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Analog Devices Inc. LTC3411AEDD#PBF
- Part No.:
- LTC3411AEDD#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
LTC3411AEDD#PBF.pdf
- Description:
- IC REG BUCK ADJ 1.25A 10DFN
- Quantity:
- Payment:
- Shipping:
Inventory:5,402
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Product details
Overview
LTC3411AEDD#PBF from Analog Devices is a 1.25A, 4MHz synchronous step-down DC/DC converter operating from 2.5V to 5.5V input, delivering adjustable 0.8V–5.5V output with internal 0.15Ω P-channel and 0.13Ω N-channel MOSFETs in a 3mm × 3mm DFN-10 package. It supports Burst Mode (IQ = 40µA), forced continuous, and pulse-skip operation for notebook computers, digital cameras, and handheld instruments.
For engineers reviewing the LTC3411AEDD#PBF datasheet, LTC3411AEDD#PBF pinout, LTC3411AEDD#PBF application, or LTC3411AEDD#PBF equivalent, key selection criteria include its 4MHz max switching frequency enabling sub-1mm-height magnetics, ±7% PGOOD accuracy, 0.8V feedback reference, 1.25A peak switch current limit, and support for prebiased startup - all validated for industrial-grade –40°C to 125°C operation.
Technical Context
The LTC3411AEDD#PBF implements a constant-frequency current-mode control architecture with external RT resistor or SYNC clock synchronization, enabling precise transient response tuning via ITH compensation. Its dual-power-rail design separates PVIN (main power) from SVIN (signal power), requiring SVIN ≥ PVIN and independent decoupling to PGND and SGND respectively.
Three low-load operating modes are selected via the SYNC/MODE pin: Burst Mode (IQ = 40µA, 25mVP-P ripple), pulse skipping (reduced EMI), or forced continuous (fixed-frequency ripple). Dropout operation maintains 100% duty cycle with P-channel MOSFET fully on, while undervoltage lockout disables operation below 2.1V VIN.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.5V to 5.5V - supports single-cell Li-ion, USB, and logic-supply rails without external LDO pre-regulation. |
| Output Voltage Range | 0.8V to 5.5V - set by external resistive divider; 0.8V feedback reference enables core voltage regulation for modern processors. |
| Max Switching Frequency | Up to 4MHz - allows use of 1.0–2.2µH inductors ≤1mm height and compact ceramic capacitors. |
| Peak Switch Current Limit | 1.6A to 2.6A - ensures robust short-circuit protection across temperature; typical 2.1A at TA = 25°C. |
| Feedback Reference Voltage | 0.784V to 0.816V (±2%) - tight tolerance enables <±1% output accuracy with precision resistors. |
| Quiescent Current (Burst) | 40µA typical - extends battery runtime in standby mode without compromising wake-up response. |
| Shutdown Current | <1µA - enables true system-level power gating for zero-leakage sleep states. |
| Power Good Accuracy | ±7% trip threshold - provides reliable rail monitoring for FPGA/CPU sequencing with 40µs blanking delay. |
Pinout & Package
Package: 10-lead 3mm × 3mm plastic DFN (DD) with exposed PGND pad (Pin 11), rated for –40°C to 125°C junction temperature and θJA = 43°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SHDN/RT (1) | Shutdown enable & oscillator timing | Pulling to SVIN disables device; resistor to GND sets fOSC (125kΩ → 2.5MHz); no external pull-up required. |
| SYNC/MODE (2) | Mode selection & clock sync input | Tied to SVIN = Burst Mode; SGND = pulse skip; SVIN/2 = forced continuous; external clock accepted 0.4–4MHz. |
| SGND (3) | Signal ground reference | Reference for VFB, ITH, PGOOD; must be isolated from PGND except at single-point star ground. |
| SW (4) | Switch node | Connects to inductor; swings from PVIN to PGND; requires low-inductance layout to minimize ringing. |
| PGND (5) | Main power ground | Return path for CIN, COUT, and exposed pad; must be solid copper pour under DFN body. |
| PVIN (6) | Main power input | Supplies high-side P-MOSFET; requires local 1–10µF ceramic capacitor to PGND. |
| SVIN (7) | Signal power supply | Powers internal analog/digital circuitry; must be ≥ PVIN and decoupled to SGND with 0.1–1µF ceramic. |
| PGOOD (8) | Open-drain power-good indicator | Pulled low when VOUT deviates >±7%; 15–30Ω pull-down resistance; 40/105µs blanking delays prevent false triggers. |
| VFB (9) | Feedback input | Compares divided VOUT to 0.8V reference; ±0.1µA input bias enables high-impedance dividers. |
| ITH (10) | Error amplifier output & current limit control | 0.4–1.4V range sets peak inductor current; used for loop compensation and soft-start ramp. |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous rectification | Integrated 0.15Ω P-MOSFET + 0.13Ω N-MOSFET eliminates external diode, enabling >96% efficiency at 1.25A. |
| Burst Mode operation | 40µA quiescent current with 25mVP-P output ripple - optimal for battery-powered systems with intermittent load profiles. |
| Prebiased output startup | Supports VOUT precharged up to 3V without reverse current flow - essential for hot-swap and multi-rail sequencing. |
| Stable with ceramic capacitors | No ESR dependency in control loop - enables use of low-ESR, high-reliability MLCCs without stability compensation. |
| 100% duty cycle dropout | P-MOSFET remains fully on as VIN approaches VOUT - maintains regulation down to VIN = VOUT + RDS(ON) × ILOAD. |
| Short-circuit protection | Current-mode architecture limits peak switch current to 2.1A typical - prevents thermal runaway during output faults. |
Applications
| Mobile Computing Power | Digital Imaging Core Supply |
|---|---|
Use Scenario: Regulating 1.2V/1.8V core voltage for ARM-based application processors in ultra-thin notebooks and tablets. IC Role / Device Role / Timing Role: Primary buck regulator delivering 1.25A continuous current with fast load-step response (<100µs recovery). Use Value: 4MHz operation enables 2.2µH inductor ≤1mm height, reducing board area by 40% vs 1MHz designs while maintaining >92% efficiency at 500mA. | Use Scenario: Powering CMOS image sensor analog and digital rails in DSLR and mirrorless camera bodies. IC Role / Device Role / Timing Role: Dual-output source (via two LTC3411AEDD#PBF) for 2.8V sensor analog and 1.2V digital domains with independent PGOOD monitoring. Use Value: Forced continuous mode delivers fixed 1MHz ripple easily filtered by LC stages, meeting stringent image noise requirements (<10µV RMS). |
| Handheld Instrument Battery Management | Board-Mounted Telecom Module Supply |
Use Scenario: Providing 3.3V/1.25A rail for portable oscilloscopes and multimeters powered by 2-cell Li-ion packs. IC Role / Device Role / Timing Role: Main system regulator with Burst Mode active during measurement idle periods to extend battery life. Use Value: 40µA IQ in Burst Mode increases runtime by 3.2× vs forced continuous mode at 10mA load, verified over –20°C to 60°C ambient. | Use Scenario: Generating 1.8V/1.25A for FPGA configuration and transceiver logic in small-form-factor telecom edge modules. IC Role / Device Role / Timing Role: Synchronized buck converter locked to system clock to eliminate beat frequencies in RF-sensitive environments. Use Value: SYNC input accepts 2.5MHz external clock, aligning switching edges to avoid interference with 2.4GHz/5GHz WiFi bands. |
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 | 3.6V–17V input, 3A output, 2.5MHz fixed frequency; no SYNC pin; lower IQ (18µA) but no prebias support. | Better for wide-input industrial supplies; unsuitable for sub-3V battery inputs or precharged outputs. | Select when input exceeds 5.5V or higher current (>1.25A) is needed; verify PGOOD compatibility with host sequencer. |
| MAX17503GCU+T | 4.5V–60V input, 2.5A output, 100kHz–2.2MHz adjustable frequency; requires external MOSFETs; higher BOM cost. | Targeted at high-voltage industrial/motor drives; incompatible with low-VIN battery systems. | Choose only for >12V input rails; not a drop-in replacement due to external FET requirement and different pinout. |
Compared with TPS62130ARGTR and MAX17503GCU+T, the LTC3411AEDD#PBF uniquely combines sub-3V operation, prebias startup, and 4MHz capability in a 3mm × 3mm DFN - making it optimal for space-constrained, battery-powered applications where input voltage headroom is minimal and sequencing integrity is critical.
Availability
LTC3411AEDD#PBF is available at Aetrix Electronics and suitable for notebook computers, digital cameras, and handheld instruments requiring stable component supply with guaranteed long-term availability and full traceability.
Supply support for LTC3411AEDD#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, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and consumer markets.
The LTC3411AEDD#PBF belongs to the LTC® µModule and monolithic DC/DC converter product line, designed specifically for high-density, high-efficiency power conversion in portable and battery-operated systems demanding ultra-low quiescent current and minimal PCB footprint.
FAQ
What is the maximum supported switching frequency for LTC3411AEDD#PBF?
The LTC3411AEDD#PBF supports up to 4MHz switching frequency, guaranteed by design (not production tested) and subject to duty cycle limitations per the formula fO(MAX) ≈ 6.67 × VOUT/VIN(MAX) MHz. At 2.5V input and 1.2V output, this yields ~3.2MHz practical maximum. Operation above 2.8MHz requires careful layout and low-ESR/ESL components to maintain stability and efficiency.
Does LTC3411AEDD#PBF support prebiased output startup?
Yes, the LTC3411AEDD#PBF explicitly supports prebiased output startup, allowing VOUT to be precharged up to 3V before enabling the regulator. During startup, the internal synchronous switches remain off until VFB reaches regulation, preventing reverse current flow and ensuring safe sequencing in multi-rail systems without external diodes or complex control logic.
What is the purpose of separate PVIN and SVIN pins on LTC3411AEDD#PBF?
The LTC3411AEDD#PBF uses separate PVIN (main power) and SVIN (signal power) pins to isolate high-current switching paths from sensitive analog circuitry. PVIN supplies the power MOSFETs and must be decoupled to PGND; SVIN powers the error amplifier, oscillators, and logic, requiring decoupling to SGND. SVIN must be ≥ PVIN to ensure proper gate drive and reference stability - a key design constraint verified in all application circuits.
How does the SYNC/MODE pin configure operating modes on LTC3411AEDD#PBF?
The SYNC/MODE pin on LTC3411AEDD#PBF selects three distinct low-load modes: tied to SVIN enables Burst Mode (40µA IQ); tied to SGND enables pulse skipping; biased at SVIN/2 enables forced continuous conduction. When driven by an external clock (0.4–4MHz), it synchronizes switching and defaults to pulse skip. This pin directly controls comparator thresholds in the burst clamp and oscillator logic - no external resistors or configuration registers are needed.
What thermal considerations apply to LTC3411AEDD#PBF in the 3mm × 3mm DFN package?
The LTC3411AEDD#PBF in the DD package has θJA = 43°C/W. With 1.25A output at 3.6V input/1.8V output, typical power dissipation is ~180mW, resulting in ~8°C rise above ambient. Full thermal performance requires soldering the exposed PGND pad (Pin 11) to a minimum 100mm² internal or external copper plane. Derating is recommended above 85°C ambient; junction temperature must not exceed 125°C, enforced by internal thermal shutdown.
LTC3411AEDD#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 10-WFDFN Exposed Pad
- Packaging:
- Tube
- 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)
LTC3411AEDD#PBF FAQ
1.How can I place an order for LTC3411AEDD#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3411AEDD#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 LTC3411AEDD#PBF reliable?
The price and inventory of LTC3411AEDD#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3411AEDD#PBF is usually 5 days.
3.What payment methods are accepted for LTC3411AEDD#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3411AEDD#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3411AEDD#PBF?
LTC3411AEDD#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3411AEDD#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 LTC3411AEDD#PBF?
For technical support, including LTC3411AEDD#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3411AEDD#PBF requirements.
6.How does Aetrix verify that LTC3411AEDD#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3411AEDD#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 LTC3411AEDD#PBF meets industry standards.
7.What is the process for return or replacement of LTC3411AEDD#PBF?
All LTC3411AEDD#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3411AEDD#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 LTC3411AEDD#PBF part is unused and in its original packaging.
Return procedure for LTC3411AEDD#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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