Active-Semi’s automotive high-power DC/DC products are capable of charging two iPad® devices at 2.1A simultaneously, at a charging rate equivalent to a wall-plug power adapter. Our solutions achieve the strict “Made for iPad®” performance standards for power accessories such as over-voltage 40V pulse protection and strict over-current-protection (OCP) and constant-current constant-voltage (CC/CV) requirements.
Suitable for one-piece or two-piece car chargers, our solutions include cable/cord compensation circuitry that can be used to lower the cable cost while meeting electrical specifications at the device side charging connector.
The application circuit below shows a conventional ACT4513 enabled single-output charger. ACT4513 is a wide input voltage, high efficiency ActiveCC™ step-down DC/DC converter that operates in either CV (Constant Output Voltage) mode or CC (Constant Output Current) mode; providing up to 2A output current at 210kHz switching frequency. ActiveCC™ is a patent-pending control scheme to achieve highest accuracy sensorless constant current control, eliminating the conventional expensive current sense resistor. ActiveCC™ is featured throughout the ACT45xx product family.
Key Features & Benefits
- Meet MFi specs
- High efficiency
- Excellent EMI performance
- Reduced BOM for simplified PCB design
- Sophisticated Protection for Over Current (OCP), Over Voltage (OVP), Over Temperature (OTP) and Short Circuit Protections (SCP)
Product Selection Table
PART NUMBER | TOPOLOGY | FEATURES | INPUT VOLTAGE | MAX OUTPUT CURRENT | FREQ | PACKAGE | |||
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ASYNC BUCK | SYNC BUCK | CABLE COMPENSATION |
SENSORLESS CC CONTROL |
ACTIVECHARGE™ QUALCOMM® QC2.0/3.0 |
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ACT4524 New | x | x | x | 4.5-36V | 3.5A | 125kHz | SOP-8EP | ||
ACT4525 New | x | x | x | 6-36V | 3.5A | 125kHz | SOP-8EP | ||
ACT4526 New |
x | x | x | x | 6-36V | 3.0A | 125kHz | SOP-8EP | |
ACT4527 New | x | x | x | 6-36V | 3.0A | 125kHz | SOP-8EP | ||
ACT4528 New |
x | x | x | x | 6-36V | 3.0A | 125kHz | SOP-8EP | |
ACT4529 New |
x | x | x | x | 6-36V | 3.0A | 125kHz | SOP-8EP | |
ACT4529M (AEC-Q100) New |
x | x | x | x | 6-36V | 3.0A | 125kHz | SOP-8EP | |
ACT4501 | x | x | x | 10-30V | 1.25A | 125kHz | SOP-8 | ||
ACT4523 | x | x | x | 10-40V | 3.0A | 225kHz | SOP-8EP | ||
ACT4533 | x | x | x | 10-40V | 3.0A | 125kHz | SOP-8EP | ||
ACT4533A | x | x | x | 10-40V | 3.5A | 125kHz | SOP-8EP | ||
ACT4533B | x | x | x | 10-40V | 3.5A | 125kHz | SOP-8EP | ||
ACT4533C | x | x | x | 10-38V | 3.5A | 125kHz | SOP-8EP |
Learn more about applying our innovative power solutions for vehicle power adapters:
Car Charger (CLA) Applications
Part Number | Output Voltages | Output Currents | USB Auto Detection |
QC 2.0/3.0 | USB Type-C | USB-PD | Separated OCP | Datasheet | Application Note/ User Guide |
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ACT4533B | 5V | 2.4A/3.4A | x | Single Port | ![]() |
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ACT4525 | 5V | 2.4A + 1A | x | x | Yes Dual Port |
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ACT4526 | 5V/9V/12V | 3A | x | x | Single Port | ![]() |
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ACT4527 | 5V/9V/12V | 3A | x | Single Port | ![]() |
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ACT4528 | 5V/9V/12V | 3A | x | x | x | Single Port | ![]() |
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ACT4529-0001 | 5V/9V/12V | 3A | x | x | Single Port | ![]() |
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ACT4529-0010 | 5V/9V/12V | 3A | x | x | Single Port | ![]() |
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ACT4529-0011 | 5V/9V/12V | 3A | x | x | x | Single Port | ![]() |
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USB Type-C and USB-PD Evaluation Kits
For IC samples and EVKs, please contact sales@active-semi.com

ACT4533B Type-C
5V/3A New
- User Guide
- Schematics
- Layout Drawings
- Bill of Materials (BOM)
ACT4528 Type-C
5V/3A New
ACT4525 Type C + Type A Dual Port New
ACT4529 USB-PD
5V/12V/3A New
ACT4527 USB-PD
5V/12V/3A
Coming Soon