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Diodes Incorporated AP7353-45FS4-7
- Part No.:
- AP7353-45FS4-7
- Manufacturer:
- Diodes Incorporated
- Package:
- 4-XDFN Exposed Pad
- Datasheet:
-
AP7353-45FS4-7.pdf
- Description:
- LDO CMOS LOWCURR X2-DFN1010-4 (T
- Quantity:
- Payment:
- Shipping:
Inventory:3,702
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Product details
Overview
AP7353-45FS4-7 from Diodes Incorporated is a 250mA low-dropout linear regulator with fixed 4.5V output, ±1% accuracy, 90dB PSRR at 1kHz (10mA load), 10µVrms output noise (10Hz–100kHz), and 18µA typical quiescent current. It operates from 2.0V to 5.5V input and delivers stable power to RF circuitry, camera modules, and portable media subsystems.
For engineers reviewing the AP7353-45FS4-7 datasheet, AP7353-45FS4-7 pinout, AP7353-45FS4-7 application, or AP7353-45FS4-7 equivalent, key selection criteria include dropout voltage at 250mA (114mV max for 4.5V output in X2-DFN1010-4), EN pin logic thresholds (0.4V low / 1.2V high), thermal resistance (237°C/W), and compatibility with 1µF ceramic output capacitors.
Technical Context
The AP7353-45FS4-7 implements a CMOS-based LDO architecture with integrated voltage reference, error amplifier, and current-limit protection. Its non-discharge configuration avoids automatic output discharge during shutdown, preserving downstream capacitor charge.
It features fast load transient response (<20µs recovery for 1mA→250mA step) and robust line regulation (0.02%/V), enabled by low-RDS(on) pass transistor design and optimized internal compensation for stability with minimal 1µF ceramic output capacitance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 4.5V ±1% - ensures precise biasing for 4.5V-tolerant analog/RF ICs without external feedback. |
| Max Output Current | 250mA - supports moderate-power subsystems like Wi-Fi/BT radios or image sensor interfaces. |
| PSRR @ 1kHz | 90dB at 10mA - suppresses switching noise from adjacent DC-DC converters feeding shared input rails. |
| Output Noise | 10µVrms (10Hz–100kHz) - minimizes phase noise in VCOs and SNR degradation in ADC front-ends. |
| Quiescent Current | 18µA typical - extends battery life in always-on wearable sensors and low-duty-cycle IoT nodes. |
| Dropout Voltage | 114mV max at 250mA (4.5V out) - enables operation down to 4.614V input, critical for Li-ion battery discharge tail-end. |
| Enable Threshold | VEN(H) ≥1.2V, VEN(L) ≤0.4V - compatible with 1.8V/3.3V GPIOs without level-shifting. |
Pinout & Package
X2-DFN1010-4 (Type B) package: 1.0mm × 1.0mm footprint, 0.4mm pitch, exposed thermal pad (EP) - enables ultra-compact PCB layout and efficient heat dissipation in space-constrained wearables.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: IN | Power Input | Accepts 2.0–5.5V supply; requires local 1µF ceramic decoupling placed adjacent to pin. |
| 2: GND | Ground Reference | Primary return path for input/output currents; must connect to solid ground plane under EP. |
| 3: EN | Enable Control | Active-high logic input; floating prohibited - tie to IN or MCU GPIO for on/off sequencing. |
| 4: OUT | Regulated Output | Delivers 4.5V ±1%; requires 1µF ceramic capacitor within 2mm of pin for stability. |
| EP | Thermal Pad | Not electrically functional; solder to large copper pour tied to GND for θJA = 237°C/W. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low noise regulation | 10µVrms output noise enables clean power for RF transceivers and precision ADCs without additional filtering. |
| High PSRR across frequency | 90dB at 1kHz and 70dB at 10kHz maintains signal integrity when co-located with noisy digital ICs. |
| Low-quiescent-current operation | 18µA IQ allows >1-year battery life in coin-cell-powered BLE beacons with 10s wake-up intervals. |
| Stable with minimal capacitance | Guaranteed stability with 1µF X7R/X5R ceramic output cap reduces BOM count and board area vs. larger electrolytics. |
| Fast transient response | 20µs load-step recovery time prevents brown-out during burst-mode transmission in wireless peripherals. |
Applications
| RF Power Amplifier Bias | CMOS Image Sensor Core Supply |
|---|---|
Use Scenario: Providing clean 4.5V bias to GaAs pHEMT power amplifiers in 2.4GHz Wi-Fi modules. IC Role / Device Role / Timing Role: Primary LDO delivering regulated VPA with minimal ripple-induced AM-to-PM distortion. Use Value: 90dB PSRR suppresses 1MHz–10MHz switching noise from PMIC, improving EVM by >3dB. | Use Scenario: Powering analog core circuits (ADC, PLL, pixel array) in 12MP mobile cameras. IC Role / Device Role / Timing Role: Low-noise post-regulator for noise-sensitive analog blocks downstream of main PMIC. Use Value: 10µVrms noise prevents fixed-pattern noise and quantization errors in 12-bit image data. |
| Wearable Heart Rate Monitor Analog Front-End | USB-C Peripheral VBUS-Sourced Logic Supply |
Use Scenario: Supplying 4.5V to optical sensor AFE and analog signal chain in optical PPG modules. IC Role / Device Role / Timing Role: Precision LDO isolating sensitive analog measurements from digital MCU noise. Use Value: ±1% output accuracy ensures consistent LED drive current and photodiode bias, reducing calibration drift. | Use Scenario: Generating stable 4.5V logic rail from variable USB-C VBUS (4.75–5.5V) in portable docking stations. IC Role / Device Role / Timing Role: Input-voltage-flexible LDO enabling direct VBUS regulation without buck converter. Use Value: 2.0–5.5V input range accommodates full USB-C spec; 114mV dropout allows >95% efficiency at 5V input. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AP7361-45FS4-7 | Higher 600mA output current; same 4.5V fixed output, ±1% accuracy, and X2-DFN1010-4 package. | Supports higher-current loads (e.g., multi-lane MIPI interfaces) but draws 25µA IQ (vs. 18µA). | Select when >250mA peak load is required and quiescent current penalty is acceptable. |
| MCP1826-4502E/DB | 4.5V fixed output, ±2% accuracy, 300mA rating, SOT-23-5 package; 65µA IQ, 70dB PSRR @ 1kHz. | Larger footprint and lower PSRR limit use in RF-critical designs; higher IQ reduces battery life. | Choose only if DFN1010-4 assembly capability is unavailable and 70dB PSRR suffices. |
Compared with AP7353-45FS4-7, AP7361-45FS4-7 trades 7µA higher quiescent current for 350mA extra output headroom, while MCP1826-4502E/DB sacrifices 20dB PSRR and 47µA IQ for legacy SOT-23 compatibility - making AP7353-45FS4-7 optimal for space-constrained, noise-sensitive 250mA applications.
Availability
AP7353-45FS4-7 is available at Aetrix Electronics and suitable for RF power amplifier biasing, CMOS image sensor core supplies, and wearable optical AFEs requiring stable component supply with guaranteed long-term manufacturability.
Supply support for AP7353-45FS4-7 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 devices, with manufacturing certified to IATF 16949 and product definitions aligned to AEC-Q standards.
The AP7353 series belongs to Diodes' high-PSRR, low-noise LDO family, engineered specifically for battery-powered portable electronics where RF performance, analog precision, and standby power efficiency are critical.
FAQ
What is the maximum allowable input voltage for AP7353-45FS4-7?
The absolute maximum input voltage is 6.0V per the datasheet's Absolute Maximum Ratings table. Continuous operation above 5.5V violates recommended conditions and risks permanent damage. For reliable 4.5V output, VIN must remain ≥4.614V (accounting for 114mV max dropout) and ≤5.5V.
Does AP7353-45FS4-7 include thermal shutdown protection?
Yes - the device integrates thermal shutdown that activates at +125°C junction temperature, disabling output until die temperature falls below the hysteresis threshold. This protection is confirmed in the Functional Block Diagram and Typical Performance Characteristics section showing short-circuit and thermal shutdown waveforms.
Can AP7353-45FS4-7 be used with tantalum output capacitors?
No - the datasheet explicitly specifies stability with ceramic capacitors (X7R/X5R) of ≥1µF and ESR <2Ω. Tantalum capacitors typically exhibit higher ESR and aging effects that may cause oscillation or poor transient response; using them voids the guaranteed stability specification.
Is the exposed pad (EP) on AP7353-45FS4-7 electrically connected to GND?
No - the EP is a thermal pad only, not an electrical terminal. The datasheet states it "must not be used as GND electrode function alone" and recommends connecting it to a large copper area tied to GND solely for thermal conduction, not for current return paths.
AP7353-45FS4-7 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):
- 5.5V
- Voltage - Output (Min/Fixed):
- 4.5V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 0.117V @ 250mA
- Current - Output:
- 250mA
- Current - Quiescent (Iq):
- 27 µA
- Current - Supply (Max):
- -
- PSRR:
- 90dB ~ 70dB (100Hz ~ 10kHz)
- Control Features:
- Current Limit, Enable
- Protection Features:
- Over Current, Over Temperature, Short Circuit
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- X2-DFN1010-4 (Type B)
AP7353-45FS4-7 FAQ
1.How can I place an order for AP7353-45FS4-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AP7353-45FS4-7 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 AP7353-45FS4-7 reliable?
The price and inventory of AP7353-45FS4-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP7353-45FS4-7 is usually 5 days.
3.What payment methods are accepted for AP7353-45FS4-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP7353-45FS4-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP7353-45FS4-7?
AP7353-45FS4-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP7353-45FS4-7 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 AP7353-45FS4-7?
For technical support, including AP7353-45FS4-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP7353-45FS4-7 requirements.
6.How does Aetrix verify that AP7353-45FS4-7 is sourced from the original manufacturer or authorized distributors?
All AP7353-45FS4-7 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 AP7353-45FS4-7 meets industry standards.
7.What is the process for return or replacement of AP7353-45FS4-7?
All AP7353-45FS4-7 units undergo pre-shipment inspection (PSI). If there is an issue with AP7353-45FS4-7, 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 AP7353-45FS4-7 part is unused and in its original packaging.
Return procedure for AP7353-45FS4-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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