MAX863
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
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Overview
Features and Benefits
- 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
Product Details
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
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Product Lifecycle
Production
At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.
Documentation & Resources
Design Resources
ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal.
PCN-PDN Information
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Buy Now Pricing
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List Pricing
(*)The 1Ku list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Analog Devices, Inc. authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.
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