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Diodes Incorporated AP2122AK-1.5TRE1
- Part No.:
- AP2122AK-1.5TRE1
- Manufacturer:
- Diodes Incorporated
- Package:
- SC-74A, SOT-753
- Datasheet:
-
AP2122AK-1.5TRE1.pdf
- Description:
- IC REG LINEAR 1.5V 150MA SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,981
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Product details
Overview
AP2122AK-1.5TRE1 from Diodes Incorporated is a fixed-output 1.5V low-dropout linear regulator IC in SOT-23-5 package, delivering up to 150mA output current with 150mV typical dropout at 100mA, 30µVrms output noise (10Hz–100kHz), and ±2% output voltage accuracy. It serves as a precision power supply for noise-sensitive analog circuitry in portable battery-powered systems.
For engineers reviewing the AP2122AK-1.5TRE1 datasheet, AP2122AK-1.5TRE1 pinout, AP2122AK-1.5TRE1 application, or AP2122AK-1.5TRE1 equivalent, key selection criteria include ultra-low noise performance, active-high enable with internal pull-down, compatibility with 1µF ceramic output capacitors, and operation across –40°C to +85°C junction temperature.
Technical Context
The AP2122AK-1.5TRE1 integrates a CMOS-based error amplifier, precision voltage reference, and current-limit protection within a single die. Its architecture supports fast line and load transient response due to high PSRR (70dB at 10kHz) and low output impedance, enabling stable regulation under dynamic current demands.
It features an active-high chip enable (CE) input with built-in 5MΩ pull-down resistor, allowing controlled shutdown with standby current as low as 0.1µA. The device operates with input voltages from 2V to 6V and maintains regulation down to VIN – VOUT = 400mV at 150mA load.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.5V ±2% - ensures stable biasing for low-voltage logic and RF front-end circuitry |
| Max Output Current | 150mA continuous - sufficient for powering microcontroller cores, sensors, or audio codecs |
| Dropout Voltage | 400mV max at 150mA - enables operation from single-cell Li-ion or two-cell alkaline sources |
| RMS Output Noise | 30µVrms (10Hz–100kHz) - minimizes phase jitter in clocked analog signal chains |
| PSRR | 70dB at 10kHz - suppresses switching noise from upstream DC/DC converters |
| Quiescent Current | 25µA typical - extends battery life in always-on sensor nodes and wearables |
| Enable Threshold | CE "high" ≥1.5V - compatible with 1.8V/3.3V GPIO without level-shifting |
Pinout & Package
SOT-23-5 package: 2.9mm × 1.6mm × 1.1mm body, gull-wing leads, thermal pad not present, JEDEC MO-178AC compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - VOUT | Regulated output | Delivers filtered 1.5V to load; requires ≥1µF ceramic capacitor for stability |
| 2 - GND | Power ground | Reference return for internal error amplifier and external bypass caps |
| 3 - VIN | Input supply | Accepts 2V–6V unregulated input; must be decoupled with 1µF ceramic cap |
| 4 - CE | Enable control | Active-high logic input; internal 5MΩ pull-down ensures default-off state |
| 5 - NC | No connection | Unbonded die pad; must remain floating-no external connection permitted |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low noise regulation | 30µVrms output noise enables clean power for ADCs, DACs, and RF synthesizers |
| Low dropout with high current | 400mV dropout at 150mA allows efficient use of marginal input headroom |
| Fast transient response | Sub-20µs recovery from 10–90% load steps preserves signal integrity in burst-mode systems |
| Ceramic capacitor compatibility | Stable with 1µF output capacitance (ESR 0.01–100Ω) - eliminates need for tantalum or electrolytic caps |
| Integrated enable with pull-down | Built-in 5MΩ CE pull-down resistor simplifies power sequencing and reduces BOM count |
Applications
| Portable Audio Codec Power | Low-Power MCU Core Supply |
|---|---|
Use Scenario: Powering stereo audio codec ICs (e.g., AK4430, PCM3168) in Bluetooth headphones. IC Role / Device Role / Timing Role: Primary low-noise analog supply rail for DAC/ADC sections and PLL reference. Use Value: 30µVrms noise prevents audible hiss and preserves SNR >110dB in 24-bit audio paths. |
Use Scenario: Supplying core voltage (VDD_CORE) to ARM Cortex-M0+ microcontrollers in coin-cell IoT sensors. IC Role / Device Role / Timing Role: Regulated 1.5V source for processor core and embedded SRAM during active and sleep modes. Use Value: 25µA quiescent current and 0.1µA shutdown current extend 10-year battery life in maintenance-free deployments. |
| RF Front-End Biasing | Medical Sensor Signal Chain |
Use Scenario: Providing clean bias to GaAs FET LNAs and mixer ICs in sub-GHz ISM band transceivers. IC Role / Device Role / Timing Role: Low-phase-noise analog supply for RF amplification and frequency conversion stages. Use Value: 70dB PSRR at 10kHz rejects switching artifacts from PMU DC/DC converters, reducing EVM degradation. |
Use Scenario: Powering instrumentation amplifiers and sigma-delta ADCs in wearable ECG/PPG modules. IC Role / Device Role / Timing Role: Precision analog rail for biopotential acquisition circuits requiring <1µV offset drift. Use Value: ±2% output accuracy and ±150µV/°C tempco ensure calibrated measurement stability across body-worn temperature ranges. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AP7315-15SAG-7 | 1.5V fixed output, 300mA rating, 250mV dropout at 150mA, 45µVrms noise | Higher current capability but higher noise - suitable where load exceeds 150mA | Select when >150mA output or lower dropout is required; verify noise sensitivity in final design |
| MCP1700-1502E/TO | 1.5V fixed, 250mA, 600mV dropout at 250mA, 35µVrms noise, TO-92 package | Larger through-hole package, higher thermal resistance - limited to low-power, non-space-constrained layouts | Choose only for legacy through-hole assembly or prototyping; not recommended for new SMT designs |
Compared with AP7315-15SAG-7 and MCP1700-1502E/TO, the AP2122AK-1.5TRE1 offers the lowest noise (30µVrms) in the smallest footprint (SOT-23-5), making it optimal for space- and noise-critical portable electronics where 150mA suffices.
Availability
AP2122AK-1.5TRE1 is available at Aetrix Electronics and suitable for portable medical devices, battery-powered audio equipment, low-power wireless sensor nodes, and compact industrial controllers requiring stable component supply and long-term manufacturability.
Supply support for AP2122AK-1.5TRE1 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 ICs, with emphasis on power management, signal integrity, and connectivity solutions for industrial, consumer, and computing markets.
The AP2122 series belongs to Diodes' high-performance LDO portfolio, designed specifically for ultra-low-noise, low-quiescent-current regulation in space-constrained, battery-operated applications demanding precision analog performance.
FAQ
What is the minimum input voltage required for regulation at 150mA load?
The AP2122AK-1.5TRE1 requires VIN ≥ VOUT + VDROP = 1.5V + 0.4V = 1.9V to maintain regulation at 150mA. Per datasheet Section 4, the recommended minimum VIN is 2.0V to ensure margin across temperature and process variation.
Can this LDO operate with a 1µF ceramic output capacitor?
Yes - the AP2122AK-1.5TRE1 is explicitly characterized for stability with 1µF ceramic capacitors having ESR between 0.01Ω and 100Ω. No additional series resistance or external compensation is needed, per Typical Applications Circuit and Electrical Characteristics notes.
Is the NC pin electrically isolated or internally connected?
Pin 5 (NC) is a no-connect terminal with no internal bond wire or die connection. It must remain unconnected on PCB layout; soldering or routing to ground or any net may cause unpredictable behavior or damage due to potential internal parasitic coupling.
How does the CE pin behave during power-up if left floating?
The CE pin has a built-in 5MΩ pull-down resistor, ensuring it defaults to logic low (<0.25V) at power-up. This places the device in shutdown mode until a valid ≥1.5V enable signal is applied - preventing uncontrolled output activation during system boot.
AP2122AK-1.5TRE1 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):
- 0.6V @ 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-1.5TRE1 FAQ
1.How can I place an order for AP2122AK-1.5TRE1 through Aetrix?
Please submit a Request for Quotation (RFQ) for AP2122AK-1.5TRE1 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-1.5TRE1 reliable?
The price and inventory of AP2122AK-1.5TRE1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP2122AK-1.5TRE1 is usually 5 days.
3.What payment methods are accepted for AP2122AK-1.5TRE1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP2122AK-1.5TRE1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP2122AK-1.5TRE1?
AP2122AK-1.5TRE1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP2122AK-1.5TRE1 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-1.5TRE1?
For technical support, including AP2122AK-1.5TRE1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP2122AK-1.5TRE1 requirements.
6.How does Aetrix verify that AP2122AK-1.5TRE1 is sourced from the original manufacturer or authorized distributors?
All AP2122AK-1.5TRE1 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-1.5TRE1 meets industry standards.
7.What is the process for return or replacement of AP2122AK-1.5TRE1?
All AP2122AK-1.5TRE1 units undergo pre-shipment inspection (PSI). If there is an issue with AP2122AK-1.5TRE1, 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-1.5TRE1 part is unused and in its original packaging.
Return procedure for AP2122AK-1.5TRE1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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