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

Diodes Incorporated AP3211KTR-G1

Name: AP3211KTR-G1
Brand: Diodes Incorporated
SKU: AP3211KTR-G1
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: AP3211KTR-G1

Manufacturer:: Diodes Incorporated

Category:: Voltage Regulators - DC DC Switching Regulators

Package:: SOT-23-6

Datasheet:: AP3211KTR-G1.pdf

Description:: IC REG BUCK ADJ 1.5A SOT23-6

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Product details

Overview

AP3211KTR-G1 from Diodes Incorporated is a 1.4MHz fixed-frequency, current-mode asynchronous DC-DC buck converter in SOT-23-6 package, integrating a low-R_DS(ON) N-channel power MOSFET switch. It delivers up to 1.5A output current with adjustable output voltage (0.81V–15V) from 4.5V–18V input, achieving up to 92% efficiency in LCD TV and portable DVD power rails.

For engineers reviewing the AP3211KTR-G1 datasheet, AP3211KTR-G1 pinout, AP3211KTR-G1 application, or AP3211KTR-G1 equivalent, key selection criteria include bootstrap-based high-side drive capability, cycle-by-cycle current limiting, integrated OVP/UVP/thermal shutdown, and soft-start timing of 200µs for stable 3.3V/1.5A point-of-load regulation.

Technical Context

The AP3211 operates as a constant-frequency current-mode PWM controller with internal 1.4MHz oscillator and ramp generator, enabling fast transient response and inherent cycle-by-cycle overcurrent protection. Its bootstrap gate drive architecture supports high-side NMOS switching without external high-voltage bias circuitry.

Feedback regulation uses a precision 0.81V reference with ±2.5% tolerance over temperature; OVP triggers at 0.972V on FB pin, while short-circuit protection reduces frequency to 460kHz when FB falls below 0.25V. UVLO activates at 3.8V (rising) with 0.2V hysteresis.

Key Specifications

Parameter	Value and Actual Design Meaning
Switching Frequency	Fixed 1.4MHz - enables compact magnetics and low-output-ripple design with standard 4.7µH inductors
Output Current	1.5A continuous - supports mid-power applications like LCD bias rails and portable media supply
Input Voltage Range	4.5V to 18V - compatible with 5V, 12V, and 15V intermediate bus architectures
Feedback Reference	0.81V ±2.5% - sets output via external resistor divider; enables precise 3.3V/5V/12V regulation
R_DS(ON)	0.35Ω typical - minimizes conduction loss at full load, contributing to 92% peak efficiency
Soft-Start Time	200µs - controls inrush current during power-up, preventing input rail sag and output overshoot
Quiescent Current	0.8mA typical - ensures low standby power in always-on subsystems
Thermal Shutdown	160°C with 20°C hysteresis - protects IC under sustained overload or poor PCB thermal design

Pinout & Package

SOT-23-6 package with 1.0mm pitch, 2.82mm × 2.9mm footprint, and exposed pad not electrically connected. Thermal resistance θ_JA = 220°C/W.

Pin/Terminal	Circuit Role	Design Meaning
1 (BS)	Bootstrap supply	Connects external capacitor to SW to generate gate drive voltage > VIN for internal high-side NMOS
2 (GND)	Power ground	Reference return for control circuitry and power stage; must be low-impedance connection to input/output capacitors
3 (FB)	Voltage feedback input	Monitors output via resistor divider; regulates output by comparing to 0.81V internal reference
4 (EN)	Enable control	Logic-level input: >1.5V enables operation; <0.4V disables IC, reducing supply current to <1µA
5 (IN)	Main power input	Accepts 4.5–18V DC; requires local 10µF ceramic capacitor to suppress high-frequency ripple
6 (SW)	Power switch node	Drives external inductor; connects to BS capacitor and internal NMOS drain; carries high di/dt switching current

Key Features

Feature	Design Value
Integrated N-channel MOSFET	R_DS(ON) = 0.35Ω eliminates need for external high-side switch and associated gate driver
Current-mode control	Enables inherent cycle-by-cycle current limiting and stable operation with wide output capacitor ESR range
Built-in protection suite	OCP, OVP (0.972V FB threshold), UVLO (3.8V), thermal shutdown (160°C), and soft-start prevent fault propagation
Bootstrap gate drive	Eliminates need for isolated bias supply; supports 100% duty cycle capability with proper capacitor sizing
Adjustable output voltage	0.81V to 15V via two-resistor FB divider - supports diverse system rail requirements without redesign

Applications

LCD TV Power Supply

Portable DVD Player

Use Scenario: Generating 3.3V/1.5A main logic rail from 12V intermediate bus in slim-panel LCD TVs.

IC Role / Device Role / Timing Role: Asynchronous buck converter providing regulated DC output with fast load-step response to video processor activity.

Use Value: High 92% efficiency reduces heat buildup in thermally constrained chassis; 1.4MHz switching allows use of small 4.7µH inductors.

Use Scenario: Delivering 5V/1.2A for MPEG decoder and display backlight driver in battery-powered DVD players.

IC Role / Device Role / Timing Role: Step-down regulator managing dynamic load transients during disc spin-up and video decode bursts.

Use Value: Built-in soft-start prevents battery voltage droop at power-on; EN pin enables system-level power sequencing.

Digital Photo Frame (DPF)

Set-Top Box USB Hub

Use Scenario: Providing 3.3V/1.0A for ARM Cortex-M microcontroller and TFT display interface in wall-mounted DPFs.

IC Role / Device Role / Timing Role: Primary DC-DC converter regulating output against varying ambient temperature and input line conditions.

Use Value: ±2.5% FB reference tolerance ensures consistent display brightness; thermal shutdown prevents damage during enclosure overheating.

Use Scenario: Supplying 5V/1.5A to downstream USB peripherals in low-cost STB designs with limited PCB area.

IC Role / Device Role / Timing Role: Compact buck solution replacing linear regulators to meet USB 2.0 power delivery specs efficiently.

Use Value: SOT-23-6 footprint saves >60% board space vs. SO-8 alternatives; integrated OVP protects connected USB devices from overvoltage faults.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
MP2307DN-LF-Z (Monolithic Power)	40V max input, 2A output, 340kHz–2MHz programmable frequency; no integrated bootstrap diode	Higher input voltage range suits industrial 24V systems; lower switching frequency increases inductor size	Select when >18V input or >1.5A output is required; verify external bootstrap diode placement
TPS562201 (Texas Instruments)	17V max input, 2A output, 500kHz fixed frequency, integrated high-side FET only (no bootstrap)	Uses integrated high-side FET with internal boot capacitor; simpler layout but less efficient at high duty cycles	Prefer for cost-sensitive consumer designs where 500kHz operation and smaller BOM outweigh efficiency trade-offs

Compared with MP2307DN-LF-Z and TPS562201, the AP3211KTR-G1 offers optimal balance of 1.4MHz switching, 1.5A capability, and bootstrap-driven high-side drive in the smallest footprint-ideal for space-constrained 12V-input consumer electronics requiring rapid transient response and robust fault protection.

Availability

AP3211KTR-G1 is available at Aetrix Electronics and suitable for LCD TV power rails, portable DVD player logic supplies, digital photo frame main rails, and set-top box USB hub regulation requiring stable component supply across production volumes.

Supply support for AP3211KTR-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 consumer, computing, and industrial markets.

The AP3211 belongs to Diodes' high-frequency synchronous/asynchronous buck converter product line, designed specifically for compact, cost-effective DC-DC conversion in space- and thermal-constrained consumer electronics with 4.5–18V input buses.

FAQ

What is the minimum recommended inductor value for AP3211KTR-G1 at 12V input and 3.3V/1.5A output?

The datasheet specifies a 4.7µH inductor optimized for 12V→3.3V conversion. This value ensures continuous conduction mode at full load, maintains peak-to-peak inductor ripple current below 30% of I_OUT, and aligns with the 1.4MHz switching frequency to limit core losses. Using smaller inductors risks entering discontinuous mode and increased output ripple.

How does the AP3211KTR-G1 implement overvoltage protection?

OVP is implemented internally by monitoring the FB pin voltage. When V_FB exceeds 0.972V-corresponding to ~20% above the 0.81V reference-the device immediately disables the power switch and enters hiccup mode. Recovery occurs automatically after fault removal, with no external components required beyond the standard feedback divider.

Can the AP3211KTR-G1 operate with 100% duty cycle?

No. Due to its bootstrap gate drive architecture, the AP3211 cannot sustain 100% duty cycle. The bootstrap capacitor requires periodic discharge/recharge through the SW node switching action. Minimum off-time is governed by t_ON (100ns) and oscillator period; practical maximum duty cycle is 90%, limiting minimum output voltage to ~VIN × 0.9 under heavy load.

What is the role of the BS pin, and what capacitor value is recommended between BS and SW?

The BS pin provides gate drive voltage to the internal high-side NMOS switch via a bootstrap capacitor connected to SW. A 0.1µF X7R ceramic capacitor is recommended-placed as close as possible to BS and SW pins-to ensure sufficient charge transfer during each switching cycle and maintain stable gate drive under full-load conditions.

AP3211KTR-G1 Specifications

Product attributes: Attribute value

Manufacturer:: Diodes Incorporated

Series:: -

Package/Case:: SOT-23-6

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):: 4.5V

Voltage - Input (Max):: 18V

Voltage - Output (Min/Fixed):: 0.81V

Voltage - Output (Max):: 15V

Current - Output:: 1.5A

Frequency - Switching:: 1.4MHz

Synchronous Rectifier:: No

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

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: SOT-23-6

AP3211KTR-G1 FAQ

1.How can I place an order for AP3211KTR-G1 through Aetrix?

Please submit a Request for Quotation (RFQ) for AP3211KTR-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 AP3211KTR-G1 reliable?

The price and inventory of AP3211KTR-G1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP3211KTR-G1 is usually 5 days.

3.What payment methods are accepted for AP3211KTR-G1?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP3211KTR-G1 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for AP3211KTR-G1?

AP3211KTR-G1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your AP3211KTR-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 AP3211KTR-G1?

For technical support, including AP3211KTR-G1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP3211KTR-G1 requirements.

6.How does Aetrix verify that AP3211KTR-G1 is sourced from the original manufacturer or authorized distributors?

All AP3211KTR-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 AP3211KTR-G1 meets industry standards.

7.What is the process for return or replacement of AP3211KTR-G1?

All AP3211KTR-G1 units undergo pre-shipment inspection (PSI). If there is an issue with AP3211KTR-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 AP3211KTR-G1 part is unused and in its original packaging.

Return procedure for AP3211KTR-G1:

1.Submit a request within 90 days.

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

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