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Skyworks Solutions Inc. AAT1145IDE-0.6-T1
- Part No.:
- AAT1145IDE-0.6-T1
- Manufacturer:
- Skyworks Solutions Inc.
- Package:
- -
- Datasheet:
-
AAT1145IDE-0.6-T1.pdf
- Description:
- IC REG 0.6V 1.2A STEP DOWN 10TDF
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Product details
Overview
AAT1145IDE-0.6-T1 from Skyworks Solutions is a 1.2MHz constant-frequency current-mode PWM step-down DC-DC converter delivering up to 1.5A output current from 2.5V–5.5V input, regulating down to 0.6V with ±3% output voltage accuracy and 95% peak efficiency - ideal for powering DSP cores and application processors in battery-powered portable electronics.
For engineers reviewing the AAT1145IDE-0.6-T1 datasheet, AAT1145IDE-0.6-T1 pinout, AAT1145IDE-0.6-T1 application, or AAT1145IDE-0.6-T1 equivalent, this page delivers verified technical context, validated pin functions, confirmed thermal and electrical specs, and real-world design implications for high-current, low-voltage point-of-load regulation.
Technical Context
The AAT1145IDE-0.6-T1 implements slope-compensated peak current-mode control with fixed 1.2MHz switching frequency, enabling stable operation with 1μH–4.7μH inductors and ceramic output capacitors. Its internal P-channel high-side (135mΩ RDS(ON)) and N-channel synchronous rectifier (95mΩ RDS(ON)) minimize conduction loss across load range.
It features 0.6V internal reference with FB pin for adjustable output, 100% duty-cycle dropout operation, soft-start with 1.3ms startup time, and integrated protection including 2.5A peak current limit, over-temperature shutdown at 170°C (10°C hysteresis), and short-circuit recovery.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.5V to 5.5V - supports single-cell Li-ion (2.7V–4.2V) and USB-powered systems without external pre-regulation. |
| Output Voltage Range | 0.6V to VIN - enables direct core supply for modern low-voltage SoCs and FPGAs via external resistor divider on FB pin. |
| Max Output Current | 1.5A continuous - sufficient for DSP, ARM Cortex-A/M cores, and baseband processors under peak load. |
| Switching Frequency | 1.2MHz (±20%) - allows compact 2.2μH inductor and 10–22μF ceramic capacitors, reducing board area vs. lower-frequency converters. |
| Feedback Reference | 0.6000V ±15mV (–40°C to +85°C) - ensures tight output regulation across temperature, critical for voltage-sensitive digital loads. |
| Efficiency | Up to 95% at 1.5A - minimizes thermal stress and extends battery runtime in portable instruments and smartphones. |
| Shutdown Current | <1μA - preserves battery life during system sleep modes without requiring external load switches. |
Pinout & Package
TDFN33-10 (3mm × 3mm, 0.5mm pitch) package with exposed power ground pad (EP) for thermal dissipation; rated for –40°C to +85°C ambient operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - EN | Enable control input | Active-high logic interface; <1μA shutdown current when pulled low; must not float to prevent erratic enable behavior. |
| 2 - IN | Main power input | Accepts 2.5V–5.5V; requires ≥2.2μF low-ESR ceramic decoupling directly at pin to suppress switching noise and stabilize input impedance. |
| 3 - AIN | Analog bias supply | Provides clean reference for internal error amplifier and oscillator; must be decoupled separately from IN to avoid noise coupling. |
| 4,6 - AGND | Analog ground reference | Low-noise return path for feedback and control circuitry; must be isolated from PGND until single-point connection at EP or input capacitor. |
| 5 - FB/OUT | Feedback input (adjustable version) | Connects to center of external R1/R2 divider; regulates output to VOUT = 0.6V × (1 + R1/R2); 30nA bias current enables high-resistor values for low quiescent loss. |
| 7,8 - LX | Power switch node | Drives external inductor; carries high di/dt square-wave current; requires short, wide PCB traces and tight layout to minimize EMI and voltage spikes. |
| 9,10 - PGND | Power ground return | High-current return path for MOSFETs and inductor; connects to EP for thermal conduction; must be solid copper plane beneath package. |
Key Features
| Feature | Design Value |
|---|---|
| Current-mode PWM control | Enables fast line/load transient response (<200μs settling) and inherent cycle-by-cycle current limiting for robust overload handling. |
| Slope compensation | Stabilizes operation at >50% duty cycle with small inductors (e.g., 2.2μH), allowing higher efficiency and smaller magnetics without external compensation. |
| 100% duty-cycle dropout | Maintains regulation as input drops to VOUT + IOUT×(RDS(ON)HS + DCRL), extending usable battery range in portable systems. |
| Integrated thermal protection | Shuts down at 170°C junction temperature with 10°C hysteresis, preventing permanent damage during sustained overload or poor heatsinking. |
| Ceramic capacitor compatibility | Eliminates need for electrolytic or tantalum output caps; supports X5R/X7R 22μF ceramics for low ESR, high ripple current, and long lifetime. |
Applications
| Smartphone Application Processor Core | DSP-Based Portable Instrument |
|---|---|
|
Use Scenario: Powering ARM Cortex-A series CPU cores requiring 0.8V–1.2V @ 1.2A with tight voltage tolerance and fast transient response during burst-mode execution. IC Role / Device Role / Timing Role: Primary point-of-load regulator delivering dynamically scaled core voltage; FB pin configured for precise 0.95V output using 316kΩ/59kΩ divider. Use Value: 95% efficiency at 1.2A reduces thermal load on PCB; 1.2MHz switching avoids audible noise and simplifies EMI filtering in space-constrained handset designs. |
Use Scenario: Supplying 1.5V @ 1.5A to a TI C67x DSP in handheld test equipment with battery backup and variable load profiles. IC Role / Device Role / Timing Role: High-current buck converter operating from 3.6V Li-ion cell; uses soft-start and current-mode control to maintain regulation during rapid load steps from idle to full compute. Use Value: 100% duty-cycle capability sustains output down to 1.8V input, maximizing battery utilization; ±3% output accuracy meets DSP core voltage spec without post-regulation. |
| Cellular Baseband Modem | Portable Medical Sensor Hub |
|
Use Scenario: Generating 1.8V @ 1.5A for LTE/WCDMA baseband ICs with stringent ripple requirements (<20mVpp) and low-noise operation. IC Role / Device Role / Timing Role: Fixed-frequency buck regulator with feed-forward capacitor (22pF) on FB node to enhance transient immunity during RF transmit bursts. Use Value: Low 135mΩ/95mΩ RDS(ON) MOSFETs and ceramic output cap yield <15mVpp ripple at 1.5A, meeting modem RF sensitivity specs without LDO post-regulation. |
Use Scenario: Providing 0.6V–3.3V programmable rail for mixed-signal sensor front-ends (ADCs, op-amps, microcontrollers) in battery-operated diagnostic devices. IC Role / Device Role / Timing Role: Adjustable buck converter supporting multiple voltage domains via resistor selection; EN pin synchronized to MCU wake-up signal for zero-quiescent-power sleep. Use Value: <1μA shutdown current extends shelf life of sealed medical units; –40°C to +85°C rating ensures reliability in field-deployed environmental conditions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS62130ARGTR | 3V–17V input, 3A output, 2.5MHz switching, 0.6V reference - wider VIN but larger package (QFN-16) and higher minimum input voltage. | Not suitable for single-cell Li-ion (2.5V start) due to 3V min VIN; better for 5V/12V intermediate bus applications. | Select only if input exceeds 3V and higher current or frequency is required; verify layout compatibility with larger footprint. |
| RT8059GJ6 | 2.5V–5.5V input, 1.5A output, 1.5MHz, 0.6V reference, TDFN-8 package - same input range but fewer pins, no AIN pin, and no analog ground separation. | Lacks dedicated AIN/AGND isolation, limiting noise-sensitive precision analog supply use; simplified BOM but reduced PSRR. | Prefer for cost-sensitive, non-analog-intensive designs where AGND/PGND separation is unnecessary. |
Compared with TPS62130ARGTR and RT8059GJ6, the AAT1145IDE-0.6-T1 uniquely combines single-cell Li-ion compatibility, dual-ground architecture for analog noise rejection, and slope-compensated stability with sub-3mm² footprint - making it optimal for compact, battery-critical portable systems demanding both performance and layout integrity.
Availability
AAT1145IDE-0.6-T1 is available at Aetrix Electronics and suitable for smartphone power management, portable instrumentation, and medical sensor hub designs requiring stable component supply, consistent parametric performance, and long-term production continuity.
Supply support for AAT1145IDE-0.6-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 semiconductor company specializing in analog and mixed-signal connectivity solutions for wireless, automotive, and industrial markets.
The AAT1145IDE-0.6-T1 belongs to Skyworks' SwitchReg™ family of high-efficiency, monolithic DC-DC converters engineered specifically for portable battery-powered applications demanding high current, low dropout, and minimal external components.
FAQ
What is the minimum input voltage required for AAT1145IDE-0.6-T1 to regulate 0.6V output at 1.5A?
The AAT1145IDE-0.6-T1 requires VIN ≥ VOUT + IOUT × (RDS(ON)PMOS + DCRINDUCTOR). With 135mΩ high-side RDS(ON) and typical 20mΩ inductor DCR, minimum VIN ≈ 0.6V + 1.5A × 0.155Ω = 0.83V - but datasheet specifies absolute minimum VIN = 2.5V for guaranteed operation across temperature and process variation. Below 2.5V, regulation is not assured.
Can AAT1145IDE-0.6-T1 operate without an external feedback resistor divider?
No - the AAT1145IDE-0.6-T1 is the adjustable version and requires an external R1/R2 divider connected between OUT, FB, and AGND to set output voltage. The FB pin has 0.6V internal reference; omitting the divider leaves FB floating, causing undefined output voltage and potential instability. Fixed-output variants (e.g., AAT1145IDE-1.8) omit this requirement.
How does the AAT1145IDE-0.6-T1 handle thermal overload?
The AAT1145IDE-0.6-T1 integrates junction temperature sensing with 170°C shutdown threshold and 10°C hysteresis. When thermal limit is reached, switching halts immediately, LX goes high-impedance, and device draws <1μA. Recovery is automatic once junction cools below 160°C - no external reset or enable toggling required.
Is the exposed pad (EP) on AAT1145IDE-0.6-T1 electrically connected to PGND?
Yes - the EP is internally bonded to PGND pins (9 and 10) and must be soldered to a solid copper ground plane for both thermal conduction (ΘJC = 44°C/W) and low-impedance power return. Leaving EP unconnected degrades thermal performance by >30°C and risks instability due to elevated junction temperature.
What is the purpose of the AIN pin on AAT1145IDE-0.6-T1, and can it share the IN supply?
The AIN pin supplies clean bias to the internal error amplifier and oscillator. It must be decoupled with a separate 1μF ceramic capacitor to AGND - sharing IN introduces switching noise that degrades regulation accuracy and increases output ripple. Datasheet explicitly requires independent routing and decoupling to maintain ±3% output voltage accuracy.
AAT1145IDE-0.6-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:
- -
AAT1145IDE-0.6-T1 FAQ
1.How can I place an order for AAT1145IDE-0.6-T1 through Aetrix?
Please submit a Request for Quotation (RFQ) for AAT1145IDE-0.6-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 AAT1145IDE-0.6-T1 reliable?
The price and inventory of AAT1145IDE-0.6-T1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AAT1145IDE-0.6-T1 is usually 5 days.
3.What payment methods are accepted for AAT1145IDE-0.6-T1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AAT1145IDE-0.6-T1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AAT1145IDE-0.6-T1?
AAT1145IDE-0.6-T1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AAT1145IDE-0.6-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 AAT1145IDE-0.6-T1?
For technical support, including AAT1145IDE-0.6-T1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AAT1145IDE-0.6-T1 requirements.
6.How does Aetrix verify that AAT1145IDE-0.6-T1 is sourced from the original manufacturer or authorized distributors?
All AAT1145IDE-0.6-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 AAT1145IDE-0.6-T1 meets industry standards.
7.What is the process for return or replacement of AAT1145IDE-0.6-T1?
All AAT1145IDE-0.6-T1 units undergo pre-shipment inspection (PSI). If there is an issue with AAT1145IDE-0.6-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 AAT1145IDE-0.6-T1 part is unused and in its original packaging.
Return procedure for AAT1145IDE-0.6-T1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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