The MAX8855 high-efficiency, dual step-down regulator is capable of delivering up to 5A 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 MAX8855 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 systemlevel designs. A reference input is provided to facilitate output-voltage tracking applications. The MAX8855 is available in a 32-pin thin QFN (5mm x 5mm) package with 0.8mm max height.
Key Features
Applications/Uses
27mΩ On-Resistance Internal MOSFETs
Dual, 5A, 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
* Some packages have variations, listed on the drawing. "PkgCode/Variation" tells which variation the product uses. Note that "+", "#", "-" in the part number suffix describes RoHS status. Package drawings may show a different suffix character.
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MAX8855
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TYPE PINS FOOTPRINT
DRAWING CODE/VAR *
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RoHS/Lead-Free? Materials Analysis
MAX8855EVKIT+
Active
Land Pattern: Not Available
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MAX8855ETJ+T
Active
TQFN;32 pin;26 mm²
Outline Drawing: 21-0140 (PDF)
Land Pattern: 90-0012 (PDF)
Use pkgcode/variation: T3255+4*
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