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Analog Devices Inc. LTC3411IDD#TRPBF
- Part No.:
- LTC3411IDD#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
LTC3411IDD#TRPBF.pdf
- Description:
- IC REG BUCK BST ADJ 1.25A 10DFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,363
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Product details
Overview
LTC3411IDD#TRPBF from Analog Devices (formerly Linear Technology) is a constant-frequency, synchronous step-down DC/DC converter designed 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 with internal 0.11Ω P- and N-channel MOSFETs. Used in notebook computers and digital cameras for compact, high-efficiency local regulation.
For engineers reviewing the LTC3411IDD#TRPBF datasheet, LTC3411IDD#TRPBF pinout, LTC3411IDD#TRPBF application, or LTC3411IDD#TRPBF equivalent, key selection criteria include its 1.6A peak switch current, 60μA quiescent current in active mode, Burst Mode® operation, 100% duty-cycle dropout capability, and synchronization support for noise-sensitive systems.
Technical Context
The LTC3411IDD#TRPBF employs a current-mode control architecture with external compensation, enabling optimized transient response across wide load and output capacitance ranges. Its dual-MOSFET synchronous rectification eliminates external diode losses and supports continuous conduction down to light loads via selectable operating modes.
It integrates a programmable oscillator (via RT resistor or external clock on SYNC/MODE), undervoltage lockout (2.5V threshold), power-good monitoring (±7.5% window), and thermal shutdown. The ITH pin serves as both error amplifier output and current limit control point, while SHDN/RT combines shutdown enable and frequency setting in one terminal.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.63V to 5.5V - supports single-cell Li-ion, USB, and logic-supply 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; peak switch current rated at 1.6A for transient headroom. |
| Switching Frequency | Up to 4MHz - enables use of sub-3mm-height inductors and ceramic capacitors for ultra-compact PCB layouts. |
| RDS(ON) (Top/Bottom) | 0.11Ω each at 3.3V - minimizes conduction loss and improves full-load efficiency up to 95%. |
| IQ (Active) | 60μA - extends battery runtime in always-on subsystems without sacrificing regulation accuracy. |
| Shutdown Current | <1μA - ensures negligible drain during system sleep or standby states. |
| Operating Temp Range | –40°C to +125°C - qualified for industrial and extended-temperature embedded applications. |
Pinout & Package
Package: 10-Lead (3mm × 3mm) Plastic DFN with exposed pad soldered to SGND. Thermal resistance θJA = 43°C/W, θJC = 8°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SHDN/RT | Shutdown enable & oscillator timing input | Pulling to SVIN disables device; resistor to ground sets fOSC (e.g., 324kΩ → 1MHz); no external pull-up required. |
| SYNC/MODE | Mode selection & external clock sync | Connect to SVIN for Burst Mode®, to SGND for pulse skipping, or apply mid-rail voltage for forced continuous operation; accepts 0.4–4MHz external clock. |
| SGND | Signal ground reference | Reference for VFB, ITH, and compensation network; must be isolated from PGND to minimize noise coupling. |
| SW | Switch node | Drives external inductor; swings from PVIN to PGND; requires tight layout and low-inductance routing to reduce EMI. |
| PGND | Main power ground | Return path for high-current inductor and output capacitor; connects directly to COUT(–) and CIN(–). |
| PVIN | Main power input | High-current VIN path; must be decoupled to PGND with low-ESR ceramic capacitor near the pin. |
| SVIN | Signal power supply | Bias rail for internal analog circuitry; must be ≥ PVIN and decoupled to SGND; powers error amplifier and reference. |
| PGOOD | Power-good open-drain output | Asserts low when VOUT deviates >±7.5% from target; pulls down to SGND; requires external pull-up for system monitoring. |
| VFB | Feedback input | Monitors resistive divider output; regulated at 0.8V ±2%; input bias current <±0.1μA preserves divider efficiency. |
| ITH | Error amplifier output & current limit control | Sets peak inductor current; nominal range 0–1.5V; used for soft-start ramping and loop compensation. |
Key Features
| Feature | Design Value |
|---|---|
| Burst Mode® operation | Automatically engages below ~100mA load to reduce gate charge losses and maintain >85% efficiency at microamp loads. |
| 100% duty-cycle dropout | Enables VOUT tracking VIN with only MOSFET RDS(ON) drop - critical for battery-powered systems nearing end-of-discharge. |
| Stable with ceramic output caps | Eliminates need for tantalum or polymer capacitors; reduces BOM cost and height while improving reliability and temperature stability. |
| External frequency synchronization | Allows alignment of switching edges to avoid beat frequencies in multi-rail systems - essential for EMI compliance in dense PCBs. |
| Short-circuit protected | Current-limit foldback and hiccup mode prevent thermal runaway during output faults without requiring external current-sense components. |
| Low-noise pulse-skipping mode | Reduces output ripple and audible noise compared to Burst Mode® - preferred for camera sensor and audio subsystem supplies. |
Applications
| Mobile Baseband Power | Digital Camera Core Supply |
|---|---|
Use Scenario: Powers ARM-based baseband processor in cellular handsets requiring dynamic voltage scaling between 1.0V and 1.3V at up to 1.2A peak. IC Role / Device Role / Timing Role: Primary buck regulator delivering tightly regulated core voltage with fast load-transient response and seamless transition into Burst Mode® during idle periods. Use Value: Achieves >92% efficiency at 10mA standby and maintains <15mV output droop during 1A load steps - extending talk time and preventing processor brownouts. | Use Scenario: Supplies image signal processor (ISP) and CMOS sensor in compact digital cameras where board space is constrained to <8mm² per rail. IC Role / Device Role / Timing Role: Compact, high-frequency buck converter generating 1.8V/1.25A from a 3.3V battery rail using 2.2μH/22μF ceramic-only passive set. Use Value: Enables 3mm × 3mm DFN footprint with 2mm-height inductor; eliminates need for external Schottky diode and reduces solution volume by 40% vs. legacy controllers. |
| Notebook System Agent Rail | Handheld Instrument ADC Reference |
Use Scenario: Generates 1.05V system agent voltage for Intel Atom-class SoCs in fanless notebooks with strict thermal envelope (<1.5W dissipation). IC Role / Device Role / Timing Role: Synchronous buck converter operating at 2MHz to avoid AM radio band; synchronized to system clock to suppress conducted emissions. Use Value: Delivers 1.25A with <60mVpp ripple and 94% efficiency at full load while maintaining junction temperature <95°C under continuous operation. | Use Scenario: Provides ultra-low-noise 3.3V supply for 16-bit SAR ADC in portable multimeters where PSRR and ripple directly impact measurement accuracy. IC Role / Device Role / Timing Role: Buck regulator configured in forced continuous mode to fix switching frequency at 1MHz - enabling precise EMI filtering and predictable noise spectrum. Use Value: Reduces 1/f noise contribution and achieves <5μVRMS output ripple - improving effective resolution by 0.5 LSB over competing solutions. |
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; 3.5V–17V input; lower max IOUT (3A); no SYNC pin; 2.5MHz fixed fSW | Best for fixed-output, higher-input systems where footprint and simplicity outweigh programmability needs. | Select when output voltage is static and input exceeds 5.5V - not suitable for battery-fed 2.63–5.5V designs requiring adjustable VOUT. |
| MP2143GJ-Z | 2.5V–6V input; 1.2A max IOUT; 0.8V reference; no Burst Mode®; 500kHz–2.5MHz adjustable fSW | Lacks low-IQ modes and PGOOD - suited for cost-sensitive industrial controls rather than battery longevity-critical devices. | Choose for non-portable applications where 60μA IQ and ±7.5% PGOOD monitoring are unnecessary. |
Compared with TPS62130ARGTR and MP2143GJ-Z, the LTC3411IDD#TRPBF uniquely combines 2.63V minimum input, 60μA quiescent current, Burst Mode®, and 4MHz capability in a 3mm × 3mm DFN - making it optimal for space-constrained, battery-powered systems demanding wide VIN range and ultra-low standby loss.
Availability
LTC3411IDD#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 LTC3411IDD#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. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and power management semiconductors.
The LTC3411IDD#TRPBF belongs to Linear's high-frequency synchronous buck converter product line, engineered specifically for portable electronics requiring minimal solution size, high efficiency across load range, and robust thermal performance in extended temperature environments.
FAQ
What is the maximum supported switching frequency for the LTC3411IDD#TRPBF?
The LTC3411IDD#TRPBF supports up to 4MHz switching frequency, either via external RT resistor programming or synchronization to an external clock applied to the SYNC/MODE pin. While 4MHz operation is guaranteed by design, production testing is performed at 1MHz; users must verify stability and thermal performance at 4MHz based on their specific layout and component selection.
Does the LTC3411IDD#TRPBF require an external catch diode?
No, the LTC3411IDD#TRPBF does not require an external catch diode because it integrates synchronous P-channel and N-channel MOSFETs. The bottom N-MOSFET provides active rectification, eliminating conduction losses and reverse recovery issues associated with discrete diodes - simplifying design and improving efficiency.
How is output voltage programmed on the LTC3411IDD#TRPBF?
The LTC3411IDD#TRPBF output voltage is programmed using an external resistive divider connected between VOUT, VFB, and SGND. With a precise 0.8V internal reference at VFB, the output follows VOUT ≈ 0.8V × (1 + R1/R2). Divider current should remain below 5μA to preserve light-load efficiency, and feed-forward capacitor CF may be added to improve transient response.
What thermal considerations apply to the LTC3411IDD#TRPBF in DFN package?
The LTC3411IDD#TRPBF in 10-lead DFN has θJA = 43°C/W and requires the exposed pad to be soldered to a solid SGND plane for effective heat transfer. At 1.25A output and 3.3V input, typical power dissipation is ~250mW; with 25°C ambient, this yields ~35°C junction rise - well within the 125°C max rating. Layout must minimize thermal resistance from die to PCB copper.
Can the LTC3411IDD#TRPBF operate in dropout, and what happens to efficiency?
Yes, the LTC3411IDD#TRPBF supports 100% duty-cycle dropout operation: when VIN drops near VOUT, the P-channel MOSFET remains fully on, passing current with only RDS(ON) loss (~110mΩ). Efficiency falls linearly with decreasing VIN-e.g., at VIN = VOUT + 0.1V and 1.25A, conduction loss is ~138mW - but regulation is maintained without shutdown.
LTC3411IDD#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 ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-DFN (3x3)
LTC3411IDD#TRPBF FAQ
1.How can I place an order for LTC3411IDD#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3411IDD#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 LTC3411IDD#TRPBF reliable?
The price and inventory of LTC3411IDD#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3411IDD#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3411IDD#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3411IDD#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3411IDD#TRPBF?
LTC3411IDD#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3411IDD#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 LTC3411IDD#TRPBF?
For technical support, including LTC3411IDD#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3411IDD#TRPBF requirements.
6.How does Aetrix verify that LTC3411IDD#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3411IDD#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 LTC3411IDD#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3411IDD#TRPBF?
All LTC3411IDD#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3411IDD#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 LTC3411IDD#TRPBF part is unused and in its original packaging.
Return procedure for LTC3411IDD#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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