0.6V to 0.9 x VIN
- Soft-Start Reduces Inrush Supply Current
- 0.5MHz to 2MHz Adjustable Switching, or FSYNC Input
- All-Ceramic-Capacitor Design
- 180° Out-of-Phase Operation Reduces Input Ripple Current
- Individual Enable Inputs and PWRGD Outputs
- Safe-Start into Prebiased Output
- Available in 5mm x 5mm Thin QFN Package
- Sink/Source Current in DDR Applications
Product Details
The MAX8833 high-efficiency, dual step-down regulator is capable of delivering up to 3A at each output. The device operates from a 2.35V to 3.6V supply, and provides output voltages from 0.6V to 0.9 x VIN, making it ideal for on-board point-of-load applications. Total output error is less than ±1% over load, line, and temperature.
The MAX8833 operates in PWM mode with a switching frequency ranging from 0.5MHz to 2MHz, set by an external resistor. It can also be synchronized to an external clock in the same frequency range. Two internal switching regulators operate 180° out-of-phase to reduce the input ripple current, and consequently reduce the required input capacitance. The high operating frequency minimizes the size of external components. High efficiency, internal dual-nMOS design keeps the board cool under heavy loads. The voltage-mode control architecture and the high-bandwidth (> 15MHz typ) voltage-error amplifier allow a type III compensation scheme to be utilized to achieve fast response under both line and load transients, and also allow for ceramic output capacitors.
Programmable soft-start reduces input inrush current. Two enable inputs allow the turning on/off of each output individually, resulting in great flexibility for system-level designs. A reference input is provided to facilitate output-voltage tracking applications. The MAX8833 is available in a 32-pin thin QFN (5mm x 5mm) package with 0.8mm max height.
Applications
- ASIC/CPU/DSP Power Supplies
- DDR Power Supplies
- Network Power Supplies
- Printer Power Supplies
- Set-Top Box Power Supplies
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Product Lifecycle
Production
At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.
Documentation & Resources
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UG-5861: EE-SIM Design and Simulation Environment User Guide5/5/2014PDF3M
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Power-Supply Solutions for Altera FPGAs4/24/2012
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Power-Supply Solutions for Xilinx FPGAs4/24/2012
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The EE-Sim DC-DC Converter Tool uses your requirements to quickly create a complete power design including a schematic, BOM with commercially available parts, and time and frequency domain simulations. Your customized schematic can be downloaded for further analysis in the standalone EE-Sim OASIS Simulator, featuring SIMPLIS and SIMetrix SPICE engines.
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