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Diodes Incorporated AP2112K-1.8TRG1
- Part No.:
- AP2112K-1.8TRG1
- Manufacturer:
- Diodes Incorporated
- Package:
- SC-74A, SOT-753
- Datasheet:
-
AP2112K-1.8TRG1.pdf
- Description:
- IC REG LINEAR 1.8V 600MA SOT25
- Quantity:
- Payment:
- Shipping:
Inventory:96,736
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Product details
Overview
AP2112K-1.8TRG1 from Diodes Incorporated is a fixed-output 1.8V, 600mA CMOS low-dropout linear regulator with enable control and auto-discharge functionality, delivering ±1.5% output accuracy, 250mV typical dropout at full load, and 50µVRMS output noise-designed for powering core logic rails in portable computing and display subsystems.
For engineers reviewing the AP2112K-1.8TRG1 datasheet, AP2112K-1.8TRG1 pinout, AP2112K-1.8TRG1 application, or AP2112K-1.8TRG1 equivalent, this page provides verified package mapping (SOT25), validated terminal roles, confirmed thermal shutdown behavior (+160°C), exact load regulation (0.2%/A), and real-world discharge resistance (60Ω) to support stable power rail design in space-constrained embedded systems.
Technical Context
The AP2112K-1.8TRG1 implements a CMOS-based LDO architecture with internal voltage reference, error amplifier, and pass transistor, optimized for fast transient response to line and load changes. Its enable input controls both regulator activation and automatic VOUT discharge via an integrated 60Ω pull-down path when disabled.
It operates across 2.8V–6.0V input range with guaranteed 600mA output current at 1.8V, supports ceramic/tantalum/aluminum electrolytic output capacitors ≥1.0µF, and features foldback short-circuit protection limiting fault current to 50mA while maintaining thermal shutdown at +160°C with +25°C hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.8V ±1.5% - ensures stable core supply for 1.8V I/O or processor domains without external feedback. |
| Max Output Current | 600mA minimum - sufficient to power multiple low-power logic ICs or memory interfaces simultaneously. |
| Dropout Voltage | 250mV typical @600mA - enables operation from 2.8V input (e.g., single Li-ion cell with boost or buck-boost pre-regulation). |
| Quiescent Current | 55µA typical - minimizes standby power loss in always-on system management circuits. |
| PSRR | −65dB @100Hz/1kHz - suppresses ripple from noisy switching supplies upstream of the LDO. |
| Output Noise | 50µVRMS (10Hz–100kHz) - suitable for noise-sensitive analog circuitry like ADC references or RF bias rails. |
| Enable Threshold | VIL ≤ 0.4V, VIH ≥ 1.5V - compatible with standard 1.8V/3.3V GPIO logic levels without level-shifting. |
| Discharge Resistance | 60Ω when EN = low - actively discharges output capacitance within milliseconds, preventing floating or latch-up in sequenced power systems. |
Pinout & Package
SOT25 (also referenced as SOT-23-5) surface-mount package with 5 terminals, footprint compliant with IPC-7351A standard; thermal resistance θJA = 184°C/W (no heatsink), θJC = 96°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (VOUT) | Regulated output | Delivers stable 1.8V to load; requires ≥1.0µF ceramic capacitor for stability. |
| 2 (NC) | No connection | Internally unconnected; must remain floating or grounded per layout best practice-no routing required. |
| 3 (EN) | Enable control input | Active-high logic: ≥1.5V enables regulation; ≤0.4V disables output and activates 60Ω discharge path. |
| 4 (GND) | Power ground | Common return for input, output, and internal circuitry; requires low-impedance PCB plane connection. |
| 5 (VIN) | Input supply | Accepts 2.8V–6.0V DC; requires ≥1.0µF ceramic decoupling close to pin. |
Key Features
| Feature | Design Value |
|---|---|
| Auto-discharge on disable | 60Ω internal pull-down to GND ensures rapid VOUT collapse (<1ms for 10µF), critical for safe power sequencing. |
| Low-noise regulation | 50µVRMS output noise enables clean supply for precision analog blocks without additional filtering. |
| Foldback short-circuit protection | Limits fault current to 50mA during output short, preventing thermal runaway and enabling safe recovery. |
| Wide input voltage range | 2.8V–6.0V operation supports direct use from single-cell Li-ion (with boost) or dual-cell alkaline sources. |
| Stable with flexible output caps | Works with 1.0µF ceramic, tantalum, or aluminum electrolytic-reduces BOM count and layout constraints. |
| Ultra-low standby current | 0.01µA typical ISTD preserves battery life in long-duration sleep modes of portable devices. |
Applications
| Portable Computing Power Rail | LCD Panel Logic Supply |
|---|---|
|
Use Scenario: Powers 1.8V I/O banks and auxiliary logic in ultrabook or tablet mainboards where space and efficiency are constrained. IC Role / Device Role / Timing Role: Primary post-regulator delivering clean, sequenced 1.8V to SoC peripherals and interface controllers. Use Value: 250mV dropout allows use of lower-input intermediate rails, reducing overall system power loss by up to 8% versus higher-dropout alternatives. |
Use Scenario: Supplies timing-critical LVDS transmitter logic and display controller I/O in industrial LCD modules. IC Role / Device Role / Timing Role: Low-noise, fast-transient LDO ensuring stable 1.8V for pixel clock distribution and data lane biasing. Use Value: −65dB PSRR at 1kHz rejects switching noise from adjacent DC-DC converters, eliminating visible banding artifacts on high-resolution panels. |
| USB-C Peripheral Power Management | Industrial Sensor Node Core Supply |
|
Use Scenario: Provides regulated 1.8V to USB-C controller, PD PHY, and sideband use (SBU) logic in docking stations. IC Role / Device Role / Timing Role: Enable-controlled LDO supporting hot-plug detection and dynamic power state transitions. Use Value: 0.01µA standby current extends quiescent runtime during cable-unplugged states without compromising wake latency. |
Use Scenario: Powers microcontroller core and ADC reference in battery-operated environmental sensor nodes deployed for >5-year field life. IC Role / Device Role / Timing Role: Primary voltage regulator for ultra-low-power MCU subsystem requiring precise 1.8V under varying temperature (−40°C to +85°C). Use Value: ±100ppm/°C tempco and ±1.5% initial accuracy maintain ADC measurement integrity across full operating range without calibration. |
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 | 300mA max output, 170mV dropout @100mA, no auto-discharge function | Limited to lighter loads; unsuitable where rapid VOUT discharge is required for sequencing | Select only if load current ≤300mA and discharge control is handled externally. |
| Torex XC6206P182MR-G | 500mA max output, 200mV dropout @100mA, 1.0µF min COUT, no enable pin | Fixed-on operation only; lacks enable control and discharge capability | Use only in always-on, non-sequenced applications with moderate current demand. |
Compared with MCP1700T-1802E/TT and XC6206P182MR-G, the AP2112K-1.8TRG1 uniquely combines 600mA capability, 250mV dropout at full load, and integrated 60Ω discharge-making it the only option among the three that satisfies simultaneous high-current, low-dropout, and controlled power-down requirements in compact portable designs.
Availability
AP2112K-1.8TRG1 is available at Aetrix Electronics and suitable for portable computing power rails, LCD panel logic supplies, USB-C peripheral management, and industrial sensor node core regulation requiring stable component supply, consistent parametric performance, and RoHS-compliant green packaging.
Supply support for AP2112K-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 industrial, computing, and consumer markets.
The AP2112 series belongs to Diodes' precision LDO portfolio, engineered specifically for space-constrained, battery-powered applications demanding tight output tolerance, ultra-low quiescent current, and robust transient response under variable load conditions.
FAQ
What is the minimum input voltage required for AP2112K-1.8TRG1 to regulate at full 600mA?
The AP2112K-1.8TRG1 requires VIN ≥ 2.8V to maintain regulation at 600mA output, based on its 250mV typical dropout voltage (1.8V + 0.25V = 2.05V minimum theoretical, but datasheet specifies 2.8V as absolute minimum operating condition). Below 2.8V, output collapses or enters dropout mode with increasing load-dependent droop.
Does AP2112K-1.8TRG1 require an external pull-up resistor on the EN pin?
No external pull-up is required: the AP2112K-1.8TRG1 integrates a 3.0MΩ internal EN pull-down resistor, ensuring default-off behavior at power-up. An external pull-up is only needed if system-level logic mandates active-high enable with guaranteed startup timing-otherwise, direct GPIO drive suffices.
Can AP2112K-1.8TRG1 be used with a 2.2µF X5R ceramic output capacitor?
Yes-AP2112K-1.8TRG1 is stable with 1.0µF or larger ceramic, tantalum, or aluminum electrolytic output capacitors. A 2.2µF X5R ceramic improves transient response margin and reduces output impedance across frequency, provided ESR remains <10mΩ and layout minimizes parasitic inductance.
How does the auto-discharge function behave during thermal shutdown?
During thermal shutdown, the AP2112K-1.8TRG1 disables regulation and activates the 60Ω VOUT-to-GND discharge path regardless of EN state. This ensures safe output collapse even under fault conditions, preventing latch-up or back-powering of upstream circuitry during overtemperature events.
AP2112K-1.8TRG1 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):
- 1.8V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 0.7V @ 600mA
- Current - Output:
- 600mA
- Current - Quiescent (Iq):
- 80 µA
- Current - Supply (Max):
- -
- PSRR:
- 65sB (100Hz ~ 1KHz)
- 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-25
AP2112K-1.8TRG1 FAQ
1.How can I place an order for AP2112K-1.8TRG1 through Aetrix?
Please submit a Request for Quotation (RFQ) for AP2112K-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 AP2112K-1.8TRG1 reliable?
The price and inventory of AP2112K-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 AP2112K-1.8TRG1 is usually 5 days.
3.What payment methods are accepted for AP2112K-1.8TRG1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP2112K-1.8TRG1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP2112K-1.8TRG1?
AP2112K-1.8TRG1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP2112K-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 AP2112K-1.8TRG1?
For technical support, including AP2112K-1.8TRG1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP2112K-1.8TRG1 requirements.
6.How does Aetrix verify that AP2112K-1.8TRG1 is sourced from the original manufacturer or authorized distributors?
All AP2112K-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 AP2112K-1.8TRG1 meets industry standards.
7.What is the process for return or replacement of AP2112K-1.8TRG1?
All AP2112K-1.8TRG1 units undergo pre-shipment inspection (PSI). If there is an issue with AP2112K-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 AP2112K-1.8TRG1 part is unused and in its original packaging.
Return procedure for AP2112K-1.8TRG1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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