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Analog Devices Inc. LTC3411AEMS#PBF
- Part No.:
- LTC3411AEMS#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LTC3411AEMS#PBF.pdf
- Description:
- IC REG BUCK ADJ 1.25A 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:194
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Product details
Overview
LTC3411AEMS#PBF from Analog Devices is a 1.25A, 4MHz synchronous step-down DC/DC converter optimized for medium-power portable applications. It operates from 2.5V to 5.5V input, delivers adjustable output (0.8V–5.5V), features internal 0.15Ω P-channel and 0.13Ω N-channel MOSFETs, supports Burst Mode® (IQ = 40µA), and is packaged in a 10-lead MSOP. It powers core rails in notebook computers and cellular phones where high-frequency operation enables ultra-compact filter design.
For engineers reviewing the LTC3411AEMS#PBF datasheet, LTC3411AEMS#PBF pinout, LTC3411AEMS#PBF application, or LTC3411AEMS#PBF equivalent, key selection criteria include its 4MHz max switching frequency, 0.8V feedback reference, 100% duty-cycle dropout capability, SYNC/MODE-configurable operating modes (Burst/Pulse-Skip/Forced Continuous), and MSOP thermal performance (θJA = 120°C/W).
Technical Context
The LTC3411AEMS#PBF uses a constant-frequency current-mode architecture with external RT resistor or external clock synchronization. Its error amplifier drives the ITH pin to control peak inductor current, enabling stable regulation across wide load and output capacitor ranges.
Three low-current operating modes are selected via the SYNC/MODE pin: Burst Mode® (40µA IQ, intermittent switching), pulse-skip mode (fixed-frequency down to light loads), and forced continuous mode (constant ripple, bidirectional current capability). Dropout operation maintains regulation at 100% duty cycle when VIN approaches VOUT.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.5V to 5.5V - supports single-cell Li-ion, USB, and logic-supply inputs without pre-regulation. |
| Output Current | 1.25A continuous - sufficient for FPGA I/O banks, microprocessor cores, and ASIC power domains. |
| Switching Frequency | Up to 4MHz - enables use of sub-2mm-height inductors and 10µF ceramic output capacitors. |
| Feedback Reference | 0.8V ±2% - sets output voltage via external resistor divider; enables precise low-voltage rails (e.g., 1.2V, 1.8V, 3.3V). |
| Quiescent Current | 40µA in Burst Mode® - extends battery runtime in standby and sleep states of handheld instruments. |
| Shutdown Current | <1µA - ensures negligible drain during system-level power-off sequences. |
| Power Good Threshold | ±7% window around regulated VOUT - provides reliable enable/disable signaling for downstream logic sequencing. |
Pinout & Package
Package: 10-Lead Plastic MSOP (3mm × 3mm footprint, 1.1mm height, θJA = 120°C/W). Exposed pad not present - unlike DFN variant, MSOP uses standard lead-frame construction.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SHDN/RT (Pin 1) | Combined shutdown control and oscillator timing node | Resistor to ground sets fOSC; pulled to SVIN to enter <1µA shutdown - no external logic required. |
| SYNC/MODE (Pin 2) | Mode selection and external clock input | Configures Burst/Pulse-Skip/Forced Continuous; accepts 0.4–4MHz external sync signal for EMI reduction. |
| SGND (Pin 3) | Signal ground reference | Separate from PGND to isolate noise-sensitive analog circuitry (error amp, reference, comparators). |
| SW (Pin 4) | Switch node connection | Drives external inductor; swings from PVIN to PGND - requires low-inductance layout to minimize ringing. |
| PGND (Pin 5) | Main power ground return | Low-impedance path for high di/dt currents from bottom FET and output capacitor - must tie directly to COUT(–). |
| PVIN (Pin 6) | Main power input supply | High-current path for top FET source; requires local 10µF ceramic decoupling to PGND. |
| SVIN (Pin 7) | Signal power supply | Bias rail for internal analog circuitry; must be ≥ PVIN and decoupled to SGND - prevents noise coupling into control loop. |
| PGOOD (Pin 8) | Open-drain power-good indicator | Pulls low when VOUT deviates >±7%; 40µs blanking prevents false triggers during transients. |
| VFB (Pin 9) | Feedback input | Compares resistive-divider voltage against 0.8V reference - determines output regulation point. |
| ITH (Pin 10) | Error amplifier output / current limit threshold | Controls peak inductor current; voltage range 0.4V–1.4V - used for compensation and current limiting. |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous rectification | Integrated 0.15Ω P-ch and 0.13Ω N-ch MOSFETs eliminate external diode - achieves up to 96% efficiency at 1.25A. |
| Burst Mode® operation | Reduces IQ to 40µA at light loads while maintaining ±7% output regulation - critical for battery-powered standby time. |
| 100% duty-cycle dropout | P-ch MOSFET remains fully on when VIN ≤ VOUT + VDS(ON) - sustains output during brownout without reset. |
| Ceramic-capacitor stability | No ESR dependency in control loop - allows use of low-ESR, high-reliability ceramic output caps without phase-margin risk. |
| Prebiased output startup | Supports start-up into precharged VOUT without reverse current - safe for hot-swap and multi-rail sequencing. |
Applications
| Notebook Computers | Digital Cameras |
|---|---|
Use Scenario: Powering image sensor I/O interface and ISP core logic from single-cell Li-ion battery. IC Role / Device Role / Timing Role: Primary step-down regulator delivering 1.8V/1.2A with fast transient response to burst-mode sensor readout. Use Value: 4MHz operation enables 1.0µH inductor and 10µF ceramic cap - reduces solution size by >40% vs 1MHz designs. |
Use Scenario: Supplying CMOS image sensor analog front-end requiring ultra-low noise and tight voltage tolerance. IC Role / Device Role / Timing Role: Low-noise, forced-continuous-mode buck converter generating 2.8V rail with fixed-frequency ripple for predictable EMI filtering. Use Value: SYNC/MODE pin configures forced continuous mode - eliminates variable-frequency noise that interferes with analog signal integrity. |
| Cellular Phones | Handheld Instruments |
Use Scenario: Providing application processor core voltage (e.g., 1.1V) with dynamic voltage scaling support. IC Role / Device Role / Timing Role: High-efficiency, current-mode buck regulator with programmable frequency and soft-start for seamless DVFS transitions. Use Value: 0.8V feedback reference and external RT resistor allow precise VOUT tuning and adaptive frequency scaling to balance efficiency vs. transient response. |
Use Scenario: Powering precision ADC/DAC signal chains and microcontroller peripherals in battery-operated test equipment. IC Role / Device Role / Timing Role: Low-IQ synchronous buck supplying 3.3V/1.25A with PGOOD sequencing and robust load-step recovery. Use Value: 40µA Burst Mode® IQ extends battery life during measurement idle periods without sacrificing startup speed or regulation accuracy. |
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 | 3.6V–17V input, 3A output, fixed 3.3V/5V options only; no adjustable VFB; 2.5MHz max fSW | Requires external resistor network for non-standard outputs; less suitable for sub-3V input or fine-tuned rails | Select when higher input voltage (>5.5V) or >1.25A load is needed; avoid if 0.8V reference or 4MHz operation is required. |
| MP2143GJ-Z | 2.5V–5.5V input, 3A output, 0.8V VFB, but only 2.2MHz max fSW; no Burst Mode®, typical IQ = 300µA | Higher light-load IQ increases battery drain; lacks PGOOD and prebias startup support | Select for cost-sensitive 3A applications where 4MHz and ultra-low IQ are not critical; verify PGOOD and sequencing requirements. |
Compared with TPS62130ARGTR and MP2143GJ-Z, the LTC3411AEMS#PBF uniquely combines 4MHz operation, 40µA Burst Mode® IQ, 0.8V reference, and full feature set (PGOOD, prebias, 100% dropout) in a 10-lead MSOP - making it optimal for space-constrained, battery-critical 1.25A systems.
Availability
LTC3411AEMS#PBF is available at Aetrix Electronics and suitable for notebook computers, digital cameras, and cellular phones requiring stable component supply, long-term industrial availability, and consistent parametric performance across temperature.
Supply support for LTC3411AEMS#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. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LTC3411AEMS#PBF belongs to Analog Devices' Power Management product line, designed specifically for compact, high-efficiency DC/DC conversion in portable and battery-powered systems demanding low quiescent current and flexible frequency control.
FAQ
What is the maximum supported switching frequency for LTC3411AEMS#PBF?
The LTC3411AEMS#PBF supports up to 4MHz switching frequency, achievable via external RT resistor or external clock synchronization on the SYNC/MODE pin. This 4MHz operation is guaranteed by design (not production-tested) and subject to duty-cycle limits per the datasheet's fO(MAX) ≈ 6.67 × VOUT/VIN(MAX) constraint. At 1.8V output and 5.5V max input, practical max frequency is ~2.2MHz.
Does LTC3411AEMS#PBF support startup into a precharged output?
Yes, the LTC3411AEMS#PBF supports prebiased output startup. When enabled, the internal circuitry prevents reverse current flow during start-up into an already charged VOUT, protecting both the IC and external components. This behavior is confirmed in the Applications Information section and validated in typical performance plots (e.g., Figure G22).
What is the thermal resistance (θJA) of the LTC3411AEMS#PBF MSOP package?
The LTC3411AEMS#PBF in the 10-lead MSOP package has a junction-to-ambient thermal resistance (θJA) of 120°C/W under standard JEDEC PCB conditions (2s2p copper). This value is specified in the Absolute Maximum Ratings table and impacts maximum allowable power dissipation at a given ambient temperature.
Can LTC3411AEMS#PBF operate with ceramic output capacitors only?
Yes, the LTC3411AEMS#PBF is explicitly designed for stable operation with ceramic output capacitors. Its current-mode control loop does not rely on output capacitor ESR for compensation, eliminating the need for aluminum or tantalum caps. The datasheet recommends 10µF ceramic + 0.1µF high-frequency bypass for optimal transient response and noise suppression.
What are the absolute maximum ratings for PVIN and SVIN pins on LTC3411AEMS#PBF?
The absolute maximum rating for both PVIN and SVIN pins on the LTC3411AEMS#PBF is –0.3V to 6V. Exceeding this range may cause permanent damage. Note that SVIN must be ≥ PVIN per functional specification, and both pins require proper decoupling: PVIN to PGND and SVIN to SGND.
LTC3411AEMS#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- 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):
- 0.8V
- Voltage - Output (Max):
- 5V
- Current - Output:
- 1.25A
- Frequency - Switching:
- 2.5MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-MSOP
LTC3411AEMS#PBF FAQ
1.How can I place an order for LTC3411AEMS#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3411AEMS#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 LTC3411AEMS#PBF reliable?
The price and inventory of LTC3411AEMS#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3411AEMS#PBF is usually 5 days.
3.What payment methods are accepted for LTC3411AEMS#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3411AEMS#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3411AEMS#PBF?
LTC3411AEMS#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3411AEMS#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 LTC3411AEMS#PBF?
For technical support, including LTC3411AEMS#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3411AEMS#PBF requirements.
6.How does Aetrix verify that LTC3411AEMS#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3411AEMS#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 LTC3411AEMS#PBF meets industry standards.
7.What is the process for return or replacement of LTC3411AEMS#PBF?
All LTC3411AEMS#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3411AEMS#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 LTC3411AEMS#PBF part is unused and in its original packaging.
Return procedure for LTC3411AEMS#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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