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Diodes Incorporated AP2125AK-1.8TRG1
- Part No.:
- AP2125AK-1.8TRG1
- Manufacturer:
- Diodes Incorporated
- Package:
- SOT-23-5 Thin, TSOT-23-5
- Datasheet:
-
AP2125AK-1.8TRG1.pdf
- Description:
- IC REG LINEAR 1.8V 360MA TSOT25
- Quantity:
- Payment:
- Shipping:
Inventory:4,279
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Product details
Overview
AP2125AK-1.8TRG1 from Diodes Incorporated is a 300mA, fixed-output 1.8V CMOS low-dropout (LDO) regulator in SC-70-5 package, featuring 50µVrms output noise, 70dB PSRR at 100Hz/1kHz, ±2% output voltage accuracy, and 0.01µA standby current. It integrates over-temperature shutdown and current limiting, and is optimized for noise-sensitive battery-powered applications such as GSM/CDMA handset baseband supplies.
For engineers reviewing the AP2125AK-1.8TRG1 datasheet, AP2125AK-1.8TRG1 pinout, AP2125AK-1.8TRG1 application, or AP2125AK-1.8TRG1 equivalent, key selection criteria include ultra-low noise performance, SC-70-5 footprint compatibility, enable-controlled power sequencing, dropout voltage under 12mV at 10mA load, and ceramic capacitor stability without ESR requirements.
Technical Context
The AP2125AK-1.8TRG1 employs a CMOS-based error amplifier with internal voltage reference and resistor network to regulate 1.8V output across input voltages from 2.3V to 6V. Its architecture includes active high CE control, thermal shutdown at +160°C with +25°C hysteresis, and short-circuit current limiting of 50mA.
It achieves stable regulation using only 1µF input and output ceramic capacitors due to inherent phase margin design, eliminating need for external ESR tuning. The device operates across –40°C to +85°C ambient, with quiescent current held to 60µA typical and load regulation of ≤15mV over 1–300mA.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.8V ±2% (1.764–1.836V), enabling precise core logic rail generation for 1.8V I/O interfaces. |
| Max Output Current | 300mA minimum, supporting moderate-power microcontrollers and RF front-end biasing. |
| Dropout Voltage | 12mV typical at 10mA, 120mV at 100mA - allows operation with minimal VIN–VOUT headroom (e.g., 1.812V input at light load). |
| RMS Output Noise | 50µVrms (10Hz–100kHz), critical for analog sensor signal chains and ADC reference stability. |
| PSRR | 70dB typical at 100Hz/1kHz, suppressing switching noise from upstream DC/DC converters. |
| Quiescent Current | 60µA typical, minimizing battery drain in always-on subsystems like real-time clocks or wake-up monitors. |
| Standby Current | 0.01µA typical when CE = low, enabling nanoamp-level system sleep states. |
| Thermal Shutdown | Activates at +160°C junction temperature with +25°C hysteresis, preventing permanent damage during sustained overload. |
Pinout & Package
AP2125AK-1.8TRG1 uses the SC-70-5 surface-mount package (1.25mm × 1.65mm × 0.95mm), rated for θJA = 300°C/W, suitable for space-constrained portable designs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (VIN) | Input voltage supply | Accepts 2.3V–6V DC; requires 1µF ceramic decoupling close to pin for stability. |
| 2 (GND) | Ground reference | Common return path for input, output, and internal circuits; must be low-impedance connection. |
| 3 (CE) | Enable control input | Active-high logic: ≥1.5V enables regulation; ≤0.4V disables output and reduces IQ to 0.01µA. |
| 4 (NC) | No connection | Internally unconnected; must remain floating or grounded per layout best practice (not driven). |
| 5 (VOUT) | Regulated output | Delivers 1.8V ±2% to load; requires 1µF ceramic output capacitor with ESR < 1Ω for stability. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low noise regulation | 50µVrms output noise enables clean power for precision analog circuits without post-LDO filtering. |
| CMOS process architecture | Enables 0.01µA shutdown current and eliminates PNP pass transistor leakage limitations. |
| Low-ESR ceramic capacitor support | Stable with 1µF X5R/X7R ceramics on input/output - no tantalum or electrolytic required. |
| High PSRR at audio frequencies | 70dB rejection at 100Hz/1kHz suppresses ripple from buck converter switching artifacts. |
| Integrated protection | Combines current limit (50mA), thermal shutdown (+160°C), and safe-start circuitry in single die. |
Applications
| CDMA/GSM Handset Baseband | Laptop Subsystem Power |
|---|---|
|
Use Scenario: Powering 1.8V digital baseband processors and RF transceiver I/O in dual-mode cellular handsets. IC Role / Device Role / Timing Role: Primary LDO delivering clean, sequenced 1.8V rail with CE-controlled power-up/down timing. Use Value: 50µVrms noise prevents bit errors in high-speed data interfaces; 0.01µA shutdown extends standby battery life beyond 30 days. |
Use Scenario: Supplying 1.8V I/O rails for embedded controllers and touchpad interfaces in ultrabook subassemblies. IC Role / Device Role / Timing Role: Secondary LDO providing isolated, low-noise domain for human-interface peripherals. Use Value: 70dB PSRR blocks noise coupling from main CPU VRM; SC-70-5 footprint saves >40% board area vs. SOT-23-5 alternatives. |
| Handheld Instrument ADC Reference | PCMCIA Card Logic Supply |
|
Use Scenario: Generating stable 1.8V reference voltage for 16-bit SAR ADCs in portable multimeters and data loggers. IC Role / Device Role / Timing Role: Precision analog LDO supplying ADC VDD and reference buffer inputs. Use Value: ±2% output accuracy and ±100ppm/°C tempco ensure <0.1% full-scale error drift over –20°C to +70°C operating range. |
Use Scenario: Providing 1.8V logic power to PCMCIA/CardBus interface controllers in legacy industrial docking stations. IC Role / Device Role / Timing Role: Compact, RoHS-compliant LDO meeting JEDEC MO-203-AB mechanical and thermal specs. Use Value: SC-70-5 package meets PCMCIA card height constraints (<1.0mm); green halogen-free construction satisfies IPC-1752 reporting. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MCP1700T-1802E/TT | 250mA max output, 175mV dropout at 250mA, 30µVrms noise, SOT-23-3 package | Lacks enable pin and thermal shutdown; limited to lower-current, non-sequenced rails | Select when board space permits SOT-23-3 and enable/control logic is handled externally. |
| Torex XC6206P182MR-G | 300mA output, 150mV dropout at 100mA, 40µVrms noise, SOT-25 package (5-pin, same pinout) | Requires 2.2µF output cap; no NC pin - pin 4 is VOUT in alternate revision | Choose for tighter noise spec (40µVrms) if layout accommodates larger output capacitor and pin mapping verification. |
Compared with MCP1700T-1802E/TT, AP2125AK-1.8TRG1 adds enable control and thermal protection at identical noise level; versus XC6206P182MR-G, it achieves lower dropout and supports smaller 1µF output caps but trades 10µVrms higher noise.
Availability
AP2125AK-1.8TRG1 is available at Aetrix Electronics and suitable for CDMA/GSM handset design, handheld instrument production, and laptop subsystem integration requiring stable component supply, consistent parametric performance, and long-term RoHS/Green compliance.
Supply support for AP2125AK-1.8TRG1 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-reliability power management, signal integrity, and protection solutions for consumer, industrial, and automotive markets.
The AP2125 series belongs to Diodes' precision LDO product line, engineered specifically for ultra-low-noise, low-quiescent-current regulation in space- and battery-constrained portable electronics.
FAQ
What is the minimum input voltage required for AP2125AK-1.8TRG1 to maintain regulation at 300mA?
The minimum input voltage is VOUT + VDROP = 1.8V + 360mV = 2.16V, based on maximum dropout of 360mV at 300mA (per Electrical Characteristics table). However, recommended operation starts at VIN ≥ VOUT + 0.5V = 2.3V to ensure margin across temperature and process variation.
Can AP2125AK-1.8TRG1 operate with a 0.47µF output capacitor?
No - the datasheet specifies 1µF minimum ceramic output capacitance for stability. Using 0.47µF risks oscillation or poor transient response, as confirmed by ESR vs. output current plots showing instability region below 0.8µF in SC-70-5 configuration.
Is the NC pin (Pin 4) required to be left floating or may it be grounded?
Pin 4 is internally unconnected and must be left floating per Diodes' layout guidelines. Grounding it is not prohibited but provides no benefit and risks unintended coupling in high-frequency layouts; standard practice is to omit copper connection entirely.
How does the CE pin behave during power-up when VIN ramps slowly?
The CE pin has no internal pull-up or pull-down; it must be actively driven. If left floating during power-up, undefined logic state may cause erratic enable/disable behavior. A 100kΩ pull-up to VIN is recommended to guarantee high-enable at power-on unless controlled sequencing is required.
AP2125AK-1.8TRG1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- SOT-23-5 Thin, TSOT-23-5
- 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):
- 1.8V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 0.36V @ 300mA
- Current - Output:
- 360mA
- Current - Quiescent (Iq):
- 90 µA
- Current - Supply (Max):
- -
- PSRR:
- 70db (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:
- TSOT-25
AP2125AK-1.8TRG1 FAQ
1.How can I place an order for AP2125AK-1.8TRG1 through Aetrix?
Please submit a Request for Quotation (RFQ) for AP2125AK-1.8TRG1 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 AP2125AK-1.8TRG1 reliable?
The price and inventory of AP2125AK-1.8TRG1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP2125AK-1.8TRG1 is usually 5 days.
3.What payment methods are accepted for AP2125AK-1.8TRG1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP2125AK-1.8TRG1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP2125AK-1.8TRG1?
AP2125AK-1.8TRG1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP2125AK-1.8TRG1 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 AP2125AK-1.8TRG1?
For technical support, including AP2125AK-1.8TRG1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP2125AK-1.8TRG1 requirements.
6.How does Aetrix verify that AP2125AK-1.8TRG1 is sourced from the original manufacturer or authorized distributors?
All AP2125AK-1.8TRG1 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 AP2125AK-1.8TRG1 meets industry standards.
7.What is the process for return or replacement of AP2125AK-1.8TRG1?
All AP2125AK-1.8TRG1 units undergo pre-shipment inspection (PSI). If there is an issue with AP2125AK-1.8TRG1, 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 AP2125AK-1.8TRG1 part is unused and in its original packaging.
Return procedure for AP2125AK-1.8TRG1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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