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

Diodes Incorporated AP7340-28FS4-7

Name: AP7340-28FS4-7
Brand: Diodes Incorporated
SKU: AP7340-28FS4-7
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: AP7340-28FS4-7

Manufacturer:: Diodes Incorporated

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

Package:: 4-XDFN Exposed Pad

Datasheet:: AP7340-28FS4-7.pdf

Description:: IC REG LINEAR 2.8V 150MA 4DFN

Quantity:: RFQ Add To RFQ list

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Inventory:4,870

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Product details

Overview

AP7340-28FS4-7 from Diodes Incorporated is a fixed-output 2.8V, 150mA low-dropout linear regulator with ±1% output voltage accuracy, 75dB PSRR at 1kHz, and 60µV_RMS output noise (10Hz–100kHz). Built on a CMOS process, it features enable control, low 35µA quiescent current, and operates from 1.7V to 5.25V input - optimized for RF supply rails in portable wireless communication devices.

For engineers reviewing the AP7340-28FS4-7 datasheet, AP7340-28FS4-7 pinout, AP7340-28FS4-7 application, or AP7340-28FS4-7 equivalent, key selection criteria include dropout voltage at 150mA (0.21–0.27V), EN logic thresholds (0.5V_IL/1.3V_IH), thermal performance in X2-DFN1010-4, and compatibility with 0.47µF ceramic input/output capacitors.

Technical Context

The AP7340-28FS4-7 integrates a precision voltage reference, error amplifier, and current-limit circuit within a CMOS-based LDO architecture. Its non-discharge output stage avoids automatic VOUT discharge during shutdown, preserving downstream capacitor charge.

It delivers stable 2.8V regulation across –40°C to +85°C ambient, with line regulation ≤0.1%/V and load regulation ≤1.0%/A. The enable input accepts 0–5.25V logic levels and draws ≤1.0µA leakage, supporting low-power system sequencing.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Voltage	Fixed 2.8V ±1% at 25°C; ±1.5% over full temperature range - ensures stable bias for RF power amplifiers and analog sensor interfaces.
Max Output Current	150mA guaranteed - sufficient to power baseband processors, camera ISPs, or single-band RF transceivers without derating.
PSRR	75dB at 1kHz - suppresses switching noise from adjacent DC/DC converters feeding noisy system rails.
Output Noise	60µV_RMS (10Hz–100kHz) - minimizes phase noise degradation in VCOs and PLLs powered from this rail.
Quiescent Current	35µA typical - enables multi-day battery life in always-on sensor or standby-mode wireless peripherals.
Dropout Voltage	0.21–0.27V at 150mA - allows operation from single-cell Li-ion (3.0V min) or 3.3V rail with >0.5V headroom margin.
Input Voltage Range	1.7V to 5.25V - supports direct connection to USB VBUS, boost converter outputs, or wide-input PMIC domains.

Pinout & Package

The AP7340-28FS4-7 is housed in a 1.0mm × 1.0mm, 0.4mm height X2-DFN1010-4 package with exposed thermal pad. This ultra-compact lead-free RoHS-compliant package enables high-density PCB layouts in space-constrained mobile modules.

Pin/Terminal	Circuit Role	Design Meaning
VOUT (Pin 1)	Regulated power output	Delivers clean 2.8V to load; requires 0.47µF ceramic capacitor placed adjacent to pin for stability and transient response.
GND (Pin 2)	Power ground reference	Primary return path for load current; must connect directly to low-impedance ground plane to minimize noise coupling.
EN (Pin 3)	Enable control input	Active-high logic: ≥1.3V enables regulation; ≤0.5V disables output and reduces I_Q to 0.01µA - used for dynamic power gating.
VIN (Pin 4)	Unregulated input supply	Accepts 1.7–5.25V; requires 0.47µF decoupling capacitor near pin to suppress supply glitches and EMI.
Thermal Pad	Thermal dissipation node	Not electrically functional; must be soldered to large copper area tied to GND for 400mW power dissipation capability.

Key Features

Feature	Design Value
High PSRR	75dB at 1kHz - maintains RF signal integrity by rejecting ripple from shared system power rails.
Ultra-low noise	60µV_RMS (10Hz–100kHz) - prevents amplitude modulation of sensitive analog front-ends in cameras and receivers.
Low quiescent current	35µA typical - extends battery runtime in always-on IoT sensors and wearable health monitors.
Precision output accuracy	±1% at 25°C, ±1.5% over –40°C to +85°C - eliminates need for external trimming in production calibration.
Wide input range	1.7V to 5.25V - accommodates aging batteries, USB-C PD negotiation, and multi-rail PMIC outputs without redesign.

Applications

RF Power Amplifier Bias

Camera Image Signal Processor (ISP)

Use Scenario: Providing clean, low-noise bias voltage to GaAs or SiGe RF power amplifiers in LTE/Wi-Fi front-end modules.

IC Role / Device Role / Timing Role: Primary LDO delivering regulated 2.8V rail with minimal phase noise contribution to transmit chain.

Use Value: 60µV_RMS noise and 75dB PSRR prevent AM-to-PM conversion and spectral regrowth in PA output.

Use Scenario: Powering analog pixel processing blocks and ADC reference buffers in smartphone camera modules.

IC Role / Device Role / Timing Role: Low-noise, fast-transient LDO supplying critical analog supply domain for image capture fidelity.

Use Value: ±1% output accuracy and <0.27V dropout ensure consistent analog gain and dynamic range across battery discharge.

Wireless Adapter Baseband

Portable Media Player Audio Codec

Use Scenario: Supplying core voltage to Bluetooth/Wi-Fi SoC baseband processors during active data transfer and sleep states.

IC Role / Device Role / Timing Role: Enable-controlled LDO enabling rapid power cycling of subsystems to meet Bluetooth LE duty-cycle requirements.

Use Value: 35µA quiescent current and 0.01µA shutdown current reduce average system power by >40% in idle mode.

Use Scenario: Delivering stable 2.8V to stereo audio DACs and headphone amplifiers in portable media players.

IC Role / Device Role / Timing Role: Low-noise analog supply LDO preventing audible hiss and distortion in high-SNR audio playback.

Use Value: 60µV_RMS noise floor remains below 120dB(A) audio reference, eliminating measurable background noise.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
MCP1700-2802E/TO	250mA rated, 6µA I_Q, but only 60dB PSRR at 1kHz and 120µV_RMS noise - higher noise compromises RF/analog performance.	Lacks enable pin; fixed ON/OFF via VIN only - unsuitable for dynamic power-gated systems.	Prefer AP7340-28FS4-7 where RF noise immunity or sequenced enable control is required.
Torex XC6206P282MR-G	150mA rated, ±2% accuracy, 45dB PSRR at 1kHz, 100µV_RMS noise - lower PSRR and higher noise limit use in sensitive analog rails.	Same XDFN-4 package but no thermal pad - limits continuous power handling to ~200mW vs. 400mW for AP7340.	Choose AP7340-28FS4-7 when thermal margin, PSRR, or noise specs are critical for RF or imaging applications.

Compared with MCP1700-2802E/TO and XC6206P282MR-G, the AP7340-28FS4-7 provides superior noise/PSRR performance and integrated thermal management - making it the preferred choice for RF bias, camera ISP, and audio codec supplies where signal integrity is non-negotiable.

Availability

AP7340-28FS4-7 is available at Aetrix Electronics and suitable for RF power amplifier bias, camera ISP power, wireless adapter baseband, and portable media player audio codec applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for AP7340-28FS4-7 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-reliability power management, signal integrity, and protection solutions for consumer, industrial, and communications markets.

The AP7340 belongs to Diodes' high-PSRR, low-noise LDO family designed specifically for noise-sensitive analog and RF subsystems in portable wireless equipment - emphasizing precision regulation, minimal footprint, and robust thermal behavior.

FAQ

What is the maximum allowable input voltage for AP7340-28FS4-7?

The absolute maximum input voltage is 6.0V, but the recommended operating range is 1.7V to 5.25V. Exceeding 5.25V risks violating safe operating area limits and may trigger internal protection circuits. Operation above 6.0V can cause permanent damage per Absolute Maximum Ratings.

Does AP7340-28FS4-7 include an output discharge function?

No - AP7340-28FS4-7 is the non-discharge variant. When disabled via EN pin, the output remains floating and retains charge on downstream capacitors. For automatic VOUT discharge, the AP7340D-28FS4-7 variant must be selected, which integrates an internal NMOS discharge switch.

Can AP7340-28FS4-7 operate with ceramic output capacitors smaller than 0.47µF?

Yes, but stability and transient response degrade. The datasheet specifies 0.47µF as the minimum recommended value for guaranteed stability across all loads and temperatures. Using 0.22µF or smaller may cause oscillation under heavy load transients or at temperature extremes.

How is thermal performance affected if the thermal pad is not connected to PCB ground?

Leaving the thermal pad unconnected reduces power dissipation capability from 400mW to approximately 150mW. Without thermal pad soldering to a ≥100mm² copper pour tied to GND, junction temperature rise exceeds safe limits at >80mA load - risking thermal shutdown or accelerated parametric drift.

AP7340-28FS4-7 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):: 5.25V

Voltage - Output (Min/Fixed):: 2.8V

Voltage - Output (Max):: -

Voltage Dropout (Max):: 0.27V @ 150mA

Current - Output:: 150mA

Current - Quiescent (Iq):: 50 µA

Current - Supply (Max):: 100 µA

PSRR:: 75dB (1kHz)

Control Features:: Enable

Protection Features:: Over Current

Operating Temperature:: -40°C ~ 85°C

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: X2-DFN1010-4

AP7340-28FS4-7 FAQ

1.How can I place an order for AP7340-28FS4-7 through Aetrix?

Please submit a Request for Quotation (RFQ) for AP7340-28FS4-7 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 AP7340-28FS4-7 reliable?

The price and inventory of AP7340-28FS4-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP7340-28FS4-7 is usually 5 days.

3.What payment methods are accepted for AP7340-28FS4-7?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP7340-28FS4-7 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for AP7340-28FS4-7?

AP7340-28FS4-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your AP7340-28FS4-7 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 AP7340-28FS4-7?

For technical support, including AP7340-28FS4-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP7340-28FS4-7 requirements.

6.How does Aetrix verify that AP7340-28FS4-7 is sourced from the original manufacturer or authorized distributors?

All AP7340-28FS4-7 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 AP7340-28FS4-7 meets industry standards.

7.What is the process for return or replacement of AP7340-28FS4-7?

All AP7340-28FS4-7 units undergo pre-shipment inspection (PSI). If there is an issue with AP7340-28FS4-7, 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 AP7340-28FS4-7 part is unused and in its original packaging.

Return procedure for AP7340-28FS4-7:

1.Submit a request within 90 days.

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

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