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Diodes Incorporated AP3429KTTR-G1
- Part No.:
- AP3429KTTR-G1
- Manufacturer:
- Diodes Incorporated
- Package:
- SOT-23-5 Thin, TSOT-23-5
- Datasheet:
-
AP3429KTTR-G1.pdf
- Description:
- IC REG BUCK ADJ 2A TSOT25
- Quantity:
- Payment:
- Shipping:
Inventory:4,992
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Product details
Overview
AP3429KTTR-G1 from Diodes Incorporated is a 2A synchronous step-down DC-DC buck converter with 1MHz fixed-frequency PWM control, internal 110mΩ/80mΩ MOSFETs, 0.6V to VIN adjustable output, and 2.7V–5.5V input range. It delivers high efficiency in space-constrained point-of-load applications such as DDR memory power supplies and video card core rails.
For engineers reviewing the AP3429KTTR-G1 datasheet, AP3429KTTR-G1 pinout, AP3429KTTR-G1 application, or AP3429KTTR-G1 equivalent, key selection criteria include its 100% duty cycle capability for low-dropout operation, <1μA shutdown current, no external compensation requirement, and latch-off short-circuit protection specific to the AP3429 variant.
Technical Context
The AP3429KTTR-G1 implements a current-mode PWM architecture with integrated slope compensation and anti-shoot-through logic to ensure stable switching across load transients. Its 0.6V reference voltage feeds an error amplifier that regulates output via the FB pin, while the EN pin provides precise enable/disable control with 1.5V high-threshold and 0.4V low-threshold.
Protection functions are hardware-based and autonomous: UVLO triggers at 2.4V with 0.2V hysteresis; over-temperature shutdown activates at +160°C with +30°C hysteresis; and short-circuit protection forces latch-off when FB drops below 0.3V - a behavior distinguishing AP3429 from the hiccup-mode AP3429A.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 2A maximum continuous - supports DDR memory and video card core loads without external current boosting. |
| Switching Frequency | 1MHz fixed - enables compact 2.2µH inductor and reduces EMI filtering burden in dense PCB layouts. |
| RDS(ON) (HS/LG) | 110mΩ / 80mΩ - minimizes conduction loss and thermal rise at full load in TSOT25 package. |
| Feedback Reference | 0.6V ±2% - sets output voltage via resistor divider; enables 0.6V–VIN adjustment with tight regulation. |
| Quiescent Current | 90μA - sustains battery-powered operation during light-load sleep modes without compromising startup time. |
| Shutdown Current | <1μA - isolates input from output and preserves single-cell Li+ or alkaline battery life during system standby. |
| Duty Cycle Range | 0–100% - supports dropout operation down to VOUT = VIN, critical for high-VOUT/low-VIN scenarios. |
Pinout & Package
AP3429KTTR-G1 is housed in a 5-pin TSOT25 (2.9mm × 2.8mm × 0.9mm) thermally enhanced lead-free package with exposed pad for improved heat dissipation. The package complies with RoHS, halogen-free, and antimony-free "Green" requirements.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 EN | Enable control input | Logic-level interface: >1.5V enables regulation; <0.4V forces shutdown with sub-μA quiescent draw. |
| 2 GND | Power and signal ground reference | Common return path for IC bias, feedback, and power switch sources; must be low-impedance. |
| 3 LX | Switch node | Connection point between internal high-side and low-side MOSFET drains; requires careful layout to minimize ringing. |
| 4 VIN | Main power supply input | Accepts 2.7–5.5V; powers internal circuitry and high-side gate driver; bypassed with 22μF ceramic capacitor. |
| 5 FB | Feedback input to error amplifier | Senses output voltage divider; regulated to 0.6V; determines VOUT = 0.6V × (1 + R1/R2). |
Key Features
| Feature | Design Value |
|---|---|
| No external compensation required | Internal Type-II compensation eliminates loop-stability tuning effort and saves board area. |
| 100% duty cycle operation | Enables VOUT = VIN mode - essential for low-dropout conversion in battery-fed systems near end-of-discharge. |
| Latch-off short-circuit protection | Halts switching permanently upon FB < 0.3V (e.g., output short); requires EN/VIN recycle to resume - prevents thermal runaway. |
| Integrated soft-start | 1.8ms internal ramp limits inrush current and prevents output overshoot during power-up. |
| Thermal shutdown with hysteresis | Shuts down at +160°C junction; auto-restarts at +130°C - avoids oscillatory tripping during sustained moderate overload. |
Applications
| DDR Memory Power Supply | Video Card Core Rail |
|---|---|
|
Use Scenario: Supplies 1.2V/1.35V to DDR3/DDR4 memory modules on graphics cards and motherboards. IC Role / Device Role / Timing Role: Primary synchronous buck regulator delivering tightly regulated, low-noise VDDQ with fast transient response. Use Value: 2A output current and 1MHz switching support compact 2.2µH inductors while maintaining <±2% output accuracy under dynamic load steps. |
Use Scenario: Powers GPU core voltage domain in embedded and consumer video cards operating from 5V or 3.3V rails. IC Role / Device Role / Timing Role: High-efficiency point-of-load converter with 100% duty cycle enabling direct 5V→4.5V conversion during GPU boost states. Use Value: Ultra-low RDS(ON) MOSFETs and 90μA quiescent current reduce thermal load and extend battery runtime in portable GPU platforms. |
| Set-Top Box SoC Core | Telecom Line Card Bias |
|
Use Scenario: Generates 1.0V–1.8V core voltage for ARM-based SoCs in cable/satellite set-top boxes with strict standby power budgets. IC Role / Device Role / Timing Role: Main SoC power rail regulator with enable-controlled deep-sleep mode and UVLO protection against brownout. Use Value: <1μA shutdown current and 2.4V UVLO threshold prevent deep discharge of backup coin cells used for real-time clock retention. |
Use Scenario: Provides isolated 3.3V bias for Ethernet PHYs and management controllers on telecom line cards powered from 48V backplane. IC Role / Device Role / Timing Role: Secondary buck stage stepping down intermediate 5V rail to clean, low-noise 3.3V for sensitive analog interfaces. Use Value: Fixed 1MHz frequency simplifies EMI filter design; internal soft-start prevents inrush-induced reset of adjacent management ICs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AP3429AKTTR-G1 | Replaces latch-off SCP with hiccup-mode recovery; removes OVP latch-off; same pinout and electrical specs otherwise. | Preferred where automatic fault recovery is required (e.g., unattended telecom equipment), not where safety-critical lockout is mandated. | Select AP3429AKTTR-G1 if system firmware can handle intermittent faults; retain AP3429KTTR-G1 for deterministic shutdown in safety-aware designs. |
| MP2143DJ-LF-Z | 2A, 2.5–6V input, 1.2MHz, but requires external compensation and lacks 100% duty cycle; different pinout (8-pin QFN). | Used in industrial PLC I/O modules where layout flexibility outweighs footprint constraints and duty-cycle needs. | Choose MP2143 only when board redesign accommodates larger package and compensation network; AP3429KTTR-G1 offers faster time-to-market with minimal BOM. |
Compared with AP3429AKTTR-G1, the AP3429KTTR-G1 provides deterministic latch-off during output shorts - critical for systems requiring fail-safe isolation. Versus MP2143DJ-LF-Z, it eliminates compensation components and enables lower-VOUT operation near VIN, reducing bill-of-materials and improving battery utilization.
Availability
AP3429KTTR-G1 is available at Aetrix Electronics and suitable for DDR memory power supplies, video card core rails, and set-top box SoC core regulation requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.
Supply support for AP3429KTTR-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-performance power management, signal integrity, and protection solutions for industrial, computing, and communications markets.
The AP3429 series belongs to Diodes' high-efficiency synchronous buck converter product line, designed specifically for compact, low-voltage point-of-load applications demanding minimal external components and robust protection in battery- and adapter-powered systems.
FAQ
What is the function of the LX pin on AP3429KTTR-G1?
The LX pin is the switch node connecting the drains of the internal high-side and low-side MOSFETs. It carries pulsed high-current waveforms during switching and must be routed with minimal loop area and adequate copper pour for thermal and EMI performance. It interfaces directly with the inductor and output capacitor in the buck topology.
Does AP3429KTTR-G1 require external compensation components?
No. The AP3429KTTR-G1 integrates Type-II compensation circuitry, eliminating the need for external resistors or capacitors in the feedback loop. This simplifies design, reduces PCB footprint, and ensures stable operation across all supported input/output conditions without tuning.
How does short-circuit protection operate on AP3429KTTR-G1?
When the FB voltage falls below 0.3V - indicating an output short or severe overload - the AP3429KTTR-G1 enters latch-off mode: both internal MOSFETs turn off and remain disabled until EN is cycled low-high or VIN is power-cycled. This prevents thermal damage and ensures safe fault containment.
What is the significance of 100% duty cycle operation in AP3429KTTR-G1?
100% duty cycle allows the output voltage to equal the input voltage (VOUT = VIN) with no dropout loss. This is critical for battery-powered systems nearing end-of-life, enabling continued operation even as input voltage declines - for example, sustaining 4.2V output from a 4.2V Li+ cell without regulation collapse.
AP3429KTTR-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:
- Not For New Designs
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2.7V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 0.6V
- Voltage - Output (Max):
- 5.5V
- Current - Output:
- 2A
- Frequency - Switching:
- 1MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TSOT-25
AP3429KTTR-G1 FAQ
1.How can I place an order for AP3429KTTR-G1 through Aetrix?
Please submit a Request for Quotation (RFQ) for AP3429KTTR-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 AP3429KTTR-G1 reliable?
The price and inventory of AP3429KTTR-G1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP3429KTTR-G1 is usually 5 days.
3.What payment methods are accepted for AP3429KTTR-G1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP3429KTTR-G1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP3429KTTR-G1?
AP3429KTTR-G1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP3429KTTR-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 AP3429KTTR-G1?
For technical support, including AP3429KTTR-G1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP3429KTTR-G1 requirements.
6.How does Aetrix verify that AP3429KTTR-G1 is sourced from the original manufacturer or authorized distributors?
All AP3429KTTR-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 AP3429KTTR-G1 meets industry standards.
7.What is the process for return or replacement of AP3429KTTR-G1?
All AP3429KTTR-G1 units undergo pre-shipment inspection (PSI). If there is an issue with AP3429KTTR-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 AP3429KTTR-G1 part is unused and in its original packaging.
Return procedure for AP3429KTTR-G1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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