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Skyworks Solutions Inc. AAT3218IJS-1.2-T1
- Part No.:
- AAT3218IJS-1.2-T1
- Manufacturer:
- Skyworks Solutions Inc.
- Package:
- -
- Datasheet:
-
AAT3218IJS-1.2-T1.pdf
- Description:
- IC REG LINEAR 1.2V 150MA 8SC70JW
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Product details
Overview
AAT3218IJS-1.2-T1 from Skyworks Solutions is a 150mA, 1.2V fixed-output Micropower low-dropout linear regulator in SC70JW-8 package, featuring 200mV dropout at full load, ±1.5% output voltage accuracy, and 70µA quiescent current - optimized for battery-powered portable electronics requiring fast transient response and low-noise power delivery, such as Bluetooth headsets and digital cameras.
For engineers reviewing the AAT3218IJS-1.2-T1 datasheet, AAT3218IJS-1.2-T1 pinout, AAT3218IJS-1.2-T1 application, or AAT3218IJS-1.2-T1 equivalent, key selection considerations include guaranteed 150mA output capability, factory-programmed 1.2V output, SC70JW-8 thermal performance (190°C/W), enable-controlled shutdown (<1µA), and bypass-capacitor-enhanced PSRR (67dB @ 1kHz).
Technical Context
The AAT3218IJS-1.2-T1 implements a proprietary CMOS-based LDO architecture with active error amplifier feedback control and fast-start circuitry to achieve sub-15µs enable delay and rapid load transient recovery (<30mV deviation). Its internal PMOS pass transistor enables low dropout and high PSRR without external compensation.
It integrates over-temperature shutdown (145°C trip, 12°C hysteresis) and short-circuit protection (600mA limit), with an active output pull-down during shutdown via internal 1.5kΩ resistor. The BYP pin supports optional 10nF ceramic capacitor to reduce output noise (50µVrms) and improve ripple rejection across 1kHz–1MHz.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.2V ±1.5% (25°C), ±2.5% (−40°C to +85°C) - ensures stable core logic or low-voltage sensor biasing without external feedback. |
| Max Output Current | 150mA continuous - sufficient for powering baseband processors, RF front-ends, or multi-sensor subsystems in portable devices. |
| Dropout Voltage | 200mV typical at 150mA - allows operation from 1.4V input (e.g., single Li-ion cell at end-of-discharge) while maintaining regulation. |
| Quiescent Current | 70µA typical - extends battery life in always-on standby modes (e.g., Bluetooth LE listening state). |
| PSRR | 67dB @ 1kHz, 47dB @ 10kHz - suppresses switching noise from DC/DC converters feeding the LDO input. |
| Output Noise | 50µVrms (300Hz–50kHz) - suitable for noise-sensitive analog circuits like ADC references or audio codecs. |
| Enable Threshold | VEN(H) = 1.5V, VEN(L) = 0.6V - compatible with standard 1.8V/3.3V GPIOs and supports direct tie-to-VIN for always-on operation. |
Pinout & Package
Package: SC70JW-8 (2.0mm × 2.1mm, 0.5mm pitch), Pb-free, moisture sensitivity level 1 - enables ultra-compact PCB layouts in space-constrained portable designs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN (Pin 1, 2, 3) | Input voltage supply | Accepts 1.4V–5.5V input; requires ≥1µF ceramic decoupling close to pin to stabilize line transients. |
| GND (Pin 4) | Ground reference | Common return path for IN, OUT, BYP, and EN; must connect directly to low-impedance ground plane. |
| EN (Pin 5) | Active-high enable control | Pulling below 0.6V disables regulator and reduces current to <1µA; no pull-up required if tied to VIN. |
| BYP (Pin 6) | Reference bypass node | Connects 10nF NPO/C0G capacitor to GND to reduce output noise and boost PSRR - omission increases turn-on speed but degrades AC performance. |
| OUT (Pin 7, 8) | Regulated output | Delivers 1.2V ±1.5%; requires ≥2.2µF ceramic capacitor (X7R/X5R) directly between OUT and GND for stability and transient response. |
Key Features
| Feature | Design Value |
|---|---|
| Fast transient response | Load step recovery within microseconds (≤30mV deviation for 1mA→150mA) - maintains clean supply during burst-mode processor activity. |
| Low-noise bypass architecture | 50µVrms output noise with 10nF BYP capacitor - eliminates need for post-LDO RC filtering in precision analog signal chains. |
| Thermal + short-circuit protection | 145°C shutdown with 12°C hysteresis and 600mA current limiting - enables robust operation under fault conditions without external circuitry. |
| CMOS-compatible enable | 1.5V logic-high threshold and <1µA shutdown current - simplifies integration with low-voltage microcontrollers and PMIC sequencers. |
| Ceramic capacitor optimization | Stable with 2.2µF X7R ceramic output cap (no ESR requirement) - reduces BOM cost and board area vs. tantalum alternatives. |
Applications
| Bluetooth Headset Power Management | Digital Camera Sensor Bias |
|---|---|
Use Scenario: Powers Bluetooth baseband IC and RF transceiver in compact headset form factor with single-cell Li-ion battery (2.8–4.2V). IC Role / Device Role / Timing Role: Primary 1.2V core supply regulator with enable-controlled sleep/wake sequencing synchronized to host MCU commands. Use Value: 70µA quiescent current extends standby time >100 hours; 200mV dropout enables full 150mA operation down to 1.4V input - critical for end-of-battery-life runtime. | Use Scenario: Supplies image sensor analog front-end and ISP core logic in low-power digital camera modules. IC Role / Device Role / Timing Role: Low-noise 1.2V bias rail decoupled from noisy digital supplies; BYP pin used with 10nF cap to meet <100µVrms noise spec. Use Value: 50µVrms output noise and 67dB PSRR prevent switching artifacts from corrupting 12-bit sensor data - eliminates need for additional LDO stages. |
| Notebook Computer Subsystem Rail | Portable Medical Sensor Node |
Use Scenario: Provides dedicated 1.2V supply for embedded security coprocessor or touch controller in ultrabook platform. IC Role / Device Role / Timing Role: Always-on auxiliary LDO with EN tied to system PMIC rail; fast turn-on (<15µs) meets instant-resume timing requirements. Use Value: Sub-15µs enable delay and <30mV load transient deviation ensure coprocessor clock domain stabilizes before firmware execution begins - avoids boot failures. | Use Scenario: Powers wearable ECG/PPG analog signal chain and low-power MCU in FDA-cleared patient monitor patch. IC Role / Device Role / Timing Role: Primary regulated supply for precision analog front-end; shutdown mode activated during wireless transmission gaps. Use Value: <1µA shutdown current and ±1.5% accuracy over −40°C to +85°C ensure clinical-grade measurement repeatability and multi-day battery life on coin cell. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MCP1700T-1202E/TT | 150mA, 1.2V, SOT23-5, 6µA IQ, 350mV dropout @ 150mA | Lower quiescent current but higher dropout limits minimum input to ≥1.55V | Prefer when ultra-low IQ dominates over input voltage headroom constraints. |
| Torex XC6206P122MR-G | 150mA, 1.2V, SOT23-5, 1.0µA IQ, 300mV dropout @ 150mA, no enable pin | No enable function; lower IQ but slower transient response and no BYP pin for noise reduction | Prefer for always-on, cost-sensitive applications where enable control and low noise are not required. |
Compared with MCP1700T-1202E/TT and XC6206P122MR-G, the AAT3218IJS-1.2-T1 uniquely balances ultra-low noise (50µVrms), fast transient response, and integrated enable/BYP functionality in a thermally efficient SC70JW-8 package - making it optimal for noise-sensitive, battery-constrained portable systems requiring dynamic power management.
Availability
AAT3218IJS-1.2-T1 is available at Aetrix Electronics and suitable for Bluetooth headsets, digital cameras, and portable medical sensors requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.
Supply support for AAT3218IJS-1.2-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 mobile, automotive, and infrastructure markets.
The AAT3218 product line delivers Micropower LDO regulators engineered for portable electronics demanding ultra-low IQ, fast transient response, and small-footprint packaging - targeting battery-powered applications where efficiency, size, and noise performance are critical.
FAQ
What is the maximum input voltage rating for the AAT3218IJS-1.2-T1?
The AAT3218IJS-1.2-T1 has an absolute maximum input voltage of 6V. However, for reliable continuous operation at 150mA output and ambient temperature of 25°C, the recommended maximum input is 5.5V. At 85°C ambient, the safe input voltage drops to ~3.7V for 150mA load due to thermal limits - refer to the thermal derating equations in the datasheet for precise boundary calculation.
Does the AAT3218IJS-1.2-T1 require an external bypass capacitor on the BYP pin?
The AAT3218IJS-1.2-T1 does not require an external bypass capacitor on the BYP pin for basic operation, but adding a 10nF NPO/C0G ceramic capacitor between BYP and GND is strongly recommended to achieve specified 50µVrms output noise and 67dB PSRR at 1kHz. Omitting it increases output noise and reduces ripple rejection, though it slightly improves turn-on speed.
Can the AAT3218IJS-1.2-T1 be used with ceramic output capacitors smaller than 2.2µF?
Yes - for loads under 10mA, the AAT3218IJS-1.2-T1 remains stable with as little as 0.47µF ceramic output capacitance. However, the datasheet specifies 2.2µF as the minimum for full 150mA operation and optimal transient response. Using smaller values may cause excessive output voltage deviation during load steps or reduced PSRR.
What is the thermal resistance (θJA) of the AAT3218IJS-1.2-T1 in its SC70JW-8 package?
The AAT3218IJS-1.2-T1 in SC70JW-8 package has a maximum junction-to-ambient thermal resistance (θJA) of 190°C/W when mounted on a standard demo board per JEDEC standards. This value assumes minimal copper pour; actual θJA improves significantly with increased PCB copper area connected to the GND pad.
How does the enable function behave during shutdown of the AAT3218IJS-1.2-T1?
When the EN pin voltage falls below 0.6V, the AAT3218IJS-1.2-T1 enters shutdown mode, reducing ground current to <1µA. An internal 1.5kΩ resistor connects OUT to GND to actively discharge the output capacitor - ensuring rapid voltage decay and preventing backfeed into downstream circuitry during power-down sequences.
AAT3218IJS-1.2-T1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Skyworks Solutions Inc.
- Series:
- *
- Package/Case:
- -
- Packaging:
- Cut Tape (CT)
- Product Status:
- Obsolete
- Output Configuration:
- -
- Output Type:
- -
- Number of Regulators:
- -
- Voltage - Input (Max):
- -
- Voltage - Output (Min/Fixed):
- -
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- -
- Current - Output:
- -
- Current - Quiescent (Iq):
- -
- Current - Supply (Max):
- -
- PSRR:
- -
- Control Features:
- -
- Protection Features:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
AAT3218IJS-1.2-T1 FAQ
1.How can I place an order for AAT3218IJS-1.2-T1 through Aetrix?
Please submit a Request for Quotation (RFQ) for AAT3218IJS-1.2-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 AAT3218IJS-1.2-T1 reliable?
The price and inventory of AAT3218IJS-1.2-T1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AAT3218IJS-1.2-T1 is usually 5 days.
3.What payment methods are accepted for AAT3218IJS-1.2-T1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AAT3218IJS-1.2-T1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AAT3218IJS-1.2-T1?
AAT3218IJS-1.2-T1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AAT3218IJS-1.2-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 AAT3218IJS-1.2-T1?
For technical support, including AAT3218IJS-1.2-T1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AAT3218IJS-1.2-T1 requirements.
6.How does Aetrix verify that AAT3218IJS-1.2-T1 is sourced from the original manufacturer or authorized distributors?
All AAT3218IJS-1.2-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 AAT3218IJS-1.2-T1 meets industry standards.
7.What is the process for return or replacement of AAT3218IJS-1.2-T1?
All AAT3218IJS-1.2-T1 units undergo pre-shipment inspection (PSI). If there is an issue with AAT3218IJS-1.2-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 AAT3218IJS-1.2-T1 part is unused and in its original packaging.
Return procedure for AAT3218IJS-1.2-T1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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