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

Diodes Incorporated AP7353D-29FS4-7

Name: AP7353D-29FS4-7
Brand: Diodes Incorporated
SKU: AP7353D-29FS4-7
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: AP7353D-29FS4-7

Manufacturer:: Diodes Incorporated

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

Package:: 4-XDFN Exposed Pad

Datasheet:: AP7353D-29FS4-7.pdf

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

Quantity:: RFQ Add To RFQ list

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Inventory:2,250

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Product details

Overview

AP7353D-29FS4-7 from Diodes Incorporated is a 250mA low-dropout linear regulator with fixed 2.9V output, high PSRR (90dB at 1kHz), ultra-low output noise (10µV_rms), ±1% output voltage accuracy, and enable-controlled operation in X2-DFN1010-4 (Type B) package. It delivers stable power to noise-sensitive RF circuitry and portable media subsystems where quiescent current as low as 18µA and fast load transient response are critical.

For engineers reviewing the AP7353D-29FS4-7 datasheet, AP7353D-29FS4-7 pinout, AP7353D-29FS4-7 application, or AP7353D-29FS4-7 equivalent, key selection criteria include dropout voltage at 250mA (71–150mV), thermal resistance (θ_JA = 237°C/W), EN input thresholds (0.0–0.4V low, 1.2–5.5V high), and compatibility with 1µF ceramic output capacitors.

Technical Context

The AP7353D integrates a CMOS-based error amplifier, precision voltage reference, current-limit circuit, and thermal shutdown protection. Its architecture supports auto-discharge functionality via an internal 35Ω N-channel MOSFET when disabled, ensuring rapid output voltage decay for system-level sequencing.

It operates across 2.0V–5.5V input range and maintains regulation down to 71mV dropout at 250mA for V_OUT = 2.9V. The device achieves 90dB PSRR at 1kHz and 70dB at 10kHz under full load, enabling clean supply rails for RF transceivers and high-resolution ADCs without external filtering.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Voltage	Fixed 2.9V ±1% - ensures precise biasing for 2.85–2.95V logic or analog rails without external feedback.
Max Output Current	250mA - sufficient to power baseband processors, camera ISPs, or dual-band RF front-ends.
PSRR	90dB @ 1kHz, 70dB @ 10kHz - suppresses switching noise from DC/DC converters feeding the LDO input.
Output Noise	10µV_rms (10Hz–100kHz) - avoids phase noise degradation in local oscillators and PLLs.
Quiescent Current	18µA typical - extends battery life in always-on wearable sensors and Bluetooth LE peripherals.
Dropout Voltage	71–150mV @ 250mA - enables operation from single-cell Li-ion (3.0V min) or 3.3V rail with margin.
Enable Thresholds	V_IL ≤ 0.4V, V_IH ≥ 1.2V - compatible with 1.8V/3.3V GPIO 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 Power Output	Delivers 2.9V to load; requires 1µF ceramic capacitor placed adjacent to minimize ESR-induced instability.
2: GND	Ground Reference	Primary return path for output current and internal circuitry; must connect directly to low-impedance ground plane.
3: EN	Enable Control Input	Active-high logic input; floating state prohibited; ties to VIN for permanent enable or microcontroller GPIO for dynamic control.
4: IN	Unregulated Input Supply	Accepts 2.0–5.5V; requires 1µF ceramic decoupling capacitor near pin to suppress input ripple and transient spikes.
EP	Exposed Thermal Pad	Not electrically functional; must be soldered to large copper area connected to GND for optimal thermal dissipation (θ_JA = 237°C/W).

Key Features

Feature	Design Value
Auto-discharge function	35Ω internal NMOS discharges output capacitor on disable, preventing hold-up voltage that interferes with power sequencing.
Ultra-low noise output	10µV_rms over 10Hz–100kHz band enables direct powering of RF synthesizers without additional LC filtering.
High PSRR at 10kHz	70dB rejection at 10kHz allows co-location with high-frequency buck converters without cross-coupling into sensitive analog blocks.
Low quiescent current	18µA typical draw preserves battery capacity in standby modes of IoT edge nodes and hearables.
Stable with 1µF ceramic C_OUT	Eliminates need for larger tantalum or polymer capacitors, reducing BOM cost and PCB area in space-constrained wearables.

Applications

RF Power Amplifier Bias

Camera Image Signal Processor

Use Scenario: Supplies clean 2.9V bias to GaAs pHEMT PA stages in 5G NR sub-6GHz modules.

IC Role / Device Role / Timing Role: Low-noise LDO providing regulated V_CC to PA drain, rejecting switching noise from PMIC buck stages.

Use Value: 10µV_rms noise prevents AM-to-PM conversion and EVM degradation; 90dB PSRR isolates PA from digital supply coupling.

Use Scenario: Powers ISP core and ADC interface in smartphone multi-camera systems.

IC Role / Device Role / Timing Role: Primary 2.9V supply for image processing pipeline requiring stable voltage during burst capture.

Use Value: 250mA capability supports peak ISP loads; ±1% accuracy ensures consistent ADC reference scaling across temperature.

Bluetooth LE Audio Transceiver

Wearable Sensor Hub

Use Scenario: Delivers regulated 2.9V to dual-mode BT5.3/LE Audio SoC in true wireless stereo earbuds.

IC Role / Device Role / Timing Role: Always-on LDO supplying radio PHY and DSP cores during low-power listening mode.

Use Value: 18µA quiescent current extends battery runtime between charges; fast load transient response maintains V_OUT during packet transmission bursts.

Use Scenario: Powers inertial measurement unit (IMU), optical heart-rate sensor, and BLE controller in fitness bands.

IC Role / Device Role / Timing Role: Single-supply source for mixed-signal sensor fusion engine operating across -40°C to +85°C ambient.

Use Value: ±30ppm/°C tempco ensures stable sensor bias over operating range; 2.0–5.5V input supports direct Li-ion or USB charging input.

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	250mA, 2.9V, 6µV_rms noise, but only 60dB PSRR @ 1kHz and no auto-discharge.	Lacks discharge path; unsuitable for systems requiring controlled V_OUT ramp-down during sleep transitions.	Prefer when lowest noise dominates and sequencing is handled externally.
Torex XC6210B292MR-G	200mA, 2.9V, 12µV_rms, 85dB PSRR @ 1kHz, no discharge, 2.5V min input.	Lower current rating limits use in multi-core sensor hubs; higher dropout reduces usable input headroom.	Select only if footprint compatibility with Torex's SOT-25 is mandatory and 200mA suffices.

Compared with MCP1703T-2902E/MB and XC6210B292MR-G, AP7353D-29FS4-7 uniquely combines 250mA drive, 90dB PSRR, 10µV_rms noise, and integrated discharge in a 1.0×1.0mm DFN-making it optimal for compact, high-performance RF and imaging subsystems demanding full-feature integration.

Availability

AP7353D-29FS4-7 is available at Aetrix Electronics and suitable for RF power amplifier bias, camera image signal processor supplies, Bluetooth LE audio transceivers, and wearable sensor hubs requiring stable component supply with guaranteed long-term manufacturability.

Supply support for AP7353D-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 semiconductor company specializing in discrete, analog, and mixed-signal ICs, with design centers across Asia, Europe, and the US, serving automotive, industrial, computing, and consumer markets.

The AP7353 series targets portable and battery-powered electronics needing ultra-low-noise, high-PSRR, and enable-controlled power regulation-specifically engineered for smartphones, wearables, and wireless communication devices where size, efficiency, and signal integrity are critical.

FAQ

What is the maximum allowable input voltage for AP7353D-29FS4-7?

The absolute maximum input voltage is 6.0V per the datasheet. However, recommended operation is limited to 2.0V–5.5V. Exceeding 5.5V risks permanent damage even briefly, and operation above 5.5V voids reliability guarantees. For 4.7V output variants, VIN is specified up to 5.5V; for 2.9V output, 5.5V remains the safe upper limit with adequate headroom.

Does AP7353D-29FS4-7 require an external discharge resistor?

No. The "D" suffix denotes built-in auto-discharge functionality via a 35Ω internal NMOS transistor between OUT and GND. When EN is pulled low, this path actively discharges the output capacitor, eliminating need for external components. This feature is confirmed in the Electrical Characteristics table (On Resistance of N-Channel for Auto-Discharge = 35Ω).

Can AP7353D-29FS4-7 operate with a 0.7µF output capacitor?

Yes-the minimum effective capacitance is 0.7µF, accounting for derating due to temperature, DC bias, and tolerance. However, Diodes recommends 1µF X7R/X5R ceramic for robust stability across all conditions. Using 0.7µF may reduce phase margin marginally and increase susceptibility to layout-induced oscillation in marginal designs.

Is the exposed pad (EP) of AP7353D-29FS4-7 electrically connected?

No-the EP is a thermal pad only, not internally connected to any circuit node. Per the Pin Descriptions section, it should be connected to GND for thermal performance but must not serve as the sole GND electrode. PCB layout must provide separate GND connections to pin 2 (GND) and tie the EP to the same ground plane using multiple vias.

AP7353D-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)

AP7353D-29FS4-7 FAQ

1.How can I place an order for AP7353D-29FS4-7 through Aetrix?

Please submit a Request for Quotation (RFQ) for AP7353D-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 AP7353D-29FS4-7 reliable?

The price and inventory of AP7353D-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 AP7353D-29FS4-7 is usually 5 days.

3.What payment methods are accepted for AP7353D-29FS4-7?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP7353D-29FS4-7 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for AP7353D-29FS4-7?

AP7353D-29FS4-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your AP7353D-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 AP7353D-29FS4-7?

For technical support, including AP7353D-29FS4-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP7353D-29FS4-7 requirements.

6.How does Aetrix verify that AP7353D-29FS4-7 is sourced from the original manufacturer or authorized distributors?

All AP7353D-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 AP7353D-29FS4-7 meets industry standards.

7.What is the process for return or replacement of AP7353D-29FS4-7?

All AP7353D-29FS4-7 units undergo pre-shipment inspection (PSI). If there is an issue with AP7353D-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 AP7353D-29FS4-7 part is unused and in its original packaging.

Return procedure for AP7353D-29FS4-7:

1.Submit a request within 90 days.

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

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