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Diodes Incorporated AP7340D-31FS4-7
- Part No.:
- AP7340D-31FS4-7
- Manufacturer:
- Diodes Incorporated
- Package:
- 4-XDFN Exposed Pad
- Datasheet:
-
AP7340D-31FS4-7.pdf
- Description:
- IC REG LINEAR 3.1V 150MA 4DFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,411
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Product details
Overview
AP7340D-31FS4-7 from Diodes Incorporated is a 3.1V fixed-output, 150mA low-dropout linear regulator with ±1% output voltage accuracy, 75dB PSRR at 1kHz, 60µVRMS output noise (10Hz–100kHz), and 35µA quiescent current - designed for RF supply and portable media player power rails where low noise and high PSRR are critical.
For engineers reviewing the AP7340D-31FS4-7 datasheet, AP7340D-31FS4-7 pinout, AP7340D-31FS4-7 application, or AP7340D-31FS4-7 equivalent, this LDO delivers stable 3.1V biasing for sensitive analog/RF circuitry in space-constrained handheld devices while supporting fast load transient response and enable-controlled power sequencing.
Technical Context
The AP7340D-31FS4-7 integrates a CMOS-based error amplifier, precision voltage reference, current-limit protection, and active discharge circuitry (EN = low discharges VOUT via 30Ω internal FET). Its architecture enables stable operation with only 0.47µF ceramic input/output capacitors.
It operates across 1.7V–5.25V input range, maintains ±1.5% output accuracy over –40°C to +85°C, and achieves 0.21V typical dropout at 150mA for 3.1V output - enabling efficient regulation from single-cell Li-ion or 3.3V system rails.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.1V ±1% at +25°C; ±1.5% over full temperature range - ensures stable bias for RF transceivers and camera sensors. |
| Max Output Current | 150mA guaranteed - sufficient for powering baseband processors, audio codecs, or Wi-Fi/BT modules in portable devices. |
| PSRR | 75dB at 1kHz - suppresses switching noise from adjacent DC-DC converters feeding noisy system rails. |
| Output Noise | 60µVRMS (10Hz–100kHz) - minimizes phase noise in local oscillator circuits and ADC reference paths. |
| Quiescent Current | 35µA typical - extends battery life in always-on sensor or standby communication subsystems. |
| Dropout Voltage | 0.21V typical at 150mA (3.1V output) - allows operation down to ~3.31V input, compatible with aging Li-ion cells. |
| Enable Threshold | VEN(HI) ≥1.3V, VEN(LO) ≤0.5V - compatible with 1.8V/3.3V GPIO control without level-shifting. |
| Thermal Package | X2-DFN1010-4 (1.0mm × 1.0mm, 0.4mm height) with thermal pad - supports >200mA power dissipation in compact PCB layouts. |
Pinout & Package
The AP7340D-31FS4-7 uses the X2-DFN1010-4 package: ultra-compact 1.0mm × 1.0mm footprint, 0.4mm profile, with exposed thermal pad optimized for PCB copper area connection to GND for thermal management.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PIN1: VOUT | Regulated power output | Delivers clean 3.1V to load; requires 0.47µF ceramic capacitor placed adjacent to minimize ESR-induced instability. |
| PIN2: GND | Power ground reference | Primary return path for output current; must connect directly to low-impedance ground plane to maintain PSRR and noise performance. |
| PIN3: EN | Active-high enable control | Drives regulator ON/OFF; floating state prohibited - tie to VIN or MCU GPIO; internal pull-down ensures safe shutdown on power-up. |
| PIN4: VIN | Unregulated input supply | Accepts 1.7V–5.25V; requires 0.47µF decoupling capacitor near pin to suppress supply rail transients and improve line rejection. |
| Thermal Pad | Thermal dissipation node | Exposed copper pad beneath package; must be soldered to ≥40mm² GND copper pour for optimal thermal resistance (<120°C/W junction-to-ambient). |
Key Features
| Feature | Design Value |
|---|---|
| Integrated active discharge | 30Ω internal FET pulls VOUT to GND when EN = low - prevents residual voltage hold-up in multi-rail systems requiring strict power sequencing. |
| Ultra-low noise output | 60µVRMS (10Hz–100kHz) - eliminates need for external RC filtering in RF front-end and high-resolution ADC reference supplies. |
| High PSRR at low frequency | 75dB at 1kHz - rejects ripple from buck converter switching frequencies and their harmonics without additional LC stages. |
| Wide input voltage range | 1.7V–5.25V - supports direct regulation from single Li-ion (2.7–4.2V), USB 3.3V, or boosted 5V rails. |
| Guaranteed 150mA output | Specified minimum current across full temperature and input range - enables reliable BOM sizing without derating for worst-case conditions. |
| Green, RoHS-compliant packaging | Lead-free, halogen-free, antimony-free X2-DFN1010-4 - meets IPC/JEDEC J-STD-020C reflow profiles and automotive AEC-Q200 stress requirements. |
Applications
| Smartphone RF Power | Portable Media Player Core Logic |
|---|---|
|
Use Scenario: Providing clean 3.1V bias to LTE/5G power amplifier driver stages and RF switch controllers. IC Role / Device Role / Timing Role: Low-noise post-regulator for RF signal chain; replaces noisier switching converters in final-stage biasing. Use Value: 60µVRMS noise and 75dB PSRR prevent AM-to-PM distortion and EVM degradation in transmit paths. |
Use Scenario: Supplying core logic voltage to ARM Cortex-M4 microcontrollers and NAND flash interfaces in handheld video players. IC Role / Device Role / Timing Role: Primary 3.1V system LDO; enables deterministic wake-up timing and low-power retention modes. Use Value: 35µA quiescent current extends playback time during pause states; ±1% accuracy ensures reliable memory interface timing margins. |
| Camera Sensor Bias | Wireless Adapter Baseband |
|
Use Scenario: Delivering stable 3.1V to CMOS image sensor analog front-end (AFE) and PLL clock generators. IC Role / Device Role / Timing Role: Precision analog supply rail; decouples sensor noise from digital SoC domains. Use Value: 0.21V dropout enables use with partially discharged batteries; ±1.5% accuracy maintains consistent pixel gain calibration. |
Use Scenario: Powering Bluetooth 5.0 and Wi-Fi 4/5 baseband ICs in USB dongles and IoT edge nodes. IC Role / Device Role / Timing Role: Enable-controlled auxiliary LDO; synchronizes power-up with host enumeration sequence. Use Value: Active discharge clears VOUT within 10µs of EN deassertion - prevents back-powering and bus contention during hot-plug events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar fixed-output LDO applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MCP1700-3102E/TO | 3.1V fixed, 250mA, 6µA IQ, but only 60dB PSRR at 1kHz and no active discharge. | Lacks RF-grade noise/PSRR performance; suitable for digital-only loads, not RF or sensor AFEs. | Select only if ultra-low IQ dominates over noise/PSRR requirements and discharge is handled externally. |
| Torex XC6210B312MR-G | 3.1V fixed, 150mA, 70dB PSRR at 1kHz, 40µVRMS noise, but no enable pin or discharge function. | Requires external enable circuitry; unsuitable for sequenced multi-rail systems needing controlled VOUT decay. | Prefer when board space allows discrete enable logic and discharge is unnecessary for system architecture. |
Compared with MCP1700-3102E/TO and XC6210B312MR-G, the AP7340D-31FS4-7 uniquely combines RF-grade PSRR/noise, integrated enable, and active discharge in a 1.0mm² footprint - making it the only drop-in solution for space-constrained, multi-rail portable designs requiring clean, controllable 3.1V bias.
Availability
AP7340D-31FS4-7 is available at Aetrix Electronics and suitable for smartphone RF power, portable media player core logic, camera sensor bias, and wireless adapter baseband applications requiring stable component supply, long-term lifecycle support, and traceable green sourcing.
Supply support for AP7340D-31FS4-7 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 company specializing in discrete, analog, and mixed-signal solutions for consumer, computing, communications, industrial, and automotive markets.
The AP7340 series belongs to Diodes' high-performance LDO portfolio, engineered specifically for noise-sensitive portable electronics requiring ultra-low quiescent current, high PSRR, and minimal footprint - with emphasis on RF, imaging, and battery-powered subsystems.
FAQ
What is the purpose of the thermal pad on the AP7340D-31FS4-7 package?
The exposed thermal pad beneath the X2-DFN1010-4 package serves as the primary heat dissipation path. It must be soldered to a ≥40mm² copper area connected to GND to achieve thermal resistance below 120°C/W. Leaving it unconnected or floating degrades power handling capability and risks thermal shutdown under 150mA load at elevated ambient temperatures.
Does the AP7340D-31FS4-7 require an external pull-up resistor on the EN pin?
No external pull-up is required. The AP7340D-31FS4-7 has an internal pull-down on EN, ensuring default shutdown at power-up. When driven by a microcontroller GPIO, EN can be directly connected - logic high ≥1.3V enables regulation, logic low ≤0.5V disables it and activates the 30Ω discharge FET. Floating EN is strictly prohibited per datasheet.
How does the active discharge feature behave during shutdown?
When EN is pulled low, the AP7340D-31FS4-7 activates an internal 30Ω NMOS FET between VOUT and GND, discharging the output capacitor. With a 10µF COUT, VOUT falls from 3.1V to <0.1V in <300µs. This prevents back-powering of upstream circuitry and ensures deterministic power-down sequencing in multi-rail systems.
Can the AP7340D-31FS4-7 operate with ceramic capacitors smaller than 0.47µF?
No. The datasheet specifies 0.47µF minimum for both CIN and COUT to ensure stability and transient response. Using smaller values risks oscillation or excessive output overshoot during load steps. For optimal performance, place 0.47µF X5R/X7R ceramics within 2mm of VIN–GND and VOUT–GND pins, using short, wide traces to minimize ESL and ESR.
AP7340D-31FS4-7 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):
- 3.1V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 0.27V @ 150mA
- Current - Output:
- 150mA
- Current - Quiescent (Iq):
- 50 µA
- Current - Supply (Max):
- 100 µA
- PSRR:
- 75dB (1kHz)
- Control Features:
- Enable
- Protection Features:
- Over Current
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- X2-DFN1010-4
AP7340D-31FS4-7 FAQ
1.How can I place an order for AP7340D-31FS4-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AP7340D-31FS4-7 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 AP7340D-31FS4-7 reliable?
The price and inventory of AP7340D-31FS4-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP7340D-31FS4-7 is usually 5 days.
3.What payment methods are accepted for AP7340D-31FS4-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP7340D-31FS4-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP7340D-31FS4-7?
AP7340D-31FS4-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP7340D-31FS4-7 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 AP7340D-31FS4-7?
For technical support, including AP7340D-31FS4-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP7340D-31FS4-7 requirements.
6.How does Aetrix verify that AP7340D-31FS4-7 is sourced from the original manufacturer or authorized distributors?
All AP7340D-31FS4-7 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 AP7340D-31FS4-7 meets industry standards.
7.What is the process for return or replacement of AP7340D-31FS4-7?
All AP7340D-31FS4-7 units undergo pre-shipment inspection (PSI). If there is an issue with AP7340D-31FS4-7, 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 AP7340D-31FS4-7 part is unused and in its original packaging.
Return procedure for AP7340D-31FS4-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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