Overview
The CAT3224HV3-GT2 is a high-current integrated flash LED driver designed by onsemi. It is ideal for Li-ion battery-powered systems and supports the charging function for dual-cell supercapacitor applications. This device delivers up to 4.0 A LED flash pulses, exceeding the peak current capability of the battery. It features a dual-mode 1x/2x charge pump that charges the stacked supercapacitor to a nominal voltage of 5.4 V, with an active balance control circuit ensuring matched capacitor cell voltages. The device is packaged in a compact 16-pad TQFN package measuring 3 mm x 3 mm with a maximum height of 0.8 mm.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| VIN (Input Voltage) | 2.5 to 5.5 | V |
| VOUT (Output Voltage) | Up to 5.5 | V |
| Flash Mode Current | Up to 4.0 A (2 channels at 2.0 A each) | A |
| Torch Mode Current | Up to 400 mA (2 channels at 200 mA each) | mA |
| Charge Current Limit | Up to 1000 mA | mA |
| Charge Pump Frequency | 800 kHz | kHz |
| Flash Timeout Duration | 300 ms | ms |
| Package Type | TQFN-16 | - |
| Package Dimensions | 3 mm x 3 mm x 0.8 mm | mm |
| Thermal Shutdown | 150 °C | °C |
| Undervoltage Lockout (UVLO) Threshold | 1.9 V | V |
Key Features
- Dual-mode 1x/2x charge pump for charging dual-cell supercapacitors to a nominal voltage of 5.4 V.
- Active balance control circuit to ensure matched capacitor cell voltages.
- Adjustable charge current limit up to 1000 mA.
- Two matched current sources for flash and torch modes, adjustable via external resistors.
- Built-in safety timer to terminate flash pulses beyond 300 ms.
- Thermal shutdown and overvoltage protection.
- Protection against external resistor programming faults and reverse output voltage.
- Zero current shutdown mode and low standby current (80 µA).
- Pb-free, halogen-free/BFR-free, and RoHS compliant.
Applications
- High power LED flash applications.
- Systems with high peak loads, such as camera flash in smartphones and other portable devices.
- Li-ion battery-powered systems requiring high current pulses.
Q & A
- What is the maximum flash mode current of the CAT3224HV3-GT2?
The maximum flash mode current is up to 4.0 A, with each channel capable of delivering 2.0 A.
- What is the purpose of the dual-mode 1x/2x charge pump?
The dual-mode 1x/2x charge pump is used to charge the stacked supercapacitor to a nominal voltage of 5.4 V.
- How is the charge current limit adjusted?
The charge current limit is adjusted via an external resistor tied to the RC pin.
- What safety features does the CAT3224HV3-GT2 include?
The device includes a built-in safety timer, thermal shutdown, overvoltage protection, and protection against external resistor programming faults.
- What is the package type and dimensions of the CAT3224HV3-GT2?
The device is packaged in a 16-pad TQFN package measuring 3 mm x 3 mm with a maximum height of 0.8 mm.
- Is the CAT3224HV3-GT2 RoHS compliant?
- What is the typical charge pump frequency of the CAT3224HV3-GT2?
The typical charge pump frequency is 800 kHz.
- How does the active balance control circuit work?
The active balance control circuit ensures that both capacitor cell voltages remain matched by forcing the BAL pin to remain at half of the voltage of the CAP output.
- What is the undervoltage lockout (UVLO) threshold of the CAT3224HV3-GT2?
The UVLO threshold is 1.9 V.
- What is the thermal shutdown temperature of the CAT3224HV3-GT2?
The thermal shutdown temperature is 150 °C.
