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Diodes Incorporated AP2122AK-3.0TRG1
- Part No.:
- AP2122AK-3.0TRG1
- Manufacturer:
- Diodes Incorporated
- Package:
- SC-74A, SOT-753
- Datasheet:
-
AP2122AK-3.0TRG1.pdf
- Description:
- IC REG LINEAR 3V 150MA SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:3,873
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Product details
Overview
AP2122AK-3.0TRG1 from Diodes Incorporated is a fixed-output 3.0V, high-speed, ultra-low-noise LDO regulator in SOT-23-5 package, delivering ≥150mA output current with 150mV typical dropout at 100mA, 30µVrms output noise (10Hz–100kHz), and ±2% output voltage accuracy over -40°C to +85°C. It serves as a precision local power rail for noise-sensitive analog and RF circuitry in portable battery-powered systems.
For engineers reviewing the AP2122AK-3.0TRG1 datasheet, AP2122AK-3.0TRG1 pinout, AP2122AK-3.0TRG1 application, or AP2122AK-3.0TRG1 equivalent, key selection criteria include low-noise performance, CMOS-based enable control with internal 5MΩ pull-down, compatibility with 1µF ceramic output capacitors, and thermal performance in compact SOT-23-5 footprint.
Technical Context
The AP2122AK-3.0TRG1 integrates a CMOS error amplifier, precision voltage reference, resistor network for fixed 3.0V output, current-limit protection, and active-high chip enable with built-in 5MΩ pull-down resistor. Its architecture enables fast line and load transient response without external compensation.
It operates across 2V to 6V input range, maintains regulation down to 3.0V + 150mV input, and achieves 70dB PSRR at 10kHz while consuming only 25µA quiescent current - enabling stable low-noise biasing for ADCs, PLLs, and RF front-ends in space-constrained designs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 3.0V ±2% - ensures stable supply for 3.0V logic and analog ICs without external feedback tuning |
| Max Output Current | 150mA continuous - supports moderate-power microcontrollers, sensors, and interface ICs |
| Dropout Voltage | 150mV typ. @ 100mA - enables operation from single-cell Li-ion (3.0–4.2V) or 3.3V rails with margin |
| Output Noise | 30µVrms (10Hz–100kHz) - minimizes phase jitter in clocked circuits and quantization noise in precision ADCs |
| PSRR | 70dB typ. @ 10kHz - suppresses switching noise from upstream DC/DC converters feeding the LDO input |
| Quiescent Current | 25µA typ. - extends battery life in always-on sensor nodes and standby modes |
| Enable Threshold | VCE(HI) = 1.5V min., VCE(LO) = 0.25V max. - compatible with 1.8V/3.3V GPIO without level-shifting |
| Thermal Resistance | θJA = 250°C/W - defines power dissipation limit of ~240mW at 85°C ambient in standard PCB layout |
Pinout & Package
SOT-23-5 package: 2.9mm × 1.6mm × 1.1mm body, gull-wing leads, 0.95mm pitch, JEDEC MO-178AC compliant. Requires standard SOT-23-5 PCB pad layout per Diodes datasheet DS41210 Rev. 3, page 16.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - VOUT | Regulated output voltage node | Connects directly to load; requires ≥1µF ceramic capacitor to ground for stability and noise filtering |
| 2 - GND | Analog and power ground reference | Must be low-impedance connection to system ground plane; shared with input capacitor return |
| 3 - VIN | Unregulated input supply input | Accepts 2V–6V; requires ≥1µF ceramic capacitor to ground within 5mm of pin for EMI suppression |
| 4 - NC | No connection | Internally unconnected; must remain floating - no trace or copper pour attached |
| 5 - CE | Active-high enable control input | Pulled internally to GND via 5MΩ resistor; driven high (>1.5V) to enable, low (<0.25V) to shut down output |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low output noise | 30µVrms (10Hz–100kHz) - preserves SNR in audio codecs, RF synthesizers, and high-resolution ADCs |
| CMOS enable with internal pull-down | 5MΩ on-chip resistor eliminates need for external pull-down, reducing BOM count and board area |
| Ceramic capacitor compatibility | Stable with 1µF output capacitance (ESR 0.01–100Ω) - enables use of small, low-ESR MLCCs instead of larger tantalum |
| High PSRR at high frequency | 70dB @ 10kHz - effectively filters ripple from switching regulators operating at 100kHz–2MHz |
| Precision output accuracy | ±2% over temperature and load - reduces need for post-regulation trimming in production calibration |
| Low dropout at full load | 150mV @ 100mA - maximizes usable battery voltage range in single-cell Li-ion applications |
Applications
| Mobile Audio Subsystem | RF Front-End Bias Rail |
|---|---|
|
Use Scenario: Powering DACs, headphone amplifiers, and MEMS microphones in smartphones and wireless earbuds. IC Role / Device Role / Timing Role: Low-noise local LDO supplying clean 3.0V bias to analog signal chain components. Use Value: 30µVrms noise prevents audible hiss and preserves dynamic range in 24-bit audio paths. |
Use Scenario: Supplying bias voltage to LNAs, mixers, and VCOs in Bluetooth/Wi-Fi transceivers. IC Role / Device Role / Timing Role: Stable 3.0V rail decoupling RF ICs from noisy digital supply domains. Use Value: 70dB PSRR at 10kHz suppresses digital switching noise that would otherwise degrade receiver sensitivity. |
| Portable Medical Sensor Node | Industrial IoT Edge Controller |
|
Use Scenario: Powering precision analog front-ends (AFE) in wearable ECG/SpO₂ monitors. IC Role / Device Role / Timing Role: Ultra-stable 3.0V reference source for low-drift instrumentation amplifiers and sigma-delta ADCs. Use Value: ±2% output accuracy and <±300µV/°C drift ensure consistent measurement calibration across operating temperature. |
Use Scenario: Providing regulated 3.0V supply to microcontroller I/O banks and isolated communication interfaces (e.g., RS-485, CAN transceivers). IC Role / Device Role / Timing Role: Local point-of-load regulator ensuring logic-level integrity and ESD robustness. Use Value: Active-high CE pin allows synchronized power sequencing with MCU GPIO, supporting controlled boot-up and deep-sleep entry. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AP7315-30W5-7 | Higher quiescent current (50µA typ.), lower PSRR (60dB @ 10kHz), same 3.0V output and SOT-23-5 package | Less suitable for ultra-low-power or high-PSRR applications; optimized for cost-sensitive consumer devices | Select when BOM cost is prioritized over noise/PSRR and standby current is not critical |
| MCP1700T-3002E/TT | Lower max output current (250mA), higher dropout (300mV @ 250mA), 4µA quiescent current, SOT-23-3 package (no CE pin) | Lacks enable control and has reduced noise performance (110µVrms); requires external enable circuitry | Select only if enable functionality is unnecessary and lowest possible quiescent current dominates design requirements |
Compared with AP7315-30W5-7 and MCP1700T-3002E/TT, the AP2122AK-3.0TRG1 uniquely balances ultra-low noise, high PSRR, integrated enable with pull-down, and tight output accuracy - making it optimal for noise-critical, battery-constrained, and space-limited embedded systems where all four attributes are simultaneously required.
Availability
AP2122AK-3.0TRG1 is available at Aetrix Electronics and suitable for mobile audio subsystems, RF front-end bias rails, portable medical sensor nodes, and industrial IoT edge controllers requiring stable component supply with RoHS-compliant and green material compliance.
Supply support for AP2122AK-3.0TRG1 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
Diodes Incorporated is a global manufacturer of discrete semiconductors and analog ICs, specializing in high-performance power management, signal integrity, and protection solutions for industrial, computing, and consumer markets.
The AP2122 series belongs to Diodes' precision LDO portfolio, designed specifically for battery-powered and noise-sensitive applications demanding ultra-low noise, high PSRR, and minimal quiescent current in miniature packages.
FAQ
What is the minimum input voltage required for regulation at 3.0V output?
The AP2122AK-3.0TRG1 maintains regulation when input voltage is at least 3.15V under 100mA load (3.0V + 150mV dropout). At lighter loads (e.g., 10mA), dropout drops to 20mV, allowing regulation from as low as 3.02V. Input must remain ≥2V per absolute maximum ratings, but regulation ceases below VOUT + VDROP.
Can the AP2122AK-3.0TRG1 be used with a 0.47µF output capacitor?
No - the datasheet specifies a minimum output capacitance of >1µF with ESR between 0.01Ω and 100Ω for guaranteed stability. Using 0.47µF risks oscillation or poor transient response. Ceramic capacitors rated ≥1µF (e.g., X5R/X7R 0603 or 0805) are recommended and validated.
Is the NC pin (Pin 4) safe to connect to ground or leave floating?
Pin 4 is internally unconnected and must remain floating - no trace, solder mask opening, or copper pour should contact it. Connecting it to ground or any other net may cause unpredictable behavior or damage due to internal isolation violation. The datasheet explicitly states "NC" and shows no internal bond wire.
How does the CE pin behave during power-up when no external driver is connected?
The CE pin has an internal 5MΩ pull-down resistor to GND, so it defaults to logic low at power-up, keeping the device in shutdown until a valid high signal (>1.5V) is applied. This ensures the output remains off during system initialization, preventing unintended power-on of downstream circuitry.
AP2122AK-3.0TRG1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 6V
- Voltage - Output (Min/Fixed):
- 3V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 0.4V @ 150mA
- Current - Output:
- 150mA
- Current - Quiescent (Iq):
- 50 µA
- Current - Supply (Max):
- -
- PSRR:
- 70dB (10kHz)
- Control Features:
- Enable
- Protection Features:
- Over Current
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
AP2122AK-3.0TRG1 FAQ
1.How can I place an order for AP2122AK-3.0TRG1 through Aetrix?
Please submit a Request for Quotation (RFQ) for AP2122AK-3.0TRG1 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 AP2122AK-3.0TRG1 reliable?
The price and inventory of AP2122AK-3.0TRG1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP2122AK-3.0TRG1 is usually 5 days.
3.What payment methods are accepted for AP2122AK-3.0TRG1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP2122AK-3.0TRG1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP2122AK-3.0TRG1?
AP2122AK-3.0TRG1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP2122AK-3.0TRG1 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 AP2122AK-3.0TRG1?
For technical support, including AP2122AK-3.0TRG1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP2122AK-3.0TRG1 requirements.
6.How does Aetrix verify that AP2122AK-3.0TRG1 is sourced from the original manufacturer or authorized distributors?
All AP2122AK-3.0TRG1 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 AP2122AK-3.0TRG1 meets industry standards.
7.What is the process for return or replacement of AP2122AK-3.0TRG1?
All AP2122AK-3.0TRG1 units undergo pre-shipment inspection (PSI). If there is an issue with AP2122AK-3.0TRG1, 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 AP2122AK-3.0TRG1 part is unused and in its original packaging.
Return procedure for AP2122AK-3.0TRG1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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