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Analog Devices Inc. LT8618JDDB#TRPBF
- Part No.:
- LT8618JDDB#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
LT8618JDDB#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 100MA 10DFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,076
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Product details
Overview
LT8618JDDB#TRPBF from Analog Devices is a high-efficiency, 65V-input synchronous step-down DC/DC regulator delivering up to 100mA at 3.3V output with 2.5µA quiescent current in Burst Mode, 35ns minimum on-time, and operation up to 2.2MHz. It features internal compensation, soft-start, power-good flag, and AEC-Q100 qualification for automotive housekeeping supplies.
For engineers reviewing the LT8618JDDB#TRPBF datasheet, LT8618JDDB#TRPBF pinout, LT8618JDDB#TRPBF application, or LT8618JDDB#TRPBF equivalent, key selection criteria include input voltage range (3.4–60V), thermal grade (–40°C to 150°C junction), fixed 3.3V output, DFN-10 package, and ultralow IQ regulation under 48VIN.
Technical Context
The LT8618JDDB#TRPBF implements constant-frequency current-mode control with integrated top/bottom NMOS switches, enabling high efficiency across wide load ranges. Its 35ns minimum on-time supports high VIN-to-VOUT ratios (e.g., 48V to 3.3V) without pulse-skipping artifacts.
Burst Mode operation reduces quiescent current to 2.5µA while maintaining regulation; forced continuous mode is available via external resistor network on EN/UV. The device includes internal 0.778V reference, ±7.5% PG threshold, and thermal shutdown at 150°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.4V to 60V continuous (65V transient); enables direct 24V/48V industrial rail regulation without pre-regulation. |
| Output Voltage | Fixed 3.3V ±3% over temperature and line; eliminates external feedback resistors and improves accuracy vs adjustable variants. |
| Max Output Current | 100mA continuous; sufficient for powering microcontrollers, sensors, and interface ICs in space-constrained systems. |
| Quiescent Current | 2.5µA in Burst Mode at 48VIN→3.3VOUT; critical for battery-backed or always-on IoT sensor nodes. |
| Switching Frequency | 200kHz to 2.2MHz (RT-programmable); allows optimization of size (high fSW) vs EMI (low fSW) without changing layout. |
| Min On-Time | 35ns typical; supports 48V-to-3.3V conversion at 2MHz without duty-cycle limitation or frequency foldback. |
| Operating Junction Temp | –40°C to 150°C; qualified for under-hood automotive and high-ambient industrial environments. |
Pinout & Package
LT8618JDDB#TRPBF uses a 10-lead 3mm × 2mm plastic DFN package with exposed thermal pad (Pin 11 = GND). The package supports side-wettable leads for automated optical inspection and has θJA = 76°C/W.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| BST | Bootstrap supply for high-side gate driver | Requires 47nF ceramic capacitor to SW; enables full enhancement of top NMOS at high VIN/VOUT ratios. |
| SW | Switch node | Connects directly to inductor; must be minimized in PCB area to reduce EMI and switching losses. |
| BIAS | Efficiency-optimized bias supply input | Tie to VOUT (3.3V) to reduce VIN current draw; lowers total system power consumption. |
| INTVCC | Internal 3.4V regulator bypass | Decouple with ≥1µF ceramic cap; powers gate drivers and control logic; sourcing shifts to BIAS if >3.2V. |
| RT | Frequency programming input | Resistor to GND sets fSW from 200kHz to 2.2MHz; enables EMI compliance tuning without component change. |
| OUT | Fixed 3.3V output and feedback node | Direct connection point for output capacitor; internal resistor divider eliminates external components. |
| TR/SS | Soft-start and tracking control | Capacitor to GND sets output ramp rate; supports power sequencing with other rails in multi-rail systems. |
| PG | Power-good open-drain flag | Asserts high when VOUT is within ±7.5% of 3.3V and no fault; used for processor reset or system enable sequencing. |
| EN/UV | Enable and input undervoltage lockout | 1.05V rising threshold with 50mV hysteresis; supports programmable VIN UVLO using external resistor divider. |
| VIN | Main input power supply | Must be locally bypassed with low-ESR capacitor; connects to internal top switch and control circuitry. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade 1 qualification | Validated for automotive housekeeping applications with guaranteed operation from –40°C to +150°C junction. |
| Ultralow 2.5µA Burst Mode IQ | Enables >10-year battery life in 4–20mA loop-powered sensors operating from 48V supply. |
| 35ns minimum on-time | Permits direct 48V-to-3.3V conversion at 2MHz, avoiding bulky low-frequency magnetics and reducing solution size by >40%. |
| Integrated soft-start and tracking | TR/SS pin enables controlled output ramp and synchronization with other regulators-critical for FPGA/CPU core sequencing. |
| ±7.5% power-good accuracy | Ensures reliable downstream system enable timing without external monitoring circuitry. |
| Internal compensation | Eliminates external compensation network, reducing BOM count and design validation effort for standard 3.3V loads. |
Applications
| Industrial Sensor Node | Automotive Body Controller |
|---|---|
Use Scenario: Powering MEMS pressure sensor, ADC, and BLE radio in a sealed IP67 flow meter enclosure. IC Role / Device Role / Timing Role: Primary 3.3V housekeeping supply regulating from 24V vehicle battery with cold-crank tolerance. Use Value: 2.5µA quiescent current extends battery backup life; 150°C rating ensures reliability near engine bay heat sources. |
Use Scenario: Supplying microcontroller, CAN transceiver, and LED drivers in door module with 12V nominal battery input. IC Role / Device Role / Timing Role: Fixed-output buck converter providing stable 3.3V rail during load-dump (65V transient) and cranking (6V min). Use Value: AEC-Q100 qualification and 60V continuous rating eliminate need for external TVS/clamping; PG flag sequences MCU boot. |
| 4–20mA Loop-Powered Transmitter | IIoT Edge Gateway |
Use Scenario: Providing isolated 3.3V logic supply from 4–20mA loop using passive current-to-voltage conversion. IC Role / Device Role / Timing Role: Ultra-low-IQ step-down regulator converting ~16V derived from loop to clean 3.3V for signal conditioning ASIC. Use Value: 2.5µA IQ ensures loop compliance down to 4mA; 35ns on-time supports efficient operation even at lowest loop voltage. |
Use Scenario: Powering ARM Cortex-M7 MCU, Wi-Fi SoC, and RS-485 transceivers in factory-floor wireless gateway with 24V DC input. IC Role / Device Role / Timing Role: Compact, high-efficiency primary 3.3V regulator enabling fanless operation in thermally constrained enclosures. Use Value: DFN-10 package and internal compensation reduce PCB area by 30% vs discrete solutions; 2.2MHz capability shrinks filter size. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT8618IDDB#TRPBF | Same architecture and pinout, but rated for –40°C to 125°C junction (vs 150°C for J-grade). | Not qualified for under-hood automotive use; suitable for industrial control cabinets with lower ambient limits. | Select LT8618IDDB#TRPBF only if thermal margin allows ≤125°C operation and cost sensitivity outweighs extended temperature need. |
| LT8618EDDB#TRPBF | Identical electrical specs and package, but specified for –40°C to 125°C and commercial-grade reliability screening. | Excludes AEC-Q100 testing; intended for non-automotive, non-critical industrial applications. | Choose LT8618EDDB#TRPBF for cost-sensitive consumer or prototyping use where 150°C operation is unnecessary. |
Compared with LT8618IDDB#TRPBF and LT8618EDDB#TRPBF, the LT8618JDDB#TRPBF provides guaranteed 150°C operation and AEC-Q100 qualification-essential for automotive body electronics and high-temperature industrial sensors where thermal derating cannot be tolerated.
Availability
LT8618JDDB#TRPBF is available at Aetrix Electronics and suitable for automotive body controllers, industrial sensor nodes, 4–20mA loop transmitters, and IIoT edge gateways requiring stable component supply across extended temperature ranges.
Supply support for LT8618JDDB#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 industrial, automotive, communications, and healthcare markets.
The LT8618 family delivers compact, high-efficiency synchronous buck regulation for space- and power-constrained applications including automotive housekeeping, industrial sensors, and loop-powered instrumentation.
FAQ
What is the maximum continuous input voltage rating for the LT8618JDDB#TRPBF?
The LT8618JDDB#TRPBF supports 60V continuous input voltage, with 65V absolute maximum rating for transients only. This allows direct connection to 48V industrial buses and automotive 24V/12V systems with load dump protection, eliminating need for pre-regulators in most applications.
Does the LT8618JDDB#TRPBF require external feedback resistors to set its output voltage?
No. The LT8618JDDB#TRPBF is the fixed 3.3V version of the LT8618 family and integrates the feedback divider internally. The OUT pin serves as both output and regulation node, removing external resistor requirements and improving accuracy and long-term stability compared to adjustable variants.
How does the LT8618JDDB#TRPBF achieve 2.5µA quiescent current?
The LT8618JDDB#TRPBF achieves 2.5µA IQ in Burst Mode by completely disabling non-essential circuitry-including oscillator, error amplifier, and gate drivers-between switching bursts. This ultralow IQ is measured at 48VIN → 3.3VOUT and enables multi-year operation in battery-backed sensor nodes.
Is the LT8618JDDB#TRPBF pin-compatible with other variants in the LT8618 family?
Yes. The LT8618JDDB#TRPBF shares identical 10-lead DFN-3×2mm pinout and footprint with LT8618EDDB#TRPBF, LT8618IDDB#TRPBF, and all -3.3 suffix variants. This enables drop-in replacement across temperature grades without PCB redesign, provided thermal and reliability requirements align.
What thermal performance can be expected from the LT8618JDDB#TRPBF in a standard 2-layer PCB layout?
In a standard 2-layer PCB with 1in² copper pour connected to the exposed GND pad, the LT8618JDDB#TRPBF achieves θJA ≈ 76°C/W. At 100mA output and 24VIN→3.3VOUT, junction temperature rise is ~58°C above ambient-well within its 150°C max rating and supporting reliable operation up to +92°C ambient.
LT8618JDDB#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):
- 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#TRPBF FAQ
1.How can I place an order for LT8618JDDB#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8618JDDB#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 LT8618JDDB#TRPBF reliable?
The price and inventory of LT8618JDDB#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8618JDDB#TRPBF is usually 5 days.
3.What payment methods are accepted for LT8618JDDB#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8618JDDB#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8618JDDB#TRPBF?
LT8618JDDB#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8618JDDB#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 LT8618JDDB#TRPBF?
For technical support, including LT8618JDDB#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8618JDDB#TRPBF requirements.
6.How does Aetrix verify that LT8618JDDB#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT8618JDDB#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 LT8618JDDB#TRPBF meets industry standards.
7.What is the process for return or replacement of LT8618JDDB#TRPBF?
All LT8618JDDB#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8618JDDB#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 LT8618JDDB#TRPBF part is unused and in its original packaging.
Return procedure for LT8618JDDB#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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