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Slkor has R&D institutions in Beijing and Suzhou, and its Shenzhen headquarters includes a laboratory and central warehouse. The main products include three major series: diodes and transistors, power devices, and power management chips. New products such as Hall sensors, ADCs, BMS, high-speed optocouplers, and crystal oscillators are gradually being introduced. These products are used in smartphones, laptops, robots, power tools, telematics, 3C digital products, AIoT, and other industries, cooperating with more than 10,000 global partners!

 

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1.1 Name: Slkor DW03 Lithium Battery Protection Application Solution

1.2 Application: Single-cell lithium-ion battery pack; lithium polymer battery pack

 

2. The chip comes in a SOT23-5 package.

 

2.1 Product Features

The DW03 product is a highly integrated solution for protecting single-cell lithium-ion/lithium polymer rechargeable battery packs. The DW03 includes an advanced power MOSFET, high-precision voltage detection circuits, and delay circuits.

 

The DW03 provides all necessary battery protection functions such as overcharge, over-discharge, overcurrent, and short circuit, with very low power consumption during operation. This chip is not only designed for mobile phones but is also suitable for all kinds of information products that require lithium-ion or lithium polymer rechargeable batteries for long-term power supply.

 

2.2

The DW03 monitors battery voltage and current, and protects a single-cell rechargeable lithium battery from damage due to overcharge voltage, over-discharge voltage, overcharge current, over-discharge current, and short circuit by disconnecting the charger or load. The system has a simple external circuit. The MOSFET is built-in, with a typical equivalent resistance of 65mΩ.

 

3.1 Charger detection; 0V battery charging function; internally set delay time; high-precision voltage detection.

3.2 Low quiescent current: Normal operating current: 2.8uA; Standby current: 1.5uA; RoHS and lead-free compliant.

 

4. Slkor DW03 Lithium Battery Protection Application in Electric Shaver Solution:

 

Figure 1

 

Figure 2

 

Figure 3

 

5. Application Principle

 

Slkor single-cell lithium battery protection DW03. The DW03 includes an advanced power MOSFET, high-precision voltage detection circuits, and delay circuits, and is widely used in small household appliances. In the shaver application circuit shown in the figure, USB Type-C supplies power to charge the single-cell lithium battery. During charging, the MCU's ADC I/O port collects the charging voltage and displays the battery level on a digital tube. The charging circuit is built with Slkor SL4056 charging management and simple peripheral circuits. In the motor drive section, Slkor 3400 MOSFET is used, and the MCU I/O port collects key signals to control the motor on/off. DRV is the gate drive signal. When the MCU detects that the key is pressed, DRV outputs a high level and the shaver starts to rotate.

 

5.1 Figure 1 is only a reference circuit for the MCU to collect lithium battery charging. Note that the DW03 connects to the positive terminal of the lithium battery through a 100R resistor, pin 2 of the chip connects to the negative terminal of the lithium battery, and pins 4 and 5 connect to GND. Users can follow the specifications to design and easily build a corresponding single-cell lithium-ion battery protection circuit.

 

The DW03 protects a single-cell rechargeable lithium battery from damage due to overcharge voltage, over-discharge voltage, overcharge current, over-discharge current, and short circuit. If no abnormal conditions are detected, the output transistor remains on, and charging and discharging can switch freely. This is called normal operation mode. During normal discharging, when the battery voltage drops below the over-discharge detection voltage (VDL) and the duration reaches or exceeds the over-discharge voltage detection delay time (TDL), the DW03 disconnects the battery from the load and stops discharging.

 

This is called over-discharge voltage condition. In normal operation mode, when the discharge current is equal to or higher than the set value (VM voltage is equal to or higher than the overcurrent detection voltage) and the duration reaches the over-discharge current detection delay time, the DW03 turns off the discharge FET and stops discharging. This is called over-discharge current condition. During normal charging, if the VM voltage drops below the charge detection voltage (VCHA) and the duration exceeds the overcharge current detection delay time (TCU), the DW03 turns off the charge FET and stops charging. This is called abnormal charge current detection, etc.

 

5.2 In Figure 2, the bidirectional TVS for surge protection is Slkor SMF5.0CA, with VRWM voltage of 5.0V and excellent clamping capability, with a peak pulse power capability of 200W under 10/1000 µs waveform. Q2 and Q4 are both Slkor MOSFETs. The MCU enable signal controls Q2 to turn on Q4, and after Q4 conducts, Type-C outputs voltage VCC to power the load.

 

5.3 In Figure 3, D4 and D5 mainly serve as a battery and Type-C power switching circuit. When the charger is unplugged, the lithium battery supplies power. D4 and D5 are Slkor 1N5819WT Schottky diodes, with reverse leakage current of 1uA, voltage rating of 40V, maximum forward current of 1A, and low forward voltage drop, making them very suitable for low-current applications such as MCUs.

 

6. Slkor DW03 Lithium Battery Protection Application BOM Table Information is as follows:

 

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