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Analog Devices Inc. LTC3411EDD#TRPBF
- Part No.:
- LTC3411EDD#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
LTC3411EDD#TRPBF.pdf
- Description:
- IC REG BUCK BST ADJ 1.25A 10DFN
- Quantity:
- Payment:
- Shipping:
Inventory:10,346
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Product details
Overview
LTC3411EDD#TRPBF from Analog Devices (formerly Linear Technology) is a 4MHz, synchronous step-down DC/DC converter with integrated 0.11Ω P-channel and N-channel MOSFETs, delivering up to 1.25A output current at adjustable 0.8V–5V output voltage from a 2.63V–5.5V input. It features Burst Mode® operation for ultra-low quiescent current (60μA active, ≤1μA shutdown), current-mode control for fast transient response, and support for ceramic output capacitors - deployed in space-constrained portable power rails for notebook computers and digital cameras.
For engineers reviewing the LTC3411EDD#TRPBF datasheet, LTC3411EDD#TRPBF pinout, LTC3411EDD#TRPBF application, or LTC3411EDD#TRPBF equivalent, key selection considerations include its 10-lead 3mm × 3mm DFN package, 4MHz max switching frequency enabling sub-2mm-height magnetics, 1.6A peak switch current rating, ±7.5% PGOOD threshold accuracy, and SYNC/MODE pin configurability for Burst Mode®, pulse-skipping, or forced continuous operation.
Technical Context
The LTC3411EDD#TRPBF employs a constant-frequency current-mode architecture with external RT resistor programming (up to 4MHz) or external clock synchronization via the SYNC/MODE pin. Its dual-MOSFET synchronous rectification eliminates external diode losses and supports 100% duty-cycle dropout operation.
Control loop stability is maintained through external compensation at the ITH pin, while the VFB pin references a precision 0.8V internal bandgap. The device integrates undervoltage lockout (2.5V typical), overtemperature protection, short-circuit protection, and a dedicated PGOOD open-drain output with ±7.5% regulation window.
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 resistive divider; enables core voltage scaling for processors and FPGAs. |
| Max Switching Frequency | Up to 4MHz - allows use of 2.2μH inductors ≤2mm height and compact 22μF ceramic output capacitors. |
| Peak Switch Current | 1.6A - supports 1.25A continuous output with margin for load transients and thermal derating. |
| RDS(ON) (Top/Bottom) | 0.11Ω each at 3.3V - minimizes conduction loss; enables >95% efficiency at mid-load in typical 3.3V→2.5V conversion. |
| Quiescent Current | 60μA in active mode, ≤1μA in shutdown - extends battery runtime in always-on subsystems. |
| PGOOD Accuracy | ±7.5% at VFB - provides reliable system-level power sequencing and fault detection for downstream logic. |
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 (1) | Shutdown enable & oscillator timing node | Pull to SVIN for shutdown; resistor to GND sets fOSC (e.g., 324kΩ → 1MHz); no external pull-up required. |
| SYNC/MODE (2) | Multi-function control pin | Connect to SVIN for Burst Mode®, to SGND for pulse skipping, or to mid-SVIN for forced continuous operation; accepts external clock up to 4MHz. |
| SGND (3) | Signal ground reference | Reference for feedback, compensation, and logic pins; must be separated from PGND and tied only at single point near IC. |
| SW (4) | Switch node | Drives external inductor; swings from PVIN to PGND; requires low-inductance layout to minimize EMI and ringing. |
| PGND (5) | Main power ground return | Return path for high-current inductor and output capacitor; connects directly to COUT(–) and CIN(–). |
| PVIN (6) | Main power supply input | High-current VIN path; must be decoupled to PGND with low-ESR ceramic capacitor within 2mm. |
| SVIN (7) | Signal power supply | Bias rail for internal circuitry; must be ≥ PVIN and decoupled to SGND; powers error amplifier and logic. |
| PGOOD (8) | Power-good status indicator | Open-drain output pulled low when VOUT deviates >±7.5% from target; requires external pull-up to SVIN or logic rail. |
| VFB (9) | Feedback input | Compares divided output voltage to 0.8V reference; input bias current ±0.1μA enables high-resistor-divider designs. |
| ITH (10) | Error amplifier output & compensation node | Controls peak inductor current; external RC network sets loop bandwidth and phase margin for stable transient response. |
Key Features
| Feature | Design Value |
|---|---|
| Burst Mode® operation | Reduces quiescent current to 60μA and gate charge losses at light loads, extending battery life without sacrificing regulation accuracy. |
| Synchronous rectification | Integrated 0.11Ω P-ch and N-ch MOSFETs eliminate external Schottky diode, improving efficiency by 5–10% vs. asynchronous designs. |
| 100% duty-cycle dropout | Enables VOUT to track VIN down to VIN – (ILOAD × RDS(ON) + ILOAD × RDCR(L)), critical for brownout survival in battery-powered systems. |
| Ceramic capacitor compatibility | Stable with low-ESR ceramic output caps due to current-mode control and external compensation - avoids tantalum or polymer cost/size penalties. |
| Programmable switching frequency | Resistor-set (0.85–4MHz) or externally synchronized operation enables EMI optimization and component size tradeoffs across applications. |
Applications
| Mobile Processor Core Supply | Digital Camera Image Sensor Rail |
|---|---|
Use Scenario: Powers ARM-based application processors in handheld devices requiring dynamic voltage scaling between 1.0V and 1.3V under variable compute load. IC Role / Device Role / Timing Role: Primary buck regulator delivering tightly regulated, low-noise core voltage with fast load-step response (<10μs recovery). Use Value: Burst Mode® maintains <60μA IQ during idle states, extending standby time; 4MHz operation enables 2.2μH inductor integration in <30mm² PCB area. |
Use Scenario: Supplies 2.8V/1.25A to CMOS image sensors during high-frame-rate video capture with rapid on/off cycling. IC Role / Device Role / Timing Role: High-efficiency, low-ripple power source with forced continuous mode enabled via SYNC/MODE pin for predictable EMI filtering. Use Value: 0.11Ω RDS(ON) and synchronous topology achieve >93% efficiency at full load, minimizing thermal impact on optical module alignment. |
| Notebook System Memory Rail | Portable Medical Instrument ADC Bias |
Use Scenario: Generates 1.5V/1.25A for DDR3L memory subsystems with tight ±2% output tolerance and low PSRR requirements. IC Role / Device Role / Timing Role: Secondary buck converter synchronized to system clock via SYNC/MODE pin to avoid beat frequencies with display or USB interfaces. Use Value: External compensation at ITH pin allows tuning loop response for optimal rejection of coupled noise from adjacent high-speed data lines. |
Use Scenario: Provides ultra-stable 3.3V bias for precision 16-bit SAR ADCs in battery-operated patient monitors with strict 10μVPP ripple limits. IC Role / Device Role / Timing Role: Low-noise, low-drift power stage using ceramic input/output caps and forced continuous mode to suppress switching artifacts. Use Value: ±7.5% PGOOD threshold ensures ADC reference integrity; 60μA quiescent current preserves battery capacity during intermittent measurement cycles. |
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/0.14Ω RDS(ON), fixed 1.2V/1.5V/1.8V/3.3V options; no adjustable VFB reference. | Requires external resistor divider for non-standard outputs; lacks Burst Mode® - higher light-load IQ (18μA vs. 60μA active, but no sub-μA shutdown). | Prefer when fixed-output voltage suffices and board space favors 16-pin QFN over 10-pin DFN. |
| MAX17503GCU+T | 2.2MHz max, 0.11Ω/0.12Ω RDS(ON), wider 4.5V–60V input range; includes spread-spectrum and PMBus interface. | Over-specified for low-voltage portable apps; larger 20-pin TQFN package; requires I2C host for configuration. | Prefer in industrial or automotive environments where input surge tolerance and telemetry outweigh size/cost constraints. |
Compared with TPS62130ARGTR and MAX17503GCU+T, the LTC3411EDD#TRPBF offers superior high-frequency density (4MHz), true adjustable output (0.8V–5V), and industry-leading light-load efficiency via Burst Mode®, making it optimal for compact, battery-sensitive designs where flexibility and IQ matter most.
Availability
LTC3411EDD#TRPBF is available at Aetrix Electronics and suitable for notebook computers, digital cameras, cellular phones, and handheld instruments requiring stable component supply, long-term manufacturability, and guaranteed -40°C to +85°C operation.
Supply support for LTC3411EDD#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 analog and power management ICs with rigorous qualification and long-term product support.
The LTC3411EDD#TRPBF belongs to Linear's high-frequency synchronous buck converter family, designed specifically for space-constrained, battery-powered applications demanding high efficiency across wide load ranges and robust transient performance.
FAQ
What is the maximum supported switching frequency for the LTC3411EDD#TRPBF?
The LTC3411EDD#TRPBF supports up to 4MHz switching frequency, either resistor-programmed via the SHDN/RT pin or synchronized to an external clock applied to the SYNC/MODE pin. While 4MHz operation is guaranteed by design, production testing is performed at 1MHz; actual usable frequency depends on minimum on-time and duty cycle constraints per the formula fO(MAX) ≈ 6.67 × (VOUT/VIN(MAX)) MHz.
Does the LTC3411EDD#TRPBF require an external catch diode?
No, the LTC3411EDD#TRPBF 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. An optional Schottky diode may be added in parallel with the low-side switch for marginal efficiency gains in specific Burst Mode® conditions, but it is unnecessary for standard operation and risks introducing leakage or EMI issues.
How is output voltage set on the LTC3411EDD#TRPBF?
The LTC3411EDD#TRPBF uses a precision 0.8V internal reference at the VFB pin. Output voltage is set by an external resistive 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 loop stability.
What thermal considerations apply to the LTC3411EDD#TRPBF in its DFN package?
The LTC3411EDD#TRPBF in the 10-lead 3mm × 3mm DFN package has θJA = 43°C/W when the exposed pad is soldered to a minimum 100mm² copper area tied to SGND. Junction temperature must remain ≤125°C; for 1.25A output at 3.3V→2.5V, thermal simulation shows ~45°C rise above ambient with proper layout - underscoring the need for unbroken thermal vias under the pad and separation of SGND/PGND planes.
Can the LTC3411EDD#TRPBF operate in dropout, and what happens to efficiency?
Yes, the LTC3411EDD#TRPBF supports 100% duty-cycle dropout operation: when VIN drops near VOUT, the P-channel MOSFET remains fully enhanced, passing current with only RDS(ON) and inductor DCR losses. Efficiency falls linearly with decreasing VIN-e.g., at VIN = VOUT + 0.2V, efficiency is ~75% vs. >93% at nominal input-yet regulation is maintained without oscillation or shutdown.
LTC3411EDD#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 10-WFDFN Exposed Pad
- 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 ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-DFN (3x3)
LTC3411EDD#TRPBF FAQ
1.How can I place an order for LTC3411EDD#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3411EDD#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 LTC3411EDD#TRPBF reliable?
The price and inventory of LTC3411EDD#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3411EDD#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3411EDD#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3411EDD#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3411EDD#TRPBF?
LTC3411EDD#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3411EDD#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 LTC3411EDD#TRPBF?
For technical support, including LTC3411EDD#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3411EDD#TRPBF requirements.
6.How does Aetrix verify that LTC3411EDD#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3411EDD#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 LTC3411EDD#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3411EDD#TRPBF?
All LTC3411EDD#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3411EDD#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 LTC3411EDD#TRPBF part is unused and in its original packaging.
Return procedure for LTC3411EDD#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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