ChipSourceTek-CST6118 Single channel brush DC motor drive chip solution

Ⅰ、Chip overview‌

‌    ChipSourceTek-CST6118‌  It is a high-performance single-channel written DC motor driver chip designed for low power consumption and high efficiency motor control scenarios. Its built-in full-bridge power MOS drive architecture, support ‌ forward/reverse/stop/brake ‌ function, with ‌1.8A continuous output current ‌ and ‌2.5A peak current ‌ capabilities, suitable for a wide range of small motor drive needs. The chip integrates overtemperature protection (TSD) and simplifies the peripheral circuitry through an optimized full-bridge drive design, significantly reducing system costs.

Ⅱ、Core characteristic‌

1. ‌Driving ability‌

   • Maximum continuous output current：‌1.8A‌
   • Peak output current: ‌2.5A‌ (transient)
   • On-resistance: ‌0.4Ω‌ (@1A current)

2. ‌ Working conditions‌

   • Wide voltage input range：‌1.5V~7.2V‌
   • Very low static power consumption: ‌<1μA‌ (typical value 0.1μA)
   • Encapsulation form：‌SOP-8‌

3. ‌ Functions and controls‌

   • Support motor ‌(forward, reverse, stop, brake ‌) four mode control
   • Built-in ‌ Thermal protection with hysteresis (TSD) ‌ to prevent overheating damage
   • Full bridge drive architecture, eliminate the peripheral filter circuit, simplify the design

Ⅲ、Typical application scenario‌

• ‌Consumer electronics‌：Electric toothbrush, electronic lock, remote control car, adult sex toys
• ‌Intelligent hardware ‌：Car mount, toy motor drive (e.g. 4WD, model)
• ‌Industrial equipment‌：Small automation equipment, low power actuator

Ⅳ、Typical application circuit design‌

1. ‌ circuit diagram description‌

   • ‌Motor bypass capacitance‌：The C4/104P capacitors must be connected in parallel at both ends of the motor. If the motor is not connected, reserve a capacitor position on the PCB.
   • ‌Peripheral reduction‌：Compared with traditional solutions, C1, C2 and C3 capacitors can be omitted to reduce the number of components and reduce costs.
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2. ‌ Pin definition (SOP-8 package)‌

   Pin number	name	Function description
   1	VCC	Power input（1.5-7.2V）
   2	IN1	Control signal input 1
   3	IN2	Control signal input 2
   4	GND	Ground connection
   5-8	OUT1~OUT2The motor drives the output

Ⅴ、Design advantage‌

1. ‌High integration ‌：Full bridge drive architecture reduces peripheral components and saves more than 30% PCB area.
2. ‌ Low power design‌：Static current <1μA, suitable for battery-powered scenarios (such as wireless devices).
3. ‌Strong anti-interference‌：Built-in filter and thermal protection, suitable for complex electromagnetic environment.
4. ‌Cost advantage ‌：By omitting the filter capacitor, the BOM cost is reduced by about 15%.

Ⅵ、Packaging and production information‌

• ‌Package specification ‌：SOP-8 (Patch Package)
• ‌ Recommended welding conditions‌：Reflow peak temperature ≤260℃, time ≤10 seconds.
• ‌Storage environment‌：-40℃~125℃, humidity <60%RH (non-condensing).

Ⅶ、Technical support‌

• furnish ‌Typical waveform diagram‌（Start/brake/reverse rotation timing）and ‌PCB Layout Reference‌。
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• Supports customized parameter adjustment (such as current limit and protection threshold).

‌ Remarks‌：The preceding solution can be optimized based on specific application scenarios. For complete technical documents or sample applications, contact the supplier.