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Diodes Incorporated AP3429AKTTR-G1
- Part No.:
- AP3429AKTTR-G1
- Manufacturer:
- Diodes Incorporated
- Package:
- SOT-23-5 Thin, TSOT-23-5
- Datasheet:
-
AP3429AKTTR-G1.pdf
- Description:
- IC REG BUCK ADJ 2A TSOT25
- Quantity:
- Payment:
- Shipping:
Inventory:3,976
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Product details
Overview
AP3429AKTTR-G1 from Diodes Incorporated is a 2A synchronous step-down DC-DC buck converter in TSOT25 package, operating at 1MHz fixed frequency with input range 2.7V–5.5V and adjustable output from 0.6V to VIN. It integrates high- and low-side MOSFETs (RDS(ON) = 110 mΩ / 80 mΩ), supports 100% duty cycle, and delivers 90μA no-load quiescent current for Li+/alkaline-powered point-of-load conversion in DDR memory supplies.
For engineers reviewing the AP3429AKTTR-G1 datasheet, AP3429AKTTR-G1 pinout, AP3429AKTTR-G1 application, or AP3429AKTTR-G1 equivalent, key selection criteria include its latch-off short-circuit protection (AP3429 variant), thermal shutdown at +160°C, UVLO with 2.4V threshold and 0.2V hysteresis, and absence of external compensation requirements.
Technical Context
The AP3429AKTTR-G1 implements constant-frequency PWM control with internal 0.6V reference error amplifier, slope compensation, and anti-shoot-through logic. Its functional block includes integrated 1MHz oscillator, current-mode PWM comparator, and dual-MOSFET switching stage with synchronous rectification.
Protection architecture comprises cycle-by-cycle overcurrent detection, input UVLO (2.4V trip, 0.2V hysteresis), output OVP (120% regulation level, 40μs delay), input OVP (6.25V), and thermal shutdown (+160°C trip, +130°C recovery). The EN pin enables/disable control with 1.5V high-threshold and 0.4V low-threshold.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.7V to 5.5V - supports single Li+/Li-polymer or dual alkaline/NiMH cells without external regulators. |
| Output Current | 2A maximum - sufficient for DDR memory VDDQ or SoC core rails in compact embedded systems. |
| Switching Frequency | 1MHz - enables use of small 2.2μH inductors and 22μF ceramic output capacitors. |
| Feedback Reference Voltage | 0.6V ±2% - sets output voltage via resistor divider; enables precise 1.8V/3.3V/5V generation. |
| Quiescent Current | 90μA - minimizes battery drain in always-on subsystems while maintaining fast wake-up response. |
| Shutdown Current | <1μA - isolates input from output during deep sleep, preventing battery depletion. |
| Duty Cycle Range | 0–100% - allows dropout operation down to VOUT = VIN − IOUT × RDS(ON), critical for high-VOUT applications. |
Pinout & Package
AP3429AKTTR-G1 uses the TSOT25 (2.9mm × 2.8mm × 1.0mm) surface-mount package with exposed thermal pad. Pin 1 is EN (enable), Pin 2 is GND, Pin 3 is LX (switch node), Pin 4 is VIN (input supply), and Pin 5 is FB (feedback input).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - EN | Enable control input | Logic-high (>1.5V) activates regulator; logic-low (<0.4V) disables with <1μA shutdown current. |
| 2 - GND | Power and signal ground reference | Common return path for feedback, enable, and internal control circuits; connects to PCB thermal pad. |
| 3 - LX | Switch node | Drain connection of internal high- and low-side MOSFETs; requires low-inductance layout to minimize EMI and ringing. |
| 4 - VIN | Main power input | Bias supply for internal circuitry and high-side gate driver; must be decoupled with ≥22μF ceramic capacitor. |
| 5 - FB | Feedback input | Connects to resistor divider from VOUT; internal 0.6V reference determines output voltage: VOUT = 0.6V × (1 + R1/R2). |
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. |
| Synchronous rectification | Integrated low-side MOSFET (80 mΩ RDS(ON)) replaces Schottky diode, improving efficiency by 5–10% at medium-to-heavy loads. |
| Latch-off short-circuit protection | Shuts down both MOSFETs permanently upon VFB < 0.3V (e.g., output short); requires EN or VIN recycle to resume operation. |
| 100% duty cycle capability | Enables VOUT ≈ VIN under light load, essential for powering 3.3V or 5V rails from 3.6V Li+ batteries. |
| Ultra-low quiescent current | 90μA IQ enables >1-year battery life in always-on IoT sensors powered by coin cells or single Li+. |
Applications
| DDR Memory Power Supply | Set-Top Box Point-of-Load |
|---|---|
|
Use Scenario: Providing stable 1.2V/1.35V VDDQ rail to DDR3/DDR4 memory modules in STB mainboards. IC Role / Device Role / Timing Role: Primary synchronous buck regulator delivering up to 2A with tight load-transient response (<100µs recovery) and low output ripple. Use Value: 1MHz switching enables compact 2.2µH inductor and dual 22µF ceramic output caps, reducing board area by 35% vs. 500kHz solutions. |
Use Scenario: Generating 3.3V auxiliary supply for HDMI PHY, USB controller, and tuner ICs in consumer STBs. IC Role / Device Role / Timing Role: Secondary buck converter fed from 5V main rail, supporting dynamic load steps from standby (10mA) to active (1.8A) states. Use Value: 90μA quiescent current extends standby battery backup time; 100% duty cycle maintains 3.3V output even as 5V rail sags to 3.6V. |
| Telecom Line Card Bias | Video Card GPU Core Auxiliary |
|
Use Scenario: Delivering 1.8V bias to Ethernet PHY transceivers and PoE interface controllers on telecom line cards. IC Role / Device Role / Timing Role: Isolated point-of-load regulator with latch-off SCP to prevent cascading failure during field-induced shorts. Use Value: Input UVLO (2.4V) prevents brownout operation during hot-swap events; thermal shutdown (+160°C) protects against airflow-blocked enclosures. |
Use Scenario: Supplying 1.05V–1.2V GPU memory interface voltage in compact PCIe video cards with limited thermal headroom. IC Role / Device Role / Timing Role: High-efficiency synchronous buck converter placed adjacent to GDDR6 memory stacks, minimizing IR drop. Use Value: Integrated 110/80 mΩ MOSFETs achieve >92% peak efficiency at 1.8V/2A, reducing localized heating versus discrete FET solutions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP2143GJ-Z (Monolithic Power) | 2A, 1MHz, 2.5–5.5V input, 0.8V ref, requires external compensation, 120μA IQ | Lacks 100% duty cycle; no latch-off SCP; higher IQ increases battery drain | Prefer when design allows external compensation and thermal margin exceeds 15°C |
| RT7290AZSP (Richtek) | 2A, 1.5MHz, 2.7–5.5V input, 0.6V ref, no external compensation, 85μA IQ, hiccup SCP | Hiccup mode (not latch-off); 1.5MHz limits inductor size further but increases switching loss | Select for faster transient response where short-circuit recovery must be autonomous |
Compared with MP2143GJ-Z and RT7290AZSP, AP3429AKTTR-G1 uniquely combines latch-off SCP for safety-critical systems, 100% duty cycle for Li+-fed rails, and industry-leading 90μA IQ-making it optimal for battery-backed DDR supplies and telecom edge devices requiring fail-safe shutdown.
Availability
AP3429AKTTR-G1 is available at Aetrix Electronics and suitable for DDR memory power supplies, set-top box point-of-load conversion, telecom line card biasing, and video card GPU auxiliary rails requiring stable component supply across industrial temperature ranges (−40°C to +85°C).
Supply support for AP3429AKTTR-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 AP3429 series belongs to Diodes' high-efficiency DC-DC converter product line, designed specifically for space-constrained, battery-sensitive applications requiring robust protection and minimal external components.
FAQ
What is the maximum achievable output voltage with AP3429AKTTR-G1?
The AP3429AKTTR-G1 supports output voltages from 0.6V up to the input voltage (VIN), enabled by its 100% duty cycle operation. When VIN = 5.5V, VOUT can be set to 5.5V using a direct connection from FB to GND (no resistor divider), making it suitable for applications like Li+ battery pass-through or 5V rail generation from a 5.5V source.
Does AP3429AKTTR-G1 require an external bootstrap capacitor?
No. The AP3429AKTTR-G1 does not require an external bootstrap capacitor because its high-side gate driver is powered directly from the VIN pin and uses internal charge-pump circuitry to sustain gate voltage during 100% duty cycle operation-eliminating the need for external boot components and simplifying layout.
How does the latch-off short-circuit protection behave during fault conditions?
When output short-circuit causes FB voltage to drop below 0.3V, the AP3429AKTTR-G1 immediately disables both internal MOSFETs and enters latch-off state. Output remains off until either the EN pin is cycled low-then-high or VIN is power-cycled-ensuring system-level fault containment without automatic retry that could stress downstream components.
Can AP3429AKTTR-G1 operate with ceramic output capacitors only?
Yes. The AP3429AKTTR-G1 is optimized for ceramic output capacitors (e.g., dual 22μF X5R/X7R) due to its internal Type-II compensation and stable phase margin across 10μF–100μF ranges. No electrolytic or tantalum capacitors are needed, enabling smaller footprint, longer lifetime, and lower ESR-related losses.
AP3429AKTTR-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):
- 2.7V
- 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
AP3429AKTTR-G1 FAQ
1.How can I place an order for AP3429AKTTR-G1 through Aetrix?
Please submit a Request for Quotation (RFQ) for AP3429AKTTR-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 AP3429AKTTR-G1 reliable?
The price and inventory of AP3429AKTTR-G1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP3429AKTTR-G1 is usually 5 days.
3.What payment methods are accepted for AP3429AKTTR-G1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP3429AKTTR-G1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP3429AKTTR-G1?
AP3429AKTTR-G1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP3429AKTTR-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 AP3429AKTTR-G1?
For technical support, including AP3429AKTTR-G1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP3429AKTTR-G1 requirements.
6.How does Aetrix verify that AP3429AKTTR-G1 is sourced from the original manufacturer or authorized distributors?
All AP3429AKTTR-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 AP3429AKTTR-G1 meets industry standards.
7.What is the process for return or replacement of AP3429AKTTR-G1?
All AP3429AKTTR-G1 units undergo pre-shipment inspection (PSI). If there is an issue with AP3429AKTTR-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 AP3429AKTTR-G1 part is unused and in its original packaging.
Return procedure for AP3429AKTTR-G1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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