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Diodes Incorporated AP7346D-3318FS6-7
- Part No.:
- AP7346D-3318FS6-7
- Manufacturer:
- Diodes Incorporated
- Package:
- 6-XFDFN Exposed Pad
- Datasheet:
-
AP7346D-3318FS6-7.pdf
- Description:
- IC REG LIN 1.8V/3.3V X2DFN1212-6
- Quantity:
- Payment:
- Shipping:
Inventory:2,696
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Product details
Overview
AP7346D-3318FS6-7 from Diodes Incorporated is a dual-channel, high-accuracy current-limiting LDO regulator in X2-DFN1212-6 package, delivering fixed 3.3V and 1.8V outputs with ±1% accuracy, 75dB PSRR at 1kHz, and 60µVrms output noise (10Hz–100kHz). It features independent enable pins (EN1/EN2), low 35µA quiescent current (single-channel active), and integrated auto-discharge for rapid output voltage decay during shutdown - optimized for RF supply rails and camera sensor power in space-constrained portable devices.
For engineers reviewing the AP7346D-3318FS6-7 datasheet, AP7346D-3318FS6-7 pinout, AP7346D-3318FS6-7 application, or AP7346D-3318FS6-7 equivalent, key selection criteria include dual-output voltage pairing, channel-independent enable control, current-limit accuracy (157mA ±25mA), thermal performance in 1.2mm × 1.2mm DFN, and compatibility with low-ESR ceramic capacitors down to 0.47µF.
Technical Context
The AP7346D-3318FS6-7 integrates two independent CMOS-based LDO regulators sharing a single VIN input but featuring separate EN1/EN2 controls and VOUT1/VOUT2 outputs. Each channel includes a precision voltage reference, error amplifier, current-limit circuit, and auto-discharge NMOS (50Ω typical on-resistance) activated upon enable deassertion.
It operates across 1.7V–5.25V input range with dropout voltages ranging from 0.22V (3.0V < VOUT ≤ 3.6V, IOUT = 120mA) to 0.59V (VOUT ≤ 1.2V, IOUT = 120mA), and delivers stable regulation under load transients up to 150mA with <30mV load regulation error and 0.1%/V line regulation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VOUT1 / VOUT2 | 3.3V / 1.8V fixed - eliminates external resistor network; supports independent biasing of RF front-end and baseband logic. |
| Output Accuracy | ±1% at +25°C, ±1.5% over −40°C to +85°C - ensures stable core voltage for 1.8V digital interfaces and precise 3.3V analog/RF supply. |
| PSRR | 75dB at 1kHz - suppresses switching noise from adjacent DC-DC converters feeding shared input rail. |
| Output Noise | 60µVrms (10Hz–100kHz) - meets low-noise requirements for image sensor analog signal chains and RF synthesizer VCO supplies. |
| Quiescent Current | 35µA (one channel active, no load) - extends battery life in always-on sensor modules and standby communication subsystems. |
| Current Limit | 157mA ±25mA per channel - provides predictable short-circuit protection without requiring external current-sense components. |
| Enable Thresholds | EN high ≥1.3V, EN low ≤0.5V - compatible with 1.8V/3.3V GPIOs; prevents floating-input latch-up in battery-powered systems. |
Pinout & Package
X2-DFN1212-6 package: 1.2mm × 1.2mm footprint, 0.4mm pitch, 0.39mm nominal height, thermal pad exposed on bottom for PCB copper thermal relief.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | VOUT1 | 3.3V regulated output - requires local 0.47µF ceramic capacitor; routed directly to RF IC VDDIO or PMIC input. |
| 2 | VOUT2 | 1.8V regulated output - placed adjacent to camera sensor core logic; decoupled with dedicated 0.47µF cap. |
| 3 | GND | Analog/digital common ground - connected to thermal pad and system GND plane via multiple vias for low-impedance return path. |
| 4 | EN2 | Active-high enable for VOUT2 - pulled high to VIN or controlled by baseband processor GPIO to sequence 1.8V domain power-up. |
| 5 | VIN | Shared 1.7V–5.25V input - fed from buck converter or battery; requires 0.47µF ceramic cap placed within 2mm of pin. |
| 6 | EN1 | Active-high enable for VOUT1 - independently controlled to manage RF power state without affecting 1.8V logic domain. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent enable inputs | EN1 and EN2 allow staggered power sequencing - e.g., enable 3.3V RF supply before 1.8V sensor logic to meet startup timing constraints. |
| Integrated auto-discharge | 50Ω NMOS discharge path per channel clears residual charge in <100µs after EN deactivation - prevents latch-up in hot-plug or reset scenarios. |
| Low-noise, high-PSRR regulation | 60µVrms noise + 75dB PSRR enables direct powering of RF synthesizers and CIS analog front-ends without additional filtering. |
| Wide input voltage range | 1.7V–5.25V operation supports single-cell Li-ion (2.7–4.2V), USB 5V, or boosted 3.3V rails - simplifies multi-source power architecture. |
| High-accuracy current limit | 157mA ±25mA per channel provides repeatable fault response - avoids overdesign of upstream current sources and PCB trace widths. |
Applications
| Fingerprint Module Power | Smartphone Camera Subsystem |
|---|---|
|
Use Scenario: Dual-rail power for capacitive fingerprint sensor IC requiring isolated 3.3V analog supply and 1.8V digital interface voltage. IC Role / Device Role / Timing Role: Provides tightly regulated, low-noise 3.3V for sensor excitation and 1.8V for SPI/I²C interface - enabling sub-100ms wake-and-scan latency. Use Value: Independent EN1/EN2 allows synchronized power-down of both rails during idle, reducing leakage current to <1µA total standby. |
Use Scenario: Dedicated LDO pair for CMOS image sensor: 3.3V for analog pixel array and 1.8V for digital ISP core and MIPI transmitter. IC Role / Device Role / Timing Role: Regulator channels supply critical analog and digital domains with <±1.5% tolerance across temperature - preserving ADC linearity and clock jitter specs. Use Value: 60µVrms noise and 75dB PSRR prevent switching artifacts from appearing as fixed-pattern noise in captured images. |
| Wireless Communication Adapter | Portable Media Player Audio Codec |
|
Use Scenario: Powering Bluetooth/Wi-Fi combo module with separate 3.3V RF PA supply and 1.8V baseband processor core. IC Role / Device Role / Timing Role: Enables fast enable/disable of RF chain while keeping baseband logic powered - supporting BLE advertising interval optimization. Use Value: Auto-discharge on EN1 ensures 3.3V rail collapses fully before re-enabling, eliminating shoot-through risk during rapid mode transitions. |
Use Scenario: Low-noise bias for stereo audio DAC/ADC requiring clean 3.3V reference and 1.8V digital core voltage. IC Role / Device Role / Timing Role: Delivers ultra-low 60µVrms noise to analog supply pins - achieving >105dB SNR in headphone amplifier output stage. Use Value: 35µA quiescent current per active channel extends playback time in battery-operated players without compromising THD+N performance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-output LDO applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AP7345D-3318FS6-7 | Successor device; identical pinout, same 3.3V/1.8V outputs, improved current limit accuracy (±15mA vs ±25mA), lower dropout (0.20V @ 3.3V/120mA). | Recommended for new designs; supports tighter load regulation and higher efficiency in thermally constrained layouts. | Select when designing for production release post-2023; offers longer lifecycle and enhanced transient response. |
| TPL7407LDR | Single-channel 3.3V LDO (no 1.8V output); 200mA limit, 50µA IQ, 65dB PSRR - lacks dual-rail capability and auto-discharge. | Requires external 1.8V LDO or DC-DC; increases BOM count and board area; no coordinated shutdown. | Only viable if redesign permits splitting rails and accepting higher noise floor and no discharge control. |
Compared with AP7346D-3318FS6-7, the AP7345D-3318FS6-7 delivers tighter current-limit tolerance and lower dropout for improved thermal margin, while the TPL7407LDR forces discrete rail management and sacrifices coordinated power sequencing - making the AP7346D suitable only for legacy design refresh or cost-sensitive drop-in replacement where its ±25mA OCP tolerance remains acceptable.
Availability
AP7346D-3318FS6-7 is available at Aetrix Electronics and suitable for fingerprint modules, smartphone camera subsystems, and wireless communication adapters requiring stable component supply with guaranteed long-term sourcing.
Supply support for AP7346D-3318FS6-7 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 power management, signal integrity, and connectivity solutions for consumer, industrial, and automotive markets.
The AP7346 series belongs to Diodes' high-accuracy dual-LDO product line, designed specifically for portable electronics requiring compact, low-noise, and sequenced dual-rail power delivery with minimal external components.
FAQ
What is the thermal pad connection requirement for AP7346D-3318FS6-7?
The thermal pad on the underside of the X2-DFN1212-6 package must be connected to a large copper pour tied to GND for optimal heat dissipation. It should not serve as the sole GND electrode; instead, use it in parallel with Pin 3 (GND) to reduce thermal resistance below 120°C/W. Avoid solder mask coverage over the pad to ensure full thermal contact.
Can AP7346D-3318FS6-7 operate with only one channel enabled?
Yes - EN1 and EN2 are fully independent. Enabling only EN1 powers VOUT1 (3.3V) while VOUT2 remains off and discharged; enabling only EN2 powers VOUT2 (1.8V) with VOUT1 in shutdown. Quiescent current drops to 35µA in this configuration, and auto-discharge actively clears the disabled channel's output.
What is the minimum recommended output capacitance for stable operation?
The AP7346D-3318FS6-7 is stable with 0.47µF ceramic capacitors on both VOUT1 and VOUT2. These must be placed within 2mm of their respective output pins and use X5R/X7R dielectrics with ≤10mΩ ESR. Larger values (e.g., 1µF) improve transient response but are not required for stability.
Is AP7346D-3318FS6-7 qualified for automotive applications?
No - the AP7346D-3318FS6-7 is not AEC-Q100 qualified. Diodes states that automotive-grade variants require specific change control, PPAP capability, and IATF 16949 manufacturing; this part is intended for commercial portable electronics. For automotive use, consult Diodes' AP7345Q or AP7361Q series.
AP7346D-3318FS6-7 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):
- 1.8V, 3.3V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 0.39V @ 120mA, 0.29V @ 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-3318FS6-7 FAQ
1.How can I place an order for AP7346D-3318FS6-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AP7346D-3318FS6-7 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-3318FS6-7 reliable?
The price and inventory of AP7346D-3318FS6-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP7346D-3318FS6-7 is usually 5 days.
3.What payment methods are accepted for AP7346D-3318FS6-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP7346D-3318FS6-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP7346D-3318FS6-7?
AP7346D-3318FS6-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP7346D-3318FS6-7 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-3318FS6-7?
For technical support, including AP7346D-3318FS6-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP7346D-3318FS6-7 requirements.
6.How does Aetrix verify that AP7346D-3318FS6-7 is sourced from the original manufacturer or authorized distributors?
All AP7346D-3318FS6-7 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-3318FS6-7 meets industry standards.
7.What is the process for return or replacement of AP7346D-3318FS6-7?
All AP7346D-3318FS6-7 units undergo pre-shipment inspection (PSI). If there is an issue with AP7346D-3318FS6-7, 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-3318FS6-7 part is unused and in its original packaging.
Return procedure for AP7346D-3318FS6-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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