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Diodes Incorporated AP2125K-2.8TRG1
- Part No.:
- AP2125K-2.8TRG1
- Manufacturer:
- Diodes Incorporated
- Package:
- SC-74A, SOT-753
- Datasheet:
-
AP2125K-2.8TRG1.pdf
- Description:
- IC REG LINEAR 2.8V 300MA SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:7,240
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Product details
Overview
AP2125K-2.8TRG1 from Diodes Incorporated is a 300mA, fixed-output 2.8V CMOS low-dropout (LDO) regulator in SC-70-5 package, featuring 50µVrms output noise, 65mV dropout at 100mA, ±2% output voltage accuracy, and active-high enable control. It delivers stable power to noise-sensitive RF and analog circuitry in compact battery-powered devices.
For engineers reviewing the AP2125K-2.8TRG1 datasheet, AP2125K-2.8TRG1 pinout, AP2125K-2.8TRG1 application, or AP2125K-2.8TRG1 equivalent, key selection criteria include ultra-low noise performance, SC-70-5 footprint compatibility, CE-controlled shutdown capability, and ceramic capacitor compatibility without external compensation.
Technical Context
The AP2125K-2.8TRG1 integrates a precision voltage reference, error amplifier, resistor network for fixed 2.8V output, over-temperature shutdown (160°C trip), and current-limit protection (50mA short-circuit). Its CMOS architecture enables 60µA quiescent current and 0.01µA standby current under CE disable.
It operates across -40°C to +85°C ambient, supports input voltages from 3.3V to 6V (VIN ≥ VOUT + 0.5V), and maintains load regulation within ±11mV (1–300mA) and line regulation within ±1mV (3.8–6V).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 2.8V ±2% - ensures stable biasing for 2.8V logic rails and RF front-end ICs |
| Max Output Current | 300mA minimum - sufficient for powering baseband processors or sensor subsystems |
| Dropout Voltage | 65mV at 100mA - enables operation with minimal headroom (e.g., 3.3V input → 2.8V output) |
| RMS Output Noise | 50µVrms (10Hz–100kHz) - critical for preserving SNR in audio codecs and ADC references |
| PSRR | 65dB at 1kHz - suppresses switching noise from upstream DC/DC converters |
| Quiescent Current | 60µA typical - extends battery life in always-on sensor nodes |
| Enable Threshold | CE high ≥1.5V, low ≤0.4V - compatible with 1.8V/3.3V GPIO without level-shifting |
Pinout & Package
AP2125K-2.8TRG1 uses the SC-70-5 surface-mount package (1.6mm × 1.6mm × 0.9mm), optimized for space-constrained portable designs. Pin assignments are validated per Diodes DS38144 Rev. 2–2.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | VIN | Main input supply connection; accepts 3.3–6V with ≥0.5V headroom over VOUT |
| 2 | GND | Analog ground reference; must be low-impedance path to minimize noise coupling |
| 3 | NC | No internal connection; left unconnected per datasheet |
| 4 | CE | Active-high enable; drives into shutdown mode (<0.4V) to reduce ISTD to 0.01µA |
| 5 | VOUT | Regulated 2.8V output; requires ≥1µF ceramic capacitor with ESR <1Ω for stability |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low noise regulation | 50µVrms output noise enables clean power for RF transceivers and precision ADCs |
| CMOS-based LDO architecture | 60µA quiescent current and 0.01µA shutdown current extend battery runtime in IoT sensors |
| Thermal and current protection | Integrated OTSD (160°C trip) and 50mA short-circuit limit prevent damage during fault conditions |
| Ceramic capacitor compatibility | Stable with ≥1µF X5R/X7R ceramics - eliminates need for costly tantalum or electrolytic capacitors |
| High PSRR at audio frequencies | 65dB rejection at 1kHz suppresses ripple from buck converter switching artifacts |
Applications
| CDMA/GSM Handset Power | Laptop Subsystem Supply |
|---|---|
Use Scenario: Providing clean 2.8V bias to GSM PA driver stages and RF synthesizer VCOs. IC Role / Device Role / Timing Role: Low-noise post-regulator for RF signal chain power domains. Use Value: 50µVrms noise prevents phase noise degradation and adjacent-channel interference. | Use Scenario: Powering embedded controller peripherals (e.g., touchpad interface, keyboard controller) in ultrabook designs. IC Role / Device Role / Timing Role: Standby-capable voltage source enabling rapid wake-from-sleep transitions. Use Value: 0.01µA shutdown current minimizes battery drain during lid-closed state. |
| Handheld Instrument Reference | PCMCIA Card Core Logic |
Use Scenario: Supplying reference voltage to 16-bit SAR ADCs and precision op-amps in portable multimeters. IC Role / Device Role / Timing Role: Precision analog rail generator with ±2% accuracy and low thermal drift (±100ppm/°C). Use Value: Maintains measurement accuracy across -40°C to +85°C operating range without calibration drift. | Use Scenario: Delivering regulated 2.8V to PCMCIA card controller ASICs and SRAM buffers. IC Role / Device Role / Timing Role: Compact, enable-controlled power domain manager for hot-plug interfaces. Use Value: SC-70-5 footprint fits tight card-edge layouts; CE pin allows host-driven power sequencing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AP2125N-2.8TRG1 | SOT-23-3 package (3-pin); no CE pin or NC terminal; fixed output only | Lacks enable control and occupies larger PCB area; suitable for cost-sensitive, non-sequenced rails | Select when board space permits SOT-23-3 and system-level power sequencing is handled externally |
| MCP1700T-2802E/TT | 250mA max output; 175mV dropout at 250mA; 30µVrms noise; SOT-23-3 | Lower current capacity and higher dropout limit its use in high-load 2.8V domains | Choose only for sub-200mA loads where ultra-low noise is secondary to cost and footprint |
Compared with AP2125N-2.8TRG1, the K-variant adds enable control and reduces footprint by 35%; versus MCP1700T-2802E/TT, it provides 20% higher current, 37% lower dropout, and retains full SC-70-5 integration for space-constrained designs.
Availability
AP2125K-2.8TRG1 is available at Aetrix Electronics and suitable for CDMA/GSM handset design, handheld instrument development, laptop subsystem integration, and PCMCIA card manufacturing requiring stable component supply and long-term production continuity.
Supply support for AP2125K-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 manufacturer of discrete semiconductors and analog ICs, specializing in high-performance, energy-efficient components for consumer, computing, industrial, and communications markets.
The AP2125 series belongs to Diodes' precision LDO regulator product line, engineered specifically for battery-powered portable electronics demanding ultra-low noise, low quiescent current, and small-footprint packaging.
FAQ
What is the minimum input voltage required for AP2125K-2.8TRG1 to regulate 2.8V output?
The AP2125K-2.8TRG1 requires VIN ≥ VOUT + 0.5V = 3.3V under all operating conditions per Recommended Operating Conditions. At 100mA load, dropout is 65mV, but the 0.5V margin ensures guaranteed regulation across temperature, line, and load variations per datasheet specification.
Can AP2125K-2.8TRG1 operate with a 1µF ceramic output capacitor?
Yes - the device is explicitly characterized and stabilized with a 1µF X5R/X7R ceramic capacitor (ESR <1Ω) on VOUT, as confirmed in the Typical Applications Circuit and ESR vs. Output Current plot (DS38144 p.15). No additional series resistance or parallel capacitance is required.
Does AP2125K-2.8TRG1 support reverse-voltage protection?
No - the AP2125K-2.8TRG1 lacks integrated reverse-voltage protection. Applying reverse polarity to VIN or VOUT may cause permanent damage. External protection (e.g., series Schottky diode on VIN) is required if system-level reverse-battery or miswiring risk exists.
How does the CE pin behave during power-up and power-down sequencing?
The CE pin is internally pulled down; the device remains in shutdown until CE reaches ≥1.5V. During power-down, CE falling below 0.4V initiates fast discharge of VOUT via an internal 120Ω path (auto-discharge function), reducing VOUT to <0.4V within ~100µs for safe downstream IC reset sequencing.
AP2125K-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:
- 65dB (100Hz ~ 1kHz)
- Control Features:
- Enable
- Protection Features:
- Over Current, Over Temperature
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
AP2125K-2.8TRG1 FAQ
1.How can I place an order for AP2125K-2.8TRG1 through Aetrix?
Please submit a Request for Quotation (RFQ) for AP2125K-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 AP2125K-2.8TRG1 reliable?
The price and inventory of AP2125K-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 AP2125K-2.8TRG1 is usually 5 days.
3.What payment methods are accepted for AP2125K-2.8TRG1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP2125K-2.8TRG1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP2125K-2.8TRG1?
AP2125K-2.8TRG1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP2125K-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 AP2125K-2.8TRG1?
For technical support, including AP2125K-2.8TRG1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP2125K-2.8TRG1 requirements.
6.How does Aetrix verify that AP2125K-2.8TRG1 is sourced from the original manufacturer or authorized distributors?
All AP2125K-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 AP2125K-2.8TRG1 meets industry standards.
7.What is the process for return or replacement of AP2125K-2.8TRG1?
All AP2125K-2.8TRG1 units undergo pre-shipment inspection (PSI). If there is an issue with AP2125K-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 AP2125K-2.8TRG1 part is unused and in its original packaging.
Return procedure for AP2125K-2.8TRG1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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