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Analog Devices Inc. LTC3411AIDD#TRPBF
- Part No.:
- LTC3411AIDD#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
LTC3411AIDD#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 1.25A 10DFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,855
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Product details
Overview
LTC3411AIDD#TRPBF from Analog Devices is a 1.25A, 4MHz synchronous step-down DC/DC converter operating from 2.5V to 5.5V input, delivering adjustable output from 0.8V to 5.5V with internal 0.15Ω P-channel and 0.13Ω N-channel MOSFETs. It supports Burst Mode (IQ = 40µA), forced continuous, and pulse-skip operation for optimized efficiency in portable power rails such as digital camera core supplies.
For engineers reviewing the LTC3411AIDD#TRPBF datasheet, LTC3411AIDD#TRPBF pinout, LTC3411AIDD#TRPBF application, or LTC3411AIDD#TRPBF equivalent, this page provides verified package mapping (10-lead 3mm × 3mm DFN), confirmed current-mode control architecture, validated 0.8V feedback reference, real-world efficiency curves up to 96%, and precise thermal derating guidance for industrial-grade operation at –40°C to 125°C.
Technical Context
The LTC3411AIDD#TRPBF implements a constant-frequency current-mode control architecture with external compensation via the ITH pin, enabling stable loop response across ceramic output capacitors and wide load ranges. Its dual-MOSFET synchronous rectification eliminates external diode losses and supports 100% duty cycle dropout operation.
Frequency is set by an external RT resistor (125kΩ typical for 2.5MHz) or synchronized externally up to 4MHz; the SYNC/MODE pin selects among Burst Mode (40µA IQ), pulse-skip, or forced continuous modes-each altering ripple spectrum and light-load efficiency trade-offs without changing compensation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.5V to 5.5V - supports single-cell Li-ion, USB VBUS, and regulated 3.3V/5V rails without pre-regulation. |
| Output Voltage Range | 0.8V to 5.5V - programmable via resistive divider; 0.8V reference enables low-voltage logic core supplies (e.g., 1.2V, 1.8V). |
| Max Output Current | 1.25A - sustained delivery under thermal limits in DFN package with exposed PGND pad soldered to PCB. |
| Switching Frequency | Up to 4MHz - enables use of sub-2.2µH inductors ≤1mm height and compact ceramic capacitors. |
| Feedback Reference | 0.8V ±2% - high-accuracy bandgap reference ensures tight output regulation across temperature and line/load. |
| Quiescent Current | 40µA in Burst Mode - extends battery runtime in standby states without sacrificing wake-up speed. |
| Efficiency Peak | 96% at 1.25A - achieved via low RDS(ON) internal switches (0.15Ω top / 0.13Ω bottom) and synchronous rectification. |
| PGOOD Threshold | ±7% window - provides reliable power-good signaling with 40µs blanking to suppress transient-induced false trips. |
Pinout & Package
Package: 10-lead 3mm × 3mm plastic DFN (DD) with exposed PGND pad (Pin 11), θJA = 43°C/W. Requires soldering of exposed pad to PCB ground plane for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SHDN/RT (1) | Shutdown enable & oscillator timing | Pulling to SVIN disables device; resistor to GND sets frequency (e.g., 125kΩ → 2.5MHz); no external pull-up needed. |
| SYNC/MODE (2) | Mode selection & clock sync input | Tied to SGND = pulse-skip; to SVIN = Burst Mode; at 0.5×SVIN = forced continuous; accepts external 0.4–4MHz clock. |
| SGND (3) | Signal ground reference | Reference for VFB, ITH, PGOOD; must be isolated from PGND except at single-point star connection near IC. |
| SW (4) | Switch node | Connects to inductor; swings from PVIN to PGND; requires low-inductance layout to minimize EMI and voltage overshoot. |
| PGND (5) | Main power ground | Return path for CIN, COUT, and SW node; must be low-impedance copper pour tied to exposed pad (Pin 11). |
| PVIN (6) | Main power input | High-current input for power switches; decouple directly to PGND with ≥10µF ceramic capacitor. |
| SVIN (7) | Signal supply | Powers internal analog/digital circuitry; must be ≥PVIN and decoupled to SGND with 1µF ceramic. |
| PGOOD (8) | Open-drain power-good flag | Pulled low when VOUT deviates >±7%; requires external pull-up to SVIN or logic rail for system monitoring. |
| VFB (9) | Feedback input | Compares divided output to 0.8V reference; input bias current ±0.1µA enables high-resistance dividers (e.g., 12.1k/549k). |
| ITH (10) | Error amplifier output & current limit control | Voltage controls peak inductor current; nominal 0.4–1.4V range; used for loop compensation and soft-start ramp. |
Key Features
| Feature | Design Value |
|---|---|
| Burst Mode operation | Reduces IQ to 40µA at light loads while maintaining fast transient response and avoiding audible noise. |
| Stable with ceramic capacitors | No ESR dependency in control loop enables use of low-ESR, high-reliability MLCCs without stability risk. |
| 100% duty cycle dropout | P-channel MOSFET remains fully on when VIN ≈ VOUT, sustaining regulation down to VIN = VOUT + RDS(ON)×IOUT. |
| Prebiased output startup | Supports start-up into precharged output (e.g., hot-swap systems) without reverse current or latch-up. |
| Short-circuit protection | Current-limit foldback and thermal shutdown prevent damage during sustained overload or output short. |
| Synchronizable switching | Accepts external 0.4–4MHz clock on SYNC/MODE pin to eliminate beat frequencies in multi-rail systems. |
Applications
| Digital Camera Core Supply | Notebook CPU I/O Rail |
|---|---|
Use Scenario: Powering image sensor digital core and ISP logic requiring clean, low-noise 1.2V/1.8V at up to 1.25A. IC Role / Device Role / Timing Role: Primary synchronous buck regulator with Burst Mode for idle power savings and forced continuous mode during burst capture. Use Value: 96% peak efficiency and <25mVP-P ripple in Burst Mode extend battery life while meeting strict noise budgets for analog pixel readout. |
Use Scenario: Generating 1.05V/1.2V I/O supply for Intel/AMD mobile CPUs with dynamic load steps up to 1A/µs. IC Role / Device Role / Timing Role: High-bandwidth current-mode buck converter with external compensation for optimal transient response. Use Value: Fast load-step recovery (<10µs to settle within 1%) and 4MHz capability allow ultra-small 1.0µH inductors fitting thin-profile clamshell designs. |
| Cellular Phone Application Processor | Handheld Instrument ADC/DAC Bias |
Use Scenario: Supplying 1.1V–1.3V core voltage to application processors (e.g., Qualcomm Snapdragon) with aggressive DVFS. IC Role / Device Role / Timing Role: Adaptive voltage regulator supporting dynamic frequency scaling via VID-like feedback network. Use Value: 0.8V reference accuracy (±2%) and ±0.2% load regulation ensure precise core voltage tracking across 0–1.25A load range. |
Use Scenario: Providing ultra-low-noise 3.3V/5.0V bias for precision SAR ADCs and high-speed DACs in portable test gear. IC Role / Device Role / Timing Role: Low-ripple synchronous buck with pulse-skip mode to suppress switching artifacts near sensitive analog front-ends. Use Value: Selectable pulse-skip operation reduces conducted EMI at fixed frequency, easing compliance with CISPR-22 Class B limits. |
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 | 3V–17V input, 3A output, 2.5MHz fixed frequency; no Burst Mode, higher IQ (12µA active only). | Better suited for higher-input industrial rails; lacks selectable light-load modes and 0.8V reference flexibility. | Choose TPS62130ARGTR when input exceeds 5.5V or >1.25A output is required; avoid if Burst Mode or sub-3V input is critical. |
| MAX17503GCU+T | 4.5V–60V input, 2.5A output, 100kHz–2.2MHz adjustable frequency; requires external MOSFETs. | Designed for high-voltage industrial/motor control; not pin-compatible and demands gate driver design effort. | Choose MAX17503GCU+T for 12V/24V bus conversion; LTC3411AIDD#TRPBF remains optimal for compact 2.5–5.5V battery-powered designs. |
Compared with TPS62130ARGTR and MAX17503GCU+T, the LTC3411AIDD#TRPBF uniquely combines sub-3V operation, integrated dual-MOSFETs, 40µA Burst Mode, and 0.8V reference in a 3mm × 3mm DFN-making it the most space- and energy-efficient choice for portable 1.25A loads.
Availability
LTC3411AIDD#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 guaranteed industrial temperature grade (–40°C to 125°C).
Supply support for LTC3411AIDD#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 precision instrumentation, communications, and power management markets since 1965.
The LTC3411A series was designed specifically for high-density, medium-power portable DC/DC conversion where small size, high efficiency at light loads, and robust transient response are essential-targeting next-generation consumer and industrial edge devices.
FAQ
What is the maximum supported switching frequency for LTC3411AIDD#TRPBF?
The LTC3411AIDD#TRPBF supports up to 4MHz operation, either via external RT resistor (e.g., 47kΩ yields ~3.5MHz) or synchronization to an external clock. While 4MHz is guaranteed by design, production testing is performed at 2.5MHz; full 4MHz performance requires validation of minimum on-time constraints per application conditions.
Does LTC3411AIDD#TRPBF support prebiased output startup?
Yes, the LTC3411AIDD#TRPBF supports safe startup into a precharged output without reverse current flow or latch-up. This is enabled by its internal reverse-current protection and controlled soft-start sequence, making it suitable for hot-swap and redundant power systems where VOUT may already be biased before enable.
What is the thermal resistance (θJA) of the LTC3411AIDD#TRPBF package?
The LTC3411AIDD#TRPBF in the 10-lead 3mm × 3mm DFN (DD) package has a junction-to-ambient thermal resistance (θJA) of 43°C/W when mounted on a standard 4-layer PCB with the exposed PGND pad fully soldered to an internal ground plane. This value assumes 1in² of 2oz copper on layer 2 beneath the pad.
Can LTC3411AIDD#TRPBF operate with ceramic output capacitors only?
Yes, the LTC3411AIDD#TRPBF is explicitly designed to be stable with ceramic output capacitors-no ESR requirement is needed. Its current-mode architecture and Type II compensation via the ITH pin ensure phase margin >45° across 10µF–100µF ceramic values, eliminating the need for tantalum or polymer alternatives.
What is the shutdown current specification for LTC3411AIDD#TRPBF?
The LTC3411AIDD#TRPBF draws ≤1µA in shutdown, measured with SHDN/RT pulled to SVIN at TA = 25°C. This ultra-low quiescent current preserves battery charge in always-on systems such as IoT sensors or backup power monitors where extended shelf life is critical.
LTC3411AIDD#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
- 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-DFN (3x3)
LTC3411AIDD#TRPBF FAQ
1.How can I place an order for LTC3411AIDD#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3411AIDD#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 LTC3411AIDD#TRPBF reliable?
The price and inventory of LTC3411AIDD#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3411AIDD#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3411AIDD#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3411AIDD#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3411AIDD#TRPBF?
LTC3411AIDD#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3411AIDD#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 LTC3411AIDD#TRPBF?
For technical support, including LTC3411AIDD#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3411AIDD#TRPBF requirements.
6.How does Aetrix verify that LTC3411AIDD#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3411AIDD#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 LTC3411AIDD#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3411AIDD#TRPBF?
All LTC3411AIDD#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3411AIDD#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 LTC3411AIDD#TRPBF part is unused and in its original packaging.
Return procedure for LTC3411AIDD#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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