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Analog Devices Inc. LTC3412EUF#PBF
- Part No.:
- LTC3412EUF#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-WQFN Exposed Pad
- Datasheet:
-
LTC3412EUF#PBF.pdf
- Description:
- IC REG BUCK ADJ 2.5A 16QFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,050
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Product details
Overview
LTC3412EUF#PBF from Analog Devices is a monolithic synchronous step-down DC/DC regulator delivering up to 2.5A at adjustable 0.8V–5V output, operating from 2.625V–5.5V input with 85mΩ P-channel and 65mΩ N-channel internal MOSFETs, 4MHz max switching frequency, and 62µA quiescent current in Burst Mode - used in portable instruments and battery-powered systems.
For engineers reviewing the LTC3412EUF#PBF datasheet, LTC3412EUF#PBF pinout, LTC3412EUF#PBF application, or LTC3412EUF#PBF equivalent, key selection considerations include its 16-lead 4mm × 4mm QFN package, OPTI-LOOP® compensation for transient optimization, selectable Burst Mode® vs forced continuous operation, ±2% output voltage accuracy, and 100% duty cycle low-dropout capability.
Technical Context
The LTC3412EUF#PBF implements constant-frequency current-mode control with dual internal MOSFETs (P-ch RDS(ON) = 85mΩ, N-ch RDS(ON) = 65mΩ), programmable switching frequency (300kHz–4MHz via RT resistor or external clock sync), and ITH-based peak current regulation. Its error amplifier compares VFB against a 0.8V reference to adjust switching duty cycle.
It supports three operational modes: forced continuous (low-noise), Burst Mode® (62µA IQ, adjustable burst clamp via SYNC/MODE pin), and pulse-skipping (SYNC/MODE = GND). Dropout operation uses 100% duty cycle with P-FET conduction, while OPTI-LOOP® compensation adapts loop response across load and capacitor variations.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.625V to 5.5V - supports single-cell Li-ion and dual-cell NiMH battery inputs without pre-regulation. |
| Output Voltage Range | 0.8V to 5V (adjustable) - enables core voltage scaling for microcontrollers and FPGAs down to sub-1V logic rails. |
| Max Output Current | 2.5A - sufficient for powering high-performance DSPs, RF transceivers, or multi-core SoCs in portable designs. |
| Switching Frequency | 300kHz to 4MHz - allows trade-off between small passive size (high-freq) and efficiency (low-freq), with external sync support. |
| Quiescent Current | 62µA in Burst Mode - extends runtime in standby/sleep states of battery-operated equipment. |
| Output Accuracy | ±2% over line/load/temp - ensures stable power delivery to precision analog circuits and ADC references. |
| RDS(ON) (P-FET/N-FET) | 85mΩ / 65mΩ - reduces conduction loss and thermal rise at full load, enabling compact thermal design in QFN package. |
Pinout & Package
Package: 16-lead (4mm × 4mm) plastic QFN with exposed thermal pad (Pin 17 = SGND), rated for –40°C to 125°C junction temperature, θJA = 34°C/W.
| 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 and prevents inrush. |
| SGND (Pin 2) | Signal ground reference | Reference for feedback, compensation, and control circuitry; must connect to PGND at single point. |
| PVIN (Pins 3,10) | Main power input | High-current input node requiring local low-ESR ceramic decoupling to PGND. |
| SW (Pins 4,5,8,9) | Switch node | Connects to inductor; carries high di/dt square wave - requires short, low-inductance PCB routing. |
| PGND (Pins 6,7) | Power ground return | Low-impedance return path for PVIN, SW, and output capacitor - must tie to exposed pad. |
| SVIN (Pins 11,1) | Signal supply input | Decoupled supply for internal logic; kept within 0.5V of PVIN to avoid overstress on internal LDO. |
| PGOOD (Pin 12) | Power-good monitor | Open-drain output pulled low if VOUT deviates >±7.5% - used for system sequencing and fault reporting. |
| ITH (Pin 13) | Error amplifier output | Controls peak inductor current; voltage range 0.2V–1.4V maps to zero-to-max current limit. |
| VFB (Pin 14) | Feedback input | Monitors resistive divider output; regulates VOUT to 0.8V reference - sets output via R1/R2 ratio. |
| RT (Pin 15) | Oscillator timing input | Resistor to ground sets fSW; 309kΩ yields ~1MHz - enables precise frequency tuning or EMI reduction. |
| SYNC/MODE (Pin 16) | Mode select & sync input | Tied to SVIN → forced continuous; 0–1V → adjustable Burst Mode; external clock → sync mode (300kHz–4MHz). |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous rectification | Eliminates external Schottky diode, improving efficiency by 3–5% and reducing board area and thermal stress. |
| OPTI-LOOP® compensation | Allows dynamic loop bandwidth adjustment across wide output capacitor types (ceramic, polymer, tantalum) without redesign. |
| Adjustable Burst Mode clamp | External SYNC/MODE voltage sets minimum inductor peak current (0–3.75A), enabling ripple/noise vs efficiency trade-off. |
| 100% duty cycle dropout | Maintains regulation as VIN approaches VOUT - critical for maximizing battery utilization in portable systems. |
| Thermally enhanced QFN | Exposed pad (Pin 17 = SGND) provides low-θJC = 1°C/W path - enables 2.5A operation without heatsink in compact layouts. |
Applications
| Portable Instruments | Battery-Powered Equipment |
|---|---|
Use Scenario: Handheld multimeters, portable oscilloscopes, and gas analyzers operating from 2–3 cell Li-ion packs. IC Role / Device Role / Timing Role: Primary step-down regulator converting 3.6V nominal battery to 1.2V/3.3V rails for MCU, ADC, and display drivers. Use Value: 62µA Burst Mode IQ extends battery life >2× versus continuous-mode alternatives; 100% duty cycle sustains operation until battery reaches 0.8V above regulated output. | Use Scenario: Wireless sensors, BLE beacons, and IoT edge nodes powered by coin cells or small LiPo batteries. IC Role / Device Role / Timing Role: High-efficiency power source for ultra-low-power microcontrollers and RF transceivers during active and sleep cycles. Use Value: Adjustable burst clamp minimizes output ripple during wake-up bursts while maintaining <100µA average system IQ - meeting stringent energy budget targets. |
| Notebook Computers | Distributed Power Systems |
Use Scenario: Core voltage regulation for embedded controllers, USB-C PD interface ICs, and display backlight drivers in thin-clamshell notebooks. IC Role / Device Role / Timing Role: Secondary buck converter supplying 1.8V/2.5V from main 5V rail, with fast transient response for bursty CPU/peripheral loads. Use Value: OPTI-LOOP® compensation ensures stable regulation with low-ESR ceramic capacitors, eliminating need for bulk electrolytics and saving board space. | Use Scenario: Point-of-load (POL) conversion in industrial PLCs, motor drives, and telecom line cards where multiple isolated rails are required. IC Role / Device Role / Timing Role: Local DC/DC stage stepping down intermediate 5V/12V bus to FPGA I/O or analog front-end voltages. Use Value: 4MHz sync capability aligns switching edges across multiple LTC3412EUF#PBF units, reducing conducted EMI peaks and simplifying filter design. |
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 |
|---|---|---|---|
| TPS54227PWPR | Fixed 500kHz fSW, no SYNC input, 2.2A max output, 105mΩ/85mΩ RDS(ON), no adjustable burst clamp | Lower cost for fixed-frequency, lower-current apps; lacks fine-grained noise/efficiency control | Choose when design prioritizes BOM cost over flexibility and peak current capability. |
| MP2315GJ-Z | 3.5A rating, 2.5V–6V input, 340kHz–2.5MHz fSW, no PGOOD or SYNC, 120mΩ/80mΩ RDS(ON) | Higher current but less accurate feedback (±3%), no power-good monitoring or external sync | Prefer when higher output current is needed and system-level fault signaling is handled externally. |
Compared with TPS54227PWPR and MP2315GJ-Z, the LTC3412EUF#PBF offers superior transient response via OPTI-LOOP®, precise ±2% output accuracy, integrated PGOOD, and flexible mode control - making it optimal for high-reliability portable and instrumentation designs where efficiency, noise, and regulation tightness are critical.
Availability
LTC3412EUF#PBF 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 consistent parametric performance across production batches.
Supply support for LTC3412EUF#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 (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and power management semiconductors, serving precision, industrial, automotive, and communications markets.
The LTC3412EUF#PBF belongs to Linear's high-efficiency monolithic DC/DC regulator family, designed specifically for space-constrained, battery-sensitive applications demanding low IQ, wide input range, and robust transient performance.
FAQ
What is the maximum supported switching frequency for the LTC3412EUF#PBF?
The LTC3412EUF#PBF supports a programmable switching frequency from 300kHz to 4MHz. While 4MHz operation is guaranteed by design (not production tested), typical operation at 1MHz with a 309kΩ RT resistor is validated across temperature. Frequencies above 2.5MHz require careful layout to manage gate drive losses and EMI.
Does the LTC3412EUF#PBF require an external Schottky diode?
No, the LTC3412EUF#PBF does not require an external Schottky diode. It integrates synchronous P-channel and N-channel MOSFETs (85mΩ and 65mΩ RDS(ON)) to replace the diode, increasing efficiency by eliminating forward voltage drop and associated conduction loss - especially beneficial at high currents and low output voltages.
How is output voltage programmed on the LTC3412EUF#PBF?
The LTC3412EUF#PBF output voltage is programmed using a resistive divider from VOUT to SGND, connected to the VFB pin. The formula is VOUT = 0.8V × (1 + R2/R1), where R2 connects to VOUT and R1 to SGND. For example, R1 = 10kΩ and R2 = 27.5kΩ yields 3.0V output. VFB regulation tolerance is ±2% over temperature and line/load conditions.
What thermal performance can be expected from the LTC3412EUF#PBF in its QFN package?
The LTC3412EUF#PBF in its 16-lead 4mm × 4mm QFN package has θJA = 34°C/W and θJC = 1°C/W when the exposed pad (Pin 17) is soldered to a ≥1cm² copper pour. At 2.5A output with 3.3V input → 1.2V output, power dissipation is ~350mW, resulting in ~12°C junction-to-ambient rise - well within the 125°C TJMAX limit under typical PCB conditions.
Can the LTC3412EUF#PBF operate with input voltage equal to output voltage?
Yes, the LTC3412EUF#PBF supports 100% duty cycle operation, allowing it to maintain regulation when input voltage drops to within ~100mV above the output voltage (determined by P-FET RDS(ON) and inductor DCR). This low-dropout behavior extends usable battery life in portable systems - for example, sustaining 3.3V output down to ~3.4V input before dropout begins.
LTC3412EUF#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):
- 2.625V
- 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-QFN (4x4)
LTC3412EUF#PBF FAQ
1.How can I place an order for LTC3412EUF#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3412EUF#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 LTC3412EUF#PBF reliable?
The price and inventory of LTC3412EUF#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3412EUF#PBF is usually 5 days.
3.What payment methods are accepted for LTC3412EUF#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3412EUF#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3412EUF#PBF?
LTC3412EUF#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3412EUF#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 LTC3412EUF#PBF?
For technical support, including LTC3412EUF#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3412EUF#PBF requirements.
6.How does Aetrix verify that LTC3412EUF#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3412EUF#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 LTC3412EUF#PBF meets industry standards.
7.What is the process for return or replacement of LTC3412EUF#PBF?
All LTC3412EUF#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3412EUF#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 LTC3412EUF#PBF part is unused and in its original packaging.
Return procedure for LTC3412EUF#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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