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Diodes Incorporated AP2128K-1.5TRG1
- Part No.:
- AP2128K-1.5TRG1
- Manufacturer:
- Diodes Incorporated
- Package:
- SC-74A, SOT-753
- Datasheet:
-
AP2128K-1.5TRG1.pdf
- Description:
- IC REG LINEAR 1.5V 300MA SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:4,184
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Product details
Overview
AP2128K-1.5TRG1 from BCD Semiconductor Manufacturing Limited is a fixed-output 1.5V, 300mA CMOS low-dropout linear regulator in SOT-23-5 package, featuring 900–1000mV dropout at 300mA, ±2% output voltage accuracy, and 60µVrms output noise. It integrates shutdown control, soft-start (50µs), thermal protection, and auto-discharge (60Ω RDS(ON)), optimized for powering noise-sensitive analog circuitry in portable computing systems.
For engineers reviewing the AP2128K-1.5TRG1 datasheet, AP2128K-1.5TRG1 pinout, AP2128K-1.5TRG1 application, or AP2128K-1.5TRG1 equivalent, key selection criteria include dropout performance at 1.5V output, PSRR (68dB @ 1kHz), standby current (0.1µA), compatibility with 1µF ceramic capacitors, and thermal shutdown behavior at 165°C.
Technical Context
The AP2128K-1.5TRG1 employs a PMOS pass transistor architecture enabling ultra-low quiescent current (60µA typical) and stable regulation down to 2.5V input. Its internal reference (0.8V) and feedback network are trimmed to deliver precise 1.5V output across -40°C to +85°C ambient.
Shutdown functionality is implemented via a dedicated logic-level input (0–0.4V "Low", 1.5–6V "High") that disables the regulator and activates the 60Ω VOUT discharge path. The integrated soft-start limits inrush current by controlling output ramp rate over 50µs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.5V ±2% - ensures stable core/bias rail for ADCs, sensors, and RF front-ends without external resistors. |
| Dropout Voltage | 900–1000mV @ 300mA - enables operation from 2.5V input while maintaining regulation; supports single-cell LiFePO₄ or dual-cell alkaline inputs. |
| PSRR | 68dB @ 1kHz - suppresses switching noise from upstream DC/DC converters feeding sensitive analog signal chains. |
| Output Noise | 60µVrms @ 10Hz–100kHz - minimizes jitter and quantization error in precision data acquisition systems. |
| Quiescent Current | 60µA typical - extends battery life in always-on monitoring circuits without sacrificing startup speed. |
| Shutdown Current | 0.1µA - reduces system standby power to sub-microwatt levels during deep sleep modes. |
| Thermal Shutdown | 165°C with 30°C hysteresis - prevents permanent damage during sustained overload or poor PCB thermal design. |
Pinout & Package
SOT-23-5 package (2.82 × 2.65 × 1.30 mm), RoHS-compliant and green (G1 suffix), with exposed pad not electrically connected.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Input supply connection | Accepts 2.5–6V input; requires 1µF ceramic capacitor for stability and transient response. |
| GND | Ground reference | Common return for input/output paths and internal bias; must be low-impedance for noise rejection. |
| VOUT | Regulated output | Delivers 1.5V ±2%; connects to 1µF ceramic output capacitor for loop stability and load transient suppression. |
| SHUTDOWN | Enable/disable control | Logic-compatible input: <0.4V disables regulator and engages 60Ω discharge path; >1.5V enables operation. |
| NC | No connect | Pin 5 is internally unconnected in fixed-output variants; must remain floating or grounded per layout best practice. |
Key Features
| Feature | Design Value |
|---|---|
| Low-noise regulation | 60µVrms output noise enables clean power for high-resolution SAR ADCs and low-phase-noise VCOs. |
| Ultra-low standby current | 0.1µA shutdown current allows multi-year battery operation in IoT endpoint sensors. |
| Ceramic capacitor compatible | Stable with ≥1µF X5R/X7R ceramics on input and output-eliminates need for costly tantalum or electrolytic caps. |
| Integrated soft-start | 50µs controlled ramp prevents inrush-induced voltage droop on shared supply rails during power-up. |
| VOUT auto-discharge | 60Ω internal MOSFET discharges output within milliseconds after shutdown-critical for fast system reset sequencing. |
Applications
| Portable Medical Sensors | Notebook CPU Core Bias |
|---|---|
Use Scenario: Powering low-power ECG front-end amplifiers and 16-bit sigma-delta ADCs in wearable patches. IC Role / Device Role / Timing Role: Provides ultra-low-noise 1.5V reference rail decoupled from noisy digital subsystems. Use Value: 60µVrms noise and 68dB PSRR prevent baseline wander and harmonic distortion in sub-µV biomedical signals. |
Use Scenario: Supplying auxiliary 1.5V bias to DDR memory termination or GPU voltage-tracking circuits. IC Role / Device Role / Timing Role: Delivers tightly regulated, fast-transient-capable voltage independent of main VRM load dynamics. Use Value: 0.6%/A load regulation and 50µs soft-start ensure stable memory interface timing during burst-mode access. |
| Industrial PLC I/O Modules | Wireless Sensor Node RF Subsystem |
Use Scenario: Powering isolated analog input channel signal conditioning (op-amps, references) in DIN-rail controllers. IC Role / Device Role / Timing Role: Supplies clean, thermally robust 1.5V rail across -40°C to +85°C industrial ambient range. Use Value: ±100 ppm/°C temperature coefficient and 165°C thermal shutdown maintain accuracy and safety in uncooled enclosures. |
Use Scenario: Regulating 1.5V for BLE/Wi-Fi transceiver RF synthesizers and LNA bias in battery-powered nodes. IC Role / Device Role / Timing Role: Low-quiescent-current LDO supporting intermittent transmit/receive duty cycles. Use Value: 60µA operating IQ and 0.1µA shutdown IQ extend coin-cell lifetime beyond 5 years in 1% duty-cycle deployments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Torex XC6206P152MR | Same 1.5V fixed output, but 150mA max output current and higher 250mV dropout at 100mA. | Limited to lower-current analog rails; unsuitable for 300mA peak loads like burst-mode transceivers. | Select when board space is constrained (SOT-23-3) and load current remains ≤150mA. |
| Richtek RT9193-15GB | 1.5V output, 300mA rating, but higher 75µA quiescent current and no integrated VOUT discharge MOSFET. | Requires external discharge circuit for fast reset; less optimal for systems needing autonomous power-down sequencing. | Choose if PSRR (70dB @ 1kHz) is prioritized over discharge functionality and standby IQ. |
Compared with XC6206P152MR and RT9193-15GB, the AP2128K-1.5TRG1 uniquely combines 300mA capability, 60µA IQ, integrated 60Ω discharge, and 60µVrms noise-making it the only option meeting full spec for high-accuracy, battery-constrained, fast-sequencing applications.
Availability
AP2128K-1.5TRG1 is available at Aetrix Electronics and suitable for notebook computers, industrial PLC I/O modules, portable medical sensors, and wireless sensor node RF subsystems requiring stable component supply with guaranteed long-term sourcing.
Supply support for AP2128K-1.5TRG1 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
BCD Semiconductor Manufacturing Limited is a Shanghai-based fabless analog IC designer specializing in high-performance power management, LED drivers, and mixed-signal solutions for consumer, industrial, and computing markets.
The AP2128 series targets ultra-low-noise, low-IQ LDO applications in battery-powered and space-constrained systems-emphasizing CMOS process advantages for precision, efficiency, and ceramic capacitor compatibility.
FAQ
What is the minimum input voltage required for AP2128K-1.5TRG1 to regulate at full 300mA load?
The AP2128K-1.5TRG1 requires VIN ≥ 2.5V to maintain regulation. At 300mA output, its dropout is 900–1000mV, so minimum functional input is 2.4V (1.5V + 0.9V). However, per datasheet absolute minimum is 2.5V to guarantee performance across temperature and process variation.
Can AP2128K-1.5TRG1 be used with 0.47µF output capacitors instead of the recommended 1µF?
No. The device is characterized and stabilized for ≥1µF ceramic output capacitance. Using 0.47µF risks phase margin degradation, leading to oscillation under load transients-verified in Figure 31–32 load transient waveforms where COUT = 1µF is mandatory.
Does the SHUTDOWN pin require a pull-up resistor when unused?
Yes. The SHUTDOWN pin has an internal 3MΩ pull-down resistor, but leaving it floating may cause erratic enable/disable behavior due to noise coupling. A 100kΩ pull-up to VIN is recommended for default-enable operation in noise-prone environments.
How does thermal shutdown hysteresis affect recovery after an overtemperature event?
When junction temperature reaches 165°C, the device shuts down. It remains off until temperature falls to 135°C (165°C − 30°C hysteresis), preventing rapid cycling during marginal thermal conditions and allowing safe cooldown before resuming regulation.
AP2128K-1.5TRG1 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):
- 1.5V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 1V @ 300mA
- Current - Output:
- 300mA
- Current - Quiescent (Iq):
- 90 µA
- Current - Supply (Max):
- -
- PSRR:
- 68dB ~ 54dB (100Hz ~ 10kHz)
- Control Features:
- Enable
- Protection Features:
- Over Current, Over Temperature
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
AP2128K-1.5TRG1 FAQ
1.How can I place an order for AP2128K-1.5TRG1 through Aetrix?
Please submit a Request for Quotation (RFQ) for AP2128K-1.5TRG1 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 AP2128K-1.5TRG1 reliable?
The price and inventory of AP2128K-1.5TRG1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP2128K-1.5TRG1 is usually 5 days.
3.What payment methods are accepted for AP2128K-1.5TRG1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP2128K-1.5TRG1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP2128K-1.5TRG1?
AP2128K-1.5TRG1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP2128K-1.5TRG1 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 AP2128K-1.5TRG1?
For technical support, including AP2128K-1.5TRG1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP2128K-1.5TRG1 requirements.
6.How does Aetrix verify that AP2128K-1.5TRG1 is sourced from the original manufacturer or authorized distributors?
All AP2128K-1.5TRG1 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 AP2128K-1.5TRG1 meets industry standards.
7.What is the process for return or replacement of AP2128K-1.5TRG1?
All AP2128K-1.5TRG1 units undergo pre-shipment inspection (PSI). If there is an issue with AP2128K-1.5TRG1, 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 AP2128K-1.5TRG1 part is unused and in its original packaging.
Return procedure for AP2128K-1.5TRG1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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