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Analog Devices Inc. LT8612IUDE#TRPBF
- Part No.:
- LT8612IUDE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 28-WFQFN Exposed Pad
- Datasheet:
-
LT8612IUDE#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 6A 28QFN
- Quantity:
- Payment:
- Shipping:
Inventory:5,979
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Product details
Overview
LT8612IUDE#TRPBF from Analog Devices is a 42V, 6A synchronous step-down regulator with 3µA quiescent current in Burst Mode, 40ns minimum on-time, and internal compensation for fast transient response. It delivers regulated 5V/6A output from 5.6–42V input and is AEC-Q100 qualified for automotive power supplies.
For engineers reviewing the LT8612IUDE#TRPBF datasheet, LT8612IUDE#TRPBF pinout, LT8612IUDE#TRPBF application, or LT8612IUDE#TRPBF equivalent, key selection criteria include ultralow IQ at light load, 95% efficiency at 3A/5VOUT from 12VIN, ±9% power-good accuracy, 200kHz–2.2MHz programmable switching frequency, and thermal robustness in the 3mm × 6mm QFN package.
Technical Context
The LT8612IUDE#TRPBF employs peak-current-mode control with internal compensation, enabling stable operation with small inductors and fast load-transient response. Its 40ns minimum on-time supports high VIN/VOUT ratios (e.g., 42V→3.3V), while frequency foldback protects during start-up and overload.
Burst Mode operation maintains <10mVP-P output ripple at light loads with only 3µA input quiescent current; pulse-skipping mode (via SYNC pin) enables synchronization to external clocks up to 2.2MHz and eliminates low-frequency beat tones in noise-sensitive systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.4V to 42V - supports wide automotive battery transients and industrial 24V/36V rails without pre-regulation. |
| Output Current | 6A continuous - sustains full rated load with ≤250mV dropout at 3A, enabling high-current point-of-load regulation. |
| Quiescent Current | 3µA in Burst Mode - extends battery life in always-on automotive modules (e.g., telematics, ADAS sensors). |
| Switching Frequency | 200kHz to 2.2MHz (RT-programmable) - allows optimization of size (high-freq) vs. efficiency (low-freq) and EMI compliance. |
| Feedback Reference | 0.970V ±0.006V - enables precise output voltage setting (e.g., 3.3V ±1%) with standard 1% resistors. |
| Power-Good Accuracy | ±9% window around VFB - provides reliable system sequencing and fault detection without external supervision. |
| Thermal Rating | –40°C to +125°C junction - qualified per AEC-Q100 Grade I, suitable for under-hood and engine-control applications. |
Pinout & Package
LT8612IUDE#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 θJC(PAD) = 5°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SYNC (1) | External clock input | Enables synchronization to external clock (200kHz–2.2MHz) or forces pulse-skipping mode; must not be left floating. |
| TR/SS (2) | Soft-start & tracking control | 2.1µA internal pull-up enables capacitor-programmed VOUT ramp rate; pulled low during fault/shutdown. |
| RT (3) | Frequency set resistor | Resistor to GND sets switching frequency (e.g., 60.4kΩ → 700kHz); tolerance directly impacts fSW accuracy. |
| EN/UV (4) | Enable & input UVLO | 1.00V rising threshold with 40mV hysteresis - allows programmable VIN undervoltage lockout via resistor divider. |
| VIN (5–7) | Main input power | Three parallel pins minimize trace resistance and inductance; require local 1µF ceramic bypass close to pins. |
| PGND (8–10) | Power switch return | Low-inductance path for bottom-FET current; must tie directly to input capacitor negative terminal. |
| SW (15–19) | Switch node | Five parallel pins reduce switching losses and EMI; connect to inductor and BST capacitor with minimal loop area. |
| BST (20) | Bootstrap supply | Requires 0.1µF ceramic capacitor between BST and SW to drive top FET gate above VIN. |
| INTVCC (21) | Internal 3.4V regulator output | Bypass with ≥1µF ceramic; supplies internal logic; draws current from BIAS if VBIAS > 3.1V, else from VIN. |
| BIAS (22) | Efficiency-boost bias supply | Connect to VOUT for ≥3.3V outputs to reduce VIN current and improve light-load efficiency. |
| PG (23) | Open-drain power-good flag | Asserts low when VFB deviates >±9% or fault occurs; valid above 3.4V VIN 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 cap 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 preserves battery runtime in always-on automotive ECUs and IoT edge nodes. |
| Fast Minimum On-Time | 40ns enables high step-down ratios (e.g., 42V→3.3V at 700kHz) without pulse skipping or instability. |
| Integrated Power Switches | Top (65mΩ) and bottom (29mΩ) NMOS switches eliminate external FETs and gate drivers, reducing BOM count and layout complexity. |
| Robust Overload Handling | Safely tolerates inductor saturation during overload-peak current limit decreases linearly from 9.7A (low duty) to 7.5A (80% duty). |
| AEC-Q100 Qualified | Grade I (–40°C to +125°C) qualification ensures reliability in automotive powertrain, body electronics, and infotainment systems. |
Applications
| Automotive Infotainment Power | Industrial PLC I/O Module |
|---|---|
|
Use Scenario: Powering 5V/3A display controller and USB hub in head-unit with cold-crank (4.5V) and load-dump (42V) immunity. IC Role / Device Role / Timing Role: Primary 5V buck regulator with programmable UVLO, PG signaling, and thermal shutdown. Use Value: 3µA quiescent current prevents battery drain during vehicle sleep; 40ns on-time maintains regulation down to 4.5V cold-crank. |
Use Scenario: Generating isolated 3.3V/2A supply for microcontroller and CAN transceiver in DIN-rail mounted PLC. IC Role / Device Role / Timing Role: High-efficiency, low-noise DC/DC converter with SYNC pin synchronized to system clock for EMI reduction. Use Value: 94% efficiency at 3A/3.3V reduces thermal stress in sealed enclosures; AEC-Q100 qualification validates long-term field reliability. |
| GSM Base Station RF Power Amp | Medical Patient Monitor |
|
Use Scenario: Providing 5V/4A bias to GaN RF power amplifier with strict ripple (<10mVP-P) and transient response requirements. IC Role / Device Role / Timing Role: High-current, low-ripple buck regulator operating in Burst Mode during standby and pulse-skipping during transmit bursts. Use Value: <10mVP-P ripple avoids AM interference in receive band; 200ns load-step response minimizes droop during PA enable. |
Use Scenario: Supplying 3.3V/1.5A to ARM Cortex-M7 MCU and analog front-end in portable diagnostic device with Li-ion battery backup. IC Role / Device Role / Timing Role: Ultra-low-power primary regulator with soft-start (TR/SS) for controlled power-up sequencing and BIAS pin optimization. Use Value: 3µA IQ extends battery life >72 hours in standby; TR/SS pin enables coordinated ramp-up with ADC reference and sensor bias rails. |
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#TRPBF | Quad-channel version with independent FB/EN/PG per channel; same 42V/6A per channel, 3µA IQ, and package. | Required for multi-rail systems (e.g., 1.2V/1.8V/3.3V/5V) where channel independence and sequencing matter. | Select LT8614IUDE#TRPBF only when multiple independent outputs are needed; LT8612IUDE#TRPBF is lower-cost for single-output designs. |
| MPQ4433AGL-AEC1-Z | 45V/6A monolithic buck; 17µA IQ (Burst Mode), 75ns min on-time, no BIAS pin, non-AEC-Q100 but AEC-Q200 qualified. | Suitable for cost-sensitive industrial applications where AEC-Q100 is not mandated and 3µA IQ is not critical. | Choose MPQ4433AGL-AEC1-Z for non-automotive industrial use with relaxed IQ and thermal specs; LT8612IUDE#TRPBF remains preferred for automotive-grade reliability and lowest IQ. |
Compared with LT8614IUDE#TRPBF, LT8612IUDE#TRPBF offers lower unit cost and simpler layout for single-rail systems; versus MPQ4433AGL-AEC1-Z, it delivers superior light-load efficiency (3µA vs. 17µA), faster transient response (40ns vs. 75ns on-time), and full AEC-Q100 qualification for safety-critical automotive deployment.
Availability
LT8612IUDE#TRPBF is available at Aetrix Electronics and suitable for automotive infotainment, industrial PLC power supplies, and medical patient monitors requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LT8612IUDE#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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving automotive, industrial, communications, and healthcare markets.
The LT8612IUDE#TRPBF belongs to the LT86xx family of ultralow-IQ synchronous buck regulators, designed specifically for automotive and industrial applications demanding high efficiency across wide load ranges and robust operation under extreme voltage transients.
FAQ
What is the guaranteed operating temperature range for LT8612IUDE#TRPBF?
The LT8612IUDE#TRPBF is specified for –40°C to +125°C junction temperature and is AEC-Q100 qualified for automotive Grade I applications. This rating is guaranteed by design, characterization, and statistical process controls across the full range, making LT8612IUDE#TRPBF suitable for under-hood and engine-control module deployments where ambient temperatures exceed 105°C.
How does the BIAS pin improve efficiency in LT8612IUDE#TRPBF?
The BIAS pin on LT8612IUDE#TRPBF allows the internal 3.4V regulator to draw current from VOUT instead of VIN when VBIAS > 3.1V. For 3.3V or higher outputs, connecting BIAS to VOUT reduces input supply current and improves light-load efficiency - a key advantage over regulators without this feature. This configuration is explicitly recommended in the LT8612IUDE#TRPBF datasheet for optimal performance.
Can LT8612IUDE#TRPBF operate with an input voltage below 3.4V?
No - the absolute minimum input voltage for LT8612IUDE#TRPBF is 3.4V, as specified in the Absolute Maximum Ratings and Electrical Characteristics tables. Operation below this voltage is not guaranteed; the EN/UV pin threshold (1.0V) and internal circuitry require sufficient headroom. For sub-3.4V inputs, alternative regulators such as the LT8609 or LT3643 should be evaluated instead of LT8612IUDE#TRPBF.
What is the purpose of the NC pins (25–28) on LT8612IUDE#TRPBF?
The NC pins (25–28) on LT8612IUDE#TRPBF are internally unconnected but must be tied to PCB ground. This practice ensures mechanical stability of the QFN package, improves thermal conduction through the exposed pad, and minimizes EMI susceptibility. Leaving them floating violates the recommended layout guidelines in the LT8612IUDE#TRPBF datasheet and may compromise thermal performance and long-term reliability.
How does LT8612IUDE#TRPBF handle short-circuit conditions?
LT8612IUDE#TRPBF uses peak-current-mode control with cycle-by-cycle current limiting. During a short circuit, the top-FET current limit (7.5–9.7A depending on duty cycle) clamps inductor current, and the oscillator reduces switching frequency (frequency foldback) to limit average power dissipation. The part remains operational without latch-off, recovering automatically when the fault clears - a behavior confirmed in the LT8612IUDE#TRPBF datasheet's "Operation" and "Typical Performance Characteristics" sections.
LT8612IUDE#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)
LT8612IUDE#TRPBF FAQ
1.How can I place an order for LT8612IUDE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8612IUDE#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 LT8612IUDE#TRPBF reliable?
The price and inventory of LT8612IUDE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8612IUDE#TRPBF is usually 5 days.
3.What payment methods are accepted for LT8612IUDE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8612IUDE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8612IUDE#TRPBF?
LT8612IUDE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8612IUDE#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 LT8612IUDE#TRPBF?
For technical support, including LT8612IUDE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8612IUDE#TRPBF requirements.
6.How does Aetrix verify that LT8612IUDE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT8612IUDE#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 LT8612IUDE#TRPBF meets industry standards.
7.What is the process for return or replacement of LT8612IUDE#TRPBF?
All LT8612IUDE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8612IUDE#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 LT8612IUDE#TRPBF part is unused and in its original packaging.
Return procedure for LT8612IUDE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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