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Analog Devices Inc. LTC3411IMS#TRPBF
- Part No.:
- LTC3411IMS#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LTC3411IMS#TRPBF.pdf
- Description:
- IC REG BUCK BST ADJ 1.25A 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,233
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Product details
Overview
LTC3411IMS#TRPBF from Analog Devices (formerly Linear Technology) is a constant-frequency, synchronous step-down DC/DC converter optimized for medium-power portable applications. It operates from 2.63V to 5.5V input, delivers up to 1.25A output at adjustable 0.8V–5V, and supports up to 4MHz switching frequency with internal 0.11Ω P/N-channel MOSFETs. Used in notebook computers and handheld instruments for compact, high-efficiency local regulation.
For engineers reviewing the LTC3411IMS#TRPBF datasheet, LTC3411IMS#TRPBF pinout, LTC3411IMS#TRPBF application, or LTC3411IMS#TRPBF equivalent, key selection considerations include its 10-lead MSOP package, Burst Mode® operation for ultra-low IQ (60μA), 100% duty-cycle dropout capability, and external RT resistor programmability - all critical for battery-powered systems requiring stable light-load efficiency and small solution size.
Technical Context
The LTC3411IMS#TRPBF employs a current-mode control architecture with external compensation via the ITH pin, enabling precise transient response tuning across wide load and capacitor ranges. Its dual MOSFET topology integrates a 0.11Ω P-channel high-side switch and matched 0.11Ω N-channel low-side switch, supporting synchronous rectification without external diodes.
Operation is configurable via the multifunction SYNC/MODE pin: tied to SVIN for Burst Mode®, grounded for pulse-skipping, or biased at mid-SVIN for forced continuous conduction. The SHDN/RT pin simultaneously sets oscillator frequency (via external resistor) and enables shutdown, 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, USB, and regulated 3.3V/5V rails 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 Output Current | 1.25A - sustained delivery under thermal limits in MSOP package with proper PCB copper area. |
| Switching Frequency | Up to 4MHz - enables use of sub-3mm-height inductors (e.g., 2.2μH) and ceramic capacitors for ultra-compact layouts. |
| RDS(ON) (Top/Bottom) | 0.11Ω each - minimizes conduction loss at high load; enables >95% peak efficiency at 1.25A/2.5V out. |
| Quiescent Current | 60μA - ensures minimal battery drain during active light-load operation (Burst Mode®). |
| Shutdown Current | <1μA - preserves battery charge during system sleep or off-state. |
| Feedback Reference | 0.8V ±2% - tight tolerance simplifies precision output setting and improves load regulation accuracy. |
Pinout & Package
Package: 10-Lead Plastic MSOP (LTQT), 3mm × 3mm × 1.1mm profile, exposed pad soldered to SGND for thermal and electrical performance. Rated for –40°C to +125°C operating junction temperature.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SHDN/RT (1) | Shutdown enable & oscillator timing node | Pull to SVIN to disable; connect RT resistor to ground to set fOSC (e.g., 324kΩ = 1MHz); internal digital soft-start activates on wake-up. |
| SYNC/MODE (2) | Mode selection & external clock sync input | Tie to SVIN for Burst Mode®, ground for pulse-skip, or mid-SVIN for forced continuous; accepts external 0.4–4MHz clock for EMI control. |
| SGND (3) | Signal ground reference | Return for VFB, ITH, and compensation network; must be isolated from PGND except at single-point connection to minimize noise coupling. |
| SW (4) | Switch node | Connects to inductor; swings from PVIN to PGND; requires short, low-inductance trace to minimize ringing and EMI. |
| PGND (5) | Main power ground | Return for CIN, COUT, and bottom MOSFET; connects directly to PCB ground plane under exposed pad. |
| PVIN (6) | Main power input | High-current VIN path; must be decoupled locally to PGND with low-ESR ceramic capacitor (e.g., 10μF). |
| SVIN (7) | Signal power supply | Bias rail for internal circuitry; must be ≥ PVIN and decoupled to SGND; powers error amplifier, comparators, and logic. |
| PGOOD (8) | Power-good status output | Open-drain output pulled low when VOUT deviates >±7.5% from regulation; used for sequencing and fault indication. |
| VFB (9) | Feedback input | Monitors resistive divider output; 0.8V reference enables accurate output setting; sensitive to noise - route away from SW and inductor. |
| ITH (10) | Error amplifier output & current limit control | Compensation node; voltage sets peak inductor current; also used for analog soft-start and loop stability tuning. |
Key Features
| Feature | Design Value |
|---|---|
| 100% duty-cycle dropout operation | Enables VOUT tracking of declining input (e.g., discharging Li-ion) with only 60μA quiescent current - extends usable battery range. |
| Stable with ceramic output capacitors | Eliminates need for tantalum or polymer caps; reduces BOM cost and height while improving reliability - no ESR zero required for stability. |
| Selectably optimized low-load efficiency | Burst Mode® reduces gate charge losses below ~100mA load; pulse-skip lowers ripple; forced continuous enables fixed-frequency filtering in telecom apps. |
| Internal synchronous power switches | 0.11Ω RDS(ON) top/bottom MOSFETs eliminate external diode, reduce conduction loss, and improve thermal performance in MSOP package. |
| External frequency programming & sync | RT resistor sets fOSC from ~850kHz to 4MHz; SYNC/MODE accepts external clock for deterministic EMI reduction and multi-rail synchronization. |
| Short-circuit and overtemperature protection | Current-limit foldback and thermal shutdown prevent damage during fault conditions; PGOOD flag alerts host controller of output faults. |
Applications
| Portable Computing Power | Digital Camera Core Supply |
|---|---|
|
Use Scenario: Regulating 2.5V/1.25A for CPU I/O or memory interface in ultraportable notebooks with strict board height constraints. IC Role / Device Role / Timing Role: Primary synchronous buck regulator delivering tightly regulated voltage with fast load-step response and minimal footprint. Use Value: 4MHz operation enables 2.2μH inductor and 22μF ceramic output caps - solution height ≤2mm; Burst Mode® extends battery runtime during idle. |
Use Scenario: Generating 1.8V/1A for CMOS image sensor digital core in DSLR or mirrorless camera bodies. IC Role / Device Role / Timing Role: High-efficiency point-of-load converter with low-noise forced continuous mode to avoid interference with analog imaging circuits. Use Value: Forced continuous operation ensures fixed 1MHz ripple frequency - easily filtered with small LC network; PGOOD confirms stable sensor power before frame capture. |
| Cellular Baseband SoC Supply | Handheld Test Instrument LDO Pre-Regulator |
|
Use Scenario: Providing 1.2V/1.25A to LTE/5G baseband processor in smartphone application processor subsystem. IC Role / Device Role / Timing Role: High-current, low-voltage buck converter with dynamic voltage scaling support via ITH-controlled current limit. Use Value: Adjustable output (0.8V–5V) and 100% duty cycle allow seamless transition from active to deep-sleep states; <1μA shutdown current prevents battery leakage. |
Use Scenario: Stepping down 5V USB input to 3.3V/1A for powering precision ADCs and op-amps in battery-operated handheld multimeters. IC Role / Device Role / Timing Role: Compact, high-PSRR pre-regulator feeding low-noise linear regulators; prioritizes low ripple and thermal robustness. Use Value: Ceramic-capacitor stability and 0.11Ω switches deliver <10mVPP ripple at full load; MSOP package fits dense front-panel PCB layouts with minimal heatsinking. |
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 | Fixed 3.3V output (non-adjustable); 3MHz max fSW; 0.12Ω RDS(ON); 1.5A rated; no PGOOD or SYNC pin. | Best for cost-sensitive, fixed-output designs where sequencing and EMI sync are not required. | Choose TPS62130ARGTR only if output voltage is fixed at 3.3V and PGOOD/SYNC functionality is unnecessary - not a drop-in replacement. |
| MP2143GJ-Z | Adjustable 0.8–6V output; 2.5MHz max fSW; 0.13Ω RDS(ON); 1.2A rated; includes PGOOD but no Burst Mode® or SYNC. | Suitable for general-purpose 1.2A buck needs with basic protection, but lacks advanced light-load optimization. | Select MP2143GJ-Z when Burst Mode® efficiency is secondary and 2.5MHz operation suffices - verify thermal performance in MSOP-equivalent layout. |
Compared with TPS62130ARGTR and MP2143GJ-Z, the LTC3411IMS#TRPBF uniquely combines 4MHz capability, true Burst Mode® for sub-100μA IQ, PGOOD flagging, and full frequency synchronization - making it the preferred choice for high-density, battery-critical portable systems demanding both peak efficiency and design flexibility.
Availability
LTC3411IMS#TRPBF is available at Aetrix Electronics and suitable for notebook computers, digital cameras, cellular phones, and handheld instruments requiring stable component supply with guaranteed long-term manufacturability and industrial temperature support.
Supply support for LTC3411IMS#TRPBF 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 acquired Linear Technology in 2017 and maintains its legacy of high-performance power management ICs with rigorous automotive and industrial qualification standards.
The LTC3411IMS#TRPBF belongs to Linear's high-frequency synchronous buck converter product line, designed specifically for space-constrained, battery-powered applications where efficiency across load range, small solution size, and robust transient response are essential.
FAQ
What is the maximum supported switching frequency for the LTC3411IMS#TRPBF?
The LTC3411IMS#TRPBF supports up to 4MHz switching frequency, achieved by selecting an appropriate RT resistor value (e.g., ~100kΩ). While 4MHz operation is guaranteed by design, production testing is performed at lower frequencies (up to 1.15MHz), and duty cycle limitations apply at extremes - consult the Applications Information section for fO(MAX) calculation based on VOUT/VIN.
Does the LTC3411IMS#TRPBF require an external catch diode?
No, the LTC3411IMS#TRPBF does not require an external catch diode because it integrates synchronous N-channel and P-channel MOSFETs. The internal low-side switch replaces the diode, eliminating forward voltage drop and improving efficiency - especially at high currents. An optional Schottky diode may be added in rare cases for marginal efficiency gains, but it introduces parasitic capacitance and leakage that typically negate benefits.
How is output voltage set on the LTC3411IMS#TRPBF?
The LTC3411IMS#TRPBF uses a precision 0.8V internal reference connected to the VFB pin. Output voltage is set by an external resistor divider (R1 from VOUT to VFB, R2 from VFB to SGND) using the formula VOUT ≈ 0.8V × (1 + R1/R2). Feedback current is limited to ±0.1μA, allowing high-value resistors (e.g., 324kΩ/13kΩ for 2.5V) to minimize quiescent loss without compromising accuracy.
What thermal considerations apply to the LTC3411IMS#TRPBF in MSOP package?
The LTC3411IMS#TRPBF in 10-lead MSOP has θJA = 120°C/W and θJC = 45°C/W. To maintain safe junction temperature (<125°C), the exposed pad must be soldered to a minimum 100mm² copper area connected to SGND. At 1.25A load with 3.3VIN/2.5VOUT, typical power dissipation is ~150mW - adequate copper and airflow keep TJ within spec under continuous operation.
Can the LTC3411IMS#TRPBF operate with ceramic input and output capacitors only?
Yes, the LTC3411IMS#TRPBF is explicitly designed to be stable with ceramic capacitors on both input and output. However, care must be taken: use X5R or X7R dielectrics to mitigate voltage/temperature coefficients, avoid undersized ceramics that resonate with PCB trace inductance, and add 0.1–1μF high-frequency bypass caps near PVIN and VOUT pins. The control loop does not rely on ESR-based zero, unlike older controllers.
LTC3411IMS#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tape & Reel (TR)
- 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-MSOP
LTC3411IMS#TRPBF FAQ
1.How can I place an order for LTC3411IMS#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3411IMS#TRPBF 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 LTC3411IMS#TRPBF reliable?
The price and inventory of LTC3411IMS#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3411IMS#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3411IMS#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3411IMS#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3411IMS#TRPBF?
LTC3411IMS#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3411IMS#TRPBF 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 LTC3411IMS#TRPBF?
For technical support, including LTC3411IMS#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3411IMS#TRPBF requirements.
6.How does Aetrix verify that LTC3411IMS#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3411IMS#TRPBF 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 LTC3411IMS#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3411IMS#TRPBF?
All LTC3411IMS#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3411IMS#TRPBF, 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 LTC3411IMS#TRPBF part is unused and in its original packaging.
Return procedure for LTC3411IMS#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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