Product category: Power Supply ICs and Controllers
News Release from: Maxim Integrated Products | Subject: MAX1874
Edited by the Electronicstalk Editorial Team on 06 August 2003
Charger chip cuts out the cube
The MAX1874 is a dual-input, linear, single-cell lithium-ion battery charger for charging from both USB and AC-adapter sources, enabling portable users to forego carrying a wall cube.
The MAX1874 is a dual-input, linear, single-cell lithium-ion (Li+) battery charger for charging from both USB and AC-adapter sources, enabling portable users to forego carrying a wall cube USB charging is particularly attractive for PDAs, cellphones, digital still cameras, MP3 players and other handheld products
This article was originally published on Electronicstalk on 27 Aug 2002 at 8.00am (UK)
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The MAX1874 accepts input voltages up to 6.5V and does not require diodes or an external mosfet.
DC-input overvoltage protection up to 18V can be added with a single SOT PFET.
The device also features battery-to-DC power switchover to drive the system directly from the power source instead of the battery.
Thermal regulation of the charger temperature simplifies PC-board layout, minimises component size guard bands, and maximises the charging rate under all battery and input voltage conditions.
Instead of shutting down when the thermal limit is reached, the MAX1874 simply reduces the charging current.
In addition, ambient or battery temperature can be monitored with an external thermistor as a separate safety feature.
The MAX1874 is available in a 5 x 5mm, 16-pin TQFN package and is specified for the extended-industrial temperature range (-40 to +85C).
Prices start at $1.75 (1000-up, FOB USA).
An evaluation kit is available to speed designs.
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