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Analog Devices Inc. LTC3412AMPFE#TRPBF
- Part No.:
- LTC3412AMPFE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LTC3412AMPFE#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 3A 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,673
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Product details
Overview
LTC3412AMPFE#TRPBF from Analog Devices is a high-efficiency monolithic synchronous step-down DC/DC regulator delivering up to 3A output current, operating from 2.25V to 5.5V input, with ±2% output voltage accuracy and programmable switching frequency from 300kHz to 4MHz. It features low RDS(ON) internal switches (77mΩ P-FET, 65mΩ N-FET), 64µA quiescent current in Burst Mode, and supports point-of-load regulation in portable instruments and notebook computers.
For engineers reviewing the LTC3412AMPFE#TRPBF datasheet, LTC3412AMPFE#TRPBF pinout, LTC3412AMPFE#TRPBF application, or LTC3412AMPFE#TRPBF equivalent, key selection considerations include its –55°C to 125°C extended temperature grade, exposed-pad 16-lead TSSOP package, OPTI-LOOP® compensation for transient optimization, selectable forced continuous/Burst Mode® operation, and power-good monitoring with ±7.5% threshold tolerance.
Technical Context
The LTC3412AMPFE#TRPBF employs a constant-frequency current-mode control architecture with integrated P-channel and N-channel MOSFETs. Its peak-current limit is 4.5A to 6A, and it implements slope compensation recovery to maintain consistent maximum inductor current across duty cycles up to 100%.
It supports three operational modes via the SYNC/MODE pin: forced continuous (for low-noise applications), Burst Mode® (for ultra-low IQ at light loads), and external clock synchronization (300kHz–4MHz). The ITH pin serves as both error amplifier output and burst comparator input, enabling adaptive sleep/wake control with adjustable burst clamp voltage.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.25V to 5.5V - enables direct regulation from single-cell Li-ion or 3.3V/5V rails without pre-regulation. |
| Output Current | Up to 3A - sufficient for FPGA core, SoC I/O, or DSP supply rails in space-constrained portable systems. |
| Switching Frequency | 300kHz to 4MHz - allows trade-off between small magnetics (high-freq) and high efficiency (low-freq). |
| Feedback Reference | 0.800V ±0.016V - supports precise low-voltage outputs (e.g., 0.8V, 1.0V, 1.2V) using standard resistor dividers. |
| Quiescent Current | 64µA in Burst Mode - extends battery runtime in always-on subsystems like real-time clocks or sensor interfaces. |
| Thermal Grade | –55°C to 125°C junction - qualified for military, aerospace, and industrial embedded applications requiring extended reliability. |
| Power Good Accuracy | ±7.5% output voltage window - provides robust system-level power sequencing and fault detection. |
Pinout & Package
Package: 16-lead plastic TSSOP with exposed pad (Pin 17 = SGND), rated θJA = 38°C/W, θJC = 10°C/W. Exposed pad must be soldered to PCB for thermal and electrical performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SVIN (Pin 1, Pin 11) | Signal Input Supply | Provides bias for internal analog circuitry; requires local decoupling to SGND to minimize noise coupling into feedback path. |
| PGOOD (Pin 2, Pin 12) | Open-Drain Power-Good Monitor | Asserts low when VOUT deviates >±7.5% from setpoint; used for system enable/disable sequencing and fault flagging. |
| ITH (Pin 3, Pin 13) | Error Amplifier Output / Burst Comparator Input | Controls peak inductor current; voltage range 0.2V–1.4V maps directly to current limit; also triggers Burst Mode sleep/wake transitions. |
| VFB (Pin 4, Pin 14) | Feedback Input | Compares resistive divider output against 0.8V reference; sets regulated output voltage per VOUT = 0.8V × (1 + R2/R1). |
| RT (Pin 5, Pin 15) | Oscillator Timing Resistor Input | Resistor to ground sets switching frequency: fOSC ≈ 308 GHz / ROSC; enables precise frequency tuning or EMI spread-spectrum design. |
| SYNC/MODE (Pin 6, Pin 16) | Mode Select / Clock Sync Input | Tied to SVIN → forced continuous; 0V–1V → adjustable Burst Mode; external clock (300kHz–4MHz) → synchronization with system timing source. |
| RUN/SS (Pin 7, Pin 1) | Enable / Soft-Start Control | <0.5V disables IC (<1µA shutdown current); capacitor to ground sets soft-start ramp time to prevent inrush current and overshoot. |
| SGND (Pin 8, Pin 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 high-dI/dt paths. |
| PVIN (Pins 9,16; Pins 3,10) | Power Input Supply | High-current VIN connection for internal FETs; requires low-ESR bulk and ceramic capacitors placed close to PVIN and PGND. |
| SW (Pins 10,11,14,15; Pins 4,5,8,9) | Switch Node | Connects to inductor; carries high dI/dt square wave; layout must minimize loop area to reduce EMI and voltage spikes. |
| PGND (Pins 12,13; Pins 6,7) | Power Ground Return | Return path for high-current switch and output capacitor; must be solid copper plane connected near COUT negative terminal. |
| Exposed Pad (Pin 17) | Signal Ground Thermal Path | Electrically tied to SGND; mandatory solder connection to PCB inner ground plane for thermal dissipation and noise immunity. |
Key Features
| Feature | Design Value |
|---|---|
| OPTI-LOOP® Compensation | Adaptive compensation network that maintains stable loop response across wide output capacitance (10µF–1000µF) and load (0.1A–3A) ranges. |
| 100% Duty Cycle Operation | Enables dropout regulation down to VIN – VOUT ≈ ILOAD × RDS(ON)_P, extending usable battery life in deep-discharge conditions. |
| Selectably Adjustable Burst Clamp | External voltage on SYNC/MODE pin sets minimum peak inductor current during Burst Mode, allowing ripple vs. efficiency trade-off tuning. |
| Internal Synchronous FETs | Eliminates need for external Schottky diode; reduces conduction losses and board area while improving efficiency by 3–5% over asynchronous designs. |
| Short-Circuit Protection | Secondary valley-current limit (4.4A) prevents runaway during output short; forces cycle skipping until inductor current decays below threshold. |
Applications
| Portable Instrument Power | Notebook CPU Core Supply |
|---|---|
|
Use Scenario: Battery-powered handheld test equipment requiring stable 1.2V/2A rail for microcontroller and ADC subsystems. IC Role / Device Role / Timing Role: Primary point-of-load regulator converting 3.3V system rail to precision low-noise 1.2V core voltage. Use Value: 64µA quiescent current in Burst Mode extends battery life during standby; ±2% accuracy ensures ADC reference stability. |
Use Scenario: High-performance ultrabook with dynamic CPU voltage scaling between 0.8V and 1.4V under varying workloads. IC Role / Device Role / Timing Role: Adaptive core voltage regulator synchronized to system clock to minimize EMI in RF-sensitive environments. Use Value: 4MHz programmable frequency enables compact 0.47µH inductor; OPTI-LOOP® ensures fast transient response to CPU load steps. |
| Distributed Power System | Industrial Sensor Node |
|
Use Scenario: Rack-mounted server blade with multiple isolated 2.5V/3A rails for FPGA, memory, and interface ICs. IC Role / Device Role / Timing Role: Local DC/DC converter providing clean, sequenced power with PGOOD signaling for system health monitoring. Use Value: –55°C to 125°C MP-grade qualification ensures reliability in uncontrolled thermal environments; exposed-pad TSSOP aids thermal management. |
Use Scenario: Remote wireless sensor node powered by primary lithium thionyl chloride cell (3.6V nominal, 2.0V cutoff). IC Role / Device Role / Timing Role: Ultra-low-IQ step-down regulator maintaining 3.3V rail during intermittent 10ms transmit bursts. Use Value: 2.25V minimum input enables full battery utilization; 100% duty cycle operation sustains regulation down to 2.0V input. |
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 |
|---|---|---|---|
| TPS543320RTWR | 4A output, 4.5V–18V input, 3mm × 3mm QFN, no Burst Mode, fixed 500kHz/1MHz options | Better suited for higher-input industrial rails; lacks ultra-low-IQ mode for battery longevity | Choose for 12V intermediate bus conversion where input >5.5V; avoid for sub-3V battery systems. |
| MP2332HGRT-Z | 3A output, 4.5V–21V input, 2.5V reference, 35µA IQ, no PGOOD or sync capability | Cost-optimized for consumer electronics; missing system-level features like power sequencing and EMI control | Choose for cost-sensitive 5V/12V-powered devices without strict sequencing or thermal requirements. |
Compared with TPS543320RTWR and MP2332HGRT-Z, the LTC3412AMPFE#TRPBF uniquely combines extended temperature range (–55°C), ultra-low 64µA Burst Mode IQ, programmable 300kHz–4MHz frequency, and integrated PGOOD-making it optimal for high-reliability, battery-constrained, and thermally demanding applications where feature completeness outweighs raw cost savings.
Availability
LTC3412AMPFE#TRPBF is available at Aetrix Electronics and suitable for point-of-load regulation, notebook computers, and portable instruments requiring stable component supply with extended temperature support and long-term obsolescence management.
Supply support for LTC3412AMPFE#TRPBF 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, serving industrial, automotive, communications, and healthcare markets.
The LTC3412AMPFE#TRPBF belongs to Analog Devices' Power by Linear™ family of high-efficiency DC/DC converters, designed specifically for demanding point-of-load applications where precision, thermal resilience, and low-noise operation are critical.
FAQ
What is the operating temperature range of the LTC3412AMPFE#TRPBF?
The LTC3412AMPFE#TRPBF is an MP-grade device qualified for operation from –55°C to 125°C junction temperature. This extended range exceeds standard commercial (0°C–70°C) and industrial (–40°C–125°C) grades, making it suitable for aerospace, defense, and harsh-environment industrial deployments where thermal stress is extreme. The part undergoes full electrical testing across this range, not just characterization or correlation.
How does the LTC3412AMPFE#TRPBF achieve 64µA quiescent current?
The LTC3412AMPFE#TRPBF achieves 64µA quiescent current in Burst Mode® by dynamically disabling most internal circuitry-including the oscillator, gate drivers, and error amplifier-during light-load sleep intervals. The ITH pin voltage drops below 150mV to trigger sleep mode, and the device wakes only when output voltage droop re-engages the error amplifier. This behavior is confirmed in the datasheet's Figure G20 and Electrical Characteristics table (IQ = 64µA, "Sleep" condition).
Can the LTC3412AMPFE#TRPBF synchronize to an external clock, and what is the valid frequency range?
Yes, the LTC3412AMPFE#TRPBF can synchronize its switching frequency to an external clock applied to the SYNC/MODE pin. The valid synchronization range is 300kHz to 4MHz, matching its internal programmable frequency range. During sync, the internal oscillator is disabled and each switching cycle begins at the falling edge of the external clock signal, as specified in the Applications Information section (Rev. G, p.9).
What is the purpose of the exposed pad on the LTC3412AMPFE#TRPBF package?
The exposed pad (Pin 17) on the LTC3412AMPFE#TRPBF is electrically connected to SGND and serves two critical functions: (1) it provides the primary thermal conduction path from the die to the PCB, with θJC = 10°C/W; and (2) it establishes a low-inductance, low-resistance signal ground reference for internal analog circuitry. Per the Absolute Maximum Ratings and Pin Configuration diagrams, it must be soldered to a PCB ground plane to meet thermal and functional specifications.
Does the LTC3412AMPFE#TRPBF support 100% duty cycle operation, and how is it implemented?
Yes, the LTC3412AMPFE#TRPBF supports true 100% duty cycle operation, enabling dropout regulation when input voltage approaches output voltage. This is implemented by holding the internal P-channel MOSFET continuously on-bypassing the current-mode control loop-so output voltage equals VIN minus the IR drop across the P-FET's RDS(ON) (77mΩ typical) and inductor DCR. This behavior is explicitly documented in the "Dropout Operation" subsection (Rev. G, p.9).
LTC3412AMPFE#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Packaging:
- Tape & Reel (TR)
- 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#TRPBF FAQ
1.How can I place an order for LTC3412AMPFE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3412AMPFE#TRPBF 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#TRPBF reliable?
The price and inventory of LTC3412AMPFE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3412AMPFE#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3412AMPFE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3412AMPFE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3412AMPFE#TRPBF?
LTC3412AMPFE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3412AMPFE#TRPBF 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#TRPBF?
For technical support, including LTC3412AMPFE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3412AMPFE#TRPBF requirements.
6.How does Aetrix verify that LTC3412AMPFE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3412AMPFE#TRPBF 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#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3412AMPFE#TRPBF?
All LTC3412AMPFE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3412AMPFE#TRPBF, 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#TRPBF part is unused and in its original packaging.
Return procedure for LTC3412AMPFE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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