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Analog Devices Inc. LTC3412IFE#PBF
- Part No.:
- LTC3412IFE#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LTC3412IFE#PBF.pdf
- Description:
- IC REG BUCK ADJ 2.5A 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:443
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Product details
Overview
LTC3412IFE#PBF from Analog Devices (formerly Linear Technology) is a 2.5A, 4MHz monolithic synchronous step-down DC/DC regulator with current-mode control, operating from 2.625V to 5.5V input and delivering adjustable 0.8V–5V output. It integrates 85mΩ P-channel and 65mΩ N-channel MOSFETs, supports Burst Mode® or forced continuous operation, and features OPTI-LOOP® compensation for optimized transient response in portable power systems.
For engineers reviewing the LTC3412IFE#PBF datasheet, LTC3412IFE#PBF pinout, LTC3412IFE#PBF application, or LTC3412IFE#PBF equivalent, key selection considerations include its 16-lead TSSOP thermal package, 62µA quiescent current in Burst Mode, ±2% output voltage accuracy, 100% duty cycle low-dropout capability, and programmable switching frequency from 300kHz to 4MHz.
Technical Context
The LTC3412IFE#PBF implements constant-frequency current-mode control with dual internal MOSFETs (P-ch and N-ch), where peak inductor current is regulated via the ITH pin voltage and error amplifier feedback against a 0.8V reference. Its OPTI-LOOP® architecture dynamically adjusts compensation to maintain stability across wide output capacitor and load variations.
Switching frequency is set by an external resistor on the RT pin or synchronized externally via the SYNC/MODE pin (300kHz–4MHz range). The device supports three operational modes: forced continuous (low-noise), Burst Mode® (high-efficiency at light loads with adjustable burst clamp), and pulse-skipping (via grounded SYNC/MODE), all with integrated overtemperature protection and power-good monitoring.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 2.5A max - supports high-current point-of-load conversion in space-constrained portable systems. |
| Input Voltage Range | 2.625V to 5.5V - compatible with single-cell Li-ion, Li-polymer, and 3.3V/5V rail inputs. |
| Output Voltage Range | 0.8V to 5V adjustable - enables core voltage regulation for processors, FPGAs, and ASICs. |
| Switching Frequency | 300kHz to 4MHz - allows trade-off between small external components (high-freq) and efficiency (low-freq). |
| Quiescent Current | 62µA in Burst Mode - extends battery runtime in always-on or low-duty-cycle applications. |
| RDS(ON) (P-FET / N-FET) | 85mΩ / 65mΩ - minimizes conduction loss and eliminates need for external Schottky diode. |
| Feedback Reference | 0.800V ±2% - enables precise low-output-voltage regulation with minimal divider error. |
| Power Good Accuracy | ±7.5% window - provides reliable system-level power sequencing and fault detection. |
Pinout & Package
The LTC3412IFE#PBF is housed in a 16-lead thermally enhanced plastic TSSOP package (FE grade) with exposed pad (Pin 17) soldered to SGND for electrical integrity and thermal performance (θJA = 37.6°C/W). Pin numbering follows standard top-view orientation with dual-source pins for PVIN, SW, and PGND to reduce parasitic inductance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SVIN (1, 11) | Signal Input Supply | Decoupled separately from PVIN; must stay within 0.5V of PVIN to avoid overstress. |
| PGOOD (2, 12) | Open-Drain Power-Good Monitor | Pulled low when VOUT deviates >±7.5%; requires external pull-up for logic interface. |
| ITH (3, 13) | Error Amplifier Compensation Node | Voltage-controlled current limit threshold (0.2V–1.4V); critical for loop stability and transient response. |
| VFB (4, 14) | Feedback Input | Connects to resistive divider; regulates output by comparing to 0.8V internal reference. |
| RT (5, 15) | Oscillator Timing Resistor Input | Sets switching frequency via external resistor (e.g., 309kΩ → ~1MHz); enables sync or free-running mode. |
| SYNC/MODE (6, 16) | Mode Control & Clock Sync Input | Tied to SVIN → forced continuous; 0–1V → adjustable Burst Mode; external clock → synchronization. |
| RUN/SS (7, 1) | Enable & Soft-Start Control | <0.5V disables IC; capacitor to ground sets soft-start ramp time and prevents inrush. |
| SGND (8, 2) | Signal Ground Reference | Reference for all analog circuitry and compensation components; connects to PGND at single point. |
| PVIN (9, 16) | Main Power Input | High-current input node; requires local low-ESR ceramic decoupling to PGND. |
| SW (10, 11, 14, 15) | Switch Node | Connection point for external inductor; carries high dv/dt and high di/dt; layout critical for EMI. |
| PGND (12, 13) | Power Ground Return | Low-impedance return path for input/output capacitors and MOSFET sources; ties to PCB ground plane. |
| Exposed Pad (17) | Thermal & Electrical Ground | Mandatory solder connection to SGND plane; essential for thermal dissipation and noise immunity. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Synchronous Power Switches | Eliminates external Schottky diode, reduces conduction loss, and improves full-load efficiency up to 95%. |
| Burst Mode® with Adjustable Clamp | Enables user-defined minimum inductor current (0–3.75A) to balance output ripple vs. light-load efficiency. |
| OPTI-LOOP® Compensation | Automatically adapts loop gain to maintain phase margin across varying output capacitance and load conditions. |
| 100% Duty Cycle Low-Dropout Operation | Extends usable battery life by sustaining regulation as input voltage approaches output voltage. |
| Programmable Switching Frequency | Supports EMI-sensitive designs (lower freq) or compact layouts (higher freq up to 4MHz). |
| Robust Protection Suite | Includes overtemperature shutdown, short-circuit current limiting (4.8A valley limit), and undervoltage lockout (2.5V threshold). |
Applications
| Portable Instruments | Battery-Powered Equipment |
|---|---|
Use Scenario: Handheld multimeters, portable oscilloscopes, and field test equipment powered by single-cell Li-ion batteries. IC Role / Device Role / Timing Role: Primary step-down regulator converting 3.7V nominal battery voltage to stable 1.8V/3.3V rails for microcontrollers and analog front-ends. Use Value: 62µA quiescent current in Burst Mode extends battery life during standby; 100% duty cycle maintains regulation down to 2.8V input. |
Use Scenario: Wireless sensors, Bluetooth beacons, and IoT edge nodes requiring long-term operation on coin cells or small Li-poly packs. IC Role / Device Role / Timing Role: High-efficiency power manager supplying variable 1.2V–3.3V outputs to RF transceivers and ultra-low-power MCUs. Use Value: Adjustable burst clamp allows tuning of output ripple to match sensor ADC resolution requirements without sacrificing efficiency. |
| Notebook Computers | Distributed Power Systems |
Use Scenario: Sub-5V auxiliary rails (e.g., DDR memory termination, display backlight bias, USB-C PD companion supplies) in thin-and-light notebooks. IC Role / Device Role / Timing Role: Compact, high-frequency (≥2MHz) point-of-load converter minimizing inductor size and board area. Use Value: 4MHz capability enables use of 0.47µH inductors and 22µF ceramic output caps-reducing solution footprint by >40% vs. 500kHz alternatives. |
Use Scenario: Intermediate bus converters in industrial PLCs or telecom line cards distributing 5V/3.3V from 12V backplane rails. IC Role / Device Role / Timing Role: Robust, thermally efficient secondary regulator handling dynamic load steps up to 2.5A with fast transient recovery. Use Value: OPTI-LOOP® ensures stable operation with diverse output capacitor types (polymer, tantalum, ceramic), simplifying BOM management. |
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 |
|---|---|---|---|
| TPS62864DLCR | Lower 0.6V reference, 4A rating, fixed 2.4MHz frequency; no Burst Mode clamp adjustment; smaller 1.5mm × 1.5mm QFN. | Better suited for higher-current, space-constrained apps where fixed frequency simplifies EMI filtering. | Select if needing >2.5A output or smallest possible footprint; avoid if adjustable burst clamp or 100% dropout is required. |
| MP2315GJ-Z | 3A rating, 2.2MHz fixed frequency, 3.3–18V input, no SYNC/MODE pin, no PGOOD, simpler feature set. | Targeted at cost-sensitive industrial and consumer power rails where advanced control features are unnecessary. | Choose for non-battery applications with wider input range and lower BOM cost; not suitable for precision low-VOUT or battery longevity optimization. |
Compared with TPS62864DLCR and MP2315GJ-Z, the LTC3412IFE#PBF offers unique flexibility in burst clamp tuning, 100% duty cycle operation, and OPTI-LOOP® adaptive compensation-making it optimal for battery-powered systems demanding both efficiency and dynamic load stability.
Availability
LTC3412IFE#PBF is available at Aetrix Electronics and suitable for portable instruments, battery-powered equipment, and notebook computers requiring stable component supply with guaranteed long-term availability and consistent parametric performance.
Supply support for LTC3412IFE#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. (ADI) is a global leader in high-performance analog, mixed-signal, and power management semiconductors, formed through the acquisition of Linear Technology in 2017.
The LTC3412IFE#PBF belongs to ADI's Power by Linear™ family of high-efficiency DC/DC regulators, engineered specifically for portable, battery-critical, and thermally constrained applications demanding precision regulation and ultra-low quiescent current.
FAQ
What is the maximum output current capability of the LTC3412IFE#PBF?
The LTC3412IFE#PBF delivers up to 2.5A of continuous output current under typical thermal conditions with proper PCB layout and heatsinking. Its internal 85mΩ P-channel and 65mΩ N-channel MOSFETs enable this performance without external diodes. Derating applies at elevated ambient temperatures or with inadequate copper area on the exposed pad; full 2.5A is validated at TA ≤ 85°C with recommended layout per the datasheet.
Does the LTC3412IFE#PBF support synchronization to an external clock?
Yes, the LTC3412IFE#PBF supports external clock synchronization via the SYNC/MODE pin (Pin 6/Pin 16). When driven by a clean CMOS clock signal between 300kHz and 4MHz, the internal oscillator locks to the external frequency. During sync, the burst clamp is automatically set to 0V, and each switching cycle begins at the falling edge of the external clock-enabling deterministic timing for noise-sensitive systems.
How does the Burst Mode® operation of the LTC3412IFE#PBF improve battery life?
The LTC3412IFE#PBF achieves 62µA quiescent current in Burst Mode® by disabling most internal circuitry-including the top and bottom MOSFETs-during light-load sleep periods. Output voltage is maintained solely by the output capacitor until regulation error triggers wake-up. This eliminates switching and gate drive losses, significantly extending runtime in standby or intermittent-use battery applications compared to forced continuous mode.
What is the purpose of the OPTI-LOOP® compensation in the LTC3412IFE#PBF?
OPTI-LOOP® compensation in the LTC3412IFE#PBF dynamically adjusts the error amplifier's gain and phase response based on output capacitor ESR and load conditions. Unlike fixed-compensation regulators, it maintains optimal phase margin across wide variations in capacitor type (ceramic, polymer, tantalum) and value-ensuring stable regulation and fast transient recovery without manual loop tuning or external component changes.
Can the LTC3412IFE#PBF operate with input voltage equal to the output voltage?
Yes, the LTC3412IFE#PBF supports true 100% duty cycle operation, allowing it to maintain regulation even when the input voltage drops to within the RDS(ON) × IOUT drop above the output voltage. For example, with 2.5A load and 85mΩ P-FET, it sustains regulation down to VIN ≈ VOUT + 0.21V-critical for maximizing usable battery capacity in single-cell Li-ion systems.
LTC3412IFE#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):
- 2.625V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 0.8V
- Voltage - Output (Max):
- 5V
- Current - Output:
- 2.5A
- Frequency - Switching:
- 300kHz ~ 4MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-TSSOP-EP
LTC3412IFE#PBF FAQ
1.How can I place an order for LTC3412IFE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3412IFE#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 LTC3412IFE#PBF reliable?
The price and inventory of LTC3412IFE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3412IFE#PBF is usually 5 days.
3.What payment methods are accepted for LTC3412IFE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3412IFE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3412IFE#PBF?
LTC3412IFE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3412IFE#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 LTC3412IFE#PBF?
For technical support, including LTC3412IFE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3412IFE#PBF requirements.
6.How does Aetrix verify that LTC3412IFE#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3412IFE#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 LTC3412IFE#PBF meets industry standards.
7.What is the process for return or replacement of LTC3412IFE#PBF?
All LTC3412IFE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3412IFE#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 LTC3412IFE#PBF part is unused and in its original packaging.
Return procedure for LTC3412IFE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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