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

Diodes Incorporated AP7315D-28FS4-7B

Name: AP7315D-28FS4-7B
Brand: Diodes Incorporated
SKU: AP7315D-28FS4-7B
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: AP7315D-28FS4-7B

Manufacturer:: Diodes Incorporated

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

Package:: 4-XDFN Exposed Pad

Datasheet:: AP7315D-28FS4-7B.pdf

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

Quantity:: RFQ Add To RFQ list

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Product details

Overview

AP7315D-28FS4-7B from Diodes Incorporated is a 2.8V fixed-output, 150mA low-dropout linear regulator with enable control, ±1% output voltage accuracy, 75dB PSRR at 1kHz, and 60µV_rms output noise (10Hz–100kHz). It operates from 1.7V to 5.25V input and delivers ultra-low quiescent current (35µA typ) for RF supply and portable media applications.

For engineers reviewing the AP7315D-28FS4-7B datasheet, AP7315D-28FS4-7B pinout, AP7315D-28FS4-7B application, or AP7315D-28FS4-7B equivalent, key selection criteria include dropout voltage (210mV at 150mA), EN pin logic thresholds (0.5V low / 1.3V high), thermal performance in X2-DFN1010-4, and discharge functionality for fast VOUT decay during shutdown.

Technical Context

The AP7315D-28FS4-7B integrates a CMOS-based error amplifier, precision voltage reference, current-limit circuit, and active discharge path (N-channel MOSFET, R_ON = 30Ω typ) tied to the EN pin. Its architecture enables stable regulation under fast load transients while maintaining low noise and high PSRR across 10Hz–1MHz.

It supports three package variants but this variant uses the X2-DFN1010-4 (1.0mm × 1.0mm, 0.4mm height) with exposed thermal pad-requiring PCB copper area connection to GND for thermal dissipation-and features pin-compatible enable/disable sequencing with defined VIH/VIL thresholds and sub-1µA standby current.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Voltage	Fixed 2.8V ±1% - ensures stable bias for 2.8V logic rails and RF front-end ICs without external feedback.
Max Output Current	150mA - sufficient for powering single-core microcontrollers, camera sensors, or Bluetooth modules.
Dropout Voltage	210mV at 150mA - enables operation down to VIN = 3.01V, critical for single-cell Li-ion (3.0–4.2V) systems.
PSRR	75dB at 1kHz - suppresses switching noise from adjacent DC/DC converters feeding shared input rails.
Output Noise	60µV_rms (10Hz–100kHz) - preserves signal integrity in analog audio paths and ADC reference supplies.
Quiescent Current	35µA typical - extends battery life in always-on sensor nodes and wearable devices.
Enable Thresholds	V_IL ≤ 0.5V, V_IH ≥ 1.3V - compatible with 1.8V/3.3V GPIOs without level-shifting.

Pinout & Package

X2-DFN1010-4 package: 1.0mm × 1.0mm body, 0.4mm height, 0.5mm pitch, thermally enhanced with exposed pad (not electrically connected; recommended tied to GND plane).

Pin/Terminal	Circuit Role	Design Meaning
VIN (Pin 4)	Input power supply	Accepts 1.7–5.25V; requires 0.47µF ceramic capacitor placed adjacent to minimize input impedance.
GND (Pin 2)	Ground reference	Primary return path for load current and internal circuits; must connect directly to low-impedance ground plane.
EN (Pin 3)	Enable control input	Active-high logic: drives regulator ON/OFF; floating state prohibited; internal pull-down not present.
VOUT (Pin 1)	Regulated output	Delivers 2.8V ±1%; includes integrated discharge FET (30Ω) to rapidly deplete output capacitance when disabled.
Thermal PAD	Thermal dissipation node	Non-electrical thermal interface; must be soldered to large copper area connected to GND for ≤40°C/W θ_JA.

Key Features

Feature	Design Value
Integrated discharge FET	30Ω on-resistance enables <10µs VOUT decay from 2.8V to 0.1V, preventing back-powering of upstream circuits.
Ultra-low noise output	60µV_rms (10Hz–100kHz) eliminates need for post-regulation filtering in sensitive analog stages.
High PSRR at 1kHz	75dB rejection maintains clean 2.8V rail despite ripple from buck converter switching at 500kHz–2MHz.
Low dropout at full load	210mV dropout allows >93% efficiency at 150mA, reducing thermal stress in space-constrained layouts.
Wide input voltage range	1.7–5.25V operation supports direct connection to Li-ion, Li-poly, or USB-powered systems without pre-regulation.

Applications

RF Power Amplifier Bias

Camera Sensor Core Supply

Use Scenario: Providing clean, stable 2.8V bias to GaAs pHEMT power amplifiers in 4G/5G mobile front-ends.

IC Role / Device Role / Timing Role: Low-noise LDO delivering regulated V_CC to PA core, decoupled from noisy system rails.

Use Value: 60µV_rms noise prevents AM-to-PM distortion; 75dB PSRR rejects switcher ripple that would degrade EVM.

Use Scenario: Powering CIS image sensor digital core and analog pixel array in smartphone rear cameras.

IC Role / Device Role / Timing Role: Primary 2.8V supply for sensor logic and timing-critical analog blocks.

Use Value: ±1% accuracy ensures consistent ADC reference tracking; fast EN response enables frame-synchronized power gating.

Bluetooth LE Audio Codec

Wearable Heart Rate Monitor

Use Scenario: Supplying 2.8V to low-latency audio DSP and codec ICs in true wireless stereo earbuds.

IC Role / Device Role / Timing Role: Dedicated LDO for audio subsystem, isolated from main SoC's noisy 1.1V/1.8V domains.

Use Value: 35µA quiescent current minimizes idle drain; discharge function prevents residual voltage from interfering with codec reset sequences.

Use Scenario: Regulating 2.8V for optical heart rate sensor ASIC and IR LED driver in fitness bands.

IC Role / Device Role / Timing Role: Always-on supply enabling periodic LED pulsing and photodiode readout without wake-up latency.

Use Value: 150mA capability supports peak LED current bursts; -40°C to +85°C rating ensures reliability across environmental conditions.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
MCP1700T-2802E/TT	250mA rated, no discharge FET, 6µV_rms noise, 120dB PSRR at 1kHz	Lacks active discharge; requires external circuitry for fast VOUT decay	Select when ultra-low noise dominates over shutdown behavior and higher current headroom is needed.
Torex XC6210B282MR-G	200mA rated, built-in discharge, 40µV_rms noise, 70dB PSRR at 1kHz	Slightly lower PSRR; tighter 0.8% initial accuracy but wider tempco (±100ppm/°C)	Prefer for cost-sensitive wearables where minimal noise is critical and moderate PSRR suffices.

Compared with MCP1700T-2802E/TT and XC6210B282MR-G, the AP7315D-28FS4-7B uniquely balances 75dB PSRR, 60µV_rms noise, and integrated 30Ω discharge-making it optimal for compact RF and imaging systems requiring coordinated power sequencing and ripple immunity.

Availability

AP7315D-28FS4-7B is available at Aetrix Electronics and suitable for RF power amplifier bias, camera sensor core supply, Bluetooth LE audio codec, and wearable heart rate monitor applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant green packaging.

Supply support for AP7315D-28FS4-7B 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 for power management, signal integrity, and connectivity applications.

The AP7315 series belongs to Diodes' high-PSRR, low-noise LDO portfolio designed specifically for battery-powered portable electronics where efficiency, noise immunity, and fast transient response are critical.

FAQ

What is the purpose of the thermal pad on the X2-DFN1010-4 package?

The thermal pad is a non-electrical copper feature designed solely for heat dissipation. It must be soldered to a large PCB copper area connected to GND to achieve the specified θ_JA of ~40°C/W. Leaving it unconnected or using it as a functional GND node degrades thermal performance and risks device overheating under 150mA load.

Does AP7315D-28FS4-7B require an external discharge resistor?

No. Unlike standard AP7315 variants, the "D" suffix indicates integrated discharge functionality via an internal N-channel MOSFET (R_ON = 30Ω typ). When EN is pulled low, this FET actively discharges VOUT through GND, eliminating the need for external components and ensuring rapid, controlled voltage decay.

Can AP7315D-28FS4-7B operate with a 1.0µF output capacitor?

Yes. The device is stable with ceramic capacitors ≥0.47µF and ESR <100mΩ. A 1.0µF X7R ceramic capacitor improves transient response for pulsed loads (e.g., camera flash LEDs) and remains within the stable region per the ESR vs. IOUT graph in the datasheet-no additional compensation is required.

How does the AP7315D-28FS4-7B behave during input undervoltage?

Below VIN = 1.7V, regulation ceases and VOUT follows VIN minus dropout voltage until the internal undervoltage lockout (UVLO) activates at ~1.5V. At that point, the regulator disables and draws <1µA. Recovery occurs only after VIN rises above 1.7V and EN remains asserted-no hysteresis is specified, so input ramp rate should exceed 1V/ms for reliable startup.

AP7315D-28FS4-7B 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):: 2.8V

Voltage - Output (Max):: -

Voltage Dropout (Max):: 0.29V @ 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

AP7315D-28FS4-7B FAQ

1.How can I place an order for AP7315D-28FS4-7B through Aetrix?

Please submit a Request for Quotation (RFQ) for AP7315D-28FS4-7B 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 AP7315D-28FS4-7B reliable?

The price and inventory of AP7315D-28FS4-7B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP7315D-28FS4-7B is usually 5 days.

3.What payment methods are accepted for AP7315D-28FS4-7B?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP7315D-28FS4-7B transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for AP7315D-28FS4-7B?

AP7315D-28FS4-7B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your AP7315D-28FS4-7B 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 AP7315D-28FS4-7B?

For technical support, including AP7315D-28FS4-7B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP7315D-28FS4-7B requirements.

6.How does Aetrix verify that AP7315D-28FS4-7B is sourced from the original manufacturer or authorized distributors?

All AP7315D-28FS4-7B 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 AP7315D-28FS4-7B meets industry standards.

7.What is the process for return or replacement of AP7315D-28FS4-7B?

All AP7315D-28FS4-7B units undergo pre-shipment inspection (PSI). If there is an issue with AP7315D-28FS4-7B, 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 AP7315D-28FS4-7B part is unused and in its original packaging.

Return procedure for AP7315D-28FS4-7B:

1.Submit a request within 90 days.

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

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