Product category: Power Supply ICs and Controllers
News Release from: Maxim Integrated Products | Subject: MAX8677A
Edited by the Electronicstalk Editorial Team on 27 February 2007
Charger chip is smart for dual-source
designs
The MAX8677A is a dual-input USB/AC-adapter linear charger with Smart Power Selector for portable devices powered by rechargeable single-cell Li-ion batteries.
New from Maxim Integrated Products, the MAX8677A is a dual-input USB/AC-adapter linear charger with Smart Power Selector for portable devices powered by rechargeable single-cell Li-ion batteries This charger integrates all of the power switches required for charging and switching the load between the battery and external power, thus eliminating the need for external MOSFETs
This article was originally published on Electronicstalk on 27 Aug 2002 at 8.00am (UK)
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MAX8677A is ideal for portable applications, such as smartphones, PDAs, portable media players, GPS navigation devices, digital still cameras and digital video cameras.
The MAX8677A can operate either from separate inputs for USB and AC-adapter power or from a single input that accepts both.
When external power is connected, the Smart Power Selector allows the system to operate with no battery or a deeply discharged battery.
It automatically switches the system load from the battery and makes the best use of limited USB or adapter power while charging the battery from input power not used by the system.
All necessary current-sense circuitry is included on-chip with the integrated power switches.
The DC input's current limit is adjustable up to 2A, and both DC and USB inputs support 100mA, 500mA and USB-suspend modes.
Charge current is adjustable up to 1.5A to support a wide range of battery capacities.
Other MAX8677A features include thermal regulation, overvoltage protection, charge status and fault outputs, power-OK monitors, a battery thermistor monitor, and a charge timer.
The MAX8677A is available in a space-saving, thermally enhanced, 4 x 4mm, 24-pin TQFN package that is specified for the extended temperature range (-40 to +85C).
Prices start at US $1.95 (1000-up, FOB USA).
An evaluation kit is available to speed designs.
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