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Analog Devices Inc. LT8612EUDE#TRPBF
- Part No.:
- LT8612EUDE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 28-WFQFN Exposed Pad
- Datasheet:
-
LT8612EUDE#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 6A 28QFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,951
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Product details
Overview
LT8612EUDE#TRPBF from Analog Devices is a 42V, 6A synchronous step-down regulator with 3µA quiescent current in Burst Mode, peak-current-mode control, internal compensation, and 200kHz–2.2MHz programmable switching frequency. It delivers regulated 5V/6A output from 5.6V–42V input in automotive and industrial power supplies.
For engineers reviewing the LT8612EUDE#TRPBF datasheet, LT8612EUDE#TRPBF pinout, LT8612EUDE#TRPBF application, or LT8612EUDE#TRPBF equivalent, key selection factors include ultralow IQ at light load, 40ns minimum on-time for high VIN/VOUT ratios, ±9% power-good accuracy, AEC-Q100 qualification, and thermal performance in the 3mm × 6mm 28-lead QFN package with exposed pad.
Technical Context
The LT8612EUDE#TRPBF implements constant-frequency peak-current-mode control with internal slope compensation and a 0.970V feedback reference. Its oscillator supports external synchronization (SYNC pin) or RT-resistor programming across 200kHz–2.2MHz, enabling optimization for EMI, size, or efficiency.
Burst Mode operation reduces quiescent current to 3µA while maintaining <10mVP-P output ripple; pulse-skipping mode (via SYNC high) enables faster transient response at higher IQ. The device integrates top/bottom NMOS switches (65mΩ/29mΩ), supports BIAS pin sourcing for improved efficiency at ≥3.3V outputs, and features frequency foldback during start-up or overcurrent.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.4V to 42V - supports wide-range industrial and automotive battery inputs including cold-crank and load-dump conditions. |
| Output Current | 6A continuous - delivers full rated current with thermal management via exposed-pad QFN package (θJC = 5°C/W). |
| Quiescent Current | 3µA in Burst Mode - enables >10-year battery life in always-on automotive modules and IoT edge sensors. |
| Switching Frequency | 200kHz to 2.2MHz - programmable via RT resistor; allows trade-off between inductor size, efficiency, and EMI compliance. |
| Min On-Time | 40ns - enables high step-down ratios (e.g., 42V→3.3V) without pulse skipping or duty-cycle limitation. |
| Feedback Reference | 0.970V ±0.006V - tight tolerance enables accurate output regulation with standard 1% resistors in FB divider. |
| Power-Good Accuracy | ±9% of VOUT - PG flag asserts when output deviates beyond this window, supporting reliable system sequencing and fault detection. |
Pinout & Package
LT8612EUDE#TRPBF is housed in a thermally enhanced 28-lead 3mm × 6mm plastic QFN package (UDE) with exposed pad (Pin 29) soldered to PCB ground for low thermal resistance (θJA = 40°C/W, θJC = 5°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SYNC (1) | External clock input | Enables synchronization to external clock or selects Burst Mode (low) vs pulse-skipping (high); critical for EMI reduction in multi-rail systems. |
| TR/SS (2) | Soft-start & tracking control | 2.1µA internal pull-up enables capacitor-programmed voltage ramp rate; supports power sequencing and inrush limiting. |
| RT (3) | Frequency set resistor | Resistor-to-ground sets switching frequency from 200kHz to 2.2MHz; determines inductor/capacitor sizing and noise profile. |
| EN/UV (4) | Enable & undervoltage lockout | 1.00V rising threshold with 40mV hysteresis - allows precise input UVLO programming or shutdown control. |
| VIN (5–7) | Main input supply | Three parallel pins minimize IR drop and inductance; require local high-frequency bypassing near PGND for stable high-current operation. |
| PGND (8–10) | Power switch return | Low-impedance path for bottom-FET current; must be tied together and connected directly to input capacitor negative terminal. |
| SW (15–19) | Switch node | Five parallel pins reduce switching node impedance and EMI; connect directly to inductor and BST capacitor with minimal loop area. |
| BST (20) | Bootstrap supply | Drives top-FET gate above VIN; requires 0.1µF ceramic capacitor placed adjacent to IC for reliable high-side conduction. |
| INTVCC (21) | Internal 3.4V regulator output | Bypass with ≥1µF ceramic capacitor; powers internal logic; draws current from BIAS if VBIAS > 3.1V, else from VIN. |
| BIAS (22) | Efficiency-optimized bias supply | Connect to VOUT ≥3.3V to reduce VIN current draw and improve light-load efficiency; decoupling required if externally sourced. |
| PG (23) | Open-drain power-good | Pulls low when VOUT is outside ±9% of target or fault occurs; valid only when VIN > 3.4V regardless of EN/UV state. |
| FB (24) | Feedback reference input | Regulated to 0.970V; connects to resistor divider tap; requires 4.7–10pF phase-lead capacitor to VOUT for stability. |
| NC (25–28) | No-connect | Internally unconnected; must be tied to PCB ground for mechanical integrity and thermal conduction. |
Key Features
| Feature | Design Value |
|---|---|
| Ultralow IQ Burst Mode | 3µA input current at no load maintains >10-year battery life in always-on automotive telematics and sensor nodes. |
| 40ns Minimum On-Time | Enables direct 42V-to-3.3V conversion without intermediate stages, reducing BOM count and board space in high-voltage systems. |
| AEC-Q100 Qualified | Rated for –40°C to +125°C junction temperature with automotive-grade reliability testing - suitable for engine control, ADAS, and infotainment. |
| Internal Compensation | Eliminates external compensation network, simplifying design and improving consistency across production units and temperature ranges. |
| Synchronous Switching | Integrated 65mΩ/29mΩ NMOS FETs deliver up to 95% efficiency at 3A/5VOUT from 12VIN, reducing heat sink requirements. |
Applications
| Automotive Infotainment Power | Industrial PLC I/O Module |
|---|---|
Use Scenario: Powering 5V/3A display controller and audio codec in head unit under 9V–16V battery input with cold-crank down to 6V. IC Role / Device Role / Timing Role: Primary synchronous buck regulator providing stable 5V rail with fast transient response to bursty display backlight loads. Use Value: 40ns min-on-time ensures regulation during 6V cold-crank; 3µA IQ extends backup battery life during sleep mode. | Use Scenario: Generating 3.3V/2A logic supply for microcontroller and isolated CAN transceivers in DIN-rail mounted PLC with 24VDC input. IC Role / Device Role / Timing Role: High-efficiency, low-noise DC/DC converter delivering clean 3.3V for noise-sensitive digital circuitry. Use Value: 94% efficiency at 3A/3.3VOUT minimizes thermal stress in sealed enclosures; SYNC pin enables EMI spread-spectrum alignment. |
| GSM Base Station RF Power Amp Bias | Medical Portable Diagnostic Device |
Use Scenario: Providing 5V/4A bias supply to GaN RF power amplifier stage operating from 28V telecom supply with strict ripple limits. IC Role / Device Role / Timing Role: High-current, low-ripple step-down regulator with programmable frequency to avoid sensitive RF bands. Use Value: <10mVP-P ripple in Burst Mode meets GSM spectral mask requirements; 2.2MHz max fSW enables compact 2.2µH inductor. | Use Scenario: Powering 3.3V/1.5A FPGA and ADC subsystem in handheld ultrasound probe powered by Li-ion battery (3.0–4.2V). IC Role / Device Role / Timing Role: Wide-input buck converter supporting battery voltage range while maintaining regulated 3.3V output during transmit bursts. Use Value: 3.4V min input enables operation down to nearly depleted battery; BIAS pin connection to VOUT improves light-load efficiency by 12%. |
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 |
|---|---|---|---|
| LT8640SIV#PBF | Same 42V/6A rating, but 2.5µA IQ, integrated spread-spectrum, and higher 3.2MHz max fSW; uses 3mm × 4mm 20-lead LQFN. | Preferred for EMI-sensitive medical or test equipment where spread-spectrum is mandatory; smaller footprint but lower thermal mass. | Select LT8640SIV#PBF when EMI compliance is primary and board space is constrained; verify thermal derating at 6A in smaller package. |
| MPQ4433AGL-A-Z | 45V/6A, 17µA IQ, no SYNC or TR/SS pins, fixed 500kHz/1MHz options; 4mm × 5mm 28-pin QFN. | Suitable for cost-sensitive industrial power where ultralow IQ and soft-start are not required; lacks automotive qualification. | Choose MPQ4433AGL-A-Z for non-automotive applications prioritizing BOM cost over IQ, sequencing, or AEC-Q100 compliance. |
Compared with LT8640SIV#PBF and MPQ4433AGL-A-Z, the LT8612EUDE#TRPBF offers the lowest quiescent current (3µA) and full AEC-Q100 qualification, making it optimal for automotive always-on systems, while its 28-lead QFN provides superior thermal performance at full 6A load versus the LT8640SIV's smaller LQFN.
Availability
LT8612EUDE#TRPBF is available at Aetrix Electronics and suitable for automotive infotainment, industrial PLC power supplies, and portable medical diagnostics requiring stable component supply, long-lifecycle support, and AEC-Q100-compliant performance.
Supply support for LT8612EUDE#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 LT8612EUDE#TRPBF belongs to the LT® monolithic synchronous buck regulator product line, designed specifically for high-efficiency, ultralow-quiescent-current power conversion in harsh automotive and industrial environments.
FAQ
What is the maximum output current capability of the LT8612EUDE#TRPBF?
The LT8612EUDE#TRPBF is rated for 6A continuous output current under proper thermal conditions. Its 3mm × 6mm QFN package with exposed pad achieves θJC = 5°C/W, enabling full 6A operation with adequate PCB copper area and airflow. Peak switch current limit ranges from 7.5A to 12.0A depending on duty cycle, supporting short-term overload tolerance.
Does the LT8612EUDE#TRPBF support synchronization to an external clock?
Yes, the LT8612EUDE#TRPBF supports external clock synchronization via the SYNC pin (Pin 1). When driven with a logic-level clock signal between 200kHz and 2.2MHz, the device aligns its switching edges to the external source, enabling EMI reduction in multi-converter systems. DC high on SYNC enables pulse-skipping mode; floating or unconnected SYNC is not allowed.
How does the BIAS pin improve efficiency in the LT8612EUDE#TRPBF?
The BIAS pin on the LT8612EUDE#TRPBF allows the internal 3.4V regulator to draw current from VOUT (≥3.3V) instead of VIN, reducing input supply current and improving light-load efficiency by up to 12%. This is especially beneficial in 3.3V or 5V output applications where VOUT can directly power internal circuitry, lowering overall system power dissipation.
What is the purpose of the TR/SS pin on the LT8612EUDE#TRPBF?
The TR/SS (Track/Soft-Start) pin on the LT8612EUDE#TRPBF serves dual functions: it controls output voltage ramp rate during startup via an external capacitor (soft-start), and enables output voltage tracking in multi-rail systems by forcing regulation to match an external reference voltage below 0.97V. An internal 2.1µA pull-up current enables simple RC-based timing.
Is the LT8612EUDE#TRPBF qualified for automotive applications?
Yes, the LT8612EUDE#TRPBF is AEC-Q100 qualified for automotive applications, rated over the –40°C to +125°C junction temperature range. It meets stringent automotive reliability, qualification, and traceability requirements, making it suitable for engine control units, ADAS cameras, infotainment systems, and body electronics where long-term robustness is essential.
LT8612EUDE#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 28-WFQFN 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):
- 3.4V
- Voltage - Input (Max):
- 42V
- Voltage - Output (Min/Fixed):
- 0.97V
- Voltage - Output (Max):
- 41.6V
- Current - Output:
- 6A
- Frequency - Switching:
- 200kHz ~ 2.2MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-QFN (3x6)
LT8612EUDE#TRPBF FAQ
1.How can I place an order for LT8612EUDE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8612EUDE#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 LT8612EUDE#TRPBF reliable?
The price and inventory of LT8612EUDE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8612EUDE#TRPBF is usually 5 days.
3.What payment methods are accepted for LT8612EUDE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8612EUDE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8612EUDE#TRPBF?
LT8612EUDE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8612EUDE#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 LT8612EUDE#TRPBF?
For technical support, including LT8612EUDE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8612EUDE#TRPBF requirements.
6.How does Aetrix verify that LT8612EUDE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT8612EUDE#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 LT8612EUDE#TRPBF meets industry standards.
7.What is the process for return or replacement of LT8612EUDE#TRPBF?
All LT8612EUDE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8612EUDE#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 LT8612EUDE#TRPBF part is unused and in its original packaging.
Return procedure for LT8612EUDE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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