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Diodes Incorporated AP7361-18FGE-7
- Part No.:
- AP7361-18FGE-7
- Manufacturer:
- Diodes Incorporated
- Package:
- 8-UDFN Exposed Pad
- Datasheet:
-
AP7361-18FGE-7.pdf
- Description:
- IC REG LINEAR 1.8V 1A 8UDFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,580
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Product details
Overview
AP7361-18FGE-7 from Diodes Incorporated is a 1A fixed-output (1.8V) ultra-low dropout linear regulator in U-DFN3030-8 package, featuring 70µA typical quiescent current, 500mV dropout at 1A load, and integrated enable control. It delivers stable power to FPGA I/O rails, portable audio subsystems, and battery-powered microcontroller peripherals where low thermal footprint and fast transient response are critical.
For engineers reviewing the AP7361-18FGE-7 datasheet, AP7361-18FGE-7 pinout, AP7361-18FGE-7 application, or AP7361-18FGE-7 equivalent, key selection criteria include dropout voltage at full load, thermal resistance (θJA = 70°C/W), EN logic thresholds (VIL ≤ 0.3V, VIH ≥ 1.0V), and ceramic capacitor stability with ≥2.2µF output capacitance.
Technical Context
The AP7361-18FGE-7 implements a PMOS pass transistor architecture enabling ultra-low dropout operation and high PSRR (65dB @ 1kHz). Its internal 0.8V bandgap reference feeds an error amplifier that regulates output by adjusting gate drive to maintain VOUT = 1.8V ±1% across -40°C to +85°C ambient.
Enable functionality is implemented via a dedicated EN pin (Pin 2) with active-high logic and <0.1µA leakage. Protection circuitry includes foldback current limiting (1.1–1.5A trip), short-circuit clamping (~200mA), and thermal shutdown with 20°C hysteresis (150°C trip, 130°C recovery).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.8V ±1% over temperature and line/load, enabling direct powering of 1.8V I/O domains without external resistors. |
| Max Output Current | 1.0A continuous - supports high-current digital loads such as FPGA banks or multi-core SoC peripherals. |
| Dropout Voltage | 500mV at 1A load - allows operation from 2.3V input (e.g., single Li-ion cell post-regulation) while maintaining regulation. |
| Quiescent Current | 70µA typical - minimizes standby power loss in always-on subsystems like real-time clocks or sensor interfaces. |
| PSRR | 65dB @ 1kHz - suppresses switching noise from upstream DC/DC converters feeding the LDO input. |
| Thermal Resistance | θJA = 70°C/W (U-DFN3030-8) - enables 1A operation up to +85°C ambient with minimal PCB copper area. |
| Stability | Stable with ≥2.2µF ceramic output capacitor (ESR 10–300mΩ) - eliminates need for electrolytic or tantalum capacitors. |
Pinout & Package
AP7361-18FGE-7 uses the U-DFN3030-8 (3.0mm × 3.0mm, 0.5mm pitch) thermally enhanced package with exposed thermal pad. Pin 4 is GND and serves as primary thermal path; Pin 8 is IN and requires ≥1µF ceramic decoupling adjacent to the pad.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OUT) | Regulated output | Delivers 1.8V to load; must connect ≥2.2µF ceramic capacitor directly between this pin and GND for stability. |
| 2 (EN) | Enable input | Active-high logic control: drives high (>1.0V) to enable output; pulls low (<0.3V) to shut down regulator and reduce IQ to 0.05µA. |
| 3 (ADJ/NC) | Adjust reference / No-connect | No-connect in fixed-output variant; left floating or tied to GND - not used for voltage setting. |
| 4 (GND) | Ground reference & thermal path | Primary return path and main thermal conduction node; must be soldered to large PCB ground plane with ≥4 thermal vias. |
| 5,6,7 (NC) | No connection | Internally unconnected; must remain unconnected on PCB to avoid parasitic coupling or mechanical stress. |
| 8 (IN) | Input supply | Accepts 2.2–6.0V; requires ≥1µF ceramic capacitor placed within 2mm of pin to suppress high-frequency noise and ensure stability. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low dropout | 500mV at 1A ensures usable headroom from 2.3V sources (e.g., partially discharged Li-ion or buck converter outputs). |
| Fast start-up time | 200µs typical enables rapid power sequencing in systems requiring synchronized rail activation (e.g., FPGA configuration). |
| High PSRR | 65dB @ 1kHz reduces ripple from noisy switchers, preserving signal integrity in analog/audio sections powered downstream. |
| Integrated protection | Current limit (1.1–1.5A), short-circuit clamp (~200mA), and thermal shutdown (150°C/130°C) eliminate need for external fault management circuitry. |
| Ceramic capacitor compatibility | Stable with ≥2.2µF X5R/X7R ceramics simplifies BOM, improves reliability vs. electrolytics, and reduces board space. |
Applications
| Portable Audio Codec Power | FPGA I/O Bank Supply |
|---|---|
|
Use Scenario: Powering stereo audio codec ICs (e.g., AK4490, CS43L22) in Bluetooth headphones with single-cell Li-ion input. IC Role / Device Role / Timing Role: Primary 1.8V analog/digital supply rail regulator with low noise and fast transient response to handle dynamic audio load steps. Use Value: 70µA quiescent current extends battery runtime; 65dB PSRR prevents audible switching noise from upstream DC/DC converter. |
Use Scenario: Delivering clean 1.8V to FPGA I/O banks interfacing with DDR3 memory or high-speed serial transceivers. IC Role / Device Role / Timing Role: Low-noise, low-dropout point-of-load regulator ensuring stable I/O voltage during simultaneous data bursts. Use Value: 200µs start-up supports FPGA configuration timing; 500mV dropout enables use with 2.5V intermediate bus, reducing heat dissipation. |
| Industrial Sensor Node MCU Core | USB-C PD Sink Controller Bias |
|
Use Scenario: Supplying 1.8V core voltage to ultra-low-power MCUs (e.g., STM32L4+, EFM32PG) in battery-operated wireless sensor nodes. IC Role / Device Role / Timing Role: Always-on LDO providing regulated core voltage during deep-sleep modes and wake-up transitions. Use Value: 70µA IQ minimizes sleep-mode current draw; thermal shutdown protects against enclosure overheating in sealed enclosures. |
Use Scenario: Biasing USB-C PD sink controller ICs (e.g., CYPD3171, FUSB302) requiring precise 1.8V logic supply independent of VBUS negotiation state. IC Role / Device Role / Timing Role: Enable-controlled auxiliary rail that powers PD controller only when system is awake and VBUS is present. Use Value: EN pin allows synchronous power gating with system state machine; 1.8V accuracy (±1%) ensures reliable logic-level signaling per USB PD spec. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar fixed-output LDO applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MCP1700-1802E/TO | 300mA max output, 170mV dropout at 250mA, θJA = 200°C/W (SOT-23), no enable pin. | Limited to low-current logic rails; unsuitable for FPGA I/O or audio codecs requiring >500mA. | Select only for cost-sensitive, sub-300mA applications where enable control and thermal performance are non-critical. |
| TPL7407LDR | 1.2A max output, 250mV dropout at 1A, 25µA IQ, but requires ≥4.7µF output capacitor and has lower PSRR (55dB @ 1kHz). | Better dropout and IQ, but higher output capacitance requirement increases BOM cost and board area. | Prefer when lowest possible IQ is mandatory and additional 2.5µF ceramic capacitance is acceptable. |
Compared with MCP1700-1802E/TO, AP7361-18FGE-7 delivers 3.3× higher current and integrated enable; versus TPL7407LDR, it trades 45µA higher IQ for 10dB better PSRR and relaxed capacitor requirements - favoring noise-sensitive audio or high-speed digital applications.
Availability
AP7361-18FGE-7 is available at Aetrix Electronics and suitable for FPGA power delivery, portable audio subsystems, and industrial sensor node designs requiring stable component supply with guaranteed long-term manufacturability and RoHS/Green compliance.
Supply support for AP7361-18FGE-7 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 manufacturer specializing in discrete, analog, and mixed-signal solutions for power management, signal integrity, and connectivity applications.
The AP7361 series belongs to Diodes' high-performance LDO portfolio designed for low-noise, low-dropout power delivery in portable, computing, and industrial systems where thermal efficiency and transient response are critical.
FAQ
What is the minimum input voltage required for AP7361-18FGE-7 to maintain regulation at 1A load?
The device requires VIN ≥ VOUT + VDROPOUT = 1.8V + 0.5V = 2.3V to sustain 1A output current while maintaining regulation. Below 2.3V, output voltage drops proportionally; the absolute minimum VIN is 2.2V, but usable current falls rapidly below 2.3V due to dropout constraints.
Can AP7361-18FGE-7 operate without an output capacitor?
No. The AP7361-18FGE-7 requires a minimum 2.2µF ceramic output capacitor (10–300mΩ ESR) for stability. Omitting it causes oscillation and potential damage. The capacitor must be placed within 3mm of OUT and GND pins using short, wide traces to minimize inductance.
Is the EN pin compatible with 1.8V logic levels?
Yes. With VIH(min) = 1.0V and VIL(max) = 0.3V, the EN pin reliably accepts standard 1.8V CMOS logic: a 1.8V high signal exceeds VIH by 0.8V margin, and a 0V low signal remains well below VIL. No level-shifting is needed for 1.8V GPIO interfaces.
How does thermal shutdown behave under sustained overload?
When junction temperature reaches ~150°C, the regulator disables output and enters thermal shutdown. It remains off until temperature falls to ~130°C (20°C hysteresis), then resumes regulation. Under continuous overload, this causes on/off cycling - visible as output voltage pulsing at ~1–10Hz depending on PCB thermal mass and airflow.
AP7361-18FGE-7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- 8-UDFN Exposed Pad
- 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 @ 1A
- Current - Output:
- 1A
- Current - Quiescent (Iq):
- 90 µA
- Current - Supply (Max):
- -
- PSRR:
- 65dB ~ 45dB (1kHz ~ 10kHz)
- Control Features:
- Enable
- Protection Features:
- Over Current, Over Temperature, Short Circuit
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- U-DFN3030-8 (Type E)
AP7361-18FGE-7 FAQ
1.How can I place an order for AP7361-18FGE-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AP7361-18FGE-7 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 AP7361-18FGE-7 reliable?
The price and inventory of AP7361-18FGE-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP7361-18FGE-7 is usually 5 days.
3.What payment methods are accepted for AP7361-18FGE-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP7361-18FGE-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP7361-18FGE-7?
AP7361-18FGE-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP7361-18FGE-7 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 AP7361-18FGE-7?
For technical support, including AP7361-18FGE-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP7361-18FGE-7 requirements.
6.How does Aetrix verify that AP7361-18FGE-7 is sourced from the original manufacturer or authorized distributors?
All AP7361-18FGE-7 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 AP7361-18FGE-7 meets industry standards.
7.What is the process for return or replacement of AP7361-18FGE-7?
All AP7361-18FGE-7 units undergo pre-shipment inspection (PSI). If there is an issue with AP7361-18FGE-7, 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 AP7361-18FGE-7 part is unused and in its original packaging.
Return procedure for AP7361-18FGE-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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