The battery charger chip is the core component of the lithium battery management system, which can be divided into linear charging chips and switch type charging chips according to the topology structure; According to battery configuration, it can be divided into single cell, double cell, and multi cell schemes. The mainstream models and their technical characteristics are classified into four categories:
1、 Single lithium battery charging chip
Suitable for small devices such as mobile phones and Bluetooth earphones, with a linear architecture as the main approach:
1. QF4075 (SOT235)
Specially designed for lithium iron phosphate (LiFePO ₄), with a charging voltage of 3.6V, supporting 800mA current, and terminating charging through C/10 current.
Integrated thermal regulation function, 55 μ A standby current, suitable for USB power supply scenarios.
2. TP4054/AP5055 (SOT235)
Universal single cell lithium battery solution (4.2V), supports 800mA charging, with an accuracy of ± 1%.
No need for external MOSFETs and diodes, standby current as low as 25 μ A, widely used in Bluetooth devices.
3. CSM4056 (ESOP8)
1A high current output, supports 0V battery activation, integrated three-stage charging (trickle/constant current/constant voltage).
Equipped with temperature protection and IEC62368 certification, suitable for fast charging scenarios.
4. LY4059 (SOP8/SOT25)
2A ultra-high linear current, input withstand voltage of 6V, supporting ± 0.7% voltage accuracy, surge current suppression enhances safety.
2、 Dual cell lithium battery charging chip
For medium power devices such as tablets and portable speakers, it is required to support 8.4V high voltage:
1. ZCC6982 (QFN/ESSOP10)
Synchronous boost architecture, 2A charging current, adjustable charging voltage (8.4V-8.8V), efficiency up to 96%.
Support NTC temperature monitoring, integrated short circuit protection and automatic recharging.
2. SC7084 (SOP8)
Wide input voltage range (4.8-20V), 1.5A output, accuracy ± 0.5%, built-in MOSFET simplifies design.
3、 Switch type charging management chip
Suitable for high current fast charging scenarios, using Buck/Boost topology:
1. SC89601D (QFN 4x424)
3A synchronous voltage reduction solution, supporting 3.9-13.5V input, integrated dynamic path management (NVDC).
Through I ² C programming parameters, including JEITA temperature control protocol, suitable for mobile phones and tablets.
2. Freescale MC3467x series (UDFN)
High customization solution (such as MC34673 supporting 1.2A), input voltage withstand 28V, accuracy ± 0.4%.
Programmable parameters include current, timeout threshold, etc., which comply with the standards of car adapters.
4、 Comparison of Technical Parameters
The following table summarizes the key model characteristics:
|Model | Input Voltage (V) | Charging Current | Topology | Packaging | Typical Applications|
|QF4075 | 5 (USB) | 800mA | Linear | SOT235 | Bluetooth device |
|CSM4056 | 4.5-6.5 | 1A | Linear | ESOP8 | Fast Charging Accessories |
|ZCC6982 | 3.0-6.5 | 2A | Synchronous Boost | QFN/ESSOP10 | Mobile Power Bank |
|SC89601D | 3.9-13.5 | 3A | Buck voltage reduction | QFN 4x424 | Tablet computer |
|MC34673 | 6-28 | 1.2A | Adjustable switch | UDFN | Industrial equipment |
5、 Technological development trends
1. High precision voltage control
MC34674 has a voltage accuracy of ± 0.2%, while CSM4056 achieves ± 1%, extending battery life.
2. High current fast charging
The switch chip SC89601D supports 3A and the linear scheme LY4059 reaches 2A, meeting the fast charging requirements.
3. High integration and intelligence
Built in MOSFET, path management (such as SC89601D), and I ² C interface programming to reduce peripheral components.
4. Wide input voltage range
Industrial grade solutions such as MC34673 support 28V input, eliminating the need for overvoltage protection circuits.
6、 Selection suggestions
Portable devices: Linear chips (QF4075/TP4054) are preferred, with low cost and small packaging.
Fast charging requirements: Choose switch architecture (SC89601D) or high current linear core (LY4059).
Dual cell battery: requires synchronous boost scheme such as ZCC6982, balancing efficiency and voltage accuracy.
High reliability scenario: Freescale programmable series is suitable for complex working conditions.
The above models cover multiple scenarios such as consumer electronics, industrial, and automotive needs. Technological iteration focuses on improving efficiency, accuracy, and integration, and when selecting, it is necessary to balance power consumption, packaging, and functional scalability.