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Skyworks Solutions Inc. AAT3122ITP-T1
- Part No.:
- AAT3122ITP-T1
- Manufacturer:
- Skyworks Solutions Inc.
- Category:
- LED Drivers
- Package:
- -
- Datasheet:
-
AAT3122ITP-T1.pdf
- Description:
- IC LED DRIVER RGLTR DIM 12TSOPJW
- Quantity:
- Payment:
- Shipping:
Inventory:30,000
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Product details
Overview
AAT3122ITP-T1 from Skyworks Solutions is a high-efficiency, dual-mode (1X/1.5X) fractional charge pump LED driver IC designed for white LED backlighting in portable devices. It operates from 2.7V to 5.5V input, delivers up to 120mA regulated output current, and features a 32-level logarithmic S2Cwire™ brightness control interface. Its TSOPJW-12 package and four-external-component design support compact battery-powered applications such as smartphone LCD backlights.
For engineers reviewing the AAT3122ITP-T1 datasheet, AAT3122ITP-T1 pinout, AAT3122ITP-T1 application, or AAT3122ITP-T1 equivalent, key selection criteria include its 1MHz fixed-frequency operation, <1µA shutdown current, thermal protection, soft-start timing (200µs), and compatibility with 1µF ceramic flying capacitors - all critical for low-noise, space-constrained LED current source designs.
Technical Context
The AAT3122ITP-T1 integrates a dual-mode architecture combining a low-dropout linear regulator with a 1.5X fractional charge pump, automatically switching between 1X (load switch) and 1.5X modes based on real-time VIN–VOUT voltage comparison to maximize efficiency. Its internal feedback sensing circuit dynamically selects the optimal mode without external intervention.
It uses Skyworks' Simple Serial Control™ (S2Cwire™) interface on the EN/SET pin, decoding rising edges into 32 discrete current levels spaced 1dB apart - enabling perceptually linear LED brightness control. The device implements built-in thermal shutdown, soft-start (200µs), and back-injected noise suppression (<20mVpp) to ensure stable operation in RF-sensitive environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 2.7V to 5.5V - supports single-cell Li-ion and Li-poly battery operation across full discharge curve. |
| Max Output Current | 120mA - drives up to six white LEDs at 20mA each with tight regulation. |
| Switching Frequency | 1MHz - enables use of small 1µF ceramic flying capacitors and minimizes EMI in handheld RF systems. |
| Shutdown Current | <1µA - preserves battery life during display-off states in portable electronics. |
| Charge Pump Efficiency | 93% at VIN=3.6V, IOUT=120mA - exceeds doubler-based pumps by 33% lower input current under same load. |
| Soft-Start Time | 200µs - prevents inrush current spikes and reduces stress on input capacitors and battery. |
| Operating Temp | −40°C to +85°C - qualified for consumer and industrial portable equipment environments. |
Pinout & Package
Package: TSOPJW-12 (3.0mm × 2.4mm × 0.96mm, lead pitch 0.5mm, Pb-free, RoHS-compliant).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| C2+ | Flying capacitor 2 positive terminal | Connects to 1µF ceramic capacitor C2; forms half of 1.5X charge pump stage. |
| OUT | Charge pump regulated output | Delivers constant current to LED anodes; requires 1µF bypass capacitor to GND. |
| C1− | Flying capacitor 1 negative terminal | Completes C1 flying cap loop with C1+; essential for charge transfer in both 1X and 1.5X modes. |
| C1+ | Flying capacitor 1 positive terminal | Connects to 1µF ceramic capacitor C1; primary node for charge recycling in fractional conversion. |
| D (pins 5–8) | Current source output terminals | Four parallel outputs (each rated ≤120mA total) allow flexible multi-LED string routing or redundancy. |
| EN/SET | Serial control and enable input | Single-wire S2Cwire™ interface: rising edges set 32-level logarithmic current (3.3–120mA); low >500µs disables device. |
| IN | Main power input | Accepts 2.7–5.5V supply; requires 1µF ceramic bypass capacitor close to pin for stability. |
| GND | Power and signal reference ground | Common return path for input, output, and internal control circuits; must be low-impedance PCB plane. |
| C2− | Flying capacitor 2 negative terminal | Completes C2 flying cap loop; paired with C2+ to enable second-stage charge pumping. |
Key Features
| Feature | Design Value |
|---|---|
| Dual-mode 1X/1.5X conversion | Automatically selects most efficient operating mode (bypass or boost) based on real-time VIN/VOUT ratio - no firmware or external logic required. |
| S2Cwire™ serial interface | Single-pin, edge-triggered control eliminates need for I²C/SPI peripherals - reduces MCU GPIO count and simplifies layout. |
| No inductors required | Capacitor-only topology avoids magnetic EMI, size penalties, and inductor saturation risks - ideal for ultra-thin mobile PCBs. |
| Thermal protection | Shuts down current outputs if die temperature exceeds safe limit during short-circuit or overload - prevents permanent damage without external sensors. |
| Low-noise 1MHz operation | Fixed-frequency switching confines harmonics away from cellular bands (e.g., GSM, LTE), eliminating need for additional RF shielding. |
Applications
| Smartphone LCD Backlight | Tablet Display Backlight |
|---|---|
Use Scenario: Driving 4–6 white LEDs behind an IPS LCD panel in a battery-powered smartphone with dynamic brightness scaling. IC Role / Device Role / Timing Role: Constant-current source with automatic 1X/1.5X mode selection ensures minimal power draw across varying battery voltage (4.2V → 3.0V) and LED forward voltage (3.0–3.6V). Use Value: Extends usable battery life by 18% vs. fixed 2X charge pumps and eliminates audible coil whine due to inductor-free 1MHz operation. | Use Scenario: Powering dual-zone LED backlight in a 10-inch tablet with independent brightness control per zone. IC Role / Device Role / Timing Role: Dual-output current source (via D pins) provides matched drive to two LED strings; S2Cwire™ allows synchronized or staggered dimming via single MCU pin. Use Value: Reduces BOM count by 4 components per zone vs. discrete driver solutions and maintains ±3% current matching between zones over temperature. |
| Portable Medical Display | Industrial Handheld Terminal |
Use Scenario: Illuminating high-reliability monochrome LCD in a portable ultrasound device requiring flicker-free, EMC-compliant backlighting. IC Role / Device Role / Timing Role: Low-noise 1MHz charge pump supplies regulated current without radiating into sensitive analog front-end circuitry. Use Value: Meets CISPR-22 Class B conducted emissions limits without ferrite beads or shielded inductors - simplifying certification testing. | Use Scenario: Backlighting ruggedized OLED display in warehouse barcode scanner operating across −20°C to +70°C ambient. IC Role / Device Role / Timing Role: Wide-input (2.7–5.5V) operation accommodates alkaline, NiMH, or Li-ion power sources; thermal shutdown protects against prolonged button-press-induced overheating. Use Value: Enables single hardware revision across multiple battery chemistries and eliminates field failures due to thermal runaway during extended use. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AP3606B-W5-7 | Fixed 1.5X only (no 1X bypass mode); 800kHz switching; requires external resistor for current setting. | Lacks programmable dimming interface; suited for static-brightness applications only. | Choose when cost sensitivity outweighs flexibility and S2Cwire™ is unnecessary. |
| MAX1910EUT+T | 2X charge pump only; 1.2MHz; 3-wire SPI interface; higher quiescent current (12µA shutdown). | Higher output voltage headroom but less efficient below VOUT ≈ 1.5×VIN; no auto-mode switching. | Prefer when driving higher-VF LEDs (>4.0V) where 1.5X is insufficient and board space allows SPI routing. |
Compared with AP3606B-W5-7 and MAX1910EUT+T, the AAT3122ITP-T1 uniquely combines auto-selecting 1X/1.5X conversion, single-pin digital dimming, and sub-1µA shutdown - delivering superior energy efficiency and integration for dynamically controlled, battery-limited white LED systems.
Availability
AAT3122ITP-T1 is available at Aetrix Electronics and suitable for smartphone backlighting, tablet display modules, and portable medical instrumentation requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for AAT3122ITP-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 AAT3122ITP-T1 belongs to Skyworks' LED driver product line, engineered specifically for high-efficiency, low-EMI white LED backlighting in space-constrained portable electronics - emphasizing simplicity, reliability, and battery longevity.
FAQ
What is the maximum number of white LEDs the AAT3122ITP-T1 can drive simultaneously?
The AAT3122ITP-T1 provides a single regulated current source capable of delivering up to 120mA total output. As specified in the datasheet, it can drive up to six white LEDs at 20mA each. This assumes typical forward voltages of 3.0–3.6V and proper thermal management. The device does not support independent current control per LED - all LEDs share the same current source output (pins D1–D4), so string configuration must ensure matched VF characteristics or use ballast resistors.
Does the AAT3122ITP-T1 require external programming components for brightness control?
No, the AAT3122ITP-T1 uses Skyworks' proprietary S2Cwire™ interface on the EN/SET pin for brightness control - requiring only a single GPIO from the host MCU. Rising edges on EN/SET increment the 32-level logarithmic current setting (3.3mA to 120mA); no external resistors, DACs, or communication buses are needed. The interface wraps modulo-32, and holding EN/SET high maintains the selected level. This eliminates BOM overhead versus resistor-set or I²C-based alternatives.
Can the AAT3122ITP-T1 operate with input voltages below 2.7V?
No - the absolute minimum operating input voltage for the AAT3122ITP-T1 is 2.7V, as defined in the Absolute Maximum Ratings and Electrical Characteristics tables. Operation below this threshold may result in unstable regulation, failure to start, or undefined behavior. While the device tolerates transient undershoots down to −0.3V (per absolute max rating), sustained operation below 2.7V is outside specification and not characterized. For sub-2.7V battery systems, a pre-regulator or alternative driver must be used.
How does the AAT3122ITP-T1 manage thermal overload during LED short-circuit conditions?
The AAT3122ITP-T1 incorporates an integrated thermal protection circuit that monitors die temperature. If excessive heat builds up - such as during an output short-circuit or sustained overcurrent - the device automatically disables the charge pump and current outputs until the junction cools below the safe threshold. This shutdown is fully autonomous and requires no external circuitry. Recovery is automatic once thermal limits are restored, ensuring robustness in handheld devices subject to mechanical stress or accidental shorts.
What capacitor types and values are mandatory for stable operation of the AAT3122ITP-T1?
The AAT3122ITP-T1 requires four external ceramic capacitors: 1µF for CIN (input bypass), 1µF for COUT (output bypass), and two 1µF flying capacitors (C1 and C2). Skyworks explicitly recommends X7R or X5R dielectric ceramic capacitors with low ESR (<100mΩ) and non-polar construction. Tantalum or electrolytic capacitors are not supported due to higher ESR, polarity constraints, and poor transient response - using them risks instability, excessive ripple, or startup failure.
AAT3122ITP-T1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Skyworks Solutions Inc.
- Series:
- *
- Package/Case:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- -
- Topology:
- -
- Internal Switch(s):
- -
- Number of Outputs:
- -
- Voltage - Supply (Min):
- -
- Voltage - Supply (Max):
- -
- Voltage - Output:
- -
- Current - Output / Channel:
- -
- Frequency:
- -
- Dimming:
- -
- Applications:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
AAT3122ITP-T1 FAQ
1.How can I place an order for AAT3122ITP-T1 through Aetrix?
Please submit a Request for Quotation (RFQ) for AAT3122ITP-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 AAT3122ITP-T1 reliable?
The price and inventory of AAT3122ITP-T1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AAT3122ITP-T1 is usually 5 days.
3.What payment methods are accepted for AAT3122ITP-T1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AAT3122ITP-T1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AAT3122ITP-T1?
AAT3122ITP-T1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AAT3122ITP-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 AAT3122ITP-T1?
For technical support, including AAT3122ITP-T1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AAT3122ITP-T1 requirements.
6.How does Aetrix verify that AAT3122ITP-T1 is sourced from the original manufacturer or authorized distributors?
All AAT3122ITP-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 AAT3122ITP-T1 meets industry standards.
7.What is the process for return or replacement of AAT3122ITP-T1?
All AAT3122ITP-T1 units undergo pre-shipment inspection (PSI). If there is an issue with AAT3122ITP-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 AAT3122ITP-T1 part is unused and in its original packaging.
Return procedure for AAT3122ITP-T1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AAT3122ITP-T1 Tags
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