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Analog Devices Inc. LT8619EDD#PBF
- Part No.:
- LT8619EDD#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
LT8619EDD#PBF.pdf
- Description:
- IC REG BUCK ADJ 1.2A 10DFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,766
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Product details
Overview
LT8619EDD#PBF from Analog Devices is a 60V, 1.2A synchronous monolithic buck regulator with 6µA quiescent current in Burst Mode, 30ns minimum on-time, and ±7.5% power-good accuracy. It operates from 3V to 60V input, delivers regulated output up to 1.2A, and features internal compensation, soft-start, and SYNC-controlled mode selection-ideal for automotive 12V/24V/48V systems requiring ultra-low standby power.
For engineers reviewing the LT8619EDD#PBF datasheet, LT8619EDD#PBF pinout, LT8619EDD#PBF application, or LT8619EDD#PBF equivalent, key selection criteria include its 6µA no-load IQ, 30ns min-on-time for high VIN/VOUT ratios, 10mVP-P ripple in Burst Mode, AEC-Q100 qualification, and DFN-10 (3mm × 3mm) thermally enhanced package with exposed GND pad.
Technical Context
The LT8619EDD#PBF implements peak current-mode control with internal compensation, enabling fast transient response and stable operation with small inductors. Its oscillator supports programmable frequency (300kHz–2.2MHz) via RT resistor or external synchronization, and it features dual-mode operation: ultralow-IQ Burst Mode (6µA) for light loads and forced continuous mode for low-noise or EMI-sensitive applications.
It integrates top and bottom MOSFETs with 0.45Ω/0.22Ω typical RDS(ON), uses BIAS pin sourcing to reduce VIN current when VOUT ≥ 3.3V, and includes overvoltage protection (0.83V FB threshold), UVLO with 1V EN/UV threshold and 40mV hysteresis, and precise ±7.5% PG window referenced to regulated output.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3V to 60V - supports wide-range industrial and automotive battery inputs including cold-crank and load-dump conditions. |
| Output Current | 1.2A continuous - sufficient for powering microcontrollers, sensors, and interface ICs in embedded systems. |
| Quiescent Current | 6µA at 12VIN→3.3VOUT in Burst Mode - enables >10-year battery life in always-on automotive modules. |
| Min On-Time | 30ns - allows high step-down ratios (e.g., 48V→3.3V) without pulse-skipping instability. |
| Power Good Accuracy | ±7.5% of regulated output - provides reliable system reset and sequencing in safety-critical applications. |
| Switching Frequency | 300kHz to 2.2MHz (RT-programmable or SYNC-synchronized) - enables compact magnetics and EMI optimization across designs. |
| Package | 10-lead 3mm × 3mm DFN with exposed thermal pad - achieves θJC = 10°C/W for high-power-density thermal management. |
Pinout & Package
LT8619EDD#PBF is housed in a 10-lead (3mm × 3mm) plastic DFN package with exposed pad (Pin 11), which must be soldered to PCB ground for optimal thermal performance (θJA = 43°C/W, θJC = 10°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pin 2) | Main input supply | Supplies internal circuitry and top switch; requires local 10µF+ ceramic bypass capacitor. |
| EN/UV (Pin 4) | Enable / input undervoltage lockout | 1V rising threshold; enables shutdown below 0.56V (IQ < 0.6µA) or UVLO programming via resistor divider. |
| RT (Pin 5) | Frequency setting | Resistor-to-GND sets switching frequency (300kHz–2.2MHz); determines light-load transition point in Burst Mode. |
| PG (Pin 6) | Open-drain power good flag | Asserts high when FB/OUT is within ±7.5% of regulation; requires external pull-up to INTVCC, VOUT, or ≤6V rail. |
| SYNC (Pin 7) | Mode control & sync input | Ground = Burst Mode; float = pulse-skipping; INTVCC or external clock = forced continuous/sync mode. |
| FB (Pin 9) | Feedback input | Regulated to 0.8V; connects to resistor divider for adjustable output (LT8619 variant; LT8619-5 uses fixed OUT pin). |
| BIAS (Pin 11) | Bias supply input | When tied to VOUT ≥ 3.3V, powers internal LDO and drivers, reducing VIN current and improving efficiency. |
| INTVCC (Pin 12) | Internal 3.3V LDO output | Supplies control logic and gate drivers; max 20mA; requires ≥1µF ceramic decoupling to GND. |
| BST (Pin 14) | Bootstrap supply | Drives top MOSFET gate; requires 0.1µF ceramic capacitor between BST and SW pins. |
| SW (Pin 15) | Switch node | Connects to inductor and BST capacitor; critical high-di/dt node requiring minimized PCB loop area. |
Key Features
| Feature | Design Value |
|---|---|
| Ultralow 6µA quiescent current | Enables multi-year battery operation in always-on telematics, ADAS sensors, and CAN/LIN nodes. |
| 30ns minimum on-time | Supports direct 48V→3.3V conversion without intermediate stages, reducing BOM count and board space. |
| AEC-Q100 qualified (Grade 1) | Validated for automotive underhood and cabin applications (-40°C to +125°C junction temperature). |
| 10mVP-P output ripple in Burst Mode | Meets noise-sensitive analog sensor and RF module requirements without additional post-regulation filtering. |
| Internal soft-start and compensation | Eliminates need for external compensation components and reduces design cycle time for robust startup. |
Applications
| Automotive Infotainment Power | Industrial Sensor Node Supply |
|---|---|
Use Scenario: Powering display controllers, audio codecs, and USB hubs in vehicle head units with 12V battery input subject to cold-crank transients. IC Role / Device Role / Timing Role: Primary 3.3V/5V buck converter delivering 1.2A with Burst Mode IQ < 6µA during sleep states. Use Value: Maintains system readiness during vehicle-off periods while meeting OEM 100µA total module leakage budgets. | Use Scenario: Providing regulated 3.3V supply to wireless sensor transceivers (LoRaWAN, NB-IoT) deployed in remote industrial sites. IC Role / Device Role / Timing Role: High-efficiency DC/DC converter operating from wide-input 12–48V DC rails with minimal self-heating in sealed enclosures. Use Value: Enables >10-year battery life using primary Li-SOCl₂ cells by minimizing no-load consumption and supporting deep sleep modes. |
| 48V Mild Hybrid Vehicle ECUs | Medical Portable Diagnostic Equipment |
Use Scenario: Generating 5V/3.3V rails for engine control modules and battery management systems in 48V stop-start architectures. IC Role / Device Role / Timing Role: Input-stage buck regulator handling 60V transients and delivering 1.2A with 30ns min-on-time for 48V→5V conversion. Use Value: Eliminates need for pre-regulator stages, reducing solution size and cost while maintaining AEC-Q100 compliance. | Use Scenario: Powering low-noise analog front-ends and microcontrollers in handheld ultrasound or glucose monitors with single-cell lithium batteries. IC Role / Device Role / Timing Role: Ultra-low-noise, high-PSRR buck regulator operating in forced continuous mode to avoid Burst Mode switching artifacts. Use Value: Achieves <10mVP-P output ripple at no load and maintains stability across battery discharge (3.0–4.2V), ensuring signal integrity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT8640SEDD#PBF | Higher 4A output current, 2.5µA IQ, same 60V rating and DFN-10 package; adds spread-spectrum EMI reduction. | Targeted at higher-current applications (e.g., ADAS camera modules) where 1.2A is insufficient. | Select when >1.2A output or lower EMI is required; pin-compatible but larger thermal footprint due to higher power dissipation. |
| TPS54560QDGQRQ1 | 45V max input, 5A output, 14µA IQ, SOIC-8 package; lacks Burst Mode, uses external compensation. | Suitable for cost-sensitive automotive body electronics where 60V rating and ultralow IQ are not mandatory. | Choose for simpler designs needing higher current and lower BOM cost, accepting higher IQ and reduced input voltage margin. |
Compared with LT8640SEDD#PBF and TPS54560QDGQRQ1, the LT8619EDD#PBF uniquely balances 60V capability, 1.2A output, and 6µA IQ in a compact DFN-10 package-making it optimal for space-constrained, battery-sensitive automotive and industrial applications where neither higher current nor lower cost is the primary driver.
Availability
LT8619EDD#PBF is available at Aetrix Electronics and suitable for automotive infotainment systems, industrial sensor nodes, 48V mild hybrid ECUs, and portable medical diagnostics requiring stable component supply, long-lifecycle support, and AEC-Q100-compliant performance.
Supply support for LT8619EDD#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 LT8619EDD#PBF belongs to Analog Devices' Power by Linear™ family of high-efficiency, high-voltage DC/DC regulators designed specifically for automotive and industrial applications demanding ultralow quiescent current, wide input range, and robust transient performance.
FAQ
What is the maximum input voltage rating for the LT8619EDD#PBF?
The LT8619EDD#PBF has an absolute maximum input voltage rating of 60V on the VIN pin, with guaranteed operation from 3V to 60V. This enables use in 48V automotive systems and industrial supplies subject to load-dump transients. Exceeding 60V may cause permanent damage per Absolute Maximum Ratings.
Does the LT8619EDD#PBF support fixed 5V output without external feedback resistors?
No-the LT8619EDD#PBF is the standard LT8619 variant with adjustable output via FB pin (0.8V reference). For fixed 5V output, the LT8619-5 variant (e.g., LT8619EMSE-5#PBF) uses the OUT pin instead of FB and integrates an internal 10MΩ divider. The LT8619EDD#PBF requires external R1/R2 to set VOUT.
How does the SYNC pin affect operating mode and efficiency in the LT8619EDD#PBF?
The SYNC pin configures three distinct modes: grounding enables ultralow-IQ Burst Mode (6µA), floating enables pulse-skipping mode (higher IQ, lower ripple), and connecting to INTVCC or an external clock forces continuous conduction. Efficiency drops ~2–3% in forced continuous mode vs. Burst Mode at light loads due to higher switching losses.
What thermal considerations apply to the LT8619EDD#PBF in its DFN-10 package?
The LT8619EDD#PBF's DFN-10 package features an exposed GND pad (Pin 11) that must be soldered to a thermal pad on the PCB. With θJC = 10°C/W, proper copper pour and vias under the pad are essential to maintain junction temperature ≤125°C at full 1.2A load. Thermal derating is required above 85°C ambient.
Is the LT8619EDD#PBF qualified for automotive applications?
Yes-the LT8619EDD#PBF is AEC-Q100 qualified (Grade 1, –40°C to +125°C junction temperature) and specified for automotive use. It meets stringent reliability, ESD, and transient immunity requirements for under-hood and cabin applications, including 12V, 24V, and 48V vehicle electrical systems.
LT8619EDD#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 10-WFDFN 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):
- 3V
- Voltage - Input (Max):
- 60V
- Voltage - Output (Min/Fixed):
- 0.8V
- Voltage - Output (Max):
- 59.4V
- Current - Output:
- 1.2A
- Frequency - Switching:
- 300kHz ~ 2.2MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- 0°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-DFN (3x3)
LT8619EDD#PBF FAQ
1.How can I place an order for LT8619EDD#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8619EDD#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 LT8619EDD#PBF reliable?
The price and inventory of LT8619EDD#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8619EDD#PBF is usually 5 days.
3.What payment methods are accepted for LT8619EDD#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8619EDD#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8619EDD#PBF?
LT8619EDD#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8619EDD#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 LT8619EDD#PBF?
For technical support, including LT8619EDD#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8619EDD#PBF requirements.
6.How does Aetrix verify that LT8619EDD#PBF is sourced from the original manufacturer or authorized distributors?
All LT8619EDD#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 LT8619EDD#PBF meets industry standards.
7.What is the process for return or replacement of LT8619EDD#PBF?
All LT8619EDD#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8619EDD#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 LT8619EDD#PBF part is unused and in its original packaging.
Return procedure for LT8619EDD#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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