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Diodes Incorporated AP3406AKT-ADJTRG1
- Part No.:
- AP3406AKT-ADJTRG1
- Manufacturer:
- Diodes Incorporated
- Package:
- SOT-23-5 Thin, TSOT-23-5
- Datasheet:
-
AP3406AKT-ADJTRG1.pdf
- Description:
- IC REG BUCK ADJ 800MA TSOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,151
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Product details
Overview
AP3406AKT-ADJTRG1 from BCD Semiconductor Manufacturing Limited is a 1.1MHz fixed-frequency, current-mode PWM synchronous buck DC-DC converter in TSOT-23-5 package, delivering up to 800mA output current with input range 2.5V–5.5V and adjustable output voltage via external resistor divider. It integrates main and synchronous switches, supports 100% duty cycle in dropout, and targets single-cell Li-ion portable power rails.
For engineers reviewing the AP3406AKT-ADJTRG1 datasheet, AP3406AKT-ADJTRG1 pinout, AP3406AKT-ADJTRG1 application, or AP3406AKT-ADJTRG1 equivalent, key selection criteria include its 1.1MHz switching frequency, 0.6V feedback reference, integrated thermal shutdown and short-circuit protection, and TSOT-23-5 footprint compatibility with space-constrained GPS, WiFi, and camera power designs.
Technical Context
The AP3406AKT-ADJTRG1 employs peak-current-mode control with internal 1.1MHz oscillator and dual MOSFET power stage (0.44Ω PFET / 0.29Ω NFET). Its feedback loop uses a precision 0.600V ±12mV reference with <50nA bias current, enabling stable regulation across -40°C to +85°C ambient.
It features under-voltage lockout (2.27V threshold with 200mV hysteresis), soft-start (220µs), and thermal shutdown at 160°C with 30°C hysteresis. The EN pin provides logic-level enable/disable with <1µA shutdown current and 0.6V/1.5V thresholds.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 1.1 MHz ±300 kHz - Enables compact LC filter design with standard 10 µH inductors and low-profile ceramic capacitors. |
| Output Current | 800 mA continuous - Sustains full load across input range (2.5V–5.5V) and temperature (-40°C to +85°C). |
| Feedback Voltage | 0.600 V ±12 mV - Sets regulated output via external resistor divider; enables precise adjustable outputs from 0.6V to >VIN×0.95. |
| Input Voltage Range | 2.5 V to 5.5 V - Matches single Li-ion (2.7–4.2V) and USB-powered systems without pre-regulation. |
| Efficiency Peak | 95 % - Achieved at mid-load (e.g., 3.6V→1.8V @ 400mA) using synchronous rectification and low RDS(on) switches. |
| Shutdown Current | <1 µA - Minimizes battery drain during system sleep; enabled by EN pin pulled below 0.6V. |
| Thermal Shutdown | 160 °C with 30 °C hysteresis - Protects die during sustained overload or poor PCB thermal design. |
Pinout & Package
AP3406AKT-ADJTRG1 is housed in a TSOT-23-5 package (1.6mm × 2.9mm × 1.1mm, 5-pin, exposed pad optional per mechanical drawing), optimized for high-density portable layouts and compatible with standard reflow profiles.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: EN | Enable control input | Logic-compatible shutdown: <0.6V disables IC (ISHDN <1µA); >1.5V enables operation. |
| 2: SW | Power switch node | Connects to inductor; internal PFET drain/NFET source node; requires low-inductance layout for EMI control. |
| 3: GND | Analog ground | Reference for FB, EN, and internal error amplifier; must be tied to PGND at single point near IC. |
| 4: VIN | Input supply rail | Accepts 2.5–5.5V; bypassed with ≥10µF ceramic capacitor directly to PGND for stability. |
| 5: FB | Feedback input | Senses output voltage via resistor divider; regulates VOUT = 0.6V × (1 + R1/R2); bias current <50nA. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated synchronous power stage | Eliminates external Schottky diode; reduces conduction loss and improves efficiency above 30% load. |
| 100% duty-cycle capability | Maintains regulation down to VIN – VOUT ≈ 0.1V, critical for Li-ion end-of-discharge operation. |
| Built-in short-circuit protection | Current-limit foldback triggers automatic hiccup mode; recovers after fault removal without reset. |
| Precision 0.6V feedback reference | ±2% tolerance over temperature ensures accurate output setting without calibration in production. |
| Low quiescent current | 600 µA typical operating supply current enables >100-hour runtime in always-on GPS/WiFi modules. |
Applications
| GPS Module Power Supply | WiFi Card Core Rail |
|---|---|
|
Use Scenario: Powers GPS baseband ICs (e.g., u-blox NEO-M8 series) from single Li-ion cell with tight ripple requirements. IC Role / Device Role / Timing Role: Primary step-down regulator generating 1.8V or 3.3V core voltage with fast transient response to burst-mode RF activity. Use Value: Delivers 800mA peak current with <20mV output ripple and 100µs load-step recovery, preserving GNSS signal acquisition integrity. |
Use Scenario: Supplies 3.3V logic rail to IEEE 802.11b/g/n WiFi cards in handheld scanners and IoT gateways. IC Role / Device Role / Timing Role: Main DC-DC converter managing dynamic current demand (0–600mA) during packet transmission bursts. Use Value: Maintains regulation during 500mA load steps with <100mV undershoot, preventing MAC layer resets and link drops. |
| Digital Still Camera Sensor Bias | Portable Media Player Audio Codec |
|
Use Scenario: Generates clean 2.8V bias for CMOS image sensor analog front-end in compact digital cameras. IC Role / Device Role / Timing Role: Low-noise, adjustable buck regulator feeding sensor analog supply; synchronized to exposure timing. Use Value: Achieves 92% efficiency at 200mA with <15mV p-p ripple, reducing thermal noise in pixel readout circuits. |
Use Scenario: Provides 1.2V core voltage to audio codec ICs (e.g., TI PCM3168A) in MP3 players and voice recorders. IC Role / Device Role / Timing Role: High-efficiency intermediate rail converter supporting variable sample-rate audio processing. Use Value: Enables >15-hour playback on 800mAh battery via 95% peak efficiency and sub-1µA shutdown leakage. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP2108DJ-LF-Z (Monolithic Power) | Fixed 1.5MHz freq, 600mA IOUT, 0.8V FB reference, no 100% duty cycle | Limited headroom for Li-ion discharge; lower current capacity restricts use in multi-rail camera systems | Select when higher switching frequency justifies reduced output current and dropout margin. |
| TPS62231DRYR (Texas Instruments) | 2.25MHz freq, 600mA IOUT, 0.6V FB, DCS-Control topology, smaller 1.5×1.5mm DSBGA | Faster transient response but lower max current; requires tighter layout for EMI control at 2.25MHz | Prefer for ultra-thin wearables where board area is constrained and load transients dominate. |
Compared with MP2108DJ-LF-Z and TPS62231DRYR, AP3406AKT-ADJTRG1 offers superior 800mA current delivery and true 100% duty-cycle operation-critical for maintaining regulation across full Li-ion voltage range-while retaining TSOT-23-5 compatibility and proven reliability in GPS and camera deployments.
Availability
AP3406AKT-ADJTRG1 is available at Aetrix Electronics and suitable for GPS module power supplies, WiFi card core rails, and portable media player audio codec rails requiring stable component supply, RoHS-compliant green packaging, and long-term industrial availability.
Supply support for AP3406AKT-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 fabless analog IC designer specializing in high-performance power management, LED drivers, and mixed-signal solutions for consumer, industrial, and automotive markets.
The AP3406A product line delivers cost-optimized, fully integrated synchronous buck converters targeting space- and efficiency-critical portable electronics powered by single-cell Li-ion batteries.
FAQ
What is the minimum input voltage required for regulation at 3.3V output?
The AP3406AKT-ADJTRG1 maintains regulation down to VIN = VOUT + (IOUT × RDS(on)) ≈ 3.3V + (0.8A × 0.44Ω) = 3.65V under worst-case PFET RDS(on). With 100% duty cycle enabled, it sustains regulation as low as 3.32V at 25°C, verified per Figure 7 load regulation curves.
Can the FB pin be left unconnected for fixed-output variants?
No. The AP3406AKT-ADJTRG1 is the adjustable version and requires an external resistor divider from VOUT to GND connected to FB to set output voltage. Fixed-output versions (e.g., AP3406AKT-33TRG1) have internal divider and do not require external resistors.
Is the TSOT-23-5 package thermally enhanced with an exposed pad?
The official mechanical drawing (Page 10) shows no thermal pad in the TSOT-23-5 variant of AP3406A. Thermal performance relies on copper pour under pins 2 (SW) and 3 (GND); θJA is rated at 250°C/W with 1-inch² 2-oz copper on JEDEC standard board.
Does the device support forced PWM mode or only auto PFM/PWM?
The AP3406AKT-ADJTRG1 operates exclusively in current-mode PWM with fixed 1.1MHz frequency and no PFM or forced-PWM mode selection. Light-load efficiency is maintained via low quiescent current (600µA), not frequency modulation.
AP3406AKT-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:
- 800mA
- 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
AP3406AKT-ADJTRG1 FAQ
1.How can I place an order for AP3406AKT-ADJTRG1 through Aetrix?
Please submit a Request for Quotation (RFQ) for AP3406AKT-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 AP3406AKT-ADJTRG1 reliable?
The price and inventory of AP3406AKT-ADJTRG1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP3406AKT-ADJTRG1 is usually 5 days.
3.What payment methods are accepted for AP3406AKT-ADJTRG1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP3406AKT-ADJTRG1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP3406AKT-ADJTRG1?
AP3406AKT-ADJTRG1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP3406AKT-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 AP3406AKT-ADJTRG1?
For technical support, including AP3406AKT-ADJTRG1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP3406AKT-ADJTRG1 requirements.
6.How does Aetrix verify that AP3406AKT-ADJTRG1 is sourced from the original manufacturer or authorized distributors?
All AP3406AKT-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 AP3406AKT-ADJTRG1 meets industry standards.
7.What is the process for return or replacement of AP3406AKT-ADJTRG1?
All AP3406AKT-ADJTRG1 units undergo pre-shipment inspection (PSI). If there is an issue with AP3406AKT-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 AP3406AKT-ADJTRG1 part is unused and in its original packaging.
Return procedure for AP3406AKT-ADJTRG1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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