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Diodes Incorporated AP7353-18FS4-7
- Part No.:
- AP7353-18FS4-7
- Manufacturer:
- Diodes Incorporated
- Package:
- 4-XDFN Exposed Pad
- Datasheet:
-
AP7353-18FS4-7.pdf
- Description:
- IC REG LINEAR 1.8V 250MA 4DFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,314
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Product details
Overview
AP7353-18FS4-7 from Diodes Incorporated is a 250mA low-dropout linear regulator with fixed 1.8V output, ±1% accuracy, 90dB PSRR at 1kHz, 10µVrms output noise (10Hz–100kHz), and 18µA typical quiescent current. It operates from 2.0V to 5.5V input and features enable control, thermal shutdown, and short-circuit protection - designed for RF power supply rails in compact portable electronics.
For engineers reviewing the AP7353-18FS4-7 datasheet, AP7353-18FS4-7 pinout, AP7353-18FS4-7 application, or AP7353-18FS4-7 equivalent, key selection criteria include dropout voltage at 250mA (130–240mV), package thermal resistance (θJA = 237°C/W), EN logic thresholds (0.0–0.4V low / 1.2–5.5V high), and compatibility with 1µF ceramic output capacitors.
Technical Context
The AP7353-18FS4-7 implements a CMOS-based LDO architecture with integrated voltage reference, error amplifier, and current-limit circuitry. Its non-discharge configuration avoids automatic output discharge during shutdown, preserving downstream capacitor charge.
It delivers fast load transient response (<20µs settling for 1mA→250mA step) and stable regulation across –40°C to +85°C ambient, supported by low temperature coefficient (±30ppm/°C) and tight line/load regulation (0.02%/V and 0.004%/mA).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.8V ±1% - ensures precise biasing for 1.8V I/O domains and low-voltage RF ICs. |
| Max Output Current | 250mA - supports moderate-power digital cores, sensors, and RF front-end stages. |
| PSRR | 90dB @ 1kHz, 70dB @ 10kHz - suppresses switching noise from PMICs or DC-DC converters feeding the LDO input. |
| Output Noise | 10µVrms (10Hz–100kHz) - enables clean power for analog circuits like ADCs, VCOs, and camera ISPs. |
| Quiescent Current | 18µA typical - extends battery life in always-on wearable and IoT sensor nodes. |
| Dropout Voltage | 130–240mV @ 250mA - allows operation down to 1.93V input while maintaining 1.8V output under full load. |
| Enable Thresholds | VEN(H) ≥ 1.2V, VEN(L) ≤ 0.4V - compatible with 1.8V/3.3V GPIO without level-shifting. |
Pinout & Package
AP7353-18FS4-7 uses the X2-DFN1010-4 (Type B) 1.0mm × 1.0mm, 0.65mm pitch, 4-terminal surface-mount package with exposed thermal pad (EP). The package supports high-density PCB layouts and provides θJA = 237°C/W on JEDEC-standard board.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN (Pin 4) | Power Input | Accepts 2.0–5.5V input; requires local 1µF ceramic decoupling placed adjacent to minimize impedance. |
| EN (Pin 3) | Enable Control | Active-high logic input; must be driven - floating state disables regulator; 0.1µA standby leakage when pulled low. |
| GND (Pin 2) | Ground Reference | Primary return path for input/output currents; connects to PCB ground plane for stability and thermal conduction. |
| OUT (Pin 1) | Regulated Output | Delivers 1.8V ±1%; requires 1µF X7R/X5R ceramic capacitor within 2mm of pin for stability and transient response. |
| EP (Exposed Pad) | Thermal & Electrical Ground | Not electrically functional as GND electrode alone; must be soldered to large copper area tied to system GND for thermal dissipation. |
Key Features
| Feature | Design Value |
|---|---|
| High PSRR at RF frequencies | 70dB @ 10kHz enables clean power delivery to 2.4GHz Wi-Fi/BT transceivers without additional filtering. |
| Ultra-low output noise | 10µVrms eliminates need for post-LDO LC filtering in sensitive analog signal chains. |
| Low-quiescent-current operation | 18µA typical draw preserves battery runtime in always-on sensor monitoring modes. |
| Fast load transient response | <20µs recovery from 1mA↔250mA load steps prevents brownout in burst-mode processors. |
| Robust protection suite | Integrated thermal shutdown and 350mA short-circuit current limit prevent damage during fault conditions. |
Applications
| Smartphone Camera Module | Wi-Fi 6/Bluetooth LE RF Supply |
|---|---|
|
Use Scenario: Powering image signal processor (ISP) and CIS analog front-end requiring ultra-low-noise 1.8V rail. IC Role / Device Role / Timing Role: Primary low-noise LDO delivering regulated 1.8V to analog pixel array and ADC reference circuitry. Use Value: 10µVrms noise prevents fixed-pattern noise and SNR degradation in high-resolution imaging. |
Use Scenario: Supplying 1.8V VDDIO for dual-band Wi-Fi 6 and Bluetooth LE transceivers in portable hotspots. IC Role / Device Role / Timing Role: Post-regulator for clean RF core power, rejecting noise from shared 3.3V buck converter. Use Value: 90dB PSRR at 1kHz suppresses switching ripple from upstream DC-DC, preventing EVM degradation. |
| Wearable Heart Rate Sensor | Portable Media Player Audio Codec |
|
Use Scenario: Providing stable 1.8V bias to optical PPG sensor and analog front-end in battery-constrained wearables. IC Role / Device Role / Timing Role: Always-on LDO powering photodiode amplifier and transimpedance stage during continuous monitoring. Use Value: 18µA quiescent current extends 7-day battery life without compromising analog measurement fidelity. |
Use Scenario: Supplying 1.8V AVDD to stereo audio DAC/ADC in portable media players with flash storage and display. IC Role / Device Role / Timing Role: Low-noise analog supply isolating audio conversion circuitry from noisy digital subsystems. Use Value: ±1% output accuracy and ±30ppm/°C drift ensure consistent THD+N performance across operating temperature range. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Torex XC6210B182MR-G | Same 1.8V output, 200mA rating, 25µA IQ, but only 65dB PSRR @ 1kHz and no enable pin. | Lacks active enable control and delivers lower PSRR - unsuitable for RF-sensitive designs requiring dynamic power gating. | Select only if enable functionality and >85dB PSRR are not required and board space permits larger 1.2×1.2mm DFN package. |
| Richtek RT9013-18GB | 1.8V output, 300mA rating, 25µA IQ, 75dB PSRR @ 1kHz, integrated soft-start, but 200mV min dropout at 250mA. | Higher dropout limits usable input range; soft-start adds delay but reduces inrush - beneficial for systems with strict inrush limits. | Prefer when higher current headroom is needed and input voltage margin exceeds 200mV above 1.8V. |
Compared with XC6210B182MR-G and RT9013-18GB, AP7353-18FS4-7 uniquely combines 250mA capability, 90dB PSRR, sub-20µA IQ, and enable control in a 1.0mm × 1.0mm footprint - making it optimal for space-constrained, noise-sensitive, battery-powered RF and imaging applications.
Availability
AP7353-18FS4-7 is available at Aetrix Electronics and suitable for smartphone camera modules, Wi-Fi 6 RF supplies, and wearable biosensor systems requiring stable component supply, long-term lifecycle support, and RoHS-compliant green packaging.
Supply support for AP7353-18FS4-7 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-performance power management, signal integrity, and protection solutions for consumer, industrial, and communications markets.
The AP7353 series belongs to Diodes' precision LDO portfolio, engineered specifically for noise-critical portable electronics where PSRR, output accuracy, and ultra-low IQ directly impact battery life and signal integrity.
FAQ
What is the minimum input voltage required to maintain 1.8V output at 250mA?
The AP7353-18FS4-7 requires VIN ≥ 1.93V to sustain 1.8V output at 250mA, based on its maximum dropout voltage of 240mV (typical 130mV) in the X2-DFN1010-4 package. Below this threshold, output voltage drops proportionally, and regulation is lost.
Can the EN pin be left unconnected or tied to IN?
No - the EN pin must never be left floating. If enable functionality is unused, tie EN directly to IN to ensure permanent activation. Floating EN causes undefined behavior and may result in erratic output or increased quiescent current due to internal leakage paths.
Is an external output capacitor mandatory, and what type is recommended?
Yes - a minimum 0.7µF ceramic capacitor is required for stability, with 1µF X7R or X5R strongly recommended. The capacitor must be placed within 2mm of OUT and GND pins; ESR must remain below 2Ω to avoid oscillation or degraded transient response.
Does AP7353-18FS4-7 include output discharge functionality?
No - AP7353-18FS4-7 is the non-discharge variant (no "D" suffix). When disabled via EN, the output remains high-impedance and retains charge on downstream capacitance. For active discharge, select AP7353D-18FS4-7, which integrates a 35Ω pull-down FET between OUT and GND.
AP7353-18FS4-7 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):
- 1.8V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 0.24V @ 250mA
- Current - Output:
- 250mA
- Current - Quiescent (Iq):
- 27 µA
- Current - Supply (Max):
- -
- PSRR:
- 90dB ~ 70dB (100Hz ~ 10kHz)
- Control Features:
- Enable
- Protection Features:
- Over Current, Over Temperature
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- X2-DFN1010-4 (Type B)
AP7353-18FS4-7 FAQ
1.How can I place an order for AP7353-18FS4-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AP7353-18FS4-7 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 AP7353-18FS4-7 reliable?
The price and inventory of AP7353-18FS4-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP7353-18FS4-7 is usually 5 days.
3.What payment methods are accepted for AP7353-18FS4-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP7353-18FS4-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP7353-18FS4-7?
AP7353-18FS4-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP7353-18FS4-7 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 AP7353-18FS4-7?
For technical support, including AP7353-18FS4-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP7353-18FS4-7 requirements.
6.How does Aetrix verify that AP7353-18FS4-7 is sourced from the original manufacturer or authorized distributors?
All AP7353-18FS4-7 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 AP7353-18FS4-7 meets industry standards.
7.What is the process for return or replacement of AP7353-18FS4-7?
All AP7353-18FS4-7 units undergo pre-shipment inspection (PSI). If there is an issue with AP7353-18FS4-7, 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 AP7353-18FS4-7 part is unused and in its original packaging.
Return procedure for AP7353-18FS4-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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