MAX745
Switch-Mode Lithium-Ion Battery-Charger
±0.75% Precision Li+ Charger Delivers 4A Without Heating
MyMaxim SubscriptionsProduct Details
Key Features
Applications/Uses
| Charging VIN (V) (max) | 24 |
| Max. ICHG (A) | 4 |
| Cell Chemistry | Li-Ion Li-Polymer |
| # Lithium Ion Cells | 1 2 3 4 |
| Protected VIN (V) (max) | 24 |
| Charger (V) | 18 |
| Oper. Temp. (°C) | -40 to +85 |
| Package/Pins | SSOP/20 |
| Budgetary Price (See Notes) | 6.02 |
Simplified Block Diagram
Technical Docs
How to Use the MAX745 as a Maximum Power Point Tracker Solar Charger
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) | 24 |
| Max. ICHG (A) | 4 |
| Cell Chemistry | Li-Ion Li-Polymer |
| # Lithium Ion Cells | 1 2 3 4 |
| Protected VIN (V) (max) | 24 |
| Charger (V) | 18 |
| Oper. Temp. (°C) | -40 to +85 |
| Package/Pins | SSOP/20 |
| Budgetary Price (See Notes) | 6.02 |
Key Features
- Charges 1 to 4 Li+ Battery Cells
- ±0.75% Voltage-Regulation Accuracy Using 1% Resistors
- Provides up to 4A without Excessive Heating
- 90% Efficient
- Uses Low-Cost Set Resistors and N-Channel Switch
- Up to 24V Input
- Up to 18V Maximum Battery Voltage
- 300kHz Pulse-Width Modulated (PWM) Operation
- Low-Noise, Small Components
- Stand-Alone OperationNo Microcontroller Needed
Applications/Uses
- Cell Phones
- Desktop Cradle Chargers
- Handheld Instruments (PDAs, Palmtops)
- Li+ Battery Packs
- Notebook Computers
Description
The MAX745 regulates the voltage set point and charging current using two loops that work together to transition smoothly between voltage and current regulation. The per-cell battery voltage regulation limit is set between 4V and 4.4V using standard 1% resistors, and then the number of cells is set from 1 to 4 by pin-strapping. Total output voltage error is less than ±0.75%.
For a similar device with an SMBus™ microcontroller interface and the ability to charge NiCd and NiMH cells, refer to the MAX1647 and MAX1648. For a low-cost Li+ charger using a linear-regulator control scheme, refer to the MAX846A.
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 .
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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