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Analog Devices Inc. LT8612EUDE#PBF
- Part No.:
- LT8612EUDE#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 28-WFQFN Exposed Pad
- Datasheet:
-
LT8612EUDE#PBF.pdf
- Description:
- IC REG BUCK ADJ 6A 28QFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,708
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Product details
Overview
LT8612EUDE#PBF 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 compact automotive-grade QFN, used in infotainment power supplies and ADAS camera modules.
For engineers reviewing the LT8612EUDE#PBF datasheet, LT8612EUDE#PBF pinout, LT8612EUDE#PBF application, or LT8612EUDE#PBF equivalent, key selection criteria include ultralow IQ at light load, 40ns minimum on-time for high VIN/VOUT ratios, ±9% PG accuracy, AEC-Q100 qualification, and BIAS-pin efficiency optimization for ≥3.3V outputs.
Technical Context
The LT8612EUDE#PBF implements constant-frequency peak-current-mode control with internal 0.97V reference and slope compensation. Its 28-lead QFN package integrates top/bottom NMOS switches (65mΩ/29mΩ), supports external RT resistor programming, and enables low-ripple Burst Mode operation via SYNC pin grounding.
It features integrated thermal shutdown, input UVLO with 1V EN/UV threshold and 40mV hysteresis, PG flag with ±9% FB tolerance, and soft-start/tracking via TR/SS pin with 2.1µA internal pull-up. The BIAS pin reduces quiescent current by sourcing INTVCC from VOUT when ≥3.3V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.4V to 42V - supports 12V/24V automotive batteries with transient tolerance up to 42V absolute max. |
| Output Current | 6A continuous - delivers full rated current with 250mV dropout at 3A, enabling high-power rail generation in space-constrained layouts. |
| Quiescent Current | 3µA in Burst Mode - sustains >10-year battery life in always-on vehicle modules without compromising regulation stability. |
| Switching Frequency | 200kHz to 2.2MHz - programmable via RT resistor; enables small 3.9µH inductors and avoids AM band interference. |
| Minimum On-Time | 40ns - allows 5V output from 42V input at 700kHz (Duty ≈ 12%), critical for high-ratio automotive buck applications. |
| Feedback Reference | 0.970V ±0.006V - tight tolerance ensures ±1% output accuracy across temperature and line/load conditions. |
| Power Good Accuracy | ±9% of VFB - provides reliable startup sequencing and fault detection for downstream processors and sensors. |
Pinout & Package
LT8612EUDE#PBF uses a thermally enhanced 28-lead 3mm × 6mm plastic QFN (UDE package) with exposed pad soldered to PCB ground for θJC(PAD) = 5°C/W. Pin 29 is GND and must be connected to PCB thermal plane.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SYNC (1) | External clock sync input | Ground for Burst Mode (3µA IQ); tie to INTVCC or logic high for pulse-skipping; disables frequency foldback when asserted. |
| TR/SS (2) | Soft-start and tracking control | 2.1µA internal pull-up enables capacitor-programmed slew rate; pulled low during fault/shutdown via 230Ω MOSFET. |
| RT (3) | Frequency setting resistor node | Resistor to GND sets fSW from 200kHz–2.2MHz per RT = 46.5/fSW – 5.2 (kΩ, fSW in MHz). |
| EN/UV (4) | Enable and input UVLO control | 1.00V rising / 0.96V falling threshold; resistor divider from VIN programs custom undervoltage lockout point. |
| VIN (5–7) | Main input power supply | Three parallel pins minimize IR drop and inductance; require local 1µF ceramic bypass near pins. |
| PGND (8–10) | Power switch return path | Low-inductance ground return for bottom FET; must connect directly to input cap negative terminal. |
| SW (15–19) | Switch node | Five parallel pins reduce switching losses; connect to inductor and 0.1µF BST capacitor anode. |
| BST (20) | Bootstrap drive voltage | Supplies gate drive above VIN for top FET; requires 0.1µF ceramic capacitor between BST and SW. |
| INTVCC (21) | Internal 3.4V regulator output | Bypass with ≥1µF ceramic to PGND; supplies internal logic; draws from BIAS if VBIAS > 3.1V. |
| BIAS (22) | Efficiency-optimized bias supply | Connect to VOUT for ≥3.3V outputs to reduce IQ; decouple with 1µF if sourced externally. |
| PG (23) | Power good open-drain flag | Active-low signal valid when VIN > 3.4V; asserts low if VFB deviates >±9% or fault occurs. |
| FB (24) | Feedback voltage sense | Regulated to 0.970V; connect resistor divider tap here; add 4.7–10pF phase-lead cap from FB to VOUT. |
| NC (25–28) | No-connect | Internally unused; recommended to connect to PCB ground for mechanical stability and EMI reduction. |
Key Features
| Feature | Design Value |
|---|---|
| Ultralow IQ Burst Mode | 3µA input current at no load preserves battery runtime in always-on automotive systems without sacrificing regulation ripple (<10mVP-P). |
| High-Voltage Input Capability | 42V absolute max rating and 3.4V–42V operating range support 24V truck systems and cold-crank transients down to 3.4V. |
| Thermally Enhanced Package | 3mm × 6mm QFN with exposed pad achieves θJA = 40°C/W, enabling 6A operation without heatsink in 70°C ambient. |
| AEC-Q100 Qualified | Rated for –40°C to +125°C junction temperature with automotive reliability testing - qualified for safety-critical ADAS and infotainment rails. |
| Programmable Soft-Start & Tracking | TR/SS pin enables controlled ramp-up and seamless power sequencing with other regulators via external voltage source or capacitor. |
Applications
| Automotive Infotainment Power Supply | ADAS Camera Module Rail |
|---|---|
Use Scenario: Powers SoC, display interface, and audio codec in head-unit with 12V battery input and strict 3µA sleep current requirement. IC Role / Device Role / Timing Role: Primary 5V/6A buck converter delivering stable main system rail with PG signaling for processor boot sequencing. Use Value: 3µA quiescent current extends vehicle battery life during extended parking; AEC-Q100 qualification ensures reliability over 15-year automotive lifecycle. | Use Scenario: Supplies image sensor and ISP in rear-view camera with 24V input, EMI-sensitive analog video path, and thermal constraints. IC Role / Device Role / Timing Role: High-efficiency 3.3V/3A step-down regulator with low-noise Burst Mode operation and fast transient response to handle sensor burst modes. Use Value: 40ns min on-time enables direct 24V-to-3.3V conversion without pre-regulator; <10mVP-P ripple prevents video noise artifacts. |
| GSM Base Station Backup Supply | Industrial PLC I/O Module |
Use Scenario: Provides 5V/4A backup rail from 48V telecom battery during AC failure, requiring wide VIN and low standby loss. IC Role / Device Role / Timing Role: High-input-voltage synchronous buck maintaining regulation during brownouts with programmable UVLO on EN/UV pin. Use Value: 42V max rating and 3.4V min VIN allow operation across full 36–58V telecom range; 94% efficiency at 3A minimizes heat in sealed enclosures. | Use Scenario: Generates isolated 5V logic rail for digital I/O expansion in factory automation controller with 24V DC input and EMC requirements. IC Role / Device Role / Timing Role: Compact, low-EMI buck converter synchronized to system clock via SYNC pin to avoid spectral interference with CAN and EtherCAT buses. Use Value: 200kHz–2.2MHz synchronization range eliminates beat frequencies; QFN package reduces board area vs through-hole alternatives. |
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 2.2MHz max fSW, 2.5µA IQ, and integrated spread-spectrum modulation. | Better EMI performance in noise-sensitive RF environments; lacks AEC-Q100 qualification. | Select for industrial/commercial designs prioritizing EMI compliance over automotive qualification. |
| MPQ4420AGL-A-Z | 36V max input, 2A output, 17µA IQ, SOT-563 package; no BIAS pin or SYNC function. | Lower cost and smaller footprint for non-automotive 12V systems where 6A and ultralow IQ are not required. | Select for cost-sensitive consumer or industrial applications with ≤36V input and ≤2A load. |
Compared with LT8640SIV#PBF, the LT8612EUDE#PBF offers AEC-Q100 qualification and higher 6A output but lacks spread-spectrum EMI reduction; compared with MPQ4420AGL-A-Z, it delivers triple the current and 1/5 the quiescent current but requires larger QFN layout and higher BOM cost.
Availability
LT8612EUDE#PBF is available at Aetrix Electronics and suitable for automotive infotainment, ADAS camera modules, and industrial PLC I/O requiring stable component supply with long-term lifecycle assurance.
Supply support for LT8612EUDE#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 automotive, industrial, communications, and healthcare markets.
The LT8612EUDE#PBF belongs to the LT® monolithic synchronous buck regulator product line, designed specifically for high-input-voltage, ultralow-quiescent-current power conversion in automotive and harsh-environment applications.
FAQ
What is the maximum input voltage rating for the LT8612EUDE#PBF?
The LT8612EUDE#PBF has an absolute maximum input voltage rating of 42V, with guaranteed operation from 3.4V to 42V. This enables direct connection to 24V truck batteries and withstands load-dump transients common in automotive systems. Exceeding 42V may cause permanent damage, and operation below 3.4V will disable regulation. The LT8612EUDE#PBF maintains stable 5V output across this full range when properly configured with appropriate inductor and output capacitance.
How does the BIAS pin improve efficiency in the LT8612EUDE#PBF?
The BIAS pin on the LT8612EUDE#PBF reduces quiescent current by sourcing the internal 3.4V regulator (INTVCC) from VOUT instead of VIN when VBIAS ≥ 3.1V. For 3.3V or 5V outputs, connecting BIAS to VOUT cuts input supply current by ~1mA under full load, improving full-load efficiency by up to 1.2%. This feature is critical for thermal management in enclosed automotive modules. The LT8612EUDE#PBF datasheet specifies 14mA BIAS pin current consumption at 2MHz switching with 2A load.
Can the LT8612EUDE#PBF synchronize to an external clock, and how is it configured?
Yes, the LT8612EUDE#PBF synchronizes to an external clock via the SYNC pin (Pin 1). To enable synchronization, apply a clean CMOS/TTL clock signal (0.7V–1.55V thresholds) within 200kHz–2.2MHz range. When synchronized, the LT8612EUDE#PBF operates in pulse-skipping mode with fixed alignment of SW transitions to the external clock edge, eliminating beat frequencies. Grounding SYNC enables low-ripple Burst Mode (3µA IQ), while tying SYNC to INTVCC or logic high forces pulse-skipping without external clock.
What is the purpose of the TR/SS pin on the LT8612EUDE#PBF, and how is it used?
The TR/SS (Track/Soft-Start) pin on the LT8612EUDE#PBF controls output voltage ramp rate during startup and enables output voltage tracking. A capacitor from TR/SS to GND programs soft-start time; applying an external voltage enables tracking of another regulator's output. During faults or shutdown, an internal 230Ω MOSFET pulls TR/SS to GND. The LT8612EUDE#PBF's 2.1µA internal pull-up current allows precise slew-rate control - e.g., 100nF yields ~47ms rise time for 5V output - ensuring safe sequencing of downstream FPGAs and processors.
Is the LT8612EUDE#PBF qualified for automotive applications, and what does that entail?
Yes, the LT8612EUDE#PBF is AEC-Q100 qualified (Grade 1: –40°C to +125°C junction temperature) and manufactured under automotive quality systems. This qualification includes stress testing for temperature cycling, humidity, mechanical shock, and lifetime reliability - ensuring robustness in engine bay and dashboard environments. The LT8612EUDE#PBF part marking "#W" suffix denotes automotive grade; the standard #PBF version meets the same specs but lacks formal automotive documentation packages. Both share identical electrical performance and thermal characteristics.
LT8612EUDE#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 28-WFQFN 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):
- 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#PBF FAQ
1.How can I place an order for LT8612EUDE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8612EUDE#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 LT8612EUDE#PBF reliable?
The price and inventory of LT8612EUDE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8612EUDE#PBF is usually 5 days.
3.What payment methods are accepted for LT8612EUDE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8612EUDE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8612EUDE#PBF?
LT8612EUDE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8612EUDE#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 LT8612EUDE#PBF?
For technical support, including LT8612EUDE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8612EUDE#PBF requirements.
6.How does Aetrix verify that LT8612EUDE#PBF is sourced from the original manufacturer or authorized distributors?
All LT8612EUDE#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 LT8612EUDE#PBF meets industry standards.
7.What is the process for return or replacement of LT8612EUDE#PBF?
All LT8612EUDE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8612EUDE#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 LT8612EUDE#PBF part is unused and in its original packaging.
Return procedure for LT8612EUDE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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