MAX17083

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Low-Voltage, Internal Switch, Step-Down Regulator

Saves Price and Board Space—Internal 5A Step-Down Regulator

Data Sheet (Rev. 0) Product Selection Table
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Overview

  • Fixed-Frequency, Current-Mode Controller
  • 2.4V to 5.5V Input Range
  • Internal 5A Step-Down Regulator
  • Internal BST Switch
  • Fault Protection: Undervoltage, Overvoltage, Thermal, Peak Current Limit
  • Enable Input and Power-Good Output
  • Voltage-Controlled Soft-Start
  • High-Impedance Shutdown
  • < 1µA (typ) Shutdown Current

The MAX17083 is a fixed-frequency, current-mode, step-down regulator optimized for low-voltage, low-power applications. This regulator features dual internal n-channel MOSFET power switches for high efficiency and reduced component count. External Schottky diodes are not required. An integrated boost switch eliminates the need for an external boost diode. The internal 25mΩ low-side power MOSFET easily supports continuous load currents up to 5A. The MAX17083 produces an adjustable 0.75V to 2.7V output voltage from the system's 3.3V or 5V input supply.

This step-down regulator uses a peak current-mode control scheme to eliminate the additional external compensation required by voltage-mode architectures, providing an easy-to-implement architecture without sacrificing fast transient response. The MAX17083 provides peak current-limit protection and operates in light-load pulse-skipping mode to maintain high efficiency under light-load conditions.

Independent enable input and open-drain power-good output allow flexible system power sequencing. The voltage soft-start gradually ramps up the output voltage within a predictable time period, effectively limiting the inrush current. The MAX17083 features output undervoltage, output overvoltage, and thermal-fault protection.

The MAX17083 is available in a 24-pin 4mm x 4mm x 0.75mm TQFN package. The exposed backside pad improves thermal characteristics.

Applications

  • Low-Power Architectures
  • Netbook and Nettop PCs
  • Notebook and Subnotebook Computers
  • PDAs and Mobile Communicators
  • Portable Gaming
  • Ultra-Mobile PCs
MAX17083
Low-Voltage, Internal Switch, Step-Down Regulator
MAX17083: Standard Application Circuit
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Documentation

Data Sheet 1

Reliability Data 1

Design Note 1

Technical Articles 3

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Evaluation Kits

MAX17083EVKIT

Evaluation Kit for the MAX17083

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Features and Benefits

  • 2.4V to 5.5V Input Range
  • Configured for 1.1V Output Voltage
  • Adjustable Output-Voltage Range (0.75V to 2.7V)
  • 5A Output Current
  • 90% Efficiency (VIN = 3.3V, VOUT = 1.1V at 2A)
  • 1MHz Switching Frequency
  • Pin-Selectable Four-Level Switching Frequency (500kHz, 750kHz, 1MHz, and 1.5MHz)
  • Enable Input
  • Power-Good Output Indicator (POK)
  • Low-Profile Surface-Mount Components
  • Lead(Pb)-Free and RoHS Compliant
  • Fully Assembled and Tested

Product Details

The MAX17083 evaluation kit (EV kit) is a fully assembled and tested PCB that demonstrates the typical 5A application circuit of the MAX17083. The MAX17083 is a DC-DC converter that steps down the system's 3.3V or 5V input supply for low-voltage, low-power applications.

The MAX17083 EV kit provides a 1.1V output voltage from a 2.4V to 5.5V input range. It delivers up to 5A output current while achieving greater than 90% efficiency. Programmed through jumper JU4, the EV kit operates at 1MHz switching frequency and has superior line- and load-transient response. The EV kit also allows the evaluation of other adjustable output voltages from 0.75V to 2.7V, by varying the SET pin and changing resistors R3 and R4.

Applications

  • Low-Power Architectures
  • Netbook and Nettop PCs
  • Notebook and Subnotebook Computers
  • PDAs and Mobile Communicators
  • Portable Gaming
  • Ultra-Mobile PCs
MAX17083EVKIT
Evaluation Kit for the MAX17083

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