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Diodes Incorporated AP3406K-ADJTRG1
- Part No.:
- AP3406K-ADJTRG1
- Manufacturer:
- Diodes Incorporated
- Package:
- SC-74A, SOT-753
- Datasheet:
-
AP3406K-ADJTRG1.pdf
- Description:
- IC REG BUCK ADJ 650MA SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,195
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Product details
Overview
AP3406K-ADJTRG1 from BCD Semiconductor is a 1.1MHz current-mode synchronous buck DC-DC converter in SOT-23-5 package, delivering up to 650mA output with input range 2.5V–5.5V and adjustable output via FB pin. It integrates high-side PFET (0.44Ω) and low-side NFET (0.29Ω), supports 100% duty cycle in dropout, and features thermal shutdown, short-circuit protection, and <1μA shutdown current. Ideal for Li-ion-powered portable media players and digital cameras.
For engineers reviewing the AP3406K-ADJTRG1 datasheet, AP3406K-ADJTRG1 pinout, AP3406K-ADJTRG1 application, or AP3406K-ADJTRG1 equivalent, key selection criteria include adjustable output voltage capability, integrated synchronous switches eliminating external Schottky diodes, 1.1MHz fixed-frequency operation enabling compact filter design, and robust protection features for battery-constrained systems.
Technical Context
The AP3406K-ADJTRG1 employs peak-current-mode control with internal slope compensation and a 0.6V reference error amplifier. Its EN pin enables precise enable/disable sequencing with 0.6V/1.5V thresholds, and the FB pin accepts external resistor dividers to set output voltage across the full 0.6V × (1 + R1/R2) range.
It operates in continuous conduction mode (CCM) at light-to-moderate loads and transitions to discontinuous conduction mode (DCM) under very light loads. The built-in soft-start (220μs) limits inrush current, while thermal shutdown triggers at 160°C with 30°C hysteresis to ensure safe recovery.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 1.1MHz ±30% - Enables use of small 2.2–10μH inductors and ceramic output capacitors for space-constrained portable designs. |
| Max Output Current | 650mA - Sustained load capability at VOUT ≥ 0.9V with VIN ≥ 2.5V, verified across -40°C to 85°C ambient. |
| Input Voltage Range | 2.5V to 5.5V - Matches single-cell Li-ion (2.7–4.2V) and USB-powered (5V) systems without external regulation. |
| Feedback Reference | 0.600V ±2% - Sets output voltage accuracy; allows adjustable outputs from ~0.6V to >5V using standard resistor ratios. |
| Shutdown Current | <1μA - Minimizes battery drain during system sleep, critical for GPS and camera standby modes. |
| Thermal Shutdown | 160°C ±5°C - Protects IC under sustained overload or poor PCB thermal layout; 30°C hysteresis prevents oscillation. |
| EN Threshold | 0.6V (low) / 1.5V (high) - Compatible with standard GPIO logic levels and enables clean power sequencing with external pull-up/down. |
Pinout & Package
The AP3406K-ADJTRG1 is housed in a RoHS-compliant SOT-23-5 package (2.9mm × 1.6mm × 1.1mm), optimized for thermal dissipation (θJA = 265°C/W) and reflow compatibility.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - EN | Enable control input | Active-high logic input; <0.6V disables regulator and reduces ICC to <1μA; >1.5V enables PWM operation. |
| 2 - GND | Power ground reference | Common return path for internal switches, error amplifier, and feedback network; must be low-impedance PCB plane. |
| 3 - SW | Switch node | Drain connection of internal PFET/NFET; connects directly to inductor; requires tight layout to minimize EMI and ringing. |
| 4 - VIN | Input power supply | Accepts 2.5–5.5V; requires ≥4.7μF ceramic bypass capacitor placed adjacent to pin for stable switching operation. |
| 5 - FB | Output voltage feedback | Connects to resistor divider from VOUT; regulates output by comparing divider voltage to 0.6V internal reference. |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous rectification | Integrated 0.44Ω PFET and 0.29Ω NFET eliminate external Schottky diode, improving efficiency by 5–10% over asynchronous designs. |
| 100% duty-cycle operation | Enables VOUT ≈ VIN − IOUT×RDSONP under dropout, extending runtime in deep battery discharge (e.g., Li-ion <3.0V). |
| Current-limit protection | Internal 0.8–1.15A switch current limit prevents damage during output short or overload, independent of FB loop response. |
| Soft-start timing | Fixed 220μs internal soft-start ramps output voltage linearly, preventing input rail collapse and inrush stress on input capacitors. |
Applications
| GPS Receivers | WiFi Cards |
|---|---|
Use Scenario: Powering GNSS baseband processors and RF front-ends in handheld navigation devices with single-cell Li-ion batteries. IC Role / Device Role / Timing Role: Primary step-down regulator generating 1.8V or 3.3V from 3.0–4.2V battery, supporting fast transient response during signal acquisition bursts. Use Value: 95% peak efficiency and <1μA shutdown current extend battery life between location fixes; 1.1MHz switching avoids interference with GPS L1 band (1.575GHz). | Use Scenario: Supplying regulated 3.3V to IEEE 802.11b/g/n transceivers and MAC controllers in mini-PCIe or M.2 WiFi modules. IC Role / Device Role / Timing Role: Main power rail converter with fast load-step response (<100μs settling per Figure 10) to handle TX/RX current surges up to 500mA. Use Value: Integrated current-mode control ensures stable regulation across wide input variation (USB 5V or battery 3.6V); thermal shutdown protects during enclosure overheating. |
| Portable Media Players | Digital Still Cameras |
Use Scenario: Delivering 1.2V core voltage to ARM-based application processors and 3.3V to SD card interfaces in flash-based audio/video players. IC Role / Device Role / Timing Role: Dual-rail support via separate AP3406K-ADJTRG1 instances; FB-adjustable outputs match SoC VDD requirements. Use Value: Compact SOT-23-5 footprint saves board area; 220μs soft-start prevents audio pop during power-on; 650mA capacity covers burst decode loads. | Use Scenario: Powering CMOS image sensors, ISP processors, and LCD bias circuits in compact point-and-shoot cameras. IC Role / Device Role / Timing Role: High-efficiency buck regulator supplying 2.8V sensor analog rail and 1.8V digital core, with tight output voltage tolerance (±2%). Use Value: 0.6V feedback reference enables accurate low-voltage outputs; short-circuit protection (Figure 12) safeguards against sensor cable faults during lens actuation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP2101DJ-LF-Z | Fixed 1.5MHz frequency; 600mA max output; no 100% duty cycle; higher quiescent current (25μA) | Lacks dropout support below 0.9V; less suitable for deep-discharge Li-ion operation | Preferred where higher switching frequency justifies smaller inductors and tighter EMI filtering is required. |
| TPS62231DRYR | 1.8–6.0V input; 600mA; DCS-Control™ topology; 17μA IQ; 0.6V reference | Superior light-load efficiency via pulse-frequency modulation; no integrated current limit reporting | Chosen when ultra-low IQ and seamless transition between PWM/PFM are mandatory for always-on sensor nodes. |
Compared with MP2101DJ-LF-Z and TPS62231DRYR, the AP3406K-ADJTRG1 offers unique 100% duty-cycle operation and lower shutdown current (<1μA), making it optimal for cost-sensitive, battery-life-critical portable systems where input voltage may fall near output voltage.
Availability
AP3406K-ADJTRG1 is available at Aetrix Electronics and suitable for GPS receivers, WiFi cards, and portable media players requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for AP3406K-ADJTRG1 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
BCD Semiconductor Manufacturing Limited is a Shanghai-based analog and power IC designer specializing in high-performance, cost-optimized semiconductor solutions for consumer, industrial, and computing markets.
The AP3406 product line targets portable power management, emphasizing integration (synchronous FETs, protection, soft-start), small-footprint packaging (SOT-23-5/TSOT-23-5), and battery-friendly features like ultra-low shutdown current and dropout operation.
FAQ
What output voltage range can be set using the FB pin?
The AP3406K-ADJTRG1 uses a 0.600V ±2% internal reference. With an external resistor divider (R1 from VOUT to FB, R2 from FB to GND), output voltage is calculated as VOUT = 0.6V × (1 + R1/R2). Practical range spans ~0.6V to 5.5V, limited only by component ratings and stability constraints. Typical configurations yield 1.2V, 1.8V, 2.5V, 3.3V, or 5.0V outputs.
Does the AP3406K-ADJTRG1 require an external Schottky diode?
No. The AP3406K-ADJTRG1 integrates both high-side PFET and low-side NFET switches, enabling fully synchronous rectification. This eliminates the need for an external Schottky diode, reducing component count, board area, and conduction losses-key for achieving up to 95% peak efficiency in portable applications.
How does the EN pin behave during power sequencing?
The EN pin has precise thresholds: device enables when voltage rises above 1.5V and shuts down when voltage falls below 0.6V. Input leakage is ±0.1μA, allowing direct connection to microcontroller GPIOs or RC delay networks. During shutdown, total supply current drops below 1μA, and SW pin is high-impedance-preventing backfeed into the inductor.
What thermal derating applies at 85°C ambient?
With θJA = 265°C/W and maximum junction temperature TJ = 125°C, the allowable power dissipation at TA = 85°C is (125 − 85)/265 ≈ 151mW. At 650mA output and 3.6V input, typical losses are ~120mW (based on 92% efficiency), so full 650mA load remains viable at 85°C ambient with minimal PCB copper area (≥1 cm² 2oz copper pour under GND pad).
AP3406K-ADJTRG1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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:
- 650mA
- Frequency - Switching:
- 1.1MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
AP3406K-ADJTRG1 FAQ
1.How can I place an order for AP3406K-ADJTRG1 through Aetrix?
Please submit a Request for Quotation (RFQ) for AP3406K-ADJTRG1 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 AP3406K-ADJTRG1 reliable?
The price and inventory of AP3406K-ADJTRG1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP3406K-ADJTRG1 is usually 5 days.
3.What payment methods are accepted for AP3406K-ADJTRG1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP3406K-ADJTRG1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP3406K-ADJTRG1?
AP3406K-ADJTRG1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP3406K-ADJTRG1 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 AP3406K-ADJTRG1?
For technical support, including AP3406K-ADJTRG1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP3406K-ADJTRG1 requirements.
6.How does Aetrix verify that AP3406K-ADJTRG1 is sourced from the original manufacturer or authorized distributors?
All AP3406K-ADJTRG1 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 AP3406K-ADJTRG1 meets industry standards.
7.What is the process for return or replacement of AP3406K-ADJTRG1?
All AP3406K-ADJTRG1 units undergo pre-shipment inspection (PSI). If there is an issue with AP3406K-ADJTRG1, 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 AP3406K-ADJTRG1 part is unused and in its original packaging.
Return procedure for AP3406K-ADJTRG1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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