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Analog Devices Inc. LTC3412EUF
- Part No.:
- LTC3412EUF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-WQFN Exposed Pad
- Datasheet:
-
LTC3412EUF.pdf
- Description:
- IC REG BUCK ADJ 2.5A 16QFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,310
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Product details
Overview
LTC3412EUF from Analog Devices (formerly Linear Technology) is a monolithic synchronous step-down DC/DC regulator delivering up to 2.5A at adjustable output voltages from 0.8V to 5V, operating from 2.625V–5.5V input. It features 85mΩ P-channel and 65mΩ N-channel internal MOSFETs, programmable 300kHz–4MHz switching frequency, and OPTI-LOOP® compensation for stable transient response in portable power systems.
For engineers reviewing the LTC3412EUF datasheet, LTC3412EUF pinout, LTC3412EUF application, or LTC3412EUF equivalent, key selection considerations include its 16-pin 4mm × 4mm QFN package with exposed thermal pad, selectable Burst Mode®/forced continuous operation, ±2% output voltage accuracy, 62µA quiescent current in sleep mode, and integrated power good monitoring.
Technical Context
The LTC3412EUF employs constant-frequency current-mode control with internal slope compensation to prevent subharmonic oscillation above 40% duty cycle. Its dual-MOSFET architecture enables 100% duty-cycle low-dropout operation and eliminates external Schottky diodes.
Control logic supports three distinct operating modes: forced continuous (SYNC/MODE tied to SVIN), Burst Mode® (SYNC/MODE biased 0–1V), or pulse-skipping (SYNC/MODE grounded). The ITH pin serves as both error amplifier output and burst comparator threshold reference, while VFB maintains regulation via a precise 0.8V internal reference.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.625V to 5.5V - supports single-cell Li-ion, Li-polymer, and regulated 3.3V/5V rails without external LDO pre-regulation. |
| Output Current | Up to 2.5A - sufficient for powering core logic, FPGAs, or high-speed interfaces in space-constrained portable designs. |
| Switching Frequency | 300kHz to 4MHz - enables compact magnetics and ceramic capacitors; 4MHz operation reduces inductor size to ~0.47µH typical. |
| Quiescent Current | 62µA in Burst Mode sleep - extends battery runtime in always-on sensor nodes or standby subsystems. |
| Output Voltage Accuracy | ±2% over line, load, and temperature - ensures reliable operation of voltage-sensitive processors and memory. |
| RDS(ON) (P-FET/N-FET) | 85mΩ / 65mΩ - minimizes conduction loss at full load; enables >95% peak efficiency at 2.5A/2.5V output. |
| Power Good Threshold | ±7.5% of VOUT - provides deterministic system-level power sequencing and fault detection without external comparators. |
Pinout & Package
Package: 16-lead (4mm × 4mm) plastic QFN with exposed thermal pad (Pin 17 = SGND). Requires soldering of exposed pad to PCB for thermal performance and electrical grounding.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| RUN/SS (Pin 1) | Enable & soft-start control | Logic-high (>0.65V) enables regulation; capacitor to ground sets output ramp time; <0.5V forces shutdown (<1µA IQ). |
| SGND (Pin 2) | Signal ground reference | Reference for feedback, compensation, and control circuitry; must connect to PGND at single point near CIN/COUT. |
| PVIN (Pins 3, 10) | Main power input | High-current path for input supply; requires local low-ESR decoupling to PGND. |
| SW (Pins 4, 5, 8, 9) | Switch node | Drain connection of internal P-FET and N-FET; drives external inductor; high dv/dt node requiring tight layout. |
| PGOOD (Pin 12) | Open-drain status monitor | Pulled low when VOUT deviates >±7.5%; used for system power sequencing or fault flagging. |
| SVIN (Pin 11) | Signal supply input | Provides bias for control circuitry; typically tied to PVIN but may be isolated for noise-sensitive applications. |
| ITH (Pin 13) | Error amplifier output | Controls peak inductor current; also monitored by burst comparator to enter/exit sleep mode. |
| VFB (Pin 14) | Feedback input | Compares resistive divider output against 0.8V reference to regulate VOUT. |
| RT (Pin 15) | Oscillator timing resistor | Resistor to ground sets fSW; 309kΩ yields ~1MHz; supports synchronization when used with external clock. |
| SYNC/MODE (Pin 16) | Mode selection & sync input | 0–1V: Burst Mode clamp level; SVIN: forced continuous; external clock: synchronization (300kHz–4MHz). |
Key Features
| Feature | Design Value |
|---|---|
| OPTI-LOOP® compensation | Allows loop stability optimization across wide output capacitance range (10µF–100µF) and load conditions without external component changes. |
| 100% duty-cycle operation | Enables ultra-low dropout during battery brownout; maintains regulation down to VIN ≈ VOUT + ILOAD × RDS(ON). |
| Selectable Burst Mode® | Reduces light-load quiescent current to 62µA while maintaining output regulation-critical for IoT endpoint battery life. |
| Adjustable burst clamp | External voltage on SYNC/MODE pin directly programs minimum peak inductor current (0–3.75A), enabling trade-off between ripple and efficiency. |
| Integrated power good | Eliminates need for external supervisor IC; provides fail-safe indication of output regulation status for host processor or PMIC coordination. |
Applications
| Portable Instruments | Battery-Powered Equipment |
|---|---|
Use Scenario: Handheld multimeters, portable oscilloscopes, and field-deployable sensors requiring long battery life and stable 1.8V/3.3V rails. IC Role / Device Role / Timing Role: Primary buck regulator supplying microcontroller core voltage and analog front-end bias. Use Value: 62µA quiescent current in Burst Mode® extends alkaline/Li-ion battery life by >3× versus forced-continuous alternatives at µA-level loads. | Use Scenario: Wireless headsets, smart wearables, and portable medical monitors powered by single-cell Li-polymer batteries. IC Role / Device Role / Timing Role: System power manager converting 3.7V nominal battery to regulated 1.2V CPU core and 3.3V peripheral rail. Use Value: 100% duty-cycle operation sustains regulation down to 2.8V battery voltage, maximizing usable capacity before shutdown. |
| Notebook Computers | Distributed Power Systems |
Use Scenario: Sub-5W auxiliary rails for SSD controllers, USB-C PD interface logic, or embedded security modules in ultrabooks. IC Role / Device Role / Timing Role: Secondary synchronous buck converter generating clean, low-noise 1.1V or 1.8V from main 5V rail. Use Value: Forced continuous mode eliminates low-frequency ripple, preventing interference with high-speed serial links (e.g., PCIe Gen3, USB 3.2). | Use Scenario: Point-of-load conversion in industrial gateways, telecom line cards, or automotive domain controllers requiring localized 2.5V/3.3V supplies. IC Role / Device Role / Timing Role: High-efficiency, thermally robust POL regulator with integrated thermal shutdown and overtemperature protection. Use Value: Use Value: Exposed-pad QFN package achieves θJA = 34°C/W, enabling 2.5A operation at 85°C ambient without heatsink. |
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 |
|---|---|---|---|
| TPS62864DLCR | 4MHz max fSW, 2A output, 1.8V–5.5V input, 12-pin 2mm × 2mm WSON; no SYNC/MODE pin-uses I2C for mode control. | Requires digital interface for Burst Mode® configuration; lacks adjustable burst clamp and PGOOD open-drain output. | Preferred where board space is critical and I2C bus is available; not drop-in for analog mode control or discrete PGOOD signaling. |
| MP2315GJ-Z | 2A output, 4.5V–24V input, 8-pin TSOT23; external compensation, no PGOOD, no Burst Mode®-only forced continuous. | Designed for higher-input industrial rails; lacks low-IQ sleep mode and precision feedback reference (±2.5% vs ±2%). | Valid for cost-sensitive 12V/24V intermediate bus conversion but unsuitable for battery-powered systems requiring ultra-low IQ or tight VOUT tolerance. |
Compared with TPS62864DLCR and MP2315GJ-Z, the LTC3412EUF uniquely combines 2.5A capability, 2.625V–5.5V input range, analog-selectable Burst Mode®, and ±2% output accuracy in a thermally optimized QFN-making it optimal for high-performance portable power where analog control simplicity and battery longevity are prioritized.
Availability
LTC3412EUF is available at Aetrix Electronics and suitable for portable instruments, battery-powered equipment, and notebook computers requiring stable component supply, long-term lifecycle support, and guaranteed parametric performance across –40°C to 125°C junction temperature.
Supply support for LTC3412EUF 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. (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing technologies, serving industrial, automotive, communications, and healthcare markets.
The LTC3412EUF belongs to ADI's Power by Linear™ family of high-efficiency DC/DC converters, engineered specifically for space-constrained, battery-sensitive applications demanding low quiescent current, wide input range, and robust thermal performance.
FAQ
What is the maximum output current capability of the LTC3412EUF?
The LTC3412EUF delivers up to 2.5A of continuous output current under typical thermal conditions (θJA = 34°C/W, TA = 25°C, 4-layer PCB with exposed pad soldered). Derating is required at elevated ambient temperatures or with reduced copper area; full 2.5A is sustained up to 85°C ambient with proper thermal design. Peak current limit is 4A–5.4A, protecting against short-circuit events.
How does the LTC3412EUF achieve high efficiency at light loads?
The LTC3412EUF achieves high light-load efficiency through Burst Mode® operation, which reduces quiescent current to 62µA by disabling internal circuitry and holding both MOSFETs off during sleep periods. The burst clamp voltage on the SYNC/MODE pin sets the minimum peak inductor current, allowing designers to balance output ripple against efficiency-enabling >85% efficiency at 1mA load.
Can the LTC3412EUF operate with an input voltage below 3V?
Yes, the LTC3412EUF operates from 2.625V to 5.5V input, making it compatible with single-cell Li-ion (2.7V–4.2V), Li-polymer, and NiMH batteries. At low input voltages near 2.625V, RDS(ON) increases slightly, so thermal design must ensure junction temperature remains ≤125°C-especially during 100% duty-cycle dropout operation.
What is the function of the exposed pad (Pin 17) on the LTC3412EUF QFN package?
The exposed pad (Pin 17) on the LTC3412EUF is electrically connected to SGND and must be soldered to a dedicated PCB copper pour for optimal thermal dissipation and signal integrity. It reduces θJA from ~60°C/W (no pad connection) to 34°C/W, enabling higher output current capability and improved EMI performance by providing low-inductance return paths for high-frequency switching currents.
Does the LTC3412EUF support external frequency synchronization?
Yes, the LTC3412EUF supports external clock synchronization via the SYNC/MODE pin, accepting input frequencies from 300kHz to 4MHz. When synchronized, the internal oscillator disables and switching cycles align to the falling edge of the external clock. The RT resistor should be selected for a free-running frequency ~25% lower than the sync frequency to ensure reliable locking.
LTC3412EUF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-WQFN Exposed Pad
- Packaging:
- Tube
- Product Status:
- Obsolete
- 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 ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-QFN (4x4)
LTC3412EUF FAQ
1.How can I place an order for LTC3412EUF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3412EUF 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 LTC3412EUF reliable?
The price and inventory of LTC3412EUF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3412EUF is usually 5 days.
3.What payment methods are accepted for LTC3412EUF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3412EUF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3412EUF?
LTC3412EUF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3412EUF 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 LTC3412EUF?
For technical support, including LTC3412EUF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3412EUF requirements.
6.How does Aetrix verify that LTC3412EUF is sourced from the original manufacturer or authorized distributors?
All LTC3412EUF 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 LTC3412EUF meets industry standards.
7.What is the process for return or replacement of LTC3412EUF?
All LTC3412EUF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3412EUF, 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 LTC3412EUF part is unused and in its original packaging.
Return procedure for LTC3412EUF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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