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Analog Devices Inc. LT8619IDD#TRPBF
- Part No.:
- LT8619IDD#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
LT8619IDD#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 1.2A 10DFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,901
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Product details
Overview
LT8619IDD#TRPBF 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 via internal compensation, and targets automotive and industrial power supplies requiring ultra-low IQ and high efficiency at light loads.
For engineers reviewing the LT8619IDD#TRPBF datasheet, LT8619IDD#TRPBF pinout, LT8619IDD#TRPBF application, or LT8619IDD#TRPBF equivalent, key selection criteria include its 10-lead 3mm × 3mm DFN package, AEC-Q100 qualification, 700kHz typical switching frequency (RT = 66.5kΩ), 0.8V FB reference (LT8619 variant), and programmable UVLO via EN/UV pin.
Technical Context
The LT8619IDD#TRPBF implements peak current mode control with internal compensation, enabling fast transient response and stable operation with small inductors. Its architecture integrates top and bottom MOSFETs, a 3.3V INTVCC LDO, and a dedicated BIAS pin for efficiency optimization when VOUT ≥ 3.3V.
Burst Mode operation reduces IQ to 6µA at no load while maintaining ≤10mVP-P output ripple; forced continuous mode (via SYNC pin) supports synchronization from 300kHz to 2.2MHz and eliminates low-frequency switching artifacts for EMI-sensitive applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3V to 60V - supports 12V/24V/48V automotive and industrial rails without external pre-regulation. |
| Quiescent Current (Burst Mode) | 6µA at 12VIN/3.3VOUT - enables always-on systems with multi-year battery life. |
| Switching Frequency | 700kHz typical (RT = 66.5kΩ) - balances efficiency, size, and EMI for compact designs. |
| Feedback Reference Voltage | 0.8V (LT8619 variant) - allows precise output programming via external resistor divider. |
| Power Good Accuracy | ±7.5% of regulated VOUT - provides reliable system-level power sequencing and fault detection. |
| Minimum On-Time | 30ns - enables high step-down ratios (e.g., 48V to 3.3V) at high frequencies without pulse skipping. |
| Top Switch RDS(ON) | 0.45Ω - minimizes conduction loss at 0.1A load, supporting high efficiency across wide load range. |
Pinout & Package
LT8619IDD#TRPBF is housed in a thermally enhanced 10-lead 3mm × 3mm plastic DFN package with exposed pad (Pin 11) soldered to PCB ground for low θJA = 43°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 | 1.0V threshold enables shutdown or programmable VIN UVLO using external resistor divider. |
| RT (Pin 5) | Frequency setting | Resistor to GND sets switching frequency (300kHz–2.2MHz); must be ≤ sync frequency when synchronized. |
| PG (Pin 6) | Open-drain power good flag | Asserts high when VFB is within ±7.5% of regulation; requires external pull-up to INTVCC/VOUT. |
| SYNC (Pin 7) | Mode control / clock sync input | GND = Burst Mode; float = pulse-skipping; INTVCC = forced continuous; external clock = synchronized forced continuous. |
| FB (Pin 9) | Feedback input | Regulated to 0.8V; connects to resistor divider tap; phase-lead capacitor (4.7–10pF) recommended. |
| BIAS (Pin 11) | Internal bias supply | Tie to VOUT ≥ 3.3V to reduce IQ and improve efficiency; bypass with 1µF ceramic. |
| INTVCC (Pin 12) | Internal 3.3V LDO output | Powers control logic and drivers; max 20mA; decouple with ≥1µF ceramic to GND. |
| BST (Pin 14) | Bootstrap supply | Drives top MOSFET gate; requires 0.1µF ceramic capacitor between BST and SW. |
| SW (Pin 15) | Switch node | Connects to inductor and BST capacitor; must be minimized on PCB for low EMI and ringing. |
Key Features
| Feature | Design Value |
|---|---|
| Ultralow quiescent current | 6µA in Burst Mode enables >10-year battery life in always-on automotive telematics and sensor nodes. |
| AEC-Q100 qualified | Rated for –40°C to +125°C junction temperature, meeting automotive reliability and stress test requirements. |
| Low EMI Silent Switcher® architecture | Integrated split-pin layout and fast, clean switching edges minimize conducted and radiated emissions. |
| Internal soft-start | 200µs controlled ramp prevents inrush current and output overshoot during startup. |
| Accurate enable threshold | 1.0V EN/UV threshold with 40mV hysteresis ensures robust power sequencing in noisy environments. |
Applications
| Automotive Infotainment Power | Industrial PLC I/O Module |
|---|---|
Use Scenario: Powering display controllers and audio codecs in head units with cold-cranking (4.5V) and load-dump (60V) conditions. IC Role / Device Role / Timing Role: Primary 3.3V/5V buck regulator delivering 1.2A with ultralow IQ during sleep mode. Use Value: Maintains 6µA IQ during vehicle-off state, extending battery life and complying with OEM quiescent current budgets. | Use Scenario: Generating isolated 5V rail for digital I/O buffers in factory automation controllers operating from 24V DC bus. IC Role / Device Role / Timing Role: High-efficiency, wide-input buck converter with programmable UVLO and PG signaling for system health monitoring. Use Value: 30ns min-on-time supports direct 24V-to-5V conversion at 700kHz, eliminating need for cascaded regulators and reducing BOM count. |
| 48V Mild Hybrid Vehicle ECUs | Smart Building Sensor Hub |
Use Scenario: Supplying 3.3V to microcontrollers and CAN transceivers in 48V battery management subsystems. IC Role / Device Role / Timing Role: Synchronous buck regulator with AEC-Q100 qualification and 60V absolute max rating for robust 48V rail handling. Use Value: Withstands 60V transients and maintains 90% efficiency at 0.5A, ensuring thermal stability in sealed ECU enclosures. | Use Scenario: Powering wireless sensor nodes (BLE/Zigbee) with intermittent wake-up cycles in energy-constrained HVAC systems. IC Role / Device Role / Timing Role: Always-on buck regulator operating in Burst Mode to sustain multi-year operation from coin-cell or energy-harvesting sources. Use Value: 10mVP-P ripple at no load avoids false wake-ups in ultra-low-power MCU sleep states. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT8640SIDD#TRPBF | Higher 4A output current, 3.4V–65V input, 2.5µA IQ, same 10-lead DFN package. | Targets higher-power applications (e.g., ADAS cameras); not drop-in due to different FB voltage (0.8V vs 0.6V) and pinout. | Select when >1.2A load or lower IQ is required; verify feedback divider and thermal design. |
| MPQ4420AGL-A-Z | 2A output, 3.3V–60V input, 17µA IQ, 10-pin QFN, non-AEC-Q100. | Suitable for industrial but not automotive; lacks PG flag and SYNC pin for frequency control. | Choose for cost-sensitive non-automotive designs where 6µA IQ and PG signaling are not critical. |
Compared with LT8640SIDD#TRPBF and MPQ4420AGL-A-Z, the LT8619IDD#TRPBF uniquely balances AEC-Q100 compliance, 6µA IQ, integrated PG, and 30ns min-on-time in a compact DFN-making it optimal for space- and efficiency-constrained automotive and industrial point-of-load applications.
Availability
LT8619IDD#TRPBF is available at Aetrix Electronics and suitable for automotive infotainment, industrial PLCs, 48V hybrid vehicle ECUs, and smart building sensor hubs requiring stable component supply, long-term lifecycle support, and AEC-Q100-qualified performance.
Supply support for LT8619IDD#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 precision instrumentation, industrial automation, and automotive markets.
The LT8619 series belongs to Analog Devices' Silent Switcher® monolithic buck regulator product line, engineered specifically for ultra-low EMI and ultralow quiescent current in automotive and industrial power systems.
FAQ
What is the maximum input voltage rating for the LT8619IDD#TRPBF?
The LT8619IDD#TRPBF has an absolute maximum input voltage rating of 60V on the VIN pin, as specified in the Absolute Maximum Ratings table. This allows safe operation across 12V, 24V, and 48V automotive and industrial supply rails, including transient overvoltage events such as load dump. Operation above 60V risks permanent device damage.
Does the LT8619IDD#TRPBF support fixed 5V output without external feedback resistors?
No - the LT8619IDD#TRPBF is the standard LT8619 variant with a 0.8V feedback reference (FB pin), requiring external resistor dividers to set the output voltage. The fixed 5V version is the LT8619-5 (e.g., LT8619EMSE-5#TRPBF), which uses an internal 10MΩ divider and the OUT pin instead of FB. Using LT8619IDD#TRPBF for 5V requires R1/R2 calculation per the datasheet's feedback network equations.
How is the switching frequency programmed on the LT8619IDD#TRPBF?
The switching frequency of the LT8619IDD#TRPBF is set by connecting a resistor (RT) between the RT pin (Pin 5) and GND. With RT = 66.5kΩ, the typical frequency is 700kHz. The relationship is linear: fSW ≈ 1.15MHz × (100kΩ / RT). For synchronization, the RT resistor must be selected so the free-running frequency is ≤ the external clock frequency applied to the SYNC pin.
What thermal considerations apply to the LT8619IDD#TRPBF in its 10-lead DFN package?
The LT8619IDD#TRPBF in the 10-lead 3mm × 3mm DFN package has θJA = 43°C/W and θJC = 10°C/W. To maintain safe junction temperature, the exposed pad (Pin 11) must be soldered to a large PCB copper area tied to GND. For 1.2A continuous operation at 48VIN/5VOUT, thermal simulation or measurement is recommended to ensure TJ stays below 125°C under worst-case ambient and airflow conditions.
Can the LT8619IDD#TRPBF be used in Burst Mode with a 2MHz switching frequency?
No - Burst Mode operation is only available when the SYNC pin is grounded. At 2MHz (RT = 20kΩ), grounding SYNC forces Burst Mode, but the resulting burst frequency drops significantly at light loads and cannot sustain 2MHz switching. For high-frequency, low-ripple operation, use forced continuous mode (SYNC tied to INTVCC or external clock), accepting higher IQ (~3mA). Burst Mode is optimized for <1MHz base frequencies.
LT8619IDD#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 10-WFDFN 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):
- 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:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-DFN (3x3)
LT8619IDD#TRPBF FAQ
1.How can I place an order for LT8619IDD#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8619IDD#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 LT8619IDD#TRPBF reliable?
The price and inventory of LT8619IDD#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8619IDD#TRPBF is usually 5 days.
3.What payment methods are accepted for LT8619IDD#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8619IDD#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8619IDD#TRPBF?
LT8619IDD#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8619IDD#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 LT8619IDD#TRPBF?
For technical support, including LT8619IDD#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8619IDD#TRPBF requirements.
6.How does Aetrix verify that LT8619IDD#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT8619IDD#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 LT8619IDD#TRPBF meets industry standards.
7.What is the process for return or replacement of LT8619IDD#TRPBF?
All LT8619IDD#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8619IDD#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 LT8619IDD#TRPBF part is unused and in its original packaging.
Return procedure for LT8619IDD#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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