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Diodes Incorporated AP3428DNTR-G1
- Part No.:
- AP3428DNTR-G1
- Manufacturer:
- Diodes Incorporated
- Package:
- 6-UDFN Exposed Pad
- Datasheet:
-
AP3428DNTR-G1.pdf
- Description:
- IC REG BUCK ADJ 1A UDFN20206
- Quantity:
- Payment:
- Shipping:
Inventory:71,639
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Product details
Overview
AP3428DNTR-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 or multi-cell alkaline/NiMH-powered portable electronics requiring compact, high-efficiency regulation.
For engineers reviewing the AP3428DNTR-G1 datasheet, AP3428DNTR-G1 pinout, AP3428DNTR-G1 application, or AP3428DNTR-G1 equivalent, this page delivers verified technical context, package-specific pin mapping, real-world application constraints, and validated alternative options for battery-powered embedded systems where input range (2.5–5.5V), light-load efficiency (pulse-skip mode), and thermal robustness (+160°C OTP) are critical selection criteria.
Technical Context
The AP3428DNTR-G1 implements a constant-frequency PWM control architecture with integrated error amplifier, slope compensation, and cycle-by-cycle current limiting. Its synchronous rectification eliminates external diode losses, while internal soft-start (2ms) and undervoltage lockout (2.4V threshold, 0.1V hysteresis) ensure controlled power-up and battery protection.
It features dual overcurrent protection modes: hiccup-mode short-circuit response when FB < 0.42V, and cycle-by-cycle peak current limit at 1.3A. Thermal shutdown activates at +160°C with +15°C hysteresis, enabling automatic recovery at +145°C - critical for sustained 1A operation in confined PCB layouts.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 1.5MHz fixed - enables use of small 2.2µH inductors and 10µF output capacitors for space-constrained designs. |
| Input Voltage Range | 2.5V to 5.5V - supports single Li+/Li-polymer cell (3.0–4.2V), two alkaline/NiMH cells (2.4–3.2V), or USB-powered systems. |
| Output Voltage Range | 0.6V to VIN - adjustable via external resistor divider; 0.6V ±2% reference ensures ±30mV accuracy at 1.8V output. |
| Max Output Current | 1A continuous - sustained under thermal limits in U-DFN2020-6 package (θJA = 53°C/W). |
| Quiescent Current | 40µA typical - minimizes standby power loss in always-on subsystems like RTC or sensor monitoring. |
| Shutdown Current | <1µA - isolates input from output during deep sleep, preventing battery drain in portable devices. |
| RDS(ON) (HS/LG) | 250 mΩ / 170 mΩ - reduces conduction loss at full load, supporting >90% efficiency at 5V→3.3V/1A. |
Pinout & Package
AP3428DNTR-G1 is packaged in U-DFN2020-6 (Type J), a 2.0mm × 2.0mm, 0.65mm pitch, moisture-sensitivity Level 1 package with NiPdAu-plated terminals. Its compact footprint and low thermal resistance (θJA = 53°C/W) support high-power density designs on thin PCBs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (NC) | No-connect terminal | Internally unconnected; must be left floating or tied to GND per layout guidelines - no electrical function. |
| 2 (GND) | Power ground reference | Primary return path for switching current and IC bias; requires low-inductance connection to power plane. |
| 3 (LX) | Switch node | Drain connection of internal high- and low-side MOSFETs; carries high dv/dt switching waveform - demands tight loop area with inductor and input cap. |
| 4 (VIN) | Main power supply input | Bias rail for internal circuitry and gate drivers; requires local 10µF ceramic capacitor placed within 2mm of pin. |
| 5 (FB) | Feedback input | Senses output voltage via resistor divider; 0.6V threshold sets VOUT = 0.6V × (1 + R1/R2); leakage <0.2µA preserves accuracy. |
| 6 (EN) | Enable control | Logic-level input: ≥1.5V enables regulation; ≤0.4V forces shutdown with <1µA current draw - compatible with GPIOs or battery monitors. |
Key Features
| Feature | Design Value |
|---|---|
| Internal synchronous MOSFETs | Eliminates external Schottky diode, reducing BOM count and board area while improving efficiency by ~8% vs. asynchronous designs. |
| Pulse-skip light-load mode | Maintains >85% efficiency at 10mA load - extends battery runtime in intermittently active applications like remote controls or wearables. |
| No external compensation required | Stable operation across all input/output combinations without loop compensation components - simplifies design validation and reduces layout sensitivity. |
| 100% duty-cycle operation | Supports VOUT = VIN - enables low-dropout regulation near battery end-of-life (e.g., 3.0V→2.9V at 1A). |
| Integrated thermal shutdown | Auto-recovery at +145°C after +160°C trip - prevents permanent damage during transient overload or poor heatsinking without manual reset. |
Applications
| Portable Medical Sensors | Notebook Subsystem Regulation |
|---|---|
|
Use Scenario: Powering ultra-low-power glucose monitors or pulse oximeters powered by coin-cell or single Li-ion batteries. IC Role / Device Role / Timing Role: Primary buck regulator delivering stable 1.8V/3.3V to MCU, BLE radio, and analog front-end from 2.5–4.2V varying input. Use Value: 40µA quiescent current extends battery life beyond 6 months; 100% duty cycle maintains output as battery discharges to 2.5V. |
Use Scenario: Point-of-load regulation for DDR memory termination or USB-C PD auxiliary rails in thin-and-light notebooks. IC Role / Device Role / Timing Role: Secondary buck converter stepping 5V USB-C bus down to 1.2V/1.5V with fast transient response to memory access bursts. Use Value: 1.5MHz switching enables small 1.0mm-height inductors; pulse-skip mode cuts idle power during display sleep states. |
| Smart Home Hubs | Industrial Handheld Terminals |
|
Use Scenario: Regulating power for Zigbee/Z-Wave SoCs and RF front-ends in battery-backed smart home gateways. IC Role / Device Role / Timing Role: Always-on 3.3V rail generator with EN pin controlled by MCU to disable peripherals during network idle periods. Use Value: <1µA shutdown current prevents battery depletion during weeks-long standby; hiccup-mode SCP protects against antenna fault conditions. |
Use Scenario: Power management for ruggedized barcode scanners or RFID readers operating from 3.6V Li-ion packs in warehouse environments. IC Role / Device Role / Timing Role: Main system regulator supplying 1A to ARM Cortex-M7 MCU, display driver, and motor interface under wide temperature (-40°C to +85°C). Use Value: +160°C thermal shutdown prevents latch-up during hot ambient operation; TSOT25/U-DFN2020-6 package options support both cost- and size-optimized variants. |
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 | 1.5MHz, 1A, 2.5–5.5V input, but uses external compensation and lacks 100% duty cycle. | Requires additional RC network for stability; cannot regulate down to VIN - unsuitable for deep battery discharge scenarios. | Select when loop tuning flexibility is needed and input voltage remains ≥3.0V. |
| TPS62240DRVR | 1.8MHz, 0.6A max, 2.0–6.0V input, 2.5µA quiescent current, but no hiccup-mode SCP. | Lower current rating limits use to sub-600mA loads; absence of hiccup protection increases risk during output shorts. | Select only for ultra-low-IQ applications where peak current ≤0.6A and short-circuit exposure is mitigated externally. |
Compared with MP2158GQZ-P and TPS62240DRVR, AP3428DNTR-G1 uniquely combines 1A capability, 100% duty cycle, hiccup-mode short-circuit protection, and zero-compensation design - making it optimal for space-constrained, battery-critical systems needing robust, plug-and-play regulation without loop tuning.
Availability
AP3428DNTR-G1 is available at Aetrix Electronics and suitable for portable medical sensors, notebook subsystem regulation, smart home hubs, and industrial handheld terminals requiring stable component supply, long-term lifecycle support, and RoHS/Green compliance.
Supply support for AP3428DNTR-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 semiconductor manufacturer specializing in discrete, analog, and mixed-signal solutions for power management, signal integrity, and connectivity applications.
The AP3428 series belongs to Diodes' high-efficiency DC-DC converter product line, engineered specifically for compact, battery-powered consumer and industrial electronics demanding low quiescent current, wide input range, and robust protection features.
FAQ
What is the recommended input capacitor for AP3428DNTR-G1?
A 10µF X5R/X7R ceramic capacitor placed within 2mm of the VIN and GND pins is specified in the datasheet. This value ensures sufficient charge reservoir for 1.5MHz switching transients and stabilizes the input rail during load steps. Use low-ESR types rated for ≥6.3V; parallel with a 100nF capacitor if high-frequency noise suppression is required.
Can AP3428DNTR-G1 operate with an output voltage equal to the input voltage?
Yes - AP3428DNTR-G1 supports 100% duty-cycle operation, allowing VOUT to track VIN down to the minimum 0.6V reference. This is confirmed in the Electrical Characteristics table and Application Information section, enabling regulation during battery brownout conditions where VIN drops to 2.5V and VOUT must remain at 2.5V.
How does the short-circuit protection behave during sustained fault conditions?
When FB falls below 0.42V due to output shorting, AP3428DNTR-G1 enters hiccup mode: it disables switching, waits ~30ms, then attempts restart. If the short persists, it repeats the cycle - limiting average power dissipation and junction temperature rise. Recovery occurs automatically once FB rises above 0.42V after fault removal.
Is AP3428DNTR-G1 qualified for automotive applications?
No - AP3428DNTR-G1 is not AEC-Q100 qualified. The datasheet explicitly states that automotive-grade versions require separate qualification and PPAP capability, and directs users to contact Diodes for such parts. This device is intended for commercial/industrial portable electronics with -40°C to +85°C ambient operation.
AP3428DNTR-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):
- 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:
- U-DFN2020-6 (Type J)
AP3428DNTR-G1 FAQ
1.How can I place an order for AP3428DNTR-G1 through Aetrix?
Please submit a Request for Quotation (RFQ) for AP3428DNTR-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 AP3428DNTR-G1 reliable?
The price and inventory of AP3428DNTR-G1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP3428DNTR-G1 is usually 5 days.
3.What payment methods are accepted for AP3428DNTR-G1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP3428DNTR-G1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP3428DNTR-G1?
AP3428DNTR-G1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP3428DNTR-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 AP3428DNTR-G1?
For technical support, including AP3428DNTR-G1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP3428DNTR-G1 requirements.
6.How does Aetrix verify that AP3428DNTR-G1 is sourced from the original manufacturer or authorized distributors?
All AP3428DNTR-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 AP3428DNTR-G1 meets industry standards.
7.What is the process for return or replacement of AP3428DNTR-G1?
All AP3428DNTR-G1 units undergo pre-shipment inspection (PSI). If there is an issue with AP3428DNTR-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 AP3428DNTR-G1 part is unused and in its original packaging.
Return procedure for AP3428DNTR-G1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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