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Skyworks Solutions Inc. AAT2138IWO-0.6-T1
- Part No.:
- AAT2138IWO-0.6-T1
- Manufacturer:
- Skyworks Solutions Inc.
- Package:
- 14-WFDFN Exposed Pad
- Datasheet:
-
AAT2138IWO-0.6-T1.pdf
- Description:
- IC REG BUCK ADJ 3A 14TDFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,797
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Product details
Overview
AAT2138IWO-0.6-T1 from Skyworks Solutions is a high-current synchronous step-down converter with an integrated ±10% precision programmable current-limited P-channel load switch, operating from 2.7V–5.5V input and delivering up to 3A output current with 0.6V feedback reference. It features 2.8MHz fixed-frequency current-mode control, 100% duty-cycle dropout operation, and independent enable pins for the regulator (ENREG) and load switch (ENSYS), targeting USB-powered modem and portable storage applications.
For engineers reviewing the AAT2138IWO-0.6-T1 datasheet, AAT2138IWO-0.6-T1 pinout, AAT2138IWO-0.6-T1 application, or AAT2138IWO-0.6-T1 equivalent, key selection criteria include its dual-function architecture (buck + current-limited switch), RSET-programmable 0.5–3A load switch limit, 85mΩ/50mΩ internal FETs, 0.6V FB threshold, and TDFN33-14 package compatibility with compact 1μH inductor designs.
Technical Context
The AAT2138IWO-0.6-T1 integrates two independent power domains: a peak current-mode step-down regulator with internal slope compensation and a high-precision P-channel load switch controlled via RSET-to-ground resistor. Its 2.8MHz switching frequency enables use of tiny 1μH inductors, while 100% duty-cycle operation maintains regulation during input droop.
Control logic separates system-level protection (via ENSYS-gated load switch limiting input surge) from regulation (via ENREG-gated buck stage), with MODE pin supporting forced PWM, PFM/PWM auto-mode, or external 1–3MHz clock synchronization. The 0.6V FB reference is trimmed across temperature (±12mV over –40°C to +85°C) and supports adjustable outputs down to 3.0V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.7V to 5.5V - supports single-cell Li-ion, USB 2.0/3.0, and 3.3V/5V rail inputs without external LDO pre-regulation. |
| Feedback Reference Voltage | 0.600V ±12mV - enables precise output setting from 3.0V upward using standard resistor dividers; low drift ensures stable regulation across temperature. |
| Load Switch Current Limit | Programmable 0.5A–3.0A via RSET - ±10% accuracy protects upstream supplies (e.g., USB ports) from transient overloads in modem/data card applications. |
| Internal FETs | 85mΩ high-side P-MOSFET / 50mΩ low-side N-MOSFET - minimizes conduction loss at 2.5A output, enabling >95% peak efficiency with 1μH inductor. |
| Switching Frequency | 2.8MHz typical (2.4–2.8MHz range) - allows ultra-compact filter design; supports external 1–3MHz clock sync for EMI optimization. |
| Operating Temperature | –40°C to +85°C ambient - qualified for industrial and portable consumer environments; thermal shutdown at 150°C junction. |
| Package | TDFN33-14 (3mm × 3mm, 0.75mm height) - exposes pad for thermal relief; Pb-free, RoHS-compliant footprint compatible with standard reflow profiles. |
Pinout & Package
Packaged in a Pb-free, low-profile 14-pin TDFN (TDFN33-14) measuring 3mm × 3mm × 0.75mm, the AAT2138IWO-0.6-T1 uses an exposed thermal pad (EP/GND) connected directly to PCB ground plane for optimal thermal performance (ΘJA = 60°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2 PGND | Power Ground | Internally tied to low-side MOSFET source; must be low-impedance connection to system ground plane for current return and thermal dissipation. |
| 3, 4 REGIN | Regulator Input Supply | Input to buck stage and load switch output node; bypass with ≥4.7μF ceramic capacitor to PGND to stabilize switching transients. |
| 5 ENREG | Regulator Enable (Active High) | Logic-high enables buck converter; logic-low forces shutdown (<1μA quiescent current); must not float. |
| 6 RSET | Current-Limit Programming | Connect resistor to AGND to set load switch current limit (0.5–3A); value determines threshold with ±10% tolerance. |
| 7 AGND | Analog Ground | Reference ground for FB, RSET, and internal error amplifier; separate from PGND to minimize noise coupling into regulation loop. |
| 8 ENSYS | Load Switch Enable (Active Low) | Logic-low enables P-channel load switch; logic-high disables it and discharges REGIN via internal 8Ω MOSFET. |
| 9 FB | Feedback Input | Senses output voltage via resistive divider; regulated to 0.6V; leakage <50nA ensures minimal divider current error. |
| 10 MODE | Operating Mode Control | Pull high for forced PWM; pull low for PFM/PWM auto-mode; accept 1–3MHz external clock to override internal oscillator. |
| 11, 12 SYSIN | System Input Supply | Primary input for load switch and bias for control circuitry; powers analog/switching blocks; connects to USB or battery source. |
| 13, 14 SW | Switch Node | Connection point between high-side P-MOSFET drain and low-side N-MOSFET source; drives external 1μH inductor. |
| EP | Exposed Pad (GND) | Thermal and electrical ground connection; must be soldered to large copper area for heat dissipation and noise reduction. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Load Switch + Buck Regulator | Single-chip solution replaces discrete switch + DC/DC, reducing BOM count and board area while ensuring coordinated startup/shutdown sequencing. |
| Programmable ±10% Current Limit | RSET-based adjustment enables precise USB port compliance (e.g., 900mA for USB 2.0, 1.5A for USB 3.0) without trimming or calibration. |
| 100% Duty-Cycle Dropout Operation | Maintains output regulation when input drops near VOUT, critical for battery-powered devices operating through discharge curves. |
| No External Compensation Required | Internally compensated current-mode architecture eliminates need for external compensation network, simplifying layout and validation. |
| Independent Enable Pins | Separate ENREG and ENSYS allow granular power sequencing-e.g., enable load switch first to charge REGIN, then enable buck after soft-start. |
| REGIN Discharge Function | Automatic 8Ω discharge path activates when SYSIN falls below 3.0V, rapidly clearing stored energy and preventing brownout glitches on downstream rails. |
Applications
| Wireless Modem Data Cards | Portable Hard Drives |
|---|---|
|
Use Scenario: High-data-rate 3G/4G modems drawing bursty 2–3A loads from USB ports during transmission. IC Role / Device Role / Timing Role: AAT2138IWO-0.6-T1 acts as both input current limiter (protecting host USB port) and efficient 3.3V/3.8V supply for baseband processor and RF front-end. Use Value: Prevents host port shutdown during transient surges while maintaining >93% efficiency at 2A, extending runtime versus linear solutions. |
Use Scenario: 2.5-inch portable HDD requiring clean, regulated 3.3V rail from 5V USB input with inrush current control. IC Role / Device Role / Timing Role: AAT2138IWO-0.6-T1 provides soft-started 3.3V output and limits inrush to <500mA during spin-up, avoiding USB enumeration failure. Use Value: Eliminates need for separate inrush limiter IC; 1ms soft-start time prevents mechanical stress on drive motor and controller. |
| Barcode Scanners | Credit Card Readers |
|
Use Scenario: Handheld scanners powered by USB or battery, requiring fast wake-up and stable 3.3V for laser diode driver and image sensor. IC Role / Device Role / Timing Role: AAT2138IWO-0.6-T1 delivers regulated 3.3V with <100mV load transient deviation and enables rapid power-on via independent ENREG/ENSYS control. Use Value: 2.8MHz switching minimizes output capacitor size (22μF ceramic sufficient), reducing form factor for handheld ergonomics. |
Use Scenario: Contactless/NFC credit card readers drawing intermittent 1.5A peaks during RF transmission from 5V USB bus. IC Role / Device Role / Timing Role: AAT2138IWO-0.6-T1 serves as protected 3.3V supply with programmable 1.5A current limit, preventing USB port overcurrent faults. Use Value: ±10% current limit accuracy ensures consistent compliance with USB BC1.2 and CDP specifications across temperature and unit variance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator + current-limited load switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS62130ARGTR | Single-output buck only (no integrated load switch); 3A max output; 2.5V–6V input; 0.6V FB; requires external current-limiting circuitry. | Lacks native USB port protection; suitable where load switch functionality is implemented separately or unnecessary. | Select if only regulated output is needed and system already includes discrete current limiting or hot-swap controller. |
| RT8070ZSP | Buck + integrated load switch; 2A max switch current; 2.5V–5.5V input; 0.6V FB; 1.5MHz switching; no external clock sync support. | Lower current capability and fixed frequency limit flexibility; lacks REGIN discharge function and 100% dropout mode. | Choose for cost-sensitive designs with ≤2A load switch requirement and no need for external clock synchronization or deep dropout operation. |
Compared with TPS62130ARGTR and RT8070ZSP, the AAT2138IWO-0.6-T1 uniquely combines 3A programmable load switch protection, 2.8MHz variable-frequency operation, and 100% duty-cycle dropout in a single TDFN package-enabling smaller total solution size and tighter USB compliance for portable data interfaces.
Availability
AAT2138IWO-0.6-T1 is available at Aetrix Electronics and suitable for wireless modem data cards, portable hard drives, and USB-powered barcode scanners requiring stable component supply with guaranteed long-term availability and full traceability.
Supply support for AAT2138IWO-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 leader in high-performance analog semiconductors, specializing in RF, power management, and timing solutions for mobile, infrastructure, and automotive markets.
The AAT2138IWO-0.6-T1 belongs to Skyworks' AAT family of highly integrated power management ICs designed specifically for USB-powered portable electronics requiring robust input protection and compact, efficient DC/DC conversion.
FAQ
What is the purpose of the RSET pin on the AAT2138IWO-0.6-T1?
The RSET pin on the AAT2138IWO-0.6-T1 sets the current limit threshold for the integrated P-channel load switch by connecting an external resistor to AGND. With values from 1.3kΩ to 13.3kΩ, it programs the limit from 3A down to 0.4A. The AAT2138IWO-0.6-T1 achieves ±10% accuracy across temperature and input voltage variations, making it ideal for USB port current compliance.
How does the AAT2138IWO-0.6-T1 handle input voltage dropout conditions?
The AAT2138IWO-0.6-T1 supports 100% duty-cycle operation, allowing the output voltage to track the input minus the RDS(ON) drop of the high-side P-MOSFET when VIN approaches VOUT. This dropout mode maintains regulation during battery discharge or USB cable voltage drop, and the AAT2138IWO-0.6-T1 sustains this behavior without external components or configuration changes.
Can the AAT2138IWO-0.6-T1 be synchronized to an external clock?
Yes-the MODE pin of the AAT2138IWO-0.6-T1 accepts an external 1MHz–3MHz clock signal to override the internal 2.8MHz oscillator. This feature enables EMI reduction through frequency dithering or alignment with system clocks, and the AAT2138IWO-0.6-T1 maintains full regulation and protection functionality during external sync operation.
What is the function of the REGIN pin on the AAT2138IWO-0.6-T1?
The REGIN pin on the AAT2138IWO-0.6-T1 serves dual roles: it is the input supply for the step-down regulator and the output node of the integrated load switch. It must be bypassed with ≥4.7μF ceramic capacitance to PGND. During ENSYS deactivation, the AAT2138IWO-0.6-T1 actively discharges REGIN via an internal 8Ω MOSFET to prevent residual voltage holdup.
Does the AAT2138IWO-0.6-T1 require external compensation components?
No-the AAT2138IWO-0.6-T1 uses internally compensated peak current-mode control, eliminating the need for external compensation networks. Its design includes fixed slope compensation optimized for stability across all duty cycles, including >50%, and the AAT2138IWO-0.6-T1 achieves excellent transient response with only a 1μH inductor and standard output capacitors.
AAT2138IWO-0.6-T1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Skyworks Solutions Inc.
- Series:
- -
- Package/Case:
- 14-WFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2.7V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 3V
- Voltage - Output (Max):
- 5.5V
- Current - Output:
- 3A
- Frequency - Switching:
- 2.8MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-TDFN (3x3)
AAT2138IWO-0.6-T1 FAQ
1.How can I place an order for AAT2138IWO-0.6-T1 through Aetrix?
Please submit a Request for Quotation (RFQ) for AAT2138IWO-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 AAT2138IWO-0.6-T1 reliable?
The price and inventory of AAT2138IWO-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 AAT2138IWO-0.6-T1 is usually 5 days.
3.What payment methods are accepted for AAT2138IWO-0.6-T1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AAT2138IWO-0.6-T1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AAT2138IWO-0.6-T1?
AAT2138IWO-0.6-T1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AAT2138IWO-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 AAT2138IWO-0.6-T1?
For technical support, including AAT2138IWO-0.6-T1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AAT2138IWO-0.6-T1 requirements.
6.How does Aetrix verify that AAT2138IWO-0.6-T1 is sourced from the original manufacturer or authorized distributors?
All AAT2138IWO-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 AAT2138IWO-0.6-T1 meets industry standards.
7.What is the process for return or replacement of AAT2138IWO-0.6-T1?
All AAT2138IWO-0.6-T1 units undergo pre-shipment inspection (PSI). If there is an issue with AAT2138IWO-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 AAT2138IWO-0.6-T1 part is unused and in its original packaging.
Return procedure for AAT2138IWO-0.6-T1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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