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Analog Devices Inc. LTC3411AIMS#TRPBF
- Part No.:
- LTC3411AIMS#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LTC3411AIMS#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 1.25A 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,621
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Product details
Overview
LTC3411AIMS#TRPBF from Analog Devices is a 1.25A, 4MHz synchronous step-down DC/DC converter in a 10-lead MSOP package. It operates from 2.5V to 5.5V input, delivers adjustable output (0.8V–5.5V), features current-mode control, external frequency programming via RT resistor, and supports Burst Mode (IQ = 40µA) for ultra-low-load efficiency. It is used in space-constrained portable power rails such as digital camera core supplies.
For engineers reviewing the LTC3411AIMS#TRPBF datasheet, LTC3411AIMS#TRPBF pinout, LTC3411AIMS#TRPBF application, or LTC3411AIMS#TRPBF equivalent, key selection criteria include its 4MHz max switching frequency enabling sub-1mm-height magnetics, 0.15Ω top switch RDS(ON) in MSOP, PGOOD monitoring with ±7% threshold, and support for prebiased startup - all critical for battery-powered systems requiring fast transient response and low quiescent power.
Technical Context
The LTC3411AIMS#TRPBF employs a constant-frequency current-mode architecture with external compensation at the ITH pin, enabling precise loop tuning across wide load and output capacitor ranges. Its dual-power-rail design separates PVIN (power switch supply) from SVIN (signal circuitry supply), allowing SVIN ≥ PVIN operation and improving noise isolation.
Three selectable operating modes are controlled via the SYNC/MODE pin: Burst Mode (low IQ), pulse-skipping (reduced ripple), and forced continuous conduction (fixed-frequency EMI control). The device enters 100% duty-cycle dropout when VIN approaches VOUT, maintaining regulation down to VIN = VOUT + (IL × RDS(ON)), and includes undervoltage lockout (UVLO = 2.1V typical) and short-circuit protection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.5V to 5.5V - supports single-cell Li-ion, Li-poly, and 3.3V/5V system rails without pre-regulation. |
| Max Output Current | 1.25A - sufficient for powering FPGA I/O banks, DSP cores, or image sensor interfaces. |
| Switching Frequency | Up to 4MHz - enables use of 1.0–2.2µH inductors ≤1mm height and compact ceramic capacitors. |
| Top Switch RDS(ON) | 0.15Ω (MSOP package) - reduces conduction loss at high load, supporting >95% peak efficiency at 1A. |
| Feedback Reference | 0.8V ±2% - allows precise output setting with standard resistor dividers; stable with ceramic output caps. |
| Quiescent Current | 40µA in Burst Mode - extends battery runtime in standby or low-duty-cycle sensing applications. |
| PGOOD Threshold | ±7% at VFB - provides reliable power-good assertion for microcontroller reset sequencing. |
Pinout & Package
Package: 10-Lead Plastic MSOP (3mm × 3mm × 1.1mm), exposed pad not present (unlike DFN variant); thermal resistance θJA = 120°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SHDN/RT (Pin 1) | Shutdown enable & oscillator timing node | Pulling to SVIN disables regulator; resistor to GND sets fSW (e.g., 125kΩ → 2.5MHz); no external pull-up required. |
| SYNC/MODE (Pin 2) | Mode selection & external clock sync input | GND = pulse skip; SVIN = Burst Mode; SVIN/2 = forced continuous; external clock input enables deterministic EMI control. |
| SGND (Pin 3) | Signal ground reference | Must be star-connected to feedback divider, compensation network, and VFB/ITH pins - separate from PGND to minimize noise coupling. |
| SW (Pin 4) | Power switch node | Connects directly to inductor; swings from PVIN to PGND; requires tight layout with minimal trace inductance to reduce ringing. |
| PGND (Pin 5) | Main power ground return | Return path for CIN, COUT, and SW node; must be low-impedance copper pour tied to SGND at single point near IC. |
| PVIN (Pin 6) | Main power input for high-side switch | Supplies P-channel MOSFET driver; must be decoupled locally to PGND with ≥10µF ceramic + 0.1µF high-frequency cap. |
| SVIN (Pin 7) | Signal power supply | Powers internal analog/digital circuitry; must be ≥ PVIN and decoupled to SGND; defines logic thresholds for SHDN/RT and SYNC/MODE. |
| PGOOD (Pin 8) | Open-drain power-good status | Active-low signal pulled to SGND when VOUT deviates >±7% from setpoint; 15Ω pull-down enables direct MCU GPIO interface. |
| VFB (Pin 9) | Output voltage feedback input | Compares resistive divider output to 0.8V reference; input bias current <±0.1µA enables high-impedance divider designs. |
| ITH (Pin 10) | Error amplifier output & current limit control | Voltage sets peak inductor current; compensation network connected here determines loop stability and transient response. |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous rectification | Integrated P-channel high-side + N-channel low-side switches eliminate external diode, enabling >96% efficiency at 1A and zero reverse recovery loss. |
| Burst Mode operation | Reduces IQ to 40µA at light loads while maintaining regulated output - critical for always-on sensors and RTC backup rails. |
| Prebiased output startup | Supports start-up into precharged VOUT without reverse current flow - essential for hot-swap and multi-rail sequencing systems. |
| Stable with ceramic capacitors | No ESR dependency in control loop - eliminates need for aluminum/tantalum bulk caps and simplifies layout in thin-profile devices. |
| 100% duty cycle dropout | Maintains regulation as VIN drops to VOUT + IL×RDS(ON); avoids brownout during battery sag in handheld instruments. |
Applications
| Digital Camera Core Supply | Cellular Phone Application Processor Rail |
|---|---|
Use Scenario: Powers 1.2V core of CMOS image sensor ASIC during burst capture mode with rapid load transients up to 1.25A. IC Role / Device Role / Timing Role: Primary synchronous buck regulator delivering tightly regulated, low-noise core voltage with <100µs transient recovery. Use Value: 4MHz operation minimizes inductor size to fit within 3.5mm camera module height; Burst Mode extends standby time between shots. |
Use Scenario: Supplies 1.8V I/O rail for baseband processor in LTE smartphones with dynamic DVFS scaling from 0.1mA to 1.2A. IC Role / Device Role / Timing Role: High-efficiency point-of-load converter with PGOOD sequencing for safe SoC power-up and thermal throttling coordination. Use Value: ±7% PGOOD window ensures reliable reset assertion; MSOP package fits narrow board edges adjacent to antenna modules. |
| Notebook Computer USB-C PD Sink Rail | Handheld Test Instrument ADC Reference Supply |
Use Scenario: Generates 3.3V auxiliary rail from USB-C PD input (5V–20V) using intermediate 5V bus, supporting USB peripheral enumeration. IC Role / Device Role / Timing Role: Secondary buck converter stepping down 5V system rail; synchronized to system clock to avoid beat frequencies. Use Value: SYNC/MODE pin enables external clock synchronization - suppresses conducted EMI in sensitive RF bands near Wi-Fi/BT antennas. |
Use Scenario: Provides ultra-stable 2.5V reference supply for 16-bit SAR ADC in portable multimeter, operating from 3.7V Li-ion battery. IC Role / Device Role / Timing Role: Low-noise, low-drift power source with tight line/load regulation (<0.2%/V and <0.2%) for precision measurement front-end. Use Value: 0.8V reference tolerance (±2%) and <0.04%/V line regulation ensure <0.5 LSB error over full battery discharge curve. |
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 | 3.0V–17V input; 3A output; fixed 3.3V/5V options only; no PGOOD; 2.5MHz max fSW | Better suited for higher-input industrial rails; lacks adjustable VOUT and PGOOD - unsuitable for sequenced multi-rail systems. | Select if input exceeds 5.5V or >1.25A load required; avoid when programmable output or power-good signaling is mandatory. |
| MAX17504ATP+T | 4.5V–60V input; 2A output; requires external MOSFETs; no Burst Mode; 400kHz–2.2MHz fSW | Designed for wide-input industrial/motor drives; higher BOM cost and layout complexity due to discrete FETs and gate drivers. | Choose only for >5.5V input or harsh environments; not drop-in for battery-powered consumer devices using LTC3411AIMS#TRPBF. |
Compared with TPS62130ARGTR and MAX17504ATP+T, the LTC3411AIMS#TRPBF uniquely balances ultra-high switching frequency (up to 4MHz), integrated synchronous switches, adjustable output, and PGOOD in a compact MSOP - making it optimal for space- and efficiency-constrained 2.5–5.5V battery applications where flexibility and reliability are prioritized over ultra-wide input range.
Availability
LTC3411AIMS#TRPBF 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 across temperature.
Supply support for LTC3411AIMS#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, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LTC3411A belongs to Analog Devices' Power by Linear™ family of high-frequency monolithic DC/DC converters, designed specifically for portable and space-constrained applications demanding high efficiency, small magnetics, and robust transient response.
FAQ
What is the maximum supported switching frequency for the LTC3411AIMS#TRPBF?
The LTC3411AIMS#TRPBF supports an oscillator frequency up to 4MHz, guaranteed by design (though not production-tested at that rate). This maximum is limited by minimum on-time and duty cycle constraints: fO(MAX) ≈ 6.67 × VOUT/VIN(MAX) MHz. At VOUT = 1.8V and VIN(MAX) = 5.5V, the practical upper bound is ~2.2MHz; for 4MHz operation, VIN must remain ≤ 3.0V to maintain sufficient duty cycle margin. The LTC3411AIMS#TRPBF achieves this via its high-speed current-mode control and low-RDS(ON) switches.
Does the LTC3411AIMS#TRPBF support forced continuous conduction mode (FCCM)?
Yes, the LTC3411AIMS#TRPBF supports forced continuous conduction mode via the SYNC/MODE pin: holding this pin at approximately SVIN/2 (half the SVIN voltage) configures the device for FCCM. In this mode, the inductor current never reaches zero, delivering fixed-frequency, low-amplitude output ripple ideal for noise-sensitive applications like RF transceivers or high-resolution ADCs. FCCM also enables bidirectional current capability - the LTC3411AIMS#TRPBF can both source and sink current at the output, supporting active load discharge.
Can the LTC3411AIMS#TRPBF start up into a precharged output capacitor?
Yes, the LTC3411AIMS#TRPBF explicitly supports prebiased output startup. When enabled, the internal circuitry prevents reverse current flow from the output into the regulator during start-up, avoiding potential damage to upstream sources or downstream loads. This behavior is confirmed in the datasheet's "Start-Up from Shutdown with a Prebiased Output" waveform (Figure G22) and is critical for hot-plug systems or multi-rail power architectures where rails may be powered in arbitrary sequence. The LTC3411AIMS#TRPBF maintains this capability across all operating modes including Burst Mode and FCCM.
What is the thermal performance difference between the MSOP and DFN packages of the LTC3411A?
The LTC3411AIMS#TRPBF (MSOP) has a junction-to-ambient thermal resistance θJA of 120°C/W, significantly higher than the DFN variant (LTC3411AEDD#TRPBF) at 43°C/W. This means the MSOP package dissipates heat less efficiently: at 1.25A output and 3.6V input, the MSOP's power loss (~250mW) results in ~30°C junction rise above ambient, whereas the DFN would rise only ~11°C under identical conditions. Layout mitigation - such as maximizing copper area on inner layers and using thermal vias - is essential for MSOP designs in thermally constrained enclosures. The LTC3411AIMS#TRPBF remains viable for moderate-duty-cycle applications where peak power is brief.
How does the PGOOD pin of the LTC3411AIMS#TRPBF behave during startup and fault conditions?
The PGOOD pin of the LTC3411AIMS#TRPBF is an open-drain output that pulls low when VFB deviates more than ±7% from 0.8V. During startup, it remains low until VOUT reaches regulation and stays within tolerance for ≥105µs (untripping delay); a 40µs blanking period after VFB crossing 0.8V prevents false triggering from initial overshoot. Under fault - e.g., output short, excessive load, or input UVLO - PGOOD asserts low within microseconds. It does not latch; recovery is automatic once VOUT re-enters regulation. This behavior enables direct interfacing with microcontroller reset inputs or power sequencer enable lines in the LTC3411AIMS#TRPBF-based design.
LTC3411AIMS#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
- 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
LTC3411AIMS#TRPBF FAQ
1.How can I place an order for LTC3411AIMS#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3411AIMS#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 LTC3411AIMS#TRPBF reliable?
The price and inventory of LTC3411AIMS#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3411AIMS#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3411AIMS#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3411AIMS#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3411AIMS#TRPBF?
LTC3411AIMS#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3411AIMS#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 LTC3411AIMS#TRPBF?
For technical support, including LTC3411AIMS#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3411AIMS#TRPBF requirements.
6.How does Aetrix verify that LTC3411AIMS#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3411AIMS#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 LTC3411AIMS#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3411AIMS#TRPBF?
All LTC3411AIMS#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3411AIMS#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 LTC3411AIMS#TRPBF part is unused and in its original packaging.
Return procedure for LTC3411AIMS#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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