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MAX17020ETJ+ Datasheet(PDF) 1 Page - Maxim Integrated Products |
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MAX17020ETJ+ Datasheet(HTML) 1 Page - Maxim Integrated Products |
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1 / 34 page  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. Dual Quick-PWM Step-Down Controller with Low-Power LDO, RTC Regulator ________________________________________________________________ Maxim Integrated Products 1 Ordering Information 19-4118; Rev 2; 2/09 o o o o o o o o o o o o o o o General Description The MAX17020 is a dual Quick-PWM™ step-down power-supply (SMPS) controller with synchronous rec- tification, intended for main 5V/3.3V or I/O 1.5V/1.05V power generation in battery-powered systems. Low- side MOSFET sensing provides a simple low-cost, highly efficient current sense for valley current-limit protection. Combined with the output overvoltage and undervoltage protection features, this current limit ensures robust output supplies. The 5V/3.3V or 1.5V/1.05V SMPS outputs can save power by operating in pulse-skipping mode or in ultra- sonic mode to avoid audible noise. Ultrasonic mode forces the controller to maintain switching frequencies greater than 20kHz at light loads. An internal 100mA linear regulator can be used to either generate the 5V bias needed for power-up or other lower power “always-on” suspend supplies. An independent bypass input allows automatic bypassing of the linear regulator when the SMPS is active. This main controller also includes a secondary feed- back input that triggers an ultrasonic pulse (DL1 turned on) if the SECFB voltage drops below its threshold volt- age. This refreshes an external charge pump driven by DL1 without overcharging the output voltage. The device includes independent shutdown controls to simplify power-up and power-down sequencing. To prevent current surges at startup, the internal voltage target is slowly ramped up from zero to the final target over a 1ms period. To prevent the output from ringing below ground in shutdown, the internal voltage target is ramped down from its previous value to zero over a 1ms period. Two independent power-good outputs simplify the interface with external controllers. The MAX17020 is a pin-for-pin replacement of the MAX8778. Features Applications + Denotes a lead(Pb)-free/RoHS-compliant package. * EP = Exposed pad. PART TEMP RANGE PIN-PACKAGE MAX17020ETJ+ -40°C to +85°C 32 TQFN Dual Quick-PWM Internal 100mA 5V or Adjustable Linear Regulator Independent LDO Bypass Input Internal Boost Diodes Secondary Feedback Input Maintains Charge Pump 3.3V 5mA RTC Power (Always On) OUT1: 5V or 1.5V Fixed or 0.7V Adjustable Feedback OUT2: 3.3V or 1.05V Fixed or Dynamic Adjustable Dynamic 0V to 2V REFIN2 Input on Second SMPS 2V ±1% 50µA Reference 6V to 24V Input Range (28V max) Ultrasonic Mode Independent SMPS and LDO Enable Controls Independent SMPS Power-Good Outputs Minimal Component Count Notebook Computers Main System Supply (5V and 3.3V Supplies) I/O System Supply (1.5V and 1.05V Supplies) Graphic Cards DDR1, DDR2, DDR3 Power Supplies Game Consoles Low-Power I/O and Chipset Supplies Two-to-Four Li+ Cell Battery-Powered Devices PDAs and Mobile Communicators Telecommunication MAX17020 THIN QFN (T3255-4) 5mm x 5mm TOP VIEW A "+" SIGN FIRST-PIN INDICATOR DENOTES A LEAD-FREE PACKAGE. 29 30 28 27 12 11 13 14 12 PGOOD2 45 6 7 23 24 22 20 19 18 SKIP OUT2 ON1 PGOOD1 ILIM1 FB1 3 21 31 10 ILIM2 OUT1 32 9 REFIN2 + BYP ON2 26 15 DH1 DH2 25 16 LX1 8 17 LX2 Pin Configuration Quick-PWM is a trademark of Maxim Integrated Products, Inc. EVALUATION KIT AVAILABLE |
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