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Diodes Incorporated AP7331-28SNG-7
- Part No.:
- AP7331-28SNG-7
- Manufacturer:
- Diodes Incorporated
- Package:
- 6-UDFN Exposed Pad
- Datasheet:
-
AP7331-28SNG-7.pdf
- Description:
- IC REG LIN 2.8V 300MA 6DFN2020
- Quantity:
- Payment:
- Shipping:
Inventory:1,551
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Product details
Overview
AP7331-28SNG-7 from Diodes Incorporated is a fixed-output 2.8V, 300mA low-dropout linear regulator in DFN2020-6 package, featuring 65μA quiescent current, 300mV typical dropout at full load, and fast 80μs startup. It integrates enable control, thermal shutdown, current limiting, and short-circuit protection-designed for battery-powered wireless LAN cards and portable computing systems.
For engineers reviewing the AP7331-28SNG-7 datasheet, AP7331-28SNG-7 pinout, AP7331-28SNG-7 application, or AP7331-28SNG-7 equivalent, key selection criteria include ultra-low IQ across 2–6V input range, stability with 1μF ceramic output capacitor, PSRR of 65dB at 100Hz, and guaranteed operation from –40°C to +85°C ambient.
Technical Context
The AP7331-28SNG-7 implements a PMOS pass transistor architecture enabling low dropout (300mV @ 300mA) and high PSRR (65dB @ 100Hz). Its internal 0.4V bandgap reference and error amplifier deliver ±2% output voltage accuracy over temperature and load.
Enable logic operates with VIH ≥ 1.4V and VIL ≤ 0.4V, supporting direct microcontroller GPIO control. Protection circuitry includes foldback current limiting (400–600mA), short-circuit clamping (~100mA), and thermal shutdown at 140°C with 15°C hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 2.8V ±2% over –40°C to +85°C, enabling direct replacement for 2.8V rail in USB peripherals and RF front-ends. |
| Max Output Current | 300mA continuous, sufficient to power single-core ARM Cortex-M0/M3 MCUs or Wi-Fi transceivers without external boost. |
| Quiescent Current | 65μA typical at full load, minimizing standby power loss in always-on IoT sensor nodes. |
| Dropout Voltage | 300mV typical at 300mA, allowing operation from 3.1V input (e.g., single Li-ion cell post-protection) while maintaining regulation. |
| PSRR | 65dB at 100Hz, suppressing ripple from noisy DC-DC converters feeding the LDO input in mixed-signal SoC designs. |
| Startup Time | 80μs typical, enabling rapid wake-up from deep sleep in Bluetooth LE devices without supply brownout. |
| Thermal Shutdown | Triggers at 140°C junction temperature with 15°C hysteresis, preventing permanent damage during sustained overload in compact PCB layouts. |
Pinout & Package
AP7331-28SNG-7 uses the DFN2020-6 (2.0mm × 2.0mm, 0.65mm pitch) package with wettable flank leads for automated optical inspection. Thermal pad on underside enhances power dissipation (θJA = 167°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN (Pin 3) | Input voltage supply | Accepts 2V–6V; requires ≥1μF ceramic bypass capacitor placed adjacent to pin for noise suppression and stability. |
| GND (Pin 2) | Power ground reference | Must be connected to low-impedance PCB ground plane; shares thermal pad for heat conduction. |
| EN (Pin 1) | Enable control input | Active-high logic interface; drives regulator ON when ≥1.4V, OFF when ≤0.4V; tie to IN if always-on operation required. |
| OUT (Pin 4) | Regulated output | Delivers stable 2.8V; requires ≥1μF X7R/X5R ceramic capacitor directly between OUT and GND for transient response and stability. |
| NC (Pins 5, 6) | No connection | Internally unconnected; must remain floating-no routing or soldering permitted per datasheet. |
Key Features
| Feature | Design Value |
|---|---|
| Low ESR capacitor compatibility | Stable with 1–4.7μF ceramic output capacitors (10–200mΩ ESR), eliminating need for costly tantalum or polymer types. |
| Fast load transient response | Minimal overshoot/undershoot during 1mA ↔ 300mA load steps, protecting sensitive RF ICs from voltage glitches. |
| Ultra-low shutdown current | 1μA max input leakage when EN = 0V, preserving battery charge in long-term storage modes. |
| Green packaging | RoHS-compliant, halogen-free molding compound (no Br, Sb), meeting IPC-1752A environmental reporting requirements. |
| Wide input range | Operates from 2V (e.g., discharged LiFePO₄) to 6V (unregulated wall adapter), simplifying multi-rail power architecture. |
Applications
| Wireless LAN Modules | USB-C Peripheral Power |
|---|---|
|
Use Scenario: Powering 2.8V RF transceiver and baseband IC in mini-PCIe Wi-Fi cards. IC Role / Device Role / Timing Role: Primary 2.8V LDO supplying clean, low-noise bias to WLAN chipset analog sections. Use Value: 65μA IQ extends battery runtime in portable access points; 65dB PSRR rejects switching noise from upstream DC-DC converter. |
Use Scenario: Generating 2.8V auxiliary rail for USB-C PD controller logic and Type-C port detection circuitry. IC Role / Device Role / Timing Role: Secondary regulated supply enabling fast enable/disable synchronized with USB enumeration sequence. Use Value: 80μs startup ensures immediate compliance with USB PD specification timing for VCONN/VBUS monitoring. |
| Industrial Sensor Nodes | Medical Wearables |
|
Use Scenario: Powering 2.8V ADC, low-power MCU, and BLE radio in battery-operated vibration sensors. IC Role / Device Role / Timing Role: Single-point regulation for mixed-signal signal chain requiring tight voltage tolerance and low noise floor. Use Value: ±2% output accuracy maintains ADC reference integrity; thermal shutdown prevents field failure in enclosed enclosures. |
Use Scenario: Supplying 2.8V to optical heart-rate monitor ASIC and OLED display driver in wrist-worn health trackers. IC Role / Device Role / Timing Role: Low-noise, low-IQ regulator enabling >7-day battery life with periodic sensor sampling. Use Value: 300mV dropout allows use of aging coin-cell batteries down to 3.1V; small DFN2020-6 footprint saves critical board area. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar low-quiescent-current LDO applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MCP1700-2802E/TO | 250mA max output, 1.6μA IQ (lower), SOT23-5 package, no enable pin | Lacks EN control and current limit; suitable only for always-on, ultra-low-power sensor nodes | Select when IQ < 2μA is mandatory and enable functionality is unnecessary. |
| Torex XC6206P282MR-G | 300mA, 12μA IQ, SOT23-5, no thermal shutdown or short-circuit protection | Higher risk of field failure under fault conditions; requires external protection circuitry | Choose only for cost-sensitive consumer products where reliability margins allow unprotected operation. |
Compared with MCP1700-2802E/TO and XC6206P282MR-G, AP7331-28SNG-7 uniquely balances ultra-low IQ (65μA), integrated protection (thermal/current/short), and enable control in a space-efficient DFN2020-6 package-making it optimal for industrial and medical portable designs demanding robustness and rapid power-state transitions.
Availability
AP7331-28SNG-7 is available at Aetrix Electronics and suitable for wireless LAN modules, USB-C peripheral power supplies, and industrial sensor nodes requiring stable component supply with full traceability and lifecycle management.
Supply support for AP7331-28SNG-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 manufacturer of discrete semiconductors and analog ICs, specializing in high-reliability power management, signal integrity, and protection solutions for industrial, computing, and communications markets.
The AP7331 series targets portable and battery-constrained applications requiring ultra-low quiescent current, fast transient response, and comprehensive fault protection-addressing design challenges in next-generation IoT edge nodes and compact wireless systems.
FAQ
What is the minimum input voltage required for AP7331-28SNG-7 to maintain 2.8V output at 300mA?
The device requires VIN ≥ VOUT + VDROP = 2.8V + 0.3V = 3.1V minimum under full load. At lighter loads, dropout decreases-e.g., 150mV at 150mA-allowing operation down to 2.95V input. Below 3.1V, output voltage will drop proportionally per the specified dropout curve.
Can AP7331-28SNG-7 be used without an output capacitor?
No. A minimum 1μF X7R/X5R ceramic capacitor is mandatory between OUT and GND for stability and transient response. Omitting it causes oscillation and potential damage. The datasheet explicitly states "The output capacitor is required to stabilize and help transient response for LDO."
How does the EN pin behave during power-up sequences?
The EN pin must rise above 1.4V (VIH) to activate regulation. If EN ramps slower than VIN, the device may enter undefined state until EN exceeds threshold. For reliable sequencing, drive EN from a dedicated supervisor or ensure EN reaches VIH before VIN stabilizes within operating range.
Is AP7331-28SNG-7 compatible with lead-free reflow profiles?
Yes. It is RoHS-compliant with lead-free finish and rated for standard JEDEC J-STD-020D reflow profiles (peak 260°C, 60 seconds max). The DFN2020-6 package's wettable flanks support automated optical inspection of solder joints after reflow.
AP7331-28SNG-7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- 6-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):
- 2.8V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 0.55V @ 300mA
- Current - Output:
- 300mA
- Current - Quiescent (Iq):
- 75 µA
- Current - Supply (Max):
- 85 µA
- PSRR:
- 65dB (100Hz)
- Control Features:
- Enable
- Protection Features:
- Over Current, Over Temperature
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- U-DFN2020-6
AP7331-28SNG-7 FAQ
1.How can I place an order for AP7331-28SNG-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AP7331-28SNG-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 AP7331-28SNG-7 reliable?
The price and inventory of AP7331-28SNG-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP7331-28SNG-7 is usually 5 days.
3.What payment methods are accepted for AP7331-28SNG-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP7331-28SNG-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP7331-28SNG-7?
AP7331-28SNG-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP7331-28SNG-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 AP7331-28SNG-7?
For technical support, including AP7331-28SNG-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP7331-28SNG-7 requirements.
6.How does Aetrix verify that AP7331-28SNG-7 is sourced from the original manufacturer or authorized distributors?
All AP7331-28SNG-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 AP7331-28SNG-7 meets industry standards.
7.What is the process for return or replacement of AP7331-28SNG-7?
All AP7331-28SNG-7 units undergo pre-shipment inspection (PSI). If there is an issue with AP7331-28SNG-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 AP7331-28SNG-7 part is unused and in its original packaging.
Return procedure for AP7331-28SNG-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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