MAX1873
Simple Current-Limited Switch-Mode Li+ Charger Controller
Lowest Cost Switch-Mode Li+ Charger includes Input-Current Limiting Loop
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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 | 5 6 7 8 9 10 |
| # Lithium Ion Cells | 2 3 4 |
| Protected VIN (V) (max) | 28 |
| Charger (V) | 8 to 17.6 |
| Oper. Temp. (°C) | -40 to +85 |
| Package/Pins | QSOP/16 |
| Budgetary Price (See Notes) | 2.36 |
Simplified Block Diagram
Technical Docs
| Data Sheet | Simple Current-Limited Switch-Mode Li+ Charger Controller | Jul 01, 2001 | |
| App Note | Understanding Li+ Battery Operation Lessens Charging Safety Concerns |
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 | 5 6 7 8 9 10 |
| # Lithium Ion Cells | 2 3 4 |
| Protected VIN (V) (max) | 28 |
| Charger (V) | 8 to 17.6 |
| Oper. Temp. (°C) | -40 to +85 |
| Package/Pins | QSOP/16 |
| Budgetary Price (See Notes) | 2.36 |
Key Features
- Low-Cost and Simple Circuit
- Charges 2-, 3-, or 4-Series Lithium-Ion Cells
- AC Adapter Input-Current-Limit Loop
- Also Charges Ni-Based Batteries
- Analog Output Monitors Charge Current
- ±0.75% Battery-Regulation Voltage
- 5µA Shutdown Battery Current
- Input Voltage Up to 28V
- 200mV Dropout Voltage/100% Duty Cycle
- Adjustable Charging Current
- 300kHz PWM Oscillator Reduces Noise
- Space-Saving 16-Pin QSOP
- MAX1873 Evaluation Kit Available to Speed Designs
Applications/Uses
- 2-, 3-, or 4-Cell Li+ Battery Pack Chargers
- 6-, 9-, or 10-Cell Li+ Battery Pack Chargers
- Desktop Cradle Chargers
- Handheld Instruments (PDAs, Palmtops)
- Notebook Computers
- Portable Desktop Assistants (PDAs)
- Portable Internet Tablets
Description
The MAX1873R/S/T regulates the battery voltage and charging current using two control loops that work together to transition smoothly between voltage and current regulation. An additional control loop limits current drawn from the input source so that AC adapter size and cost can be minimized. An analog voltage output proportional to charging current is also supplied so that an ADC or microcontroller can monitor charging current.
The MAX1873 may also be used as an efficient current-limited source to charge NiCd or NiMH batteries in multichemistry charger designs. The MAX1873R/S/T is available in a space-saving 16-pin QSOP package. Use the evaluation kit (MAX1873EVKIT) to help reduce design time.
Technical Docs
| Data Sheet | Simple Current-Limited Switch-Mode Li+ Charger Controller | Jul 01, 2001 | |
| App Note | Understanding Li+ Battery Operation Lessens Charging Safety Concerns |
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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