ACT4533B
40 V, 3 A, Active CC, High-Efficiency Step-Down Converter
Key Features
- 40 V input voltage surge
- 36 V steady state operation
- Up to 3.5 A output current
- Output voltage up to 12 V
- 125 kHz switching frequency eases EMI design
- 91% efficiency (Vout = 5V @ 2.4 A at Vin = 12 V)
- Stable with low ESR ceramic capacitors to allow low-profile designs
- Patent Active CC sensorless constant current control improves efficiency and lowers cost
- Integrated over-voltage protection
- Excellent EMI performance
- +/- 7.5% CC accuracy
- 2% feedback voltage accuracy
- Advanced feature set
Qorvo's ACT4533B is a wide input voltage, high efficiency Active CC step-down DC/DC converter that operates in either CV (Constant Output Voltage) mode or CC (Constant Output Current) mode. ACT4533B provides up to 3.5 A output current at 125 kHz switching frequency.
Active CC is a patented control scheme to achieve high-accuracy sensorless constant current control. Active CC eliminates the expensive, high accuracy current sense resistor, making it ideal for Cigarette Lighter Adapter (CLA) applications.
ACT4533B integrates adaptive gate drive to achieve excellent EMI performance, passing the EN55022 Class B EMC standard without adding additional EMI components while maintaining high conversion efficiency.
Protection features include cycle-by-cycle current limit, thermal shutdown and frequency foldback at short circuit.
The only difference between ACT4533A and ACT4533B is that Pin 7 provides OVP for ACT4533A and EN/OVP for ACT4533B.
ACT4533B is available in a SOP-8EP package and require very few external components for operation.
Typical Applications
- Car Chargers / Adapters
- Rechargeable Portable Devices
- General Purpose CC/CV Power Supplies
Product Categories
| Topology | Buck |
| Min Input Voltage(V) | 10 |
| Max Input Voltage(V) | 40 |
| Max Output Current(A) | 3.5 |
| Pin Count | 8 |
| Operating Junction Temperature(C) | -40 to 150 |
| Frequency(kHz) | 125 |
| ActiveCharge™ with Qualcomm QC 2.0 | No |
| AEC-Q100 | No |
| Cable Compensation | Yes |
| Sensorless CC Control | Yes |
| Package Type | SOP-8EP |
| Package(mm) | 5.0 x 6.0 |
| RoHS | Yes |
| Lead Free | Yes |
| Halogen Free | Yes |
| ITAR Restricted | No |
| ECCN | EAR99 |