MAX1870A
Step-Up/Step-Down Li+ Battery Charger
Step-Up/Step-Down Multichemistry Battery Charger Charges with Battery Voltages Above and Below the Adapter Voltage
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Key Features
Applications/Uses
| Charging VIN (V) (max) | 28 |
| Max. ICHG (A) | 4 |
| Cell Chemistry | Li-Ion Li-Polymer NiCd NiMH |
| # NiMH/ NiCd Cells | 6 9 10 |
| # Lithium Ion Cells | 2 3 4 |
| Protected VIN (V) (max) | 28 |
| Charger (V) | 0 to 17.6 |
| Oper. Temp. (°C) | -40 to +85 |
| Package/Pins | TQFN/32 |
| Budgetary Price (See Notes) | 7.61 |
Simplified Block Diagram
Technical Docs
| Data Sheet | Step-Up/Step-Down Li+ Battery Charger | Sep 01, 2015 |
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 .
Sampling:
Selecting the Sample button above will redirect to the third-party ADI Sample Site. The part selected will carry over to your cart on this site once logged in. Please create a new account there if you have never used the site before. Contact [email protected] with any questions regarding this Sample Site.
Parameters
| Charging VIN (V) (max) | 28 |
| Max. ICHG (A) | 4 |
| Cell Chemistry | Li-Ion Li-Polymer NiCd NiMH |
| # NiMH/ NiCd Cells | 6 9 10 |
| # Lithium Ion Cells | 2 3 4 |
| Protected VIN (V) (max) | 28 |
| Charger (V) | 0 to 17.6 |
| Oper. Temp. (°C) | -40 to +85 |
| Package/Pins | TQFN/32 |
| Budgetary Price (See Notes) | 7.61 |
Key Features
- Highly Flexible Input Voltage Range Works with Affordable AC Adapters
- Step-Up/Step-Down Control Scheme
- Input Voltage from 8V to 28V
- Analog Output Indicates Adapter Current
- Accurately Charge Li+ or NiCd/NiMH Batteries
- Battery Voltage from 0 to 17.6V
- ±0.5% Charge-Voltage Accuracy
- ±9% Charge-Current Accuracy
- ±8% Input Current-Limit Accuracy
- Tune Design to Increase Safety and Efficiency
- Programmable Maximum Battery Charge Current
- Analog Inputs Control Charge Current, Charge Voltage, and Input Current Limit
- 32-Pin Thin QFN (5mm x 5mm) Package Saves Space While Supporting Step-Up and Step-Down Operation
Applications/Uses
- Handheld Terminals
- Notebook and Subnotebook Computers
Description
The MAX1870A accurately charges two to four lithiumion (Li+) series cells at greater than 4A. A programmable input current limit is included, which avoids overloading the AC adapter when supplying the load and the battery charger simultaneously. This reduces the maximum adapter current, which reduces cost. The MAX1870A provides analog outputs to monitor the current drawn from the AC adapter and charge current. A digital output indicates the presence of an AC adapter. When the adapter is removed, the MAX1870A consumes less than 1µA from the battery.
The MAX1870A is available in a 32-pin thin QFN (5mm x 5mm) package and is specified over the -40°C to +85°C extended temperature range. The MAX1870A evaluation kit (MAX1870AEVKIT) is available to help reduce design time.
Technical Docs
| Data Sheet | Step-Up/Step-Down Li+ Battery Charger | Sep 01, 2015 |
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 .
Sampling:
Selecting the Sample button above will redirect to the third-party ADI Sample Site. The part selected will carry over to your cart on this site once logged in. Please create a new account there if you have never used the site before. Contact [email protected] with any questions regarding this Sample Site.
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