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Analog Devices Inc. LTC3412AMPFE#PBF
- Part No.:
- LTC3412AMPFE#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LTC3412AMPFE#PBF.pdf
- Description:
- IC REG BUCK ADJ 3A 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,559
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Product details
Overview
LTC3412AMPFE#PBF from Analog Devices is a high-efficiency monolithic synchronous step-down DC/DC converter with constant-frequency current-mode control, delivering up to 3A output current at 0.8V–5V from a 2.25V–5.5V input. It features programmable switching frequency (300kHz–4MHz), ±2% output voltage accuracy, and low quiescent current (64µA) in Burst Mode operation - ideal for point-of-load regulation in portable instruments and notebook computers.
For engineers reviewing the LTC3412AMPFE#PBF datasheet, LTC3412AMPFE#PBF pinout, LTC3412AMPFE#PBF application, or LTC3412AMPFE#PBF equivalent, key selection considerations include its –55°C to 125°C extended temperature grade, 77mΩ P-channel RDS(ON), OPTI-LOOP® compensation, selectable forced continuous/Burst Mode® operation, and power-good monitoring capability.
Technical Context
The LTC3412AMPFE#PBF implements a current-mode architecture with internal P-channel (77mΩ) and N-channel (65mΩ) synchronous MOSFETs, enabling high efficiency without an external Schottky diode. Its peak-current limit is 4.5A, and it supports 100% duty cycle for low-dropout operation during battery brownout conditions.
Switching frequency is set via an external resistor on the RT pin or synchronized to an external clock (300kHz–4MHz) on SYNC/MODE. The ITH pin provides direct error amplifier compensation control, while OPTI-LOOP® allows transient response optimization across load and output capacitor variations.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.25V to 5.5V - supports single-cell Li-ion, dual-cell NiMH, and 3.3V/5V rail inputs without external LDO pre-regulation. |
| Output Current | Up to 3A - sufficient for FPGA core rails, microprocessor I/O, and ASIC point-of-load applications. |
| Switching Frequency | 300kHz to 4MHz - enables compact magnetics (e.g., 0.47µH inductor at 1MHz) and EMI-aware layout flexibility. |
| RDS(ON) (P-FET) | 77mΩ typical - reduces conduction loss at high load, critical for >90% efficiency at 3A output. |
| Quiescent Current | 64µA in Burst Mode - extends battery runtime in always-on portable instrumentation. |
| Output Voltage Accuracy | ±2% over temperature - ensures stable logic supply margins for 1.2V, 1.8V, 2.5V, and 3.3V systems. |
| Operating Temperature | –55°C to 125°C junction - qualified for extended industrial, avionics, and downhole sensing environments. |
Pinout & Package
Package: 16-Lead Plastic TSSOP with Exposed Pad (FE package); thermal pad must be soldered to SGND for rated θJA = 38°C/W and functional reliability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SVIN (Pin 1, 11) | Signal Input Supply | Provides bias for internal analog circuitry; requires local 0.1µF decoupling to SGND to suppress noise coupling into feedback loop. |
| PGOOD (Pin 2, 12) | Open-Drain Power-Good Monitor | Asserts low when VOUT deviates >±7.5% - used for system sequencing, fault logging, or enabling downstream loads. |
| ITH (Pin 3, 13) | Error Amplifier Compensation Node | Voltage-controlled current limit threshold (0.2V–1.4V range); directly sets peak inductor current and loop stability margin. |
| 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 | Sets switching frequency via ROSC = 3.08×10¹¹/f (Ω); e.g., 294kΩ yields ~1MHz nominal operation. |
| SYNC/MODE (Pin 6, 16) | Mode Select / Clock Sync Input | Tied to SVIN → forced continuous mode; 0–1V → adjustable Burst Mode clamp; external clock input → synchronization. |
| RUN/SS (Pin 7, 1) | Enable / Soft-Start Control | <0.5V disables regulator (<1µA shutdown current); capacitor to ground sets output ramp time and inrush current limiting. |
| SGND (Pin 8, 2) | Signal Ground Reference | Reference for all small-signal pins (VFB, ITH, RT); must connect to PGND at single point to avoid ground bounce in feedback path. |
| PVIN (Pins 9, 16) | Main Power Input | Connects to input bulk capacitor; high di/dt node requiring low-inductance PCB routing and local ceramic decoupling to PGND. |
| SW (Pins 10, 11, 14, 15) | Switch Node | Drain connection of internal P- and N-MOSFETs; drives external inductor; high dv/dt node requiring tight loop area and guard ring. |
| PGND (Pins 12, 13) | Power Ground Return | Return path for high-current switch and input/output capacitors; must be solid copper plane tied to exposed pad. |
| Exposed Pad (Pin 17) | Thermal & Electrical Ground | Internally connected to SGND; mandatory soldering required for thermal performance and EMI reduction. |
Key Features
| Feature | Design Value |
|---|---|
| Burst Mode® with Adjustable Clamp | Enables 64µA quiescent current while allowing external tuning of output ripple via SYNC/MODE voltage (0–1V), balancing efficiency vs. noise in battery-powered systems. |
| OPTI-LOOP® Compensation | Allows dynamic adjustment of loop bandwidth and phase margin via ITH pin, maintaining stability across wide output capacitor ESR ranges (e.g., ceramic vs. polymer). |
| 100% Duty Cycle Low-Dropout Operation | Permits regulation down to VIN – VOUT ≈ IOUT × RDS(ON), extending usable battery life in deep discharge scenarios (e.g., 2.5V out from 2.6V input). |
| Internal Synchronous Power Switches | Eliminates need for external Schottky diode - reduces BOM count, board area, and thermal stress while improving full-load efficiency by ~3–5%. |
| Programmable Frequency & Sync Capability | Supports EMI reduction via spread-spectrum sync or fixed-frequency noise placement; enables multi-rail coordination in dense PCB layouts. |
Applications
| Point-of-Load Regulation | Notebook Computers |
|---|---|
|
Use Scenario: Regulating 1.2V/2A core voltage for an embedded ARM processor in an industrial controller. IC Role / Device Role / Timing Role: Primary synchronous buck regulator providing tightly regulated, low-noise DC supply with fast transient response. Use Value: OPTI-LOOP® compensation maintains stability with low-ESR ceramic output caps; 64µA Burst Mode current minimizes standby power draw. |
Use Scenario: Generating 3.3V/3A for USB-C PD interface and display subsystem in ultra-thin laptop design. IC Role / Device Role / Timing Role: High-current step-down converter operating from 5V USB-C source with forced continuous mode to avoid audible coil whine. Use Value: 4MHz max switching frequency enables <1µH inductor size; 77mΩ RDS(ON) sustains >93% efficiency at full load under thermally constrained chassis. |
| Portable Instruments | Distributed Power Systems |
|
Use Scenario: Powering a handheld multimeter's precision ADC and LCD backlight from two AA cells (2.4–3.2V). IC Role / Device Role / Timing Role: Wide-input buck regulator supporting battery voltage sag while maintaining 2.5V reference rail accuracy. Use Value: –55°C to 125°C MP-grade qualification ensures reliable operation in field-deployed test equipment; 100% duty cycle prevents dropout during cold-start. |
Use Scenario: Local 1.8V/2A supply for FPGA I/O banks in a modular telecom base station card. IC Role / Device Role / Timing Role: Distributed buck converter synchronized to system clock to minimize beat frequencies and EMI coupling between adjacent modules. Use Value: SYNC/MODE pin accepts 3.3V CMOS clock signal; ±2% output accuracy guarantees signal integrity across hot-swappable line cards. |
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, 3.5–28V input, fixed 500kHz freq, no Burst Mode, higher IQ (125µA), QFN-14 package | Requires external diode; lacks adjustable light-load mode and extended temp grade | Preferred for cost-sensitive 12V-input industrial supplies where efficiency at light load is secondary. |
| MP2332HGTL-Z | 3A, 4.5–28V input, 500kHz–2.2MHz sync-capable, 30µA IQ in skip mode, QFN-10 package | Higher minimum input voltage; no 0.8V reference or OPTI-LOOP; unqualified below –40°C | Valid for mid-voltage distributed rails where extended temperature range is not required. |
Compared with LTC3412AMPFE#PBF, TPS54332DR offers lower BOM cost but sacrifices light-load efficiency and temperature range, while MP2332HGTL-Z provides smaller footprint and lower IQ but lacks the precision reference, compensation flexibility, and –55°C qualification essential for mission-critical portable instrumentation.
Availability
LTC3412AMPFE#PBF is available at Aetrix Electronics and suitable for point-of-load regulation, notebook computers, portable instruments, and distributed power systems requiring stable component supply with extended temperature assurance and long-term obsolescence management.
Supply support for LTC3412AMPFE#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, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, founded in 1965 and headquartered in Wilmington, MA.
The LTC3412A belongs to Analog Devices' Power by Linear™ family of high-efficiency DC/DC converters, designed specifically for demanding portable, industrial, and automotive point-of-load applications requiring precision regulation, wide input range, and robust thermal performance.
FAQ
What is the maximum junction temperature rating for the LTC3412AMPFE#PBF?
The LTC3412AMPFE#PBF is tested and guaranteed to operate over a junction temperature range of –55°C to 125°C. This MP-grade qualification includes full electrical testing across the entire range, distinguishing it from E- and I-grade variants limited to –40°C minimum. Thermal design must account for θJA = 38°C/W and mandatory exposed-pad soldering to maintain this rating in actual PCB layouts.
How does the SYNC/MODE pin configure Burst Mode versus forced continuous operation on the LTC3412AMPFE#PBF?
On the LTC3412AMPFE#PBF, tying SYNC/MODE to SVIN forces continuous conduction mode, eliminating pulse skipping for lowest output ripple. Applying 0–1V to SYNC/MODE enables Burst Mode with externally adjustable burst clamp level - higher voltages increase sleep duration and output ripple. Grounding SYNC/MODE selects pulse-skipping mode, where minimum on-time governs light-load behavior. All modes retain full 3A capability.
Can the LTC3412AMPFE#PBF regulate output voltage below 0.8V?
No - the LTC3412AMPFE#PBF uses an internal 0.8V reference, and its feedback architecture requires VOUT ≥ 0.8V. The minimum regulated output is defined by the reference voltage; attempting sub-0.8V operation violates the error amplifier's common-mode input range and results in loss of regulation. For lower outputs, a different regulator with adjustable reference or external reference injection is required.
What is the purpose of the ITH pin on the LTC3412AMPFE#PBF, and how is it used in design?
The ITH pin on the LTC3412AMPFE#PBF is the error amplifier output and peak-current threshold control node. Its voltage (0.2V–1.4V) directly sets the current comparator trip point, governing peak inductor current and loop dynamics. In standard operation, it's left floating for internal compensation; for OPTI-LOOP® tuning, an RC network from ITH to SGND adjusts phase margin and transient response without affecting DC accuracy.
Does the LTC3412AMPFE#PBF support 4MHz switching frequency in production units?
Yes - the LTC3412AMPFE#PBF is designed and characterized for 4MHz operation, though the datasheet notes this frequency is "guaranteed by design and not production tested." Functional validation at 4MHz is confirmed across process corners and temperature extremes; users must ensure layout minimizes parasitic inductance and selects appropriately rated 0.22µH–0.47µH inductors to sustain stable operation.
LTC3412AMPFE#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):
- 2.25V
- 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:
- -55°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-TSSOP-EP
LTC3412AMPFE#PBF FAQ
1.How can I place an order for LTC3412AMPFE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3412AMPFE#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 LTC3412AMPFE#PBF reliable?
The price and inventory of LTC3412AMPFE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3412AMPFE#PBF is usually 5 days.
3.What payment methods are accepted for LTC3412AMPFE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3412AMPFE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3412AMPFE#PBF?
LTC3412AMPFE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3412AMPFE#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 LTC3412AMPFE#PBF?
For technical support, including LTC3412AMPFE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3412AMPFE#PBF requirements.
6.How does Aetrix verify that LTC3412AMPFE#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3412AMPFE#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 LTC3412AMPFE#PBF meets industry standards.
7.What is the process for return or replacement of LTC3412AMPFE#PBF?
All LTC3412AMPFE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3412AMPFE#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 LTC3412AMPFE#PBF part is unused and in its original packaging.
Return procedure for LTC3412AMPFE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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