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

Diodes Incorporated AP3419KTTR-G1

Name: AP3419KTTR-G1
Brand: Diodes Incorporated
SKU: AP3419KTTR-G1
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: AP3419KTTR-G1

Manufacturer:: Diodes Incorporated

Category:: Voltage Regulators - DC DC Switching Regulators

Package:: SOT-23-6 Thin, TSOT-23-6

Datasheet:: AP3419KTTR-G1.pdf

Description:: IC REG BUCK ADJ 2A TSOT26

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Product details

Overview

AP3419KTTR-G1 from Diodes Incorporated is a synchronous step-down DC-DC buck converter delivering up to 2A output current with 1MHz fixed-frequency PWM control, 0.6V to VIN adjustable output voltage, and 2.7V–5.5V input range. It integrates high- and low-side MOSFETs (R_DS(ON) = 110mΩ/80mΩ), supports 100% duty cycle operation, and achieves up to 95% peak efficiency in point-of-load applications such as DDR memory power supplies.

For engineers reviewing the AP3419KTTR-G1 datasheet, AP3419KTTR-G1 pinout, AP3419KTTR-G1 application, or AP3419KTTR-G1 equivalent, key selection criteria include its ultra-low 90μA no-load quiescent current, <1μA shutdown current, internal soft-start, no external compensation requirement, and TSOT26 package compatibility with space-constrained portable designs.

Technical Context

The AP3419KTTR-G1 employs a constant-frequency current-mode PWM architecture with internal slope compensation and anti-shoot-through logic to ensure stable regulation and fast transient response under dynamic load conditions. Its error amplifier compares FB voltage against a precise 0.6V reference, enabling accurate output voltage setting via external resistor divider.

Functional protection includes under-voltage lockout (UVLO) with 2.4V turn-on threshold and 0.2V hysteresis, thermal shutdown at +160°C with +30°C hysteresis, short-circuit hiccup mode recovery, and input over-voltage protection at 6.25V. The EN pin provides logic-level enable/disable control with 1.5V high-threshold and 0.4V low-threshold.

Key Specifications

Parameter	Value and Actual Design Meaning
Input Voltage Range	2.7V to 5.5V - supports single Li+/Li-polymer cell or dual Alkaline/NiMH cells without external regulators
Output Voltage Range	0.6V to VIN - enables direct 1.8V DDR supply or adjustable rail generation down to sub-1V logic cores
Max Output Current	2A - sufficient for powering FPGA I/O banks, microcontroller cores, or ASIC auxiliary rails
Switching Frequency	1MHz - allows compact 2.2µH inductor and 22µF ceramic output capacitors, reducing board area
Quiescent Current	90μA (typ) - minimizes battery drain in always-on subsystems like real-time clocks or sensor interfaces
Shutdown Current	<1μA - ensures negligible leakage during system sleep modes, extending battery life
Feedback Reference	0.6V ±2% - enables precise output regulation with standard 1% resistor dividers
Peak Efficiency	95% - achieved at mid-load with 5V input/1.8V output, reducing thermal stress in sealed enclosures

Pinout & Package

AP3419KTTR-G1 is housed in a thermally enhanced TSOT26 (6-pin thin shrink small outline transistor) package with 0.95mm height, 2.9mm × 2.8mm footprint, and exposed pad for improved thermal dissipation. Pin 1 is marked with a dot; pin numbering follows standard top-view orientation.

Pin/Terminal	Circuit Role	Design Meaning
1 (EN)	Enable control input	Logic-high (>1.5V) activates regulator; logic-low (<0.4V) disables output and reduces supply current to <1μA
2 (GND)	Power and signal ground	Common return path for IC bias, switching currents, and feedback network; must be low-impedance
3 (LX)	Switch node	Connection point between internal high- and low-side MOSFETs; requires low-ESR ceramic capacitor and tight layout to minimize EMI
4 (VIN)	Main power input	Supplies gate drive and internal circuitry; requires local 22µF decoupling close to pin
5 (NC)	No connect	Internally unconnected; must remain floating-no external connection permitted
6 (FB)	Feedback input	Monitors output voltage via resistor divider; 0.6V reference sets V_OUT = 0.6V × (1 + R1/R2)

Key Features

Feature	Design Value
No external compensation required	Internal Type-II compensation eliminates need for external capacitor/resistor network, reducing BOM count and layout sensitivity
100% duty cycle operation	Enables dropout-free regulation down to V_OUT ≈ V_IN − 0.1V, critical for battery-powered systems near end-of-discharge
Integrated 110mΩ/80mΩ MOSFETs	Reduces conduction losses and eliminates discrete switch selection; enables >90% efficiency at 1A load across full input range
Internal soft-start (1.8ms)	Prevents inrush current and output overshoot during power-up, eliminating need for external timing components
Short-circuit hiccup recovery	Automatically cycles on/off during sustained overload, limiting average power dissipation and enabling self-recovery without host intervention

Applications

DDR Memory Power Supply

5V/3.3V Point-of-Load Conversion

Use Scenario: Providing tightly regulated 1.2V or 1.35V VDDQ rail for DDR3/DDR4 SDRAM in embedded computing modules.

IC Role / Device Role / Timing Role: Primary synchronous buck regulator delivering 2A peak current with fast transient response to memory burst loads.

Use Value: 1MHz switching enables use of small 2.2µH inductors and ceramic caps, minimizing PCB area while maintaining <±1% output accuracy under 0.1A→2A load steps.

Use Scenario: Generating stable 3.3V or 5V rails from USB or single-cell Li+ sources in portable instrumentation and IoT edge nodes.

IC Role / Device Role / Timing Role: Standalone step-down converter replacing linear regulators to improve efficiency and reduce thermal load.

Use Value: 95% peak efficiency and 90μA quiescent current extend battery runtime by >3× compared to LDO-based solutions in intermittent-sensing applications.

Telecom Line Card Power

Set-Top Box SoC Core Supply

Use Scenario: Delivering 1.8V or 2.5V auxiliary power to PHY transceivers and clock buffers on telecom line cards with strict EMI limits.

IC Role / Device Role / Timing Role: High-frequency buck converter operating in constant PWM mode to avoid frequency modulation noise in sensitive analog sections.

Use Value: Fixed 1MHz frequency simplifies EMI filter design; TSOT26 package allows placement near load to minimize IR drop and improve PSRR.

Use Scenario: Supplying 1.1V core voltage to ARM-based SoCs in consumer STBs where thermal headroom is limited inside plastic enclosures.

IC Role / Device Role / Timing Role: Main core regulator with thermal shutdown and UVLO to prevent brownout-induced firmware corruption during AC line sags.

Use Value: +160°C thermal shutdown with +30°C hysteresis prevents latch-up; 2.4V UVLO avoids deep discharge of backup coin cells used for RTC retention.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
MP2143DJ-LF-Z (Monolithic Power)	2A rating, 2.5–5.5V input, 0.8V ref, 1.5MHz f_SW, requires external compensation	Higher switching frequency enables smaller magnetics but increases EMI filtering complexity	Select when board space is more constrained than EMI budget, and design team has compensation tuning capability
TPS62231DRYT (Texas Instruments)	2A rating, 2.05–6V input, 0.6V ref, 3.6MHz f_SW, integrated soft-start, no external compensation	Higher f_SW allows 1µH inductors but increases switching losses above 1.5A	Prefer for ultra-compact layouts needing <1mm height; verify thermal performance at full 2A continuous load

Compared with MP2143DJ-LF-Z and TPS62231DRYT, AP3419KTTR-G1 offers lower quiescent current (90μA vs. 120–150μA), wider input range down to 2.7V, and proven 1MHz stability without compensation-making it optimal for cost-sensitive, battery-powered designs requiring long standby life and minimal layout iteration.

Availability

AP3419KTTR-G1 is available at Aetrix Electronics and suitable for DDR memory power supplies, 5V/3.3V point-of-load conversion, and telecom line card applications requiring stable component supply, RoHS/Green compliance, and TSOT26 footprint consistency.

Supply support for AP3419KTTR-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

Diodes Incorporated is a global manufacturer of discrete semiconductors and analog ICs, specializing in high-efficiency power management, signal integrity, and protection solutions for industrial, computing, and consumer markets.

The AP3419 belongs to Diodes' high-density DC-DC converter product line, engineered specifically for space- and efficiency-critical portable and embedded systems requiring reliable 2A step-down regulation from single-cell batteries or low-voltage rails.

FAQ

What is the minimum output voltage achievable with AP3419KTTR-G1?

The AP3419KTTR-G1 supports an output voltage range from 0.6V to VIN, with the 0.6V feedback reference voltage setting the lower limit. Using standard 1% resistors in the FB divider, outputs as low as 0.6V can be accurately regulated-enabling direct supply to low-voltage logic cores, DDR termination rails, or sensor analog front-ends without additional post-regulation stages.

Does AP3419KTTR-G1 require external compensation components?

No. The AP3419KTTR-G1 integrates full Type-II compensation circuitry, eliminating the need for external capacitors or resistors in the feedback loop. This simplifies design, reduces bill-of-materials cost, and improves production yield by removing layout-sensitive compensation networks-verified across all recommended operating conditions in the DS36543 datasheet.

How does the short-circuit protection operate on AP3419KTTR-G1?

When FB voltage drops below 0.3V due to output shorting, the AP3419KTTR-G1 enters hiccup mode: it disables switching, waits ~50ms, then attempts restart. If the fault persists, the cycle repeats. Recovery occurs automatically once FB rises above 0.3V, requiring no external reset signal-ensuring robustness in unattended systems like remote sensors or network infrastructure equipment.

Can AP3419KTTR-G1 operate with 100% duty cycle, and what is its practical benefit?

Yes. The AP3419KTTR-G1 supports true 100% duty cycle operation, allowing V_OUT to track V_IN minus only the R_DS(ON) × I_LOAD drop. This is essential for maintaining regulation as battery voltage declines-e.g., sustaining 3.3V output from a Li+ cell discharging from 4.2V to 3.4V without dropout or brownout, extending usable battery capacity in portable devices.

AP3419KTTR-G1 Specifications

Product attributes: Attribute value

Manufacturer:: Diodes Incorporated

Series:: -

Package/Case:: SOT-23-6 Thin, TSOT-23-6

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):: 0.6V

Voltage - Output (Max):: 5.5V

Current - Output:: 2A

Frequency - Switching:: 1MHz

Synchronous Rectifier:: Yes

Operating Temperature:: -40°C ~ 85°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: TSOT-26

AP3419KTTR-G1 FAQ

1.How can I place an order for AP3419KTTR-G1 through Aetrix?

Please submit a Request for Quotation (RFQ) for AP3419KTTR-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 AP3419KTTR-G1 reliable?

The price and inventory of AP3419KTTR-G1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP3419KTTR-G1 is usually 5 days.

3.What payment methods are accepted for AP3419KTTR-G1?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP3419KTTR-G1 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for AP3419KTTR-G1?

AP3419KTTR-G1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your AP3419KTTR-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 AP3419KTTR-G1?

For technical support, including AP3419KTTR-G1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP3419KTTR-G1 requirements.

6.How does Aetrix verify that AP3419KTTR-G1 is sourced from the original manufacturer or authorized distributors?

All AP3419KTTR-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 AP3419KTTR-G1 meets industry standards.

7.What is the process for return or replacement of AP3419KTTR-G1?

All AP3419KTTR-G1 units undergo pre-shipment inspection (PSI). If there is an issue with AP3419KTTR-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 AP3419KTTR-G1 part is unused and in its original packaging.

Return procedure for AP3419KTTR-G1:

1.Submit a request within 90 days.

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

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