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MAX8855 Dataheets PDF



Part Number MAX8855
Manufacturers Maxim
Logo Maxim
Description 2MHz Step-Down Regulators
Datasheet MAX8855 DatasheetMAX8855 Datasheet (PDF)

19-0726; Rev 4; 10/11 KIT ATION EVALU E L B AVAILA Dual, 5A, 2MHz Step-Down Regulators General Description Features o 27mΩ On-Resistance Internal MOSFETs o Dual, 5A, PWM Step-Down Regulators o Fully Protected Against Overcurrent, Short Circuit, and Overtemperature o ±1% Output Accuracy Over Load, Line, and Temperature o Operates from 2.25V to 3.6V Supply o REFIN on One Channel for Tracking or External Reference o Integrated Boost Diodes o Adjustable Output from 0.6V to 0.9 x VIN o Soft-Start R.

  MAX8855   MAX8855


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19-0726; Rev 4; 10/11 KIT ATION EVALU E L B AVAILA Dual, 5A, 2MHz Step-Down Regulators General Description Features o 27mΩ On-Resistance Internal MOSFETs o Dual, 5A, PWM Step-Down Regulators o Fully Protected Against Overcurrent, Short Circuit, and Overtemperature o ±1% Output Accuracy Over Load, Line, and Temperature o Operates from 2.25V to 3.6V Supply o REFIN on One Channel for Tracking or External Reference o Integrated Boost Diodes o Adjustable Output from 0.6V to 0.9 x VIN o Soft-Start Reduces Inrush Supply Current o 0.5MHz to 2MHz Adjustable Switching, or FSYNC Input o All-Ceramic-Capacitor Design o 180° Out-of-Phase Operation Reduces Input Ripple Current o Individual Enable Inputs and PWRGD Outputs o Safe-Start into Prebiased Output o Available in 5mm x 5mm Thin QFN Package o Sink/Source Current in DDR Applications MAX8855/MAX8855A The MAX8855/MAX8855A high-efficiency, dual step-down regulators are capable of delivering up to 5A at each output. The devices operate from a 2.25V to 3.6V supply, and provide output voltages from 0.6V to 0.9 x VIN, making them ideal for on-board point-of-load applications. Total output error is less than ±1% over load, line, and temperature. The MAX8855/MAX8855A operate 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/ MAX8855A are available in a 32-pin TQFN (5mm x 5mm) package with 0.8mm max height. Ordering Information PART MAX8855ETJ+ MAX8855AETJ+ TEMP RANGE -40°C to +85°C -40°C to +85°C PIN-PACKAGE 32 TQFN-EP* 32 TQFN-EP* Applications ASIC/CPU/DSP Power Supplies DDR Power Supplies Set-Top Box Power Supplies Printer Power Supplies Network Power Supplies +Denotes a lead(Pb)-free/RoHS-compliant package. *EP = Exposed pad. Typical Operating Circuit INPUT1 2.25V TO 3.6V IN1 IN2 BST1 BST2 LX1 LX2 INPUT2 2.25V TO 3.6V OUTPUT1 1.2V / 5A OUTPUT2 1.5V / 5A PGND1 PGND2 MAX8855/ MAX8855A FB1 FB2 COMP1 TYPE III COMPENSATION COMP2 TYPE III COMPENSATION PWRGD1 PWRGD2 ON OFF EN1 GND EN2 OFF ON Pin Configuration appears at end of data sheet. ________________________________________________________________ Maxim Integrated Products 1 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. Free Datasheet http://www.datasheet-pdf.com/ Dual, 5A, 2MHz Step-Down Regulators MAX8855/MAX8855A ABSOLUTE MAXIMUM RATINGS IN_, LX_, VDD, VDL, PWRGD_ to GND..................-0.3V to +4.5V VDD, VDL to IN_.....................................................-0.3V to +4.5V EN_, SS_, COMP_, FB_, REFIN, FSYNC to GND ......-0.3V to the lower of (VVDD + 0.3V) and (VVDL + 0.3V) Continuous LX_ Current (Note 1) ...................................5.5ARMS BST_ to LX_ ...........................................................-0.3V to +4.5V PGND_ to GND......................................................-0.3V to +0.3V Continuous Power Dissipation (TA = +70°C) 32-Pin TQFN (5mm x 5mm) (derate 34.5mW/°C above +70°C) ..........................2758.6mW Operating Ambient Temperature Range .............-40°C to +85°C Operating Junction Temperature Range ...........-40°C to +125°C Storage Temperature Range .............................-65°C to +150°C Lead Temperature (soldering, 10s) .................................+300°C Soldering Temperature (reflow) .......................................+260°C Note 1: LX_ have internal clamp diodes to PGND_ and IN_. Applications that forward bias these diodes should take care not to exceed the IC’s package power-dissipation limits. Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. PACKAGE THERMAL CHARACTERISTICS (Note 2) TQFN Junction-to-Ambient Thermal Resistance (θJA) ...........29°C/W.


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