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Diodes Incorporated AP2112R5A-1.8TRG1
- Part No.:
- AP2112R5A-1.8TRG1
- Manufacturer:
- Diodes Incorporated
- Package:
- SOT-89-5/6
- Datasheet:
-
AP2112R5A-1.8TRG1.pdf
- Description:
- IC REG LINEAR 1.8V 600MA SOT89-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,446
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Product details
Overview
AP2112R5A-1.8TRG1 from Diodes Incorporated is a 600mA CMOS low-dropout linear regulator with enable function and fixed 1.8V output, ±1.5% accuracy, 250mV typical dropout at 600mA, and auto-discharge via 60Ω internal resistor when disabled. It delivers stable power to core logic rails in space-constrained portable electronics requiring fast transient response and ultra-low quiescent current.
For engineers reviewing the AP2112R5A-1.8TRG1 datasheet, AP2112R5A-1.8TRG1 pinout, AP2112R5A-1.8TRG1 application, or AP2112R5A-1.8TRG1 equivalent, key selection criteria include guaranteed 600mA load capability, 55µA typical quiescent current, 60Ω VOUT discharge path, SOT89-5 (R5A) package thermal resistance of 47°C/W, and compatibility with 1.0µF ceramic, tantalum, or aluminum electrolytic output capacitors.
Technical Context
The AP2112R5A-1.8TRG1 integrates a precision voltage reference, error amplifier, pass transistor, and enable-controlled shutdown logic. Its CMOS architecture enables low dropout (250mV @ 600mA for 1.8V output), fast loop response for line/load transients, and foldback short-circuit protection limiting output current to 50mA under fault conditions.
Thermal shutdown activates at +160°C with +25°C hysteresis, and the EN pin provides active-high control (VIH ≥ 1.5V, VIL ≤ 0.4V). The device operates across –40°C to +85°C ambient, supports input voltages from 2.8V to 6.0V, and maintains 0.02%/V line regulation and 0.2%/A load regulation.
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 logic domains without external feedback. |
| Max Output Current | 600mA minimum - supports moderate-power microcontrollers, FPGAs, and interface ICs in compact designs. |
| Dropout Voltage | 250mV typical @ 600mA - enables operation from 2.8V input while maintaining 1.8V output, critical for battery-powered systems. |
| Quiescent Current | 55µA typical - minimizes standby power loss in always-on subsystems like real-time clocks or sensor interfaces. |
| VOUT Discharge | 60Ω internal resistor activated on disable - rapidly discharges output capacitance to prevent floating or latch-up in sequenced power systems. |
| PSRR | –65dB @ 100Hz/1kHz - suppresses ripple from noisy DC-DC stages upstream, preserving analog/RF signal integrity. |
| Operating Temp | –40°C to +85°C - qualified for industrial and consumer portable equipment environments without derating. |
Pinout & Package
SOT89-5 (R5A) package: 5-pin thermally enhanced surface-mount outline with exposed pad for improved heat dissipation (θJC = 47°C/W). Pin 1 = VOUT, Pin 2 = VIN, Pin 3 = EN, Pin 4 = GND, Pin 5 = NC (no connection).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | VOUT | Regulated 1.8V output - connects directly to load; requires 1.0µF ceramic capacitor for stability. |
| 2 | VIN | Input supply (2.8V–6.0V) - must be filtered; reverse-polarity protected by internal structure. |
| 3 | EN | Active-high enable - logic high (≥1.5V) enables regulation; logic low (≤0.4V) disables output and engages 60Ω discharge path. |
| 4 | GND | Power ground - shared reference for VIN, VOUT, and EN; requires low-impedance PCB return path. |
| 5 | NC | No connection - electrically isolated; must not be bonded or soldered to PCB trace or plane. |
Key Features
| Feature | Design Value |
|---|---|
| Auto-discharge function | 60Ω internal pull-down on VOUT during disable - eliminates need for external bleed resistor in power sequencing designs. |
| Stable with 1.0µF output cap | Compatible with ceramic, tantalum, and aluminum electrolytic types - reduces BOM count and board area vs. larger-capacitance LDOs. |
| Foldback short-circuit protection | 50mA current limit - prevents thermal runaway during sustained output shorts while enabling safe auto-recovery. |
| Low noise & high PSRR | 50µVRMS output noise and –65dB PSRR at 100Hz/1kHz - suitable for powering ADCs, PLLs, and RF front-ends. |
| Wide input voltage range | 2.8V to 6.0V operation - accommodates single-cell Li-ion (3.0–4.2V), dual-cell alkaline (2.4–3.2V), and 3.3V/5V rail inputs. |
Applications
| Portable DVD Player Power Rail | LCD Monitor Logic Supply |
|---|---|
|
Use Scenario: Supplies 1.8V to video decoder ASIC and memory interface in battery-operated DVD players. IC Role / Device Role / Timing Role: Primary LDO delivering regulated core voltage with fast transient response to handle burst-mode video decoding loads. Use Value: 250mV dropout enables >90% efficiency from 3.0V nominal battery; 55µA quiescent current extends playback time between charges. |
Use Scenario: Powers 1.8V I/O banks of timing controller (TCON) in 1080p LCD monitors. IC Role / Device Role / Timing Role: Low-noise post-regulator cleaning ripple from upstream DC-DC converter feeding display timing circuitry. Use Value: –65dB PSRR and 50µVRMS noise prevent visible artifacts (e.g., horizontal banding) in high-resolution static images. |
| Laptop Subsystem Core Supply | Industrial Handheld Terminal |
|
Use Scenario: Provides 1.8V to embedded microcontroller and USB PHY in laptop dock accessories. IC Role / Device Role / Timing Role: Enable-controlled LDO enabling clean power-up/down sequencing with host system BIOS. Use Value: 60Ω VOUT discharge ensures rapid voltage collapse (<1ms) for reliable reset assertion and avoids bus contention during hot-plug events. |
Use Scenario: Regulates 1.8V for ARM Cortex-M4 MCU and BLE radio in ruggedized handheld terminals. IC Role / Device Role / Timing Role: Industrial-grade LDO operating across –40°C to +85°C ambient with thermal shutdown and foldback protection. Use Value: 47°C/W θJC and SO-8-compatible thermal performance allow use in sealed enclosures without heatsinks or airflow. |
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/MB | 300mA max output, 1.8V fixed, 6µA IQ, SOT23-3 package | Limited to low-power sensors or RTCs; no EN pin or VOUT discharge | Select only for ultra-low-IQ battery monitoring where 600mA load is unnecessary. |
| Torex XC6219B182MR-G | 600mA max, 1.8V fixed, ±2% accuracy, 120mV dropout @ 300mA, SOT25 | Higher output tolerance and lower thermal performance (θJA = 184°C/W) | Prefer when footprint compatibility with SOT23-5 is mandatory and 47°C/W θJC is not required. |
Compared with MCP1700T-1802E/MB and XC6219B182MR-G, the AP2112R5A-1.8TRG1 uniquely combines 600mA capability, 60Ω auto-discharge, and 47°C/W thermal resistance in the R5A variant-enabling robust, sequenced power delivery in thermally constrained portable designs where both current capacity and controlled shutdown matter.
Availability
AP2112R5A-1.8TRG1 is available at Aetrix Electronics and suitable for portable DVD players, LCD monitor TCON supplies, laptop dock subsystems, and industrial handheld terminals requiring stable component supply with full RoHS/Green compliance and traceable sourcing.
Supply support for AP2112R5A-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 portable electronics needing low dropout, fast transient response, and integrated enable/discharge functionality without external components.
FAQ
What is the minimum input voltage required for AP2112R5A-1.8TRG1 to maintain regulation at 600mA?
The datasheet specifies a recommended minimum input voltage of 2.8V for the 1.8V version. At 600mA load, the 250mV typical dropout voltage means VIN must be ≥2.05V theoretically-but Diodes guarantees regulation only down to 2.8V to ensure stability, PSRR, and load regulation specs across temperature and process variation.
Does AP2112R5A-1.8TRG1 require an external pull-down resistor on the EN pin?
No. The EN pin includes an internal 3.0MΩ pull-down resistor, ensuring reliable disable state when left unconnected. External pull-down is unnecessary unless faster turn-off timing or noise immunity in high-EMI environments is required-then a 100kΩ resistor may be added.
Can AP2112R5A-1.8TRG1 be used with a 2.2µF ceramic output capacitor instead of 1.0µF?
Yes. The device is stable with 1.0µF to 10µF ceramic capacitors (X5R/X7R dielectric recommended). A 2.2µF capacitor improves load transient response and reduces output ripple further but does not affect minimum stability requirements.
Is the NC pin (Pin 5) in the SOT89-5 (R5A) package internally connected or floating?
Pin 5 is explicitly designated "NC" (No Connection) in the datasheet pin description table and functional block diagram. It is electrically isolated from all internal circuits and must remain unconnected on the PCB to avoid unintended coupling or thermal stress.
AP2112R5A-1.8TRG1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- SOT-89-5/6
- 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-89-5
AP2112R5A-1.8TRG1 FAQ
1.How can I place an order for AP2112R5A-1.8TRG1 through Aetrix?
Please submit a Request for Quotation (RFQ) for AP2112R5A-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 AP2112R5A-1.8TRG1 reliable?
The price and inventory of AP2112R5A-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 AP2112R5A-1.8TRG1 is usually 5 days.
3.What payment methods are accepted for AP2112R5A-1.8TRG1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP2112R5A-1.8TRG1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP2112R5A-1.8TRG1?
AP2112R5A-1.8TRG1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP2112R5A-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 AP2112R5A-1.8TRG1?
For technical support, including AP2112R5A-1.8TRG1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP2112R5A-1.8TRG1 requirements.
6.How does Aetrix verify that AP2112R5A-1.8TRG1 is sourced from the original manufacturer or authorized distributors?
All AP2112R5A-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 AP2112R5A-1.8TRG1 meets industry standards.
7.What is the process for return or replacement of AP2112R5A-1.8TRG1?
All AP2112R5A-1.8TRG1 units undergo pre-shipment inspection (PSI). If there is an issue with AP2112R5A-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 AP2112R5A-1.8TRG1 part is unused and in its original packaging.
Return procedure for AP2112R5A-1.8TRG1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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