MAX17020

Dual Quick-PWM Step-Down Controller with Low-Power LDO, RTC Regulator

Multipurpose Controller Configurable for System Power, Graphics, and Memory Applications in Notebooks


Please check latest availability status for a specific part variant.

Description

The MAX17020 is a dual Quick-PWM™ step-down power-supply (SMPS) controller with synchronous rectification, intended for main 5V/3.3V or I/O 1.5V/1.05V power generation in battery-powered systems. Lowside 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 ultrasonic 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 feedback input that triggers an ultrasonic pulse (DL1 turned on) if the SECFB voltage drops below its threshold voltage. 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.
MAX17020: Functional Diagram MAX17020: Functional Diagram Enlarge+

Key Features

  • 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

Applications/Uses

  • DDR1, DDR2, DDR3 Power Supplies
  • Game Consoles
  • Graphic Cards
  • I/O System Supply (1.5V and 1.05V Supplies)
  • Low-Power I/O and Chipset Supplies
  • Main System Supply (5V and 3.3V Supplies)
  • Notebook Computers
  • PDAs and Mobile Communicators
  • Telecommunication
  • Two to Four Li+ Cells Battery-Powered Devices
Part NumberVIN
(V)
VIN
(V)
VOUT1
(V)
VOUT1
(V)
Preset VOUT
(V)
Output Adjust. MethodIOUT1
(A)
Switch TypeSynchronous SwitchingPower Good SignalDC-DC OutputsOper. Freq.
(kHz)
Package/PinsBudgetary
Price
minmaxminmaxSee Notes
MAX17020 62405.53.3Preset10ExternalYesYes2500
TQFN/32
$2.32 @1k
See All Step-Down Switching Regulators (365)
Pricing Notes:
This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific and version-specific prices and delivery, please see the price and availability page or contact an authorized distributor.


MAX17020EVKIT: Evaluation Kit for the MAX17020

Quality and Environmental Data

Product Reliability Reports: MAX17020.pdf 
Lead-Free Package Tin (Sn) Whisker Reports

CAD Symbols and Footprints

  • MAX17020ETJ+
  • MAX17020ETJ+CCM
  • MAX17020ETJ+T
  • MAX17020ETJ+TCCM
  • Device   Fab Process   Technology   Sample size   Rejects   FIT at 25°C   FIT at 55°C  

    Note : The failure rates are summarized by technology and mapped to the associated material part numbers. The failure rates are highly dependent on the number of units tested.

    Quality Management System >
    Environmental Management System >

     
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