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Diodes Incorporated AP3428KTTR-G1
- Part No.:
- AP3428KTTR-G1
- Manufacturer:
- Diodes Incorporated
- Package:
- SOT-23-5 Thin, TSOT-23-5
- Datasheet:
-
AP3428KTTR-G1.pdf
- Description:
- IC REG BUCK ADJ 1A TSOT25
- Quantity:
- Payment:
- Shipping:
Inventory:225,243
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Product details
Overview
AP3428KTTR-G1 from Diodes Incorporated is a 1.5MHz, 1A synchronous step-down DC-DC buck converter with internal high- and low-side MOSFETs (RDS(ON) = 250 mΩ / 170 mΩ), 0.6V ±2% reference voltage, 40µA no-load quiescent current, and 100% duty-cycle capability-designed for Li+/Li-polymer-powered portable electronics requiring high efficiency across light-to-heavy loads.
For engineers reviewing the AP3428KTTR-G1 datasheet, AP3428KTTR-G1 pinout, AP3428KTTR-G1 application, or AP3428KTTR-G1 equivalent, key selection considerations include input voltage range (2.5–5.5V), adjustable output (0.6V to VIN), thermal shutdown (+160°C), short-circuit hiccup protection, and TSOT25 package compatibility with space-constrained PCB layouts.
Technical Context
The AP3428KTTR-G1 employs constant-frequency PWM control at 1.5MHz with internal slope compensation and cycle-by-cycle current limiting, enabling stable regulation under dynamic load transients up to 1A. Its integrated synchronous rectifier eliminates external diode losses and supports 100% duty-cycle operation for ultra-low dropout.
Functional blocks include a precision 0.6V bandgap reference, soft-start timer (2ms), undervoltage lockout (2.4V threshold with 0.1V hysteresis), and independent EN pin logic (1.5V turn-on, 0.4V shutdown) that disconnects input from output with <1µA shutdown current.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 1.5MHz - Enables compact LC filter design with 2.2µH inductor and 10µF output capacitor. |
| Output Current | 1A continuous - Delivered with internal MOSFETs; peak inductor current limit is 1.3A. |
| Input Voltage Range | 2.5V to 5.5V - Supports single-cell Li+/Li-polymer, dual/multi-cell alkaline/NiMH, and USB-powered systems. |
| Feedback Reference | 0.6V ±2% - Sets output via resistor divider; enables precise 1.0V–3.3V regulation with minimal error. |
| Quiescent Current | 40µA typical - Maintains high light-load efficiency via pulse-skip mode without external bias circuitry. |
| Shutdown Current | <1µA - Ensures battery preservation during system sleep; EN pin fully isolates VIN from VOUT. |
| Thermal Protection | +160°C trip, +145°C recovery - Auto-restarts after junction cooling; prevents permanent damage in sealed enclosures. |
Pinout & Package
AP3428KTTR-G1 is packaged in TSOT25 (3.0mm × 2.8mm × 0.9mm), a thermally enhanced 5-pin leaded surface-mount package with exposed pad (L2H marking code). Pin 1 is marked by a dot; pin 5 is GND.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (EN) | Enable control input | Logic-level interface: ≥1.5V enables regulation; ≤0.4V forces full shutdown with <1µA draw. |
| 2 (GND) | Power ground | Primary return path for IC bias, power switch, and feedback network; connects to thermal pad. |
| 3 (LX) | Switch node | Drain connection of internal high- and low-side MOSFETs; requires low-inductance layout to minimize EMI. |
| 4 (VIN) | Main power supply | Accepts 2.5–5.5V input; must be decoupled with ≥10µF ceramic capacitor placed adjacent to pin. |
| 5 (FB) | Feedback input | Senses output via resistor divider; internal 0.6V reference sets VOUT = 0.6V × (1 + R1/R2). |
Key Features
| Feature | Design Value |
|---|---|
| No external compensation required | Internal Type-II compensation ensures stability with standard 2.2µH/10µF output filter-no loop tuning needed. |
| Synchronous rectification | Integrated 250mΩ/170mΩ MOSFET pair eliminates Schottky loss, achieving >90% efficiency at 500mA load (VIN=5V, VOUT=1.8V). |
| Pulse-skip light-load mode | Maintains >85% efficiency at 10mA load by reducing switching frequency while preserving regulation accuracy. |
| 100% duty-cycle operation | Supports VOUT ≈ VIN (e.g., 4.8V out from 5V input), critical for low-dropout post-regulation in battery-fed systems. |
| Robust protection suite | Combines hiccup-mode short-circuit response, thermal shutdown with hysteresis, and UVLO to prevent deep battery discharge. |
Applications
| Portable Power Management | USB-Powered Peripherals |
|---|---|
|
Use Scenario: Regulating 3.3V or 1.8V rails from single Li-ion cell (3.0–4.2V) in Bluetooth headsets and wearables. IC Role / Device Role / Timing Role: Primary buck regulator delivering 1A peak current with <40µA quiescent draw to extend battery life. Use Value: 100% duty-cycle capability maintains output during battery sag below 3.3V; pulse-skip mode sustains >87% efficiency at 50µA load. |
Use Scenario: Generating stable 1.2V core voltage for microcontrollers in USB-C powered dongles and adapters. IC Role / Device Role / Timing Role: Input-supervised buck converter accepting 4.75–5.25V USB input, with UVLO preventing brownout resets. Use Value: 1.5MHz switching allows use of tiny 1.0×0.5mm inductors; TSOT25 footprint fits sub-100mm² PCB area budgets. |
| Notebook Subsystem Supply | Set-Top Box SoC Core Rail |
|
Use Scenario: Providing 1.05V/1.2V DDR memory termination or display driver supply in ultrabooks. IC Role / Device Role / Timing Role: Secondary buck stage downstream of main PMIC, handling transient loads up to 1A with fast response. Use Value: Internal soft-start (2ms) prevents inrush current; 1.3A OCP protects against shorted memory modules during hot-plug events. |
Use Scenario: Delivering 1.1V core voltage to ARM-based media processors in cable/satellite STBs. IC Role / Device Role / Timing Role: High-efficiency point-of-load regulator operating continuously at 800mA with thermal margin up to +85°C ambient. Use Value: TSOT25 package's 220°C/W θJA enables passive cooling; overtemperature protection prevents thermal runaway in enclosed chassis. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP2158GQZ-P | 2MHz switching, 0.6V ref, but requires external compensation; 300mΩ/200mΩ RDS(ON); no 100% duty-cycle support. | Limited to fixed-output variants; less suitable for battery-sag scenarios requiring VOUT ≈ VIN. | Choose when higher frequency allows smaller magnetics, and board space permits compensation components. |
| RT7290BZSP | 1.5MHz, 1A, 0.6V ref, but uses external MOSFETs; 45µA IQ; includes power-good flag. | Higher BOM count and layout complexity; better for designs needing PG monitoring or thermal derating flexibility. | Prefer when system-level fault reporting is mandatory, or when thermal management requires discrete FET heatsinking. |
Compared with MP2158GQZ-P and RT7290BZSP, AP3428KTTR-G1 uniquely combines no-compensation design, 100% duty-cycle operation, and TSOT25 integration-making it optimal for cost-sensitive, space-constrained Li+-fed devices where simplicity and dropout resilience are critical.
Availability
AP3428KTTR-G1 is available at Aetrix Electronics and suitable for portable power management, USB-powered peripherals, and notebook subsystem supply requiring stable component supply, RoHS/Green compliance, and production-ready tape-and-reel packaging (3000 pcs/reel).
Supply support for AP3428KTTR-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 automotive markets.
The AP3428 series belongs to Diodes' high-density DC-DC converter product line, engineered specifically for battery-operated portable electronics demanding ultra-low IQ, small footprint, and robust protection in TSOT25 packaging.
FAQ
What is the minimum input voltage required for AP3428KTTR-G1 to regulate a 1.8V output?
The AP3428KTTR-G1 requires a minimum input voltage of 2.5V per its recommended operating conditions. At 1.8V output, this provides sufficient headroom for the internal MOSFETs' RDS(ON) drop and control circuitry. Operation below 2.5V triggers UVLO, halting switching until VIN rises above 2.7V (UVLO release threshold).
Can AP3428KTTR-G1 operate without an external soft-start capacitor?
Yes. The AP3428KTTR-G1 integrates a 2ms internal soft-start timer, eliminating the need for external capacitors. This ensures controlled output ramp-up, prevents inrush current into downstream capacitance, and avoids false triggering of system reset circuits during power-on.
How does the hiccup-mode short-circuit protection behave during sustained overload?
When FB falls below 0.42V due to output short, the AP3428KTTR-G1 enters hiccup mode: it disables switching for ~20ms, then attempts restart. If the short persists, it repeats the cycle. This limits average power dissipation to safe levels (<100mW) and prevents thermal damage without requiring manual reset.
Is the TSOT25 package of AP3428KTTR-G1 compatible with standard reflow profiles?
Yes. The TSOT25 package is rated Moisture Sensitivity Level 3 (MSL3) per J-STD-020 and qualified for standard Pb-free reflow profiles (peak 260°C). Its tin-plated leads meet MIL-STD-202 solderability requirements, and the recommended pad layout (C=0.95mm, X=0.70mm, Y=1.00mm) ensures reliable solder joint formation.
AP3428KTTR-G1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- SOT-23-5 Thin, TSOT-23-5
- 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 ~ 80°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TSOT-25
AP3428KTTR-G1 FAQ
1.How can I place an order for AP3428KTTR-G1 through Aetrix?
Please submit a Request for Quotation (RFQ) for AP3428KTTR-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 AP3428KTTR-G1 reliable?
The price and inventory of AP3428KTTR-G1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP3428KTTR-G1 is usually 5 days.
3.What payment methods are accepted for AP3428KTTR-G1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP3428KTTR-G1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP3428KTTR-G1?
AP3428KTTR-G1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP3428KTTR-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 AP3428KTTR-G1?
For technical support, including AP3428KTTR-G1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP3428KTTR-G1 requirements.
6.How does Aetrix verify that AP3428KTTR-G1 is sourced from the original manufacturer or authorized distributors?
All AP3428KTTR-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 AP3428KTTR-G1 meets industry standards.
7.What is the process for return or replacement of AP3428KTTR-G1?
All AP3428KTTR-G1 units undergo pre-shipment inspection (PSI). If there is an issue with AP3428KTTR-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 AP3428KTTR-G1 part is unused and in its original packaging.
Return procedure for AP3428KTTR-G1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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