Overview
The MAX745EAP+ is a switch-mode lithium-ion battery charger produced by Analog Devices Inc./Maxim Integrated. This integrated circuit provides all the necessary functions for charging lithium-ion battery packs, making it a comprehensive solution for various battery-powered devices. It is designed to offer high efficiency and precision in charging, with features such as regulated charging current and voltage, and the ability to charge 1 to 4 lithium-ion battery cells.
Key Specifications
| Parameter | Conditions | Min | Typ | Max | Units |
|---|---|---|---|---|---|
| Input Voltage Range | 6.0V to 24V | - | - | - | V |
| Output Voltage Accuracy | - | -1.0% | - | 1.0% | % |
| Charging Current | - | - | - | 4A | A |
| Oscillator Frequency | - | 260kHz | 340kHz | - | kHz |
| Maximum Battery Voltage | - | - | - | 18V | V |
| Operating Temperature Range | - | -40°C | - | 85°C | °C |
| Package Type | - | - | - | 20 SSOP | - |
Key Features
- Charges 1 to 4 lithium-ion battery cells with ±0.75% voltage-regulation accuracy using 1% resistors.
- Provides up to 4A charging current without excessive heating.
- 90% efficient switch-mode operation.
- Uses low-cost set resistors and N-channel MOSFETs.
- Up to 24V input and up to 18V maximum battery voltage.
- 300kHz pulse-width modulated (PWM) operation for low noise and small component size.
- Stand-alone operation—no microcontroller needed.
Applications
- Lithium-ion battery packs.
- Desktop cradle chargers.
- Cellular phones.
- Notebook computers.
- Hand-held instruments.
Q & A
- What is the MAX745EAP+ used for?
The MAX745EAP+ is used for charging lithium-ion battery packs.
- How many lithium-ion battery cells can the MAX745EAP+ charge?
The MAX745EAP+ can charge 1 to 4 lithium-ion battery cells.
- What is the maximum charging current provided by the MAX745EAP+?
The MAX745EAP+ provides up to 4A charging current.
- What is the input voltage range for the MAX745EAP+?
The input voltage range is 6.0V to 24V.
- What is the operating temperature range of the MAX745EAP+?
The operating temperature range is -40°C to 85°C.
- Does the MAX745EAP+ require a microcontroller for operation?
No, the MAX745EAP+ operates stand-alone without the need for a microcontroller.
- What is the efficiency of the MAX745EAP+?
The MAX745EAP+ achieves 90% efficiency in switch-mode operation.
- What type of MOSFET does the MAX745EAP+ use?
The MAX745EAP+ uses an N-channel MOSFET as the power switch.
- What is the oscillator frequency of the MAX745EAP+?
The oscillator frequency is approximately 300kHz.
- What package type is the MAX745EAP+ available in?
The MAX745EAP+ is available in a 20-pin SSOP package.
