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Small (4mm x 4mm) Package 4.25V to 12V Input Range (MAX1926) Overvoltage Lockout at 6.1V (MAX1925) ±0.75% Battery Regulation Voltage Set Charge Current with One Resistor Automatic Input Power Sense LED (or Logic-Out) Charge Status and Fault Indicator Programmable Safety Timer Autorestart at Cell = 4V Thermistor Monitor Input
MAX1926
Switch-Mode 1-Cell Li+ Chargers
Smallest, Simplest Switch-Mode Li+ Charger in 4mm x 4mm QFN Package
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Key Features
Applications/Uses
Parametric specs for Battery Chargers
| Package/Pins | TQFN/12 |
| Budgetary Price (See Notes) | 1.8 |
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Parameters
Parametric specs for Battery Chargers
| Package/Pins | TQFN/12 |
| Budgetary Price (See Notes) | 1.8 |
Key Features
Applications/Uses
- Cradle Chargers
- Digital Still Cameras
- PDAs
- Self-Charging Battery Packs
Description
The MAX1925/MAX1926 single-cell lithium-ion (Li+) switch-mode battery chargers use an external PMOS pass element step-down configuration. Charge current is programmable, and an external capacitor sets the maximum charge time.
Additional features include automatic input power detection (active-low ACON output), 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 4.25V 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 2V and 3V. Full charge current is then applied above 3V. A active-low CHG output drives an LED to indicate charging (LED on) and fault conditions (LED blinking).
The MAX1925/MAX1926 are available in a 12-pin 4mm x 4mm thin QFN package and are specified over the extended temperature range (-40°C to +85°C). An evaluation kit is available to speed design.
Additional features include automatic input power detection (active-low ACON output), 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 4.25V 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 2V and 3V. Full charge current is then applied above 3V. A active-low CHG output drives an LED to indicate charging (LED on) and fault conditions (LED blinking).
The MAX1925/MAX1926 are available in a 12-pin 4mm x 4mm thin QFN package and are specified over the extended temperature range (-40°C to +85°C). An evaluation kit is available to speed design.
Technical Docs
Support & Training
Search our knowledge base for answers to your technical questions.
Filtered SearchOur dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal .
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