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Analog Devices Inc. LTC3411EMS#PBF
- Part No.:
- LTC3411EMS#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LTC3411EMS#PBF.pdf
- Description:
- IC REG BUCK BST ADJ 1.25A 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,132
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Product details
Overview
LTC3411EMS#PBF from Analog Devices (formerly Linear Technology) is a 1.25A, 4MHz synchronous step-down DC/DC converter in a 10-lead MSOP package. It operates from 2.63V to 5.5V input, delivers adjustable output from 0.8V to 5V, features 0.11Ω internal 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 LTC3411EMS#PBF datasheet, LTC3411EMS#PBF pinout, LTC3411EMS#PBF application, or LTC3411EMS#PBF equivalent, key selection criteria include its 10-lead MSOP footprint, 1.6A peak switch current rating, 0.8V feedback reference, SYNC/MODE pin configurability (Burst/Pulse Skip/Forced Continuous), and dropout capability with 100% duty cycle operation.
Technical Context
The LTC3411EMS#PBF implements a constant-frequency, current-mode control architecture with external compensation via the ITH pin, enabling optimized transient response across load and output capacitor variations. Its dual MOSFET topology uses an internal P-channel high-side switch and N-channel synchronous rectifier, both rated at 0.11Ω RDS(ON) at 3.3V.
Operation is defined by three selectable modes via the SYNC/MODE pin: Burst Mode® (for <1μA IQ at light load), pulse-skipping (low ripple), or forced continuous conduction (fixed-frequency noise). The SHDN/RT pin serves dual functions-setting oscillator frequency via external resistor and enabling shutdown when pulled to SVIN.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.63V to 5.5V - supports single-cell Li-ion, USB, 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 precise low-voltage core supply generation. |
| Switching Frequency | Up to 4MHz - allows use of sub-3mm-height inductors and small ceramic capacitors for space-constrained PCBs. |
| Peak Switch Current | 1.6A - supports 1.25A continuous output with margin for transient loads and thermal derating. |
| RDS(ON) (Top/Bottom) | 0.11Ω each at 3.3V - minimizes conduction loss and enables >95% efficiency at mid-load. |
| Quiescent Current | 60μA (active), ≤1μA (shutdown) - extends battery runtime in always-on or sleep-mode applications. |
| Feedback Reference | 0.8V ±2% - stable reference with ±0.1μA input bias enables high-accuracy output regulation. |
Pinout & Package
Package: 10-Lead Plastic MSOP (LTQT marking), 3mm × 4.9mm footprint, exposed pad soldered to SGND per datasheet layout guidelines.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SHDN/RT | Shutdown control & oscillator timing | Pulling to SVIN disables device; resistor to ground sets fOSC (e.g., 324kΩ = 1MHz). |
| SYNC/MODE | Mode selection & clock sync input | Connect to SVIN (Burst), SGND (pulse skip), or mid-rail (forced continuous); accepts external 0.4–4MHz sync clock. |
| SGND | Signal ground reference | Reference for VFB, ITH, and compensation network; must be isolated from PGND except at single-point connection. |
| SW | Switch node | Drives external inductor; swings from PVIN to PGND; requires tight layout to minimize EMI and ringing. |
| PGND | Main power ground | Return path for high-current inductor and output capacitor; connects to COUT(–) and CIN(–). |
| PVIN | Main power input | High-current VIN supply; must be decoupled directly to PGND with low-ESR ceramic capacitor. |
| SVIN | Signal power supply | Bias for internal circuitry; must be ≥ PVIN and decoupled to SGND; powers error amplifier and logic. |
| PGOOD | Power-good open-drain output | Pulls low when VOUT deviates >±7.5% from regulation; used for sequencing or system fault indication. |
| VFB | Feedback input | Compares divided output voltage to 0.8V reference; sets output via R1/R2 divider (e.g., 324kΩ/13kΩ = 2.5V). |
| ITH | Error amplifier output & compensation node | Controls peak inductor current; external RC network on this pin sets loop stability and transient response. |
Key Features
| Feature | Design Value |
|---|---|
| 100% duty cycle dropout operation | Enables VOUT tracking VIN down to VOUT + VDS(ON), critical for battery-powered systems near end-of-discharge. |
| Stable with ceramic output capacitors | Eliminates need for tantalum or polymer caps, reducing cost, size, and reliability risk while simplifying BOM. |
| Current-mode control with external compensation | Allows optimization of bandwidth and phase margin for diverse output capacitance types and values (e.g., 22μF X5R vs. 100μF POSCAP). |
| Short-circuit protected | Internal current limiting prevents damage during output faults; hiccup or foldback behavior ensures safe recovery. |
| Synchronizable switching frequency | Enables noise-sensitive systems (e.g., RF receivers) to avoid interference bands by locking fOSC to a clean system clock. |
Applications
| Mobile Computing Power | Digital Imaging Core Supply |
|---|---|
Use Scenario: Powering CPU I/O, GPU memory, or chipset rails in ultraportable notebooks and tablets where board height is limited to <1.2mm. IC Role / Device Role / Timing Role: Primary step-down regulator delivering 1.2V/1.25A from 3.3V main rail with fast load-step response. Use Value: 4MHz operation enables 2.2μH inductor and 22μF ceramic output caps, achieving <3mm total solution height and <100mV load-step droop. | Use Scenario: Supplying image sensor digital core (1.8V) and analog front-end (2.8V) in DSLR or mirrorless camera modules. IC Role / Device Role / Timing Role: Dual-output configuration (using two LTC3411EMS#PBF) providing tightly regulated, low-noise supplies synchronized to avoid beat frequencies. Use Value: Forced continuous mode eliminates variable-frequency ripple, preventing image artifacts; PGOOD signals enable sensor power sequencing. |
| Cellular Baseband SoC | Handheld Test Instrumentation |
Use Scenario: Generating 1.0V/1.25A core voltage for LTE/5G baseband processors in smartphones with aggressive thermal constraints. IC Role / Device Role / Timing Role: High-efficiency buck converter operating in Burst Mode® during idle periods to extend talk time. Use Value: 60μA quiescent current and 100% dropout maintain regulation as battery drops from 4.2V to 3.0V, preserving 20+ minutes of standby runtime. | Use Scenario: Providing stable 3.3V/1.25A supply for FPGA-based signal processing in portable oscilloscopes and spectrum analyzers. IC Role / Device Role / Timing Role: Main system rail regulator with programmable soft-start and PGOOD monitoring for firmware-controlled power-up sequence. Use Value: Digital soft-start (1024-cycle ramp) limits inrush current into large FPGA VCCINT banks, preventing brownout and ensuring reliable configuration. |
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 SYNC/MODE pin - uses MODE pin for PWM/PFM only. | Lacks adjustable output and full mode flexibility; better suited for fixed-voltage, lower-cost consumer apps. | Select if fixed output and TI ecosystem support are prioritized over programmability and 4MHz capability. |
| MP2143DJ-LF-Z | 2.5MHz max, 0.13Ω RDS(ON), 0.8V ref, but no Burst Mode® - uses PFM-only light-load control; no PGOOD pin. | Missing power-good signaling and true low-IQ Burst Mode®, limiting use in sequenced or battery-critical systems. | Choose when cost sensitivity outweighs need for PGOOD, ultra-low IQ, or wide frequency tuning. |
Compared with TPS62130ARGTR and MP2143DJ-LF-Z, the LTC3411EMS#PBF offers superior design flexibility through its fully adjustable output, 4MHz capability, three-mode control via SYNC/MODE, and integrated PGOOD - making it optimal for high-performance, space-constrained, and battery-sensitive applications where precision regulation and system-level coordination are required.
Availability
LTC3411EMS#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 across temperature grades.
Supply support for LTC3411EMS#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 acquired Linear Technology in 2017 and maintains its legacy of high-performance analog and power management ICs with rigorous testing and automotive-grade reliability standards.
The LTC3411EMS#PBF belongs to Linear's high-frequency synchronous buck converter product line, designed specifically for portable and space-constrained applications demanding minimal solution size, high efficiency across load range, and robust transient response.
FAQ
What is the maximum supported switching frequency for the LTC3411EMS#PBF?
The LTC3411EMS#PBF supports up to 4MHz operation, enabled by its high-speed current-mode architecture and low-RDS(ON) MOSFETs. While 4MHz is guaranteed by design, production testing is performed at up to 1.15MHz; higher frequencies require validation of minimum on-time and duty cycle limits per the datasheet equation fO(MAX) ≈ 6.67 × (VOUT/VIN(MAX)) MHz. At 4MHz, the LTC3411EMS#PBF enables use of 2.2μH inductors under 2mm height.
How does the LTC3411EMS#PBF achieve ultra-low quiescent current in light-load conditions?
The LTC3411EMS#PBF achieves ≤1μA shutdown current and 60μA active quiescent current via integrated low-power bias circuitry and Burst Mode® operation. In Burst Mode®, the controller discontinues switching cycles when output regulation is met, eliminating gate charge losses. The P-channel MOSFET remains fully on in dropout, minimizing static current draw. This behavior is controlled by the SYNC/MODE pin and validated across –40°C to 85°C for the LTC3411EMS#PBF grade.
Can the LTC3411EMS#PBF be synchronized to an external clock, and what is the acceptable frequency range?
Yes, the LTC3411EMS#PBF can be synchronized to an external clock applied to the SYNC/MODE pin. The acceptable synchronization frequency range is 0.4MHz to 4MHz, matching its internal oscillator range. When synchronized, the device enters pulse-skipping mode, maintaining deterministic switching edges while reducing EMI. This feature is explicitly documented for the LTC3411EMS#PBF in the "Mode Selection and Frequency Synchronization" section of the datasheet.
What is the purpose of the separate PVIN and SVIN pins on the LTC3411EMS#PBF?
The LTC3411EMS#PBF uses separate PVIN (power input) and SVIN (signal power) pins to isolate high-current power paths from sensitive analog circuitry. PVIN supplies the power switches and must be decoupled directly to PGND. SVIN powers the error amplifier, reference, and logic, and must be ≥ PVIN and decoupled to SGND. This separation reduces noise coupling, improves PSRR, and ensures stable regulation - a key differentiator confirmed in the LTC3411EMS#PBF's absolute maximum ratings and pin function descriptions.
Does the LTC3411EMS#PBF support 100% duty cycle operation, and how is it implemented?
Yes, the LTC3411EMS#PBF supports true 100% duty cycle operation in dropout, where the output voltage approaches the input. During dropout, the internal P-channel MOSFET is held continuously on, allowing VOUT to track VIN minus only the RDS(ON) drop and inductor DCR. This is explicitly stated in the "Dropout Operation" section and verified by the "Note: IN DROPOUT, THE OUTPUT TRACKS THE INPUT VOLTAGE" annotation in Figure 1 of the LTC3411EMS#PBF datasheet.
LTC3411EMS#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, 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-MSOP
LTC3411EMS#PBF FAQ
1.How can I place an order for LTC3411EMS#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3411EMS#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 LTC3411EMS#PBF reliable?
The price and inventory of LTC3411EMS#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3411EMS#PBF is usually 5 days.
3.What payment methods are accepted for LTC3411EMS#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3411EMS#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3411EMS#PBF?
LTC3411EMS#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3411EMS#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 LTC3411EMS#PBF?
For technical support, including LTC3411EMS#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3411EMS#PBF requirements.
6.How does Aetrix verify that LTC3411EMS#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3411EMS#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 LTC3411EMS#PBF meets industry standards.
7.What is the process for return or replacement of LTC3411EMS#PBF?
All LTC3411EMS#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3411EMS#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 LTC3411EMS#PBF part is unused and in its original packaging.
Return procedure for LTC3411EMS#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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