Product category:
Power Supply ICs and Controllers
News Release from: Maxim Integrated Products | Subject: MAX1925/MAX1926
Edited by the Electronicstalk Editorial
Team on 17 September 2002
Compact chip creates simple chargers
The MAX1925 and MAX1926 are low-cost single-cell lithium-ion (Li+) switch-mode battery chargers for use in digital still cameras and PDAs.
The MAX1925 and MAX1926 are low-cost single-cell lithium-ion (Li+) switch-mode battery chargers for use in digital still cameras and PDAs The MAX1925/MAX1926 use an inexpensive external PMOS pass element step-down configuration for applications where low heat dissipation and small size are critical
This article was originally published on Electronicstalk on 27 Aug 2002 at 8.00am (UK)
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Charge current is programmable up to 1A, and an external capacitor sets the maximum charge time.
Additional features include automatic input power detection (AC adapter detection), logic-controlled enable, and temperature monitoring with an external thermistor.
The MAX1925 disables charging for inputs greater than 6.1V, while the MAX1926 charges for inputs between 4.25 and 12V.
The MAX1925/MAX1926 feature two precondition levels to restore near-dead cells.
The devices source 4mA to a cell that is below 2V while sourcing C/10 to a cell between 2 and 3V.
Full charge current is then applied above 3V.
An output drives a LED to indicate charging (LED on) and fault conditions (LED blinking).
The MAX1925/MAX1926 are packaged in a tiny 12-pin 4 x 4mm QFN and are screened for the extended-industrial temperature range (-40 to +85C).
Prices start at $1.70 (1000-up, FOB USA).
An evaluation kit is available to speed design.
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