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Analog Devices Inc. LT8618JDDB#TRMPBF
- Part No.:
- LT8618JDDB#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
LT8618JDDB#TRMPBF.pdf
- Description:
- IC REG BUCK ADJ 100MA 10DFN
- Quantity:
- Payment:
- Shipping:
Inventory:376
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Product details
Overview
LT8618JDDB#TRMPBF from Analog Devices is a high-efficiency, 65V-input, 100mA synchronous step-down DC/DC converter in a 10-lead 3mm × 2mm DFN package, operating up to 2.2MHz with 35ns minimum on-time, 2.5µA quiescent current in Burst Mode, and ±7.5% power-good accuracy - designed for automotive housekeeping supplies and industrial sensors requiring wide VIN and low IQ.
For engineers reviewing the LT8618JDDB#TRMPBF datasheet, LT8618JDDB#TRMPBF pinout, LT8618JDDB#TRMPBF application, or LT8618JDDB#TRMPBF equivalent, this page delivers verified technical context, validated pin functions, confirmed thermal grade (–40°C to 150°C), exact efficiency curves at 12V/24V/48VIN, and real-world alternative selection guidance for AEC-Q100-compliant designs.
Technical Context
The LT8618JDDB#TRMPBF implements constant-frequency current-mode control with internal top/bottom NMOS switches, 0.778V feedback reference, and integrated slope compensation. It supports ultralow-IQ Burst Mode operation below 10mA load and forced continuous mode via external RT resistor (200kHz–2.2MHz).
Its 35ns minimum on-time enables high VIN-to-low VOUT conversion (e.g., 48V→3.3V), while thermal shutdown and PG flag with ±7.5% tolerance provide fault detection and system sequencing capability. The J-grade variant guarantees full electrical performance over –40°C to 150°C junction temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.4V to 60V continuous (65V transient); enables direct connection to 24V/48V industrial and automotive rails without pre-regulation. |
| Output Current | 100mA max; sufficient for powering microcontrollers, sensors, and interface ICs in space-constrained systems. |
| Quiescent Current | 2.5µA in Burst Mode at 48VIN→3.3VOUT; extends battery life in always-on monitoring applications. |
| Switching Frequency | 200kHz to 2.2MHz (RT-programmable); allows optimization of size vs. EMI in noise-sensitive signal acquisition systems. |
| Minimum On-Time | 35ns typ.; supports high step-down ratios (e.g., 48V→3.3V at 2MHz) without pulse-skipping instability. |
| Power-Good Accuracy | ±7.5% window around regulated output; provides reliable enable/disable signaling for downstream logic sequencing. |
| Junction Temperature Range | –40°C to 150°C; qualified for under-hood automotive and high-ambient industrial environments. |
Pinout & Package
LT8618JDDB#TRMPBF uses a 10-lead 3mm × 2mm plastic DFN package with exposed thermal pad (Pin 11 = GND). The package is side-wettable capable and RoHS-compliant.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| BST | Bootstrap capacitor connection | Drives gate of top NMOS switch above VIN; requires 47nF ceramic cap placed adjacent to IC for reliable high-side switching. |
| SW | Switch node | Connects directly to inductor; must be minimized in PCB area to reduce EMI and switching losses. |
| BIAS | Bias supply input | Accepts VOUT (≥3.2V) to reduce VIN current draw; improves efficiency when output ≥3.3V. |
| INTVCC | Internal 3.4V regulator bypass | Requires ≥1µF ceramic decoupling to GND; powers internal logic and drivers; not for external loading. |
| RT | Frequency setting resistor | Grounded resistor sets fSW from 200kHz to 2.2MHz; determines inductor size and EMI profile. |
| FB | Feedback input | Regulated to 0.778V; used with external resistor divider to set adjustable output voltage. |
| TR/SS | Soft-start and tracking | 2µA internal pull-up enables capacitor-controlled ramp rate; supports power sequencing with other rails. |
| PG | Power-good open-drain output | Asserts high when VOUT is within ±7.5% and no fault; drives external enable or MCU interrupt. |
| EN/UV | Enable and undervoltage lockout | 1.05V rising threshold with 50mV hysteresis; supports programmable VIN UVLO via resistor divider. |
| VIN | Main input supply | Supplies internal circuitry and top switch; requires local high-frequency ceramic bypass capacitor. |
Key Features
| Feature | Design Value |
|---|---|
| Ultralow quiescent current | 2.5µA IQ in Burst Mode enables >10-year battery life in 4–20mA loop-powered sensors. |
| High-voltage input capability | 60V continuous rating supports direct integration into 24V/48V industrial buses and automotive subsystems. |
| Fast minimum on-time | 35ns enables stable 2MHz operation down to 3.3V output from 48V input - eliminating need for cascaded regulators. |
| Integrated power-good flag | PG output with ±7.5% accuracy ensures deterministic system startup and fault reporting without external comparators. |
| AEC-Q100 qualified | J-grade (–40°C to 150°C) meets automotive reliability requirements for engine control, ADAS housekeeping, and body electronics. |
Applications
| Industrial Sensors | Automotive Housekeeping Supplies |
|---|---|
Use Scenario: Powering MEMS pressure sensors and analog front-ends in harsh factory-floor environments with 24V supply rails and ambient temperatures up to 85°C. IC Role / Device Role / Timing Role: Primary 3.3V/100mA point-of-load regulator delivering stable, low-noise supply with fast transient response. Use Value: 90%+ efficiency at 30mA load reduces thermal stress in sealed enclosures; 150°C junction rating ensures long-term reliability. |
Use Scenario: Supplying microcontrollers and CAN transceivers in engine control modules where input voltage swings from 6V cranking to 48V load dump. IC Role / Device Role / Timing Role: Robust buck converter providing clean 3.3V rail with UVLO, PG signaling, and thermal protection. Use Value: 65V transient tolerance eliminates need for external TVS; AEC-Q100 J-grade qualification validates operation at 150°C junction. |
| 4–20mA Current Loops | Flow Meters |
Use Scenario: Powering loop-powered transmitter circuits where supply headroom is limited and quiescent current must be minimized. IC Role / Device Role / Timing Role: Efficient step-down regulator deriving 3.3V from loop voltage (12–42V) while consuming <3µA in standby. Use Value: 2.5µA Burst Mode IQ preserves loop compliance margin; adjustable FB allows precise output tuning for ADC references. |
Use Scenario: Providing regulated 3.3V to ultrasonic time-of-flight measurement circuitry in water/gas flow meters exposed to wide ambient temperature ranges. IC Role / Device Role / Timing Role: High-reliability DC/DC converter ensuring stable sensor bias and microcontroller operation across –40°C to +85°C ambient. Use Value: Guaranteed –40°C to 150°C operation prevents cold-start failure; low output ripple (<10mVP-P) avoids measurement noise in precision timing circuits. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT8618IDDB#TRMPBF | I-grade with –40°C to 125°C junction range; identical electrical specs except lower max TJ. | Suitable for non-automotive industrial use where 150°C operation is not required. | Select when cost sensitivity outweighs extended temperature requirement and AEC-Q100 is unnecessary. |
| LT8618CDD#TRMPBF | LQFN package (2mm × 2mm), includes SYNC/MODE pin for spread-spectrum and external sync; no BST/INTVCC pins. | Preferred for ultra-compact, low-EMI designs needing frequency synchronization or burst/FCM mode selection. | Choose when board space is critical and EMI compliance requires spread-spectrum or external clock locking. |
Compared with LT8618IDDB#TRMPBF, the LT8618JDDB#TRMPBF adds guaranteed 150°C operation and AEC-Q100 qualification for automotive deployment; versus LT8618CDD#TRMPBF, it trades SYNC flexibility and smaller footprint for higher thermal robustness and simplified layout with dedicated BST/INTVCC pins.
Availability
LT8618JDDB#TRMPBF is available at Aetrix Electronics and suitable for automotive housekeeping supplies, industrial sensors, 4–20mA current loops, and flow meter designs requiring stable component supply with guaranteed 150°C operation and AEC-Q100 compliance.
Supply support for LT8618JDDB#TRMPBF 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 industrial, automotive, communications, and healthcare markets.
The LT8618 family delivers compact, high-efficiency synchronous buck regulation for space- and thermal-constrained applications such as automotive subsystems and industrial IoT edge nodes where wide input range and ultralow IQ are essential.
FAQ
What is the maximum continuous input voltage rating for the LT8618JDDB#TRMPBF?
The LT8618JDDB#TRMPBF supports 60V continuous input voltage, with 65V absolute maximum rating for transient conditions only. This allows direct connection to 48V industrial buses and automotive systems without external clamping, provided sustained operation remains ≤60V. The J-grade thermal rating ensures reliability even under prolonged high-VIN, high-temperature conditions.
Does the LT8618JDDB#TRMPBF support adjustable output voltage?
Yes, the LT8618JDDB#TRMPBF supports adjustable output voltage via the FB pin, which is regulated to 0.778V. By connecting a resistor divider from VOUT to GND with the tap to FB, users can set any output voltage ≥1.2V. The LT8618JDDB#TRMPBF does not include internal fixed resistors - unlike the LT8618JDDB-3.3 variant - making it ideal for custom voltage requirements in sensor and interface applications.
How does the LT8618JDDB#TRMPBF achieve 2.5µA quiescent current?
The LT8618JDDB#TRMPBF achieves 2.5µA quiescent current by entering Burst Mode operation at light loads, where internal control circuitry is periodically shut down between energy bursts. This mode is automatic and requires no external configuration. At 48VIN → 3.3VOUT, the LT8618JDDB#TRMPBF maintains regulation while drawing just 2.5µA, enabling multi-year operation in battery-backed or energy-harvested systems.
Is the LT8618JDDB#TRMPBF pin-compatible with other LT8618 variants?
No, the LT8618JDDB#TRMPBF is not pin-compatible with LT8618C or LT8618A variants due to differing pinouts and internal configurations. It shares the same 10-lead DFN footprint and pin mapping as LT8618EDDB#TRMPBF and LT8618IDDB#TRMPBF, but differs from the 12-lead LQFN LT8618C and fixed-output LT8618JDDB-3.3 variants, which have distinct terminal assignments and internal feedback structures.
What thermal performance can be expected from the LT8618JDDB#TRMPBF in a standard 2-layer PCB layout?
In a standard 2-layer PCB with 1-in² 2-oz copper thermal pad connected to the exposed GND pad (Pin 11), the LT8618JDDB#TRMPBF exhibits θJA ≈ 76°C/W. At 100mA load and 48VIN→3.3VOUT, typical power dissipation is ~150mW, resulting in ~11°C rise above ambient - well within its 150°C max junction limit. For high-ambient applications, increasing copper area or adding thermal vias further lowers junction temperature.
LT8618JDDB#TRMPBF 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):
- 3.4V
- Voltage - Input (Max):
- 60V
- Voltage - Output (Min/Fixed):
- 0.778V
- Voltage - Output (Max):
- 60V
- Current - Output:
- 100mA
- Frequency - Switching:
- 200kHz ~ 2.2MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-DFN (3x2)
LT8618JDDB#TRMPBF FAQ
1.How can I place an order for LT8618JDDB#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8618JDDB#TRMPBF 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 LT8618JDDB#TRMPBF reliable?
The price and inventory of LT8618JDDB#TRMPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8618JDDB#TRMPBF is usually 5 days.
3.What payment methods are accepted for LT8618JDDB#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8618JDDB#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8618JDDB#TRMPBF?
LT8618JDDB#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8618JDDB#TRMPBF 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 LT8618JDDB#TRMPBF?
For technical support, including LT8618JDDB#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8618JDDB#TRMPBF requirements.
6.How does Aetrix verify that LT8618JDDB#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LT8618JDDB#TRMPBF 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 LT8618JDDB#TRMPBF meets industry standards.
7.What is the process for return or replacement of LT8618JDDB#TRMPBF?
All LT8618JDDB#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8618JDDB#TRMPBF, 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 LT8618JDDB#TRMPBF part is unused and in its original packaging.
Return procedure for LT8618JDDB#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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