High-Efficiency, 8A, Current-Mode Synchronous Step-Down Switching Regulator with VID Control

Smallest (2mm x 2.5mm), 8A, DC-DC Solution with Integrated MOSFETs in the Market
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Part Number Status
MAX15109 Active: In Production. See Ordering Information for details.


The MAX15109 high-efficiency, current-mode, synchronous step-down switching regulator with integrated power switches deliver up to 8A of output current. This regulator operates from 2.7V to 5.5V and provides four output voltages using two VID control inputs.

This IC utilizes a current-mode control architecture with a high gain transconductance error amplifier. The current-mode control architecture facilitates easy compensation design and ensures cycle-by-cycle current limit with fast response to line and load transients.

This regulator offers skip-mode functionality to reduce current consumption and achieve a higher efficiency at light loads. The low RDS(ON) integrated switches ensure high efficiency at heavy loads while minimizing critical inductance, making the layout design a much simpler task with respect to discrete solutions. The high switching frequency (1MHz), along with the PWM current-mode architecture allows for a compact, all ceramic capacitor design.

The IC features a capacitor-programmable slew-rate control to reduce input current at the startup and when the output changes state under VID control. Internal control circuitry ensures safe-startup into a prebiased output. Power sequencing is controlled with the enable input and power-good output.

The IC is available in a 20-bump (4 x 5 array), 2.5mm x 2mm, WLP package and is fully specified over the -40°C to +85°C temperature range.

Data Sheet

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Key Features

  • Continuous 8A Output Current Over Temperature
  • Efficiency Over 90%
  • ±1% Accuracy Over Load, Line, and Temperature
  • Operate from a 2.7V to 5.5V Supply
  • VID Control Inputs for Selecting Output Voltage
  • Programmable Slew-Rate Control
  • Safe Startup into Prebiased Output
  • 1MHz Switching Frequency
  • Stable with Low-ESR Ceramic Output Capacitors
  • Enable Input and Power-Good Output for Power-Supply Sequencing
  • Cycle-by-Cycle Overcurrent Protection Faults
  • Fully Protected Against Overcurrent and Overtemperature
  • Input Undervoltage Lockout
  • 20-Bump (4 x 5 Array), 2.5mm x 2mm, WLP Package


  • DDR Memory
  • Distributed Power Systems
  • Notebook Power

Key Specifications:

Step-Down Switching Regulators
Part Number VIN
Preset VOUT
Output Adjust. Method IOUT1 (max)
Switch Type Synchronous Switching Power Good Signal DC-DC Outputs Oper. Freq.
min max min max See Notes
MAX15109  2.7 5.5 0.675 0.9
8 Internal Yes Yes 1 1000 $4.30 @1k
See All Step-Down Switching Regulators (310)

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.


MAX15109: Typical Operating Circuit
Typical Operating Circuit

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Document Ref.: 19-5918 Rev 1; 2011-10-20
This page last modified: 2012-01-03