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Diodes Incorporated AP3401KTTR-G1
- Part No.:
- AP3401KTTR-G1
- Manufacturer:
- Diodes Incorporated
- Package:
- SOT-23-6 Thin, TSOT-23-6
- Datasheet:
-
AP3401KTTR-G1.pdf
- Description:
- IC REG BUCK ADJ 1A TSOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:49,655
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Product details
Overview
AP3401KTTR-G1 from Diodes Incorporated is a 1.5 MHz, 1 A synchronous step-down DC-DC buck converter with internal high- and low-side MOSFETs, 0.6 V ±2% reference voltage, 40 µA no-load quiescent current, and 100% duty cycle capability. It operates from 2.5 V to 5.5 V input and delivers adjustable output from 0.6 V to VIN, targeting post-regulation in portable Li+-powered systems.
For engineers reviewing the AP3401KTTR-G1 datasheet, AP3401KTTR-G1 pinout, AP3401KTTR-G1 application, or AP3401KTTR-G1 equivalent, key selection criteria include its ultra-low shutdown current (<1 µA), integrated soft-start, absence of external compensation, and dual-package availability (TSOT26/U-DFN2020-6) for space-constrained designs.
Technical Context
The AP3401KTTR-G1 implements a constant-frequency PWM control architecture with slope compensation and anti-shoot-through logic to ensure stable operation across load transients. Its error amplifier compares FB against a precision 0.6 V internal reference, driving switching logic that controls integrated 250 mΩ (HS) and 170 mΩ (LS) MOSFETs.
Functional blocks include UVLO (2.4 V threshold with 0.1 V hysteresis), thermal shutdown at +160 °C with +15 °C hysteresis, hiccup-mode short-circuit protection triggered at FB < 0.42 V, and open-drain PG monitoring with 80–120% regulation window detection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.5 V to 5.5 V - supports single-cell Li+/Li-Po, dual Alkaline/NiMH, or USB-powered systems without pre-regulation. |
| Output Voltage Range | 0.6 V to VIN - enables low-voltage core rails (e.g., 0.9 V for modern SoCs) and high-VOUT configurations up to input rail. |
| Switching Frequency | 1.5 MHz - allows use of compact 2.2 µH inductors and 10 µF ceramic output capacitors, minimizing board area. |
| Max Output Current | 1 A continuous - sustained under thermal limits in TSOT26 (θJA = 220 °C/W) or U-DFN2020-6 (θJA = 53 °C/W). |
| Quiescent Current | 40 µA typical - extends battery runtime in always-on subsystems such as real-time clocks or sensor wake-up circuits. |
| Reference Voltage | 0.6 V ±2% - ensures ±20 mV accuracy in feedback loop, enabling tight output regulation (e.g., ±1.2% at 1.2 V). |
| Shutdown Current | <1 µA - isolates input from output during deep sleep, preventing battery drain in standby modes. |
Pinout & Package
AP3401KTTR-G1 is packaged in TSOT26 (3.0 × 2.9 × 0.9 mm) with exposed pad for thermal enhancement. Pin assignments are validated per Diodes DS37389 Rev. 2-2.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN (Pin 1) | Enable control input | Logic-high (>1.5 V) activates regulator; logic-low (<0.4 V) disables with <1 µA supply current and input-output isolation. |
| GND (Pin 2) | Power ground reference | Common return path for IC bias, power switch sources, and feedback network; requires low-impedance PCB connection. |
| LX (Pin 3) | Switch node | Drain connection of internal high- and low-side MOSFETs; directly interfaces with inductor and catch diode (if used). |
| VIN (Pin 4) | Main power input | Bias supply for internal circuitry and gate drivers; must be decoupled with ≥10 µF ceramic capacitor placed adjacent to pin. |
| PG (Pin 5) | Power-good indicator | Open-drain output pulled high via external resistor to VIN; asserts low when VOUT deviates >20% from target (FB outside 0.48–0.72 V). |
| FB (Pin 6) | Feedback input | Connects to resistor divider from VOUT; internal 0.6 V reference sets regulation point; leakage ≤0.2 µA minimizes divider error. |
Key Features
| Feature | Design Value |
|---|---|
| No external compensation required | Internal type-II compensation eliminates need for external RC network, reducing BOM count and layout sensitivity. |
| 100% duty cycle operation | Enables dropout-free regulation down to VOUT ≈ VIN − IOUT × RDS(ON)_HS, critical for high-efficiency LDO-like behavior at light loads. |
| Pulse-skip mode at light load | Maintains >85% efficiency at 10 mA output by skipping switching cycles, avoiding linear-mode losses of forced-PWM alternatives. |
| Integrated soft-start (2 ms) | Controls output ramp rate to prevent inrush current, eliminate overshoot, and avoid false triggering of downstream POR circuits. |
| Thermal shutdown with hysteresis | Shuts down at TJ = +160 °C and auto-restarts at +145 °C, enabling safe recovery without system-level intervention. |
Applications
| Portable Notebook Core Rail | USB-Powered Set-Top Box |
|---|---|
|
Use Scenario: Regulating 1.2 V CPU core voltage from a 5 V USB input in fanless notebook designs. IC Role / Device Role / Timing Role: Primary synchronous buck controller delivering 1 A with fast transient response to dynamic CPU load steps. Use Value: 1.5 MHz switching enables small 2.2 µH inductor and 10 µF output cap, reducing solution size by >35% vs. 500 kHz alternatives. |
Use Scenario: Generating stable 3.3 V for HDMI PHY and demodulator ICs in low-cost STB platforms powered from 5 V USB-C or wall adapter. IC Role / Device Role / Timing Role: Post-regulator ensuring clean, low-noise 3.3 V supply despite upstream adapter ripple and load variation. Use Value: 40 µA quiescent current extends standby time; PG signal enables firmware-controlled power sequencing and fault reporting. |
| Li+-Powered IoT Sensor Hub | Industrial Tablet PMIC Sub-Block |
|
Use Scenario: Powering ultra-low-power microcontroller and BLE radio from a single 3.7 V Li+ cell with 0.9 V output. IC Role / Device Role / Timing Role: Efficient step-down converter operating down to 2.5 V input while maintaining regulation through full battery discharge curve. Use Value: 100% duty cycle allows VOUT = VIN − IOUT × 250 mΩ, sustaining 0.9 V output until cell voltage drops below 1.15 V. |
Use Scenario: Providing configurable 1.8 V I/O rail in ruggedized tablet designs requiring robust thermal management and fault signaling. IC Role / Device Role / Timing Role: High-reliability buck stage with thermal shutdown, short-circuit hiccup, and PG status for system health monitoring. Use Value: U-DFN2020-6 package (θJA = 53 °C/W) sustains 1 A continuous output at +85 °C ambient without derating. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP2108DJ-LF-Z (Monolithic Power) | Fixed 3.3 V output; 1.2 MHz switching; 0.8 V reference; no PG pin; 2.7–5.5 V input | Not adjustable; lacks power-good monitoring and 100% duty cycle; limited to fixed-VOUT use cases | Select only if fixed 3.3 V output suffices and PG signaling is unnecessary. |
| RT8059GJ6F (Richtek) | 1.5 MHz; 1 A; 0.6 V reference; PG pin; 2.5–5.5 V input; 45 µA IQ; TSOT23-6 package | Same functional scope but uses TSOT23-6 (larger θJA = 250 °C/W); no U-DFN2020-6 option | Prefer when TSOT23-6 footprint compatibility is required and thermal margin permits higher junction rise. |
Compared with MP2108DJ-LF-Z and RT8059GJ6F, the AP3401KTTR-G1 uniquely combines adjustable output, 100% duty cycle, dual-package support, and sub-1 µA shutdown current-making it optimal for battery-sensitive, space-constrained, and flexible-VOUT designs.
Availability
AP3401KTTR-G1 is available at Aetrix Electronics and suitable for portable notebook core rails, USB-powered set-top boxes, Li+-powered IoT sensor hubs, and industrial tablet PMIC sub-blocks requiring stable component supply and long-term lifecycle assurance.
Supply support for AP3401KTTR-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, industrial, and computing markets.
The AP3401 belongs to Diodes' high-frequency synchronous buck converter product line, engineered for compact, battery-efficient DC-DC conversion in space- and power-constrained portable electronics.
FAQ
What input voltage range does the AP3401KTTR-G1 support, and what power sources does it accommodate?
The AP3401KTTR-G1 supports an input voltage range of 2.5 V to 5.5 V. This enables direct operation from single-cell Li+/Li-polymer batteries (nominal 3.7 V, discharged to ~2.8 V), two Alkaline/NiMH cells (up to 3.2 V), or standard 5 V USB sources. Its 2.4 V UVLO threshold prevents deep battery discharge while maintaining functionality across the full usable cell voltage range.
How does the AP3401KTTR-G1 achieve high efficiency at light loads?
The AP3401KTTR-G1 employs pulse-skip mode at light loads, where switching cycles are skipped to reduce switching losses while maintaining regulation. Combined with 40 µA typical quiescent current and ultra-low RDS(ON) MOSFETs (250 mΩ HS / 170 mΩ LS), this enables >85% efficiency at 10 mA output-critical for battery longevity in always-on sensor and standby applications.
What is the function and electrical behavior of the PG (Power Good) pin?
The PG pin is an open-drain output that signals valid regulation: it is pulled low when FB falls below 0.48 V or rises above 0.72 V (±20% of 0.6 V reference), indicating VOUT is out of specification. When FB is within 0.54–0.66 V (±10%), the internal MOSFET turns off, allowing an external pull-up (to VIN) to assert high. This enables precise power sequencing and fault detection in multi-rail systems.
Can the AP3401KTTR-G1 operate with 100% duty cycle, and what design benefit does this provide?
Yes, the AP3401KTTR-G1 supports true 100% duty cycle operation. This allows VOUT to track VIN minus IOUT × RDS(ON)_HS, enabling near-dropout regulation-e.g., sustaining 0.9 V output even as input drops to ~1.15 V at 1 A. This eliminates the need for a separate LDO in battery-powered systems where minimum input voltage must be fully utilized.
AP3401KTTR-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:
- 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):
- 0.6V
- Voltage - Output (Max):
- 5.5V
- 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:
- TSOT-23-6
AP3401KTTR-G1 FAQ
1.How can I place an order for AP3401KTTR-G1 through Aetrix?
Please submit a Request for Quotation (RFQ) for AP3401KTTR-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 AP3401KTTR-G1 reliable?
The price and inventory of AP3401KTTR-G1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP3401KTTR-G1 is usually 5 days.
3.What payment methods are accepted for AP3401KTTR-G1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP3401KTTR-G1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP3401KTTR-G1?
AP3401KTTR-G1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP3401KTTR-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 AP3401KTTR-G1?
For technical support, including AP3401KTTR-G1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP3401KTTR-G1 requirements.
6.How does Aetrix verify that AP3401KTTR-G1 is sourced from the original manufacturer or authorized distributors?
All AP3401KTTR-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 AP3401KTTR-G1 meets industry standards.
7.What is the process for return or replacement of AP3401KTTR-G1?
All AP3401KTTR-G1 units undergo pre-shipment inspection (PSI). If there is an issue with AP3401KTTR-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 AP3401KTTR-G1 part is unused and in its original packaging.
Return procedure for AP3401KTTR-G1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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