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Analog Devices Inc. LTC3411EDD#PBF
- Part No.:
- LTC3411EDD#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
LTC3411EDD#PBF.pdf
- Description:
- IC REG BUCK BST ADJ 1.25A 10DFN
- Quantity:
- Payment:
- Shipping:
Inventory:969
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Product details
Overview
LTC3411EDD#PBF from Analog Devices (formerly Linear Technology) is a 1.25A, 4MHz synchronous step-down DC/DC converter in a 10-lead 3mm × 3mm DFN package. It operates from 2.63V to 5.5V input, delivers adjustable output from 0.8V to 5V, features 0.11Ω internal P/N-channel MOSFETs, 95% peak efficiency, and Burst Mode® operation for ultra-low quiescent current (60μA active, ≤1μA shutdown). It targets compact, battery-powered systems requiring high-frequency, low-profile power conversion.
For engineers reviewing the LTC3411EDD#PBF datasheet, LTC3411EDD#PBF pinout, LTC3411EDD#PBF application, or LTC3411EDD#PBF equivalent, key selection criteria include its 4MHz max switching frequency enabling sub-2mm-height magnetics, 1.6A peak switch current rating, current-mode control for fast transient response, 100% duty-cycle dropout capability, and SYNC/MODE pin configurability for Burst Mode®, pulse-skipping, or forced continuous operation.
Technical Context
The LTC3411EDD#PBF employs a constant-frequency current-mode architecture with external compensation via the ITH pin, enabling optimization of loop stability across wide load and output capacitance ranges. Its dual MOSFET topology integrates 0.11Ω P-channel high-side and N-channel low-side switches, supporting up to 1.6A peak inductor current and stable ceramic capacitor operation.
Operation is fully configurable through three dedicated pins: SHDN/RT sets oscillator frequency (via resistor) or enables shutdown; SYNC/MODE selects Burst Mode®, pulse skipping, or forced continuous mode-and accepts external clock synchronization; VFB senses output voltage via resistive divider referenced to a precise 0.8V internal bandgap.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.63V to 5.5V - supports single-cell Li-ion, Li-polymer, and 3.3V/5V rail inputs without pre-regulation |
| Output Voltage Range | 0.8V to 5V - set by external resistor divider; 0.8V feedback reference enables low-voltage core supply generation |
| Max Switching Frequency | Up to 4MHz - allows use of tiny inductors (e.g., 2.2μH, ≤2mm height) and small ceramic capacitors |
| Peak Switch Current | 1.6A - supports 1.25A continuous output with margin for transient loads and layout losses |
| RDS(ON) (Top/Bottom) | 0.11Ω each at 3.3V - minimizes conduction loss and thermal rise in compact DFN package |
| Quiescent Current | 60μA in active mode - extends battery runtime in always-on subsystems |
| Shutdown Current | ≤1μA - enables true system-level power gating |
| Feedback Reference | 0.8V ±2% - high-accuracy reference ensures tight output regulation over temperature and line/load |
Pinout & Package
Package: 10-lead (3mm × 3mm) plastic DFN with exposed pad soldered to SGND for thermal and electrical performance. θJA = 43°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SHDN/RT | Shutdown control & oscillator timing | Pull to SVIN for shutdown; connect resistor to GND to set fOSC (e.g., 324kΩ → 1MHz) |
| SYNC/MODE | Mode selection & clock sync input | Tie to SVIN for Burst Mode®, to SGND for pulse skipping, or apply mid-rail voltage for forced continuous operation; accepts external 0.4–4MHz clock |
| SGND | Signal ground reference | Return for feedback, compensation, and logic circuitry-must be separated from PGND to avoid noise coupling |
| SW | Switch node | Connects to inductor; swings between PVIN and PGND; requires tight layout and Kelvin connection for stability |
| PGND | Main power ground | Return path for high-current inductor and output capacitor-connect directly to COUT(–) and CIN(–) |
| PVIN | Main power input | High-current VIN supply-must be decoupled locally to PGND with low-ESR ceramic capacitor |
| SVIN | Signal power supply | Bias supply for internal analog circuitry-must be ≥ PVIN and decoupled to SGND |
| PGOOD | Power-good open-drain output | Pulls low when VOUT deviates >±7.5% from regulation-used for sequencing and fault monitoring |
| VFB | Feedback input | Senses divided output voltage; 0.8V reference enables precise output setting with minimal divider current (<0.1μA) |
| ITH | Error amplifier output & compensation node | Controls peak inductor current; used for loop compensation and soft-start ramping |
Key Features
| Feature | Design Value |
|---|---|
| Current-mode control with external compensation | Enables stable operation with wide range of output capacitors (ceramic, polymer, tantalum) and optimized transient response |
| Selectable Burst Mode® operation | Reduces gate charge losses at light loads, achieving 60μA quiescent current and extending battery life in standby |
| 100% duty-cycle dropout capability | Maintains regulation as input drops to output level-critical for battery end-of-discharge operation |
| Synchronization to external clock (0.4–4MHz) | Eliminates beat frequencies in multi-rail systems and simplifies EMI filtering by fixing switching frequency |
| Short-circuit and overtemperature protection | Prevents damage during fault conditions while maintaining reliable operation in harsh environments |
| Stable with ceramic output capacitors | Eliminates need for higher-ESR tantalum or electrolytic caps-reducing size, cost, and aging concerns |
Applications
| Notebook Computers | Digital Cameras |
|---|---|
Use Scenario: Core voltage regulation for Intel Atom or ARM-based application processors in ultraportable notebooks. IC Role / Device Role / Timing Role: Primary buck converter delivering 1.05V/1.2A to CPU core with dynamic voltage scaling support. Use Value: 4MHz operation enables <2mm-height inductor integration into thin chassis; Burst Mode® extends idle battery life beyond 10 days. | Use Scenario: Powering image sensor and ISP in compact mirrorless digital cameras. IC Role / Device Role / Timing Role: High-efficiency point-of-load regulator generating 1.8V/1.25A from single-cell Li-ion battery. Use Value: 0.11Ω RDS(ON) and 95% efficiency minimize thermal dissipation in sealed camera body; forced continuous mode ensures predictable EMI for clean image capture. |
| Cellular Phones | Handheld Instruments |
Use Scenario: Supplying RF transceiver and baseband ICs in LTE smartphones with aggressive thickness constraints. IC Role / Device Role / Timing Role: Secondary buck converter providing 3.3V/1.25A to RF front-end modules. Use Value: 3mm × 3mm DFN footprint saves PCB area vs. larger MSOP; SYNC/MODE pin allows EMI coordination with baseband clock. | Use Scenario: Powering precision ADCs, op-amps, and microcontrollers in portable multimeters and oscilloscopes. IC Role / Device Role / Timing Role: Low-noise, tightly regulated 2.5V/1.25A supply for analog signal chain components. Use Value: Current-mode architecture delivers <10μs load transient recovery; ceramic-capacitor stability avoids drift from aging electrolytics. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous step-down converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS62130ARGTR | 3MHz max frequency, 0.12Ω RDS(ON), fixed 3.3V/5V options only; no external RT or SYNC pin | Less flexible frequency and mode control; lacks adjustable output and synchronization capability | Choose for cost-sensitive, fixed-output designs where 3MHz suffices and external clock sync is unnecessary |
| MAX17503ATP+T | 2.2MHz max frequency, 0.14Ω RDS(ON), wider 4.5–60V input range; requires external MOSFETs | Designed for industrial/high-VIN applications-not suitable for single-cell battery systems | Choose only for >5V input rails; not a functional substitute for LTC3411EDD#PBF's 2.63–5.5V, integrated-FET, high-frequency profile |
Compared with TPS62130ARGTR and MAX17503ATP+T, the LTC3411EDD#PBF uniquely combines 4MHz operation, 0.8–5V adjustable output, integrated 0.11Ω FETs, and full mode/SYNC configurability-making it optimal for space-constrained, battery-powered systems demanding both efficiency and design flexibility.
Availability
LTC3411EDD#PBF is available at Aetrix Electronics and suitable for notebook computers, digital cameras, cellular phones, handheld instruments, and board-mounted power supplies requiring stable component supply, long-term lifecycle support, and consistent parametric performance.
Supply support for LTC3411EDD#PBF 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
Analog Devices, Inc. (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, formed through the acquisition of Linear Technology in 2017.
The LTC3411EDD#PBF belongs to ADI's Power by Linear™ family of high-frequency DC/DC converters, designed specifically for compact, battery-powered portable electronics requiring minimal board area, low quiescent current, and robust transient response.
FAQ
What is the maximum operating frequency of the LTC3411EDD#PBF?
The LTC3411EDD#PBF supports an oscillator frequency up to 4MHz, programmable via an external resistor on the SHDN/RT pin. While 4MHz operation is guaranteed by design, production testing is performed at lower frequencies (e.g., 1MHz with 324kΩ), and duty cycle limitations apply at the upper end-particularly when VIN is significantly higher than VOUT. For most designs, 1–3MHz offers optimal efficiency and layout simplicity.
Does the LTC3411EDD#PBF require external catch diodes?
No, the LTC3411EDD#PBF does not require an external catch diode because it integrates synchronous N-channel MOSFETs for both high-side and low-side switching. The internal bottom switch provides efficient freewheeling conduction. Adding an external Schottky diode is optional and generally discouraged-it introduces parasitic capacitance that degrades efficiency and may worsen EMI without measurable benefit in typical applications.
How is output voltage set on the LTC3411EDD#PBF?
The LTC3411EDD#PBF uses a precision 0.8V internal reference connected to the VFB pin. Output voltage is set by a resistive divider from VOUT to SGND, where VOUT = 0.8V × (1 + R1/R2). Feedback resistor values should keep divider current below 5μA to minimize load on the reference; typical values are R2 = 100kΩ and R1 = 324kΩ for 3.3V output. A feed-forward capacitor across R1 improves AC loop response.
What thermal considerations apply to the LTC3411EDD#PBF in the DFN package?
The LTC3411EDD#PBF in the 10-lead 3mm × 3mm DFN package has θJA = 43°C/W when the exposed pad is soldered to a minimum 1cm² copper area connected to SGND. To maintain junction temperature below 125°C at 1.25A load, ambient must stay below ~75°C with adequate airflow or PCB copper thermal spreading. Thermal derating begins above 85°C ambient, and the device includes internal overtemperature protection that disables switching if TJ exceeds 125°C.
Can the LTC3411EDD#PBF operate in dropout, and what happens to efficiency?
Yes, the LTC3411EDD#PBF supports 100% duty-cycle dropout operation: when VIN drops to within ~100mV of VOUT, the P-channel MOSFET remains continuously on, and VOUT tracks VIN minus RDS(ON) × ILOAD. Efficiency remains high (>90%) in dropout because only conduction loss applies-no switching loss occurs. Quiescent current stays at 60μA, preserving battery runtime during deep discharge.
LTC3411EDD#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 10-WFDFN Exposed Pad
- Packaging:
- Tube
- Product Status:
- Active
- Function:
- Step-Down, Step-Up/Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck, Buck-Boost
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2.625V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 0.8V
- Voltage - Output (Max):
- 5V
- Current - Output:
- 1.25A
- Frequency - Switching:
- 1MHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-DFN (3x3)
LTC3411EDD#PBF FAQ
1.How can I place an order for LTC3411EDD#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3411EDD#PBF 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 LTC3411EDD#PBF reliable?
The price and inventory of LTC3411EDD#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3411EDD#PBF is usually 5 days.
3.What payment methods are accepted for LTC3411EDD#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3411EDD#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3411EDD#PBF?
LTC3411EDD#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3411EDD#PBF 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 LTC3411EDD#PBF?
For technical support, including LTC3411EDD#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3411EDD#PBF requirements.
6.How does Aetrix verify that LTC3411EDD#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3411EDD#PBF 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 LTC3411EDD#PBF meets industry standards.
7.What is the process for return or replacement of LTC3411EDD#PBF?
All LTC3411EDD#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3411EDD#PBF, 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 LTC3411EDD#PBF part is unused and in its original packaging.
Return procedure for LTC3411EDD#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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