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Analog Devices Inc. LTC3412AIUF#PBF
- Part No.:
- LTC3412AIUF#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-WQFN Exposed Pad
- Datasheet:
-
LTC3412AIUF#PBF.pdf
- Description:
- IC REG BUCK ADJ 3A 16QFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,370
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Product details
Overview
LTC3412AIUF#PBF from Analog Devices is a high-efficiency monolithic synchronous step-down DC/DC converter with 3A output current, 2.25V–5.5V input range, and programmable switching frequency from 300kHz to 4MHz. It features ±2% output voltage accuracy, 77mΩ P-channel MOSFET RDS(ON), and operates in forced continuous or Burst Mode® for optimized light-load efficiency - deployed in notebook computers and point-of-load regulation.
For engineers reviewing the LTC3412AIUF#PBF datasheet, LTC3412AIUF#PBF pinout, LTC3412AIUF#PBF application, or LTC3412AIUF#PBF equivalent, key selection considerations include its 16-lead 4mm × 4mm QFN package with exposed thermal pad, 64µA quiescent current in Burst Mode®, 0.8V reference enabling low-output-voltage designs, and synchronization capability for EMI-sensitive systems.
Technical Context
The LTC3412AIUF#PBF employs constant-frequency current-mode control with OPTI-LOOP® compensation, supporting wide output capacitor ranges while maintaining stability across load and line variations. Its dual internal MOSFETs (77mΩ P-ch / 65mΩ N-ch) enable synchronous rectification without external diodes, and the ITH pin provides direct error amplifier output access for custom loop shaping.
Switching frequency is set via an external resistor on RT or synchronized externally via SYNC/MODE pin (300kHz–4MHz range). The device supports 100% duty cycle for ultra-low dropout operation and includes integrated overtemperature protection, power-good monitoring (±7.5% threshold), and undervoltage lockout (1.75V–2.25V).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 3A maximum continuous - supports high-current PoL rails in portable instruments and distributed power systems. |
| Input Voltage Range | 2.25V to 5.5V - compatible with single-cell Li-ion, USB, and intermediate bus voltages. |
| Switching Frequency | 300kHz to 4MHz - adjustable via RT resistor or external clock; enables compact magnetics and EMI optimization. |
| 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 always-on portable applications without sacrificing regulation. |
| RDS(ON) (P-FET) | 77mΩ typical - reduces conduction loss at full load, improving efficiency up to 95% at 3A. |
| Package | 16-lead 4mm × 4mm QFN with exposed thermal pad - provides low θJA = 37°C/W for thermally constrained layouts. |
Pinout & Package
Package: 16-lead (4mm × 4mm) plastic QFN with exposed thermal pad (Pin 17), rated for –40°C to +125°C junction temperature. Exposed pad must be soldered to PCB for thermal performance and electrical connection to SGND.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SVIN (Pin 1, 11) | Signal Input Supply | Provides bias for internal circuitry; decoupled separately from PVIN to minimize noise coupling into control loop. |
| PGOOD (Pin 2, 12) | Power-Good Monitor Output | Open-drain flag pulled low when VOUT deviates >±7.5%; used for system sequencing and fault reporting. |
| ITH (Pin 3, 13) | Error Amplifier Compensation Node | Direct access to transconductance amplifier output; enables custom compensation and current limit adjustment. |
| VFB (Pin 4, 14) | Feedback Input | Compares resistive divider output against 0.8V reference to regulate VOUT; leakage <0.2µA ensures accuracy. |
| RT (Pin 5, 15) | Oscillator Timing Input | Resistor-to-ground sets switching frequency; supports 300kHz–4MHz range with linear scaling. |
| SYNC/MODE (Pin 6, 16) | Mode Control & Clock Sync | Selects Burst Mode® (0–1V), forced continuous (tied to SVIN), or external sync (300kHz–4MHz falling-edge locked). |
| RUN/SS (Pin 7, 1) | Enable & Soft-Start Control | Shuts down below 0.5V; capacitor to ground controls output ramp time and inrush current limiting. |
| SGND (Pin 8, 2) | Signal Ground | Reference for all small-signal pins; connects to PGND at single point to avoid ground bounce in feedback path. |
| PVIN (Pins 9, 16, 3, 10) | Power Input Supply | High-current VIN connection; requires local low-ESR ceramic decoupling near PGND. |
| SW (Pins 10, 11, 14, 15, 4, 5, 8, 9) | Switch Node | Connects to inductor; carries high di/dt square wave - layout critical for EMI and efficiency. |
| PGND (Pins 12, 13, 6, 7) | Power Ground | Return path for high-current switches; must be low-inductance plane tied to CIN/COUT negatives. |
| Exposed Pad (Pin 17) | Thermal & Electrical Ground | Internally connected to SGND; mandatory soldering required for thermal dissipation and noise immunity. |
Key Features
| Feature | Design Value |
|---|---|
| Burst Mode® Operation | Reduces quiescent current to 64µA at light loads while maintaining regulation - ideal for battery-powered standby states. |
| OPTI-LOOP® Compensation | Enables stable transient response across wide output capacitance values (10µF–1000µF) without external tuning. |
| 100% Duty Cycle Capability | Supports dropout operation down to VIN ≈ VOUT + ILOAD×RDS(ON) - extends runtime in deep discharge conditions. |
| Programmable Burst Clamp | External voltage on SYNC/MODE pin sets minimum inductor peak current - directly controls output ripple vs. efficiency trade-off. |
| Integrated Power Good | Dedicated open-drain output with ±7.5% accuracy monitors regulation status - eliminates need for external supervisor IC. |
Applications
| Point-of-Load Regulation | Notebook Computers |
|---|---|
Use Scenario: Local 1.2V/3A supply for CPU core logic in space-constrained motherboard VRM zones. IC Role / Device Role: Primary synchronous buck regulator delivering tightly regulated, low-noise power with fast transient response. Use Value: 95% peak efficiency and 64µA quiescent current reduce thermal load and extend battery runtime during light-load idle states. |
Use Scenario: Main system rail conversion from 5V intermediate bus to 3.3V/3A for chipset and I/O peripherals. IC Role / Device Role: High-density step-down converter with Burst Mode® for dynamic power-state transitions (S0–S3). Use Value: 4MHz programmability enables use of 0.47µH inductors, reducing solution footprint by >40% vs. 1MHz alternatives. |
| Portable Instruments | Distributed Power Systems |
Use Scenario: Battery-powered handheld test equipment requiring clean 2.5V/3A analog supply with minimal self-heating. IC Role / Device Role: Precision-regulated buck stage with ±2% VOUT accuracy and low 20mVpp ripple in forced continuous mode. Use Value: 0.8V reference and 77mΩ RDS(ON) support accurate low-voltage outputs while minimizing thermal rise in sealed enclosures. |
Use Scenario: Modular rack-mounted power shelf distributing 12V to multiple 5V/3A downstream cards via individual regulators. IC Role / Device Role: Isolated point-of-load converter synchronized to system clock to suppress beat frequencies across modules. Use Value: External frequency synchronization (300kHz–4MHz) eliminates inter-module EMI coupling and simplifies EMC filtering. |
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 |
|---|---|---|---|
| TPS54332DRCT | 3A, 3.5V–28V input, fixed 600kHz freq, no Burst Mode®, higher IQ (275µA active) | Targets industrial 12V/24V inputs; lacks low-IQ sleep mode for battery systems | Choose for wide-input industrial rails where 28V tolerance and external soft-start are prioritized over light-load efficiency. |
| MP2332HGTL-Z | 3A, 4.5V–28V input, 500kHz–2.2MHz sync, 30µA IQ in skip mode, no PGOOD | Optimized for cost-sensitive 12V PoL; missing power-good flag and 0.8V reference precision | Choose for non-critical 12V-to-3.3V conversion where BOM cost outweighs sequencing and accuracy requirements. |
Compared with TPS54332DRCT and MP2332HGTL-Z, the LTC3412AIUF#PBF delivers superior light-load efficiency (64µA vs. ≥275µA), tighter output accuracy (±2% vs. ±3%), and integrated PGOOD - making it optimal for portable, battery-aware, and high-precision applications despite its narrower 2.25V–5.5V input range.
Availability
LTC3412AIUF#PBF is available at Aetrix Electronics and suitable for notebook computers, portable instruments, and point-of-load regulation requiring stable component supply, long-term lifecycle assurance, and consistent parametric performance across production batches.
Supply support for LTC3412AIUF#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 power management semiconductors, serving precision instrumentation, communications, and industrial markets since 1965.
The LTC3412AIUF#PBF belongs to Analog Devices' Power by Linear™ family of high-efficiency DC/DC converters, designed specifically for demanding portable and space-constrained power applications requiring low quiescent current, tight regulation, and robust thermal performance.
FAQ
What is the operating temperature range for the LTC3412AIUF#PBF?
The LTC3412AIUF#PBF is specified for –40°C to +125°C junction temperature operation. This I-grade rating ensures guaranteed performance across automotive cabin, industrial, and extended commercial environments. Thermal design must account for θJA = 37°C/W and mandatory soldering of the exposed pad to maintain reliability at full 3A load.
Does the LTC3412AIUF#PBF support external frequency synchronization?
Yes, the LTC3412AIUF#PBF supports external synchronization via the SYNC/MODE pin across 300kHz–4MHz. When driven by an external clock, the internal oscillator locks to the falling edge of that signal, enabling deterministic EMI reduction and multi-rail phase alignment. The RT resistor should be selected for ~25% lower nominal frequency to ensure reliable capture.
How does Burst Mode® operation affect output voltage ripple on the LTC3412AIUF#PBF?
Burst Mode® on the LTC3412AIUF#PBF increases output voltage ripple compared to forced continuous mode, but ripple magnitude is user-controllable via the SYNC/MODE pin voltage (0–1V burst clamp). Lower clamp voltages increase ripple amplitude but improve light-load efficiency; typical ripple remains under 25mVpp at 10mA load with proper output capacitance.
Can the LTC3412AIUF#PBF operate with 100% duty cycle, and what are the implications?
Yes, the LTC3412AIUF#PBF supports 100% duty cycle operation for ultra-low dropout, enabling VOUT regulation even when VIN approaches VOUT. In this mode, output voltage equals VIN minus ILOAD × RDS(ON) (77mΩ), so thermal design must verify junction temperature stays within 125°C - especially at low VIN and high load.
What is the purpose of the ITH pin on the LTC3412AIUF#PBF, and how is it used?
ITH is the error amplifier output node on the LTC3412AIUF#PBF, providing direct access to the control voltage that sets peak inductor current. It enables custom compensation networks, current limit adjustment, and external monitoring of regulation status. Leaving ITH unconnected disables regulation; typical operating range is 0.2V–1.4V, with 0.4V corresponding to zero-sense current.
LTC3412AIUF#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-WQFN 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-QFN (4x4)
LTC3412AIUF#PBF FAQ
1.How can I place an order for LTC3412AIUF#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3412AIUF#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 LTC3412AIUF#PBF reliable?
The price and inventory of LTC3412AIUF#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3412AIUF#PBF is usually 5 days.
3.What payment methods are accepted for LTC3412AIUF#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3412AIUF#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3412AIUF#PBF?
LTC3412AIUF#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3412AIUF#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 LTC3412AIUF#PBF?
For technical support, including LTC3412AIUF#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3412AIUF#PBF requirements.
6.How does Aetrix verify that LTC3412AIUF#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3412AIUF#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 LTC3412AIUF#PBF meets industry standards.
7.What is the process for return or replacement of LTC3412AIUF#PBF?
All LTC3412AIUF#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3412AIUF#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 LTC3412AIUF#PBF part is unused and in its original packaging.
Return procedure for LTC3412AIUF#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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