MAX863

PRODUCTION

Dual, High-Efficiency, PFM, Step-Up DC-DC Controller

Smallest Dual-Output Step-Up Converter Powers Logic and LCD or Flash from 1.5V Input

Data Sheet (Rev. 2) Product Selection Table
Viewing:

Overview

  • Smallest Dual Step-Up Converter: 16-Pin QSOP
  • 90% Efficiency
  • 1.5V Start-Up Voltage
  • 85µA Max Total Quiescent Supply Current
  • 1µA Shutdown Mode
  • Independent Shutdown Inputs
  • Drives Surface-Mount, Dual N-Channel MOSFETs
  • Low-Battery Input/Output Comparator
  • Step-Up/Down Configurable

The MAX863 dual-output DC-DC converter contains two independent step-up controllers in a single compact package. This monolithic Bi-CMOS design draws only 85µA when both controllers are on. The input range extends down to 1.5V, permitting use in organizers, translators, and other low-power hand-held products. The MAX863 provides 90% efficiency at output loads from 20mA to over 1A. This space-saving device is supplied in a 16-pin QSOP package that fits in the same area as an 8-pin SOIC.

The device uses a current-limited, pulse-frequency-modulated (PFM) control architecture that reduces start-up surge currents and maintains low quiescent currents for excellent low-current efficiency. Each controller drives a low-cost, external, N-channel MOSFET switch, whose size can be optimized for any output current or voltage.

In larger systems, two MAX863s can be used to generate 5V, 3.3V, 12V, and 28V from just two or three battery cells. An evaluation kit (MAX863EVKIT) is available to speed designs. For a single-output controller, refer to the MAX608 and MAX1771 data sheets.

Applications

  • 2- and 3-Cell Portable Equipment
  • Dual Supply (Logic and LCD)
  • Handheld Instruments (PDAs, Palmtops)
  • Organizers
  • Palmtop Computers
  • PDAs and Other Handheld Devices
  • Translators
MAX863
Dual, High-Efficiency, PFM, Step-Up DC-DC Controller
MAX863: Typical Operating Circuit
Add to myAnalog

Add product to the Products section of myAnalog (to receive notifications), to an existing project or to a new project.

Create New Project
Ask a Question

Documentation

Data Sheet 1

Reliability Data 1

Design Note 3

Learn More
Add to myAnalog

Add media to the Resources section of myAnalog, to an existing project or to a new project.

Create New Project

Software Resources

Can't find the software or driver you need?

Request a Driver/Software

Evaluation Kits

MAX863EVKIT

Evaluation Kit for the MAX863

Buy Now View Details

Features and Benefits

  • Output Voltages: Preset 5V and 3.3V, or User-Defined
  • Output Currents:
    • 700mA at 5V, 1.1A at 3.3V (VIN = 2.4V)
    • 350mA at 5V, 600mA at 3.3V (VIN = 1.5V)
  • Low-Battery Detector
  • Fully Assembled and Tested
  • Proven PC Board Layout

Product Details

The MAX863 evaluation kit (EV kit) is an assembled and tested PC board that demonstrates the MAX863 dual, step-up DC-DC controller. The EV kit is factory preset to provide 5V and 3.3V outputs at 700mA and 1.1A, respectively (VIN = 2.4V). Both outputs can also be set to other voltages by pin-strapping or with external resistors.

Applications

  • 2- and 3-Cell Portable Equipment
  • Dual Supply (Logic and LCD)
  • Handheld Instruments (PDAs, Palmtops)
  • Organizers
  • Palmtop Computers
  • PDAs and Other Handheld Devices
  • Translators
MAX863EVKIT
Evaluation Kit for the MAX863

Latest Discussions

No discussions on MAX863 yet. Have something to say?

Start a Discussion on EngineerZone®

Recently Viewed