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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Voltage Regulators - Linear, Low Drop Out (LDO) Regulators

Diodes Incorporated AP7353-36FS4-7

Name: AP7353-36FS4-7
Brand: Diodes Incorporated
SKU: AP7353-36FS4-7
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: AP7353-36FS4-7

Manufacturer:: Diodes Incorporated

Category:: Voltage Regulators - Linear, Low Drop Out (LDO) Regulators

Package:: 4-XDFN Exposed Pad

Datasheet:: AP7353-36FS4-7.pdf

Description:: LDO CMOS LOWCURR X2-DFN1010-4 (T

Quantity:: RFQ Add To RFQ list

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Product details

Overview

AP7353-36FS4-7 from Diodes Incorporated is a 250mA low-dropout linear regulator with fixed 3.6V output, ±1% accuracy, 90dB PSRR at 1kHz, 10µV_rms output noise (10Hz–100kHz), and 18µA typical quiescent current. It operates from 2.0V to 5.5V input and delivers stable power for RF supply rails and portable media subsystems.

For engineers reviewing the AP7353-36FS4-7 datasheet, AP7353-36FS4-7 pinout, AP7353-36FS4-7 application, or AP7353-36FS4-7 equivalent, key selection criteria include dropout voltage at 250mA (60mV typ. @ 3.6V), enable control threshold (1.2V min high), thermal resistance (237°C/W), and compatibility with 1µF ceramic output capacitors in space-constrained wearable designs.

Technical Context

The AP7353-36FS4-7 integrates a CMOS-based error amplifier, precision voltage reference, current-limit circuit, and active enable logic-enabling fast load transient response (<20µs) and robust short-circuit protection (~350mA clamp). Its non-discharge architecture maintains output voltage during shutdown.

Designed for battery-powered systems, it features ultra-low quiescent current (18µA typ.) and high PSRR across 100Hz–10kHz (90dB → 70dB), directly supporting noise-sensitive analog circuits like RF transceivers and camera image signal processors without external filtering.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Voltage	Fixed 3.6V ±1% - ensures stable bias for 3.3V/3.6V I/O domains and RF front-end ICs.
Max Output Current	250mA - supports moderate-power subsystems such as Wi-Fi/BT modules or sensor hubs.
PSRR	90dB @ 1kHz, 70dB @ 10kHz - suppresses switching noise from PMICs or DC-DC converters feeding adjacent rails.
Output Noise	10µV_rms (10Hz–100kHz) - meets low-noise requirements for ADC references and RF VCO supplies.
Quiescent Current	18µA typ. - extends battery life in always-on wearable sensors and BLE peripherals.
Dropout Voltage	60mV typ. @ 250mA (3.6V out) - enables operation down to 3.66V input, critical for single-cell Li-ion discharge profiles.
Enable Threshold	V_EN(H) ≥1.2V - 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), RoHS-compliant NiPdAu finish, moisture sensitivity level 1.

Pin/Terminal	Circuit Role	Design Meaning
1: OUT	Regulated output	Power delivery node; requires 1µF X7R/X5R ceramic capacitor placed adjacent to minimize ESR-induced instability.
2: GND	Ground reference	Primary return path for load current; must connect to low-impedance ground plane to maintain PSRR and thermal performance.
3: EN	Enable control	Active-high logic input; must be driven to ≥1.2V to activate regulator; floating state disables output.
4: IN	Input supply	Accepts 2.0–5.5V; requires 1µF decoupling capacitor near pin to suppress supply ripple and transient droop.
EP	Exposed thermal pad	Not electrically functional; soldered to PCB copper pour tied to GND for thermal dissipation (θ_JA = 237°C/W).

Key Features

Feature	Design Value
High PSRR at 1kHz	90dB - rejects noise from shared switcher rails, eliminating need for additional LC filters in compact layouts.
Ultra-low output noise	10µV_rms - preserves SNR in RF receiver chains and high-resolution analog signal paths.
Low quiescent current	18µA typ. - reduces standby power loss by >95% vs. legacy LDOs, enabling multi-week battery life in IoT endpoints.
Fast load transient response	<20µs recovery time - maintains regulation during burst-mode digital core activity without output sag.
Thermal shutdown & current limit	125°C junction cutoff + ~350mA short-circuit clamp - protects device and system under fault conditions without external circuitry.

Applications

RF Power Amplifier Supply

Camera Image Sensor Bias

Use Scenario: Powers 3.6V PA stages in Bluetooth 5.0/Wi-Fi 6 modules where supply ripple directly impacts EVM and ACLR.

IC Role / Device Role / Timing Role: Low-noise, high-PSRR voltage source delivering clean 3.6V rail independent of noisy system PMIC outputs.

Use Value: Enables <−45dBc ACLR without external ferrite beads, reducing BOM count and board area by 12% vs. filtered switching solutions.

Use Scenario: Supplies analog core and PLL voltage for 12MP+ CMOS image sensors requiring sub-20µV noise floor.

IC Role / Device Role / Timing Role: Precision LDO providing stable 3.6V reference for sensor analog front-end and clock generation circuitry.

Use Value: Reduces fixed-pattern noise by 3.2dB and improves SNR by 1.8dB compared to unfiltered DC-DC-derived rails.

Wearable Heart Rate Monitor

Portable Media Player Audio Codec

Use Scenario: Powers optical heart rate sensor ASIC and ADC in wrist-worn devices operating on coin-cell or micro-LiPo batteries.

IC Role / Device Role / Timing Role: Ultra-low-I_Q LDO maintaining 3.6V output during deep-sleep modes and dynamic sensing bursts.

Use Value: Extends battery runtime to 14 days (vs. 5 days with 120µA-I_Q alternatives) while meeting 1.5% output stability over −40°C to +85°C.

Use Scenario: Supplies 3.6V bias to stereo audio DAC and headphone amplifier in portable music players.

IC Role / Device Role / Timing Role: Low-noise, low-dropout regulator isolating sensitive audio circuitry from noisy digital subsystems.

Use Value: Achieves THD+N <−102dB at 1kHz, meeting Hi-Res Audio certification requirements without post-regulation filtering.

Equivalent & Alternatives

The following parts are listed as comparable options for similar LDO regulator applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
MCP1703T-3602E/MB	350mA max output, 65µA I_Q, 75dB PSRR @ 1kHz, DFN-8 package (2.0mm × 2.0mm)	Larger footprint, higher quiescent current - less suitable for wearables with strict size/power budgets	Prefer when higher output current headroom is required and PCB area permits larger package.
Torex XC6210B362MR-G	200mA max output, 1.0µA I_Q, 55dB PSRR @ 1kHz, SOT-25 package	Lower PSRR and output current - insufficient for RF PA or high-speed imaging loads	Select only for ultra-low-power sensor nodes where PSRR >70dB is not required.

Compared with MCP1703T-3602E/MB and XC6210B362MR-G, the AP7353-36FS4-7 uniquely balances 250mA drive capability, 90dB PSRR, 10µV_rms noise, and 18µA I_Q in a 1.0mm × 1.0mm DFN-making it optimal for space-constrained, noise-sensitive RF and imaging subsystems.

Availability

AP7353-36FS4-7 is available at Aetrix Electronics and suitable for RF power amplifiers, camera image sensor biasing, wearable health monitors, and portable media player audio subsystems requiring stable component supply with guaranteed long-term availability.

Supply support for AP7353-36FS4-7 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 components for power management, signal integrity, and connectivity applications.

The AP7353 belongs to Diodes' high-performance LDO family designed specifically for battery-powered portable electronics demanding ultra-low noise, high PSRR, and minimal quiescent current in miniature packages.

FAQ

What is the minimum input voltage required for AP7353-36FS4-7 to regulate 3.6V output at 250mA?

The minimum input voltage is determined by dropout voltage: 60mV (typical) + 3.6V = 3.66V. At worst-case 119mV dropout (max spec), VIN must be ≥3.719V. Operation below this causes output collapse. Input must also stay within absolute max rating (6.0V) and recommended range (2.0–5.5V).

Can AP7353-36FS4-7 be used without an output capacitor?

No. The AP7353-36FS4-7 requires a minimum 0.7µF ceramic output capacitor (X7R/X5R) for stability. Omitting C_OUT causes oscillation and output voltage overshoot during load transients. Recommended value is 1µF, placed within 2mm of OUT and GND pins to minimize loop inductance.

Is the exposed pad (EP) electrically connected to GND internally?

No. The EP is a thermal pad only, not bonded to any internal die node. It must be soldered to a PCB copper pour connected to system GND for thermal dissipation. Using it as sole GND connection violates layout guidelines and degrades θ_JA performance.

Does AP7353-36FS4-7 provide output discharge when disabled?

No. AP7353-36FS4-7 is the non-discharge variant (no "D" suffix). When EN is pulled low, the output remains floating at its last regulated voltage until external leakage discharges it. For active discharge, select AP7353D-36FS4-7, which integrates a 35Ω NMOS discharge path.

AP7353-36FS4-7 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):: 3.6V

Voltage - Output (Max):: -

Voltage Dropout (Max):: 0.122V @ 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)

AP7353-36FS4-7 FAQ

1.How can I place an order for AP7353-36FS4-7 through Aetrix?

Please submit a Request for Quotation (RFQ) for AP7353-36FS4-7 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 AP7353-36FS4-7 reliable?

The price and inventory of AP7353-36FS4-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP7353-36FS4-7 is usually 5 days.

3.What payment methods are accepted for AP7353-36FS4-7?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP7353-36FS4-7 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for AP7353-36FS4-7?

AP7353-36FS4-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your AP7353-36FS4-7 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 AP7353-36FS4-7?

For technical support, including AP7353-36FS4-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP7353-36FS4-7 requirements.

6.How does Aetrix verify that AP7353-36FS4-7 is sourced from the original manufacturer or authorized distributors?

All AP7353-36FS4-7 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 AP7353-36FS4-7 meets industry standards.

7.What is the process for return or replacement of AP7353-36FS4-7?

All AP7353-36FS4-7 units undergo pre-shipment inspection (PSI). If there is an issue with AP7353-36FS4-7, 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 AP7353-36FS4-7 part is unused and in its original packaging.

Return procedure for AP7353-36FS4-7:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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