Atomizer Control Chip SOT23-5 EC0065U

EC0065U is designed for atomizers and utilizes an ASIC design to eliminate freezing issues commonly found in MCU-based solutions, as well as preventing the inability to reset the chip due to low critical voltage.

The EC0065U integrates microphone sensing detection, supporting direct microphone input with anti-interference processing to prevent false triggers. The chip includes a MOSFET discharge switch, allowing the atomizer coil current to exceed 3.6A, and it supports heating wires with resistance as low as 1.0 ohm. The chip operates stably and features short-circuit protection for the heating coil, cutting off output when the load resistance is less than 0.5 ohms. In power-saving mode, the quiescent current is only 2.2μA (Typ.). Additionally, it offers a visual LED working indicator, providing distinct LED signals during chip activation, vaping time, voltage detection, short-circuit protection, and charging.

The external application circuit is simple and easy to process, requiring minimal components, and the chip comes in a compact SOT23-5 package. With only one LED and one capacitor needed, the system offers low overall cost.

1. Specifications

Symbol Parameter Condition Min. Typ. Max. Unit
VBAT Operating Voltage 3.05 4.3 V
Vuvlo Low Voltage Detection Threshold 2.95 3.05 3.15 V
Iq Static Current Power Saving Mode 2.2 5 uA
Rdson Switch MOSFET on-resistance IAT=1A 75 mΩ
Iled LED Output Current 5 mA
RS Short-circuit Protection Threshold 0.5 Ω
VAT Constant Average Voltage Output VBAT=4.2V, IAT=1A 3.60 V
Rload Output Maximum Load Capacity 1.0 Ω
Iocp Overcurrent Protection 5 A
Dmin Minimum on-time Duty Cycle VBAT=4.2V 86 %
Tsd Over-temperature Protection Threshold 150 ℃
TSMOKE Smoking Timeout 10 S

2. Product Features

  • The peripheral circuit is simple and does not require an external MOSFET.
  • In power-saving mode, the static current is only 2µA (Typ.).
  • Supports heating element resistance as low as 0Ω.
  • 10-second long smoking protection.
  • 6V constant average voltage output.
  • Built-in short-circuit protection (SCP).
  • Built-in undervoltage lockout protection (UVLO).
  • Built-in over-temperature protection (OTP).
  • Multiple LED indicators: simulating the actual smoking process, showing chip startup, voltage detection, various protection mechanisms, and the charging process.

3. Typical Application Circuit Diagram

EC0065U Typical Application Circuit Diagram
Note: When designing the PCB layout, place capacitor C1 as close as possible to the BAT pin of the chip. Additionally, maximize the copper area near the GND pin of the chip to enhance heat dissipation.

4. Pin Diagram and Functional Description

Pin diagram Pin Name Pin Number Functional Description

EC0065U SOT23-5
SOT23-5
SW 1 Smoking detection, connected to microphone sensor
GND 2 Ground
LED 3 LED indicator
AT 4 Discharge output

5. Features

(1) Ultra-low quiescent current (<5µA)

(2) Multi-mode safe charging

(3) LED work indicators

(4) Protection control module

  • Once powered on, the chip directly enters power-saving mode. When not in use, the circuit remains in this mode, with a static current as low as 2uA (Typ.) in power-saving mode. Only during smoking does the chip switch from power-saving to normal operation. This extremely low static current consumption in power-saving mode effectively extends battery life after each charge.
  • LED Visual Indication Function: The LED indicators clearly display the system’s operational status, including chip activation, smoking duration, voltage detection, short-circuit protection, and charging process.
  • Protection Control Module: The EC0065U integrates an undervoltage lockout (UVLO) module to monitor the battery voltage. If the VBAT voltage is detected to be below 3.05V before smoking, the UVLO enable output activates, and the chip enters protection mode. The short-circuit protection (SCP) module detects atomizer coil overload and short circuits, with an LED indicator to signal alarms. The over-temperature protection (OTP) module regulates the system’s operating temperature, preventing overheating from affecting the chip’s lifespan.
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