Top

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

Product Details

Key Features

Parametric specs for Step-Up Switching Regulators
VIN (V) (min) 1.5
VIN (V) (max) 11
VOUT1 (V) (min) 1.25
VOUT1 (V) (max) 100
IOUT1 (A) (max) 2
Switch Type External
Output Adjust. Method Resistor
Power Good Signal Yes
IQ (mA) (typ) 0.05
Shutdown Mode Supply Current (µA) (typ) 1
# DC-DC Outputs 2
Package/Pins QSOP/16
Budgetary
Price (See Notes)
3.71

Simplified Block Diagram

Technical Docs

Support & Training

Search our knowledge base for answers to your technical questions.

Filtered Search

Our dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal .

Sampling:
Selecting the Sample button above will redirect to the third-party ADI Sample Site. The part selected will carry over to your cart on this site once logged in. Please create a new account there if you have never used the site before. Contact SampleSupport@analog.com with any questions regarding this Sample Site.

Parameters

Parametric specs for Step-Up Switching Regulators
VIN (V) (min) 1.5
VIN (V) (max) 11
VOUT1 (V) (min) 1.25
VOUT1 (V) (max) 100
IOUT1 (A) (max) 2
Switch Type External
Output Adjust. Method Resistor
Power Good Signal Yes
IQ (mA) (typ) 0.05
Shutdown Mode Supply Current (µA) (typ) 1
# DC-DC Outputs 2
Package/Pins QSOP/16
Budgetary
Price (See Notes)
3.71

Key Features

  • 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

Applications/Uses

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

Description

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.

Simplified Block Diagram

MAX863: Typical Operating Circuit MAX863: Typical Operating Circuit Zoom icon

Technical Docs

Support & Training

Search our knowledge base for answers to your technical questions.

Filtered Search

Our dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal .

Sampling:
Selecting the Sample button above will redirect to the third-party ADI Sample Site. The part selected will carry over to your cart on this site once logged in. Please create a new account there if you have never used the site before. Contact SampleSupport@analog.com with any questions regarding this Sample Site.