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

Diodes Incorporated AP7346D-1815FS6-7

Name: AP7346D-1815FS6-7
Brand: Diodes Incorporated
SKU: AP7346D-1815FS6-7
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: AP7346D-1815FS6-7

Manufacturer:: Diodes Incorporated

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

Package:: 6-XFDFN Exposed Pad

Datasheet:: AP7346D-1815FS6-7.pdf

Description:: IC REG LIN 1.5V/1.8V X2DFN1212-6

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Product details

Overview

AP7346D-1815FS6-7 from Diodes Incorporated is a dual-channel, high-accuracy current-limiting LDO regulator in X2-DFN1212-6 package, delivering fixed 1.8V and 1.5V outputs with ±1% accuracy, 157mA ±25mA current limit per channel, and 75dB PSRR at 1kHz. It targets low-power portable RF and imaging subsystems requiring independent, tightly regulated supplies with fast transient response and ultra-low quiescent current (35µA per active channel).

For engineers reviewing the AP7346D-1815FS6-7 datasheet, AP7346D-1815FS6-7 pinout, AP7346D-1815FS6-7 application, or AP7346D-1815FS6-7 equivalent, key selection criteria include dual-output voltage matching, channel enable independence, thermal performance in 1.2mm × 1.2mm DFN, and discharge functionality for controlled power-down sequencing in space-constrained handheld designs.

Technical Context

The AP7346D-1815FS6-7 integrates two independent CMOS-based LDO regulators sharing a single VIN input but featuring separate EN1/EN2 control and VOUT1/VOUT2 outputs. Each channel includes a precision voltage reference, error amplifier, fold-back current limit circuit (132–182mA), and auto-discharge NMOS (50Ω typical) activated during shutdown.

It operates across 1.7V–5.25V input range with dropout as low as 0.22V at 3.0V–3.6V output and supports stable operation with 0.47µF ceramic output capacitors. The device achieves 60µV_rms output noise (10Hz–100kHz) and maintains ±1.5% output accuracy over –40°C to +85°C ambient.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Voltages	1.8V (Channel 1), 1.5V (Channel 2); fixed via internal resistor network - eliminates external feedback components and simplifies layout.
Output Accuracy	±1% at +25°C, ±1.5% over –40°C to +85°C - ensures stable core/logic rail compliance without calibration.
Current Limit	157mA ±25mA per channel - provides predictable short-circuit protection while supporting peak loads in camera and RF modules.
PSRR	75dB at 1kHz - suppresses switching noise from adjacent DC-DC converters feeding shared input rails.
Quiescent Current	35µA per active channel (EN high, no load) - extends battery life in always-on sensor or standby subsystems.
Dropout Voltage	0.29V max at 3.0V–3.6V output, 0.39V max at 1.2V–1.4V - enables efficient regulation from single-cell Li-ion or boosted 3.3V rails.
Output Noise	60µV_rms (10Hz–100kHz) - preserves signal integrity in analog front-ends and RF bias networks.

Pinout & Package

X2-DFN1212-6 package: 1.2mm × 1.2mm body, 0.4mm pitch, exposed thermal pad (non-functional GND electrode; requires PCB copper area for thermal dissipation).

Pin/Terminal	Circuit Role	Design Meaning
1 VOUT1	Channel 1 regulated output	Delivers fixed 1.8V supply; must be decoupled with ≥0.47µF ceramic capacitor placed adjacent to pin and GND.
2 VOUT2	Channel 2 regulated output	Delivers fixed 1.5V supply; independent of VOUT1 - enables asymmetric rail generation for mixed-voltage SoCs.
3 GND	Power ground reference	Common return path for both channels; requires low-impedance connection to PCB ground plane to minimize noise coupling.
4 EN2	Channel 2 enable input	Logic-level control (0–0.5V low, 1.3–5.25V high); floating prohibited - ties to VIN or microcontroller GPIO for sequenced power-up.
5 VIN	Input power supply	Shared 1.7–5.25V input for both regulators; requires ≥0.47µF ceramic decoupling capacitor placed within 2mm of pin.
6 EN1	Channel 1 enable input	Independent logic-level control for VOUT1; allows dynamic channel disable to reduce system standby current.

Key Features

Feature	Design Value
Dual independent enable inputs	EN1 and EN2 allow asynchronous power sequencing - critical for SoC boot order compliance and leakage reduction in multi-rail systems.
Built-in auto-discharge	50Ω NMOS per output discharges VOUT pins when EN is low - prevents floating rails and ensures clean reset behavior in portable devices.
Ultra-low noise & high PSRR	60µV_rms noise + 75dB PSRR at 1kHz - meets stringent requirements for RF transceiver bias and image sensor analog supplies.
Wide input voltage range	1.7V–5.25V operation - supports direct connection to single-cell Li-ion (2.7–4.2V), USB 5V, or post-regulated 3.3V/2.5V rails.
Thermally optimized DFN	X2-DFN1212-6 with exposed thermal pad - achieves 120°C/W θ_JA with 100mm² 1oz copper pour, enabling 130mA continuous per channel at +85°C ambient.

Applications

Fingerprint Module Power

Smartphone Camera Subsystem

Use Scenario: Dual-rail power for capacitive fingerprint sensor IC and its analog front-end ASIC.

IC Role / Device Role / Timing Role: Provides isolated 1.8V digital I/O supply and 1.5V analog bias rail with independent enable control for wake-on-touch sequencing.

Use Value: Enables <100µs power-up latency and <1µA total shutdown current via coordinated EN1/EN2 control - meeting mobile biometric responsiveness and battery-life targets.

Use Scenario: Dedicated low-noise bias for CMOS image sensor pixel array and ISP core voltage.

IC Role / Device Role / Timing Role: Delivers 1.8V (sensor I/O) and 1.5V (ISP logic) with simultaneous transient suppression during frame capture bursts.

Use Value: 60µV_rms noise and 75dB PSRR prevent switching artifacts in raw image data - eliminating need for additional ferrite-bead filtering.

Wireless Adapter RF Bias

Portable Media Player Audio Codec

Use Scenario: Clean local regulation for 2.4GHz/5GHz RF power amplifier and LNA bias networks.

IC Role / Device Role / Timing Role: Supplies 1.8V PA driver and 1.5V LNA rails with fast load transient response (<50µs recovery) during TX/RX mode switching.

Use Value: 0.29V dropout at 3.0V output allows direct use of 3.3V system rail - reducing BOM count versus cascaded regulation schemes.

Use Scenario: Dual-voltage support for audio codec DSP core (1.5V) and interface I/O (1.8V) in battery-powered players.

IC Role / Device Role / Timing Role: Regulates from shared 3.3V battery rail; EN1/EN2 permit independent sleep/wake of DSP and interface blocks.

Use Value: 35µA quiescent current per active channel extends playback time by >8% versus legacy dual-LDO solutions in 10-hour test cycles.

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-output LDO applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
AP7345D-1815FS6-7	Successor part with identical pinout, same 1.8V/1.5V outputs, improved OCP tolerance (±15mA vs ±25mA), and enhanced thermal derating above 70°C.	Qualified for new designs; replaces AP7346 per Diodes' notice - recommended where long-term supply continuity and tighter current limit spec are required.	Select AP7345D if designing in after Q3 2023; AP7346 remains viable for legacy production with existing qualification.
Torex XC6216D1815MR-G	1.8V/1.5V dual LDO in SOT-26; higher quiescent current (65µA), lower PSRR (65dB), no auto-discharge, wider dropout (0.45V @ 150mA).	Lacks independent EN pins and discharge function - unsuitable for sequenced power-down or noise-sensitive RF applications.	Consider only for cost-sensitive, non-sequencing applications where board space allows SOT-26 and noise/PSRR specs are relaxed.

Compared with AP7345D-1815FS6-7, the AP7346D-1815FS6-7 offers identical functionality but looser OCP tolerance and reduced thermal margin; versus XC6216D1815MR-G, it delivers superior noise, PSRR, and sequencing capability at the cost of slightly higher complexity and footprint density.

Availability

AP7346D-1815FS6-7 is available at Aetrix Electronics and suitable for fingerprint modules, smartphone camera subsystems, and wireless adapter RF bias circuits requiring stable component supply, consistent parametric performance, and long-term industrial availability.

Supply support for AP7346D-1815FS6-7 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-performance power management, signal integrity, and connectivity solutions for consumer, industrial, and automotive markets.

The AP7346 series belongs to Diodes' high-accuracy dual-LDO product line, designed specifically for space-constrained portable electronics needing independent, low-noise, sequenced power rails with minimal external components.

FAQ

Is AP7346D-1815FS6-7 recommended for new designs?

No - Diodes explicitly states "AP7346 IS NOT RECOMMENDED FOR NEW DESIGNS. PLEASE USE THE AP7345D." The AP7345D is a direct pin- and function-compatible successor with tighter current limit tolerance (±15mA), improved thermal performance above 70°C, and ongoing production support. AP7346D-1815FS6-7 remains available for legacy design continuity and last-time buys.

What is the role of the thermal pad on the X2-DFN1212-6 package?

The exposed thermal pad is not an electrical GND terminal but a mechanical thermal interface. It must be connected to a large PCB copper area (ideally ≥25mm²) tied to system ground for heat dissipation - not used as the sole GND return path. Improper thermal pad layout increases junction temperature by up to 40°C at 130mA load, risking thermal shutdown or accelerated aging.

Can EN1 and EN2 be tied together for simultaneous control?

Yes - EN1 and EN2 may be connected to a common GPIO or VIN for synchronized channel enable/disable. However, doing so forfeits independent sequencing capability. If used jointly, ensure drive strength exceeds 1µA leakage and voltage thresholds meet 0–0.5V (low) and 1.3–5.25V (high) per datasheet; floating EN pins will cause undefined regulator state.

Does AP7346D-1815FS6-7 support reverse current blocking?

No - the device lacks integrated reverse-current protection. When VIN drops below VOUT, reverse current can flow from VOUT1 or VOUT2 back into VIN through the internal pass FET body diode. External Schottky diodes or ideal diode controllers are required in systems where input rail collapse (e.g., battery disconnect) must prevent backfeed into upstream supplies.

AP7346D-1815FS6-7 Specifications

Product attributes: Attribute value

Manufacturer:: Diodes Incorporated

Series:: -

Package/Case:: 6-XFDFN Exposed Pad

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Output Configuration:: Positive

Output Type:: Fixed

Number of Regulators:: 2

Voltage - Input (Max):: 5.25V

Voltage - Output (Min/Fixed):: 1.5V, 1.8V

Voltage - Output (Max):: -

Voltage Dropout (Max):: 0.44V @ 120mA, 0.39V @ 120mA

Current - Output:: 130mA, 130mA

Current - Quiescent (Iq):: 100 µA

Current - Supply (Max):: -

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-DFN1212-6

AP7346D-1815FS6-7 FAQ

1.How can I place an order for AP7346D-1815FS6-7 through Aetrix?

Please submit a Request for Quotation (RFQ) for AP7346D-1815FS6-7 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 AP7346D-1815FS6-7 reliable?

The price and inventory of AP7346D-1815FS6-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP7346D-1815FS6-7 is usually 5 days.

3.What payment methods are accepted for AP7346D-1815FS6-7?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP7346D-1815FS6-7 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for AP7346D-1815FS6-7?

AP7346D-1815FS6-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your AP7346D-1815FS6-7 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 AP7346D-1815FS6-7?

For technical support, including AP7346D-1815FS6-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP7346D-1815FS6-7 requirements.

6.How does Aetrix verify that AP7346D-1815FS6-7 is sourced from the original manufacturer or authorized distributors?

All AP7346D-1815FS6-7 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 AP7346D-1815FS6-7 meets industry standards.

7.What is the process for return or replacement of AP7346D-1815FS6-7?

All AP7346D-1815FS6-7 units undergo pre-shipment inspection (PSI). If there is an issue with AP7346D-1815FS6-7, 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 AP7346D-1815FS6-7 part is unused and in its original packaging.

Return procedure for AP7346D-1815FS6-7:

1.Submit a request within 90 days.

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

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