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

Diodes Incorporated AP3401DNTR-G1

Name: AP3401DNTR-G1
Brand: Diodes Incorporated
SKU: AP3401DNTR-G1
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: AP3401DNTR-G1

Manufacturer:: Diodes Incorporated

Category:: Voltage Regulators - DC DC Switching Regulators

Package:: 6-UDFN Exposed Pad

Datasheet:: AP3401DNTR-G1.pdf

Description:: IC REG BUCK ADJ 1A UDFN20206

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Product details

Overview

AP3401DNTR-G1 from Diodes Incorporated is a 1.5MHz, 1A synchronous step-down DC-DC buck converter with integrated high- and low-side MOSFETs, 0.6V reference voltage (±2% precision), 40μA no-load quiescent current, and 100% duty-cycle capability. It operates from 2.5V–5.5V input and delivers adjustable output from 0.6V to VIN, targeting post-regulation in portable Li+/Li-polymer-powered systems.

For engineers reviewing the AP3401DNTR-G1 datasheet, AP3401DNTR-G1 pinout, AP3401DNTR-G1 application, or AP3401DNTR-G1 equivalent, key selection criteria include its ultra-low R_DS(ON) (250mΩ HS / 170mΩ LS), pulse-skip light-load efficiency mode, integrated soft-start, and dual-package availability (U-DFN2020-6 and TSOT26) for space-constrained designs.

Technical Context

The AP3401 employs a constant-frequency PWM control architecture with internal slope compensation and anti-shoot-through logic to ensure stable operation across 2.5V–5.5V input and full 0–1A load range. Its error amplifier compares FB voltage against a trimmed 0.6V reference, driving switching logic that controls both integrated power MOSFETs.

Functional blocks include UVLO (2.4V threshold with 0.1V hysteresis), thermal shutdown at +160°C (with +15°C hysteresis), hiccup-mode short-circuit protection triggered at V_FB < 0.42V, and open-drain PG output indicating regulation status within ±20% of target. The 1.5MHz oscillator enables compact external LC filtering.

Key Specifications

Parameter	Value and Actual Design Meaning
Input Voltage Range	2.5V to 5.5V - supports single-cell Li+/Li-polymer, multi-cell alkaline/NiMH, and USB-powered systems without pre-regulation.
Output Current	1A maximum continuous - sufficient for core logic rails in portable computing and set-top boxes.
Switching Frequency	1.5MHz fixed - allows use of small 2.2μH inductors and 10μF ceramic output capacitors for minimal board area.
Reference Voltage	0.6V ±2% - enables precise output setting via resistor divider; accuracy directly determines output voltage tolerance.
Quiescent Current	40μA typical at no load - extends battery runtime in always-on or low-power standby modes.
R_DS(ON) (HS/LS)	250mΩ / 170mΩ at 100mA - reduces conduction loss and improves full-load efficiency, especially at high duty cycles.
Shutdown Current	<1μA - isolates input from output during system sleep, preventing battery drain.

Pinout & Package

AP3401DNTR-G1 is packaged in U-DFN2020-6 (Type J), a 2.0mm × 2.0mm, 0.65mm pitch, thermally enhanced lead-free package with exposed thermal pad. Pin 1 marked by dot; top-side marking "CP".

Pin/Terminal	Circuit Role	Design Meaning
1 (EN)	Enable control input	Logic-high (>1.5V) enables regulation; logic-low (<0.4V) disables IC and disconnects input from output.
2 (PG)	Power-good open-drain indicator	Pulled low when V_FB deviates >±20% from 0.6V; requires external pull-up to VIN for status monitoring.
3 (VIN)	Main power supply input	Bias and switch supply rail; accepts 2.5V–5.5V; includes UVLO and input OVP (6.25V trip).
4 (FB)	Feedback node to error amplifier	Resistor-divider connection point; internal 0.6V reference sets output: V_OUT = 0.6V × (1 + R1/R2).
5 (GND)	Power and signal ground	Common return for internal circuitry, power switches, and external components; must be low-impedance.
6 (LX)	Switch node	Connection to drains of internal high- and low-side MOSFETs; drives external inductor; requires low-inductance layout.

Key Features

Feature	Design Value
No external compensation required	Internally compensated error amplifier eliminates need for external RC network, reducing BOM count and layout sensitivity.
Pulse-skip mode at light load	Maintains >80% efficiency down to 10mA load by skipping switching cycles instead of forcing continuous PWM, minimizing idle power loss.
100% duty-cycle operation	Enables V_OUT ≈ V_IN – I_LOAD×R_DS(ON), critical for low-dropout applications like 3.3V→3.0V post-regulation.
Integrated thermal and SCP protection	Auto-recovery hiccup mode on short circuit and +160°C shutdown with +145°C restart threshold prevent damage during fault conditions.
Ultra-low shutdown current	<1μA shutdown leakage ensures negligible battery drain in powered-off states, essential for long-life portable devices.

Applications

Post DC-DC Voltage Regulation

Set Top Boxes

Use Scenario: Final-stage regulation after primary DC-DC conversion in multi-rail power systems.

IC Role / Device Role / Timing Role: Synchronous buck regulator providing clean, tightly regulated 1.2V or 1.8V core voltage for SoC or FPGA.

Use Value: 40μA quiescent current and 100% duty cycle enable efficient low-V_IN/low-V_OUT conversion without dropout penalty.

Use Scenario: Power management for digital video processing and HDMI interface subsystems.

IC Role / Device Role / Timing Role: Secondary buck converter delivering 3.3V or 2.5V to peripheral ICs with fast transient response.

Use Value: 1.5MHz switching frequency and integrated MOSFETs reduce solution size and improve load-step recovery vs. lower-frequency alternatives.

Notebook Computer

PAD Devices

Use Scenario: Battery-powered CPU/GPU core rail or memory I/O supply in thin-and-light notebooks.

IC Role / Device Role / Timing Role: High-efficiency step-down regulator operating from single-cell Li+ (2.7–4.2V) to 1.0V–1.5V outputs.

Use Value: 250mΩ/170mΩ R_DS(ON) minimizes conduction loss at 1A, sustaining >90% efficiency across battery discharge curve.

Use Scenario: Compact power delivery for display backlight drivers, touch controllers, and wireless connectivity modules.

IC Role / Device Role / Timing Role: Space-optimized buck converter in 2.0mm × 2.0mm U-DFN2020-6 package for ultra-thin tablet PCBs.

Use Value: Small footprint and thermal pad enable high power density without heatsinks, meeting strict thickness constraints.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
MP2158DJ-LF-Z (Monolithic Power)	1.5MHz, 1A, 2.5–5.5V input, but uses external compensation and lacks PG pin.	No power-good reporting; requires additional circuitry for system sequencing or fault detection.	Choose if compensation tuning is needed; avoid if PG monitoring or simplified layout is required.
TPS62231DRYR (Texas Instruments)	3MHz, 0.6–5.5V input, 600mA max, 17μA IQ, but smaller 6-pin WSON package and no 100% duty cycle.	Limited to sub-1A loads and cannot support V_OUT ≥ V_IN − drop; better for ultra-low-IQ microprocessor rails.	Prefer for higher-frequency, lower-current applications where board space is more constrained than current capability.

Compared with MP2158DJ-LF-Z and TPS62231DRYR, the AP3401DNTR-G1 uniquely combines 1A capability, 100% duty cycle, integrated PG, and zero-compensation design-making it optimal for cost-sensitive, space-limited, battery-powered buck applications requiring robust fault reporting and wide input/output flexibility.

Availability

AP3401DNTR-G1 is available at Aetrix Electronics and suitable for post-regulation, set-top box power, notebook computer subsystems, and PAD device power management requiring stable component supply, RoHS/Green compliance, and consistent tape-and-reel delivery.

Supply support for AP3401DNTR-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-performance, energy-efficient power management and signal integrity solutions for consumer, computing, and industrial markets.

The AP3401 belongs to Diodes' high-efficiency DC-DC converter product line, designed specifically for compact, battery-operated devices needing reliable, low-quiescent-current step-down regulation with minimal external components.

FAQ

What is the minimum recommended output capacitor value for stable operation?

The AP3401 datasheet specifies 10μF ceramic output capacitance as standard for stability across all operating conditions. Lower values may cause instability or excessive output ripple; X5R/X7R dielectrics with ≤10mΩ ESR are required to maintain phase margin and transient response per the typical application circuit.

Does AP3401DNTR-G1 support forced PWM mode, or is pulse-skipping the only light-load option?

The AP3401 operates exclusively in pulse-skip mode at light loads; it does not offer a forced-PWM or PFM/PWM hybrid mode. Pulse-skip ensures high efficiency down to ~10mA while maintaining regulation, but introduces variable-frequency behavior that may require additional EMI filtering in noise-sensitive applications.

How is the power-good (PG) pin used in system power sequencing?

The PG pin is an open-drain output pulled low when V_FB falls outside 80–120% of 0.6V. To implement sequencing, connect PG to a microcontroller GPIO or PMIC enable input via a pull-up to VIN; system firmware waits for PG high before releasing downstream resets or enabling dependent rails.

Can AP3401DNTR-G1 operate with input voltage below 2.5V?

No-2.5V is the absolute minimum input voltage per Recommended Operating Conditions. Below this, UVLO prevents startup, and internal bias circuits fail to function reliably. Operation at 2.4V or lower risks erratic behavior, failure to regulate, or uncontrolled shutdown due to undervoltage lockout activation.

AP3401DNTR-G1 Specifications

Product attributes: Attribute value

Manufacturer:: Diodes Incorporated

Series:: -

Package/Case:: 6-UDFN Exposed Pad

Packaging:: Tape & Reel (TR)

Product Status:: Active

Function:: Step-Down

Output Configuration:: Positive

Topology:: Buck

Output Type:: Adjustable

Number of Outputs:: 1

Voltage - Input (Min):: 2.5V

Voltage - Input (Max):: 5.5V

Voltage - Output (Min/Fixed):: 1V

Voltage - Output (Max):: 5V

Current - Output:: 1A

Frequency - Switching:: 1.5MHz

Synchronous Rectifier:: Yes

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

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: U-DFN2020-6 (Type J)

AP3401DNTR-G1 FAQ

1.How can I place an order for AP3401DNTR-G1 through Aetrix?

Please submit a Request for Quotation (RFQ) for AP3401DNTR-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 AP3401DNTR-G1 reliable?

The price and inventory of AP3401DNTR-G1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP3401DNTR-G1 is usually 5 days.

3.What payment methods are accepted for AP3401DNTR-G1?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP3401DNTR-G1 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for AP3401DNTR-G1?

AP3401DNTR-G1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your AP3401DNTR-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 AP3401DNTR-G1?

For technical support, including AP3401DNTR-G1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP3401DNTR-G1 requirements.

6.How does Aetrix verify that AP3401DNTR-G1 is sourced from the original manufacturer or authorized distributors?

All AP3401DNTR-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 AP3401DNTR-G1 meets industry standards.

7.What is the process for return or replacement of AP3401DNTR-G1?

All AP3401DNTR-G1 units undergo pre-shipment inspection (PSI). If there is an issue with AP3401DNTR-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 AP3401DNTR-G1 part is unused and in its original packaging.

Return procedure for AP3401DNTR-G1:

1.Submit a request within 90 days.

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

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