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Analog Devices Inc. LTC3412AIFE#PBF
- Part No.:
- LTC3412AIFE#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LTC3412AIFE#PBF.pdf
- Description:
- IC REG BUCK ADJ 3A 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,374
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Product details
Overview
LTC3412AIFE#PBF 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 features 77mΩ P-channel and 65mΩ N-channel internal MOSFETs, ±2% output voltage accuracy, and programmable switching frequency (300kHz–4MHz) via external resistor or external clock synchronization. Used in point-of-load regulation for notebook computers and portable instruments.
For engineers reviewing the LTC3412AIFE#PBF datasheet, LTC3412AIFE#PBF pinout, LTC3412AIFE#PBF application, or LTC3412AIFE#PBF equivalent, key selection considerations include its 64µA quiescent current in Burst Mode, selectable forced continuous/Burst Mode® operation with adjustable burst clamp, 100% duty cycle low-dropout capability, Power Good output, and thermal protection - all in a 16-lead TSSOP package with exposed pad.
Technical Context
The LTC3412AIFE#PBF implements constant-frequency current-mode control with OPTI-LOOP® compensation, enabling stable transient response across wide load and output capacitor ranges. Its dual-MOSFET synchronous architecture eliminates external Schottky diode losses and supports high efficiency up to 95%.
It integrates independent peak-current comparators for P-channel (4.5A limit) and N-channel (–1.3A in forced continuous, 0A in Burst Mode) switches, plus reverse-current protection and slope compensation recovery to maintain consistent peak inductor current across duty cycles. The ITH pin serves as both error amplifier output and burst comparator input, enabling dynamic mode transition based on load demand.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 3A continuous - supports high-density point-of-load conversion without external power stage. |
| Input Voltage Range | 2.25V to 5.5V - compatible with single-cell Li-ion, Li-polymer, and 3.3V/5V system rails. |
| Switching Frequency | 300kHz to 4MHz - enables compact magnetics and ceramic capacitors; 4MHz operation supported by design. |
| RDS(ON) (P-FET / N-FET) | 77mΩ / 65mΩ - minimizes conduction loss and improves full-load efficiency without heatsinking. |
| Quiescent Current | 64µA in Burst Mode - extends battery runtime in portable systems during light-load standby. |
| Feedback Reference | 0.8V ±2% - allows precise low-voltage outputs (e.g., 0.8V core supplies) with minimal divider error. |
| Power Good Accuracy | ±7.5% output window - provides reliable system-level rail monitoring for sequencing and fault detection. |
Pinout & Package
Package: 16-lead plastic TSSOP with exposed pad (FE package), rated for –40°C to +125°C junction temperature. Exposed pad must be soldered to PCB for thermal performance and electrical connection to SGND.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SVIN (Pin 1, 11) | Signal Input Supply | Provides bias for control circuitry; decoupled separately from PVIN to minimize noise coupling into feedback loop. |
| PGOOD (Pin 2, 12) | Open-Drain Power Good Monitor | Asserts low when VOUT deviates >±7.5% from regulation - used for system enable/disable sequencing and fault reporting. |
| ITH (Pin 3, 13) | Error Amplifier Output / Burst Comparator Input | Controls peak inductor current threshold; voltage range 0.2V–1.4V determines current limit and enables Burst Mode sleep/wake transitions. |
| VFB (Pin 4, 14) | Feedback Input | Compares resistive-divider output against 0.8V reference to regulate VOUT; leakage <0.2µA preserves accuracy with high-value dividers. |
| RT (Pin 5, 15) | Oscillator Timing Resistor Input | Resistor to ground sets switching frequency per ROSC = 3.08×10¹¹/f − 10kΩ; enables precise frequency tuning or synchronization. |
| SYNC/MODE (Pin 6, 16) | Mode Select / Clock Sync Input | Tied to SVIN → forced continuous; 0–1V → adjustable Burst Mode; external clock (300kHz–4MHz) → synchronized operation. |
| RUN/SS (Pin 7, 1) | Enable / Soft-Start Control | <0.5V disables IC (<1µA shutdown current); capacitor to ground controls output ramp time and inrush 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 (Pin 9, 16) | Main Power Input | Supplies gate drive and high-side switch; requires local low-ESR ceramic decoupling to PGND near IC edge. |
| SW (Pin 10, 11, 14, 15) | Switch Node | Connects to inductor; carries high di/dt square wave - layout critical to minimize EMI and voltage overshoot. |
| PGND (Pin 12, 13) | Power Ground Return | Return path for high-current PVIN and SW paths; must be low-inductance copper plane tied to CIN/COUT negative terminals. |
Key Features
| Feature | Design Value |
|---|---|
| Burst Mode® with Adjustable Clamp | External voltage on SYNC/MODE sets minimum peak inductor current, enabling precise trade-off between output ripple and light-load efficiency. |
| OPTI-LOOP® Compensation | Allows optimization of transient response across wide output capacitance values (e.g., 10µF–220µF ceramics) without loop re-tuning. |
| 100% Duty Cycle Operation | Enables dropout regulation down to VOUT + VDS(ON) × ILOAD, extending usable battery range in portable systems. |
| Slope Compensation Recovery | Maintains constant maximum inductor peak current across duty cycles >40%, preserving output current capability at high VIN/VOUT ratios. |
| Integrated Overtemperature Protection | Thermal shutdown activates at TJ = 125°C; auto-recovery after cooldown prevents latch-up in thermally constrained layouts. |
Applications
| Point-of-Load Regulation | Notebook Computers |
|---|---|
Use Scenario: Regulating 2.5V/3A CPU I/O supply from 3.3V system rail in space-constrained laptop motherboard. IC Role / Device Role / Timing Role: Primary synchronous buck converter providing tightly regulated, low-noise power with fast load-step response. Use Value: 95% efficiency at 3A reduces thermal load; 64µA quiescent current extends battery life during idle states. |
Use Scenario: Generating 1.8V DDR memory supply from 5V adapter input in ultraportable notebook design. IC Role / Device Role / Timing Role: High-frequency (2MHz+) step-down regulator enabling sub-2mm height inductor and compact 0603 ceramic capacitors. Use Value: 4MHz capability allows use of 0.47µH inductors, reducing board area by >30% vs. 500kHz solutions. |
| Portable Instruments | Distributed Power Systems |
Use Scenario: Powering 3.3V FPGA core and 1.2V analog front-end from single 4.2V Li-ion cell in handheld test equipment. IC Role / Device Role / Timing Role: Dual-output capable buck regulator (with external divider) delivering stable, low-ripple rails under dynamic load profiles. Use Value: ±2% output accuracy ensures sensor ADC reference stability; PGOOD enables safe FPGA configuration sequencing. |
Use Scenario: Local 1.5V/3A supply for ASIC cluster in telecom line card with strict EMI limits and thermal constraints. IC Role / Device Role / Timing Role: Synchronized buck converter locked to system clock to eliminate beat frequencies and simplify EMI filtering. Use Value: External clock sync (300kHz–4MHz) eliminates switching harmonics in sensitive RF bands; exposed-pad TSSOP aids thermal management. |
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 |
|---|---|---|---|
| TPS54331DR | 3A, 5.5V max input, fixed 570kHz fSW, no Burst Mode, higher IQ (125µA), no PGOOD | Lacks adjustable light-load mode and rail-monitoring output - less suitable for battery-powered portable instruments. | Choose for cost-sensitive industrial applications where fixed frequency and simpler control suffice. |
| MP2332HG-LL-Z | 3A, 6V max input, 350kHz–2.5MHz fSW, 30µA IQ in skip mode, no SYNC input, different pinout | No external clock sync or adjustable burst clamp - limited flexibility in noise-sensitive or synchronized systems. | Prefer when ultra-low quiescent current is primary requirement and synchronization is unnecessary. |
Compared with TPS54331DR and MP2332HG-LL-Z, the LTC3412AIFE#PBF offers superior light-load efficiency via programmable Burst Mode®, integrated PGOOD for system sequencing, and full-frequency synchronization - making it optimal for portable, high-performance, and thermally constrained designs requiring design flexibility.
Availability
LTC3412AIFE#PBF is available at Aetrix Electronics and suitable for point-of-load regulation, notebook computers, and portable instruments requiring stable component supply, long-term lifecycle support, and guaranteed -40°C to +125°C operation.
Supply support for LTC3412AIFE#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 leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving precision instrumentation, communications, and power management markets.
The LTC3412AIFE#PBF belongs to Analog Devices' Power by Linear™ family of high-efficiency monolithic DC/DC converters, designed specifically for demanding point-of-load applications in portable, industrial, and computing systems where size, efficiency, and thermal performance are critical.
FAQ
What is the operating temperature range for the LTC3412AIFE#PBF?
The LTC3412AIFE#PBF is rated for a junction temperature range of –40°C to +125°C. This I-grade qualification ensures guaranteed performance over the full range, including specified electrical characteristics such as ±2% output voltage accuracy and 64µA quiescent current in Burst Mode. Thermal resistance is θJA = 38°C/W (TSSOP FE package), requiring appropriate PCB copper area on the exposed pad for reliable operation at 3A load.
Does the LTC3412AIFE#PBF support external frequency synchronization?
Yes, the LTC3412AIFE#PBF supports external clock synchronization via the SYNC/MODE pin. An external clock signal in the 300kHz–4MHz range can be applied directly to this pin, locking the internal oscillator to the falling edge of the input clock. When synchronized, the burst clamp is automatically set to 0V, and the oscillator timing resistor should be selected for a frequency ~25% lower than the sync source to ensure reliable capture.
How does Burst Mode® operation work in the LTC3412AIFE#PBF?
In Burst Mode® operation, the LTC3412AIFE#PBF intermittently pulses the power switches at light loads to minimize switching losses. The burst clamp voltage applied to the SYNC/MODE pin sets the minimum peak inductor current. When the ITH voltage falls below ~150mV, the device enters sleep mode, disabling most internal circuitry and reducing quiescent current to 64µA. Output voltage droop reawakens the controller, restarting regulation - a cycle that maintains high efficiency without compromising regulation accuracy.
What is the purpose of the ITH pin on the LTC3412AIFE#PBF?
The ITH pin on the LTC3412AIFE#PBF serves two critical functions: it is the output of the error amplifier (setting peak inductor current threshold) and the input to the burst comparator (enabling sleep/wake decisions). Its voltage (0.2V–1.4V) directly controls current limit magnitude and determines when Burst Mode® transitions occur. It also enables external compensation network connection for loop stability optimization across varying output capacitor types and values.
Can the LTC3412AIFE#PBF operate in 100% duty cycle mode?
Yes, the LTC3412AIFE#PBF supports 100% duty cycle operation, allowing regulation even when input voltage approaches the output voltage. In this mode, the P-channel MOSFET remains continuously on, and output voltage equals VIN minus the drop across the internal P-FET RDS(ON) and inductor DCR. This feature extends battery life in portable systems by maximizing usable cell voltage range before brownout.
LTC3412AIFE#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:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-TSSOP-EP
LTC3412AIFE#PBF FAQ
1.How can I place an order for LTC3412AIFE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3412AIFE#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 LTC3412AIFE#PBF reliable?
The price and inventory of LTC3412AIFE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3412AIFE#PBF is usually 5 days.
3.What payment methods are accepted for LTC3412AIFE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3412AIFE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3412AIFE#PBF?
LTC3412AIFE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3412AIFE#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 LTC3412AIFE#PBF?
For technical support, including LTC3412AIFE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3412AIFE#PBF requirements.
6.How does Aetrix verify that LTC3412AIFE#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3412AIFE#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 LTC3412AIFE#PBF meets industry standards.
7.What is the process for return or replacement of LTC3412AIFE#PBF?
All LTC3412AIFE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3412AIFE#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 LTC3412AIFE#PBF part is unused and in its original packaging.
Return procedure for LTC3412AIFE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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