Product category: Power Supply ICs and Controllers
News Release from: Maxim Integrated Products | Subject: MAX8804Y and MAX8804Z
Edited by the Electronicstalk Editorial Team on 10 July 2007
Small claims for dual-source charger
chips
Tiny charger ICs are ideal for use in cellphones, smartphones and other handheld devices in which safety, charging speed and size are of significant concern.
Available now from Maxim Integrated Products, the MAX8804Y and MAX8804Z are billed as the industry's smallest fully integrated dual-input stand-alone USB/AC-adapter chargers for single-cell lithium-ion (Li+) batteries Capable of shutting off an input voltage higher than 7.5V (typical), as well as withstanding a 30V DC or 16V USB input, the MAX8804Y and MAX8804Z protect against loosely regulated power sources
This article was originally published on Electronicstalk on 27 Aug 2002 at 8.00am (UK)
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Requiring only 6mm2 of board space, these chargers also integrate proprietary thermal-regulation and constant-current, constant-voltage (CCCV) circuitry to eliminate overheating during fast charging and simplify hardware design.
The robustness and integration of these tiny chargers make them ideal for use in cellphones, smartphones and other handheld devices in which safety, charging speed and size are of significant concern.
Achieving the performance of two Li+ battery chargers in a tiny, 2 x 3mm footprint, the MAX8804Y and MAX8804Z feature intelligent USB/DC-input circuitry that automatically selects between either a USB or AC-adapter input source.
Additionally, each charger integrates: two high-voltage, low-on-resistance charging FETs; a reverse-current-blocking diode; a current-sensing resistor; and input overvoltage-protection circuitry.
To further ensure superior performance, they feature a flexible single-wire interface that enables programming of the charge-current level, they deliver up to 700mA of fast-charging current, and they offer a low 2uA battery-leakage current when no input current is attached.
The high integration of the MAX8804Y/MAX8804Z significantly simplifies solution implementation, while saving both space and cost.
The main difference between these devices is that they use different charging sequences: before initiating fast charging, the MAX8804Z utilises a prequalification charging stage to bring the battery voltage to 2.5V, whereas the MAX8804Y starts fast-charging without a precharging stage.
The MAX8804Y and MAX8804Z are available in a tiny, thermally enhanced, 8-pin TDFN package that is fully specified over the extended temperature range (-40 to +85C).
Prices start at US $1.40 (2500-up, FOB USA).
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