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Diodes Incorporated AP7343D-28FS4-7
- Part No.:
- AP7343D-28FS4-7
- Manufacturer:
- Diodes Incorporated
- Package:
- 4-XDFN Exposed Pad
- Datasheet:
-
AP7343D-28FS4-7.pdf
- Description:
- LDO CMOS LOWCURR X2-DFN1010-4 T&
- Quantity:
- Payment:
- Shipping:
Inventory:1,059
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Product details
Overview
AP7343D-28FS4-7 from Diodes Incorporated is a 300mA, 2.8V fixed-output low-dropout linear regulator with high PSRR (75dB at 1kHz), ultra-low output noise (60µVrms, 10Hz–100kHz), and ±1% output voltage accuracy over temperature. Built on CMOS process, it features enable control, thermal shutdown, short-circuit protection, and integrated auto-discharge functionality. It powers RF supplies and camera modules in space-constrained portable electronics.
For engineers reviewing the AP7343D-28FS4-7 datasheet, AP7343D-28FS4-7 pinout, AP7343D-28FS4-7 application, or AP7343D-28FS4-7 equivalent, key selection criteria include dropout voltage at 300mA (0.30V typ. for 2.8V output), quiescent current (35µA typ.), EN logic thresholds (0.5VIL/1.3VIH), and thermal resistance (237°C/W in X2-DFN1010-4).
Technical Context
The AP7343D-28FS4-7 integrates a precision voltage reference, error amplifier, current-limit circuit, and NMOS pass transistor with built-in discharge path. Its CMOS architecture enables low quiescent current and fast load transient response-demonstrated by <±15mV deviation under 1mA↔300mA step with 1µF COUT.
It operates across 1.7V–5.25V input range and delivers stable 2.8V output with ±1% accuracy at +25°C and ±30ppm/°C tempco. Thermal shutdown activates at +150°C with +20°C hysteresis, and short-circuit current is clamped to ~60mA.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 2.8V ±1% at +25°C; maintains regulation down to 1.7V input |
| Max Output Current | 300mA continuous; fold-back short-circuit limit ~60mA |
| Dropout Voltage | 0.30V typical at 300mA (2.8V output), enabling operation with VIN as low as 3.1V |
| PSRR | 75dB at 1kHz; suppresses ripple from noisy DC-DC stages feeding RF/camera rails |
| Output Noise | 60µVrms (10Hz–100kHz); critical for low-phase-noise VCOs and image sensor analog chains |
| Quiescent Current | 35µA typical; supports >1-year battery life in always-on sensor nodes |
| Enable Thresholds | VEN(HI) ≥1.3V, VEN(LO) ≤0.5V; compatible with 1.8V/3.3V GPIO without level shift |
Pinout & Package
AP7343D-28FS4-7 uses the X2-DFN1010-4 (Type B) package: 1.0mm × 1.0mm, 0.4mm pitch, 4-terminal surface-mount with exposed thermal pad (EP). The EP must be connected to GND via large copper area for optimal thermal performance (RθJB = 85.7°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VOUT (Pin 1) | Regulated power output | Delivers 2.8V ±1% to load; requires 1µF ceramic capacitor placed adjacent to pin for stability |
| GND (Pin 2) | Power ground reference | Return path for load current and internal circuits; must connect directly to low-impedance PCB ground plane |
| EN (Pin 3) | Active-high enable control | Pulling ≥1.3V enables regulator; ≤0.5V disables it and activates auto-discharge (30Ω path to GND) |
| VIN (Pin 4) | Unregulated input supply | Accepts 1.7V–5.25V; requires 0.47µF ceramic decoupling capacitor placed within 2mm of pin |
| EP (Exposed Pad) | Thermal dissipation node | Not electrically functional; soldered to GND copper pour to reduce RθJA from 237°C/W to ~120°C/W in typical layout |
Key Features
| Feature | Design Value |
|---|---|
| Auto-discharge function | 30Ω internal NMOS discharge path from VOUT to GND when EN = low, clearing residual charge in <1ms |
| High PSRR at 1kHz | 75dB attenuation enables clean 2.8V rail even when sourced from switching converter with 1kHz ripple |
| Ultra-low noise output | 60µVrms noise floor preserves SNR in camera ISP analog front-ends and RF LNA biasing |
| Low dropout at full load | 0.30V dropout at 300mA allows use with single-cell Li-ion (3.0V min) or buck-boost outputs |
| Thermal protection | +150°C shutdown with +20°C hysteresis prevents damage during sustained overload or poor heatsinking |
Applications
| RF Power Amplifier Bias | CMOS Image Sensor Core Supply |
|---|---|
|
Use Scenario: Providing stable 2.8V bias to GaAs pHEMT power amplifiers in 4G/5G mobile front-ends. IC Role / Device Role / Timing Role: Low-noise LDO delivering clean DC bias; no timing function. Use Value: 60µVrms noise and 75dB PSRR prevent AM-to-PM distortion and EVM degradation in transmit chain. |
Use Scenario: Powering analog core (ADC, PLL, pixel array) of high-resolution smartphone image sensors. IC Role / Device Role / Timing Role: Precision voltage regulator ensuring consistent analog performance across temperature and load. Use Value: ±1% output accuracy and ±30ppm/°C tempco maintain ADC reference stability and reduce image banding artifacts. |
| Portable Media Player Audio Codec | Wireless Adapter Baseband IC |
|
Use Scenario: Supplying 2.8V to stereo audio DAC/ADC and headphone driver in Bluetooth headphones. IC Role / Device Role / Timing Role: Low-quiescent-current LDO minimizing battery drain during playback and standby. Use Value: 35µA IQ extends battery runtime; 0.30V dropout enables operation down to 3.1V input from single Li-ion cell. |
Use Scenario: Regulating 2.8V for Wi-Fi/BT baseband SoCs in compact IoT modules with tight thermal constraints. IC Role / Device Role / Timing Role: Enable-controlled power rail supporting deep-sleep wake-up sequences. Use Value: Fast EN turn-on (<100µs) and auto-discharge ensure reliable reset sequencing and eliminate floating VOUT during sleep. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AP7361D-28SAG-7 | Same 2.8V output, but 600mA rated; higher RDS(ON) → 0.45V dropout at 300mA; no auto-discharge | Better suited for higher-current digital rails; lacks discharge for analog reset compliance | Select when >300mA peak load occurs or discharge not required; larger SOT25 footprint |
| MCP1826-2802E/DB | 2.8V ±2% accuracy; 500mA; 65dB PSRR @1kHz; 45µVrms noise; no auto-discharge; 1.7–6.0V input | Slightly lower PSRR/noise; wider input range; RoHS-compliant but not halogen-free | Choose for cost-sensitive industrial designs where ±2% accuracy and no discharge are acceptable |
Compared with AP7343D-28FS4-7, AP7361D-28SAG-7 trades lower dropout for higher current capability and no discharge, while MCP1826-2802E/DB offers broader input range but sacrifices noise/PSRR performance and environmental compliance.
Availability
AP7343D-28FS4-7 is available at Aetrix Electronics and suitable for RF power amplifier biasing, CMOS image sensor core supplies, portable media player audio codecs, and wireless adapter baseband ICs requiring stable component supply, automotive-grade reliability, and lead-free/Green compliance.
Supply support for AP7343D-28FS4-7 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 consumer, computing, communications, industrial, and automotive markets.
The AP7343 series targets low-power portable electronics, delivering high PSRR, ultra-low noise, and miniature packaging for space- and battery-constrained applications like smartphones and wearables.
FAQ
What is the minimum input voltage required for AP7343D-28FS4-7 to regulate 2.8V at 300mA?
The minimum input voltage is determined by dropout: 2.8V + 0.30V = 3.1V typical. At worst-case 0.39V dropout (per datasheet, 2.1V < VOUT ≤ 2.5V bin), VIN must be ≥3.19V. The device remains functional down to 1.7V input but cannot regulate 2.8V below ~3.1V.
Does AP7343D-28FS4-7 require an external discharge resistor?
No. The "D" suffix indicates built-in auto-discharge: when EN is pulled low, an internal 30Ω NMOS connects VOUT to GND, discharging output capacitance in under 1ms. No external components are needed for controlled power-down sequencing.
Can AP7343D-28FS4-7 be used with ceramic output capacitors smaller than 1µF?
Yes-the device is stable with ≥0.47µF ceramic capacitors. However, 1µF is recommended for optimal transient response under 300mA load steps. Lower values increase output voltage deviation during fast load changes, per load transient waveforms in the datasheet.
How does the exposed pad (EP) affect thermal performance in AP7343D-28FS4-7?
The EP reduces thermal resistance significantly: RθJA drops from 237°C/W (no EP connection) to ~120°C/W with a 25mm² GND copper pour. It must be soldered-not just plated-and tied to system GND; using it as sole GND electrode violates design guidelines and degrades reliability.
AP7343D-28FS4-7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- *
- Package/Case:
- 4-XDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 5.25V
- Voltage - Output (Min/Fixed):
- 2.8V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 0.3V @ 300mA
- Current - Output:
- 300mA
- Current - Quiescent (Iq):
- 60 µA
- Current - Supply (Max):
- -
- PSRR:
- 75dB (1kHz)
- Control Features:
- Current Limit, Enable
- Protection Features:
- Over Current, Over Temperature, Short Circuit
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- X2-DFN1010-4 (Type B)
AP7343D-28FS4-7 FAQ
1.How can I place an order for AP7343D-28FS4-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AP7343D-28FS4-7 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 AP7343D-28FS4-7 reliable?
The price and inventory of AP7343D-28FS4-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP7343D-28FS4-7 is usually 5 days.
3.What payment methods are accepted for AP7343D-28FS4-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP7343D-28FS4-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP7343D-28FS4-7?
AP7343D-28FS4-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP7343D-28FS4-7 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 AP7343D-28FS4-7?
For technical support, including AP7343D-28FS4-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP7343D-28FS4-7 requirements.
6.How does Aetrix verify that AP7343D-28FS4-7 is sourced from the original manufacturer or authorized distributors?
All AP7343D-28FS4-7 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 AP7343D-28FS4-7 meets industry standards.
7.What is the process for return or replacement of AP7343D-28FS4-7?
All AP7343D-28FS4-7 units undergo pre-shipment inspection (PSI). If there is an issue with AP7343D-28FS4-7, 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 AP7343D-28FS4-7 part is unused and in its original packaging.
Return procedure for AP7343D-28FS4-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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