Slkor DW01A: Smarter Lithium Battery Protection for a Safer, Longer-Lasting Future

Shenzhen Slkor Micro Semicon Co., Ltd. draws its core technical strength from Tsinghua University and is at the forefront of innovation in new materials, processes, and products. Specializing in third-generation semiconductor technology, Slkor has achieved international leadership in silicon carbide (SiC) power devices.

As a high-tech enterprise integrating design, development, production, and sales, Slkor delivers not only high-performance electronic components but also comprehensive technical support—helping customers worldwide build more efficient, reliable, and future-ready solutions.

1.1 Name: Slkor DW01A Lithium Battery Protection Solution

1.2 Applications:
Designed for high-precision lithium battery protection circuits, including rechargeable phone batteries, e-cigarettes, and other consumer or industrial devices requiring reliable charge and discharge protection.
Key functions include:
– Overcharge & Overcharge Recovery
– Over-discharge & Over-discharge Recovery
– Overcurrent & Short-circuit Detection

2.1 Product Highlights

• Comprehensive Protection Logic:
  Under normal conditions, the DW01A ensures stable charging and discharging by keeping the CO and DO pins high, activating external N-MOSFETs for charge (Q1) and discharge (Q2) control.

• Smart Protection Response:
  Monitors voltage levels at VDD and VM pins; automatically cuts off charging or discharging when thresholds are exceeded, then seamlessly resumes once conditions return to normal.

• Built-in Recovery & Delay:
  Each protection and recovery mode includes preset delay times to avoid false triggers, ensuring reliability and safety.

• Precise Thresholds:
  • Overcharge Cut-off: 4.3V
  • Overcharge Recovery: 4.1V
  • Over-discharge Cut-off: 2.5V (verify per your variant)

3. Wide Operating Range:
Performs reliably from –40°C to +85°C, making it suitable for rugged environments and high-demand applications.

4. Example Application:

The Slkor DW01A delivers stable, reliable lithium battery protection for modern devices such as e-cigarettes, ensuring safe charging, discharging, and long battery life.

 

5. Application Principle

When airflow passes through the microphone (mic), it generates an analog signal. Once the signal reaches a defined threshold, it triggers an interrupt to wake up the MCU. The MCU then drives the MOSFET to heat the coil (heater), producing vapor/smoke, and simultaneously powers on the LED.
When the MCU detects that the analog signal has weakened or stopped, it cuts power to the MOSFET and enters low-power mode. The MCU continuously monitors battery voltage:

• If voltage drops below the minimum threshold, the system goes to sleep.

• If the minimum threshold is reached, the LED flashes to indicate low voltage.

5.1 Display & Battery Management

A display screen (see block diagram) shows battery voltage and power status. The MCU, as the main control unit, provides over-discharge and under-voltage protection, and also supervises the charging process. When a USB port is connected, the MCU decides whether to initiate charging.

5.2 Power Input
The power input terminal adopts a Kinghelm Type-C 16-pin connector, valued for its excellent anti-interference performance and high reliability in the market.
Kinghelm has specialized in wireless signal transceivers, electronic connectors, and interconnection system products for over a decade. Its portfolio now covers board-to-wire connectors, board-mounted sockets, plugs, and switch series—serving global customers with consistent quality.

5.3 Charging Circuit
Figure 1 highlights the Slkor SL4056E, which features built-in reverse battery connection protection. If the lithium battery is connected incorrectly, the SL4056E shuts down safely with no charging current and both LEDs off.
The charging current is set via the PROG resistor:

Typical formula: I_CHG (mA) = 1000 / R_PROG (kΩ)

Select the resistor based on the actual battery capacity (verify with the official SL4056E

datasheet for your variant).

5.4 Battery Protection Circuit
Figure 3 shows the Slkor DW01A lithium battery protection circuit. B+ connects to both the positive terminal of the lithium cell and the load.
Combined with the Slkor SL8820 dual MOSFET, this setup provides:

• Overcurrent protection

• Overvoltage protection

• High-precision charge/discharge management

The DW01A series is a trusted, high-accuracy protection IC for single-cell lithium batteries.

5.5 Voltage Regulation & Detection
Also in Figure 3:

• Slkor AMS1117-3.3: a low-dropout (LDO) regulator delivering up to 1 A (typical), requiring only two 10 µF capacitors. For the SOT-89 package, up to 300 mA is recommended.

• Battery detection circuit uses Slkor S8050 transistor: With the MCU driving the C1 terminal high, the transistor turns on to allow ADC voltage sampling (ADC1/ADC2). Most of the time, C1 stays low, ensuring ultra-low standby power consumption.

6. Bill of Materials (BOM)
For detailed BOM data on the Slkor DW01A lithium battery protection application circuit for e-cigarettes, please contact slkoric@slkormicro.com.

Slkor delivers comprehensive product information and robust technical support to help end customers and distributors seamlessly adopt and integrate the latest “SLKOR” products.