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Diodes Incorporated AP7346D-1218FS6-7
- Part No.:
- AP7346D-1218FS6-7
- Manufacturer:
- Diodes Incorporated
- Package:
- 6-XFDFN Exposed Pad
- Datasheet:
-
AP7346D-1218FS6-7.pdf
- Description:
- IC REG LIN 1.2V/1.8V X2DFN1212-6
- Quantity:
- Payment:
- Shipping:
Inventory:7,347
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Product details
Overview
AP7346D-1218FS6-7 from Diodes Incorporated is a dual-channel, high-accuracy current-limiting low-dropout regulator in X2-DFN1212-6 package, delivering fixed 1.2V and 1.8V outputs with ±1% accuracy, 75dB PSRR at 1kHz, and 60µVrms output noise (10Hz–100kHz). It supports 1.7V–5.25V input, features independent enable pins (EN1/EN2), and targets power-sensitive RF and imaging subsystems in portable electronics.
For engineers reviewing the AP7346D-1218FS6-7 datasheet, AP7346D-1218FS6-7 pinout, AP7346D-1218FS6-7 application, or AP7346D-1218FS6-7 equivalent, key selection criteria include dual-rail voltage accuracy, channel-independent shutdown control, low-noise performance for analog/RF supplies, and thermal-limited 130mA per channel operation in ultra-compact DFN.
Technical Context
The AP7346D-1218FS6-7 integrates two independent CMOS-based LDO regulators sharing a single VIN and GND, each with dedicated EN and VOUT pins. Its architecture includes precision voltage references, error amplifiers, fold-back current limiting (132–182mA), and built-in auto-discharge circuitry via internal 50Ω N-channel FETs.
Each channel operates with ultra-low quiescent current (35µA typical per active channel, 0.1µA standby), achieves <0.39V dropout at 120mA for 1.8V output, and maintains stability with ≥0.47µF ceramic output capacitors-enabling compact, low-ESR PCB layouts for handheld devices.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltages | Fixed 1.2V (Channel 1) and 1.8V (Channel 2); eliminates external feedback resistors and reduces BOM count. |
| Output Accuracy | ±1% at +25°C, ±1.5% over −40°C to +85°C; ensures stable core/logic rail tolerance for SoC and sensor interfaces. |
| PSRR | 75dB at 1kHz; suppresses switching noise from adjacent DC-DC converters feeding RF or camera modules. |
| Output Noise | 60µVrms (10Hz–100kHz); meets low-noise requirements for ADC reference, PLL VCO, and image sensor analog chains. |
| Current Limit | 157mA ±25mA per channel with fold-back protection; prevents thermal runaway during short-circuit events without external current-sense components. |
| Quiescent Current | 35µA per active channel (EN high, no load); extends battery life in always-on fingerprint and wireless adapter subsystems. |
| Dropout Voltage | 0.30V max at 120mA for 1.8V output; enables efficient regulation from single-cell Li-ion (3.0V min) or boosted 3.3V rails. |
Pinout & Package
X2-DFN1212-6 package: 1.2mm × 1.2mm footprint, 0.4mm height, thermally enhanced with exposed pad (not electrically connected to GND by default; recommended for PCB copper thermal relief).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | VOUT1 | Regulated 1.2V output; connects directly to core logic or sensor I/O supply with local 0.47µF ceramic capacitor. |
| 2 | VOUT2 | Regulated 1.8V output; powers RF transceivers or camera ISP cores requiring tight voltage tolerance and low noise. |
| 3 | GND | Common ground return for both channels; must be tied to low-impedance PCB ground plane to minimize noise coupling. |
| 4 | EN2 | Active-high enable for Channel 2; driven high to activate 1.8V rail, low to shut down with auto-discharge (50Ω path to GND). |
| 5 | VIN | Shared input (1.7–5.25V); requires ≥0.47µF ceramic decoupling capacitor placed adjacent to pin to suppress supply glitches. |
| 6 | EN1 | Active-high enable for Channel 1; independently controls 1.2V rail for power sequencing in multi-voltage SoC applications. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent enable inputs | EN1 and EN2 allow precise power sequencing-e.g., bring up 1.2V core before enabling 1.8V RF section-to prevent latch-up or initialization faults. |
| Built-in auto-discharge | 50Ω internal N-channel FET per output rapidly discharges VOUT capacitance when disabled, eliminating need for external bleed resistors in space-constrained designs. |
| Ultra-low noise & high PSRR | 60µVrms noise + 75dB PSRR enables clean analog/RF power delivery without additional filtering stages, reducing component count and board area. |
| Wide input range & low dropout | 1.7–5.25V input with sub-0.3V dropout at 120mA allows direct regulation from single-cell batteries or intermediate 3.3V/5V rails without efficiency penalty. |
| High-accuracy current limit | 157mA ±25mA per channel provides predictable fault current limiting-critical for protecting downstream circuits in portable media players and fingerprint modules. |
Applications
| Fingerprint Modules | Smartphone/PAD Baseband |
|---|---|
|
Use Scenario: Powering capacitive fingerprint sensor ASIC and its analog front-end in biometric authentication subsystems. IC Role / Device Role / Timing Role: Dual-rail LDO supplying 1.2V digital core and 1.8V analog sensing interface with independent enable sequencing. Use Value: ±1% output accuracy ensures consistent sensor biasing; 60µVrms noise prevents false trigger events caused by supply-induced signal distortion. |
Use Scenario: Regulating voltage for baseband processor I/O banks and memory interfaces in mobile SoCs. IC Role / Device Role / Timing Role: Provides tightly regulated 1.2V (core logic) and 1.8V (I/O) rails with fast transient response to handle burst-mode data transfers. Use Value: 75dB PSRR rejects noise from high-frequency switching regulators; 35µA quiescent current minimizes standby power in always-listening voice assistant modes. |
| RF Transceiver Supplies | Camera Image Signal Processors |
|
Use Scenario: Delivering clean, low-noise power to 2.4GHz/5GHz Wi-Fi/BT transceivers in wireless adapters and IoT edge nodes. IC Role / Device Role / Timing Role: Isolates RF analog sections from noisy digital domains using dedicated 1.8V LDO channel with independent EN control. Use Value: Sub-0.3V dropout enables efficient operation from shared 3.3V system rail; 60µVrms noise preserves EVM and receiver sensitivity. |
Use Scenario: Powering CMOS image sensor and ISP in smartphone rear/front cameras requiring stable analog bias and low-noise digital supply. IC Role / Device Role / Timing Role: Supplies 1.2V ISP core and 1.8V sensor interface with simultaneous or staggered enable based on capture mode. Use Value: Fold-back current limit (157mA ±25mA) protects against pixel array short faults; thermal pad design supports sustained 120mA loads during video recording. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-LDO applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AP7345D-1218FS6-7 | Successor part with identical pinout, same 1.2V/1.8V outputs, but improved PSRR (80dB @1kHz) and lower noise (45µVrms). | Direct drop-in replacement; recommended for new designs requiring tighter noise/PSRR specs in RF or high-resolution imaging. | Select AP7345D if designing new products-Diodes explicitly states AP7346 is not recommended for new designs. |
| TPL7407LDR | TI dual LDO with 1.2V/1.8V outputs, but higher quiescent current (65µA), no auto-discharge, and larger SOT-23-8 package. | Lacks integrated discharge FETs and thermal performance of X2-DFN1212-6; suitable only where board space is less constrained. | Choose TPL7407LDR only if legacy compatibility or TI ecosystem alignment outweighs size/noise advantages of AP7346. |
Compared with AP7345D-1218FS6-7, this part offers lower PSRR and higher noise-making it suitable only for cost-sensitive legacy upgrades-not new designs. Versus TPL7407LDR, it delivers superior thermal density and auto-discharge functionality in half the footprint, but lacks TI's long-term automotive qualification path.
Availability
AP7346D-1218FS6-7 is available at Aetrix Electronics and suitable for fingerprint modules, smartphone baseband power, and RF transceiver supplies requiring stable component supply across industrial temperature ranges (−40°C to +85°C) and long-lifecycle production programs.
Supply support for AP7346D-1218FS6-7 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-efficiency power management, signal integrity, and protection solutions for consumer, industrial, and communications markets.
The AP7346 belongs to Diodes' high-accuracy dual-LDO product line, engineered specifically for space-constrained portable electronics demanding independent rail control, ultra-low noise, and robust fault protection in minimal footprint packages.
FAQ
Is AP7346D-1218FS6-7 recommended for new designs?
No. Diodes Incorporated explicitly states "THE AP7346 IS NOT RECOMMENDED FOR NEW DESIGNS. PLEASE USE THE AP7345D." The AP7345D offers improved PSRR (80dB vs. 75dB), lower output noise (45µVrms vs. 60µVrms), and identical pinout/package-making it a direct upgrade path without layout changes.
What is the function of the thermal pad on the X2-DFN1212-6 package?
The exposed thermal pad is not electrically connected to GND by default. It must be soldered to a large PCB copper area for thermal dissipation-ideally connected to GND for EMI reduction-but cannot serve as the sole GND electrode. Improper thermal pad connection risks thermal shutdown under 120mA continuous load per channel.
How does the auto-discharge feature operate on AP7346D-1218FS6-7?
When EN1 or EN2 is pulled low, the corresponding channel activates an internal 50Ω N-channel FET between VOUT and GND, discharging output capacitance rapidly. This eliminates need for external bleed resistors and prevents floating voltages that could cause latch-up in downstream logic during power-down sequences.
Can AP7346D-1218FS6-7 support different output capacitor values?
Yes-it is stable with ≥0.47µF ceramic capacitors. For high-transient loads (e.g., camera flash), Diodes recommends adding low-ESR bulk capacitance in parallel. ESR vs. output current graphs show stable operation below 10Ω ESR up to 130mA, with optimal stability achieved using X5R/X7R dielectrics placed within 2mm of VOUT and GND pins.
AP7346D-1218FS6-7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- 6-XFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 2
- Voltage - Input (Max):
- 5.25V
- Voltage - Output (Min/Fixed):
- 1.2V, 1.8V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 0.5V @ 120mA, 0.39V @ 120mA
- Current - Output:
- 130mA, 130mA
- Current - Quiescent (Iq):
- 100 µA
- Current - Supply (Max):
- -
- 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-DFN1212-6
AP7346D-1218FS6-7 FAQ
1.How can I place an order for AP7346D-1218FS6-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AP7346D-1218FS6-7 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 AP7346D-1218FS6-7 reliable?
The price and inventory of AP7346D-1218FS6-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP7346D-1218FS6-7 is usually 5 days.
3.What payment methods are accepted for AP7346D-1218FS6-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP7346D-1218FS6-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP7346D-1218FS6-7?
AP7346D-1218FS6-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP7346D-1218FS6-7 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 AP7346D-1218FS6-7?
For technical support, including AP7346D-1218FS6-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP7346D-1218FS6-7 requirements.
6.How does Aetrix verify that AP7346D-1218FS6-7 is sourced from the original manufacturer or authorized distributors?
All AP7346D-1218FS6-7 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 AP7346D-1218FS6-7 meets industry standards.
7.What is the process for return or replacement of AP7346D-1218FS6-7?
All AP7346D-1218FS6-7 units undergo pre-shipment inspection (PSI). If there is an issue with AP7346D-1218FS6-7, 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 AP7346D-1218FS6-7 part is unused and in its original packaging.
Return procedure for AP7346D-1218FS6-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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