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Analog Devices Inc. LTC3412AEFE#PBF
- Part No.:
- LTC3412AEFE#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LTC3412AEFE#PBF.pdf
- Description:
- IC REG BUCK ADJ 3A 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,032
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Product details
Overview
LTC3412AEFE#PBF from Analog Devices is a 3A, 4MHz monolithic synchronous step-down DC/DC regulator with current-mode control, operating from 2.25V to 5.5V input and delivering 0.8V–5V output. It integrates 77mΩ P-channel and 65mΩ N-channel MOSFETs, supports programmable frequency (300kHz–4MHz), and delivers up to 95% efficiency in notebook computer point-of-load applications.
For engineers reviewing the LTC3412AEFE#PBF datasheet, LTC3412AEFE#PBF pinout, LTC3412AEFE#PBF application, or LTC3412AEFE#PBF equivalent, key selection considerations include its 16-lead TSSOP exposed-pad package, ±2% output voltage accuracy, selectable Burst Mode® or forced continuous operation, 64µA quiescent current, and power-good monitoring for system sequencing.
Technical Context
The LTC3412AEFE#PBF employs constant-frequency current-mode architecture with OPTI-LOOP® compensation, enabling stable transient response across wide load and output capacitance ranges. Its dual-MOSFET synchronous rectification eliminates external Schottky diode losses, while internal slope compensation recovery maintains peak inductor current consistency above 40% duty cycle.
Operation supports three modes via SYNC/MODE pin: forced continuous (tied to SVIN), adjustable Burst Mode® (0V–1V clamp), or pulse-skipping (grounded). Frequency is set by RT pin resistor or synchronized externally (300kHz–4MHz), and 100% duty-cycle low-dropout operation extends battery runtime in portable systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 3A maximum continuous - supports high-current PoL rails in compact space-constrained designs. |
| Input Voltage Range | 2.25V to 5.5V - compatible with single-cell Li-ion, USB, and intermediate bus supplies. |
| Switching Frequency | 300kHz to 4MHz - enables small inductors/capacitors (e.g., 0.47µH at 1MHz) without sacrificing efficiency. |
| Feedback Reference | 0.8V ±2% - allows precise low-voltage outputs (e.g., 0.8V core rails) with minimal divider error. |
| Quiescent Current | 64µA in Burst Mode - extends battery life in always-on subsystems without compromising wake-up speed. |
| RDS(ON) | 77mΩ (P-FET) / 65mΩ (N-FET) - reduces conduction loss at full load; enables >90% efficiency at 1A–3A loads. |
| Power Good Output | Open-drain, ±7.5% window - provides reliable system-level power sequencing and fault detection. |
Pinout & Package
The LTC3412AEFE#PBF is housed in a 16-lead plastic TSSOP with exposed pad (FE package), rated for –40°C to 125°C junction temperature. Thermal resistance θJA = 38°C/W; exposed pad (Pin 17) must be soldered to SGND for electrical integrity and thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SVIN (1,11) | Signal Input Supply | Provides bias for control circuitry; decoupled separately from PVIN to minimize noise coupling into feedback loop. |
| PGOOD (2,12) | Power-Good Monitor | Open-drain output asserts low when VOUT deviates >±7.5% - used for processor reset or downstream enable sequencing. |
| ITH (3,13) | Error Amplifier Compensation | Controls peak current limit threshold; voltage range 0.2V–1.4V sets dynamic current limit and loop stability margin. |
| VFB (4,14) | Feedback Input | Compares resistive-divider output against 0.8V reference; determines regulated output voltage with ±2% accuracy. |
| RT (5,15) | Oscillator Timing | Resistor-to-ground sets switching frequency (ROSC = 3.08×10¹¹/f); enables precise EMI control and layout optimization. |
| SYNC/MODE (6,16) | Mode Control & Sync Input | Selects Burst Mode® clamp level (0–1V), forces continuous mode (tied to SVIN), or enables external clock sync (300kHz–4MHz). |
| RUN/SS (7,1) | Enable & Soft-Start | Shuts down IC below 0.5V; capacitor to ground controls output ramp time and inrush current limiting. |
| SGND (8,2) | Signal Ground | Reference for all analog circuitry and compensation components; connects to PGND at single point to avoid ground loops. |
| PVIN (9,16; 3,10) | Power Input Supply | High-current VIN path; requires local low-ESR ceramic decoupling near pins to suppress switching transients. |
| SW (10,11,14,15; 4,5,8,9) | Switch Node | Drain connection of internal P/N-FETs; routes high di/dt current to external inductor - critical for EMI and layout integrity. |
| PGND (12,13; 6,7) | Power Ground | Return path for high-current switch and output capacitor; must be low-inductance connection to CIN/COUT negative terminals. |
Key Features
| Feature | Design Value |
|---|---|
| OPTI-LOOP® Compensation | Allows external RC network on ITH pin to optimize transient response across varying output capacitance and load conditions - no re-tuning needed for different capacitor types. |
| Selectably Adjustable Burst Clamp | SYNC/MODE pin voltage (0–1V) directly sets minimum inductor peak current during light-load bursts - enables trade-off between output ripple and efficiency. |
| Synchronous Dual-MOSFET Architecture | Integrated 77mΩ P-FET and 65mΩ N-FET eliminate external Schottky diode, reducing BOM count and conduction losses - improves full-load efficiency by ~3–5% vs. asynchronous designs. |
| 100% Duty-Cycle Low-Dropout Operation | Enables regulation down to VOUT ≈ VIN − (IOUT × RDS(ON)) - sustains output during brownout or battery sag without dropout reset. |
| Internal Slope Compensation Recovery | Maintains constant maximum inductor peak current across duty cycles >40%, preventing subharmonic oscillation while preserving full 3A output capability at high VOUT/VIN ratios. |
Applications
| Point-of-Load Regulation | Notebook Computers |
|---|---|
Use Scenario: Regulating 2.5V/3A CPU I/O rail from 3.3V intermediate bus in ultra-thin clamshell design. IC Role / Device Role / Timing Role: Primary synchronous buck controller managing dynamic load steps up to 2A/µs with <50mV undershoot. Use Value: 95% peak efficiency and 64µA quiescent current extend battery runtime while maintaining tight ±2% output accuracy under variable load. | Use Scenario: Powering DDR memory subsystem requiring fast transient response and low-noise 1.2V supply. IC Role / Device Role / Timing Role: High-frequency (2MHz) step-down regulator with forced continuous mode to suppress switching harmonics near RF bands. Use Value: Programmable frequency avoids interference with Wi-Fi/Bluetooth bands; PGOOD signal coordinates memory initialization sequence. |
| Portable Instruments | Distributed Power Systems |
Use Scenario: Supplying 3.3V/2A analog front-end in handheld multimeter with coin-cell backup. IC Role / Device Role / Timing Role: Main DC/DC converter operating in Burst Mode® to maintain µA-level sleep current while supporting instant wake-up. Use Value: 64µA IQ enables >1-year shelf life on primary battery; 100% duty-cycle operation sustains output during battery voltage decay to 3.3V. | Use Scenario: Generating isolated 5V/1A auxiliary rail from 12V backplane in industrial PLC module. IC Role / Device Role / Timing Role: Non-isolated buck stage preceding isolated DC/DC; synchronized to system clock to reduce EMI coupling. Use Value: External frequency sync (1MHz) aligns switching edges across multiple regulators - simplifies EMI filter design and meets CISPR-32 Class B limits. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS54332DR | 3A, 28V max input, fixed 500kHz freq, 115mΩ/100mΩ FETs, no Burst Mode®, higher IQ (220µA) | Higher input voltage range suits 12V/24V industrial inputs; lacks adjustable light-load mode - less suitable for battery-powered devices | Choose for cost-sensitive 12V-input applications where efficiency at light load is secondary to BOM simplicity. |
| MP2332HGTL-Z | 3A, 5.5V max input, 500kHz–2.2MHz freq, 60mΩ/40mΩ FETs, proprietary auto-mode (not user-adjustable), 30µA IQ | Lower RDS(ON) improves full-load efficiency; auto-mode lacks external burst clamp control - ripple not tunable | Choose when lowest possible quiescent current and highest full-load efficiency are prioritized over ripple adjustability. |
Compared with TPS54332DR and MP2332HGTL-Z, the LTC3412AEFE#PBF uniquely offers user-adjustable Burst Mode® clamp, 4MHz max frequency for ultra-compact designs, and OPTI-LOOP® compensation - making it optimal for high-performance portable and instrumentation applications demanding both efficiency and precision.
Availability
LTC3412AEFE#PBF is available at Aetrix Electronics and suitable for point-of-load regulation, notebook computers, portable instruments, and distributed power systems requiring stable component supply, long-term lifecycle support, and guaranteed parametric performance across –40°C to 125°C.
Supply support for LTC3412AEFE#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 LTC3412AEFE#PBF belongs to the LTC® monolithic DC/DC converter product line, engineered for high-efficiency, high-density power conversion in space- and battery-constrained applications such as portable computing and test equipment.
FAQ
What is the maximum supported switching frequency for the LTC3412AEFE#PBF?
The LTC3412AEFE#PBF supports a programmable switching frequency range of 300kHz to 4MHz, set via an external resistor on the RT pin. While 4MHz operation is guaranteed by design (not production-tested), typical performance data confirms stable regulation and >90% efficiency at 4MHz with appropriate layout and component selection.
Does the LTC3412AEFE#PBF require an external Schottky diode?
No, the LTC3412AEFE#PBF does not require an external Schottky diode. It integrates synchronous P-channel and N-channel MOSFETs (77mΩ and 65mΩ RDS(ON), respectively) to replace the freewheeling diode, eliminating conduction losses and improving efficiency by 3–5% compared to asynchronous buck converters.
How is Burst Mode® operation configured on the LTC3412AEFE#PBF?
Burst Mode® operation on the LTC3412AEFE#PBF is enabled by applying a DC voltage between 0V and 1V to the SYNC/MODE pin. This voltage sets the burst clamp level, directly controlling the minimum inductor peak current during light-load bursts - allowing designers to tune output voltage ripple versus efficiency trade-offs.
What thermal considerations apply to the LTC3412AEFE#PBF in TSSOP package?
The LTC3412AEFE#PBF in FE-package TSSOP has θJA = 38°C/W. To maintain TJ ≤ 125°C, PCB layout must solder the exposed pad (Pin 17) to a solid SGND plane with ≥4 thermal vias. At 3A load and 3.3V input, power dissipation is ~350mW - requiring ≥2 cm² copper area for safe operation without airflow.
Can the LTC3412AEFE#PBF operate with 100% duty cycle, and what is its significance?
Yes, the LTC3412AEFE#PBF supports 100% duty cycle operation, enabling regulation when input voltage approaches output voltage (e.g., 3.3V → 3.0V). This low-dropout behavior sustains output during battery discharge or input brownout, avoiding system reset - critical for portable and instrumentation applications relying on uninterrupted power.
LTC3412AEFE#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-TSSOP (0.173", 4.40mm Width) 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):
- 2.25V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 0.8V
- Voltage - Output (Max):
- 5V
- Current - Output:
- 3A
- Frequency - Switching:
- 300kHz ~ 4MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-TSSOP-EP
LTC3412AEFE#PBF FAQ
1.How can I place an order for LTC3412AEFE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3412AEFE#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 LTC3412AEFE#PBF reliable?
The price and inventory of LTC3412AEFE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3412AEFE#PBF is usually 5 days.
3.What payment methods are accepted for LTC3412AEFE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3412AEFE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3412AEFE#PBF?
LTC3412AEFE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3412AEFE#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 LTC3412AEFE#PBF?
For technical support, including LTC3412AEFE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3412AEFE#PBF requirements.
6.How does Aetrix verify that LTC3412AEFE#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3412AEFE#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 LTC3412AEFE#PBF meets industry standards.
7.What is the process for return or replacement of LTC3412AEFE#PBF?
All LTC3412AEFE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3412AEFE#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 LTC3412AEFE#PBF part is unused and in its original packaging.
Return procedure for LTC3412AEFE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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