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Analog Devices Inc. LT8619IDD#PBF
- Part No.:
- LT8619IDD#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
LT8619IDD#PBF.pdf
- Description:
- IC REG BUCK ADJ 1.2A 10DFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,857
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Product details
Overview
LT8619IDD#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 in DFN-10 package, and targets automotive 12V/24V/48V systems requiring ultra-low IQ and low EMI.
For engineers reviewing the LT8619IDD#PBF datasheet, LT8619IDD#PBF pinout, LT8619IDD#PBF application, or LT8619IDD#PBF equivalent, key selection criteria include its 6µA no-load IQ at 12VIN→3.3VOUT, 10mVP-P ripple in Burst Mode, programmable 300kHz–2.2MHz switching frequency via RT resistor, AEC-Q100 qualification, and thermal performance enabled by exposed-pad DFN-10 packaging.
Technical Context
The LT8619IDD#PBF implements peak current mode control with internal compensation, enabling fast transient response and stable operation with small inductors. Its 30ns minimum on-time supports high VIN/VOUT ratios (e.g., 48V→3.3V) at 2MHz switching, while the integrated top/bottom MOSFETs feature 0.45Ω/0.22Ω RDS(ON) for high efficiency across load range.
Burst Mode operation shuts down control circuitry between energy bursts to achieve 6µA IQ; forced continuous mode (via SYNC pin tied to INTVCC) or external clock synchronization enables fixed-frequency operation. The EN/UV pin provides accurate 1V threshold for VIN undervoltage lockout or shutdown, reducing input current to <0.6µA.
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 4.5V and load-dump 60V transients. |
| Quiescent Current | 6µA at 12VIN→3.3VOUT in Burst Mode - enables >10-year battery life in always-on automotive modules. |
| Output Current | 1.2A continuous - sufficient for powering microcontrollers, sensors, and CAN transceivers in embedded systems. |
| Switching Frequency | 300kHz to 2.2MHz (RT-programmable) - allows optimization of size (high-freq) vs. efficiency (mid-freq) and EMI filtering. |
| Power Good Accuracy | ±7.5% window on FB/OUT - ensures reliable system reset and sequencing without external monitoring circuitry. |
| Min On-Time | 30ns - enables 48V→3.3V conversion at 2MHz without pulse-skipping, critical for compact high-density designs. |
| Package | 10-lead 3mm × 3mm DFN with exposed pad - achieves θJC = 10°C/W for direct PCB thermal conduction in space-constrained layouts. |
Pinout & Package
LT8619IDD#PBF uses a thermally enhanced 10-lead (3mm × 3mm) plastic DFN package with exposed pad (Pin 11) soldered to PCB ground for low thermal resistance (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 placed adjacent to pin. |
| EN/UV (Pin 4) | Enable / UVLO input | 1V threshold enables precise input voltage monitoring; pull to VIN for always-on operation or use resistor divider for custom UVLO. |
| RT (Pin 5) | Frequency setting | Resistor to GND sets switching frequency (300kHz–2.2MHz); value must be selected before sync source if synchronizing. |
| PG (Pin 6) | Open-drain power good | Asserts high when VOUT is within ±7.5%; requires external pull-up to INTVCC, VOUT, or ≤6V supply. |
| SYNC (Pin 7) | Mode control / sync input | Ground = 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 for adjustable output; 4.7–10pF phase-lead cap required between FB and VOUT. |
| BIAS (Pin 11) | Bias supply input | When tied to VOUT ≥3.1V, powers internal LDO to reduce VIN current and improve efficiency. |
| INTVCC (Pin 12) | Internal 3.3V LDO output | Supplies gate drivers and logic; max 20mA; decouple with ≥1µF ceramic capacitor to GND. |
| BST (Pin 14) | Bootstrap supply | Drives top MOSFET gate; requires 0.1µF ceramic capacitor between BST and SW pins, placed close to IC. |
| SW (Pin 15) | Switch node | Connects to inductor and BST capacitor; must be minimized on PCB to reduce EMI and switching losses. |
Key Features
| Feature | Design Value |
|---|---|
| Ultralow 6µA quiescent current | Enables >10-year battery standby in automotive telematics and ADAS always-on modules without compromising regulation. |
| 30ns minimum on-time | Supports high step-down ratios (e.g., 48V→3.3V) at 2MHz, eliminating need for cascaded converters in 48V EV subsystems. |
| AEC-Q100 qualified | Rated for –40°C to +125°C junction temperature, meeting automotive reliability requirements for under-hood and infotainment applications. |
| Low EMI Silent Switcher® architecture | Integrated split-pin layout and fast, clean switching edges minimize conducted and radiated emissions without shielding. |
| Internal soft-start and compensation | Reduces external component count; eliminates need for external compensation network or soft-start timing capacitor. |
Applications
| Automotive Infotainment Power | Industrial Sensor Node Supply |
|---|---|
Use Scenario: Powering SoC, display interface, and audio codec in head-unit with 12V battery input subject to cold-crank and load-dump transients. IC Role / Device Role / Timing Role: Primary 3.3V/1.2A buck regulator delivering stable, low-noise supply with Burst Mode IQ <6µA during sleep states. Use Value: Eliminates need for external UVLO and PG monitoring; AEC-Q100 rating ensures compliance with automotive qualification standards. | Use Scenario: Providing regulated 5V supply to wireless sensor nodes operating from 24V industrial bus with intermittent wake-up cycles. IC Role / Device Role / Timing Role: Fixed 5V output buck converter (LT8619-5 variant) with programmable frequency and SYNC-controlled mode transitions. Use Value: 30ns min-on-time enables direct 24V→5V conversion at 2MHz, reducing solution size versus two-stage approaches. |
| 48V Mild Hybrid Vehicle ECUs | Medical Portable Diagnostic Equipment |
Use Scenario: Generating 3.3V/1.2A for MCU and CAN FD transceiver in 48V battery management unit exposed to high ambient temperatures. IC Role / Device Role / Timing Role: High-efficiency synchronous buck with thermal pad for direct PCB heat sinking and 60V absolute max rating for transient protection. Use Value: Exposed-pad DFN-10 package achieves θJC = 10°C/W, enabling operation at full load up to 125°C junction temperature. | Use Scenario: Powering low-power imaging sensor and ADC in portable ultrasound device powered by Li-ion battery with wide VIN range. IC Role / Device Role / Timing Role: Input-capable buck regulator accepting 3V–60V, supporting both battery (3.6V) and AC adapter (24V) inputs without redesign. Use Value: Single-part solution replaces multiple regulators; 10mVP-P ripple in Burst Mode avoids noise coupling into analog signal chain. |
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#PBF | Higher 4A output current, 2.5µA IQ, same 60V rating and DFN-10 package; adds spread-spectrum modulation. | Targets higher-current loads (e.g., multi-rail PMIC front-end); not drop-in due to different FB divider ratio and SS pin. | Select when >1.2A output or lower EMI is required; verify feedback network and layout changes for SS functionality. |
| MPQ4420AGL-A-Z | 40V max input, 2A output, 17µA IQ, QFN-10 package; lacks SYNC pin and AEC-Q100 qualification. | Suitable for cost-sensitive industrial supplies where 60V rating and automotive qualification are unnecessary. | Choose for non-automotive 12V/24V systems with relaxed IQ and transient requirements; verify thermal derating at 1.2A. |
Compared with LT8640SIDD#PBF and MPQ4420AGL-A-Z, the LT8619IDD#PBF uniquely balances ultra-low 6µA IQ, 60V capability, AEC-Q100 qualification, and 10-lead DFN footprint-making it optimal for space-constrained, battery-sensitive automotive modules where every microamp and volt matters.
Availability
LT8619IDD#PBF is available at Aetrix Electronics and suitable for automotive infotainment, 48V hybrid vehicle ECUs, and industrial sensor node power supplies requiring stable component supply, long-term lifecycle support, and AEC-Q100-compliant sourcing.
Supply support for LT8619IDD#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 precision instrumentation, industrial automation, and automotive markets.
The LT8619 belongs to the Silent Switcher® buck regulator product line, engineered specifically for ultra-low EMI and ultralow quiescent current in automotive and industrial power systems demanding high reliability and compact size.
FAQ
What is the maximum input voltage rating for the LT8619IDD#PBF?
The LT8619IDD#PBF has an absolute maximum input voltage rating of 60V on the VIN pin, making it suitable for automotive applications subject to load-dump transients. Continuous operation is specified from 3V to 60V, and the device includes overvoltage protection that disables the top switch if FB exceeds 0.83V to guard against output overshoot. This 60V rating is confirmed in the Absolute Maximum Ratings table and applies directly to the LT8619IDD#PBF variant.
Does the LT8619IDD#PBF support fixed 5V output without external resistors?
No, the LT8619IDD#PBF does not provide fixed 5V output. It is the adjustable version (LT8619), requiring an external resistor divider on the FB pin to set the output voltage. The fixed 5V variant is designated LT8619-5 (e.g., LT8619EMSE-5#PBF). The LT8619IDD#PBF's FB pin is regulated to 0.8V, so a standard 3.3V or 5V output requires appropriate R1/R2 values per the datasheet's feedback network equations.
How does the SYNC pin affect operating mode and efficiency in the LT8619IDD#PBF?
The SYNC pin on the LT8619IDD#PBF selects among three modes: grounded = Burst Mode (6µA IQ, lowest light-load efficiency), floating = pulse-skipping mode (higher IQ than Burst but lower ripple), and tied to INTVCC = forced continuous mode (fixed frequency, highest heavy-load efficiency). External clock input enables synchronization while maintaining forced continuous operation. These behaviors are explicitly defined in the Pin Functions and OPERATION sections of the LT8619/LT8619-5 datasheet Rev. C.
Is the LT8619IDD#PBF AEC-Q100 qualified, and what grade does it meet?
Yes, the LT8619IDD#PBF is AEC-Q100 qualified for automotive applications. Per the ORDER INFORMATION table in the datasheet, the "I" grade (e.g., LT8619IDD#PBF) is rated for –40°C to +125°C operating junction temperature and meets AEC-Q100 requirements. This qualification is explicitly stated under FEATURES and verified in the Automotive Products section, confirming suitability for under-hood and infotainment systems.
What thermal performance can be expected from the LT8619IDD#PBF in its DFN-10 package?
The LT8619IDD#PBF in its 10-lead 3mm × 3mm DFN package achieves θJA = 43°C/W and θJC = 10°C/W when the exposed pad (Pin 11) is properly soldered to a large PCB ground plane. This enables full 1.2A output at 125°C junction temperature in typical layouts. Thermal performance is validated in the Datasheet Rev. C Package Description and confirmed by the recommended layout guidelines requiring direct thermal connection of the exposed pad to PCB copper.
LT8619IDD#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:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-DFN (3x3)
LT8619IDD#PBF FAQ
1.How can I place an order for LT8619IDD#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8619IDD#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 LT8619IDD#PBF reliable?
The price and inventory of LT8619IDD#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8619IDD#PBF is usually 5 days.
3.What payment methods are accepted for LT8619IDD#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8619IDD#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8619IDD#PBF?
LT8619IDD#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8619IDD#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 LT8619IDD#PBF?
For technical support, including LT8619IDD#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8619IDD#PBF requirements.
6.How does Aetrix verify that LT8619IDD#PBF is sourced from the original manufacturer or authorized distributors?
All LT8619IDD#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 LT8619IDD#PBF meets industry standards.
7.What is the process for return or replacement of LT8619IDD#PBF?
All LT8619IDD#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8619IDD#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 LT8619IDD#PBF part is unused and in its original packaging.
Return procedure for LT8619IDD#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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