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Diodes Incorporated AP7344D-3318RH4-7
- Part No.:
- AP7344D-3318RH4-7
- Manufacturer:
- Diodes Incorporated
- Package:
- 8-XFDFN Exposed Pad
- Datasheet:
-
AP7344D-3318RH4-7.pdf
- Description:
- IC REG LIN 1.8V/3.3V X2DFN1612-8
- Quantity:
- Payment:
- Shipping:
Inventory:4,697
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Product details
Overview
AP7344D-3318RH4-7 from Diodes Incorporated is a dual-channel CMOS low-dropout regulator delivering fixed 3.3V and 1.8V outputs, each rated for 300mA continuous current, ±1% output voltage accuracy, 75dB PSRR at 1kHz, and 60µVrms output noise (10Hz–100kHz). It operates from 1.7V to 5.25V input and features independent enable inputs (EN1/EN2) for power sequencing in compact portable electronics.
For engineers reviewing the AP7344D-3318RH4-7 datasheet, AP7344D-3318RH4-7 pinout, AP7344D-3318RH4-7 application, or AP7344D-3318RH4-7 equivalent, key selection criteria include dual-rail low-noise supply capability, thermal performance in X2-DFN1612-8, channel-specific enable control, and discharge functionality (D-suffix) for rapid VOUT discharge during shutdown.
Technical Context
The AP7344D-3318RH4-7 integrates two independent LDO regulators on a single CMOS die, each with dedicated error amplifier, voltage reference, current-limit circuit, and enable logic. Its architecture supports simultaneous or staggered channel activation via EN1 and EN2, with no cross-talk between channels under load transients.
It implements auto-discharge (D-suffix) via integrated N-channel MOSFETs (50Ω typical on-resistance per channel) that actively pull VOUT1/VOUT2 to GND when respective EN pins are driven low-critical for preventing back-powering in multi-rail systems. Dropout voltage is as low as 220mV at 300mA for the 3.3V rail and 480mV for the 1.8V rail.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltages | 3.3V (Channel 1) and 1.8V (Channel 2), factory-fixed, eliminating external resistor networks |
| Output Current | 300mA per channel - sufficient to power core logic (e.g., ARM Cortex-M peripherals) and I/O rails concurrently |
| Output Accuracy | ±1% at +25°C, ±1.5% over −40°C to +85°C - enables tight margining for 1.8V FPGA I/O and 3.3V USB PHY supplies |
| PSRR | 75dB at 1kHz - suppresses switching noise from adjacent DC-DC converters feeding the VIN rail |
| Output Noise | 60µVrms (10Hz–100kHz) - preserves SNR in analog front-ends and RF bias supplies |
| Quiescent Current | 100–140µA (both channels enabled, no load) - extends battery life in always-on sensor nodes |
| Dropout Voltage | 220mV (3.3V channel @ 300mA), 480mV (1.8V channel @ 300mA) - allows operation from single-cell Li-ion (3.0V min) with headroom |
Pinout & Package
AP7344D-3318RH4-7 is housed in an 8-pin X2-DFN1612-8 package (1.6mm × 1.2mm, 0.4mm pitch) with exposed thermal pad. The package enables ultra-dense PCB layouts and requires thermal copper area connected to GND for optimal power dissipation (max 600mW).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pins 1, 4) | Common ground reference | Dual GND pins reduce ground impedance and improve PSRR; thermal pad must be soldered to large GND copper pour |
| VOUT1 (Pin 2) | Channel 1 regulated output | Delivers fixed 3.3V; requires local 1.0µF ceramic capacitor for stability and transient response |
| VOUT2 (Pin 3) | Channel 2 regulated output | Delivers fixed 1.8V; independent of VOUT1 - supports split-rail SoC core/I/O domains |
| EN2 (Pin 5) | Channel 2 enable input | Active-high logic: >1.3V enables 1.8V rail; <0.5V disables it and activates auto-discharge |
| VIN2 (Pin 6) | Channel 2 input supply | Accepts 1.7–5.25V; may be tied to VIN1 or powered separately for rail isolation |
| VIN1 (Pin 7) | Channel 1 input supply | Accepts 1.7–5.25V; shared or independent input improves flexibility in multi-source systems |
| EN1 (Pin 8) | Channel 1 enable input | Active-high logic: >1.3V enables 3.3V rail; <0.5V disables it and activates auto-discharge |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent LDOs | Enables discrete power sequencing: e.g., bring up 1.8V core before enabling 3.3V interface peripherals |
| Auto-discharge (D-suffix) | 50Ω internal NMOS per channel discharges VOUT within microseconds upon EN deactivation - prevents latch-up in downstream logic |
| High PSRR & low noise | 75dB rejection at 1kHz + 60µVrms noise ensures clean supply for RF transceivers and ADC reference circuits |
| Ultra-low quiescent current | 100µA typical with both channels active - critical for battery-backed real-time clocks and wake-on-event subsystems |
| Wide input range | 1.7V–5.25V operation supports direct connection to Li-ion, USB, or buck converter outputs without intermediate regulation |
Applications
| Smartphone Baseband Power | RF Front-End Bias Supply |
|---|---|
|
Use Scenario: Dual-rail power for application processor (1.8V core) and connectivity subsystem (3.3V USB/SDIO). IC Role / Device Role / Timing Role: Primary dual-LDO supplying isolated voltage domains with independent enable control for boot sequence compliance. Use Value: Eliminates need for two discrete regulators and reduces BOM count by 1 component while maintaining rail separation. |
Use Scenario: Low-noise bias for PA driver stages and LNA in 5G mmWave modules. IC Role / Device Role / Timing Role: Clean 3.3V rail for RF power amplifiers; 1.8V rail for digital control logic and bias DACs. Use Value: 60µVrms noise and 75dB PSRR prevent AM-to-PM distortion and maintain EVM performance under dynamic load. |
| Multi-Sensor Wearable Hub | Industrial Camera Module |
|
Use Scenario: Powering MEMS accelerometer (1.8V), BLE SoC (3.3V I/O), and optical heart-rate sensor (3.3V analog). IC Role / Device Role / Timing Role: Single-package solution for mixed-voltage sensor aggregation with programmable enable timing. Use Value: 100µA quiescent current extends coin-cell life beyond 12 months in sleep mode with periodic wake-ups. |
Use Scenario: Providing regulated 3.3V for image sensor interface and 1.8V for CIS pixel array clocking circuits. IC Role / Device Role / Timing Role: Dual-output LDO ensuring timing-critical 1.8V domain remains stable during high-current sensor readout bursts. Use Value: 300mA per channel supports peak currents during rolling shutter exposure without dropout or ripple-induced banding. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-LDO applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AP7345D-3318RH4-7 | Successor device with improved PSRR (80dB @ 1kHz), lower dropout (190mV @ 300mA, 3.3V), and extended temp range (−40°C to +125°C). | Qualified for automotive AEC-Q100 Grade 2; supports under-hood camera modules where ambient exceeds 85°C. | Select for new designs requiring higher reliability margin or automotive qualification; pin- and footprint-compatible. |
| TPL7407LDR | Single-channel 300mA LDO (3.3V only); no 1.8V rail or dual enable; 65dB PSRR; no auto-discharge. | Lacks dual-rail capability - requires second regulator for 1.8V, increasing board area and cost. | Only viable if 1.8V rail is sourced elsewhere; not a functional replacement for dual-output requirement. |
Compared with AP7344D-3318RH4-7, the AP7345D-3318RH4-7 delivers measurable improvements in thermal robustness and noise rejection, while the TPL7407LDR fails to meet the fundamental dual-output requirement - making the AP7345D the only drop-in upgrade path for new designs.
Availability
AP7344D-3318RH4-7 is available at Aetrix Electronics and suitable for smartphone baseband power, RF front-end bias, multi-sensor wearable hubs, and industrial camera modules requiring stable component supply across production lifecycles.
Supply support for AP7344D-3318RH4-7 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 ICs, with emphasis on power management, signal integrity, and protection solutions for consumer, industrial, and communications markets.
The AP7344 series belongs to Diodes' high-PSRR, low-noise LDO portfolio, designed specifically for space-constrained, battery-powered portable electronics demanding dual-rail precision regulation and fast enable/disable control.
FAQ
What is the function of the thermal pad on the AP7344D-3318RH4-7 package?
The exposed thermal pad on the X2-DFN1612-8 package must be soldered to a large GND-connected copper area on the PCB to dissipate heat effectively. It is not electrically functional as a GND terminal but significantly lowers junction-to-board thermal resistance - critical for sustaining 300mA per channel at ambient temperatures up to +85°C without derating.
Can AP7344D-3318RH4-7 operate with only one channel enabled?
Yes. EN1 and EN2 are fully independent: driving EN1 high and EN2 low powers only the 3.3V rail while placing the 1.8V regulator in shutdown (0.1–1.0µA standby current). This enables dynamic rail gating - for example, powering the 3.3V USB interface only during data transfer while keeping the 1.8V core domain off until system wake.
Is the auto-discharge feature active on both channels simultaneously?
Yes. The D-suffix indicates integrated discharge NMOS transistors on both VOUT1 and VOUT2. When EN1 is pulled low, the 3.3V rail discharges through its dedicated 50Ω path; when EN2 is pulled low, the 1.8V rail discharges independently. This prevents back-powering of disabled domains and eliminates hold-up voltage issues in multi-rail systems.
What are the minimum recommended input and output capacitors?
A minimum 0.47µF ceramic capacitor is required between each VIN pin and GND; 1.0µF ceramic capacitors are recommended for COUT on both VOUT1 and VOUT2. These values ensure stability across temperature and load, support fast transient response, and maintain PSRR performance - especially critical for RF and high-speed digital loads.
AP7344D-3318RH4-7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- 8-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 @ 300mA, 0.29V @ 300mA
- Current - Output:
- 300mA, 300mA
- Current - Quiescent (Iq):
- 140 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-DFN1612-8
AP7344D-3318RH4-7 FAQ
1.How can I place an order for AP7344D-3318RH4-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AP7344D-3318RH4-7 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 AP7344D-3318RH4-7 reliable?
The price and inventory of AP7344D-3318RH4-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP7344D-3318RH4-7 is usually 5 days.
3.What payment methods are accepted for AP7344D-3318RH4-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP7344D-3318RH4-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP7344D-3318RH4-7?
AP7344D-3318RH4-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP7344D-3318RH4-7 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 AP7344D-3318RH4-7?
For technical support, including AP7344D-3318RH4-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP7344D-3318RH4-7 requirements.
6.How does Aetrix verify that AP7344D-3318RH4-7 is sourced from the original manufacturer or authorized distributors?
All AP7344D-3318RH4-7 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 AP7344D-3318RH4-7 meets industry standards.
7.What is the process for return or replacement of AP7344D-3318RH4-7?
All AP7344D-3318RH4-7 units undergo pre-shipment inspection (PSI). If there is an issue with AP7344D-3318RH4-7, 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 AP7344D-3318RH4-7 part is unused and in its original packaging.
Return procedure for AP7344D-3318RH4-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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