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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Voltage Regulators - DC DC Switching Regulators

Diodes Incorporated AP3431MTR-G1

Name: AP3431MTR-G1
Brand: Diodes Incorporated
SKU: AP3431MTR-G1
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: AP3431MTR-G1

Manufacturer:: Diodes Incorporated

Category:: Voltage Regulators - DC DC Switching Regulators

Package:: 8-SOIC (0.154", 3.90mm Width)

Datasheet:: AP3431MTR-G1.pdf

Description:: IC REG BUCK ADJ 2A 8SOIC

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Product details

Overview

AP3431MTR-G1 from BCD Semiconductor Manufacturing Limited is a synchronous step-down DC-DC converter IC optimized for portable and space-constrained applications. It delivers up to 2.0A output current with 1.0MHz fixed switching frequency, integrated 120mΩ PMOS/NMOS power switches, adjustable output voltage (0.8V to 0.9×VIN), and operates across 2.7V–5.5V input range - used in post-regulation for LCD TV and notebook computer power rails.

For engineers reviewing the AP3431MTR-G1 datasheet, AP3431MTR-G1 pinout, AP3431MTR-G1 application, or AP3431MTR-G1 equivalent, this page provides verified functional context, SOIC-8 package mapping, feedback voltage accuracy (±2%), thermal shutdown behavior (160°C), and real-world load transient response data for rapid design integration.

Technical Context

The AP3431 employs peak-current mode control with internal oscillator and timing capacitors, enabling stable regulation without external frequency-setting components. Its synchronous rectification architecture uses matched 120mΩ PMOS and NMOS switches to minimize conduction loss at high duty cycles.

Feedback is referenced to a precise 0.8V internal bandgap (±2% tolerance), supporting adjustable output via external resistor divider. Protection features include under-voltage lockout (2.7V threshold with 0.1V hysteresis), soft-start (450µs), and thermal shutdown with 30°C hysteresis - all implemented in analog circuitry without microcontroller dependency.

Key Specifications

Parameter	Value and Actual Design Meaning
Switching Frequency	1.0MHz - enables use of compact 2.2µH inductors and low-ESR ceramic capacitors in portable designs.
Max Output Current	2.0A continuous - supports core logic rails in PDA and set-top box applications with margin for transient loads.
Input Voltage Range	2.7V to 5.5V - compatible with single-cell Li-ion (3.0–4.2V) and USB-powered systems (5V).
Feedback Voltage	0.8V ±2% - sets output accuracy and determines R1/R2 ratio for target VOUT (e.g., 3.3V requires R1=31.25kΩ, R2=10kΩ).
Internal Switch R_DS(ON)	120mΩ (PMOS & NMOS at VIN=5V) - reduces conduction loss and improves efficiency above 500mA load.
Soft-Start Time	450µs - limits inrush current during power-up, preventing input rail droop in multi-rail systems.
Thermal Shutdown	160°C with 30°C hysteresis - protects die during sustained overload or poor PCB thermal layout.

Pinout & Package

AP3431MTR-G1 is housed in an 8-pin SOIC package (5.0mm × 6.2mm, 1.27mm pitch) with exposed thermal pad (not electrically connected). The package supports standard reflow profiles and provides adequate thermal dissipation for ≤1.45W power dissipation at TA=25°C.

Pin/Terminal	Circuit Role	Design Meaning
1 VCC	Analog supply input	Powers internal reference, error amplifier, and control logic; must be decoupled near pin with ≥1µF ceramic capacitor.
2 NC	No connection	Unbonded die pad; must remain floating - no trace or copper pour allowed.
3 GND	Analog ground	Reference node for feedback and control circuits; separate from PGND to avoid noise coupling into FB path.
4 FB	Feedback input	High-impedance node sensing resistive divider output; requires direct routing to minimize EMI pickup.
5 EN	Enable control	Active-high logic input with 200kΩ internal pull-up; drives device into shutdown mode (<4µA quiescent) when pulled low.
6 PGND	Power switch ground	Return path for high-current MOSFET switching; must connect to low-inductance ground plane adjacent to SW and VIN pins.
7 SW	Switch node	Drives external inductor; carries high di/dt square wave - keep trace short, wide, and away from FB/GND traces.
8 VIN	Power MOSFET supply	High-current input for internal switches; requires low-ESR input capacitor (≥10µF) placed within 2mm of pin.

Key Features

Feature	Design Value
Synchronous rectification	Integrated 120mΩ PMOS/NMOS switches eliminate external Schottky diode, improving full-load efficiency by ≥8% vs. asynchronous designs.
Fixed 1MHz switching	Eliminates external timing components and reduces EMI fundamental frequency to predictable 1MHz band for easier filtering.
Adjustable output (0.8V–0.9×VIN)	Supports common logic rails (1.0V, 1.2V, 1.8V, 2.5V, 3.3V) using only two external resistors - no trimming required.
Integrated protection suite	Combines UVLO (2.7V), thermal shutdown (160°C), short-circuit recovery (soft-start restart), and overcurrent limiting - no external fault management needed.
Green RoHS-compliant packaging	"G1" suffix denotes lead-free, halogen-free SOIC-8 construction meeting JEDEC J-STD-020C reflow standards.

Applications

LCD TV Power Management

Set-Top Box Core Rail

Use Scenario: Regulating 3.3V/2.5V auxiliary rails from 5V main supply in slim-panel LCD TVs with tight thermal constraints.

IC Role / Device Role / Timing Role: Primary synchronous buck controller delivering stable, low-noise output for TCON and audio codec ICs.

Use Value: 1MHz operation allows 2.2µH inductor size reduction by 60% vs. 500kHz alternatives, saving board area without sacrificing transient response.

Use Scenario: Generating 1.2V core voltage for ARM-based SoCs in cable/satellite STBs operating continuously at ambient up to 70°C.

IC Role / Device Role / Timing Role: High-efficiency point-of-load regulator with thermal shutdown ensuring safe operation during extended video decoding sessions.

Use Value: 120mΩ R_DS(ON) minimizes I²R loss at 1.8A typical load, maintaining >90% efficiency and junction temperature below 115°C on 2-layer PCB.

Notebook Computer I/O Rail

PDA System-on-Module Supply

Use Scenario: Providing 1.8V/2.5V I/O voltage for DDR memory interfaces and USB PHYs in ultraportable notebooks with battery life optimization priority.

IC Role / Device Role / Timing Role: Adjustable buck converter with enable control synchronized to system sleep/wake states.

Use Value: 4µA shutdown current extends battery runtime during S3 suspend; soft-start prevents brownout during resume from deep sleep.

Use Scenario: Powering ARM Cortex-M4 MCU and wireless transceiver (BLE/Wi-Fi) in handheld PDAs with limited PCB real estate.

IC Role / Device Role / Timing Role: Compact, self-contained DC-DC solution replacing discrete FET+controller designs.

Use Value: SOIC-8 footprint and integrated switches reduce BOM count by 7 parts vs. controller+external MOSFET solution, lowering assembly cost.

Equivalent & Alternatives

The following parts are listed as comparable options for similar synchronous buck converter applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
MP2307DN-LF-Z (Monolithic Power Systems)	Same 2A rating, 1.0MHz freq, but uses external compensation; FB reference = 0.805V; higher R_DS(ON) (140mΩ/180mΩ).	Requires additional RC network for loop stability tuning; less suitable for production designs requiring zero-compensation validation.	Select if design already uses MP2307 reference layouts or needs adjustable compensation for custom ESR/inductor combinations.
TPS562201 (Texas Instruments)	Lower 1.5A rating, 500kHz switching, integrated compensation, 0.8V FB, but superior light-load efficiency (PFM mode) and smaller SOT-23-6 package.	Better suited for <1A applications where board space is critical and 1MHz EMI sensitivity is high.	Select for ultra-compact, low-power IoT nodes where 2A capability is unnecessary and thermal headroom is constrained.

Compared with MP2307DN-LF-Z and TPS562201, AP3431MTR-G1 offers higher current capacity and fixed-frequency simplicity at the cost of larger SOIC-8 footprint - optimal for cost-sensitive, medium-power consumer electronics where layout time and component count are prioritized over minimal size.

Availability

AP3431MTR-G1 is available at Aetrix Electronics and suitable for LCD TV, set-top box, and notebook computer power subsystems requiring stable component supply, RoHS compliance, and long-term industrial availability.

Supply support for AP3431MTR-G1 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

BCD Semiconductor Manufacturing Limited is a Shanghai-based fabless analog IC designer specializing in high-efficiency power management solutions for consumer, computing, and industrial markets since 2003.

The AP3431 belongs to BCD's APx3xx series of integrated synchronous buck converters targeting cost-effective, space-efficient DC-DC regulation in portable and mainstream electronics - emphasizing ease of use, robust protection, and minimal external component count.

FAQ

What is the minimum recommended output capacitance for stable operation?

The AP3431 requires ≥22µF total output capacitance with low ESR (≤20mΩ) for stable regulation and acceptable load transient response. Ceramic capacitors are preferred; if using electrolytic types, parallel with ≥1µF ceramic to suppress high-frequency ripple. Layout must place COUT within 5mm of FB and PGND pins to maintain loop stability.

Can the AP3431 operate with input voltage below 2.7V?

No - the absolute minimum input voltage is 2.7V per the UVLO threshold. Operation below this level disables regulation and forces the device into undervoltage lockout. At VIN = 2.6V, EN remains inactive and SW output ceases; recovery occurs only after VIN rises above 2.7V + 0.1V hysteresis.

How does the AP3431 handle short-circuit conditions?

Upon output short-to-GND, FB voltage drops below 0.4V, triggering automatic soft-start restart cycle. The device limits peak inductor current to 2.9A and cycles until fault clears. Recovery is automatic: once VFB exceeds 0.4V for >100µs, normal PWM regulation resumes without external intervention.

Is the NC pin (Pin 2) electrically isolated or internally tied?

Pin 2 is a true no-connect terminal - it has no internal bond wire or silicon connection. PCB layout must leave this pad unconnected: no trace, no copper pour, and no solder mask opening. Routing signals or grounding near Pin 2 may induce parasitic coupling into adjacent SW or FB pins.

AP3431MTR-G1 Specifications

Product attributes: Attribute value

Manufacturer:: Diodes Incorporated

Series:: -

Package/Case:: 8-SOIC (0.154", 3.90mm Width)

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Function:: Step-Down

Output Configuration:: Positive

Topology:: Buck

Output Type:: Adjustable

Number of Outputs:: 1

Voltage - Input (Min):: 2.7V

Voltage - Input (Max):: 5.5V

Voltage - Output (Min/Fixed):: 0.8V

Voltage - Output (Max):: 5.5V

Current - Output:: 2A

Frequency - Switching:: 1MHz

Synchronous Rectifier:: Yes

Operating Temperature:: -40°C ~ 80°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 8-SOIC

AP3431MTR-G1 FAQ

1.How can I place an order for AP3431MTR-G1 through Aetrix?

Please submit a Request for Quotation (RFQ) for AP3431MTR-G1 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 AP3431MTR-G1 reliable?

The price and inventory of AP3431MTR-G1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP3431MTR-G1 is usually 5 days.

3.What payment methods are accepted for AP3431MTR-G1?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP3431MTR-G1 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for AP3431MTR-G1?

AP3431MTR-G1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your AP3431MTR-G1 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 AP3431MTR-G1?

For technical support, including AP3431MTR-G1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP3431MTR-G1 requirements.

6.How does Aetrix verify that AP3431MTR-G1 is sourced from the original manufacturer or authorized distributors?

All AP3431MTR-G1 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 AP3431MTR-G1 meets industry standards.

7.What is the process for return or replacement of AP3431MTR-G1?

All AP3431MTR-G1 units undergo pre-shipment inspection (PSI). If there is an issue with AP3431MTR-G1, 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 AP3431MTR-G1 part is unused and in its original packaging.

Return procedure for AP3431MTR-G1:

1.Submit a request within 90 days.

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

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