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Analog Devices Inc. LTC3412AIFE#TRPBF
- Part No.:
- LTC3412AIFE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LTC3412AIFE#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 3A 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,325
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Product details
Overview
LTC3412AIFE#TRPBF from Analog Devices is a 3A, 4MHz monolithic synchronous step-down DC/DC regulator with current-mode control, operating from 2.25V to 5.5V input and delivering 0.8V–5V output. It integrates 77mΩ P-channel and 65mΩ N-channel MOSFETs, supports programmable frequency (300kHz–4MHz), and delivers up to 95% efficiency in notebook point-of-load applications.
For engineers reviewing the LTC3412AIFE#TRPBF datasheet, LTC3412AIFE#TRPBF pinout, LTC3412AIFE#TRPBF application, or LTC3412AIFE#TRPBF equivalent, key selection criteria include its ±2% output voltage accuracy, 64µA quiescent current in Burst Mode, 100% duty cycle low-dropout operation, power-good monitoring, and thermal protection - all critical for portable instrument and distributed power system designs.
Technical Context
The LTC3412AIFE#TRPBF employs constant-frequency current-mode control with OPTI-LOOP® compensation, enabling stable transient response across wide load and output capacitor ranges. Its dual-MOSFET architecture eliminates external diode losses, while internal slope compensation recovery maintains peak inductor current consistency above 40% duty cycle.
It supports three operational modes via SYNC/MODE pin: forced continuous (for low-noise EMI-sensitive systems), Burst Mode® with adjustable clamp (for ultra-low IQ at light loads), and pulse-skipping (grounded SYNC/MODE). Frequency synchronization accepts external clocks from 300kHz to 4MHz, with internal oscillator set by RT resistor or external clock edge alignment.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 3A continuous - supports high-current point-of-load rails without external power stages. |
| Input Voltage Range | 2.25V to 5.5V - compatible with single-cell Li-ion, USB, and multi-rail intermediate bus supplies. |
| Switching Frequency | 300kHz to 4MHz - enables compact magnetics; 4MHz operation allows sub-1µH inductors in space-constrained designs. |
| Feedback Reference | 0.8V ±2% - permits precise low-voltage outputs (e.g., 0.8V, 1.0V, 1.2V) using standard resistor dividers. |
| Quiescent Current | 64µA in Burst Mode - extends battery runtime in always-on portable instrumentation. |
| RDS(ON) | 77mΩ (P-FET) / 65mΩ (N-FET) - minimizes conduction loss; enables >95% efficiency at 3A/2.5V out from 3.3V in. |
| Power Good Accuracy | ±7.5% window - provides reliable system-level rail monitoring for sequencing and fault detection. |
Pinout & Package
Package: 16-lead plastic TSSOP with exposed pad (FE package); rated for –40°C to +125°C junction temperature; exposed pad must be soldered to SGND for thermal and electrical performance (θJA = 38°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SVIN (Pin 1, 11) | Signal Input Supply | Provides bias for control circuitry; decoupled separately from PVIN to minimize noise coupling into error amplifier. |
| PGOOD (Pin 2, 12) | Open-Drain Power-Good Monitor | Asserts low when VOUT deviates >±7.5% from regulation; used for system enable/disable sequencing. |
| 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 | Compares resistive divider output against 0.8V reference; sets regulated output voltage per VOUT = 0.8V × (1 + R2/R1). |
| RT (Pin 5, 15) | Oscillator Timing Resistor Input | Resistor to ground sets switching frequency: fOSC ≈ 308 GHz / ROSC (e.g., 294kΩ → ~1.04MHz). |
| SYNC/MODE (Pin 6, 16) | Mode Select & Sync Input | Tied to SVIN → forced continuous; 0–1V → adjustable Burst Mode clamp; external clock → sync mode (300kHz–4MHz). |
| RUN/SS (Pin 7, 1) | Enable & Soft-Start Control | <0.5V disables IC; capacitor to ground controls output ramp time and inrush current limiting. |
| SGND (Pin 8, 2) | Signal Ground Reference | Reference for all small-signal pins (VFB, ITH, RUN/SS); connects to PGND at single point to avoid ground loops. |
| PVIN (Pins 9, 16) | Main Power Input | High-current VIN path; requires local low-ESR ceramic decoupling to PGND near IC edge. |
| SW (Pins 10, 11, 14, 15) | Switch Node | Connects to inductor; carries high di/dt square wave; layout requires minimum loop area to reduce EMI. |
| PGND (Pins 12, 13) | Power Ground Return | Return path for high-current SW and PVIN paths; ties to CIN/COUT (–) terminals and exposed pad. |
Key Features
| Feature | Design Value |
|---|---|
| Burst Mode® with Adjustable Clamp | Enables 64µA IQ at light loads; clamp voltage (0–1V on SYNC/MODE) directly sets minimum peak inductor current and ripple trade-off. |
| OPTI-LOOP® Compensation | Allows single-pole compensation network optimization across wide output capacitance (10µF–1000µF) and load ranges without stability re-tuning. |
| 100% Duty Cycle Operation | Maintains regulation down to VIN = VOUT; critical for battery-powered systems during brownout or deep discharge conditions. |
| Integrated Dual MOSFETs | Eliminates external Schottky diode and gate driver; reduces BOM count and PCB area while improving thermal performance. |
| Overtemperature Protection | Thermal shutdown activates at TJ = 125°C; auto-recovery after cooldown ensures robustness in thermally constrained enclosures. |
Applications
| Point-of-Load Regulation | Notebook Computers |
|---|---|
Use Scenario: Local 1.2V/3A supply for CPU core logic in ultraportable notebooks with tight thermal envelopes. IC Role / Device Role: Primary synchronous buck regulator delivering tightly regulated, low-noise core voltage with fast transient response. Use Value: 95% efficiency at full load and 64µA quiescent current in Burst Mode extend battery life while maintaining <1% output deviation during 0→3A load steps. |
Use Scenario: Dual-rail power delivery (e.g., 3.3V I/O + 1.8V memory) in clamshell-form factor notebooks. IC Role / Device Role: High-density, thermally efficient step-down converter supporting dynamic voltage scaling and rapid sleep/wake transitions. Use Value: 4MHz capability enables 0.47µH inductors and 22µF ceramic output caps, reducing solution footprint by >40% vs. 500kHz alternatives. |
| Portable Instruments | Distributed Power Systems |
Use Scenario: Battery-powered handheld test equipment requiring clean 2.5V analog supply with minimal self-heating. IC Role / Device Role: Low-noise, low-IQ power stage powering precision ADCs, DACs, and op-amp signal chains. Use Value: Forced continuous mode suppresses switching harmonics in sensitive analog bands; ±2% VREF ensures measurement accuracy over temperature. |
Use Scenario: Intermediate bus conversion (5V → 3.3V/3A) in modular industrial controllers with multiple daughterboards. IC Role / Device Role: Robust, thermally managed POL regulator supporting hot-swap and sequencing requirements. Use Value: PGOOD output enables interlocked power-up; 125°C max junction rating supports operation in enclosed cabinets without forced airflow. |
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 |
|---|---|---|---|
| TPS54332DR | 3A, 5.5VIN, fixed 500kHz/2.2MHz; no Burst Mode; higher IQ (120µA); 110mΩ/120mΩ FETs | Less suitable for battery-critical apps; better for cost-sensitive, fixed-frequency industrial supplies | Choose TPS54332DR when fixed frequency simplifies EMI filtering and thermal margin exceeds 15°C. |
| MP2332GJ-Z | 3A, 6VIN, 500kHz–2.2MHz; 75mΩ/50mΩ FETs; 30µA IQ in skip mode; no PGOOD or sync | Lacks power-good signaling and frequency synchronization - limits use in sequenced or noise-sensitive systems | Choose MP2332GJ-Z where ultra-low IQ and compact QFN are prioritized over system-level monitoring and timing control. |
Compared with TPS54332DR and MP2332GJ-Z, the LTC3412AIFE#TRPBF uniquely combines 4MHz programmability, adjustable Burst Mode clamp, PGOOD, and OPTI-LOOP® for optimal trade-offs among size, efficiency, noise, and system integration in portable and distributed power designs.
Availability
LTC3412AIFE#TRPBF is available at Aetrix Electronics and suitable for point-of-load regulation, notebook computers, portable instruments, distributed power systems, and high-efficiency embedded power rails requiring stable component supply across extended temperature and volume production cycles.
Supply support for LTC3412AIFE#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 power management markets.
The LTC3412AIFE#TRPBF belongs to the LTC® monolithic DC/DC regulator product line, designed specifically for high-efficiency, high-density point-of-load conversion in space- and power-constrained portable and industrial systems.
FAQ
What is the maximum supported switching frequency for the LTC3412AIFE#TRPBF?
The LTC3412AIFE#TRPBF supports a programmable switching frequency range of 300kHz to 4MHz. While 4MHz operation is guaranteed by design (not production-tested), it enables ultra-compact solutions using sub-1µH inductors and low-ESR ceramic capacitors - ideal for thin-profile notebook and portable instrument designs where board area is constrained.
How does the SYNC/MODE pin configure Burst Mode® operation on the LTC3412AIFE#TRPBF?
On the LTC3412AIFE#TRPBF, applying a voltage between 0V and 1V to the SYNC/MODE pin enables Burst Mode® with an externally adjustable burst clamp level. This voltage directly sets the minimum peak inductor current, allowing designers to tune output voltage ripple versus light-load efficiency - a capability not found in fixed-clamp or skip-mode-only regulators.
Does the LTC3412AIFE#TRPBF support 100% duty cycle operation, and what is its practical benefit?
Yes, the LTC3412AIFE#TRPBF supports true 100% duty cycle operation. This allows regulation to be maintained even when input voltage drops to the output voltage level - essential for extending usable battery life in Li-ion-powered portable instruments and notebooks during deep discharge, without requiring backup LDOs or complex power-path management.
What is the purpose of the ITH pin on the LTC3412AIFE#TRPBF, and how is it used in design?
The ITH pin on the LTC3412AIFE#TRPBF is the error amplifier's compensation node and directly controls the peak inductor current threshold. Its voltage (0.2V–1.4V) sets current limit dynamically; it also serves as the connection point for Type II or Type III compensation networks. Proper ITH network design ensures stability across load and capacitor variations - enabled by OPTI-LOOP® architecture.
Can the LTC3412AIFE#TRPBF be synchronized to an external clock, and what are the constraints?
Yes, the LTC3412AIFE#TRPBF can synchronize its switching to an external clock applied to the SYNC/MODE pin, within 300kHz–4MHz. The external clock must exceed the RT-resistor-set frequency by ≥25% for reliable lock; during sync, burst clamp defaults to 0V and switching begins on the falling edge of the external clock - useful for EMI reduction in noise-sensitive systems.
LTC3412AIFE#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-TSSOP (0.173", 4.40mm Width) 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-TSSOP-EP
LTC3412AIFE#TRPBF FAQ
1.How can I place an order for LTC3412AIFE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3412AIFE#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 LTC3412AIFE#TRPBF reliable?
The price and inventory of LTC3412AIFE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3412AIFE#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3412AIFE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3412AIFE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3412AIFE#TRPBF?
LTC3412AIFE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3412AIFE#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 LTC3412AIFE#TRPBF?
For technical support, including LTC3412AIFE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3412AIFE#TRPBF requirements.
6.How does Aetrix verify that LTC3412AIFE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3412AIFE#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 LTC3412AIFE#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3412AIFE#TRPBF?
All LTC3412AIFE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3412AIFE#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 LTC3412AIFE#TRPBF part is unused and in its original packaging.
Return procedure for LTC3412AIFE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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