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Qorvo ACT4533AYH-T
- Part No.:
- ACT4533AYH-T
- Manufacturer:
- Qorvo
- Package:
- 8-SOIC (0.154", 3.90mm Width) Exposed Pad
- Datasheet:
-
ACT4533AYH-T.pdf
- Description:
- IC REG BUCK ADJ 3.5A 8SOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,164
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Product details
Overview
ACT4533AYH-T from Qorvo is a wide-input, sensorless constant-current/constant-voltage (CC/CV) step-down DC/DC converter optimized for automotive and industrial power supplies. It delivers up to 3.5 A output current at 125 kHz switching frequency, supports 10–38 V input range with 40 V surge tolerance, and regulates output voltage up to 12 V with ±2% feedback accuracy - enabling robust 5 V/2.4 A car charger designs.
For engineers reviewing the ACT4533AYH-T datasheet, pinout, applications, or equivalent options, key selection criteria include its patented ActiveCC sensorless CC control, OVP-only Pin 7 configuration, SOP-8EP thermal performance (46 °C/W), and resistor-programmable current limit (1.5–4.0 A) without external sense resistors.
Technical Context
The ACT4533AYH-T implements peak-current-mode PWM control with dual CV/CC regulation loops. Its ActiveCC architecture eliminates the need for high-accuracy current-sense resistors by using inductor DCR-independent sensing, while adaptive gate drive ensures EN55022 Class B EMI compliance without added filters.
It features integrated soft-start (400 µs), thermal shutdown (155 °C trip, 25 °C hysteresis), secondary cycle-by-cycle current limiting (6.8 A), and programmable cable compensation (0–0.25 Ω). Pin 7 functions exclusively as OVP input (0.8 V threshold), distinguishing it from the ACT4533BYH-T's combined EN/OVP functionality.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 10–38 V continuous, 40 V surge - supports 12 V/24 V automotive and industrial rails with transient resilience. |
| Output Current | Up to 3.5 A - sufficient for 5 V/2.4 A car chargers and 24 V-to-intermediate buck converters. |
| Switching Frequency | 125 kHz fixed - simplifies EMI filter design and enables use of standard low-cost inductors. |
| Feedback Voltage Accuracy | ±2% (0.792–0.824 V) - ensures tight CV regulation across temperature and line conditions. |
| CC Accuracy | ±7.5% - maintains stable charging current despite input/output voltage shifts, temperature drift, and inductor variation. |
| Thermal Resistance | 46 °C/W (junction-to-ambient) - enables high-power operation in SOP-8EP with proper PCB copper area and vias. |
| OVP Threshold | 0.8 V on Pin 7 - provides fast overvoltage shutdown for system-level protection without external circuitry. |
Pinout & Package
SOP-8EP (exposed pad) package measuring 4.9 × 6.0 mm with 1.27 mm pitch; requires thermal connection of exposed pad to large GND copper area via multiple vias for optimal heat dissipation and noise immunity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (HSB) | High-side bias supply | Provides gate drive voltage for internal high-side MOSFET; requires 22 nF capacitor to SW for stable bootstrap operation. |
| 2 (IN) | Main power input | Accepts 10–38 V input; must be bypassed with ≥10 µF ceramic capacitor placed adjacent to IC for ripple suppression. |
| 3 (SW) | Power switch node | Connects to external inductor; experiences high dv/dt switching transitions - requires short, low-inductance routing. |
| 4 (GND) | Signal and power ground | Reference for FB, COMP, ISET; must tie to power GND at single point and connect to exposed pad for thermal and noise control. |
| 5 (FB) | Voltage feedback input | Regulated to 0.808 V; sets output voltage via resistor divider - supports cable compensation via RFB1 impedance tuning. |
| 6 (COMP) | Error amplifier output | Internal compensation node; external RC network stabilizes CV loop - no additional CC loop compensation needed. |
| 7 (OVP) | Overvoltage protection input | Shuts down high-side switch if voltage exceeds 0.8 V; dedicated OVP function (no enable capability) for ACT4533AYH-T. |
| 8 (ISET) | Current limit programming | Resistor from ISET to GND sets CC output (1.5–4.0 A); 1.0 V reference enables precise, temperature-compensated current setting. |
Key Features
| Feature | Design Value |
|---|---|
| Patented ActiveCC control | Enables sensorless constant-current regulation with ±7.5% accuracy - eliminates costly precision current-sense resistors and associated board space. |
| Integrated OVP (Pin 7) | Dedicated 0.8 V threshold shutdown protects downstream loads from overvoltage events without external comparators or dividers. |
| Stable with ceramic capacitors | Operates reliably with low-ESR ceramic output caps (e.g., 22 µF) - enables ultra-low-profile, high-reliability designs versus electrolytic alternatives. |
| EMI-optimized gate drive | Passes EN55022 Class B emissions without external filters - reduces BOM count and layout complexity in space-constrained adapters. |
| Resistor-programmable cable compensation | Adjusts output voltage dynamically to offset IR drop across charging cables (0–0.25 Ω range) - maintains accurate CC delivery at load end. |
Applications
| Automotive USB-C Car Charger | 24 V Industrial Buck Converter |
|---|---|
Use Scenario: 12 V vehicle battery powering dual-port 5 V/2.4 A USB charging with overvoltage and thermal protection. IC Role / Device Role / Timing Role: Primary CC/CV buck controller managing both voltage regulation and constant-current charging phases. Use Value: Eliminates current-sense resistor, reducing BOM cost and PCB area while maintaining ±7.5% CC accuracy across temperature and input voltage variation. | Use Scenario: Converting nominal 24 V industrial rail to stable 4–5 V intermediate supply for PLC I/O modules or sensors. IC Role / Device Role / Timing Role: High-efficiency step-down regulator operating in CV mode with built-in UVLO (9.4 V turn-on) and thermal shutdown. Use Value: 91% efficiency at 5 V/2.4 A and 125 kHz switching enable compact, fanless designs meeting EN55022 Class B without added EMI components. |
| Rechargeable Portable Power Bank | CV/CC LED Driver Supply |
Use Scenario: Charging lithium-ion battery packs from variable-input sources (solar, USB PD, or wall adapter) with precise CC/CV transition. IC Role / Device Role / Timing Role: Core battery charging controller implementing seamless handoff between constant-current and constant-voltage stages. Use Value: ActiveCC's independence from inductor DCR and temperature ensures consistent CC delivery regardless of component aging or ambient changes. | Use Scenario: Driving high-brightness LEDs requiring tightly regulated current and voltage with cable-drop compensation for remote fixtures. IC Role / Device Role / Timing Role: Constant-current source with programmable output (1.5–4.0 A) and dynamic voltage headroom adjustment. Use Value: Integrated cable compensation maintains target LED current at fixture terminals despite long wiring runs - critical for uniform illumination in architectural lighting. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar constant-current/constant-voltage buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ACT4533BYH-T | Same silicon, but Pin 7 is EN/OVP (0.65 V enable, 2.26 V OVP) instead of OVP-only; identical electrical specs and package. | Requires external pull-up or enable logic for startup; supports controlled sequencing in multi-rail systems where ACT4533AYH-T's fixed-OVP behavior is insufficient. | Select ACT4533BYH-T only when system-level enable control is required; ACT4533AYH-T is preferred for simpler OVP-only protection. |
| MP24894GQ-Z | Monolithic 36 V, 3 A CC/CV buck with integrated high-side MOSFET; lacks ActiveCC - uses traditional current-sense resistor; 200 kHz switching; different pinout and compensation scheme. | Requires external 0.01 Ω sense resistor and separate OVP circuitry; higher BOM count and larger footprint than ACT4533AYH-T's resistor-programmable, sensorless design. | Choose MP24894GQ-Z only if higher switching frequency or alternate package (QFN-16) is mandatory; ACT4533AYH-T offers lower system cost and smaller solution size. |
Compared with ACT4533BYH-T, ACT4533AYH-T provides simpler OVP-only protection without enable logic overhead; compared with MP24894GQ-Z, it eliminates the current-sense resistor and associated layout sensitivity while delivering superior CC accuracy and EMI performance in the same SOP-8EP footprint.
Availability
ACT4533AYH-T is available at Aetrix Electronics and suitable for automotive USB charging, 24 V industrial power conversion, and rechargeable portable device applications requiring stable component supply, long-term lifecycle support, and production-ready qualification.
Supply support for ACT4533AYH-T includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Qorvo is a U.S.-based semiconductor company specializing in RF, power, and broadband solutions for mobile, infrastructure, and defense markets.
The ACT4533A/B product line was designed specifically for cost-sensitive, high-volume CC/CV DC/DC applications such as automotive adapters and industrial buck converters - emphasizing sensorless current control, EMI robustness, and minimal external component count.
FAQ
What is the maximum continuous input voltage rating for ACT4533AYH-T?
The ACT4533AYH-T supports a steady-state input voltage range of 10 V to 38 V, with an absolute maximum surge rating of 40 V. This allows reliable operation across 12 V and 24 V automotive and industrial bus voltages, including cold-crank and load-dump transients when properly clamped externally. The device incorporates UVLO with 9.4 V turn-on and 1.1 V hysteresis to ensure clean startup under marginal input conditions.
How does ACT4533AYH-T achieve constant-current regulation without a current-sense resistor?
The ACT4533AYH-T uses Qorvo's patented ActiveCC sensorless control architecture to derive output current information from inductor voltage and timing measurements - eliminating the need for a discrete current-sense resistor. This approach provides ±7.5% CC accuracy across input/output voltage changes, temperature, and inductor variations, while reducing BOM cost and PCB area. The ISET pin accepts a resistor to program the target current from 1.5 A to 4.0 A.
What is the function of Pin 7 on ACT4533AYH-T, and how does it differ from ACT4533BYH-T?
Pin 7 on ACT4533AYH-T is dedicated solely to Overvoltage Protection (OVP) with a 0.8 V threshold - triggering immediate shutdown of the high-side switch if exceeded. In contrast, ACT4533BYH-T's Pin 7 serves dual EN/OVP functionality: it enables the device above 0.65 V and triggers OVP shutdown above 2.26 V. This makes ACT4533AYH-T ideal for systems requiring simple, unconditional OVP without enable sequencing logic.
Can ACT4533AYH-T be used with ceramic output capacitors, and what value is recommended?
Yes, ACT4533AYH-T is fully stable with low-ESR ceramic output capacitors - a key design advantage enabling low-profile, high-reliability implementations. For typical 5 V output applications, a 22 µF X5R/X7R ceramic capacitor rated for ≥10 V is recommended. The IC's internal compensation eliminates the need for additional ESR-based zero networks, unlike controllers requiring tantalum or electrolytic capacitors with ≥50 mΩ ESR.
Does ACT4533AYH-T include thermal protection, and what are its trip and recovery thresholds?
Yes, ACT4533AYH-T integrates thermal shutdown protection that disables switching when junction temperature exceeds 155 °C. Recovery occurs automatically once the die temperature falls by 25 °C (i.e., below 130 °C), providing hysteresis to prevent oscillation near the trip point. The SOP-8EP package's 46 °C/W thermal resistance requires adequate PCB copper area and thermal vias under the exposed pad to sustain full 3.5 A output current in ambient temperatures up to 85 °C.
ACT4533AYH-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Qorvo
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width) Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 10V
- Voltage - Input (Max):
- 38V
- Voltage - Output (Min/Fixed):
- 0.808V
- Voltage - Output (Max):
- 12V
- Current - Output:
- 3.5A
- Frequency - Switching:
- 125kHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOP-EP
ACT4533AYH-T FAQ
1.How can I place an order for ACT4533AYH-T through Aetrix?
Please submit a Request for Quotation (RFQ) for ACT4533AYH-T on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for ACT4533AYH-T reliable?
The price and inventory of ACT4533AYH-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ACT4533AYH-T is usually 5 days.
3.What payment methods are accepted for ACT4533AYH-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ACT4533AYH-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ACT4533AYH-T?
ACT4533AYH-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ACT4533AYH-T order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for ACT4533AYH-T?
For technical support, including ACT4533AYH-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ACT4533AYH-T requirements.
6.How does Aetrix verify that ACT4533AYH-T is sourced from the original manufacturer or authorized distributors?
All ACT4533AYH-T products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that ACT4533AYH-T meets industry standards.
7.What is the process for return or replacement of ACT4533AYH-T?
All ACT4533AYH-T units undergo pre-shipment inspection (PSI). If there is an issue with ACT4533AYH-T, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The ACT4533AYH-T part is unused and in its original packaging.
Return procedure for ACT4533AYH-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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