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Analog Devices Inc. LTC3412AEFE#TRPBF
- Part No.:
- LTC3412AEFE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LTC3412AEFE#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 3A 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,406
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Product details
Overview
LTC3412AEFE#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 LTC3412AEFE#TRPBF datasheet, LTC3412AEFE#TRPBF pinout, LTC3412AEFE#TRPBF application, or LTC3412AEFE#TRPBF equivalent, key selection criteria include its 64µA quiescent current in Burst Mode, ±2% output voltage accuracy, 100% duty cycle low-dropout capability, power-good monitoring, and thermal protection - all in a 16-lead TSSOP with exposed pad.
Technical Context
The LTC3412AEFE#TRPBF employs constant-frequency current-mode architecture with OPTI-LOOP® compensation for optimized transient response across load and output capacitor variations. Its dual-MOSFET synchronous rectification eliminates external Schottky diodes and enables high efficiency down to light loads.
It supports three operational modes via SYNC/MODE pin: forced continuous (reduced EMI), Burst Mode® with adjustable clamp (64µA IQ), and pulse-skipping (grounded clamp). Frequency is set by RT resistor or synchronized externally from 300kHz to 4MHz, with 110ns minimum on-time limiting practical duty-cycle range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.25V to 5.5V - supports single-cell Li-ion, USB, and intermediate bus rails without pre-regulation. |
| Output Current | Up to 3A - sufficient for CPU core, GPU, or FPGA I/O rail regulation in portable systems. |
| Switching Frequency | 300kHz to 4MHz - enables compact magnetics; 4MHz operation allows <1µH inductors in space-constrained designs. |
| Feedback Reference | 0.8V ±2% - permits precise low-voltage outputs (e.g., 0.8V, 1.0V, 1.2V) with standard resistor dividers. |
| Quiescent Current | 64µA in Burst Mode - extends battery runtime in always-on subsystems like real-time clocks or sensors. |
| RDS(ON) | 77mΩ (P-FET) / 65mΩ (N-FET) - minimizes conduction loss at full load; measured at TJ = 25°C, ISW = ±1A. |
| Power Good Accuracy | ±7.5% window - provides reliable system-level power sequencing and fault detection for downstream logic. |
Pinout & Package
Package: 16-lead plastic TSSOP with exposed pad (FE package); θJA = 38°C/W, θJC = 10°C/W; exposed pad (Pin 17) is SGND and must be soldered to PCB for thermal and electrical performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SVIN (Pin 1, 11) | Signal Input Supply | Provides bias for internal circuitry; requires local 0.1µF decoupling to SGND to stabilize reference and error amplifier. |
| PGOOD (Pin 2, 12) | Open-Drain Power Good Monitor | Asserts low when VOUT deviates >±7.5%; used for system enable/disable sequencing and fault reporting. |
| ITH (Pin 3, 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, 14) | Feedback Input | Compares resistive divider output against 0.8V reference; determines 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; external clock → synchronization (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 during startup. |
| SGND (Pin 8, 2) | Signal Ground | Reference for all analog circuitry; must connect to PGND at single point near PGND pins to avoid noise coupling. |
| PVIN (Pins 9, 16) | Power Input Supply | High-current VIN path; requires low-ESR bulk capacitor (e.g., 100µF ×2) close to pins to suppress switching transients. |
| SW (Pins 10, 11, 14, 15) | Switch Node | Connects to inductor; carries high di/dt square wave; layout must minimize loop area to reduce EMI and voltage spikes. |
| PGND (Pins 12, 13) | Power Ground | Return path for high-current switches; must be solid copper plane connected directly to CIN/COUT negatives. |
Key Features
| Feature | Design Value |
|---|---|
| OPTI-LOOP® Compensation | Allows stable loop response across wide output capacitor ESR and capacitance ranges - no external compensation tuning required for most ceramic cap selections. |
| Selectably Forced Continuous/Burst Mode® | Enables EMI-sensitive applications (continuous) or ultra-low-power standby (Burst), with user-adjustable burst clamp voltage to balance ripple vs. efficiency. |
| 100% Duty Cycle Operation | Maintains regulation as input drops to VOUT + IOUT × RDS(ON) - critical for battery-powered systems nearing end-of-discharge. |
| Internal Synchronous MOSFETs | Eliminates external Schottky diode and associated losses - improves full-load efficiency by ~3–5% versus asynchronous alternatives. |
| Overtemperature Protection | Thermal shutdown activates at TJ = 125°C; auto-recovery after cooldown - prevents permanent damage under sustained overload or poor heatsinking. |
Applications
| Point-of-Load Regulation | Notebook Computers |
|---|---|
Use Scenario: Regulating 1.2V/3A CPU core voltage from 3.3V intermediate bus in ultraportable notebooks. IC Role / Device Role / Timing Role: Primary synchronous buck controller managing dynamic load steps up to 3A/µs while maintaining <±1% output deviation. Use Value: 95% peak efficiency and 64µA Burst Mode IQ extend active battery life by >12% versus legacy controllers; 4MHz capability shrinks inductor volume by 60%. | Use Scenario: Powering DDR3/DDR4 memory I/O rails (1.5V/1.35V) with tight transient response requirements. IC Role / Device Role / Timing Role: Secondary buck regulator responding to memory controller burst activity with sub-20µs recovery from 0A→3A load steps. Use Value: OPTI-LOOP® ensures stable response with low-ESR ceramic output caps; PGOOD signal coordinates memory initialization sequence with SoC boot. |
| Portable Instruments | Distributed Power Systems |
Use Scenario: Supplying 3.3V/2A analog front-end (AFE) and microcontroller in handheld test equipment. IC Role / Device Role / Timing Role: Main system regulator enabling clean analog supply with low 20mVpp ripple in forced continuous mode during measurement cycles. Use Value: Low RDS(ON) MOSFETs and 0.8V reference ensure accurate 3.3V output even at 2.5V input; 100% duty cycle sustains operation during battery sag. | Use Scenario: Providing isolated 2.5V/3A rails to multiple sensor nodes in industrial IoT gateway. IC Role / Device Role / Timing Role: Local DC/DC converter per node, synchronized via shared clock to avoid beat frequencies in dense deployments. Use Value: SYNC/MODE pin enables deterministic 1MHz synchronization across 12+ nodes - eliminating EMI stacking and simplifying 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 |
|---|---|---|---|
| TPS543320RHLT | 3A, 2.7–16V input, 4mm × 4mm QFN, integrated FETs with 12mΩ/8mΩ RDS(ON); requires external compensation. | Better suited for higher-input industrial rails (>5.5V); lacks Burst Mode - higher light-load IQ (120µA). | Choose for >5.5V inputs or where lower conduction loss outweighs IQ penalty; not drop-in due to different pinout and compensation scheme. |
| MP2332HGTL-Z | 3A, 4.5–24V input, 3mm × 3mm QFN, 75mΩ/50mΩ RDS(ON), fixed 500kHz/1MHz freq; no SYNC or adjustable Burst clamp. | Targeted at 12V intermediate bus; no low-VIN support (<4.5V) or fine-grained light-load optimization. | Use where input is ≥4.5V and simplicity trumps configurability; incompatible with 2.25–3.3V battery inputs or precision ripple control. |
Compared with TPS543320RHLT and MP2332HGTL-Z, the LTC3412AEFE#TRPBF uniquely supports ultra-low 2.25V input, offers user-adjustable Burst clamp for ripple/efficiency trade-off, and delivers best-in-class 64µA IQ - making it optimal for battery-critical portable designs where other alternatives fall short in voltage range or light-load behavior.
Availability
LTC3412AEFE#TRPBF is available at Aetrix Electronics and suitable for point-of-load regulation, notebook computers, and portable instruments requiring stable component supply, long-term lifecycle assurance, and guaranteed -40°C to +125°C operation.
Supply support for LTC3412AEFE#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 product line delivers high-efficiency, high-frequency monolithic synchronous buck regulators optimized for space-constrained, battery-powered applications demanding low IQ, wide input range, and robust transient response.
FAQ
What is the maximum output current capability of the LTC3412AEFE#TRPBF?
The LTC3412AEFE#TRPBF is rated for up to 3A continuous output current under typical thermal conditions (θJA = 38°C/W, 2-layer board, 1-in² copper). Peak current limit is 4.5A to 6A depending on junction temperature and input voltage. Derating is required above 85°C ambient or with limited PCB copper area.
Does the LTC3412AEFE#TRPBF support external frequency synchronization?
Yes, the LTC3412AEFE#TRPBF supports external synchronization via the SYNC/MODE pin. An external clock signal from 300kHz to 4MHz can be applied to this pin to lock switching frequency, with the internal oscillator resistor (RT) set to ~25% lower than the sync frequency. During sync, burst clamp defaults to 0V.
What is the purpose of the ITH pin on the LTC3412AEFE#TRPBF?
On the LTC3412AEFE#TRPBF, the ITH pin serves as the error amplifier output and current comparator threshold control node. Its voltage (0.2V–1.4V) directly sets the peak inductor current limit and influences loop stability. It is also monitored by the burst comparator to enable/disable sleep mode in Burst Mode operation.
Can the LTC3412AEFE#TRPBF operate with an input voltage as low as 2.25V?
Yes, the LTC3412AEFE#TRPBF is fully specified to operate from 2.25V to 5.5V input. At 2.25V, it maintains regulation down to VOUT + IOUT × RDS(ON) and supports 100% duty cycle. RDS(ON) increases slightly at low VIN, so thermal design must account for higher conduction loss.
How does the PGOOD pin function on the LTC3412AEFE#TRPBF?
The PGOOD pin on the LTC3412AEFE#TRPBF is an open-drain output that pulls low when the regulated output voltage deviates by more than ±7.5% from the target. It remains high-impedance otherwise. A pull-up resistor to any valid logic supply (e.g., 3.3V) is required to generate a logic-high signal indicating proper regulation.
LTC3412AEFE#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
LTC3412AEFE#TRPBF FAQ
1.How can I place an order for LTC3412AEFE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3412AEFE#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 LTC3412AEFE#TRPBF reliable?
The price and inventory of LTC3412AEFE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3412AEFE#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3412AEFE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3412AEFE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3412AEFE#TRPBF?
LTC3412AEFE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3412AEFE#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 LTC3412AEFE#TRPBF?
For technical support, including LTC3412AEFE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3412AEFE#TRPBF requirements.
6.How does Aetrix verify that LTC3412AEFE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3412AEFE#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 LTC3412AEFE#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3412AEFE#TRPBF?
All LTC3412AEFE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3412AEFE#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 LTC3412AEFE#TRPBF part is unused and in its original packaging.
Return procedure for LTC3412AEFE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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