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

Diodes Incorporated AP7315-25FS4-7B

Name: AP7315-25FS4-7B
Brand: Diodes Incorporated
SKU: AP7315-25FS4-7B
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: AP7315-25FS4-7B

Manufacturer:: Diodes Incorporated

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

Package:: 4-XDFN Exposed Pad

Datasheet:: AP7315-25FS4-7B.pdf

Description:: IC REG LINEAR 2.5V 150MA 4DFN

Quantity:: RFQ Add To RFQ list

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Product details

Overview

AP7315-25FS4-7B from Diodes Incorporated is a 2.5V fixed-output, 150mA low-dropout linear regulator with ±1% output voltage accuracy, 75dB PSRR at 1kHz, 60µVrms output noise (10Hz–100kHz), and 35µA quiescent current. It features enable control, thermal shutdown, and short-circuit protection, and is optimized for RF supply rails in compact portable electronics.

For engineers reviewing the AP7315-25FS4-7B datasheet, AP7315-25FS4-7B pinout, AP7315-25FS4-7B application, or AP7315-25FS4-7B equivalent, this page delivers verified electrical specs, package-specific pin mapping, real-world use cases, and validated alternative options for low-noise, high-PSRR LDO selection in space-constrained designs.

Technical Context

The AP7315-25FS4-7B uses a CMOS-based architecture with integrated voltage reference, error amplifier, and current-limit circuitry. Its non-discharge configuration maintains output voltage during shutdown, avoiding unintended discharge of downstream capacitance.

It operates across 1.7V to 5.25V input range and delivers stable 2.5V output up to 150mA load. Dropout voltage is 280mV typical at 150mA (2.5V output), enabling operation from single Li-ion or 3.3V system rails with margin.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Voltage	Fixed 2.5V ±1% - ensures precise biasing for ADC references and RF ICs requiring tight voltage tolerance.
Max Output Current	150mA - sufficient for powering baseband processors, RF transceivers, or sensor signal chains in portable devices.
PSRR	75dB at 1kHz - suppresses switching noise from PMICs or DC-DC converters feeding adjacent analog/RF blocks.
Output Noise	60µVrms (10Hz–100kHz) - minimizes phase noise degradation in VCOs and jitter in high-speed data interfaces.
Quiescent Current	35µA typical - extends battery life in always-on sensor nodes and standby modes of handheld equipment.
Dropout Voltage	280mV @ 150mA - allows regulation from 2.78V input, compatible with aging Li-ion cells down to ~2.8V under load.
Enable Threshold	V_EN(H) ≥ 1.3V, V_EN(L) ≤ 0.5V - compatible with 1.8V/3.3V GPIOs without level-shifting.

Pinout & Package

X2-DFN1010-4 (1.0mm × 1.0mm, 0.4mm pitch) - ultra-compact, thermally enhanced leadless package with exposed thermal pad. Requires PCB copper pour connected to GND for optimal thermal performance.

Pin/Terminal	Circuit Role	Design Meaning
VIN (Pin 4)	Input power supply	Accepts 1.7V–5.25V; requires 0.47µF ceramic capacitor placed adjacent to minimize input impedance.
GND (Pin 2)	Ground reference	Primary return path; must connect to low-impedance ground plane to maintain PSRR and stability.
EN (Pin 3)	Enable control input	Active-high logic input; floating state disables regulator - tie to VIN if always-on operation required.
VOUT (Pin 1)	Regulated output	Delivers 2.5V ±1%; requires 0.47µF ceramic capacitor near pin to ensure transient response and stability.
Thermal PAD	Thermal dissipation node	Not electrically functional; must be soldered to large GND copper area for thermal management (P_D = 400mW max).

Key Features

Feature	Design Value
High PSRR	75dB @ 1kHz - enables clean power delivery to noise-sensitive RF sections despite noisy shared supply rails.
Ultra-low noise	60µVrms (10Hz–100kHz) - preserves SNR in audio codecs and dynamic range in precision ADCs.
Low quiescent current	35µA - supports >1-year battery life in IoT sensors operating in deep-sleep cycles.
Wide input range	1.7V–5.25V - accommodates single-cell Li-ion (2.7–4.2V), 3.3V system rails, and USB-powered peripherals.
±1% output accuracy	Guaranteed over -40°C to +85°C - eliminates need for external trimming in production calibration of analog subsystems.

Applications

RF Power Amplifier Bias

Camera Sensor Core Supply

Use Scenario: Providing stable 2.5V bias to GaAs pHEMT power amplifiers in 4G/5G mobile front-end modules.

IC Role / Device Role / Timing Role: Low-noise LDO delivering regulated V_{CC_PA} independent of PA current spikes and supply ripple.

Use Value: Prevents AM-to-PM distortion and EVM degradation by maintaining <±10mV output deviation during 100mA load transients.

Use Scenario: Powering image sensor analog core (ADC reference, pixel array bias) in smartphone rear cameras.

IC Role / Device Role / Timing Role: Clean, low-noise 2.5V rail isolating sensor analog section from digital SoC noise.

Use Value: Reduces fixed-pattern noise and improves SNR by suppressing 60µVrms broadband noise coupling into pixel readout paths.

Wireless Audio Codec Supply

Portable Media Player DSP Core

Use Scenario: Supplying 2.5V to Bluetooth audio codec ICs handling DAC/ADC functions in true wireless earbuds.

IC Role / Device Role / Timing Role: Ultra-low-I_Q LDO enabling extended playback time while maintaining THD+N < -95dB.

Use Value: Extends battery runtime by 18% vs. higher-I_Q alternatives, with no compromise on audio fidelity.

Use Scenario: Regulating 2.5V for DSP core voltage in portable media players with multi-format decoding.

IC Role / Device Role / Timing Role: High-PSRR LDO rejecting noise from SD card interface and display backlight drivers.

Use Value: Eliminates audible clicks during file navigation and prevents DSP lockup caused by supply-induced timing errors.

Equivalent & Alternatives

The following parts are listed as comparable options for similar low-noise, fixed-output LDO applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
AP2204-25W5-7	Same 2.5V output, but SOT25 package (2.9mm × 1.6mm); 50µA I_Q; 65dB PSRR @ 1kHz	Larger footprint; lower PSRR reduces effectiveness in RF-heavy layouts	Preferred when board space permits larger package and thermal requirements are less stringent
MCP1700T-2502E/TT	2.5V ±2% accuracy; 125mA max I_OUT; 60µA I_Q; 60dB PSRR @ 1kHz	Lower accuracy and PSRR limit use in precision RF/analog circuits	Suitable for cost-sensitive consumer audio where ±2% tolerance and moderate noise rejection suffice

Compared with AP2204-25W5-7 and MCP1700T-2502E/TT, the AP7315-25FS4-7B offers superior PSRR (75dB vs. ≤65dB), tighter accuracy (±1% vs. ±2%), and smaller X2-DFN1010-4 footprint - making it optimal for miniaturized RF and imaging subsystems demanding highest power integrity.

Availability

AP7315-25FS4-7B is available at Aetrix Electronics and suitable for RF power amplifier bias, camera sensor core supply, and wireless audio codec supply requiring stable component supply, consistent parametric performance, and long-term manufacturability.

Supply support for AP7315-25FS4-7B 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 solutions, with emphasis on power management, signal integrity, and connectivity products.

The AP7315 series belongs to Diodes' high-performance LDO portfolio, designed specifically for noise-sensitive portable electronics where small size, low I_Q, and exceptional PSRR/noise performance are critical.

FAQ

What is the maximum allowable input voltage for AP7315-25FS4-7B?

The absolute maximum input voltage is 6.0V, but the recommended operating range is 1.7V to 5.25V. Exceeding 5.25V may trigger internal protection or degrade long-term reliability, even if within absolute ratings. Operation above 5.25V is not characterized or guaranteed per datasheet specifications.

Does AP7315-25FS4-7B include output discharge functionality?

No - AP7315-25FS4-7B is the non-discharge variant (suffix "-" not "D"). When disabled via EN pin, the output remains floating and does not actively discharge external capacitors. For automatic output discharge, select AP7315D-25FS4-7B, which integrates an internal NMOS discharge switch.

Can AP7315-25FS4-7B be used with ceramic output capacitors smaller than 0.47µF?

The datasheet specifies 0.47µF as the minimum recommended value for stability across temperature and load. While some designs may function with 0.22µF, doing so risks instability under high-current transients or at temperature extremes - violating the guaranteed stability condition defined in the Electrical Characteristics table.

How is thermal performance affected if the thermal pad is left unconnected?

Leaving the thermal pad unconnected increases junction-to-ambient thermal resistance by >40°C/W, limiting safe continuous output current to <50mA at +25°C ambient. To achieve full 150mA capability and meet the 400mW power dissipation rating, the pad must be soldered to a ≥25mm² GND copper pour.

AP7315-25FS4-7B 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):: 2.5V

Voltage - Output (Max):: -

Voltage Dropout (Max):: 0.32V @ 150mA

Current - Output:: 150mA

Current - Quiescent (Iq):: 60 µA

Current - Supply (Max):: 100 µA

PSRR:: 75dB (1kHz)

Control Features:: -

Protection Features:: Over Current

Operating Temperature:: -40°C ~ 85°C

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: X2-DFN1010-4

AP7315-25FS4-7B FAQ

1.How can I place an order for AP7315-25FS4-7B through Aetrix?

Please submit a Request for Quotation (RFQ) for AP7315-25FS4-7B 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 AP7315-25FS4-7B reliable?

The price and inventory of AP7315-25FS4-7B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP7315-25FS4-7B is usually 5 days.

3.What payment methods are accepted for AP7315-25FS4-7B?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP7315-25FS4-7B transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for AP7315-25FS4-7B?

AP7315-25FS4-7B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your AP7315-25FS4-7B 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 AP7315-25FS4-7B?

For technical support, including AP7315-25FS4-7B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP7315-25FS4-7B requirements.

6.How does Aetrix verify that AP7315-25FS4-7B is sourced from the original manufacturer or authorized distributors?

All AP7315-25FS4-7B 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 AP7315-25FS4-7B meets industry standards.

7.What is the process for return or replacement of AP7315-25FS4-7B?

All AP7315-25FS4-7B units undergo pre-shipment inspection (PSI). If there is an issue with AP7315-25FS4-7B, 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 AP7315-25FS4-7B part is unused and in its original packaging.

Return procedure for AP7315-25FS4-7B:

1.Submit a request within 90 days.

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

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