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Analog Devices Inc. LTC3411IDD#PBF
- Part No.:
- LTC3411IDD#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
LTC3411IDD#PBF.pdf
- Description:
- IC REG BUCK BST ADJ 1.25A 10DFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,679
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Product details
Overview
LTC3411IDD#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, and supports Burst Mode® for ultra-low quiescent current (60μA active, ≤1μA shutdown). It is used in space-constrained, battery-powered systems such as digital cameras and handheld instruments.
For engineers reviewing the LTC3411IDD#PBF datasheet, LTC3411IDD#PBF pinout, LTC3411IDD#PBF application, or LTC3411IDD#PBF equivalent, key selection considerations include its 4MHz switching capability enabling sub-2mm-height magnetics, current-mode control for fast transient response, 100% duty-cycle dropout operation, and SYNC/MODE pin configurability for Burst Mode®, pulse-skipping, or forced continuous operation.
Technical Context
The LTC3411IDD#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 synchronous rectification eliminates external diode losses and supports high efficiency up to 95%.
Operation is controlled by three distinct low-current modes selected via the SYNC/MODE pin: Burst Mode® (for peak efficiency at light loads), pulse-skipping (for reduced output ripple), and forced continuous conduction (for fixed-frequency noise filtering). The SHDN/RT pin integrates oscillator frequency setting (via external resistor) and shutdown functionality, while PGOOD provides ±7.5% output voltage monitoring with open-drain logic output.
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 resistive divider; 0.8V feedback reference enables precise low-voltage core supply generation. |
| Switching Frequency | Up to 4MHz - allows use of compact 2.2μH inductors ≤2mm height and small ceramic capacitors. |
| Continuous Output Current | 1.25A - sustained delivery under thermal limits in DFN package at TA ≤125°C. |
| Internal Switch RDS(ON) | 0.11Ω (top/bottom) - minimizes conduction loss and enables >95% peak efficiency at mid-load. |
| Quiescent Current | 60μA - enables long battery life in always-on subsystems; drops to ≤1μA in shutdown. |
| Feedback Reference Voltage | 0.8V ±2% - tight tolerance ensures accurate output regulation across temperature and line/load conditions. |
Pinout & Package
Package: 10-lead (3mm × 3mm) plastic DFN with exposed pad soldered to SGND for thermal and electrical integrity. θJA = 43°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SHDN/RT | Shutdown enable & oscillator timing input | Drives shutdown when pulled to SVIN; sets fOSC via RT resistor to ground (e.g., 324kΩ → 1MHz). |
| SYNC/MODE | Mode selection & external clock sync input | Selects Burst Mode® (tied to SVIN), pulse-skip (tied to SGND), or forced continuous (biased at ~0.5×SVIN); accepts external 0.4–4MHz clock. |
| SGND | Signal ground reference | Return for feedback, compensation, and logic circuitry; must be isolated from PGND except at single-point connection. |
| SW | Switch node | Connects to inductor; swings from PVIN to PGND; requires low-inductance layout to minimize EMI and ringing. |
| PGND | Main power ground | Return path for high-current switch and output capacitor; connects 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 for internal analog/digital circuitry; must be ≥PVIN and decoupled to SGND; powers error amplifier and logic. |
| PGOOD | Power-good status output | Open-drain output pulled low when VOUT deviates >±7.5% from regulation; requires external pull-up. |
| VFB | Feedback input | Monitors resistive divider output; regulates VOUT by comparing to 0.8V internal reference. |
| ITH | Error amplifier output & compensation node | Sets peak inductor current limit; used for loop compensation (capacitor/resistor to SGND) and soft-start control. |
Key Features
| Feature | Design Value |
|---|---|
| 100% duty-cycle dropout operation | Enables VOUT tracking of declining VIN down to VOUT + VDS(ON), critical for battery end-of-life support. |
| Current-mode control with external compensation | Provides stable operation with diverse output capacitors (ceramic, polymer, tantalum) and enables transient response tuning. |
| Three selectable low-power operating modes | Burst Mode® (60μA IQ), pulse-skip, and forced continuous-allow trade-off between efficiency, ripple, and EMI per system requirement. |
| Integrated 0.11Ω synchronous MOSFETs | Eliminates external Schottky diode, reduces board area, and improves thermal performance vs. asynchronous designs. |
| Robust protection suite | Includes short-circuit protection, undervoltage lockout (2.5V threshold), and thermal shutdown-ensures safe operation under fault conditions. |
Applications
| Digital Camera Power Management | Handheld Instrument Core Supply |
|---|---|
Use Scenario: Powers image sensor, ISP, and memory in compact digital cameras with single Li-ion cell input. IC Role / Device Role / Timing Role: Primary step-down regulator delivering 1.2V/1.25A to processor core with fast load-step response during burst capture. Use Value: 4MHz operation enables <2mm-height inductor; Burst Mode® extends standby time between shots without compromising startup speed. | Use Scenario: Supplies 3.3V/1.25A to microcontroller, ADC, and display driver in portable test equipment. IC Role / Device Role / Timing Role: Main DC/DC converter providing regulated rail with tight line/load regulation (±0.2%) and low noise in forced continuous mode. Use Value: 0.8V reference and external divider allow precise 3.3V output; PGOOD enables safe system boot sequencing and brown-out detection. |
| Notebook Subsystem Regulator | Board-Mounted Point-of-Load Converter |
Use Scenario: Generates 1.8V/1.25A for DDR memory interface in ultraportable notebooks with strict height constraints. IC Role / Device Role / Timing Role: High-frequency POL converter placed near memory ICs to minimize IR drop and improve transient immunity. Use Value: 10-lead DFN package fits tight layouts; current-mode control maintains stability with low-ESR ceramic output caps required for high-speed memory. | Use Scenario: Replaces discrete buck modules in industrial control boards requiring reliable, field-upgradeable 2.5V/1.25A supply. IC Role / Device Role / Timing Role: Integrated synchronous buck controller + power switches delivering regulated output with minimal external components. Use Value: Internal 0.11Ω MOSFETs reduce BOM count and thermal footprint; -40°C to +125°C rating ensures operation in extended-temperature enclosures. |
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 switching frequency; 0.12Ω/0.14Ω RDS(ON); fixed 3.3V or adjustable 0.9–6V output; 2.95–6V input range. | Optimized for higher input voltages; lacks Burst Mode® but offers DCS-Control™ for ultra-fast transient response. | Prefer TPS62130ARGTR when input exceeds 5.5V or when DCS-Control™ is needed for sub-10μs load-step recovery. |
| MP2143GJ-Z | 2MHz max frequency; 0.13Ω/0.15Ω RDS(ON); 2.5–5.5V input; 0.8–5V output; 1.5A rated current; no integrated PGOOD. | Lower cost alternative with similar DFN package; missing PGOOD and tighter VFB tolerance (0.8V ±1.5%). | Choose MP2143GJ-Z where PGOOD is not required and ±1.5% output accuracy suffices for non-critical rails. |
Compared with LTC3411IDD#PBF, TPS62130ARGTR supports higher input voltage but lacks Burst Mode® efficiency optimization below 10mA, while MP2143GJ-Z trades PGOOD and tighter reference accuracy for lower unit cost-making LTC3411IDD#PBF optimal for battery-sensitive, space-constrained designs requiring robust monitoring and best-in-class light-load efficiency.
Availability
LTC3411IDD#PBF is available at Aetrix Electronics and suitable for digital camera power management, handheld instrument core supply, notebook subsystem regulation, and board-mounted point-of-load conversion requiring stable component supply across industrial and consumer production cycles.
Supply support for LTC3411IDD#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 semiconductor leader specializing in high-performance analog, mixed-signal, and power management ICs, acquired Linear Technology in 2017 to strengthen its precision power and signal chain portfolio.
The LTC3411IDD#PBF belongs to Linear's high-frequency synchronous buck converter product line, designed specifically for compact, high-efficiency DC/DC conversion in portable and battery-powered systems where size, thermal performance, and light-load efficiency are critical.
FAQ
What is the maximum supported switching frequency for the LTC3411IDD#PBF?
The LTC3411IDD#PBF supports up to 4MHz switching frequency, enabled by its high-speed current-mode architecture and optimized gate drivers. This 4MHz operation is guaranteed by design (not production-tested) and subject to duty cycle limitations per the formula fO(MAX) ≈ 6.67 × (VOUT/VIN(MAX)) MHz. At 1MHz (set by 324kΩ RT resistor), the LTC3411IDD#PBF achieves optimal balance of efficiency and component size.
How does the LTC3411IDD#PBF achieve high efficiency at light loads?
The LTC3411IDD#PBF achieves high light-load efficiency via its selectable Burst Mode® operation, activated by tying the SYNC/MODE pin to SVIN. In this mode, the P-channel MOSFET operates intermittently-delivering energy bursts only as needed-reducing gate charge losses and lowering quiescent current to 60μA. The device automatically transitions into Burst Mode® below ~100mA load, maintaining >85% efficiency down to 1mA.
Can the LTC3411IDD#PBF operate in 100% duty cycle dropout mode?
Yes, the LTC3411IDD#PBF supports true 100% duty cycle operation in dropout. When VIN falls near VOUT, the internal P-channel MOSFET remains continuously on, allowing VOUT to track VIN minus the RDS(ON) drop (≈138mV at 1.25A). This feature sustains system operation during battery discharge down to VIN = VOUT + 0.15V, extending usable battery life in portable applications.
What is the purpose of the ITH pin on the LTC3411IDD#PBF?
The ITH pin on the LTC3411IDD#PBF serves two critical functions: it is the output of the internal error amplifier (setting peak inductor current) and the primary node for loop compensation. Connecting an RC network from ITH to SGND stabilizes the control loop across varying output capacitance types. Additionally, ramping ITH voltage externally extends soft-start time beyond the default 1024-cycle digital ramp, enabling controlled power-up sequencing in multi-rail systems.
Does the LTC3411IDD#PBF require an external catch diode?
No, the LTC3411IDD#PBF does not require an external catch diode because it integrates synchronous N-channel and P-channel MOSFETs for both high-side and low-side switching. The internal synchronous rectification eliminates conduction losses associated with external Schottky diodes and improves full-load efficiency by up to 5%. An optional external diode may marginally improve light-load efficiency in specific Burst Mode® conditions but is generally unnecessary and can introduce parasitic capacitance issues.
LTC3411IDD#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 ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-DFN (3x3)
LTC3411IDD#PBF FAQ
1.How can I place an order for LTC3411IDD#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3411IDD#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 LTC3411IDD#PBF reliable?
The price and inventory of LTC3411IDD#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3411IDD#PBF is usually 5 days.
3.What payment methods are accepted for LTC3411IDD#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3411IDD#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3411IDD#PBF?
LTC3411IDD#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3411IDD#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 LTC3411IDD#PBF?
For technical support, including LTC3411IDD#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3411IDD#PBF requirements.
6.How does Aetrix verify that LTC3411IDD#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3411IDD#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 LTC3411IDD#PBF meets industry standards.
7.What is the process for return or replacement of LTC3411IDD#PBF?
All LTC3411IDD#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3411IDD#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 LTC3411IDD#PBF part is unused and in its original packaging.
Return procedure for LTC3411IDD#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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