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

Diodes Incorporated AP7347D-29W5-7

Name: AP7347D-29W5-7
Brand: Diodes Incorporated
SKU: AP7347D-29W5-7
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: AP7347D-29W5-7

Manufacturer:: Diodes Incorporated

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

Package:: 6-WDFN Exposed Pad

Datasheet:: AP7347D-29W5-7.pdf

Description:: LDO CMOS LOWCURR SOT25 T&R 3K

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Product details

Overview

AP7347D-29W5-7 from Diodes Incorporated is a 2.9V fixed-output, 500mA low-dropout linear regulator with ±1% output voltage accuracy, 75dB PSRR at 1kHz, and 60µV_rms output noise (10Hz–100kHz). Built on CMOS process, it features enable control, thermal shutdown, short-circuit protection, and auto-discharge functionality. It powers noise-sensitive analog rails in automotive infotainment modules.

For engineers reviewing the AP7347D-29W5-7 datasheet, AP7347D-29W5-7 pinout, AP7347D-29W5-7 application, or AP7347D-29W5-7 equivalent, key selection criteria include dropout voltage at 500mA (0.27–0.32V for 2.9V output), quiescent current (60µA typ), EN logic thresholds (0.5V_IL/1.25V_IH), and SOT25 thermal resistance (θ_JA = 140°C/W).

Technical Context

The AP7347D-29W5-7 integrates a precision voltage reference, error amplifier, current-limit circuit, and NMOS pass transistor with auto-discharge path. Its CMOS architecture enables ultra-low quiescent current (60µA) while maintaining fast load transient response (<200µs settling) and high PSRR across 10Hz–1MHz.

It operates over 1.7V–5.5V input range and delivers stable 2.9V output with ±1% accuracy from –40°C to +125°C ambient. Thermal shutdown triggers at +170°C with +20°C hysteresis, and short-circuit foldback limits output current to ~180mA during V_OUT–GND fault.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Voltage	Fixed 2.9V ±1% - ensures stable supply for 2.8V–3.0V logic I/O or analog sensor biasing without external feedback.
Max Output Current	500mA - supports single-rail power for microcontrollers, ADCs, or RF front-ends in compact portable systems.
Dropout Voltage	0.27–0.32V @ 500mA - enables operation from 3.17V input, critical for battery-powered systems near end-of-life.
PSRR	75dB @ 1kHz - suppresses switching noise from upstream DC/DC converters feeding sensitive analog circuits.
Output Noise	60µV_rms (10Hz–100kHz) - meets low-noise requirements for audio codecs, precision ADC references, and RF synthesizers.
Quiescent Current	60µA typ - extends battery life in always-on monitoring nodes and IoT edge sensors.
Enable Thresholds	V_IL ≤ 0.5V, V_IH ≥ 1.25V - compatible with 1.8V/3.3V GPIOs for precise power sequencing control.

Pinout & Package

SOT25 (Type A1) package: 5-pin surface-mount with exposed pad not present; footprint optimized for thermal performance on 1oz copper PCBs. Pin 4 is NC (no internal connection); recommended tied to GND for thermal relief.

Pin/Terminal	Circuit Role	Design Meaning
1 (VIN)	Input Power Supply	Accepts 1.7–5.5V; requires 1µF ceramic decoupling capacitor placed adjacent to minimize input impedance.
2 (EN)	Enable Control Input	Active-high logic: drives regulator ON when ≥1.25V, OFF when ≤0.5V; must not float-tie to VIN if unused.
3 (GND)	Ground Reference	Primary return path for input/output currents; connect directly to low-impedance ground plane to reduce noise coupling.
4 (NC)	No Connect	Not bonded internally; PCB trace should connect to GND to enhance thermal dissipation and EMI shielding.
5 (VOUT)	Regulated Output	Delivers 2.9V ±1%; requires 1µF ceramic output capacitor placed within 2mm of pin for stability and transient response.

Key Features

Feature	Design Value
High PSRR (75dB @ 1kHz)	Rejects ripple from noisy buck converters, enabling clean analog supply without additional filtering stages.
Auto-Discharge Path (30Ω)	Drains output capacitance when disabled, preventing hold-up voltage that could delay system reset or cause latch-up.
Low-Noise (60µV_rms)	Eliminates need for post-LDO RC filters in precision signal chains, reducing BOM count and board area.
Thermal Shutdown (+170°C)	Protects against sustained overload or poor heatsinking; hysteresis prevents oscillation during recovery.
Wide Input Range (1.7–5.5V)	Supports direct Li-ion (3.0–4.2V), USB (4.75–5.25V), and dual-cell alkaline (2.4–3.2V) inputs without pre-regulation.

Applications

Automotive Infotainment

Portable Medical Sensors

Use Scenario: Powering audio DACs and touch controller ICs in head unit displays.

IC Role / Device Role / Timing Role: Primary 2.9V analog rail LDO supplying low-noise bias for Class-D amplifier inputs and capacitive touch sensing.

Use Value: 60µV_rms noise prevents audible hiss; 75dB PSRR blocks switching noise from 2MHz DC/DC converter powering digital SoC.

Use Scenario: Regulating supply for ECG front-end amplifiers and 16-bit SAR ADCs in handheld monitors.

IC Role / Device Role / Timing Role: Precision analog domain LDO delivering stable 2.9V reference for signal conditioning and conversion stages.

Use Value: ±1% output accuracy maintains ADC full-scale linearity; 500mA capacity supports simultaneous sensor excitation and data transmission.

Industrial PLC I/O Modules

Wireless Edge Node Controllers

Use Scenario: Providing isolated 2.9V supply for RS-485 transceivers and optocoupler drivers.

IC Role / Device Role / Timing Role: Secondary LDO after isolated DC/DC, ensuring clean interface voltage immune to field-side ground bounce.

Use Value: 0.27V dropout allows operation from 3.17V isolated rail; EN pin enables remote power cycling during communication faults.

Use Scenario: Powering BLE SoC (e.g., nRF52840) and environmental sensors in battery-operated gateways.

IC Role / Device Role / Timing Role: Always-on LDO for real-time clock and wake-up circuitry, with ultra-low 60µA IQ preserving battery life.

Use Value: 60µA quiescent current extends 2×AA battery life to >5 years in sleep mode; auto-discharge prevents false wake-ups.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
MCP1703T-2902E/MB	Higher dropout (0.6V @ 250mA), lower PSRR (60dB @ 1kHz), no auto-discharge	Lacks fast discharge path; unsuitable where rapid VOUT decay is required for sequencing	Select if cost sensitivity outweighs need for low-noise, low-dropout, or discharge functionality
Torex XC6210B292MR-G	Lower max current (300mA), higher IQ (1.2µA typ), same 2.9V output and ±1% accuracy	Insufficient for 500mA loads like multi-sensor hubs or high-speed transceivers	Choose only for sub-300mA applications where ultra-low IQ is primary requirement

Compared with MCP1703T-2902E/MB and XC6210B292MR-G, the AP7347D-29W5-7 uniquely combines 500mA capability, 0.27V dropout, 75dB PSRR, and integrated auto-discharge-making it optimal for automotive and industrial systems requiring robust, low-noise, sequenced power delivery.

Availability

AP7347D-29W5-7 is available at Aetrix Electronics and suitable for automotive infotainment, portable medical sensors, industrial PLC I/O modules, and wireless edge node controllers requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for AP7347D-29W5-7 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 design centers in Asia, Europe, and the U.S., serving automotive, industrial, and consumer markets.

The AP7347D series belongs to Diodes' high-PSRR, low-noise LDO product line, engineered specifically for noise-sensitive applications in automotive electronics and portable instrumentation where precision regulation and fast transient response are critical.

FAQ

What is the maximum allowable input voltage for AP7347D-29W5-7?

The absolute maximum input voltage is 6.0V per the datasheet's Absolute Maximum Ratings. Continuous operation above 5.5V violates Recommended Operating Conditions and risks permanent damage. For reliable 2.9V output, VIN must remain between 1.7V and 5.5V, with minimum headroom of 0.27V at 500mA load to maintain regulation.

Does AP7347D-29W5-7 require an external output capacitor, and what value is recommended?

Yes, a minimum 1.0µF ceramic capacitor is required between VOUT and GND for stability and transient response. The datasheet confirms compatibility with low-ESR ceramics and recommends placing it within 2mm of the VOUT and GND pins. Larger values (e.g., 10µF) may improve load step response but are not mandatory for basic operation.

How does the auto-discharge function operate, and what is its on-resistance?

When EN is pulled low, an internal 30Ω NMOS switch connects VOUT to GND, actively discharging output capacitance. This ensures rapid VOUT decay-critical for power sequencing and avoiding latch-up in downstream logic. The 30Ω value is specified under VIN = 4.0V and EN = 0V conditions, enabling predictable discharge time constants.

Is AP7347D-29W5-7 qualified for automotive applications?

The base AP7347D-29W5-7 is not AEC-Q200 qualified; however, Diodes offers the automotive-grade variant AP7347DQ-29W5-7, which undergoes extended temperature stress testing (–40°C to +125°C), HTOL, and ESD qualification per AEC-Q200 Rev D. For automotive designs, AP7347DQ must be specified explicitly.

AP7347D-29W5-7 Specifications

Product attributes: Attribute value

Manufacturer:: Diodes Incorporated

Series:: -

Package/Case:: 6-WDFN 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):: 0.36V @ 500mA

Current - Output:: 500mA

Current - Quiescent (Iq):: 125 µA

Current - Supply (Max):: -

PSRR:: 75dB (1kHz)

Control Features:: Current Limit, Enable

Protection Features:: Over Current, Over Temperature, Short Circuit, Under Voltage Lockout (UVLO)

Operating Temperature:: -40°C ~ 125°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount, Wettable Flank

Supplier Device Package:: W-DFN2020-6 (SWP) (Type A1)

AP7347D-29W5-7 FAQ

1.How can I place an order for AP7347D-29W5-7 through Aetrix?

Please submit a Request for Quotation (RFQ) for AP7347D-29W5-7 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 AP7347D-29W5-7 reliable?

The price and inventory of AP7347D-29W5-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP7347D-29W5-7 is usually 5 days.

3.What payment methods are accepted for AP7347D-29W5-7?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP7347D-29W5-7 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for AP7347D-29W5-7?

AP7347D-29W5-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your AP7347D-29W5-7 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 AP7347D-29W5-7?

For technical support, including AP7347D-29W5-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP7347D-29W5-7 requirements.

6.How does Aetrix verify that AP7347D-29W5-7 is sourced from the original manufacturer or authorized distributors?

All AP7347D-29W5-7 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 AP7347D-29W5-7 meets industry standards.

7.What is the process for return or replacement of AP7347D-29W5-7?

All AP7347D-29W5-7 units undergo pre-shipment inspection (PSI). If there is an issue with AP7347D-29W5-7, 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 AP7347D-29W5-7 part is unused and in its original packaging.

Return procedure for AP7347D-29W5-7:

1.Submit a request within 90 days.

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

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