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Analog Devices Inc. LTC3412AEUF#TRPBF
- Part No.:
- LTC3412AEUF#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-WQFN Exposed Pad
- Datasheet:
-
LTC3412AEUF#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 3A 16QFN
- Quantity:
- Payment:
- Shipping:
Inventory:5,028
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Product details
Overview
LTC3412AEUF#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 with ±2% output voltage accuracy, operates from 2.25V to 5.5V input, supports programmable switching frequency from 300kHz to 4MHz, and features low quiescent current (64µA) in Burst Mode for extended battery life in notebook computers and portable instruments.
For engineers reviewing the LTC3412AEUF#TRPBF datasheet, LTC3412AEUF#TRPBF pinout, LTC3412AEUF#TRPBF application, or LTC3412AEUF#TRPBF equivalent, key selection considerations include its 77mΩ P-channel and 65mΩ N-channel internal MOSFETs, OPTI-LOOP® compensation for transient response optimization, selectable forced continuous/Burst Mode® operation, 100% duty cycle low-dropout capability, and power-good monitoring with ±7.5% tolerance.
Technical Context
The LTC3412AEUF#TRPBF employs a constant-frequency, current-mode control architecture with integrated P-channel and N-channel synchronous power switches. Its error amplifier compares VFB against a precise 0.8V reference, modulating ITH to regulate peak inductor current - enabling stable operation across wide load and output capacitance ranges via OPTI-LOOP® compensation.
Switching frequency is set externally via RT pin resistor or synchronized to an external clock (300kHz–4MHz). The SYNC/MODE pin selects between forced continuous mode (reduced EMI), Burst Mode® (64µA IQ), or pulse-skipping operation - with burst clamp voltage directly controlling light-load ripple and efficiency trade-offs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | Up to 3A 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, Li-polymer, and multi-cell alkaline/nickel-based batteries. |
| Output Voltage Accuracy | ±2% over temperature - ensures tight regulation for sensitive analog and digital loads. |
| Switching Frequency | 300kHz to 4MHz - enables use of small 0.47µH inductors and ceramic capacitors for miniaturized layouts. |
| RDS(ON) (P-FET / N-FET) | 77mΩ / 65mΩ - minimizes conduction loss and improves full-load efficiency up to 95%. |
| Quiescent Current | 64µA in Burst Mode - extends runtime in always-on or low-duty-cycle portable applications. |
| Feedback Reference | 0.8V ±1.5% - allows precise low-output-voltage generation (e.g., 0.8V core supplies) with standard resistor dividers. |
Pinout & Package
Package: 16-lead (4mm × 4mm) plastic QFN with exposed pad (Pin 17 = SGND). Thermal resistance θJA = 37°C/W, θJC = 5°C/W. Exposed pad must be soldered to PCB for electrical integrity and thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SVIN (Pin 1, 11) | Signal Input Supply | Provides clean bias for internal circuitry; requires local decoupling to SGND to minimize noise coupling. |
| PGOOD (Pin 2, 12) | Power-Good Monitor Output | Open-drain flag pulled low if VOUT deviates >±7.5% - enables system-level power sequencing and fault detection. |
| ITH (Pin 3, 13) | Error Amplifier Compensation Node | Controls peak inductor current threshold; voltage range 0.2V–1.4V maps directly to current limit setting. |
| VFB (Pin 4, 14) | Feedback Input | Connects to resistive divider from VOUT; regulates output by comparing against 0.8V internal reference. |
| RT (Pin 5, 15) | Oscillator Timing Resistor Input | Sets switching frequency via external resistor (e.g., 294kΩ → ~1MHz); enables precise frequency tuning. |
| SYNC/MODE (Pin 6, 16) | Mode Selection & Clock Sync | Tied to SVIN → forced continuous; 0–1V → adjustable Burst Mode; external clock → synchronization (300kHz–4MHz). |
| RUN/SS (Pin 7, 1) | Enable & Soft-Start Control | <0.5V disables IC; capacitor to ground sets controlled ramp-up of output current to prevent inrush. |
| SGND (Pin 8, 2) | Signal Ground Reference | Reference for all small-signal pins (VFB, ITH, RT); connects to PGND at single point to avoid ground loops. |
| PVIN (Pins 9, 16, 3, 10) | Power Input Supply | High-current VIN path; requires low-ESR bulk capacitor to PGND to suppress switching transients. |
| SW (Pins 10, 11, 14, 15, 4, 5, 8, 9) | Switch Node | Drain connection of internal P-FET/N-FET; drives external inductor; high di/dt node requiring minimized loop area. |
| PGND (Pins 12, 13, 6, 7) | Power Ground Return | Return path for high-current PVIN and SW paths; must connect close to CIN/COUT negative terminals. |
| Exposed Pad (Pin 17) | Thermal & Electrical Ground | Internally connected to SGND; mandatory soldering to PCB plane for thermal dissipation and signal integrity. |
Key Features
| Feature | Design Value |
|---|---|
| OPTI-LOOP® Compensation | Allows dynamic adjustment of loop bandwidth via external compensation components - maintains stability across wide output capacitor ESR and capacitance ranges without redesign. |
| Selectable Operating Modes | Burst Mode® (64µA IQ), forced continuous (low-noise), or pulse-skipping - configurable per application EMI vs. efficiency requirements. |
| 100% Duty Cycle Operation | Enables dropout regulation down to VOUT + VDS(ON) × ILOAD - critical for maintaining output during battery voltage sag in portable systems. |
| Integrated Power Switches | Low RDS(ON) P-channel (77mΩ) and N-channel (65mΩ) MOSFETs eliminate need for external Schottky diode and reduce BOM count. |
| Robust Protection Suite | Includes overtemperature shutdown, short-circuit protection (4.4A valley current limit), and undervoltage lockout (1.75V–2.25V threshold). |
Applications
| Point-of-Load Regulation | Notebook Computers |
|---|---|
Use Scenario: Regulating 1.2V/3A CPU core voltage from a 3.3V intermediate rail in ultra-thin notebooks. IC Role / Device Role / Timing Role: Primary synchronous buck controller managing transient response and efficiency under dynamic load steps. Use Value: 95% peak efficiency and OPTI-LOOP® ensure minimal thermal rise and stable voltage during CPU burst loads. |
Use Scenario: Powering DDR memory I/O supply (1.5V/2.5A) with tight ripple and fast load-step response. IC Role / Device Role / Timing Role: High-frequency (2MHz) step-down regulator delivering low-noise, low-ripple power with soft-start sequencing. Use Value: Programmable frequency avoids interference with display or audio bands; PGOOD enables safe memory initialization. |
| Portable Instruments | Distributed Power Systems |
Use Scenario: Supplying 3.3V/1.8A to mixed-signal data acquisition circuitry in handheld test equipment. IC Role / Device Role / Timing Role: Low-quiescent-current PoL regulator operating from single Li-ion cell (2.7V–4.2V). Use Value: 64µA Burst Mode IQ extends battery life during standby; 100% duty cycle sustains output as battery discharges below 3.3V. |
Use Scenario: Generating isolated 5V/2A auxiliary rail from a 12V backplane in industrial PLC modules. IC Role / Device Role / Timing Role: Compact, high-efficiency secondary-side regulator replacing discrete buck solutions. Use Value: QFN package and integrated FETs reduce footprint by >40% vs. controller+MOSFET solutions; thermal design simplified by low θJC. |
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 500kHz frequency; no Burst Mode; higher 120mΩ RDS(ON); 2A max output. | Lower cost for fixed-frequency, moderate-efficiency applications where light-load IQ is not critical. | Choose when board space allows larger inductor and system does not require sub-100µA sleep current. |
| TPS54332DDAR | External MOSFETs required; wider 3.5–28V input; 3A output; 57µA IQ in Eco-mode. | Higher input voltage support and design flexibility at expense of BOM count and layout complexity. | Prefer for industrial inputs >5.5V or when thermal management requires discrete FETs. |
Compared with MP2315DJ-LF-Z and TPS54332DDAR, the LTC3412AEUF#TRPBF offers superior light-load efficiency via programmable Burst Mode®, tighter output accuracy (±2% vs. ±3%), and integrated low-RDS(ON) switches - making it optimal for space- and battery-sensitive portable designs demanding precision regulation.
Availability
LTC3412AEUF#TRPBF is available at Aetrix Electronics and suitable for point-of-load regulation, notebook computer power delivery, and portable instrument power management requiring stable component supply, long-term lifecycle support, and guaranteed parametric performance across –40°C to 125°C junction temperature.
Supply support for LTC3412AEUF#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 LTC3412A belongs to Analog Devices' Power by Linear™ family of high-efficiency monolithic DC/DC converters, designed specifically for compact, high-current point-of-load applications in battery-powered and thermally constrained systems.
FAQ
What is the maximum output current capability of the LTC3412AEUF#TRPBF?
The LTC3412AEUF#TRPBF delivers up to 3A of continuous output current under typical thermal conditions (θJA = 37°C/W, 2-layer PCB). Actual achievable current depends on ambient temperature, PCB copper area, and airflow. At 125°C junction temperature, derating begins above ~2.4A in still air; thermal design must ensure TJ ≤ 125°C per Absolute Maximum Ratings.
Does the LTC3412AEUF#TRPBF support synchronization to an external clock?
Yes, the LTC3412AEUF#TRPBF supports external clock synchronization via the SYNC/MODE pin. An external clock signal in the 300kHz–4MHz range can be applied directly to this pin, locking the internal oscillator's switching edge to the falling edge of the external source. The internal RT resistor should be selected for a frequency ~25% lower than the sync frequency to ensure reliable capture.
How does Burst Mode® operation affect output voltage ripple on the LTC3412AEUF#TRPBF?
Burst Mode® operation on the LTC3412AEUF#TRPBF increases output voltage ripple compared to forced continuous mode, but ripple magnitude is adjustable via the SYNC/MODE pin voltage (0–1V). Higher burst clamp voltage reduces ripple frequency and amplitude; lower voltage increases burst frequency and ripple. Typical ripple in Burst Mode is <20mVPP with 22µF ceramic output capacitance at 3A load.
What is the purpose of the exposed pad (Pin 17) on the LTC3412AEUF#TRPBF QFN package?
The exposed pad (Pin 17) on the LTC3412AEUF#TRPBF is internally connected to SGND and serves dual functions: (1) electrical - providing low-inductance grounding for signal integrity and noise reduction; (2) thermal - enabling efficient heat transfer from the die to the PCB. It must be soldered to a dedicated SGND copper pour using ≥9 solder paste vias for rated θJC = 5°C/W performance.
Can the LTC3412AEUF#TRPBF operate with input voltage below 2.25V?
No - the LTC3412AEUF#TRPBF has a minimum specified input voltage of 2.25V per Absolute Maximum Ratings and Electrical Characteristics. Operation below this voltage may result in unstable regulation, failure to start, or undefined behavior. The undervoltage lockout (UVLO) threshold is 1.75V–2.25V, ensuring the device remains disabled until VIN exceeds the guaranteed operational range.
LTC3412AEUF#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)
LTC3412AEUF#TRPBF FAQ
1.How can I place an order for LTC3412AEUF#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3412AEUF#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 LTC3412AEUF#TRPBF reliable?
The price and inventory of LTC3412AEUF#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3412AEUF#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3412AEUF#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3412AEUF#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3412AEUF#TRPBF?
LTC3412AEUF#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3412AEUF#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 LTC3412AEUF#TRPBF?
For technical support, including LTC3412AEUF#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3412AEUF#TRPBF requirements.
6.How does Aetrix verify that LTC3412AEUF#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3412AEUF#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 LTC3412AEUF#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3412AEUF#TRPBF?
All LTC3412AEUF#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3412AEUF#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 LTC3412AEUF#TRPBF part is unused and in its original packaging.
Return procedure for LTC3412AEUF#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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