MAX8649

1.8A Step-Down Regulator with Remote Sense in 2mm x 2mm WLP

Ideal for High Performance Applications Processors with Better than 2% Voltage Accuracy Over Line, Load, and Temperature

Data Sheet (Rev. 4)
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Overview

  • 1.8A Guaranteed Output Current
  • I²C Programmable VOUT (750mV to 1.38V in 10mV steps)
  • Operates from 2.5V to 5.5V Input Supply
  • On-Chip FET and Synchronous Rectifier
  • Fixed 3.25MHz PWM Switching Frequency
  • Synchronizes to 13MHz, 19.2MHz, or 26MHz System Clock when Available
  • Small 1.0µH Inductor
  • Initial Accuracy 0.5% at 1.25V Output
  • 2% Output Accuracy Over Load, Line, and Temperature
  • Power-Save Mode Increases Light Load Efficiency
  • Overvoltage and Overcurrent Protection
  • Thermal Shutdown Protection
  • 400kHz I²C Interface
  • < 1µA Shutdown Current
  • 16-Bump, 2.2mm x 2.2mm WLP Package

The MAX8649 high-efficiency DC-to-DC step-down switching regulator delivers up to 1.8A of output current. The device operates from a 2.5V to 5.5V input voltage range, making it future proof for next-generation battery technologies. The output voltage is I²C programmable from 0.75V to 1.38V. Remote sense ensures precise DC regulation at the load. Total output error is less than 2% over load, line, and temperature.

The MAX8649 operates at a 3.25MHz fixed frequency. The high operating frequency minimizes the size of external components. The MAX8649 provides several features to minimize EMI of the DC-DC step-down converter. The switching frequency of the converter can be synchronized to the master clock of the application. When synchronizing to an external clock, the MAX8649 measures the frequency of the external clock to ensure that the clock is stable before changing the switching frequency to the external clock frequency.

An on-board DAC allows adjustment of the output voltage in 10mV steps. The output voltage can be programmed directly through the I²C interface, or by preloading a set of on-board registers and using the two VID logic signals to select the appropriate register. Other features include internal soft-start control circuitry to reduce inrush current, output overvoltage, overcurrent, and overtemperature protection.

Applications

  • Cell Phones and Smartphones
  • PDAs and MP3 Players
MAX8649
1.8A Step-Down Regulator with Remote Sense in 2mm x 2mm WLP
MAX8649: Typical Operating Circuit
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Documentation

Data Sheet 1

Technical Articles 2

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Software Resources

Device Drivers 1

Hardware Ecosystem

Parts Product Life Cycle Description
Switching Regulators & Controllers 2
MAX8952
PRODUCTION 2.5A Step-Down Regulator with Remote Sense in 2mm x 2mm WLP
MAX8973A
LAST TIME BUY 9A, Three-Phase Step-Down Switching Regulator
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Evaluation Kits

MAX8649EVKIT

Evaluation Kit for the MAX8649

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Features and Benefits

  • 1.8A Guaranteed Output Current
  • I²C-Programmable VOUT (750mV to 1.38V in 10mV Steps)
  • Operates from 2.5V to 5.5V Input Supply
  • On-Chip FET and Synchronous Rectifier
  • Fixed 3.25MHz PWM Switching Frequency
  • Synchronizes to 13MHz, 19.2MHz, or 26MHz System Clock When Available
  • Small 1µH Inductor
  • Initial Accuracy 0.5% at 1.25V Output
  • 2.0% Output Accuracy Over Load, Line, and Temperature
  • Power-Save Mode Increases Light Load Efficiency
  • Overvoltage and Overcurrent Protection
  • Thermal-Shutdown Protection
  • On-Board USB-to-I²C Interface

Product Details

The MAX8649 evaluation kit (EV kit) is a fully assembled and tested circuit for evaluating the MAX8649 1.8A step-down regulator. The EV kit operates from a 2.5V to 5.5V supply voltage and outputs a voltage programmable from 0.75V to 1.38V at up to 1.8A. An on-board USB-to-I²C interface and EV kit software control the output voltage, operating modes, and other features of the IC.

Applications

  • Cell Phones and Smartphones
  • PDAs and MP3 Players
MAX8649EVKIT
Evaluation Kit for the MAX8649

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