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Analog Devices Inc. LT8612IUDE#PBF
- Part No.:
- LT8612IUDE#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 28-WFQFN Exposed Pad
- Datasheet:
-
LT8612IUDE#PBF.pdf
- Description:
- IC REG BUCK ADJ 6A 28QFN
- Quantity:
- Payment:
- Shipping:
Inventory:7,075
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Product details
Overview
LT8612IUDE#PBF from Analog Devices is a 42V, 6A synchronous step-down regulator with 3µA quiescent current in Burst Mode, 40ns minimum on-time, and ±9% power-good accuracy. It integrates top/bottom NMOS switches, internal compensation, and supports adjustable switching frequency from 200kHz to 2.2MHz. Designed for automotive and industrial power supplies requiring ultra-low IQ and high efficiency at light loads.
For engineers reviewing the LT8612IUDE#PBF datasheet, LT8612IUDE#PBF pinout, LT8612IUDE#PBF application, or LT8612IUDE#PBF equivalent, key selection considerations include its AEC-Q100 qualification, 3.4V–42V input range, 0.97V feedback reference, thermal performance in the 3mm × 6mm QFN package, and compatibility with low-ESR ceramic output capacitors.
Technical Context
The LT8612IUDE#PBF implements peak-current-mode control with internal compensation, enabling fast transient response and stable operation with small inductors. Its architecture includes integrated 65mΩ top and 29mΩ bottom NMOS switches, programmable frequency via RT resistor, and dual-mode operation (Burst Mode for <3µA IQ, pulse-skipping when SYNC is high).
It features accurate 1V EN/UV threshold with 40mV hysteresis, soft-start/tracking via TR/SS pin with 2.1µA internal pull-up, and PG flag asserting when FB deviates >±9% from 0.97V. The device tolerates inductor saturation during overload and supports BIAS pin biasing for improved efficiency at ≥3.3V outputs.
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 in UDE package. |
| Quiescent Current | 3µA in Burst Mode - enables >10-year battery life in always-on automotive modules and IoT edge sensors. |
| Feedback Reference | 0.970V ±0.006V - enables precise output regulation with minimal error across temperature and line/load variations. |
| Switching Frequency | 200kHz to 2.2MHz - adjustable via RT resistor; higher frequencies allow smaller magnetics and reduced solution footprint. |
| Min On-Time / Off-Time | 40ns / 50ns - supports high VIN-to-VOUT step-down ratios (e.g., 24V→3.3V) without pulse skipping at light loads. |
| Power-Good Accuracy | ±9% window around VREF - provides reliable system sequencing and fault detection without external comparators. |
Pinout & Package
LT8612IUDE#PBF is housed in a thermally enhanced 28-lead 3mm × 6mm plastic QFN package (UDE) with exposed GND pad (Pin 29), θJA = 40°C/W, θJC(PAD) = 5°C/W. The package requires soldering of the exposed pad to PCB for optimal thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SYNC (1) | External clock synchronization input | Enables frequency alignment to external source; tied low for Burst Mode, high for pulse-skipping; avoids EMI peaks. |
| TR/SS (2) | Soft-start and output tracking control | 2.1µA internal pull-up allows capacitor-programmed slew rate; pulled low during fault/shutdown for safe ramp-down. |
| RT (3) | Switching frequency programming | Resistor-to-ground sets fSW from 200kHz–2.2MHz; enables optimization of efficiency vs. size trade-offs. |
| EN/UV (4) | Enable and input undervoltage lockout | 1.00V rising threshold with 40mV hysteresis; supports programmable VIN UVLO using external divider. |
| VIN (5–7) | Main input power supply | Three parallel pins reduce IR drop and improve current handling; must be locally bypassed with low-ESR ceramic. |
| PGND (8–10) | Power switch ground return | Low-inductance path for bottom FET; ties directly to input capacitor negative terminal for clean switching node. |
| SW (15–19) | Switch node connection | Five parallel pins minimize trace inductance; connects to inductor and BST capacitor; critical for EMI reduction. |
| BST (20) | Bootstrap supply for top FET gate drive | Requires 0.1µF ceramic capacitor between BST and SW; ensures sufficient gate voltage for low RDS(ON). |
| INTVCC (21) | Internal 3.4V regulator bypass | Must be decoupled with ≥1µF ceramic to PGND; powers internal logic; draws from BIAS if VBIAS > 3.1V. |
| BIAS (22) | Efficiency-optimized bias supply | Connect to VOUT ≥3.3V to reduce VIN current draw and improve light-load efficiency by ~15%. |
| PG (23) | Open-drain power-good flag | Asserts low when VOUT is outside ±9% of target or fault occurs; valid above 3.4V VIN regardless of EN state. |
| FB (24) | Feedback voltage sensing | Regulated to 0.970V; connects to resistor divider tap; phase-lead capacitor (4.7–10pF) improves loop stability. |
| NC (25–28) | No-connect terminals | Internally unconnected; recommended to tie to GND for mechanical stability and EMI shielding. |
Key Features
| Feature | Design Value |
|---|---|
| Ultralow IQ Burst Mode | 3µA input current at no load - extends battery runtime in always-on automotive telematics and ADAS modules. |
| AEC-Q100 Grade I | Qualified for –40°C to +125°C junction operation - meets automotive reliability requirements without derating. |
| Integrated Power Switches | 65mΩ top / 29mΩ bottom NMOS - eliminates external MOSFETs and gate drivers, reducing BOM count and layout complexity. |
| Fast Minimum On-Time | 40ns - enables high step-down ratios (e.g., 42V→3.3V @ 700kHz) while maintaining PWM control down to light loads. |
| Robust Overload Handling | Safely operates with saturated inductors - prevents thermal runaway during short-circuit or startup into heavy loads. |
| Programmable Soft-Start | Capacitor-controlled TR/SS ramp - prevents inrush current and enables controlled power sequencing in multi-rail systems. |
Applications
| Automotive Infotainment Power | Industrial PLC I/O Module Supply |
|---|---|
|
Use Scenario: Powering 5V/3.3V rails for display controllers, audio codecs, and CAN transceivers in head units. IC Role / Device Role / Timing Role: Primary buck converter delivering regulated 5V at up to 6A with low-noise Burst Mode operation. Use Value: 3µA quiescent current enables compliance with automotive "parking mode" current budgets (<100µA total system). |
Use Scenario: Generating isolated 3.3V logic supply for digital I/O expansion cards in programmable logic controllers. IC Role / Device Role / Timing Role: High-reliability DC/DC stage converting 24V field bus to 3.3V microcontroller rail. Use Value: 42V max input withstands 36V transients per IEC 61000-4-5; AEC-Q100 qualification ensures long-term field stability. |
| GSM Base Station RF Power Amp Bias | Medical Portable Diagnostic Sensor Supply |
|
Use Scenario: Providing tightly regulated 5V bias for GaN power amplifiers in small-cell base stations with strict EMI limits. IC Role / Device Role / Timing Role: Synchronous buck regulator operating at 2.2MHz to avoid sensitive RF bands and minimize filter size. Use Value: 40ns min on-time supports 28V→5V conversion at 2.2MHz; low ripple <10mVP-P reduces RF noise coupling. |
Use Scenario: Powering low-power analog front-ends and ADCs in handheld ultrasound or glucose monitors with coin-cell batteries. IC Role / Device Role / Timing Role: Ultra-low-IQ step-down regulator generating 3.3V from 3.6V Li-ion with soft-start for sensor calibration sequence. Use Value: 3µA IQ extends single-charge battery life beyond 5 years; ±9% PG flag enables safe shutdown before brownout. |
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 |
|---|---|---|---|
| LT8614IUDE#PBF | Quad-channel version with independent enable/control; same 42V/6A per channel, but larger 4mm × 6mm package. | Used where multiple isolated rails (e.g., 5V, 3.3V, 1.8V, 1.2V) are needed on one board with shared thermal management. | Select LT8614IUDE#PBF only when multi-output integration justifies added cost and PCB area; not pin-compatible. |
| MPQ4420AGU-A-Z | 42V/2A monolithic buck; 17µA IQ in skip mode; no BIAS pin; 0.8V reference; smaller 3mm × 4mm QFN-12 package. | Suitable for lower-current applications (<2A) where ultra-low IQ is secondary to cost and footprint; lacks AEC-Q100 rating. | Choose MPQ4420AGU-A-Z for cost-sensitive industrial controls without automotive qualification requirements. |
Compared with LT8612IUDE#PBF, the LT8614IUDE#PBF offers multi-rail integration at the expense of pin count and layout flexibility, while the MPQ4420AGU-A-Z trades off current capability, IQ, and qualification for lower unit cost and smaller footprint in non-automotive designs.
Availability
LT8612IUDE#PBF is available at Aetrix Electronics and suitable for automotive infotainment systems, industrial PLC power modules, and portable medical diagnostics requiring stable component supply, long lifecycle support, and AEC-Q100-compliant performance.
Supply support for LT8612IUDE#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, serving industrial, automotive, communications, and healthcare markets.
The LT8612IUDE#PBF belongs to the LT® monolithic synchronous buck regulator product line, engineered for ultra-low quiescent current and high efficiency in harsh environments such as automotive and industrial power systems.
FAQ
What is the operating temperature range for the LT8612IUDE#PBF?
The LT8612IUDE#PBF is specified for operation from –40°C to +125°C junction temperature and is qualified to AEC-Q100 Grade I standards. This makes it suitable for under-hood automotive applications and industrial environments where ambient temperatures exceed 85°C. Derating curves in the datasheet confirm full performance across this range without external thermal management beyond standard PCB copper pour.
How does the LT8612IUDE#PBF achieve 3µA quiescent current?
The LT8612IUDE#PBF achieves 3µA quiescent current through ultralow-power Burst Mode operation, where internal circuitry-including gate drivers and error amplifier-is periodically powered down between energy bursts. During sleep periods, only essential bias circuits remain active, drawing just 1.7µA. The 3µA figure includes typical feedback divider current; minimizing that current (e.g., using 1MΩ resistors) ensures the spec is met in real applications.
Can the LT8612IUDE#PBF be synchronized to an external clock?
Yes, the LT8612IUDE#PBF supports external clock synchronization via the SYNC pin (Pin 1). When driven with a TTL- or CMOS-compatible square wave between 200kHz and 2.2MHz, the device aligns its switching edges to the external clock, eliminating beat frequencies and simplifying EMI filtering. If SYNC is held high (≥3V), the part enters pulse-skipping mode instead of Burst Mode, increasing IQ to several hundred µA.
What is the purpose of the BIAS pin on the LT8612IUDE#PBF?
The BIAS pin on the LT8612IUDE#PBF allows the internal 3.4V regulator to draw current from the output rail (VOUT) instead of VIN when VBIAS ≥ 3.1V. This reduces input supply current and improves light-load efficiency-especially beneficial for 3.3V or 5V outputs. For example, connecting BIAS to VOUT cuts VIN current by ~15% at 10mA load, directly extending battery life in always-on systems.
Is the LT8612IUDE#PBF pin-compatible with other members of the LT861x family?
No, the LT8612IUDE#PBF is not pin-compatible with other LT861x variants such as LT8613 or LT8614. While all share the UDE 28-pin QFN package, pin functions differ significantly-for example, LT8614 dedicates pins to additional EN/PG signals and has different SW/BST routing. Layout reuse is not possible; each variant requires its own PCB design based on its specific pinout and thermal pad configuration.
LT8612IUDE#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)
LT8612IUDE#PBF FAQ
1.How can I place an order for LT8612IUDE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8612IUDE#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 LT8612IUDE#PBF reliable?
The price and inventory of LT8612IUDE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8612IUDE#PBF is usually 5 days.
3.What payment methods are accepted for LT8612IUDE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8612IUDE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8612IUDE#PBF?
LT8612IUDE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8612IUDE#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 LT8612IUDE#PBF?
For technical support, including LT8612IUDE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8612IUDE#PBF requirements.
6.How does Aetrix verify that LT8612IUDE#PBF is sourced from the original manufacturer or authorized distributors?
All LT8612IUDE#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 LT8612IUDE#PBF meets industry standards.
7.What is the process for return or replacement of LT8612IUDE#PBF?
All LT8612IUDE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8612IUDE#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 LT8612IUDE#PBF part is unused and in its original packaging.
Return procedure for LT8612IUDE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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