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Diodes Incorporated AP3402KTTR-G1
- Part No.:
- AP3402KTTR-G1
- Manufacturer:
- Diodes Incorporated
- Package:
- SOT-23-6 Thin, TSOT-23-6
- Datasheet:
-
AP3402KTTR-G1.pdf
- Description:
- IC REG BUCK ADJ 2A TSOT26
- Quantity:
- Payment:
- Shipping:
Inventory:2,395
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Product details
Overview
AP3402KTTR-G1 from Diodes Incorporated is a 1 MHz, 2 A synchronous step-down DC-DC buck converter with internal high- and low-side MOSFETs, 0.6 V feedback reference, and power-good indicator. It operates from 2.7 V to 5.5 V input, delivers adjustable output from 0.6 V to VIN, and supports 100% duty cycle for low-dropout operation in Li+-powered systems.
For engineers reviewing the AP3402KTTR-G1 datasheet, AP3402KTTR-G1 pinout, AP3402KTTR-G1 application, or AP3402KTTR-G1 equivalent, key selection criteria include its 90 µA no-load quiescent current, <1 µA shutdown current, integrated soft-start, and TSOT26 footprint compatibility with space-constrained point-of-load designs.
Technical Context
The AP3402 employs constant-frequency PWM control with internal slope compensation and anti-shoot-through logic to ensure stable regulation and fast transient response under dynamic loads up to 2 A. Its error amplifier compares FB voltage against a precise 0.6 V reference, enabling accurate output setting via external resistor divider.
Functional protection includes under-voltage lockout (2.4 V threshold with 0.2 V hysteresis), thermal shutdown at +160 °C with +30 °C hysteresis, short-circuit hiccup mode, and input over-voltage protection at 6.25 V. The open-drain PG pin asserts when FB is within ±20% of 0.6 V, supporting system power sequencing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 1 MHz - Enables compact LC filter design with 2.2 µH inductor and dual 22 µF output capacitors. |
| Max Output Current | 2 A - Sustained delivery without thermal derating at TA ≤ +85 °C in TSOT26 package. |
| Feedback Reference | 0.6 V ±2% - Sets output voltage via resistor divider; enables 1.8 V, 3.3 V, or 5 V generation from single-cell input. |
| Quiescent Current | 90 µA (typ) - Minimizes battery drain in always-on subsystems such as standby rails or sensor interfaces. |
| RDS(ON) (HS/LG) | 110 mΩ / 80 mΩ - Low conduction loss supports >95% peak efficiency at medium load in 5 V → 1.8 V conversion. |
| Shutdown Current | <1 µA - Ensures negligible leakage during system sleep modes, preserving battery charge over extended idle periods. |
| UVLO Threshold | 2.4 V (with 0.2 V hysteresis) - Prevents deep discharge of single Li+ cells by disabling regulator before critical voltage collapse. |
Pinout & Package
AP3402KTTR-G1 is housed in a thermally enhanced TSOT26 (6-pin thin shrink small outline transistor) package with 0.95 mm pitch, 2.9 mm × 2.8 mm body, and exposed thermal pad (not electrically connected). Pin 1 marked with dot; recommended PCB pad layout uses 0.7 mm × 1.0 mm lands with 0.95 mm center-to-center spacing.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN (Pin 1) | Enable control input | Logic-high (>1.5 V) activates regulator; logic-low (<0.4 V) disables with <1 µA supply current. |
| GND (Pin 2) | Power and signal ground reference | Common return path for internal circuitry, power switches, and feedback network; must be low-impedance. |
| LX (Pin 3) | Switch node | Connection point between internal high- and low-side MOSFET drains; drives external inductor. |
| VIN (Pin 4) | Main power input | Bias supply for control circuitry and gate drivers; accepts 2.7–5.5 V with integrated UVLO and OVP. |
| PG (Pin 5) | Open-drain power-good indicator | Pulled low if FB deviates >±20% from 0.6 V; requires external pull-up to VIN for system monitoring. |
| FB (Pin 6) | Feedback input | Senses output voltage divider ratio; internal 0.6 V reference sets regulation point with ±2% accuracy. |
Key Features
| Feature | Design Value |
|---|---|
| No external compensation required | Internal Type-II compensation eliminates need for external capacitor/resistor network, reducing BOM count and layout sensitivity. |
| 100% duty cycle operation | Enables VOUT = VIN – dropout, critical for maintaining 3.3 V rail during Li+ cell discharge from 4.2 V to 3.0 V. |
| Integrated soft-start (1.8 ms) | Controls inrush current during startup, preventing input voltage sag and output overshoot in multi-rail systems. |
| Thermal shutdown with auto-recovery | Shuts down at +160 °C junction temperature and resumes operation only after cooling to +130 °C, avoiding latch-up failure. |
| Short-circuit hiccup protection | Enters low-duty-cycle restart mode on sustained short, limiting average power dissipation and enabling self-recovery when fault clears. |
Applications
| 5V or 3.3V Point-of-Load Conversion | DDR Memory Power Supply |
|---|---|
Use Scenario: Local regulation of 3.3 V or 5 V rails from single Li+/Li-polymer battery or USB-powered host. IC Role / Device Role / Timing Role: Primary buck regulator delivering up to 2 A with tight output tolerance and fast load-step response. Use Value: Eliminates need for external compensation and discrete MOSFETs, reducing solution size by >30% versus controller-based alternatives. | Use Scenario: Dedicated VDDQ supply for DDR2/DDR3 memory modules requiring low-noise, tightly regulated 1.8 V or 1.5 V. IC Role / Device Role / Timing Role: Synchronous buck converter providing stable output with <100 mV AC ripple under 0.1 A → 2 A load transients. Use Value: 90 µA quiescent current extends battery life in portable DDR-based systems; PG signal enables memory initialization sequencing. |
| Telecom/Networking Equipment | Set-Top Box Power Management |
Use Scenario: Intermediate rail generation in small-form-factor access points, modems, or VoIP adapters powered from 5 V wall adapters. IC Role / Device Role / Timing Role: High-efficiency step-down stage converting 5 V input to 3.3 V or 2.5 V for PHY, MCU, or interface ICs. Use Value: 95% peak efficiency minimizes heat buildup in sealed enclosures; TSOT26 footprint simplifies thermal management. | Use Scenario: Powering SoC core, video processor, and HDMI interface in consumer STBs using alkaline/NiMH or Li-ion sources. IC Role / Device Role / Timing Role: Adjustable-output buck converter supporting multiple voltage domains (1.2 V, 1.8 V, 3.3 V) via resistor feedback. Use Value: Input range (2.7–5.5 V) accommodates both fresh alkaline (1.5 V × 4) and depleted Li+ cells; UVLO prevents brownout resets. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP2143DJ-LF-Z (Monolithic Power Systems) | 2 A, 1.5 MHz, 2.5–5.5 V input, 0.8 V reference, no PG pin | Lacks power-good indicator and has higher 150 µA quiescent current | Preferred where higher switching frequency allows smaller magnetics but PG signaling is not required. |
| TPS62231DRYT (Texas Instruments) | 2 A, 3.5 MHz, 2.05–6.5 V input, 0.6 V reference, 25 µA IQ | Higher frequency enables ultra-compact design but lower max input voltage margin for 5.5 V systems | Chosen when board area is constrained and input stays below 6.0 V; less suitable for 5.5 V-rated industrial inputs. |
Compared with MP2143DJ-LF-Z and TPS62231DRYT, AP3402KTTR-G1 uniquely balances 1 MHz operation, integrated PG, sub-1 µA shutdown, and 2.7–5.5 V input range-making it optimal for battery-powered equipment requiring reliable power sequencing and minimal standby loss.
Availability
AP3402KTTR-G1 is available at Aetrix Electronics and suitable for telecom infrastructure, DDR memory subsystems, and set-top box power rails requiring stable component supply, RoHS-compliant green packaging, and long-term production continuity.
Supply support for AP3402KTTR-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 consumer markets.
The AP3402 belongs to Diodes' high-efficiency synchronous buck converter product line, engineered for space-constrained, battery-sensitive applications requiring low IQ, robust protection, and simplified design-in with no external compensation.
FAQ
What is the minimum output voltage achievable with AP3402KTTR-G1?
The AP3402KTTR-G1 supports an output voltage range from 0.6 V to VIN, with the 0.6 V internal feedback reference setting the lower bound. Using a standard resistor divider, outputs as low as 0.6 V can be precisely regulated-enabling direct support for modern low-voltage processors and memory I/O rails without external amplification.
Does AP3402KTTR-G1 require external compensation components?
No. The AP3402KTTR-G1 integrates full Type-II compensation, eliminating the need for external capacitors or resistors in the feedback loop. This reduces bill-of-materials cost and PCB area while improving noise immunity and simplifying layout-particularly beneficial in high-density portable designs where routing sensitivity is critical.
How does the power-good (PG) pin function in AP3402KTTR-G1?
The PG pin is an open-drain output that pulls low when the FB voltage falls outside ±20% of the 0.6 V reference (i.e., <0.48 V or >0.72 V), indicating out-of-regulation condition. When FB is within specification, PG remains high-impedance and must be pulled up externally-typically to VIN-to signal valid output voltage to system controllers or sequencers.
What thermal protection behavior does AP3402KTTR-G1 exhibit during overload?
When junction temperature exceeds +160 °C, AP3402KTTR-G1 disables switching and shuts down all internal circuitry. It remains latched off until temperature drops to +130 °C, at which point soft-start initiates automatic recovery. This hysteresis prevents thermal cycling and ensures safe re-entry into regulation without manual reset.
AP3402KTTR-G1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- SOT-23-6 Thin, TSOT-23-6
- 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-26
AP3402KTTR-G1 FAQ
1.How can I place an order for AP3402KTTR-G1 through Aetrix?
Please submit a Request for Quotation (RFQ) for AP3402KTTR-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 AP3402KTTR-G1 reliable?
The price and inventory of AP3402KTTR-G1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP3402KTTR-G1 is usually 5 days.
3.What payment methods are accepted for AP3402KTTR-G1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP3402KTTR-G1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP3402KTTR-G1?
AP3402KTTR-G1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP3402KTTR-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 AP3402KTTR-G1?
For technical support, including AP3402KTTR-G1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP3402KTTR-G1 requirements.
6.How does Aetrix verify that AP3402KTTR-G1 is sourced from the original manufacturer or authorized distributors?
All AP3402KTTR-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 AP3402KTTR-G1 meets industry standards.
7.What is the process for return or replacement of AP3402KTTR-G1?
All AP3402KTTR-G1 units undergo pre-shipment inspection (PSI). If there is an issue with AP3402KTTR-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 AP3402KTTR-G1 part is unused and in its original packaging.
Return procedure for AP3402KTTR-G1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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