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Diodes Incorporated AP3428AKTTR-G1
- Part No.:
- AP3428AKTTR-G1
- Manufacturer:
- Diodes Incorporated
- Package:
- SOT-23-5 Thin, TSOT-23-5
- Datasheet:
-
AP3428AKTTR-G1.pdf
- Description:
- IC REG BUCK ADJ 1A TSOT25
- Quantity:
- Payment:
- Shipping:
Inventory:149,897
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Product details
Overview
AP3428AKTTR-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 post-regulation in portable Li+-powered systems such as notebook computers and set-top boxes.
For engineers reviewing the AP3428AKTTR-G1 datasheet, AP3428AKTTR-G1 pinout, AP3428AKTTR-G1 application, or AP3428AKTTR-G1 equivalent, key selection criteria include input range (2.5–5.5V), adjustable output (0.6V to VIN), thermal shutdown at +160°C, UVLO hysteresis of 0.1V, and TSOT25 package compatibility with space-constrained PCB layouts.
Technical Context
The AP3428AKTTR-G1 employs constant-frequency PWM control with integrated error amplifier, slope compensation, and cycle-by-cycle current limiting. Its architecture supports pulse-skip mode under light load while maintaining regulation via a 0.6V feedback threshold and internal soft-start (2ms).
It integrates dual MOSFET power switches, eliminates external compensation, and features undervoltage lockout (2.4–2.7V threshold), short-circuit hiccup-mode recovery, and overtemperature protection with +15°C hysteresis - enabling robust operation across -40°C to +85°C ambient.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 1.5 MHz - enables compact LC filter design with ≤2.2µH inductors and 10µF output capacitance. |
| Output Current | 1 A continuous - supported by internal MOSFETs with RDS(ON) < 250 mΩ (HS) and < 170 mΩ (LS) at 100mA. |
| Input Voltage Range | 2.5 V to 5.5 V - compatible with single-cell Li+/Li-Po, two/three Alkaline/NiMH, and USB-powered rails. |
| Feedback Reference | 0.6 V ±2% - sets precise output voltage via external resistor divider; enables 0.6V minimum output. |
| Quiescent Current | 40 µA typical - minimizes battery drain in always-on subsystems without compromising startup time. |
| Shutdown Current | < 1 µA - disconnects input from output during disable, preventing battery depletion in standby. |
| Duty Cycle Range | 0–100% - supports dropout operation down to VOUT = VIN, critical for high-VOUT/low-VIN scenarios. |
Pinout & Package
AP3428AKTTR-G1 is packaged in TSOT25 (3.0 × 2.8 mm, 0.95 mm pitch), a thermally enhanced 5-pin leaded package with exposed pad for improved heat dissipation (θJA = 220°C/W). Pin 1 is EN; Pin 2 is GND; Pin 3 is LX; Pin 4 is VIN; Pin 5 is FB. NC pin is not bonded in this variant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN (Pin 1) | Enable control input | Logic-high (>1.5V) enables regulation; logic-low (<0.4V) disables IC and reduces IQ to <1µA. |
| GND (Pin 2) | Power and signal ground reference | Common return path for internal bias, error amplifier, and power switch sources. |
| LX (Pin 3) | Switch node | Drain connection of both internal high- and low-side MOSFETs; connects to inductor and catch diode path. |
| VIN (Pin 4) | Main power supply input | Bias rail for internal circuitry and high-side gate driver; requires local 10µF ceramic decoupling. |
| FB (Pin 5) | Feedback input | Connects to resistor divider output; internal 0.6V reference compares against this node to regulate VOUT. |
Key Features
| Feature | Design Value |
|---|---|
| No external compensation required | Integrated type-II compensation eliminates need for external RC network, reducing BOM count and layout sensitivity. |
| Internal soft-start (2ms) | Prevents inrush current and output overshoot during power-up; programmable via external capacitor not needed. |
| Synchronous rectification | Replaces external Schottky diode with low-RDS(ON) NMOS, improving efficiency by ≥8% at 1A vs. asynchronous designs. |
| Short-circuit hiccup mode | Auto-retries after fault clearance (VFB > 0.42V); avoids thermal runaway during sustained overload or output shorts. |
| UVLO with 0.1V hysteresis | Prevents brown-out oscillation during battery discharge; releases at ~2.5V after dropping below 2.4V threshold. |
Applications
| Portable Notebook Power Rails | Set-Top Box Core Logic Supply |
|---|---|
|
Use Scenario: Regulating 5V USB input to 1.8V core voltage for SoC and memory in ultra-thin notebooks. IC Role / Device Role / Timing Role: Primary synchronous buck regulator delivering stable 1A load with fast transient response to CPU burst currents. Use Value: 100% duty cycle allows full 5V→5V pass-through during battery boost; 40µA IQ extends sleep-mode runtime. |
Use Scenario: Generating 3.3V from 5V main rail for HDMI PHY, tuner ICs, and flash memory in consumer STBs. IC Role / Device Role / Timing Role: Secondary buck converter with tight output tolerance (±2% ref) ensuring signal integrity in high-speed interfaces. Use Value: 1.5MHz switching avoids AM radio band interference; TSOT25 footprint fits dense STB PCBs with minimal thermal relief. |
| Li+-Powered IoT Gateways | Industrial Human-Machine Interface (HMI) |
|
Use Scenario: Stepping down single-cell Li+ (3.0–4.2V) to 1.2V for BLE/Wi-Fi SoCs in battery-operated edge gateways. IC Role / Device Role / Timing Role: High-efficiency point-of-load regulator supporting pulse-skip mode during wireless idle periods. Use Value: Pulse-skip maintains >85% efficiency at 10mA load; <1µA shutdown current prevents battery drain during firmware OTA updates. |
Use Scenario: Providing 2.5V rail for touch controller and display driver in factory-floor HMIs operating from 5V industrial bus. IC Role / Device Role / Timing Role: Robust post-regulator with OCP, OTP, and UVLO protecting against field-induced faults and cold-start conditions. Use Value: Thermal shutdown at +160°C and automatic restart at +145°C ensures uninterrupted operation in unventilated enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP2153GQZ-P | Higher 2MHz fSW, lower 20µA IQ, but only 0.8A rated output and no 100% duty cycle. | Preferred for ultra-thin wearables needing smaller inductors; unsuitable for VOUT ≥ VIN dropout cases. | Select when board area is constrained and max load ≤0.8A; verify thermal margin with θJA = 190°C/W. |
| TPS62231DRVR | 3MHz fSW, 17µA IQ, but requires external compensation and lacks hiccup-mode SCP. | Better for noise-sensitive RF sections; less robust in unattended industrial environments with frequent overloads. | Choose for EMI-critical applications where spread-spectrum option exists; add external RC if loop stability tuning needed. |
Compared with MP2153GQZ-P and TPS62231DRVR, AP3428AKTTR-G1 uniquely combines 1A rating, 100% duty cycle, hiccup-mode short-circuit protection, and zero-compensation design - making it optimal for cost-sensitive, reliability-critical, and battery-voltage-tracking applications where full input-to-output pass-through is required.
Availability
AP3428AKTTR-G1 is available at Aetrix Electronics and suitable for portable computing, consumer set-top boxes, battery-powered IoT gateways, and industrial HMI panels requiring stable component supply with RoHS/Green compliance and full traceability.
Supply support for AP3428AKTTR-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 power management, signal integrity, and protection solutions for industrial, computing, and consumer markets.
The AP3428 series belongs to Diodes' high-efficiency DC-DC converter product line, engineered specifically for space- and battery-life-constrained portable electronics requiring minimal external components and robust fault protection.
FAQ
What is the maximum achievable output voltage with AP3428AKTTR-G1?
The AP3428AKTTR-G1 supports output voltages from 0.6V up to the input voltage (VIN) due to its 100% duty-cycle operation. With a 5.5V maximum input, the highest regulated output is 5.5V - ideal for applications requiring near-input-level rails without external LDO post-regulation.
Does AP3428AKTTR-G1 require an external bootstrap capacitor?
No. The AP3428AKTTR-G1 uses a charge-pump-based gate driver for the high-side MOSFET and does not require an external bootstrap capacitor. This simplifies layout and eliminates a common failure point in buck converters relying on bootstrap diode/capacitor networks.
How does the device behave during input undervoltage conditions?
When VIN drops below 2.4V (UVLO threshold), the AP3428AKTTR-G1 disables switching, halts regulation, and draws <1µA shutdown current. It remains disabled until VIN rises above 2.5V (2.4V + 0.1V hysteresis), then restarts via internal soft-start to prevent output overshoot.
Can AP3428AKTTR-G1 drive a 1A load continuously in TSOT25 package?
Yes - the TSOT25 package supports 1A continuous output under typical PCB conditions (2-layer board, 1-in² copper pour). Thermal data shows θJA = 220°C/W; at 1A/3.3V output from 5V input (η ≈ 90%), power dissipation is ~0.37W, resulting in ~81°C junction rise above ambient - within the +125°C max operating limit.
AP3428AKTTR-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
AP3428AKTTR-G1 FAQ
1.How can I place an order for AP3428AKTTR-G1 through Aetrix?
Please submit a Request for Quotation (RFQ) for AP3428AKTTR-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 AP3428AKTTR-G1 reliable?
The price and inventory of AP3428AKTTR-G1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP3428AKTTR-G1 is usually 5 days.
3.What payment methods are accepted for AP3428AKTTR-G1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP3428AKTTR-G1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP3428AKTTR-G1?
AP3428AKTTR-G1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP3428AKTTR-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 AP3428AKTTR-G1?
For technical support, including AP3428AKTTR-G1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP3428AKTTR-G1 requirements.
6.How does Aetrix verify that AP3428AKTTR-G1 is sourced from the original manufacturer or authorized distributors?
All AP3428AKTTR-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 AP3428AKTTR-G1 meets industry standards.
7.What is the process for return or replacement of AP3428AKTTR-G1?
All AP3428AKTTR-G1 units undergo pre-shipment inspection (PSI). If there is an issue with AP3428AKTTR-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 AP3428AKTTR-G1 part is unused and in its original packaging.
Return procedure for AP3428AKTTR-G1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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