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Diodes Incorporated AP2127K-2.8TRG1
- Part No.:
- AP2127K-2.8TRG1
- Manufacturer:
- Diodes Incorporated
- Package:
- SC-74A, SOT-753
- Datasheet:
-
AP2127K-2.8TRG1.pdf
- Description:
- IC REG LINEAR 2.8V 300MA SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:26,558
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Product details
Overview
AP2127K-2.8TRG1 from Diodes Incorporated is a 300mA, 2.8V fixed-output CMOS low-dropout (LDO) regulator in SOT-23-5 package. It delivers ±2% output voltage accuracy, 170mV dropout at 300mA, 60μA typical quiescent current, and 60μVRMS output noise - optimized for powering noise-sensitive analog rails in portable electronics.
For engineers reviewing the AP2127K-2.8TRG1 datasheet, AP2127K-2.8TRG1 pinout, AP2127K-2.8TRG1 application, or AP2127K-2.8TRG1 equivalent, key selection criteria include low-noise performance under light-to-moderate load, fast soft-start (50μs), integrated shutdown control with auto-discharge (60Ω RDS(ON)), and compatibility with 1μF ceramic input/output capacitors.
Technical Context
The AP2127K-2.8TRG1 uses a PMOS pass transistor architecture enabling ultra-low dropout and near-zero reverse current during shutdown. Its internal 0.8V reference feeds a precision error amplifier that maintains regulation across –40°C to +85°C ambient with ±100ppm/°C temperature coefficient.
It integrates active shutdown logic with 1.5V high-threshold and 0.5V low-threshold inputs, thermal shutdown at +165°C with +30°C hysteresis, and current limiting at 50mA during short-circuit events - all without external components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 2.8V ±2% - ensures stable biasing for RF front-end ICs and ADC reference supplies. |
| Max Output Current | 300mA - supports moderate-power microcontrollers, sensors, and interface ICs in space-constrained designs. |
| Dropout Voltage | 170mV @ 300mA - enables operation from single-cell Li-ion (3.0V min) or two-cell alkaline (3.2V min) with margin. |
| PSRR | 68dB @ 1kHz - suppresses switching noise from adjacent DC-DC converters feeding shared input rails. |
| Output Noise | 60μVRMS - meets stringent requirements for audio codecs, precision op-amps, and low-noise sensor signal chains. |
| Quiescent Current | 60μA typical - extends battery life in always-on monitoring circuits and IoT endpoint sleep modes. |
| Shutdown Current | 0.1μA - enables true zero-power state when system is inactive, critical for energy-harvesting applications. |
Pinout & Package
SOT-23-5 package with exposed thermal pad (connected to GND for enhanced thermal performance). Pin 1 = VIN, Pin 2 = GND, Pin 3 = VOUT, Pin 4 = Shutdown, Pin 5 = NC/ADJ (no connection for fixed-output version).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pin 1) | Power Input | Accepts 2.5V–6V input; requires 1μF ceramic decoupling capacitor placed adjacent to pin for stability. |
| GND (Pin 2) | Ground Reference | Common return path for input, output, and internal circuitry; must be connected to low-impedance PCB ground plane. |
| VOUT (Pin 3) | Regulated Output | Delivers 2.8V ±2% to load; supports 1μF ceramic output capacitor for transient response and noise filtering. |
| Shutdown (Pin 4) | Enable Control Input | Active-high logic input; drives device into 0.1μA standby mode when pulled below 0.5V; includes 3MΩ internal pull-down. |
| NC/ADJ (Pin 5) | No Connection | Not bonded internally for fixed-output variants; must be left floating or tied to GND - no external feedback required. |
Key Features
| Feature | Design Value |
|---|---|
| Low-noise regulation | 60μVRMS output noise enables direct powering of RF synthesizers and precision ADCs without additional filtering. |
| Fast soft-start | 50μs startup time prevents inrush current and output overshoot during power-up sequencing. |
| Auto-discharge function | Integrated 60Ω discharge MOSFET between VOUT and GND clears residual charge on output capacitors within milliseconds after shutdown. |
| Ceramic capacitor compatible | Stable with ≥1μF X5R/X7R MLCCs on both input and output - eliminates need for costly tantalum or electrolytic capacitors. |
| Thermal protection | Internal +165°C shutdown with +30°C hysteresis prevents latch-up during sustained overload or poor PCB thermal design. |
Applications
| Wireless Sensor Node Power | USB-C Peripheral Bias Rail |
|---|---|
|
Use Scenario: Powers BLE SoC, environmental sensor array, and flash memory in battery-operated industrial sensor nodes. IC Role / Device Role / Timing Role: Primary 2.8V LDO supplying core logic and analog front-end; provides clean, low-noise supply independent of host USB or battery voltage variation. Use Value: 60μVRMS noise and ±2% accuracy ensure reliable ADC sampling and RF transmission integrity over full temperature range. |
Use Scenario: Generates 2.8V bias for USB-C PD controller logic and Type-C port configuration channel (CC) termination resistors. IC Role / Device Role / Timing Role: Secondary LDO downstream of buck converter; regulated output powers digital control logic requiring precise voltage thresholds. Use Value: 170mV dropout allows operation from 3.3V intermediate rail with headroom for line drop, while 0.1μA shutdown current minimizes standby drain. |
| Portable Audio DAC Supply | Embedded Display Backlight Driver Bias |
|
Use Scenario: Supplies 2.8V reference and analog section of stereo audio DAC in wireless headphones and portable media players. IC Role / Device Role / Timing Role: Low-noise analog rail generator; isolates sensitive DAC circuitry from noisy digital supply domains. Use Value: 68dB PSRR at 1kHz rejects ripple from shared 3.3V system rail, preserving SNR >110dB in audio signal path. |
Use Scenario: Provides 2.8V gate bias for discrete LED driver FETs in small-form-factor LCD displays (e.g., smartwatches, medical handhelds). IC Role / Device Role / Timing Role: Gate voltage reference source; enables precise current control in constant-current LED drivers. Use Value: ±2% output accuracy ensures consistent LED brightness across units and temperature, while 300mA rating supports multi-string configurations. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MCP1700T-2802E/TT | 250mA max output, 175mV dropout @ 250mA, 2.5μA quiescent current, no shutdown pin | Lacks enable/shutdown control and auto-discharge; suited only for always-on, ultra-low-IQ applications | Select when lowest possible quiescent current is prioritized over output current capability and control features. |
| Torex XC6206P282MR-G | 150mA max output, 160mV dropout @ 150mA, 1.0μA IQ, SOT-23-3 package (3-pin) | No shutdown or discharge function; smaller footprint but lower current and no enable logic | Choose for minimal board area in low-current sensor biasing where control signals are unnecessary. |
Compared with MCP1700T-2802E/TT and XC6206P282MR-G, the AP2127K-2.8TRG1 uniquely combines 300mA drive, integrated shutdown with auto-discharge, and industry-leading 60μVRMS noise - making it optimal for compact, battery-powered systems requiring both performance and controllability.
Availability
AP2127K-2.8TRG1 is available at Aetrix Electronics and suitable for wireless sensor nodes, portable audio subsystems, USB-C peripheral power management, and embedded display biasing requiring stable component supply and long-term manufacturability.
Supply support for AP2127K-2.8TRG1 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 semiconductor company specializing in discrete, analog, and mixed-signal solutions for power management, signal integrity, and connectivity applications.
The AP2127 series belongs to Diodes' high-performance LDO portfolio, designed specifically for battery-powered and noise-sensitive applications demanding ultra-low noise, fast transient response, and robust protection features in miniature packages.
FAQ
What is the minimum input voltage required for AP2127K-2.8TRG1 to maintain regulation at full 300mA load?
The minimum input voltage is calculated as VOUT + VDROP = 2.8V + 0.17V = 2.97V. Per datasheet specifications, the device sustains regulation down to 2.97V input at 300mA and 25°C ambient. At higher temperatures or worst-case tolerance, 3.0V is recommended for design margin.
Can AP2127K-2.8TRG1 be used with ceramic capacitors smaller than 1μF?
No - the datasheet explicitly specifies 1μF minimum for both CIN and COUT to ensure stability across temperature and load conditions. Using smaller values risks oscillation or degraded transient response, especially under 300mA step loads.
Is the NC/ADJ pin (Pin 5) required to be terminated for the fixed 2.8V version?
No - Pin 5 is unconnected internally for fixed-output variants like AP2127K-2.8TRG1. It may be left floating or tied to GND; neither configuration affects operation. Do not connect to any voltage or feedback network.
Does the auto-discharge function activate automatically during shutdown, or does it require external circuitry?
The auto-discharge MOSFET is fully integrated and activates automatically when the Shutdown pin is driven low (<0.5V). No external components are needed - the 60Ω RDS(ON) discharges VOUT to GND within ~1ms for a 10μF output capacitor, eliminating hold-up voltage issues.
AP2127K-2.8TRG1 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):
- 2.8V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 0.3V @ 300mA
- Current - Output:
- 300mA
- Current - Quiescent (Iq):
- 90 µA
- Current - Supply (Max):
- -
- PSRR:
- 68dB ~ 54dB (100Hz ~ 10kHz)
- Control Features:
- -
- Protection Features:
- Over Current, Over Temperature
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
AP2127K-2.8TRG1 FAQ
1.How can I place an order for AP2127K-2.8TRG1 through Aetrix?
Please submit a Request for Quotation (RFQ) for AP2127K-2.8TRG1 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 AP2127K-2.8TRG1 reliable?
The price and inventory of AP2127K-2.8TRG1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP2127K-2.8TRG1 is usually 5 days.
3.What payment methods are accepted for AP2127K-2.8TRG1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP2127K-2.8TRG1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP2127K-2.8TRG1?
AP2127K-2.8TRG1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP2127K-2.8TRG1 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 AP2127K-2.8TRG1?
For technical support, including AP2127K-2.8TRG1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP2127K-2.8TRG1 requirements.
6.How does Aetrix verify that AP2127K-2.8TRG1 is sourced from the original manufacturer or authorized distributors?
All AP2127K-2.8TRG1 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 AP2127K-2.8TRG1 meets industry standards.
7.What is the process for return or replacement of AP2127K-2.8TRG1?
All AP2127K-2.8TRG1 units undergo pre-shipment inspection (PSI). If there is an issue with AP2127K-2.8TRG1, 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 AP2127K-2.8TRG1 part is unused and in its original packaging.
Return procedure for AP2127K-2.8TRG1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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