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Analog Devices Inc. LTC3412EUF#TRPBF
- Part No.:
- LTC3412EUF#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-WQFN Exposed Pad
- Datasheet:
-
LTC3412EUF#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 2.5A 16QFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,250
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Product details
Overview
LTC3412EUF#TRPBF from Analog Devices (formerly Linear Technology) is a monolithic synchronous step-down DC/DC regulator delivering up to 2.5A at adjustable output voltages from 0.8V to 5V, operating from 2.625V–5.5V input. It integrates 85mΩ P-channel and 65mΩ N-channel MOSFETs, supports 300kHz–4MHz programmable switching frequency, and features OPTI-LOOP® compensation for optimized transient response in portable power systems.
For engineers reviewing the LTC3412EUF#TRPBF datasheet, LTC3412EUF#TRPBF pinout, LTC3412EUF#TRPBF application, or LTC3412EUF#TRPBF equivalent, key selection considerations include its 16-pin 4mm × 4mm QFN package with exposed thermal pad, selectable Burst Mode®/forced continuous operation, ±2% output voltage accuracy, 62µA quiescent current in sleep mode, and 100% duty cycle low-dropout capability for battery longevity.
Technical Context
The LTC3412EUF#TRPBF employs constant-frequency current-mode control with internal slope compensation to prevent subharmonic oscillation above 40% duty cycle. Its dual-MOSFET architecture enables synchronous rectification without external diodes, while the ITH pin provides direct control of peak inductor current via error amplifier output voltage (0.2V–1.4V range).
Switching frequency is set by an external resistor on RT or synchronized externally via SYNC/MODE pin (300kHz–4MHz). The device implements adaptive burst clamp programming through SYNC/MODE voltage (0V–1V), enabling precise control of minimum inductor current and output ripple during light-load operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.625V to 5.5V - supports single-cell Li-ion, Li-polymer, and dual-cell alkaline/NiMH battery inputs. |
| Output Current | Up to 2.5A - sufficient for powering core logic, FPGAs, or RF subsystems in space-constrained portable designs. |
| Output Voltage Accuracy | ±2% over line/load/temperature - ensures stable regulation for sensitive analog and digital loads. |
| Quiescent Current | 62µA in Burst Mode sleep - extends battery runtime in always-on or low-duty-cycle IoT sensor nodes. |
| Switch RDS(ON) | P-FET: 85mΩ, N-FET: 65mΩ - minimizes conduction loss and enables >95% peak efficiency at 2.5A. |
| Switching Frequency | Programmable 300kHz–4MHz - allows trade-off between small passive size (high-freq) and high efficiency (low-freq). |
| Power Good Output | Open-drain PGOOD with ±7.5% threshold - provides reliable system-level power sequencing and fault monitoring. |
Pinout & Package
Package: 16-lead (4mm × 4mm) plastic QFN with exposed thermal pad (Pin 17 = SGND), rated for –40°C to 125°C junction temperature, θJA = 34°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SVIN (Pin 1 / Pin 11) | Signal Input Supply | Decoupled supply for control circuitry; must be within 0.5V of PVIN to avoid overstress. |
| PGOOD (Pin 2 / Pin 12) | Power Good Monitor | Open-drain output pulled low if VOUT deviates >±7.5%; used for system enable/disable sequencing. |
| ITH (Pin 3 / Pin 13) | Error Amplifier Compensation | Controls peak inductor current; nominal 0.2V–1.4V range directly sets current limit threshold. |
| VFB (Pin 4 / Pin 14) | Feedback Input | Monitors resistive divider output; references internal 0.8V bandgap for output voltage regulation. |
| RT (Pin 5 / Pin 15) | Oscillator Timing | Resistor-to-ground sets switching frequency; 309kΩ yields ~1MHz per datasheet Figure 1. |
| SYNC/MODE (Pin 6 / Pin 16) | Mode Control & Sync Input | 0V–1V selects Burst Mode clamp level; tied to SVIN forces continuous conduction. |
| RUN/SS (Pin 7 / Pin 1) | Enable & Soft-Start | <0.5V disables IC; capacitor to ground controls output ramp time and inrush current. |
| SGND (Pin 8 / Pin 2) | Signal Ground | Reference for all small-signal pins; must connect to PGND at single point to minimize noise coupling. |
| PVIN (Pins 9,16 / Pins 3,10) | Power Input | Main power path for high-current switches; requires local low-ESR ceramic decoupling to PGND. |
| SW (Pins 10,11,14,15 / Pins 4,5,8,9) | Switch Node | Drain connection of internal P-FET and N-FET; drives external inductor; high dV/dt node requiring tight layout. |
| PGND (Pins 12,13 / Pins 6,7) | Power Ground | Return path for high-current switch paths; must be low-inductance connection to CIN/COUT negatives. |
| Exposed Pad (Pin 17) | Thermal & Electrical Ground | Must be soldered to PCB copper pour for thermal dissipation and signal integrity; electrically tied to SGND. |
Key Features
| Feature | Design Value |
|---|---|
| OPTI-LOOP® Compensation | Enables stable loop response across wide output capacitor ESR ranges (ceramic to polymer/tantalum) without external compensation components. |
| Selectably Forced Continuous/Burst Mode | Reduces EMI-sensitive applications' conducted noise (continuous) or maximizes light-load efficiency (Burst), with user-adjustable burst clamp voltage. |
| 100% Duty Cycle Operation | Maintains regulation down to VIN ≈ VOUT + IOUT × RDS(ON)_P, extending usable battery voltage range in portable equipment. |
| Internal Synchronous Power Switches | Eliminates need for external Schottky diode, reducing BOM count, board area, and forward-voltage losses. |
| Overtemperature Protection | Thermal shutdown activates at TJ = 125°C; device resumes operation after cooldown, preventing permanent damage. |
Applications
| Portable Medical Sensors | Notebook Subsystem Power |
|---|---|
|
Use Scenario: Wearable ECG monitor powered by single Li-ion cell with ultra-low standby current requirements. IC Role / Device Role / Timing Role: Primary buck regulator supplying 1.8V to microcontroller and 3.3V to analog front-end, entering Burst Mode during sensor sleep intervals. Use Value: 62µA quiescent current and 100% duty cycle operation extend battery life beyond 7 days per charge while maintaining fast wake-up response. |
Use Scenario: Core voltage rail for DDR memory and I/O interfaces in ultrabook platform with dynamic load demands. IC Role / Device Role / Timing Role: High-efficiency synchronous step-down converter delivering 2.5A at 1.2V with forced continuous mode to suppress switching noise near high-speed data lines. Use Value: 85mΩ/65mΩ RDS(ON) and 4MHz capability enable compact 1.0µH inductor and low-profile ceramic capacitors without sacrificing transient performance. |
| Distributed Point-of-Load Systems | Industrial Handheld Terminals |
|
Use Scenario: Local 3.3V rail generation from 5V backplane in modular PLC I/O module with strict thermal constraints. IC Role / Device Role / Timing Role: Compact, thermally enhanced QFN regulator providing regulated power to isolated communication ICs and ADCs. Use Value: Exposed thermal pad and 34°C/W θJA allow full 2.5A output in 4mm × 4mm footprint without heatsink, simplifying mechanical design. |
Use Scenario: Ruggedized barcode scanner with cold-temperature operation requirement (–30°C ambient). IC Role / Device Role / Timing Role: Main power converter supporting wide input range (2.625V–5.5V) and guaranteed –40°C to 125°C operation for battery and USB power sources. Use Value: Guaranteed performance over industrial temperature range and robust undervoltage lockout (2.5V threshold) prevent brownout resets during battery discharge. |
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 |
|---|---|---|---|
| MP2315DJ-LF-Z | Fixed 3.3V or adjustable 0.8V–5V output; 2A max; 2.5V–5.5V input; no SYNC/MODE pin; 30µA IQ in shutdown only. | Lacks Burst Mode control and external frequency sync; simpler interface but less flexible light-load optimization. | Choose when cost sensitivity outweighs need for programmable efficiency modes and precise ripple control. |
| TPS62865ARGTR | 2.5A output; 2.7V–6V input; 1.8V–5.5V adjustable output; 1.2µA IQ in deep sleep; integrated PMBus telemetry. | Includes I2C interface for real-time voltage/current monitoring; higher integration but larger 2.5mm × 2.5mm QFN-12 package. | Prefer when system-level telemetry, tighter output tolerance (±1%), or lower shutdown current are required over analog mode flexibility. |
Compared with MP2315DJ-LF-Z and TPS62865ARGTR, the LTC3412EUF#TRPBF offers superior analog configurability-especially for optimizing ripple vs. efficiency trade-offs via SYNC/MODE voltage and ITH-based current limiting-making it ideal for legacy or analog-centric designs where digital telemetry is unnecessary.
Availability
LTC3412EUF#TRPBF is available at Aetrix Electronics and suitable for portable medical sensors, notebook subsystem power, distributed point-of-load systems, and industrial handheld terminals requiring stable component supply with guaranteed long-term manufacturability.
Supply support for LTC3412EUF#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. (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing technologies, serving industrial, automotive, communications, and healthcare markets.
The LTC3412EUF#TRPBF belongs to ADI's Linear Technology legacy power management portfolio, designed specifically for high-efficiency, space-constrained DC/DC conversion in battery-powered and thermally demanding applications.
FAQ
What is the maximum output current capability of the LTC3412EUF#TRPBF?
The LTC3412EUF#TRPBF delivers up to 2.5A of continuous output current under typical thermal conditions (θJA = 34°C/W, TA = 25°C). Peak current limit is internally set to 4A–5.4A depending on input voltage and temperature, with short-circuit protection engaging above 4.8A valley current. Actual achievable current depends on PCB layout, input voltage, output voltage, and ambient temperature.
Does the LTC3412EUF#TRPBF require an external Schottky diode?
No, the LTC3412EUF#TRPBF does not require an external Schottky diode. It integrates both a P-channel high-side and N-channel low-side MOSFET for fully synchronous rectification, eliminating conduction losses and reverse recovery issues associated with external diodes. This reduces component count, board area, and improves efficiency across the entire load range.
How is the switching frequency programmed on the LTC3412EUF#TRPBF?
The switching frequency of the LTC3412EUF#TRPBF is set using an external resistor connected between the RT pin and ground. A 309kΩ resistor yields approximately 1MHz; the full range spans 300kHz to 4MHz. Alternatively, the internal oscillator can be synchronized to an external clock applied to the SYNC/MODE pin, supporting frequencies from 300kHz to 4MHz with 25% lower internal timing resistor value.
What is the purpose of the exposed thermal pad on the LTC3412EUF#TRPBF QFN package?
The exposed thermal pad (Pin 17) on the LTC3412EUF#TRPBF serves dual electrical and thermal functions: it is internally connected to SGND and must be soldered to a PCB copper pour for optimal heat dissipation. Proper thermal pad connection reduces junction-to-ambient thermal resistance to 34°C/W, enabling reliable 2.5A operation without additional heatsinking in most layouts.
Can the LTC3412EUF#TRPBF operate with input voltage below 2.625V?
No-the LTC3412EUF#TRPBF has a specified minimum input voltage of 2.625V per Absolute Maximum Ratings and Electrical Characteristics tables. Operation below this threshold may result in UVLO activation (trip point 2.375V–2.625V), unregulated output, or failure to start. For sub-2.6V applications, consider alternative regulators such as the LTC3642 or ADP5052 with lower VIN minima.
LTC3412EUF#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-WQFN 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):
- 2.625V
- 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-QFN (4x4)
LTC3412EUF#TRPBF FAQ
1.How can I place an order for LTC3412EUF#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3412EUF#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 LTC3412EUF#TRPBF reliable?
The price and inventory of LTC3412EUF#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3412EUF#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3412EUF#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3412EUF#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3412EUF#TRPBF?
LTC3412EUF#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3412EUF#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 LTC3412EUF#TRPBF?
For technical support, including LTC3412EUF#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3412EUF#TRPBF requirements.
6.How does Aetrix verify that LTC3412EUF#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3412EUF#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 LTC3412EUF#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3412EUF#TRPBF?
All LTC3412EUF#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3412EUF#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 LTC3412EUF#TRPBF part is unused and in its original packaging.
Return procedure for LTC3412EUF#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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