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

Diodes Incorporated AP7353-29FS4-7

Name: AP7353-29FS4-7
Brand: Diodes Incorporated
SKU: AP7353-29FS4-7
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: AP7353-29FS4-7

Manufacturer:: Diodes Incorporated

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

Package:: 4-XDFN Exposed Pad

Datasheet:: AP7353-29FS4-7.pdf

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

Quantity:: RFQ Add To RFQ list

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Product details

Overview

AP7353-29FS4-7 from Diodes Incorporated is a 250mA low-dropout linear regulator with fixed 2.9V 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 to noise-sensitive RF and analog circuits in space-constrained portable devices.

For engineers reviewing the AP7353-29FS4-7 datasheet, AP7353-29FS4-7 pinout, AP7353-29FS4-7 application, or AP7353-29FS4-7 equivalent, key selection criteria include dropout voltage at 250mA (71mV typ. @ 2.9V), enable control threshold (1.2V high / 0.4V low), thermal resistance (237°C/W for X2-DFN1010-4), and compatibility with 1µF ceramic output capacitors.

Technical Context

The AP7353-29FS4-7 uses 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 features fast load transient response (<20µs settling for 1mA→250mA step) and robust line regulation (0.02%/V), enabled by low-R_DS(ON) pass transistor and optimized internal compensation. The device includes thermal shutdown and short-circuit protection (350mA clamp).

Key Specifications

Parameter	Value and Actual Design Meaning
Output Voltage	Fixed 2.9V ±1% - ensures precise biasing for 2.85V–2.95V-tolerant RF ICs and analog sensors
Max Output Current	250mA - supports moderate-power subsystems like camera ISPs or Bluetooth SoCs without external boost
PSRR	90dB @ 1kHz, 70dB @ 10kHz - suppresses switching noise from PMICs or DC-DC converters feeding adjacent rails
Output Noise	10µV_rms (10Hz–100kHz) - meets stringent requirements for ADC references and VCO supply rails
Quiescent Current	18µA typ. - extends battery life in always-on wearable sensors and BLE peripherals
Dropout Voltage	71mV typ. @ 250mA - enables operation down to 2.97V input, critical for single-cell Li-ion systems under load
Enable Threshold	V_EN(HI) = 1.2V min., V_EN(LO) = 0.4V max. - compatible with 1.8V/3.3V GPIOs without level-shifting

Pinout & Package

AP7353-29FS4-7 is packaged in the X2-DFN1010-4 (Type B) 1.0mm × 1.0mm, 0.4mm pitch, thermally enhanced leadless package with exposed pad (EP) for improved heat dissipation. PCB layout requires connection of EP to GND plane for optimal thermal performance.

Pin/Terminal	Circuit Role	Design Meaning
1: IN	Power Input	Accepts 2.0V–5.5V supply; requires local 1µF ceramic decoupling capacitor placed adjacent to pin
2: GND	Ground Reference	Primary return path for input/output currents; must connect directly to low-impedance ground plane
3: EN	Enable Control	Active-high logic input; floating state is undefined-must be tied high or low; 0.1µA standby leakage
4: OUT	Regulated Output	Delivers 2.9V ±1%; requires 1µF X7R/X5R ceramic capacitor within 2mm of pin for stability
EP	Thermal Pad	Not electrically functional; soldered to GND copper area to reduce θ_JA from 237°C/W to ~120°C/W

Key Features

Feature	Design Value
High PSRR at RF frequencies	70dB @ 10kHz enables clean power delivery to 2.4GHz transceivers without additional filtering
Ultra-low output noise	10µV_rms eliminates need for post-LDO LC filtering in precision analog signal chains
Low-quiescent-current shutdown	0.1µA standby current minimizes leakage in battery-backed real-time clock or sensor nodes
Fast load transient response	20µs recovery from 1mA→250mA step maintains voltage regulation during burst-mode wireless transmission
Robust protection suite	Integrated thermal shutdown and 350mA short-circuit current limit prevent damage during fault conditions

Applications

RF Power Amplifier Bias

Camera Image Signal Processor (ISP)

Use Scenario: Providing clean, low-noise bias to GaAs pHEMT or SiGe HBT PAs in Bluetooth/Wi-Fi modules.

IC Role / Device Role / Timing Role: Primary voltage regulator supplying PA drain voltage with minimal ripple-induced phase noise.

Use Value: 90dB PSRR at 1kHz suppresses switching artifacts from shared PMIC, improving EVM by >3dB.

Use Scenario: Powering analog front-end and ADC sections of mobile camera ISPs.

IC Role / Device Role / Timing Role: Low-noise 2.9V rail generator for pixel readout and correlated double sampling circuits.

Use Value: 10µV_rms noise prevents quantization errors in 12-bit+ image data paths.

Wearable Sensor Hub

BLE SoC Core Supply

Use Scenario: Regulating power for multi-axis IMU, HRM, and environmental sensor fusion processors.

IC Role / Device Role / Timing Role: Always-on LDO maintaining 2.9V for ultra-low-power MCU sleep states and wake-up triggers.

Use Value: 18µA quiescent current extends coin-cell battery life beyond 12 months in intermittent-sampling mode.

Use Scenario: Supplying core logic voltage to Nordic nRF52/nRF53 or TI CC26xx BLE SoCs.

IC Role / Device Role / Timing Role: Stable 2.9V source enabling 64MHz ARM Cortex-M4 operation with <1% supply variation.

Use Value: ±1% output accuracy ensures reliable flash programming and radio calibration across temperature.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
Torex XC6210B292MR-G	250mA, 2.9V, ±2% accuracy, 75dB PSRR @ 1kHz, 25µA I_Q	Higher output tolerance and lower PSRR reduce suitability for RF biasing	Prefer when cost sensitivity outweighs PSRR/noise requirements in non-RF sensor rails
Richtek RT9013-29GB	300mA, 2.9V, ±2% accuracy, 65dB PSRR @ 1kHz, 2.5µA I_Q (shutdown)	Lower quiescent current but significantly reduced PSRR compromises RF supply integrity	Choose only for ultra-low-power always-off applications where RF performance is secondary

Compared with XC6210B292MR-G and RT9013-29GB, AP7353-29FS4-7 uniquely balances 90dB PSRR, 10µV_rms noise, and 18µA I_Q-making it the only option qualified for simultaneous RF cleanliness and battery longevity in compact wearables.

Availability

AP7353-29FS4-7 is available at Aetrix Electronics and suitable for RF power amplifiers, camera ISPs, wearable sensor hubs, and BLE SoC core supplies requiring stable component supply, consistent parametric performance, and long-term production continuity.

Supply support for AP7353-29FS4-7 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 automotive markets.

The AP7353 series belongs to Diodes' high-PSRR, low-noise LDO product line, engineered specifically for noise-critical portable electronics where battery efficiency and RF immunity must coexist in sub-1mm² footprints.

FAQ

What is the recommended output capacitor for AP7353-29FS4-7?

A 1µF X7R or X5R ceramic capacitor placed within 2mm of the OUT and GND pins is required for stability and optimal transient response. The minimum effective capacitance is 0.7µF after accounting for DC bias and temperature derating; ESR must remain below 2Ω. Larger values improve load-step immunity but do not affect basic loop stability.

Does AP7353-29FS4-7 include output discharge functionality?

No. AP7353-29FS4-7 is the non-discharge variant (no "D" suffix). When disabled via EN pin, the output remains floating and retains its voltage on external capacitance. For active discharge, select AP7353D-29FS4-7, which integrates a 35Ω NMOS switch between OUT and GND.

Can AP7353-29FS4-7 operate with a 1.8V input supply?

No. The minimum input voltage is 2.0V per datasheet specifications. At 2.9V output, the absolute minimum input is 2.97V (71mV dropout + 2.9V) under 250mA load. Operation below 2.0V violates absolute maximum ratings and will cause regulation failure or thermal shutdown.

How does the exposed pad (EP) affect thermal performance?

The EP is a thermal-only pad with no electrical function. Soldering it to a ≥25mm² GND copper pour reduces junction-to-ambient thermal resistance from 237°C/W to approximately 120°C/W, enabling 250mA continuous operation at +85°C ambient without derating. Leaving it unconnected degrades thermal performance by >40%.

AP7353-29FS4-7 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):: 2.9V

Voltage - Output (Max):: -

Voltage Dropout (Max):: 0.153V @ 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)

AP7353-29FS4-7 FAQ

1.How can I place an order for AP7353-29FS4-7 through Aetrix?

Please submit a Request for Quotation (RFQ) for AP7353-29FS4-7 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 AP7353-29FS4-7 reliable?

The price and inventory of AP7353-29FS4-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP7353-29FS4-7 is usually 5 days.

3.What payment methods are accepted for AP7353-29FS4-7?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP7353-29FS4-7 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for AP7353-29FS4-7?

AP7353-29FS4-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your AP7353-29FS4-7 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 AP7353-29FS4-7?

For technical support, including AP7353-29FS4-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP7353-29FS4-7 requirements.

6.How does Aetrix verify that AP7353-29FS4-7 is sourced from the original manufacturer or authorized distributors?

All AP7353-29FS4-7 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 AP7353-29FS4-7 meets industry standards.

7.What is the process for return or replacement of AP7353-29FS4-7?

All AP7353-29FS4-7 units undergo pre-shipment inspection (PSI). If there is an issue with AP7353-29FS4-7, 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 AP7353-29FS4-7 part is unused and in its original packaging.

Return procedure for AP7353-29FS4-7:

1.Submit a request within 90 days.

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

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