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Analog Devices Inc. LTC3412AIUF#TRPBF
- Part No.:
- LTC3412AIUF#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-WQFN Exposed Pad
- Datasheet:
-
LTC3412AIUF#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 3A 16QFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,680
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Product details
Overview
LTC3412AIUF#TRPBF from Analog Devices is a monolithic synchronous step-down DC/DC converter optimized for point-of-load regulation in portable and battery-powered systems. It delivers up to 3A output current, operates from 2.25V to 5.5V input, supports programmable switching frequency from 300kHz to 4MHz, features ±2% output voltage accuracy, and integrates low-RDS(ON) P- and N-channel MOSFETs (77mΩ/65mΩ) for high efficiency up to 95% in notebook computers and distributed power systems.
For engineers reviewing the LTC3412AIUF#TRPBF datasheet, LTC3412AIUF#TRPBF pinout, LTC3412AIUF#TRPBF application, or LTC3412AIUF#TRPBF equivalent, key selection considerations include its 16-lead 4mm × 4mm QFN package with exposed pad (GND), selectable Burst Mode® or forced continuous operation, 0.8V reference enabling sub-1V outputs, Power Good monitoring, and OPTI-LOOP® compensation for stable transient response across wide load and capacitor ranges.
Technical Context
The LTC3412AIUF#TRPBF employs a constant-frequency current-mode control architecture with internal P- and N-channel synchronous power switches. Its peak-current limit is set by the ITH pin voltage and modulated via slope compensation recovery to maintain consistent maximum output current across duty cycles up to 100%.
It supports three operating modes via the SYNC/MODE pin: forced continuous (tied to SVIN), Burst Mode® (0V–1V clamp), or pulse-skipping (grounded). Frequency is set by an external resistor on RT or synchronized externally from 300kHz to 4MHz, with oscillator timing correlated to ROSC = 3.08×10¹¹/f Ω.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 3A continuous - supports high-current PoL rails without external MOSFETs or diodes. |
| Input Voltage Range | 2.25V to 5.5V - compatible with single-cell Li-ion, Li-polymer, and 3.3V/5V system rails. |
| Switching Frequency | 300kHz to 4MHz - enables compact magnetics and capacitors; 4MHz operation supported by design. |
| Feedback Reference | 0.8V ±2% - allows precise low-voltage outputs (e.g., 0.8V–5V) using standard resistor dividers. |
| Quiescent Current | 64µA in Burst Mode - extends battery life in standby or light-load portable applications. |
| RDS(ON) (P-FET/N-FET) | 77mΩ / 65mΩ - minimizes conduction loss and eliminates need for external Schottky diode. |
| Power Good Accuracy | ±7.5% window - provides reliable output voltage supervision for system sequencing and fault detection. |
Pinout & Package
Package: 16-lead (4mm × 4mm) plastic QFN with exposed thermal pad (Pin 17), rated for –40°C to +125°C junction temperature (θJA = 37°C/W, θJC = 5°C/W). Exposed pad must be soldered to PCB GND for thermal and electrical performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SVIN (Pin 1, Pin 11) | Signal Input Supply | Provides bias for internal circuitry; decoupled separately to SGND to avoid noise coupling into control loop. |
| PGOOD (Pin 2, Pin 12) | Open-Drain Power Good Monitor | Asserts low when VOUT deviates >±7.5% from regulation; used for system enable/disable sequencing. |
| ITH (Pin 3, Pin 13) | Error Amplifier Compensation Node | Controls peak inductor current threshold; voltage range 0.2V–1.4V directly sets current limit and loop dynamics. |
| VFB (Pin 4, Pin 14) | Feedback Input | Compares resistive divider output against 0.8V reference to regulate VOUT; leakage <0.2µA preserves accuracy. |
| RT (Pin 5, Pin 15) | Oscillator Timing Resistor Input | Connects to ground via resistor to set fSW; value calculated as ROSC = 3.08×10¹¹/f Ω. |
| SYNC/MODE (Pin 6, Pin 16) | Mode Select & Clock Sync Input | Selects Burst Mode® (0–1V), forced continuous (tied to SVIN), or sync (300kHz–4MHz external clock). |
| RUN/SS (Pin 7, Pin 1) | Enable & Soft-Start Control | Shuts down IC when <0.5V; capacitor to ground sets soft-start ramp time for controlled VOUT rise. |
| SGND (Pin 8, Pin 2) | Signal Ground Reference | Reference for all small-signal pins (VFB, ITH, RT); connects to PGND at single point to minimize noise. |
| PVIN (Pins 9,16; Pins 3,10) | Power Input Supply | High-current VIN path; requires local low-ESR ceramic capacitor to PGND to suppress switching transients. |
| SW (Pins 10,11,14,15; Pins 4,5,8,9) | Switch Node | Connects to inductor; carries high di/dt square wave; layout critical to minimize EMI and voltage spikes. |
| PGND (Pins 12,13; Pins 6,7) | Power Ground Return | Return path for PVIN and SW currents; must be connected near CIN/COUT negative terminals. |
Key Features
| Feature | Design Value |
|---|---|
| OPTI-LOOP® Compensation | Enables stable transient response across wide output capacitance (10µF–1000µF) and load (0.1A–3A) ranges without external tuning. |
| Selectably Adjustable Burst Clamp | External voltage on SYNC/MODE (0–1V) sets minimum inductor peak current, allowing ripple vs. efficiency trade-off optimization. |
| 100% Duty Cycle Low Dropout | Maintains regulation down to VIN ≈ VOUT + IOUT×RDS(ON), extending runtime in battery discharge tail-end. |
| Integrated Synchronous Switches | Eliminates external Schottky diode and reduces BOM count; P-FET RDS(ON) = 77mΩ, N-FET RDS(ON) = 65mΩ @ TJ = 25°C. |
| Overtemperature Protection | Thermal shutdown activates at TJ = 125°C; device resumes operation after cooldown with hysteresis. |
Applications
| Point-of-Load Regulation | Notebook Computers |
|---|---|
Use Scenario: Regulating core voltage for Intel Core i-series or AMD Ryzen mobile processors requiring tight tolerance and fast transient response. IC Role / Device Role / Timing Role: Primary synchronous buck regulator delivering 0.8V–1.35V at up to 3A with ±2% accuracy and Power Good signaling for CPU enable. Use Value: OPTI-LOOP® ensures stable regulation under dynamic CPU load steps; 64µA quiescent current extends sleep-mode battery life. |
Use Scenario: Powering DDR4/LPDDR4 memory subsystems and GPU I/O rails in ultrabooks and 2-in-1 devices. IC Role / Device Role / Timing Role: Secondary buck converter generating 1.2V/1.8V/3.3V rails with programmable 300kHz–4MHz switching to avoid RF interference bands. Use Value: 4MHz capability enables use of 0.47µH inductors and 22µF ceramic output caps, reducing board area by >40% vs. 500kHz designs. |
| Portable Instruments | Distributed Power Systems |
Use Scenario: Supplying precision analog front-ends (ADCs, DACs, op-amps) in handheld test equipment and medical sensors. IC Role / Device Role / Timing Role: Low-noise, low-ripple power source with forced continuous mode option to suppress switching harmonics near sensitive signal paths. Use Value: 77mΩ/65mΩ MOSFETs and integrated synchronous rectification reduce output ripple to <10mVpp at 3A, minimizing measurement error. |
Use Scenario: Local regulation in telecom line cards, industrial PLCs, or FPGA-based edge AI modules where multiple isolated rails are required. IC Role / Device Role / Timing Role: High-efficiency intermediate bus converter stepping 5V/3.3V down to 1.2V/0.85V for FPGA core logic with synchronization to system clock. Use Value: External clock sync (300kHz–4MHz) enables deterministic EMI filtering and eliminates beat frequencies in multi-rail systems. |
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 |
|---|---|---|---|
| TPS543320RTVR | 3A, 4.5V–18V input, fixed 500kHz/2.2MHz freq, 0.6V ref, no Burst Mode, higher VIN range | Targets higher-input industrial/motor drives; lacks low-IQ mode for battery apps | Choose for 12V intermediate bus conversion where LTC3412AIUF#TRPBF's 5.5V max VIN is insufficient. |
| MP2332HGTL-Z | 3A, 4.5V–21V input, 500kHz–2.2MHz freq, 0.8V ref, 30µA IQ, no PGOOD or sync | Cost-optimized consumer power; missing Power Good and frequency sync for system-critical designs | Choose for cost-sensitive, non-safety-critical applications where PGOOD sequencing and clock sync are unnecessary. |
Compared with TPS543320RTVR and MP2332HGTL-Z, the LTC3412AIUF#TRPBF uniquely combines ultra-low 64µA quiescent current, 2.25V min VIN, 0.8V reference, and full feature set (PGOOD, sync, Burst clamp) in a thermally enhanced 4mm × 4mm QFN-making it optimal for space-constrained, battery-sensitive designs requiring both high light-load efficiency and robust system integration.
Availability
LTC3412AIUF#TRPBF is available at Aetrix Electronics and suitable for point-of-load regulation, notebook computer power management, and portable instrumentation requiring stable component supply, long-term lifecycle support, and guaranteed parametric performance over –40°C to +125°C.
Supply support for LTC3412AIUF#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. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving precision instrumentation, communications, and industrial markets since 1965.
The LTC3412AIUF#TRPBF belongs to Analog Devices' Power by Linear™ family of high-efficiency monolithic DC/DC converters, designed specifically for demanding portable, automotive, and industrial point-of-load applications requiring minimal external components and exceptional thermal performance.
FAQ
What is the maximum output current capability of the LTC3412AIUF#TRPBF?
The LTC3412AIUF#TRPBF delivers up to 3A of continuous output current under typical conditions (TA ≤ 85°C, proper PCB layout with thermal pad soldered). Peak current limit is internally set to 4.5A–6A depending on junction temperature and input voltage, with short-circuit protection engaging above 4.4A valley current to prevent runaway.
Does the LTC3412AIUF#TRPBF support synchronization to an external clock?
Yes, the LTC3412AIUF#TRPBF supports external clock synchronization via the SYNC/MODE pin. An external clock signal between 300kHz and 4MHz can be applied directly to this pin, locking the internal oscillator's switching edge to the falling edge of the external clock while disabling Burst Mode® and setting burst clamp to 0V.
What is the purpose of the ITH pin on the LTC3412AIUF#TRPBF?
The ITH pin on the LTC3412AIUF#TRPBF serves as the error amplifier output and peak current threshold control node. Its voltage (0.2V–1.4V) directly sets the current comparator trip point, governing peak inductor current and thus output current capability. It also functions as the compensation point for loop stability tuning.
Can the LTC3412AIUF#TRPBF operate with input voltages below 2.5V?
Yes, the LTC3412AIUF#TRPBF is fully specified to operate from 2.25V to 5.5V input. At low input voltages near 2.25V, RDS(ON) of both internal MOSFETs increases slightly, so thermal design must verify that power dissipation remains within limits-especially during 100% duty cycle dropout operation.
How does Burst Mode® operation improve efficiency in the LTC3412AIUF#TRPBF?
Burst Mode® operation in the LTC3412AIUF#TRPBF reduces gate charge losses at light loads by intermittently enabling/disabling the power stage. When average inductor current falls below the burst clamp level, the IC enters sleep mode drawing only 64µA, then wakes periodically to replenish output capacitor charge-achieving >85% efficiency at 10mA load while maintaining tight output regulation.
LTC3412AIUF#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):
- 2.25V
- 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-QFN (4x4)
LTC3412AIUF#TRPBF FAQ
1.How can I place an order for LTC3412AIUF#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3412AIUF#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 LTC3412AIUF#TRPBF reliable?
The price and inventory of LTC3412AIUF#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3412AIUF#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3412AIUF#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3412AIUF#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3412AIUF#TRPBF?
LTC3412AIUF#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3412AIUF#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 LTC3412AIUF#TRPBF?
For technical support, including LTC3412AIUF#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3412AIUF#TRPBF requirements.
6.How does Aetrix verify that LTC3412AIUF#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3412AIUF#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 LTC3412AIUF#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3412AIUF#TRPBF?
All LTC3412AIUF#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3412AIUF#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 LTC3412AIUF#TRPBF part is unused and in its original packaging.
Return procedure for LTC3412AIUF#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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