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Analog Devices Inc. LTC3412EFE#PBF
- Part No.:
- LTC3412EFE#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LTC3412EFE#PBF.pdf
- Description:
- IC REG BUCK ADJ 2.5A 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,689
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Product details
Overview
LTC3412EFE#PBF from Analog Devices is a monolithic synchronous step-down DC/DC regulator delivering up to 2.5A output current at adjustable 0.8V–5V with 85mΩ P-channel and 65mΩ N-channel internal MOSFETs, operating from 2.625V–5.5V input and supporting 300kHz–4MHz switching frequency via external resistor or external clock synchronization - used in notebook computers and portable instrumentation for high-efficiency power conversion.
For engineers reviewing the LTC3412EFE#PBF datasheet, LTC3412EFE#PBF pinout, LTC3412EFE#PBF application, or LTC3412EFE#PBF equivalent, key selection criteria include verified 2.5A continuous output capability, ±2% output voltage accuracy over temperature, OPTI-LOOP® compensation for transient optimization, Burst Mode® vs forced continuous mode control, and thermal performance in the 16-lead TSSOP package with exposed pad.
Technical Context
The LTC3412EFE#PBF implements constant-frequency current-mode control with dual internal MOSFETs (P-ch RDS(ON) = 85mΩ, N-ch RDS(ON) = 65mΩ), 0.8V reference, and programmable peak current limit of 4A–5.4A. Its ITH pin controls current comparator threshold across 0.2V–1.4V, enabling precise load-current tracking.
It supports three operational modes via SYNC/MODE pin: forced continuous (SYNC tied to SVIN), Burst Mode® (0V–1V clamp voltage), or external clock synchronization (300kHz–4MHz). Dropout operation at 100% duty cycle maintains regulation down to VOUT + VDS(ON), while OPTI-LOOP® compensation adapts loop response to varying output capacitance and load conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.625V to 5.5V - supports single-cell Li-ion and 3.3V/5V rail inputs without pre-regulation |
| Output Voltage Range | 0.8V to 5V - set by external resistor divider; 0.8V reference enables low-voltage core logic supplies |
| Max Output Current | 2.5A continuous - verified in FE-package thermal environment with θJA = 37.6°C/W |
| Switching Frequency | 300kHz to 4MHz - externally resistor-programmable or synchronizable to external clock |
| Feedback Accuracy | ±2% over temperature - ensures stable regulation across –40°C to 125°C junction range |
| Quiescent Current | 62µA in Burst Mode - extends battery runtime in always-on portable systems |
| Power Good Threshold | ±7.5% output window - open-drain PGOOD signal enables system-level sequencing and fault detection |
Pinout & Package
Package: 16-lead thermally enhanced TSSOP (FE) with exposed SGND pad (Pin 17), rated for –40°C to 125°C operating junction temperature and θJA = 37.6°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SVIN (1,11) | Signal Input Supply | Decoupled supply for control circuitry; must track PVIN within 0.5V to avoid latch-up |
| PGOOD (2,12) | Power Good Monitor | Open-drain output asserting low when VOUT deviates >±7.5% - used for system enable/disable sequencing |
| ITH (3,13) | Error Amplifier Compensation Node | 0.2V–1.4V control voltage setting peak inductor current; critical for loop stability and transient response |
| VFB (4,14) | Feedback Input | Connects to resistor divider; regulates output to 0.8V reference - determines final VOUT accuracy |
| RT (5,15) | Oscillator Timing Input | Resistor-to-ground sets switching frequency; 309kΩ yields ~1MHz per datasheet Figure 1 |
| SYNC/MODE (6,16) | Mode Control & Clock Sync | Selects Burst Mode (0–1V), forced continuous (tied to SVIN), or external sync (300kHz–4MHz) |
| RUN/SS (7,1) | Enable & Soft-Start | <0.5V disables IC; capacitor to ground sets output ramp time - prevents inrush current |
| SGND (8,2) | Signal Ground Reference | Reference for all small-signal pins; connects to PGND at single point to minimize noise coupling |
| PVIN (9,16) | Power Input Supply | Main power path for internal switches; requires local ceramic decoupling to PGND |
| SW (10,11,14,15) | Switch Node | Drain connection of internal P-ch/N-ch MOSFETs; drives external inductor - high di/dt node requiring tight layout |
| PGND (12,13) | Power Ground Return | High-current return path for input/output capacitors and SW node - must be low-inductance plane |
| Exposed Pad (17) | Thermal & Electrical Ground | Must be soldered to PCB SGND plane for thermal dissipation and noise immunity - not optional |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous rectification | Eliminates external Schottky diode; 85mΩ P-ch / 65mΩ N-ch MOSFETs enable >95% peak efficiency |
| OPTI-LOOP® compensation | Allows dynamic loop tuning across wide output capacitor ESR and load ranges - reduces need for iterative board re-spins |
| Burst Mode® with adjustable clamp | External SYNC/MODE voltage sets minimum inductor peak current (0–3.75A), enabling trade-off between ripple and light-load efficiency |
| 100% duty cycle dropout | Maintains regulation as input drops to VOUT + ILOAD × RDS(ON) - critical for battery-powered systems near end-of-discharge |
| Overtemperature protection | Thermal shutdown at TJ = 125°C with automatic recovery - prevents permanent damage during sustained overload |
Applications
| Portable Instruments | Notebook Computers |
|---|---|
Use Scenario: Handheld multimeters and portable oscilloscopes powered by single-cell Li-ion batteries requiring stable 1.8V/3.3V rails under variable load. IC Role / Device Role / Timing Role: Primary buck regulator supplying microcontroller, ADC, and display driver from 3.7V nominal battery. Use Value: 62µA quiescent current in Burst Mode® extends battery life; 100% duty cycle maintains regulation down to 2.8V input. | Use Scenario: Core voltage regulation for Intel/AMD mobile processors in ultrabooks where space and thermal density constrain solution size. IC Role / Device Role / Timing Role: High-current (2.5A) intermediate bus converter stepping 5V down to 1.05V–1.35V for CPU I/O domain. Use Value: 4MHz capability enables use of 0.47µH inductors and 22µF ceramic output caps - reducing footprint by >40% vs 500kHz solutions. |
| Battery-Powered Equipment | Distributed Power Systems |
Use Scenario: Wireless sensor nodes with intermittent RF transmission, requiring ultra-low sleep current and fast wake-up response. IC Role / Device Role / Timing Role: Main system supply regulating 3.3V from 2xAA alkaline stack (up to 3.2V), dynamically adjusting mode based on transmit duty cycle. Use Value: RUN/SS soft-start prevents brownout during wake-up; PGOOD enables MCU reset coordination before firmware execution. | Use Scenario: Industrial PLC I/O modules needing isolated 5V/3.3V rails derived from 24V backplane with strict EMI limits. IC Role / Device Role / Timing Role: Non-isolated point-of-load regulator synchronized to system clock to avoid beat frequencies in sensitive analog sections. Use Value: External clock synchronization (300kHz–4MHz) eliminates switching noise peaks in narrowband measurement bands. |
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 |
|---|---|---|---|
| LTC3630AIFE#PBF | Higher 4A output current, 3mm × 4mm QFN, fixed 3.3V/5V options only - no adjustable VOUT below 0.6V | Best for fixed-output, higher-current designs where board space is constrained and adjustable feedback not required | Select when ≥4A output and smallest footprint are prioritized over 0.8V programmability and TSSOP compatibility |
| TPS54227PWPR | TI part with 2.2A rating, 600kHz–1.8MHz range, integrated BOOT capacitor - lacks Burst Mode® and adjustable burst clamp | Suitable for cost-sensitive industrial applications where moderate light-load efficiency suffices and external clock sync is unnecessary | Choose when BOM cost reduction outweighs need for sub-100µA quiescent current and fine-grained ripple control |
Compared with LTC3412EFE#PBF, LTC3630AIFE#PBF delivers higher current in smaller QFN but forfeits output adjustability and Burst Mode® flexibility, while TPS54227PWPR offers lower cost and integrated BOOT cap but lacks precision light-load control and PGOOD accuracy.
Availability
LTC3412EFE#PBF is available at Aetrix Electronics and suitable for notebook computers, portable instruments, battery-powered equipment, distributed power systems, and cellular telephones requiring stable component supply with guaranteed long-term manufacturability.
Supply support for LTC3412EFE#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 semiconductor leader specializing in high-performance analog, mixed-signal, and power management ICs for precision, reliability, and efficiency-critical applications.
The LTC3412EFE#PBF belongs to the Linear Technology µModule® and monolithic regulator product line, designed specifically for compact, high-efficiency DC/DC conversion in space-constrained portable and battery-operated systems.
FAQ
What is the maximum guaranteed output current for LTC3412EFE#PBF?
The LTC3412EFE#PBF is specified for up to 2.5A continuous output current in the 16-lead TSSOP package under thermal conditions defined in the datasheet (θJA = 37.6°C/W, TA ≤ 85°C). This rating assumes proper PCB layout with the exposed pad soldered to an adequate copper area for heat dissipation. Peak current limit is 4A–5.4A, but sustained 2.5A operation requires attention to ambient temperature and airflow.
Does LTC3412EFE#PBF support external clock synchronization?
Yes, the LTC3412EFE#PBF supports external clock synchronization via the SYNC/MODE pin, accepting input frequencies from 300kHz to 4MHz. When synchronized, the internal oscillator locks to the external clock's falling edge, and burst clamp is automatically set to 0V. The RT resistor should be selected for a frequency 25% lower than the sync source to ensure reliable locking - confirmed in the LTC3412 datasheet Figure 16 and Applications Information section.
What is the purpose of the exposed pad on LTC3412EFE#PBF?
The exposed pad (Pin 17) on the LTC3412EFE#PBF is electrically connected to SGND and serves dual thermal and electrical functions. It must be soldered to a PCB copper plane to achieve the specified θJA = 37.6°C/W and prevent junction temperature exceedance. Leaving it unconnected degrades thermal performance by >25°C/W and risks instability due to ground bounce on sensitive analog nodes like VFB and ITH.
How does Burst Mode® operation affect output voltage ripple in LTC3412EFE#PBF?
In Burst Mode®, output voltage ripple of the LTC3412EFE#PBF is directly controlled by the voltage applied to the SYNC/MODE pin: higher clamp voltages (0.2V–1V) increase minimum inductor peak current, extending burst pulse duration and raising ripple amplitude. At 0V clamp (pulse-skipping), ripple is minimized but light-load efficiency decreases. Datasheet Figure G20 shows IBURST vs clamp voltage, and G01–G03 confirm ripple trade-offs across load and frequency.
Can LTC3412EFE#PBF operate with input voltage below 2.625V?
No, the LTC3412EFE#PBF has a minimum input voltage specification of 2.625V per Absolute Maximum Ratings and Electrical Characteristics tables. Operation below this level is not guaranteed and may result in failure to regulate, increased RDS(ON), or erratic PGOOD behavior. The undervoltage lockout threshold is 2.375V–2.625V, meaning the device will shut down before reaching 2.625V - so sustained operation requires VIN ≥ 2.625V.
LTC3412EFE#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-TSSOP (0.173", 4.40mm Width) 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):
- 2.625V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 0.8V
- Voltage - Output (Max):
- 5V
- Current - Output:
- 2.5A
- Frequency - Switching:
- 300kHz ~ 4MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-TSSOP-EP
LTC3412EFE#PBF FAQ
1.How can I place an order for LTC3412EFE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3412EFE#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 LTC3412EFE#PBF reliable?
The price and inventory of LTC3412EFE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3412EFE#PBF is usually 5 days.
3.What payment methods are accepted for LTC3412EFE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3412EFE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3412EFE#PBF?
LTC3412EFE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3412EFE#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 LTC3412EFE#PBF?
For technical support, including LTC3412EFE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3412EFE#PBF requirements.
6.How does Aetrix verify that LTC3412EFE#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3412EFE#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 LTC3412EFE#PBF meets industry standards.
7.What is the process for return or replacement of LTC3412EFE#PBF?
All LTC3412EFE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3412EFE#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 LTC3412EFE#PBF part is unused and in its original packaging.
Return procedure for LTC3412EFE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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