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Diodes Incorporated AP3418KTR-G1
- Part No.:
- AP3418KTR-G1
- Manufacturer:
- Diodes Incorporated
- Package:
- SC-74A, SOT-753
- Datasheet:
-
AP3418KTR-G1.pdf
- Description:
- IC REG BUCK ADJ 1.5A SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,422
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Product details
Overview
AP3418KTR-G1 from Diodes Incorporated is a 1.4 MHz fixed-frequency, current-mode PWM synchronous buck DC-DC converter with integrated P-channel and N-channel MOSFETs (RDS(ON) = 0.2 Ω / 0.15 Ω), delivering up to 1.5 A output current across 2.5–5.5 V input, supporting adjustable 0.6 V to VIN output. It enables compact, high-efficiency power supplies for single-cell Li-ion portable devices.
For engineers reviewing the AP3418KTR-G1 datasheet, AP3418KTR-G1 pinout, AP3418KTR-G1 application, or AP3418KTR-G1 equivalent, key selection criteria include its 100% duty-cycle dropout capability, built-in soft-start, thermal shutdown, and SOT25 footprint compatibility with standard 2.2 µH inductors and low-ESR ceramic capacitors.
Technical Context
The AP3418KTR-G1 implements peak-current-mode control with internal 0.6 V reference and error amplifier feedback via the FB pin. Its oscillator operates at a tightly regulated 1.4 MHz (±20%) with minimal temperature drift, enabling small external passive components.
It integrates protection logic including cycle-by-cycle overcurrent detection (ILIM = 1.8–2.3 A), short-circuit recovery, UVLO (2.3 V threshold with 0.2 V hysteresis), and thermal shutdown at +160 °C with +20 °C hysteresis - all implemented in silicon without external components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.5 V to 5.5 V - supports direct regulation from single Li-ion (3.0–4.2 V) or USB 5 V rails without pre-regulation. |
| Switching Frequency | 1.4 MHz (typ.) - enables use of ≤2.2 µH inductors and <10 µF output capacitance for space-constrained designs. |
| Output Current | 1.5 A continuous - sufficient for core voltage supply of ARM Cortex-A/M series SoCs and display bias rails. |
| Efficiency | Up to 95% - achieved via synchronous rectification and low RDS(ON) MOSFETs, reducing conduction loss at light-to-moderate loads. |
| Feedback Reference | 0.6 V ±2% - sets output voltage via external resistor divider; enables precise 1.2 V, 1.8 V, or 3.3 V generation with <1% total error. |
| Duty Cycle Range | 0–100% - maintains regulation even during input voltage sag below output voltage (e.g., Li-ion discharge to 3.0 V while powering 3.3 V rail). |
| Quiescent Current | 62 µA (typ.) - minimizes battery drain in standby; drops to 0.1 µA in shutdown mode via EN pin control. |
Pinout & Package
AP3418KTR-G1 is housed in a RoHS-compliant, halogen-free SOT25 (SC-74A) package measuring 2.82 × 1.50 × 1.1 mm with gull-wing leads and thermal pad exposure on underside (θJA = 265 °C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - EN | Enable control input | Logic-level interface: >1.5 V enables operation; <0.4 V forces shutdown with <1 µA supply current. |
| 2 - GND | Power and signal ground | Common return path for IC bias, feedback, and switch node; must be low-inductance connection to PCB ground plane. |
| 3 - SW | Switch node output | Drain connection of internal PFET/NFET pair; connects directly to inductor; requires tight layout to minimize EMI and ringing. |
| 4 - VIN | Main power input | Accepts 2.5–5.5 V; requires ≥4.7 µF X5R/X7R ceramic capacitor placed within 3 mm of pin for high-frequency decoupling. |
| 5 - FB | Feedback input | Senses output voltage via resistor divider; 0.6 V reference sets VOUT = 0.6 × (1 + R1/R2); high-impedance input (<0.1 µA bias). |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous Buck Topology | Integrated 0.2 Ω PFET and 0.15 Ω NFET eliminate external diode, improving efficiency by 5–10% vs. asynchronous designs at 1 A load. |
| 100% Duty Cycle Operation | Maintains regulation when VIN ≤ VOUT, critical for Li-ion systems where battery voltage drops below nominal output (e.g., 3.3 V rail at end-of-discharge). |
| Built-in Soft-Start | 1 ms internal ramp prevents inrush current and output overshoot during startup; no external capacitor required. |
| Comprehensive Protection | Auto-recovering short-circuit protection, thermal shutdown with hysteresis, and cycle-by-cycle current limiting ensure robust field operation. |
| Green Compliance | Lead-free, halogen-free, and antimony-free per Diodes Inc. definitions (<900 ppm Br/Cl, <1000 ppm Sb), meeting RoHS 2 and JEDEC MSL3 standards. |
Applications
| Smartphone Core Power | Set-Top Box SoC Rail |
|---|---|
|
Use Scenario: Regulating 1.2 V core voltage for application processors (e.g., Qualcomm Snapdragon, MediaTek MT-series) from a 3.7 V Li-ion battery. IC Role / Device Role / Timing Role: Primary synchronous buck regulator providing dynamically scaled core voltage with fast transient response. Use Value: 95% peak efficiency extends battery runtime; 100% duty cycle sustains operation down to 3.0 V battery voltage without brownout. |
Use Scenario: Generating stable 1.8 V I/O rail for video decoder SoCs in HDMI-enabled set-top boxes powered from 5 V wall adapter. IC Role / Device Role / Timing Role: Secondary buck converter delivering low-noise, well-regulated I/O supply independent of main 3.3 V system rail. Use Value: Fixed 1.4 MHz switching avoids audible noise; integrated MOSFETs reduce BOM count and board area versus discrete solutions. |
| LCD TV Backlight Driver Bias | Portable Medical Monitor Display |
|
Use Scenario: Supplying 5 V bias to white LED driver ICs in edge-lit LCD TV backlights, fed from 12 V intermediate bus. IC Role / Device Role / Timing Role: Pre-regulator stepping 12 V down to 5 V, feeding downstream boost converter for LED string current control. Use Value: High efficiency reduces heat near sensitive display electronics; SOT25 footprint allows placement adjacent to LED driver IC. |
Use Scenario: Powering 3.3 V logic and analog front-end circuits in handheld ECG or pulse oximeter monitors using rechargeable Li-ion cells. IC Role / Device Role / Timing Role: Main system regulator ensuring clean, stable supply under variable load (e.g., sensor sampling bursts, Bluetooth transmission). Use Value: Low quiescent current (62 µA) preserves battery life during sleep modes; thermal shutdown prevents unsafe overheating in sealed enclosures. |
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) | 2.5–6 V input, 1.2 A max, 1.5 MHz, RDS(ON) = 0.25/0.18 Ω, no 100% duty cycle | Limited to lower current; lacks dropout support for deep battery discharge | Choose if 1.2 A suffices and board space permits larger inductor due to lower frequency tolerance. |
| TPS62130ARGTR (Texas Instruments) | 3–17 V input, 3 A, 2.5 MHz, 0.12/0.09 Ω RDS(ON), 100% duty cycle, but larger QFN-16 package | Wider input range and higher current, but requires more PCB area and thermal management | Prefer for industrial applications needing >1.5 A or >5.5 V input; avoid for ultra-compact portable designs. |
Compared with MP2108DJ-LF-Z and TPS62130ARGTR, AP3418KTR-G1 uniquely balances 1.5 A capability, 100% duty cycle, SOT25 size, and sub-100 µA quiescent current - making it optimal for space- and battery-life-constrained consumer portables.
Availability
AP3418KTR-G1 is available at Aetrix Electronics and suitable for smartphone core power, set-top box SoC rails, LCD TV backlight bias, and portable medical monitor display applications requiring stable component supply, long-term lifecycle assurance, and RoHS/Green compliance.
Supply support for AP3418KTR-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, cost-optimized power management and signal integrity solutions for consumer, industrial, and computing markets.
The AP3418 belongs to Diodes' high-efficiency DC-DC converter product line, designed specifically for compact, battery-powered applications demanding low quiescent current, wide input range, and seamless integration with standard passive components.
FAQ
What is the minimum recommended output capacitor for stable operation?
The AP3418KTR-G1 requires a minimum 22 µF ceramic output capacitor (X5R/X7R, ≤10 mΩ ESR) placed close to the FB and GND pins. This value ensures loop stability across the full 0–1.5 A load range and suppresses output ripple to <20 mVPP at 1.5 A. Larger values improve transient response but are not mandatory.
Can the AP3418KTR-G1 be used with a fixed 3.3 V output without external resistors?
No - the AP3418KTR-G1 is the adjustable version (ADJ suffix implied by part number structure and datasheet context). It requires an external resistor divider on the FB pin to set output voltage. Diodes offers fixed-output variants (e.g., AP3418-33) with different marking codes; this part is not pin-compatible with those.
How does the EN pin behave during power-up sequencing?
The EN pin has a 1.5 V turn-on threshold and 0.4 V turn-off threshold with hysteresis. When VIN rises first, EN must be pulled above 1.5 V *after* VIN exceeds UVLO (2.3 V) to guarantee proper startup. Direct connection to VIN is acceptable only if VIN ramp rate exceeds 1 V/ms; otherwise, a simple RC delay on EN is recommended.
Is thermal performance adequate in a 2-layer PCB without copper pour?
No - with θJA = 265 °C/W, the SOT25 package requires thermal vias under the exposed pad and ≥1 in² (6.5 cm²) of 1-oz copper on inner layers to achieve safe junction temperatures. On a 2-layer board without thermal relief, power dissipation must be limited to ≤0.4 W (e.g., 1.5 A at 5 V → 3.3 V conversion yields ~0.5 W loss), risking thermal shutdown above 60 °C ambient.
AP3418KTR-G1 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:
- 1.5A
- Frequency - Switching:
- 1.4MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
AP3418KTR-G1 FAQ
1.How can I place an order for AP3418KTR-G1 through Aetrix?
Please submit a Request for Quotation (RFQ) for AP3418KTR-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 AP3418KTR-G1 reliable?
The price and inventory of AP3418KTR-G1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP3418KTR-G1 is usually 5 days.
3.What payment methods are accepted for AP3418KTR-G1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP3418KTR-G1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP3418KTR-G1?
AP3418KTR-G1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP3418KTR-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 AP3418KTR-G1?
For technical support, including AP3418KTR-G1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP3418KTR-G1 requirements.
6.How does Aetrix verify that AP3418KTR-G1 is sourced from the original manufacturer or authorized distributors?
All AP3418KTR-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 AP3418KTR-G1 meets industry standards.
7.What is the process for return or replacement of AP3418KTR-G1?
All AP3418KTR-G1 units undergo pre-shipment inspection (PSI). If there is an issue with AP3418KTR-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 AP3418KTR-G1 part is unused and in its original packaging.
Return procedure for AP3418KTR-G1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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