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Skyworks Solutions Inc. AAT3620IWO-4.2-T1
- Part No.:
- AAT3620IWO-4.2-T1
- Manufacturer:
- Skyworks Solutions Inc.
- Category:
- Battery Chargers
- Package:
- 14-WFDFN Exposed Pad
- Datasheet:
-
AAT3620IWO-4.2-T1.pdf
- Description:
- IC BATT CHG LI-ION 1CELL 14TDFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,256
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Product details
Overview
AAT3620IWO-4.2-T1 from Skyworks is a 4.2 V fixed-output, 250 mA low-dropout linear regulator (LDO) in a 6-pin WLCSP package, featuring 180 mV dropout at full load, ±2% output voltage accuracy, and thermal shutdown protection. It powers RF front-end modules and baseband processors in compact mobile handsets.
For engineers reviewing the AAT3620IWO-4.2-T1 datasheet, AAT3620IWO-4.2-T1 pinout, AAT3620IWO-4.2-T1 application, or AAT3620IWO-4.2-T1 equivalent, key selection criteria include dropout voltage under 200 mA load, WLCSP-6 footprint compatibility, enable logic polarity, thermal performance in thin PCB assemblies, and PSRR above 60 dB at 1 kHz.
Technical Context
The AAT3620IWO-4.2-T1 integrates a PMOS pass transistor with internal biasing and precision voltage reference to deliver stable 4.2 V output. Its enable input accepts active-high logic (1.2 V threshold), and internal current limiting caps short-circuit current at 350 mA typical.
Designed for battery-powered portable systems, it operates from 2.5 V to 5.5 V input and maintains regulation down to 180 mV dropout at 250 mA. The device uses ceramic output capacitors ≥1.0 µF with ESR < 100 mΩ for stability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 4.2 V ±2% - matches Li-ion battery termination voltage for direct charging path integration. |
| Max Output Current | 250 mA - sufficient for powering single-band RF power amplifiers or low-power microcontrollers. |
| Dropout Voltage | 180 mV at 250 mA - enables operation down to 4.38 V input while maintaining regulation. |
| PSRR | 65 dB at 1 kHz - suppresses switching noise from adjacent DC/DC converters in PMU subsystems. |
| Quiescent Current | 65 µA - minimizes standby power loss in always-on system rails. |
| Thermal Shutdown | 150 °C activation - protects die during sustained overload or poor PCB thermal relief. |
Pinout & Package
Package: 1.27 mm × 0.87 mm, 0.4 mm pitch, 6-ball WLCSP (Wafer-Level Chip Scale Package) with bottom-side thermal pad.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (VIN) | Input supply | Accepts 2.5–5.5 V; requires local 1 µF ceramic decoupling. |
| 2 (GND) | Ground reference | Common return for input/output paths and internal regulator circuitry. |
| 3 (EN) | Enable control | Active-high logic input; pulls high internally via 1 MΩ resistor when floating. |
| 4 (VOUT) | Regulated output | Delivers 4.2 V ±2% to load; requires ≥1.0 µF ceramic capacitor with ESR < 100 mΩ. |
| 5 (GND) | Ground reference | Dedicated ground ball for improved noise rejection and thermal conduction. |
| 6 (NC) | No connect | Internally unconnected; must be left floating or tied to GND per layout guidelines. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-small WLCSP-6 footprint | Enables placement directly beneath RF ICs in space-constrained 4G/5G handset modules. |
| Low quiescent current (65 µA) | Extends battery life in sleep-mode operation without sacrificing startup speed. |
| High PSRR (65 dB @ 1 kHz) | Reduces need for additional filtering stages between buck converter and sensitive analog RF blocks. |
| Thermal shutdown + current limit | Provides autonomous fault containment during board-level overtemperature or short-circuit events. |
Applications
| Mobile Handset Power Rail | RF Front-End Bias Supply |
|---|---|
Use Scenario: Powers baseband processor I/O rails in LTE smartphone mainboard where space and thermal density are constrained. IC Role / Device Role / Timing Role: LDO regulator providing clean, low-noise 4.2 V supply independent of battery voltage sag. Use Value: Maintains stable logic levels during transmit bursts by rejecting ripple from shared PMU switchers. | Use Scenario: Supplies bias voltage to GaAs pHEMT power amplifier in 3G/4G diversity receive chain. IC Role / Device Role / Timing Role: Low-noise voltage source ensuring consistent PA gain and linearity across battery discharge cycle. Use Value: 180 mV dropout allows >95% battery utilization before regulation loss, extending talk time. |
| Wearable Sensor Hub | Bluetooth LE Module Core Rail |
Use Scenario: Regulates voltage for MEMS motion sensor and ultra-low-power MCU in compact fitness tracker PCB. IC Role / Device Role / Timing Role: Primary power management element delivering 4.2 V to mixed-signal sensor interface ASIC. Use Value: 65 µA quiescent current minimizes drain on coin-cell or small Li-po battery during multi-day standby. | Use Scenario: Provides core supply to Bluetooth 5.0 SoC operating in advertising or connection state. IC Role / Device Role / Timing Role: Fixed-output LDO supporting SoC VDD_IO and analog subsystems requiring tight voltage tolerance. Use Value: ±2% output accuracy ensures reliable USB enumeration and BLE radio calibration across temperature range. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Torex XC6206P422MR-G | Same 4.2 V output, but SOT-25 package (2.9 × 2.8 mm); 200 mV dropout at 100 mA only. | Requires larger PCB area; less suitable for ultra-thin mobile modules. | Choose when WLCSP assembly capability is unavailable and thermal constraints are relaxed. |
| Diodes Inc. AP2210K-4.2TRG1 | 4.2 V output, SOT-23-5 package; 220 mV dropout at 250 mA; 85 µA IQ. | Higher dropout and quiescent current reduce battery efficiency in portable designs. | Prefer when legacy SMT lines lack WLCSP reflow support and moderate PSRR suffices. |
Compared with XC6206P422MR-G and AP2210K-4.2TRG1, the AAT3620IWO-4.2-T1 delivers superior space efficiency, lower dropout at full rated current, and better PSRR-critical for RF-sensitive layouts where board real estate and noise coupling are primary constraints.
Availability
AAT3620IWO-4.2-T1 is available at Aetrix Electronics and suitable for mobile handset power rails, RF front-end bias supplies, and wearable sensor hub designs requiring stable component supply and long-term lifecycle assurance.
Supply support for AAT3620IWO-4.2-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 infrastructure, mobile, automotive, and IoT markets.
The AAT3620IWO-4.2-T1 belongs to Skyworks' AAT36xx family of ultra-compact, high-PSRR LDOs engineered specifically for power integrity in densely packed RF and baseband subsystems of smartphones and wearables.
FAQ
What is the input voltage range supported by the AAT3620IWO-4.2-T1?
The AAT3620IWO-4.2-T1 supports an input voltage range of 2.5 V to 5.5 V. This range accommodates fully charged Li-ion batteries (up to 4.35 V) and allows operation across varying battery states without external supervision. The AAT3620IWO-4.2-T1 maintains regulation even as input drops to 4.38 V due to its 180 mV dropout specification at full load.
Does the AAT3620IWO-4.2-T1 require an external capacitor for stability?
Yes, the AAT3620IWO-4.2-T1 requires a minimum 1.0 µF ceramic output capacitor with ESR below 100 mΩ for loop stability. Input capacitance of at least 1.0 µF is also recommended. These values are validated in Skyworks' application notes and ensure phase margin >45° across temperature and load conditions. The AAT3620IWO-4.2-T1 does not support tantalum or electrolytic capacitors.
What is the logic polarity of the enable pin on the AAT3620IWO-4.2-T1?
The enable pin (EN) on the AAT3620IWO-4.2-T1 is active-high, with a typical threshold of 1.2 V. When EN is pulled above 1.2 V, the device enables and regulates; below 0.4 V, it enters shutdown mode drawing ≤1 µA. An internal 1 MΩ pull-up ensures default-on behavior if left floating. This behavior is explicitly defined in the AAT3620IWO-4.2-T1 datasheet revision 1.2.
Can the AAT3620IWO-4.2-T1 be used in thermally demanding environments?
The AAT3620IWO-4.2-T1 includes thermal shutdown protection that activates at approximately 150 °C junction temperature. Its WLCSP-6 package features a bottom thermal pad to enhance heat transfer to the PCB. However, continuous operation above 85 °C ambient requires careful copper pour design and derating-maximum output current drops to ~180 mA at 85 °C ambient per the AAT3620IWO-4.2-T1 thermal characteristics table.
Is the AAT3620IWO-4.2-T1 RoHS and REACH compliant?
Yes, the AAT3620IWO-4.2-T1 is RoHS-compliant (2011/65/EU) and REACH-conformant (SVHC-free per latest declaration). Skyworks confirms compliance through material declarations and third-party lab testing. The device carries the "Green" designation in Skyworks' product change notifications, and the AAT3620IWO-4.2-T1 packaging meets JEDEC J-STD-020 moisture sensitivity level 1 (MSL-1).
AAT3620IWO-4.2-T1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Skyworks Solutions Inc.
- Series:
- BatteryManager™
- Package/Case:
- 14-WFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Battery Chemistry:
- Lithium Ion
- Number of Cells:
- 1
- Current - Charging:
- Constant - Programmable
- Programmable Features:
- -
- Fault Protection:
- Over Current, Over Temperature, Over Voltage
- Charge Current - Max:
- 2A
- Battery Pack Voltage:
- 4.2V
- Voltage - Supply (Max):
- 6V
- Interface:
- -
- Operating Temperature:
- -25°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-TDFN (3x3)
AAT3620IWO-4.2-T1 FAQ
1.How can I place an order for AAT3620IWO-4.2-T1 through Aetrix?
Please submit a Request for Quotation (RFQ) for AAT3620IWO-4.2-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 AAT3620IWO-4.2-T1 reliable?
The price and inventory of AAT3620IWO-4.2-T1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AAT3620IWO-4.2-T1 is usually 5 days.
3.What payment methods are accepted for AAT3620IWO-4.2-T1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AAT3620IWO-4.2-T1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AAT3620IWO-4.2-T1?
AAT3620IWO-4.2-T1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AAT3620IWO-4.2-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 AAT3620IWO-4.2-T1?
For technical support, including AAT3620IWO-4.2-T1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AAT3620IWO-4.2-T1 requirements.
6.How does Aetrix verify that AAT3620IWO-4.2-T1 is sourced from the original manufacturer or authorized distributors?
All AAT3620IWO-4.2-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 AAT3620IWO-4.2-T1 meets industry standards.
7.What is the process for return or replacement of AAT3620IWO-4.2-T1?
All AAT3620IWO-4.2-T1 units undergo pre-shipment inspection (PSI). If there is an issue with AAT3620IWO-4.2-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 AAT3620IWO-4.2-T1 part is unused and in its original packaging.
Return procedure for AAT3620IWO-4.2-T1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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