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Skyworks Solutions Inc. AAT2785IRN-AAA-T1
- Part No.:
- AAT2785IRN-AAA-T1
- Manufacturer:
- Skyworks Solutions Inc.
- Package:
- -
- Datasheet:
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AAT2785IRN-AAA-T1.pdf
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Product details
Overview
AAT2785IRN-AAA-T1 from Skyworks Solutions is a three-channel synchronous step-down DC/DC converter IC designed for multi-rail power management in space-constrained portable electronics. It delivers 600mA per channel on channels 1 and 2, 1.5A on channel 3, with input range 2.7–5.5V, adjustable output from 0.6V to VIN, and fixed 1.8MHz switching frequency - enabling compact 4.7μH/1.5μH inductor solutions. It serves as the core voltage regulator for microprocessor core/IO, camera sensor rails, and USB peripheral power in smartphones and handheld instruments.
For engineers reviewing the AAT2785IRN-AAA-T1 datasheet, AAT2785IRN-AAA-T1 pinout, AAT2785IRN-AAA-T1 application, or AAT2785IRN-AAA-T1 equivalent, key selection criteria include independent enable control per channel, low-noise light-load mode, 100% duty-cycle dropout operation, thermal shutdown at 140°C, and TDFN34-16 package compatibility with high-density PCB layouts.
Technical Context
The AAT2785IRN-AAA-T1 implements peak current-mode control with fixed slope compensation (0.6A/μs for channels 1/2; 0.75A/μs for channel 3) to ensure stability across >50% duty cycles. Each channel features independent feedback (FB1/FB2/FB3), dedicated input pins (VP1_2, VP3), and separate power ground returns (PGND1/PGND2/PGND3) to minimize cross-regulator coupling.
It integrates P-channel high-side and N-channel low-side MOSFETs with RDS(ON) of 400mΩ/400mΩ (ch1/2) and 150mΩ/120mΩ (ch3), supports internal soft start (150μs turn-on), and includes over-temperature shutdown with 15°C hysteresis and current-limit protection triggered after four consecutive cycle overcurrent events.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.7V to 5.5V - supports single-cell Li-ion, USB VBUS, and regulated 3.3V/5V system rails without external pre-regulation. |
| Output Voltage Range | 0.6V to VIN - enables direct regulation of sub-1V processor cores and configurable I/O voltages via external resistor dividers. |
| Max Output Current | Ch1/2: 600mA; Ch3: 1.5A - matches typical load profiles for dual I/O rails + high-current core supply in mobile SoC designs. |
| Switching Frequency | 1.8MHz - permits use of small 4.7μH (ch1/2) and 1.5μH (ch3) inductors, reducing solution footprint by >40% vs. 500kHz converters. |
| Quiescent Current | Ch1/2: 50–100μA; Ch3: 45–90μA - maintains >80% efficiency down to ~85mA (ch1/2) and ~1.3A (ch3), critical for battery runtime. |
| Thermal Protection | 140°C shutdown with 15°C hysteresis - prevents thermal runaway during sustained overload or poor PCB heatsinking. |
| Enable Threshold | VIL = 0.6V, VIH = 1.4V - compatible with 1.8V/3.3V GPIO logic without level-shifting. |
Pinout & Package
The AAT2785IRN-AAA-T1 is housed in a Pb-free 16-pin TDFN34 (3.0mm × 4.0mm, 0.5mm pitch) package with exposed thermal pad (EP) requiring direct connection to PCB ground plane via ≥4 vias for thermal performance. Pin numbering follows standard top-view layout with EN1/EN2/EN3 enabling independent channel control.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PGND2, PGND1, PGND3 | Power ground returns | Separate return paths per channel minimize ground bounce and crosstalk between high-current (ch3) and sensitive low-current (ch1/2) outputs. |
| FB1, FB2, FB3 | Feedback inputs | High-impedance (0.2μA leakage) nodes accepting resistor dividers to set output voltage; referenced to AGND for precision regulation. |
| EN1, EN2, EN3 | Active-high enable inputs | Direct GPIO control with <1μA shutdown current; no external pull-up required for default-off sequencing. |
| LX1, LX2, LX3 | Power switching nodes | Connect to respective output inductors; LX1 shared by ch1/ch2; LX2/LX3 dedicated - enables optimized layout for dual-rail vs. high-current rail. |
| VP1_2, VP3 | Channel input supplies | Dedicated input pins allow separate decoupling: VP1_2 for dual 600mA rails, VP3 for 1.5A rail - reduces input ripple coupling. |
| AGND | Signal ground reference | Isolated from power grounds to prevent noise injection into error amplifiers and oscillator circuitry. |
Key Features
| Feature | Design Value |
|---|---|
| Low-noise light-load mode | Reduces spectral noise and output ripple during standby/sleep states without sacrificing transient response. |
| Independent channel enable | Enables precise power sequencing (e.g., core before I/O) and dynamic rail shutdown to extend battery life. |
| 100% duty-cycle operation | Maintains regulation down to VIN = VOUT, eliminating need for LDO post-regulators in dropout conditions. |
| Integrated soft-start | 150μs controlled ramp limits inrush current and prevents output overshoot during power-up. |
| Over-temperature hysteresis | 15°C recovery margin prevents thermal cycling and ensures stable re-entry after fault clearance. |
Applications
| Smartphone Core/IO Power | Digital Camera Sensor Rails |
|---|---|
Use Scenario: Powering application processor core (1.2V/1.5A), memory I/O (3.3V/600mA), and interface logic (3.3V/600mA) from single Li-ion battery. IC Role / Device Role / Timing Role: Triple-output buck regulator providing isolated, sequenced, and efficient DC power rails with minimal external components. Use Value: Eliminates need for discrete regulators or PMICs, reducing BOM count by 3× and PCB area by >30% versus dual-IC solutions. | Use Scenario: Supplying image sensor analog (2.8V), digital (1.8V), and interface (3.3V) rails in compact digital cameras with fast wake-up requirements. IC Role / Device Role / Timing Role: Multi-rail power manager delivering fast 150μs turn-on and low-noise regulation to preserve image SNR. Use Value: Achieves <10mVpp output ripple at full load, preventing sensor banding artifacts and enabling clean analog signal paths. |
| USB Peripheral Power Hub | Handheld Instrument MCU System |
Use Scenario: Regulating 5V USB input to 3.3V (600mA), 1.8V (600mA), and 1.2V (1.5A) for USB-C hub IC, PHY, and controller in portable accessories. IC Role / Device Role / Timing Role: High-efficiency buck converter supporting USB PD input range while maintaining tight load regulation (<0.8%) across all channels. Use Value: Delivers >92% peak efficiency at 5V→3.3V/600mA, extending operating time in bus-powered devices without active cooling. | Use Scenario: Powering ARM Cortex-M7 MCU core (1.2V/1.5A), peripherals (3.3V/600mA), and ADC reference (3.3V/600mA) in battery-operated test equipment. IC Role / Device Role / Timing Role: Precision power source with ±3% output tolerance and <0.5% line regulation ensuring stable MCU clocking and accurate ADC conversions. Use Value: Maintains <±10mV output deviation across -40°C to +85°C, enabling reliable operation in industrial environments without recalibration. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar multi-channel buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS65023RSBR | 3-channel buck (600mA/600mA/600mA); 2.25MHz; integrated LDOs; I²C programmable | Lower max current on ch3 (600mA vs. 1.5A); adds LDOs but lacks 100% duty cycle | Select when system requires programmable voltage sequencing and auxiliary LDOs, not high-current core rail. |
| RT8059GQW | 3-channel buck (600mA/600mA/1.5A); 1.5MHz; no independent EN pins; smaller QFN20 package | Shared enable control; lower switching frequency increases inductor size; no PGND separation | Select when board space is critical and independent channel enable is not required for sequencing. |
Compared with TPS65023RSBR and RT8059GQW, the AAT2785IRN-AAA-T1 uniquely combines 1.5A channel capability, per-channel enable, and 100% duty-cycle operation - making it optimal for systems demanding high-current core regulation with flexible power sequencing and dropout resilience.
Availability
AAT2785IRN-AAA-T1 is available at Aetrix Electronics and suitable for smartphone power management, digital camera sensor rails, USB peripheral hubs, handheld instrument MCU systems, and portable media player subsystems requiring stable component supply and long-term production continuity.
Supply support for AAT2785IRN-AAA-T1 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
Skyworks Solutions is a global leader in analog and mixed-signal semiconductors, specializing in RF, power management, and timing solutions for wireless infrastructure, mobile, automotive, and industrial markets.
The AAT2785IRN-AAA-T1 belongs to Skyworks' Advanced Analog Power Management product line, engineered specifically for high-efficiency, multi-rail DC/DC conversion in battery-powered portable electronics where solution size and light-load efficiency are critical.
FAQ
What is the maximum output current supported by each channel of the AAT2785IRN-AAA-T1?
The AAT2785IRN-AAA-T1 supports up to 600mA on channels 1 and 2, and up to 1.5A on channel 3. These ratings are validated across the full -40°C to +85°C operating temperature range with appropriate PCB thermal design. Channel 3's higher current capability is enabled by lower RDS(ON) switches (150mΩ/120mΩ) and dedicated VP3/PGND3/ L X3 routing, as specified in the official Skyworks datasheet revision 202045A.
Does the AAT2785IRN-AAA-T1 support 100% duty-cycle operation, and under what conditions?
Yes, the AAT2785IRN-AAA-T1 supports true 100% duty-cycle operation when input voltage drops to or below the programmed output voltage. In this mode, the high-side P-channel MOSFET remains continuously on, allowing VOUT to track VIN minus the I·RDS(ON) drop. This behavior is explicitly documented in the Functional Description and Low Dropout Operation sections of the Skyworks datasheet, enabling seamless transition without requiring external LDOs.
How does the AAT2785IRN-AAA-T1 manage thermal protection, and what is the shutdown threshold?
The AAT2785IRN-AAA-T1 incorporates junction-level thermal protection that disables switching when die temperature reaches 140°C, with a 15°C hysteresis for recovery. This threshold is measured at the silicon junction and is independent of ambient or case temperature. The exposed pad (EP) must be soldered to a solid ground plane with ≥4 thermal vias to ensure effective heat dissipation, as detailed in the Thermal Calculations section of the datasheet.
Can the output voltages of the AAT2785IRN-AAA-T1 be adjusted, and what resistor values are recommended?
Yes, all three outputs are adjustable using external resistor dividers connected to FB1, FB2, and FB3. For channels 1 and 2, R2/R4 = 29.4kΩ with R1/R3 selected from 10kΩ (0.8V) to 267kΩ (3.3V) per Table 2. For channel 3, R6 = 59kΩ (or 221kΩ) with R5 scaled accordingly (e.g., 59.0kΩ for 1.2V output), as defined in Tables 2 and 3 of the Skyworks datasheet. Minimum resistor values balance quiescent current and noise immunity.
What package type and dimensions does the AAT2785IRN-AAA-T1 use, and are there thermal design requirements?
The AAT2785IRN-AAA-T1 uses a Pb-free 16-pin TDFN34 package measuring 3.0mm × 4.0mm with 0.5mm pitch and an exposed thermal pad (EP). Per Skyworks layout guidelines, the EP must be connected directly to the PCB ground plane using at least four 0.3mm-diameter vias to achieve the specified θJA = 50°C/W. Failure to implement proper thermal vias risks exceeding the 150°C maximum junction temperature under full load.
AAT2785IRN-AAA-T1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Skyworks Solutions Inc.
- Series:
- *
- Package/Case:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Function:
- -
- Output Configuration:
- -
- Topology:
- -
- Output Type:
- -
- Number of Outputs:
- -
- Voltage - Input (Min):
- -
- Voltage - Input (Max):
- -
- Voltage - Output (Min/Fixed):
- -
- Voltage - Output (Max):
- -
- Current - Output:
- -
- Frequency - Switching:
- -
- Synchronous Rectifier:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
AAT2785IRN-AAA-T1 FAQ
1.How can I place an order for AAT2785IRN-AAA-T1 through Aetrix?
Please submit a Request for Quotation (RFQ) for AAT2785IRN-AAA-T1 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 AAT2785IRN-AAA-T1 reliable?
The price and inventory of AAT2785IRN-AAA-T1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AAT2785IRN-AAA-T1 is usually 5 days.
3.What payment methods are accepted for AAT2785IRN-AAA-T1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AAT2785IRN-AAA-T1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AAT2785IRN-AAA-T1?
AAT2785IRN-AAA-T1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AAT2785IRN-AAA-T1 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 AAT2785IRN-AAA-T1?
For technical support, including AAT2785IRN-AAA-T1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AAT2785IRN-AAA-T1 requirements.
6.How does Aetrix verify that AAT2785IRN-AAA-T1 is sourced from the original manufacturer or authorized distributors?
All AAT2785IRN-AAA-T1 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 AAT2785IRN-AAA-T1 meets industry standards.
7.What is the process for return or replacement of AAT2785IRN-AAA-T1?
All AAT2785IRN-AAA-T1 units undergo pre-shipment inspection (PSI). If there is an issue with AAT2785IRN-AAA-T1, 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 AAT2785IRN-AAA-T1 part is unused and in its original packaging.
Return procedure for AAT2785IRN-AAA-T1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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