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Diodes Incorporated AP3406KT-ADJTRG1
- Part No.:
- AP3406KT-ADJTRG1
- Manufacturer:
- Diodes Incorporated
- Package:
- SOT-23-5 Thin, TSOT-23-5
- Datasheet:
-
AP3406KT-ADJTRG1.pdf
- Description:
- IC REG BUCK ADJ 650MA TSOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,671
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Product details
Overview
AP3406KT-ADJTRG1 from BCD Semiconductor is a 1.1MHz synchronous step-down DC-DC converter in TSOT-23-5 package, delivering up to 650mA output current with input range 2.5V–5.5V and adjustable output voltage via external resistor divider on FB pin. It integrates high-side PFET (0.44Ω) and low-side NFET (0.29Ω), supports 100% duty cycle in dropout, and features built-in short-circuit protection and thermal shutdown - ideal for single-cell Li-ion powered portable media players.
For engineers reviewing the AP3406KT-ADJTRG1 datasheet, AP3406KT-ADJTRG1 pinout, AP3406KT-ADJTRG1 application, or AP3406KT-ADJTRG1 equivalent, key selection criteria include adjustable output voltage capability, 1.1MHz fixed-frequency current-mode control, <1μA shutdown current, integrated synchronous switches, and TSOT-23-5 thermal performance (θJA = 250°C/W).
Technical Context
The AP3406KT-ADJTRG1 implements current-mode PWM control with internal slope compensation and soft-start (220μs), enabling stable transient response and reduced output overshoot during startup. Its error amplifier compares FB voltage against 0.6V reference to regulate output, while EN pin provides precise enable/disable control with 0.6V/1.5V thresholds.
Functional integration includes overtemperature detection (160°C trip, 30°C hysteresis), cycle-by-cycle current limiting (0.8–1.15A), and under-voltage lockout (2.27V rising threshold, 200mV hysteresis), ensuring robust operation across -40°C to +85°C ambient.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 1.1MHz fixed - enables compact external LC filter (e.g., 10μH inductor + 10μF ceramic capacitor) |
| Max Output Current | 650mA - sufficient for core logic rails in GPS modules and WiFi cards |
| Input Voltage Range | 2.5V to 5.5V - compatible with single Li-ion (2.7–4.2V) and USB-powered systems |
| Feedback Reference | 0.600V ±12mV - sets output voltage via R1/R2 divider; enables 0.9V–5.0V adjustment |
| Shutdown Current | <1μA - preserves battery life in standby mode of portable devices |
| Thermal Shutdown | 160°C with 30°C hysteresis - prevents permanent damage during sustained overload |
| Duty Cycle Range | 0–100% - maintains regulation even when VIN drops near VOUT (e.g., 3.3V out from 3.4V input) |
Pinout & Package
AP3406KT-ADJTRG1 is housed in a 5-pin TSOT-23-5 package (2.9mm × 1.6mm × 0.85mm), optimized for high power density and thermal dissipation (θJA = 250°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - EN | Enable control input | Active-high logic: ≥1.5V enables regulator; ≤0.6V forces shutdown with <1μA quiescent draw |
| 2 - GND | Power and signal ground | Common return path for IC bias, switch current, and feedback network; requires low-impedance PCB plane |
| 3 - SW | Switch node | Drain connection of internal PFET/NFET; drives external inductor; high dv/dt node requiring tight layout |
| 4 - VIN | Main power input | Accepts 2.5–5.5V; must be bypassed with ≥4.7μF ceramic capacitor close to pin |
| 5 - FB | Output voltage sense | Connects to resistor divider from VOUT; regulates output by comparing 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 to 95% |
| Current-mode control | Enables fast load transient response and inherent cycle-by-cycle current limiting without external sensing |
| 100% duty-cycle operation | Maintains regulation during input voltage sag (e.g., Li-ion discharge), avoiding dropout-induced system reset |
| Built-in protection suite | Combines thermal shutdown (160°C), short-circuit foldback, and UVLO (2.27V) for autonomous fault recovery |
| Low shutdown current | <1μA draw in disable state extends battery runtime in always-on portable applications |
Applications
| GPS Module Power Supply | WiFi Card Core Rail |
|---|---|
Use Scenario: Powers GPS baseband processor and RF front-end from single Li-ion cell with tight ripple requirements. IC Role / Device Role / Timing Role: Primary buck regulator generating 1.8V or 3.3V system rail with fast load-step response. Use Value: 1.1MHz switching minimizes output voltage deviation during satellite acquisition bursts (up to 650mA peak). | Use Scenario: Supplies regulated 3.3V to WLAN SoC and transceiver in mini-PCIe or M.2 form-factor cards. IC Role / Device Role / Timing Role: Adjustable-output DC-DC converter supporting multiple voltage configurations via FB divider. Use Value: Integrated current limit (0.8–1.15A) and thermal shutdown prevent latch-up during RF transmit peaks. |
| Portable Media Player Logic Rail | Digital Camera Image Sensor Bias |
Use Scenario: Delivers clean 1.2V core voltage to ARM-based application processor during video decode. IC Role / Device Role / Timing Role: High-efficiency synchronous buck converter with soft-start (220μs) preventing inrush-induced brownout. Use Value: 95% peak efficiency at 500mA reduces thermal load in sealed handheld enclosures. | Use Scenario: Generates stable 2.8V analog supply for CMOS image sensor ADC and PLL circuits. IC Role / Device Role / Timing Role: Low-noise adjustable buck regulator with tight FB reference (±2%) ensuring accurate sensor bias. Use Value: 0.6V feedback reference tolerance (±12mV) enables ±1% output accuracy over temperature and line variation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar adjustable synchronous buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP2104DQ-LF-Z | 2.5–5.5V input, 600mA, 1.5MHz, no 100% duty cycle | Lacks dropout support; unsuitable for deep-discharge Li-ion operation | Select when higher frequency allows smaller inductors and board space is constrained |
| TPS62231DRVR | 2.05–6.0V input, 600mA, 3.6MHz, integrated soft-start, 1.5% FB accuracy | Higher FB accuracy but lower max current (600mA vs. 650mA) and no thermal hysteresis spec | Prefer when tighter output regulation is critical and thermal margin is verified externally |
Compared with MP2104DQ-LF-Z and TPS62231DRVR, AP3406KT-ADJTRG1 uniquely supports 100% duty cycle and offers superior thermal hysteresis (30°C) for unattended operation in thermally dense portable designs.
Availability
AP3406KT-ADJTRG1 is available at Aetrix Electronics and suitable for GPS modules, WiFi cards, and portable media players requiring stable component supply with RoHS-compliant green packaging and TSOT-23-5 thermal performance.
Supply support for AP3406KT-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 solutions for consumer, industrial, and communications markets.
The AP3406 belongs to BCD's synchronous buck converter product line, engineered specifically for space-constrained, battery-powered portable electronics requiring high efficiency, low quiescent current, and robust protection at minimal bill-of-materials cost.
FAQ
What output voltage range can be set using the FB pin?
The AP3406KT-ADJTRG1 uses a 0.600V ±12mV internal reference at the FB pin. With standard resistor divider design, it supports output voltages from 0.9V (minimum practical) up to 5.0V (limited by VIN max of 5.5V and stability constraints). Typical configurations include 1.2V, 1.8V, 2.5V, 2.8V, and 3.3V.
Does AP3406KT-ADJTRG1 require an external Schottky diode?
No. The AP3406KT-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 - directly contributing to its 95% peak efficiency.
How does the EN pin behave during power-up sequencing?
The EN pin has a precise 0.6V low-threshold and 1.5V high-threshold with ±0.1μA leakage. When VIN rises first, EN must exceed 1.5V *after* VIN stabilizes above 2.5V to avoid premature enable. This supports controlled power sequencing in multi-rail systems where AP3406KT-ADJTRG1 is enabled only after primary supplies settle.
What is the recommended input capacitor value and type?
A minimum 4.7μF X5R/X7R ceramic capacitor is required between VIN and GND, placed within 3mm of pins 4 (VIN) and 2 (GND). For optimal EMI suppression and transient response, a parallel combination of 4.7μF + 0.1μF (1206 or 0805) is recommended, with low-ESR construction and rated for ≥6.3V DC.
AP3406KT-ADJTRG1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- SOT-23-5 Thin, TSOT-23-5
- 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:
- TSOT-23-5
AP3406KT-ADJTRG1 FAQ
1.How can I place an order for AP3406KT-ADJTRG1 through Aetrix?
Please submit a Request for Quotation (RFQ) for AP3406KT-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 AP3406KT-ADJTRG1 reliable?
The price and inventory of AP3406KT-ADJTRG1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP3406KT-ADJTRG1 is usually 5 days.
3.What payment methods are accepted for AP3406KT-ADJTRG1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP3406KT-ADJTRG1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP3406KT-ADJTRG1?
AP3406KT-ADJTRG1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP3406KT-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 AP3406KT-ADJTRG1?
For technical support, including AP3406KT-ADJTRG1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP3406KT-ADJTRG1 requirements.
6.How does Aetrix verify that AP3406KT-ADJTRG1 is sourced from the original manufacturer or authorized distributors?
All AP3406KT-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 AP3406KT-ADJTRG1 meets industry standards.
7.What is the process for return or replacement of AP3406KT-ADJTRG1?
All AP3406KT-ADJTRG1 units undergo pre-shipment inspection (PSI). If there is an issue with AP3406KT-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 AP3406KT-ADJTRG1 part is unused and in its original packaging.
Return procedure for AP3406KT-ADJTRG1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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