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Diodes Incorporated AP7345D-1818RH4-7
- Part No.:
- AP7345D-1818RH4-7
- Manufacturer:
- Diodes Incorporated
- Package:
- 8-XFDFN Exposed Pad
- Datasheet:
-
AP7345D-1818RH4-7.pdf
- Description:
- IC REG LIN 1.8V/1.8V 300MA 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,157
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Product details
Overview
AP7345D-1818RH4-7 from Diodes Incorporated is a dual-channel, 300mA low-dropout linear regulator with independent enable control per channel, fixed 1.8V output on both channels, ±1% output voltage accuracy over temperature, 75dB PSRR at 1kHz, and 60µVrms output noise (10Hz–100kHz). It operates from 1.7V to 5.25V input and targets power-sensitive RF and digital core supplies in portable communication devices.
For engineers reviewing the AP7345D-1818RH4-7 datasheet, AP7345D-1818RH4-7 pinout, AP7345D-1818RH4-7 application, or AP7345D-1818RH4-7 equivalent, key selection criteria include dual independent enable logic, thermal shutdown at +150°C with 20°C hysteresis, ultra-low 50µA quiescent current (single-channel active), and X2-DFN1612-8 package compatibility with high-density PCB layouts.
Technical Context
The AP7345D-1818RH4-7 integrates two independent CMOS-based LDO regulators sharing no internal bias or reference coupling-each features its own error amplifier, voltage reference, current-limit circuit, and dedicated EN pin. Each channel delivers regulated 1.8V output with dropout as low as 0.30V at 300mA (for VOUT > 2.1V).
It supports independent sequencing via EN1/EN2, provides built-in short-circuit protection (≈60mA fold-back), and includes auto-discharge functionality for both outputs when disabled. The device meets RoHS 3, halogen-free, and antimony-free green standards with a thermal pad optimized for PCB copper-area heat sinking.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.8V per channel; enables direct replacement of single-supply 1.8V logic rails without external resistors. |
| Output Accuracy | ±1% at +25°C, ±1.5% over –40°C to +85°C; ensures stable core voltage for 1.8V I/O interfaces and memory subsystems. |
| PSRR | 75dB at 1kHz; suppresses switching noise from adjacent DC-DC converters feeding noisy system rails. |
| Output Noise | 60µVrms (10Hz–100kHz); suitable for noise-sensitive analog blocks like RF transceivers and camera sensor analog front-ends. |
| Quiescent Current | 50µA (one channel active, other disabled); extends battery life in always-on subsystems such as Bluetooth LE receivers. |
| Dropout Voltage | 0.30V max at 300mA (VOUT = 1.8V); allows operation from 2.1V input, compatible with single-cell Li-ion or Li-poly discharged states. |
| Thermal Shutdown | +150°C threshold with +20°C hysteresis; prevents latch-up during sustained high-current or poor-PCB thermal conditions. |
Pinout & Package
AP7345D-1818RH4-7 is housed in an X2-DFN1612-8 package (1.6mm × 1.2mm, 0.4mm height) with wettable flank leads and an exposed thermal pad. The package supports automated optical inspection (AOI) and provides low thermal resistance when connected to PCB copper pour tied to GND.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pins 1, 4) | Power ground reference | Dual GND pins reduce ground loop impedance and improve PSRR; must be connected to low-impedance PCB ground plane. |
| VOUT1 (Pin 2) | Channel 1 regulated output | Delivers 1.8V @ up to 300mA; requires local 1µF ceramic capacitor placed adjacent to pin and GND. |
| VOUT2 (Pin 3) | Channel 2 regulated output | Independent 1.8V output; supports separate power domains (e.g., RF transceiver + baseband processor core). |
| EN2 (Pin 5) | Channel 2 enable input | Logic-high (>1.3V) enables VOUT2; floating or <0.5V disables it; supports dynamic power gating. |
| VIN2 (Pin 6) | Channel 2 input supply | Accepts 1.7V–5.25V; decoupled by dedicated 1µF input capacitor to suppress rail noise injection. |
| VIN1 (Pin 7) | Channel 1 input supply | Independent input rail; enables split-input architectures (e.g., VIN1 from buck converter, VIN2 from battery). |
| EN1 (Pin 8) | Channel 1 enable input | Asynchronous enable control; allows staggered startup or independent sleep/wake sequencing. |
| Thermal Pad | Thermal dissipation node | Not electrically functional as GND; must be soldered to large copper area (ideally connected to GND plane) for thermal relief. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent enable inputs | EN1/EN2 allow per-channel power gating-critical for multi-rail SoC subsystems requiring precise wake/sleep timing. |
| Ultra-low noise output | 60µVrms noise floor enables clean power for RF synthesizers and high-speed ADC/DAC reference supplies. |
| High PSRR across frequency | 75dB at 1kHz and maintained >50dB up to 100kHz-effectively isolates sensitive analog circuits from switcher ripple. |
| Auto-discharge on disable | Internal 30Ω N-channel discharge path rapidly collapses VOUT to GND when EN is low-prevents floating voltage on powered-down rails. |
| Stable with 1µF ceramic capacitors | No external ESR requirements simplify BOM and layout; eliminates need for bulk tantalum or polymer caps. |
Applications
| Smartphone Baseband Core | RF Transceiver Supply |
|---|---|
|
Use Scenario: Powering ARM Cortex-A series application processor cores and cache SRAM operating at 1.8V. IC Role / Device Role / Timing Role: Dual LDO providing tightly regulated, low-noise 1.8V rails with independent enable for dynamic voltage/frequency scaling (DVFS) states. Use Value: Enables sub-100mV supply tolerance required for 28nm/16nm logic, while EN sequencing avoids bus contention during core reset. |
Use Scenario: Supplying PLL VCO and mixer bias in 2.4GHz/5GHz Wi-Fi/BT transceivers. IC Role / Device Role / Timing Role: Low-noise, high-PSRR dual LDO delivering isolated 1.8V to RF analog sections, rejecting digital switching noise from nearby baseband ICs. Use Value: Maintains EVM < –35dB under heavy digital load, directly improving wireless link margin and throughput. |
| Camera Sensor Interface | Portable Media Decoder |
|
Use Scenario: Powering CIS (CMOS Image Sensor) analog front-end and MIPI D-PHY receiver logic. IC Role / Device Role / Timing Role: One channel powers analog pixel array (low noise critical), second powers digital interface (fast transient response needed). Use Value: Prevents image banding from supply ripple and ensures MIPI eye diagram compliance during burst data transfers. |
Use Scenario: Supplying video decoder ASIC and HDMI transmitter logic in portable media players. IC Role / Device Role / Timing Role: Dual 1.8V LDO supporting simultaneous decode engine and display interface, with independent enable for standby mode. Use Value: Reduces system standby current to <1µA via full channel shutdown, extending playback time on single-cell batteries. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-LDO applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Torex XC6216D1818MR-G | Same 1.8V/1.8V dual output, but only 200mA per channel and no auto-discharge; PSRR 65dB @ 1kHz. | Lacks discharge path-requires external MOSFET for rail collapse; lower current limits suitability for high-speed interface loads. | Select when cost sensitivity outweighs need for 300mA drive or fast discharge, and PSRR >65dB is sufficient. |
| Ricoh RP512L1818A-TR | 300mA dual LDO with 1.8V/1.8V, but quiescent current 85µA (vs. 50µA), no thermal shutdown, and larger SOT-23-8 package. | No thermal protection increases risk in compact enclosures; larger footprint conflicts with ultra-thin mobile designs. | Prefer only if board space permits SOT-23-8 and thermal derating analysis confirms safe operation without shutdown. |
Compared with XC6216D1818MR-G and RP512L1818A-TR, AP7345D-1818RH4-7 uniquely combines 300mA drive, 50µA IQ, auto-discharge, thermal shutdown, and 1.6mm × 1.2mm footprint-making it optimal for space-constrained, thermally aggressive, and battery-sensitive dual-rail systems.
Availability
AP7345D-1818RH4-7 is available at Aetrix Electronics and suitable for smartphone baseband power, RF transceiver biasing, and camera sensor interface applications requiring stable component supply, consistent parametric performance, and long-term production continuity.
Supply support for AP7345D-1818RH4-7 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, with design centers across Asia, Europe, and the US, and manufacturing in ASE, J-Devices, and internal fabs.
The AP7345D belongs to Diodes' high-PSRR, low-noise LDO family targeting portable and wireless applications where power integrity, battery life, and miniaturization are critical design constraints.
FAQ
What is the minimum input voltage required for stable 1.8V output at 300mA?
The AP7345D-1818RH4-7 requires a minimum input voltage of 2.1V to maintain 1.8V output at 300mA load, based on its maximum dropout voltage of 0.30V under those conditions. Below 2.1V input, regulation degrades and output drops proportionally.
Can EN1 and EN2 be tied together and driven by a single GPIO?
Yes-EN1 and EN2 may be paralleled and driven by one microcontroller GPIO, provided the source can sink/source ≥1µA and meet the 0–0.5V low and 1.3–5.25V high thresholds. However, independent control preserves flexibility for staggered power-up or selective channel shutdown.
Is the thermal pad electrically connected to GND internally?
No-the thermal pad is not internally connected to any signal or power net. It must be externally connected to PCB GND copper for thermal performance, but should never serve as the sole GND return path; dedicated GND pins (1 and 4) carry return current.
Does AP7345D-1818RH4-7 support ceramic output capacitors smaller than 1µF?
No-Diodes specifies 1µF minimum ceramic output capacitance for stability across all operating conditions. Using smaller values risks oscillation or degraded transient response, as confirmed in the datasheet's stability analysis and ESR vs. IOUT graph.
AP7345D-1818RH4-7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- 8-XFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 2
- Voltage - Input (Max):
- 5.25V
- Voltage - Output (Min/Fixed):
- 1.8V, 1.8V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 0.39V @ 300mA, 0.39V @ 300mA
- Current - Output:
- 300mA, 300mA
- Current - Quiescent (Iq):
- 140 µA
- Current - Supply (Max):
- 70 µA
- PSRR:
- 75dB (1kHz)
- Control Features:
- Current Limit, Enable
- Protection Features:
- Short Circuit
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- X2-DFN1612-8
AP7345D-1818RH4-7 FAQ
1.How can I place an order for AP7345D-1818RH4-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AP7345D-1818RH4-7 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 AP7345D-1818RH4-7 reliable?
The price and inventory of AP7345D-1818RH4-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP7345D-1818RH4-7 is usually 5 days.
3.What payment methods are accepted for AP7345D-1818RH4-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP7345D-1818RH4-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP7345D-1818RH4-7?
AP7345D-1818RH4-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP7345D-1818RH4-7 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 AP7345D-1818RH4-7?
For technical support, including AP7345D-1818RH4-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP7345D-1818RH4-7 requirements.
6.How does Aetrix verify that AP7345D-1818RH4-7 is sourced from the original manufacturer or authorized distributors?
All AP7345D-1818RH4-7 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 AP7345D-1818RH4-7 meets industry standards.
7.What is the process for return or replacement of AP7345D-1818RH4-7?
All AP7345D-1818RH4-7 units undergo pre-shipment inspection (PSI). If there is an issue with AP7345D-1818RH4-7, 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 AP7345D-1818RH4-7 part is unused and in its original packaging.
Return procedure for AP7345D-1818RH4-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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