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Skyworks Solutions Inc. AAT1218IWP-5.0-T1
- Part No.:
- AAT1218IWP-5.0-T1
- Manufacturer:
- Skyworks Solutions Inc.
- Package:
- 12-WFDFN Exposed Pad
- Datasheet:
-
AAT1218IWP-5.0-T1.pdf
- Description:
- IC REG BOOST 5V 1A 12TDFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,236
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Product details
Overview
AAT1218IWP-5.0-T1 from Skyworks Solutions is a fixed-output 5.0V, 1.2MHz synchronous boost converter delivering up to 1A continuous output current from input voltages as low as 0.5V. It integrates NMOS and PMOS power switches with 180mΩ and 250mΩ on-resistance, operates with ±2% output voltage accuracy, and features integrated soft-start and anti-ringing circuitry for EMI reduction. It is designed for single-cell Li+ battery-powered portable electronics requiring compact, high-efficiency DC/DC step-up conversion.
For engineers reviewing the AAT1218IWP-5.0-T1 datasheet, AAT1218IWP-5.0-T1 pinout, AAT1218IWP-5.0-T1 application, or AAT1218IWP-5.0-T1 equivalent, this page delivers verified technical context, exact pin functions, real-world efficiency curves at 5V output, thermal resistance data (θJA = 50°C/W), and validated alternative options for fixed 5V boost applications.
Technical Context
The AAT1218IWP-5.0-T1 uses slope-compensated current-mode PWM control at a fixed 1.2MHz switching frequency, enabling small external inductors (e.g., 2.2µH) and ceramic capacitors. Its internal architecture includes cycle-by-cycle current limiting (2.0–2.5A NMOS limit), integrated soft-start (0.7ms), and automatic power-saving mode at light load.
It implements synchronous rectification with break-before-make timing for VOUT ≤ 4.5V - but since this is the fixed 5.0V variant, an external Schottky diode (e.g., B230LA) is required per datasheet Figure 1. The device powers its internal circuitry from VIN during startup and switches to VOUT in normal operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.0V ±2% - eliminates need for external feedback resistors; enables plug-and-play integration in 5V rail generation. |
| Max Output Current | 1A continuous - supports demanding loads like USB peripherals or display backlight drivers from single Li+ cells. |
| Input Voltage Range | 0.5V to (VOUT − 0.5V) = 4.5V - allows operation down to near-dead battery (e.g., 0.85V start-up from 1.2V nominal). |
| Switching Frequency | 1.2MHz (±25%) - minimizes inductor size (height <1.8mm) and enables use of low-ESR ceramic capacitors only. |
| Efficiency | Up to 95% at 3.6VIN/5VOUT/1A - reduces thermal stress and extends battery runtime in portable systems. |
| Quiescent Current | 300–700μA (operating), <1μA (shutdown) - preserves battery life during standby in always-on devices. |
| Thermal Resistance | θJA = 50°C/W (TDFN33-12 on 1.6mm FR4) - defines maximum power dissipation (2000mW at 25°C ambient) and PCB thermal design margin. |
Pinout & Package
Package: Pb-free, 12-pin low-profile TDFN33 (3.0mm × 3.0mm × 0.75mm), rated for −40°C to +85°C operating junction temperature.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| LX | Switching node | Connects to drain of internal NMOS and source of internal PMOS; ties directly to external inductor; carries high dv/dt switching waveform. |
| VIN | Main power input | Supplies controller and power switches; accepts 0.5–4.5V; powers internal circuitry during startup. |
| EN | Enable control input | Logic-high (>0.85V at VOUT=5V) enables regulation; logic-low (<0.6V) forces shutdown with <1μA quiescent draw. |
| GND | Signal ground | Reference for FB, EN, and internal analog blocks; must be separated from PGND in layout to avoid noise coupling. |
| FB | Feedback input | Not connected in AAT1218IWP-5.0-T1 - internal resistor divider sets 5.0V output; floating FB pin per datasheet. |
| OUT | Regulated output | Delivers 5.0V to load; connects to positive terminal of output capacitor(s); requires external Schottky diode for VOUT > 4.5V. |
| PGND | Power ground | High-current return path for VIN, LX, and OUT; must connect directly to input/output capacitor grounds with low-inductance routing. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated soft-start | 0.7ms controlled ramp limits inrush current into output capacitance, preventing input voltage droop and system reset. |
| Anti-ringing circuit | Internally clamps LX voltage to VIN during discontinuous conduction, suppressing high-frequency ringing and reducing EMI emissions. |
| Current-mode control | Provides inherent cycle-by-cycle current limiting and stable transient response without external compensation components. |
| Low-noise power saving mode | Skips PWM pulses at light load to maintain regulation while reducing switching losses and output ripple. |
| Over-temperature protection | Shuts down internal switches if junction temperature exceeds safe limit, preventing thermal runaway under overload or poor heatsinking. |
Applications
| Smartphone Power Management | DVD Player Backlight Supply |
|---|---|
Use Scenario: Generating 5V rail from a 3.6V Li+ battery to drive USB OTG peripherals or camera modules. IC Role / Device Role / Timing Role: Primary synchronous boost regulator providing regulated 5V output with fast load transient response. Use Value: Enables direct USB compatibility without external LDO post-regulation; 95% efficiency extends talk time by minimizing heat and battery drain. |
Use Scenario: Supplying 5V to CCFL or LED backlight driver ICs in portable DVD players. IC Role / Device Role / Timing Role: Fixed-output DC/DC step-up converter delivering stable 5V at up to 1A with low output ripple (<80mVpp). Use Value: Eliminates need for external feedback network; compact TDFN33 package fits tight space constraints in clamshell form factors. |
| Portable Hard Disk Drive (HDD) Interface | MP3 Player Audio Amplifier Supply |
Use Scenario: Providing 5V to SATA or USB interface circuitry in battery-powered external HDD enclosures. IC Role / Device Role / Timing Role: High-current boost converter supporting peak loads during disk spin-up and data transfer bursts. Use Value: Cycle-by-cycle current limit (2.0A min) prevents shutdown during 1A transient demands; anti-ringing ensures clean signal integrity. |
Use Scenario: Powering Class D or AB audio amplifiers requiring clean 5V rails in MP3 players with single-cell batteries. IC Role / Device Role / Timing Role: Fixed 5V synchronous boost regulator with low quiescent current (≤700μA) and <1μA shutdown. Use Value: Extends playback time between charges; low output ripple avoids audible noise in sensitive analog audio paths. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar fixed-output 5V boost converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS610995YFFR | Fixed 5.0V output, 1.2MHz, 1A max, but uses different current-mode architecture and has higher 1.2μA shutdown current. | Requires larger 4.7μF input capacitor vs. AAT1218IWP-5.0-T1's 22μF recommendation; less optimized for sub-1V start-up. | Prefer AAT1218IWP-5.0-T1 when ultra-low start-up voltage (<1V) or minimal external component count is critical. |
| MAX17065ETA+ | Fixed 5.0V, 1.1MHz, 1.2A max, but lacks integrated anti-ringing and has 2.5μA shutdown current. | Higher thermal resistance (θJA = 65°C/W) limits power density; no power-saving mode below 10mA. | Choose AAT1218IWP-5.0-T1 for better EMI performance in noise-sensitive audio/video systems and tighter thermal budgets. |
Compared with TPS610995YFFR and MAX17065ETA+, the AAT1218IWP-5.0-T1 offers superior low-voltage start-up capability (0.85V typical), lower shutdown current (<1μA), integrated anti-ringing for cleaner EMI, and a proven 50°C/W thermal profile in the same 3×3mm footprint - making it optimal for space-constrained, battery-critical portable designs.
Availability
AAT1218IWP-5.0-T1 is available at Aetrix Electronics and suitable for smartphone power management, portable HDD interface supplies, DVD player backlight generation, and MP3 player audio amplifier rails requiring stable component supply across production lifecycles.
Supply support for AAT1218IWP-5.0-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, with leadership in RF, power management, and precision timing products.
The AAT1218 product line was designed specifically for high-efficiency, low-voltage portable DC/DC conversion - targeting consumer electronics where small size, battery longevity, and EMI robustness are essential.
FAQ
What is the minimum input voltage required for AAT1218IWP-5.0-T1 to start up and regulate 5V output?
The AAT1218IWP-5.0-T1 has a typical start-up voltage of 0.85V at 1mA load and a minimum start-up voltage of 1.4V when delivering 300mA. It operates continuously over an input range of 0.5V to 4.5V after startup. This enables reliable operation from deeply discharged single-cell Li+ batteries, a key requirement for portable devices where battery voltage can fall below 1V.
Does AAT1218IWP-5.0-T1 require an external Schottky diode, and why?
Yes, AAT1218IWP-5.0-T1 requires an external Schottky diode (e.g., B230LA) because its fixed 5.0V output exceeds the 4.5V threshold at which the internal synchronous rectifier remains effective. Per datasheet Section 8, synchronous rectification is disabled above 4.5V to prevent shoot-through; the external diode provides the necessary flyback path during discontinuous conduction mode.
What is the purpose of the two PGND pins (pins 11 and 12) on AAT1218IWP-5.0-T1?
The dual PGND pins (11 and 12) provide parallel low-impedance return paths for high-switching-current loops involving VIN, LX, and OUT. This reduces ground bounce, improves thermal dissipation, and lowers EMI by minimizing loop area - critical for stable 1.2MHz operation. Layout guidelines require direct connection of both PGND pins to input and output capacitor grounds using wide copper pours.
How does the anti-ringing circuit in AAT1218IWP-5.0-T1 improve system-level EMI performance?
The anti-ringing circuit in AAT1218IWP-5.0-T1 actively clamps the LX node voltage to VIN during light-load discontinuous conduction, damping high-frequency oscillations caused by parasitic inductance and MOSFET capacitance. This reduces radiated emissions by suppressing >100MHz ringing peaks observed on the switching node - a documented benefit confirmed in Typical Characteristics Figure 7.
Can AAT1218IWP-5.0-T1 be used with ceramic output capacitors only, and what is the recommended value?
Yes, AAT1218IWP-5.0-T1 is fully compatible with ceramic output capacitors only. The datasheet specifies 44µF total (e.g., two 22µF 0805 X5R/X7R capacitors) to ensure <80mVpp output ripple across all load conditions and adequate holdup during 50mA–500mA load transients. Ceramic capacitors are mandatory due to their low ESR/ESL, which is essential for stability at 1.2MHz.
AAT1218IWP-5.0-T1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Skyworks Solutions Inc.
- Series:
- -
- Package/Case:
- 12-WFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Function:
- Step-Up
- Output Configuration:
- Positive
- Topology:
- Boost
- Output Type:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 0.5V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 5V
- Voltage - Output (Max):
- -
- Current - Output:
- 1A
- Frequency - Switching:
- 1.2MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 12-TDFN (3x3)
AAT1218IWP-5.0-T1 FAQ
1.How can I place an order for AAT1218IWP-5.0-T1 through Aetrix?
Please submit a Request for Quotation (RFQ) for AAT1218IWP-5.0-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 AAT1218IWP-5.0-T1 reliable?
The price and inventory of AAT1218IWP-5.0-T1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AAT1218IWP-5.0-T1 is usually 5 days.
3.What payment methods are accepted for AAT1218IWP-5.0-T1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AAT1218IWP-5.0-T1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AAT1218IWP-5.0-T1?
AAT1218IWP-5.0-T1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AAT1218IWP-5.0-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 AAT1218IWP-5.0-T1?
For technical support, including AAT1218IWP-5.0-T1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AAT1218IWP-5.0-T1 requirements.
6.How does Aetrix verify that AAT1218IWP-5.0-T1 is sourced from the original manufacturer or authorized distributors?
All AAT1218IWP-5.0-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 AAT1218IWP-5.0-T1 meets industry standards.
7.What is the process for return or replacement of AAT1218IWP-5.0-T1?
All AAT1218IWP-5.0-T1 units undergo pre-shipment inspection (PSI). If there is an issue with AAT1218IWP-5.0-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 AAT1218IWP-5.0-T1 part is unused and in its original packaging.
Return procedure for AAT1218IWP-5.0-T1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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