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Analog Devices Inc. LTC3411AIDD#PBF
- Part No.:
- LTC3411AIDD#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
LTC3411AIDD#PBF.pdf
- Description:
- IC REG BUCK ADJ 1.25A 10DFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,783
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Product details
Overview
LTC3411AIDD#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 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, or pulse-skip operation and is used in space-constrained portable power rails for digital cameras and cellular phones.
For engineers reviewing the LTC3411AIDD#PBF datasheet, LTC3411AIDD#PBF pinout, LTC3411AIDD#PBF application, or LTC3411AIDD#PBF equivalent, key selection factors include its 4MHz max switching frequency enabling sub-1mm-height inductors, ±7% PGOOD accuracy, 0.8V feedback reference, 10-lead 3mm × 3mm DFN package with exposed PGND pad, and support for prebiased startup.
Technical Context
The LTC3411AIDD#PBF uses a constant-frequency current-mode control architecture with external RT resistor or SYNC clock synchronization. Its error amplifier drives the ITH pin to regulate peak inductor current, while independent overvoltage/undervoltage comparators monitor VFB against 0.8V reference to assert PGOOD within ±7% window.
Three low-load operating modes are selected via SYNC/MODE pin voltage: Burst Mode (IQ = 40µA) for highest light-load efficiency, pulse skipping for reduced ripple, and forced continuous for fixed-frequency noise control. In dropout, the P-channel MOSFET operates at 100% duty cycle with no reverse current protection.
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 resistor divider; 0.8V reference enables core voltage regulation down to sub-1V logic domains. |
| Max Switching Frequency | 4MHz - allows use of 1.0–2.2µH inductors ≤1mm height and ceramic capacitors <22µF for ultra-compact PCB layouts. |
| Peak Output Current | 1.25A - sustained delivery with thermal derating; peak switch current limit is 1.6–2.6A depending on temperature. |
| Feedback Reference Voltage | 0.8V ±2% - high-accuracy reference enables tight output regulation; load/line regulation ≤0.2% ensures stability across operating conditions. |
| Quiescent Current (Burst) | 40µA - enables >100-hour battery life in standby mode for handheld instruments and IoT sensors. |
| Shutdown Current | <1µA - minimizes system-level leakage during deep sleep or transport storage. |
| PGOOD Accuracy | ±7% - provides reliable power sequencing and fault detection without external monitoring circuitry. |
Pinout & Package
Package: 10-lead 3mm × 3mm plastic DFN 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 regulator; resistor to GND sets fOSC from ~200kHz to 4MHz per RT = 5×10⁷·fO−1.6508 kΩ. |
| SYNC/MODE (2) | Mode selection & external sync input | Voltage level selects Burst (SVIN), pulse skip (SGND), or forced continuous (~0.5×SVIN); accepts external clock up to 4MHz. |
| SGND (3) | Signal ground reference | Reference for VFB, ITH, PGOOD; must be isolated from PGND except at single-point star connection to minimize noise coupling. |
| SW (4) | Switch node | Connects to inductor; swings between PVIN and PGND; requires low-inductance layout to suppress ringing and EMI. |
| PGND (5) | Main power ground | Return path for COUT, CIN, and exposed pad; must be solid copper pour tied directly to exposed PGND pad. |
| PVIN (6) | Main power input | High-current input for power switches; requires local 1–10µF ceramic decoupling to PGND. |
| SVIN (7) | Signal power supply | Bias for internal analog circuitry; must be ≥PVIN and decoupled to SGND with 0.1–1µF ceramic capacitor. |
| PGOOD (8) | Open-drain power-good indicator | Pulled low when VOUT deviates >±7% from target; 15–30Ω pull-down resistance enables direct interface to µC reset or PMIC sequencing. |
| VFB (9) | Feedback input | Compares divided VOUT to 0.8V reference; ±0.1µA input bias enables high-impedance dividers without gain error. |
| ITH (10) | Error amplifier output & current limit control | Voltage controls peak inductor current; nominal range 0.4–1.4V; external compensation network connects here for loop stability. |
Key Features
| Feature | Design Value |
|---|---|
| Internal Synchronous Power Switches | 0.15Ω P-ch and 0.13Ω N-ch MOSFETs eliminate external diode, enabling >96% peak efficiency and reducing thermal footprint. |
| Selectable Low-Ripple Burst Mode | 40µA quiescent current with 25mVP-P output ripple preserves battery life while maintaining clean power for RF and audio subsystems. |
| Stable with Ceramic Output Capacitors | No ESR dependency in control loop allows use of low-ESR, high-reliability MLCCs instead of electrolytics-reducing size, cost, and aging drift. |
| Prebiased Output Startup Support | Enables safe start-up into precharged VOUT without reverse current flow-critical for hot-swap and multi-rail sequencing applications. |
| 100% Duty Cycle Dropout Operation | Maintains regulation as VIN approaches VOUT by fully enhancing P-ch MOSFET-eliminates need for external bypass path in low-VIN scenarios. |
| Short-Circuit Protected | Current-limit foldback and thermal shutdown prevent damage during output shorts or excessive load transients. |
Applications
| Mobile Baseband Processor Power | Digital Camera Core Rail |
|---|---|
Use Scenario: Supplying 1.2V/1.0A core voltage to an ARM-based baseband processor in a cellular handset during active call and idle states. IC Role / Device Role / Timing Role: Primary buck regulator delivering tightly regulated core voltage with fast transient response to CPU load steps. Use Value: Burst Mode extends talk time by minimizing IQ during idle; 4MHz operation enables 1.2µH inductor and 10µF ceramic output cap in <30mm² footprint. | Use Scenario: Generating 1.8V/1.25A for image sensor and ISP in a compact digital camera module with strict height constraints. IC Role / Device Role / Timing Role: High-frequency synchronous buck converter powering noise-sensitive analog front-end and digital logic blocks. Use Value: Forced continuous mode ensures fixed 1MHz switching frequency for predictable EMI filtering; 0.8V reference enables precise 1.8V setting via standard 1% resistors. |
| Handheld Medical Instrument | Industrial IoT Sensor Node |
Use Scenario: Providing 3.3V/0.8A to microcontroller, display driver, and analog signal chain in a battery-powered portable ECG device. IC Role / Device Role / Timing Role: Main system power regulator supporting both active measurement and low-power sleep modes. Use Value: <1µA shutdown current prevents battery drain during storage; PGOOD signal validates rail integrity before initiating measurement sequence. | Use Scenario: Delivering 2.5V/0.5A to ultra-low-power MCU, LoRa transceiver, and environmental sensors in a sealed industrial wireless node. IC Role / Device Role / Timing Role: Efficient point-of-load converter optimized for intermittent transmit bursts and long sleep intervals. Use Value: 40µA Burst Mode IQ enables >2-year battery life on two AA cells; prebias support allows seamless wake-from-sleep without output droop. |
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 | 3.0V–17V input, 3A output, fixed 3.3V/5V options only; no adjustable VFB; 2.5MHz max fSW. | Requires external resistor divider for non-standard outputs; less suitable for sub-3V input or fine-tuned core voltages. | Choose TPS62130ARGTR when higher input voltage range and fixed-output simplicity outweigh need for 0.8V adjustability and 4MHz density. |
| MP2143GJ-Z | 2.5V–5.5V input, 1.2A output, 0.8V reference, but only 2.2MHz max fSW; no PGOOD or prebias support. | Lacks power-good signaling and precharged startup capability-limits use in sequenced or hot-plug systems. | Choose MP2143GJ-Z where cost sensitivity dominates and PGOOD/prebias are not required in the BOM. |
Compared with TPS62130ARGTR and MP2143GJ-Z, the LTC3411AIDD#PBF offers the widest frequency range (up to 4MHz), full VFB adjustability, integrated PGOOD, and verified prebias operation-making it optimal for compact, multi-rail, battery-critical designs requiring design flexibility and robust sequencing.
Availability
LTC3411AIDD#PBF is available at Aetrix Electronics and suitable for notebook computers, digital cameras, and cellular phones requiring stable component supply with guaranteed long-term availability and traceable sourcing.
Supply support for LTC3411AIDD#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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving precision instrumentation, communications, and power management markets.
The LTC3411A series is designed for medium-power, high-frequency DC/DC conversion in space-constrained portable electronics, emphasizing efficiency across wide load ranges and robustness in dynamic voltage environments.
FAQ
What is the maximum supported switching frequency for the LTC3411AIDD#PBF?
The LTC3411AIDD#PBF supports up to 4MHz switching frequency, programmable via the RT resistor or external SYNC clock. This is guaranteed by design (not production-tested) and subject to duty-cycle limitations per fO(MAX) ≈ 6.67 × VOUT/VIN(MAX) MHz. At 2.5V input and 1.2V output, max usable frequency is ~3.2MHz. The LTC3411AIDD#PBF achieves this using a current-mode architecture with fast internal comparators and low-propagation-delay gate drivers.
Does the LTC3411AIDD#PBF support startup into a precharged output?
Yes, the LTC3411AIDD#PBF supports prebiased output startup. When VOUT is precharged, the internal reverse-current comparator prevents the bottom switch from turning on, avoiding destructive reverse current flow. This behavior is confirmed in the datasheet's "Start-Up from Shutdown with a Prebiased Output" waveform (Figure G22) and is enabled by default-no external components or configuration are required. The LTC3411AIDD#PBF maintains this capability across all MODE selections.
What is the purpose of the separate PVIN and SVIN pins on the LTC3411AIDD#PBF?
PVIN supplies high-current power to the internal P-channel and N-channel MOSFETs, while SVIN powers the analog control circuitry (error amplifier, oscillators, comparators). SVIN must be ≥ PVIN and is decoupled separately to SGND to isolate noise-sensitive analog references from power-switching transients. This separation improves PSRR and ensures stable regulation under high di/dt load steps. The LTC3411AIDD#PBF specifies distinct absolute max ratings and thermal paths for each supply domain.
How does the PGOOD pin on the LTC3411AIDD#PBF behave during output overvoltage or undervoltage events?
The PGOOD pin on the LTC3411AIDD#PBF is an open-drain output that pulls low when VFB deviates >±7% from 0.8V-corresponding to VOUT outside (0.92×VSET) to (1.07×VSET). It includes 40µs blanking after startup and 105µs unblinking delay to reject transient spikes. The pull-down resistance is 15–30Ω, enabling direct connection to µC reset inputs or FPGA power-good monitors without external pull-ups. This behavior is fully characterized in the Electrical Characteristics table under "PGOOD Threshold".
Can the LTC3411AIDD#PBF operate with ceramic input and output capacitors exclusively?
Yes, the LTC3411AIDD#PBF is explicitly designed to be stable with ceramic capacitors only. Its current-mode control loop does not rely on output capacitor ESR for phase margin, eliminating the need for aluminum or tantalum caps. The datasheet recommends 0.1–1µF ceramic near VIN and 10–22µF ceramic for COUT, with ESR × COUT < 150mΩ to meet ripple targets. This reduces board area, improves reliability, and avoids aging-related capacitance loss seen in electrolytics.
LTC3411AIDD#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)
LTC3411AIDD#PBF FAQ
1.How can I place an order for LTC3411AIDD#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3411AIDD#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 LTC3411AIDD#PBF reliable?
The price and inventory of LTC3411AIDD#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3411AIDD#PBF is usually 5 days.
3.What payment methods are accepted for LTC3411AIDD#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3411AIDD#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3411AIDD#PBF?
LTC3411AIDD#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3411AIDD#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 LTC3411AIDD#PBF?
For technical support, including LTC3411AIDD#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3411AIDD#PBF requirements.
6.How does Aetrix verify that LTC3411AIDD#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3411AIDD#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 LTC3411AIDD#PBF meets industry standards.
7.What is the process for return or replacement of LTC3411AIDD#PBF?
All LTC3411AIDD#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3411AIDD#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 LTC3411AIDD#PBF part is unused and in its original packaging.
Return procedure for LTC3411AIDD#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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