ACT4525
40 V, 3.5 A CC/CV Step-Down DC/DC Converter with USB Auto-Detect
Qorvo's ACT4525 is a wide input voltage, high efficiency step-down DC/DC converter that operates in either CV (Constant Output Voltage) mode or CC (Constant Output Current) mode.
ACT4525 has separated output current limits for dual port Cigarette Lighter Adapter (CLA) applications. With the separated current limits, the CLA can meet Apple's MFi standard.
The product provides up to 3.5 A output current at 125 kHz switching frequency. ACT4525 builds in USB auto-detect algorithms to recognize Apple, Samsung, and BC1.2 devices to ensure maximum charge current to attached devices. ACT4525 utilizes an adaptive drive technique to achieve good EMI performance while maintaining > 90% efficiency at full load for mini-size CLA designs. ACT4525 also has built-in output short circuit protection with hiccup mode. The average output current is reduced to below 6 mA when output is shorted to ground. Other features include output over-voltage protection and thermal shutdown.
ACT4525 is available in a SOP-8EP package and requires very few external devices for operation.
Key Features
- Passes Apple MFi test
- 40 V input voltage surge
- 4.5 to 36 V operational input voltage
- Dual 5.1 V outputs with 1% accuracy
- Up to 3.5 A output current
- 2.65 A constant current regulation for VOUT1
- 1.2 A constant current regulation for VOUT2
- Hiccup mode protection at output short
- > 90% efficiency at full load
- < 0.5 mA low standby input current
- 5.7 V output over-voltage protection
- Cord voltage drop compensation
- Meets EN55022 Class B radiated EMI standard
- 8 kV ESD HBM protection on DP and DM
- USB auto-detect supports Apple 2.4 A, Samsung and BC1.2 devices
Typical Applications
- Car Chargers
- Cigarette Lighter Adapters (CLAs)
- Rechargeable Portable Devices
- CV/CC Regulation DC/DC Converters
Parameters
Technical Documents
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