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Analog Devices Inc. LT8618EDDB-3.3#TRMPBF
- Part No.:
- LT8618EDDB-3.3#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
LT8618EDDB-3.3#TRMPBF.pdf
- Description:
- IC REG BUCK 3.3V 100MA 10DFN
- Quantity:
- Payment:
- Shipping:
Inventory:239
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Product details
Overview
LT8618EDDB-3.3#TRMPBF from Analog Devices is a monolithic synchronous step-down DC/DC converter delivering 100mA at fixed 3.3V output, operating from 3.4V to 60V input (65V transient), with 2.5µA quiescent current in Burst Mode and 35ns minimum on-time. It integrates top/bottom NMOS switches, internal compensation, soft-start, and power-good flag-designed for industrial sensors and 4–20mA loop supplies.
For engineers reviewing the LT8618EDDB-3.3#TRMPBF datasheet, LT8618EDDB-3.3#TRMPBF pinout, LT8618EDDB-3.3#TRMPBF application, or LT8618EDDB-3.3#TRMPBF equivalent, key selection criteria include input voltage range, light-load efficiency, PG flag behavior, thermal grade (–40°C to 125°C), and DFN-10 package compatibility with side-wettable solder joints.
Technical Context
The LT8618EDDB-3.3#TRMPBF uses constant-frequency current-mode control with internal 0.778V reference and fixed 3.3V output via internal feedback divider. Its 35ns minimum on-time enables high VIN/VOUT ratios (e.g., 48V→3.3V) without pulse-skipping instability. Burst Mode operation reduces IQ to 2.5µA while maintaining regulation, and the PG flag asserts when VOUT is within ±7.5% of 3.3V and no fault exists.
Thermal protection triggers at 150°C junction temperature. The device supports external RT resistor programming (200kHz–2.2MHz), but LT8618-3.3 variants-including this part-do not support SYNC/MODE pin functionality or internal BST/INTVCC capacitors (unlike LT8618C). EN/UV threshold is 1.05V rising with 50mV hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3V ±3% (3.2V–3.4V) at 100µA–100mA load, enabling direct replacement of LDOs in noise-sensitive analog rails. |
| Input Voltage Range | 3.4V to 60V continuous (65V transient), supporting wide-input industrial and automotive housekeeping applications. |
| Quiescent Current | 2.5µA in Burst Mode at 48VIN→3.3VOUT, critical for battery-backed or energy-harvesting systems. |
| Switching Frequency | Programmable 200kHz–2.2MHz via RT resistor; typical 400kHz operation balances EMI and efficiency for 12VIN→3.3VOUT. |
| Minimum On-Time | 35ns, allowing stable 48V→3.3V conversion at 2MHz without duty-cycle limitation. |
| Power-Good Flag | Open-drain PG asserts high when VOUT is within ±7.5% of 3.3V and VIN > 3.4V, independent of EN/UV state-enabling reliable system sequencing. |
| Operating Temperature | –40°C to +125°C junction, qualified per AEC-Q100 for automotive housekeeping use cases. |
Pinout & Package
LT8618EDDB-3.3#TRMPBF uses a 10-lead 3mm × 2mm plastic DFN package with exposed thermal pad (Pin 11 = GND), rated for –40°C to +125°C operation. Side-wettable leads enable automated optical inspection (AOI) of solder joints.
| Pin/Terminal | 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 | Tie to VOUT (3.3V) to reduce VIN current draw; bypass with 1µF ceramic if sourced externally. |
| INTVCC | Internal 3.4V regulator bypass | Decouple with ≥1µF low-ESR ceramic to GND; supplies internal logic/drivers-no external loading permitted. |
| RT | Frequency setting resistor | Grounded resistor sets fSW: 221kΩ → 200kHz, 18.2kΩ → 2MHz (in Forced Continuous Mode). |
| OUT | Fixed 3.3V output feedback | Internal reference node; connect output capacitor directly here-no external resistors required. |
| TR/SS | Soft-start and tracking | 2µA internal pull-up enables RC-controlled ramp rate; pulled low during fault/shutdown. |
| PG | Power-good open-drain | Active-high when VOUT stable; requires external pull-up (e.g., 10kΩ to 3.3V) for MCU reset or sequencing. |
| EN/UV | Enable and undervoltage lockout | Hysteretic 1.05V/1.00V threshold; tie to VIN for always-on operation or use resistor divider for custom UVLO. |
| VIN | Main input supply | Bypass locally with ≥1µF ceramic; positive terminal must be placed adjacent to this pin for low-impedance path. |
Key Features
| Feature | Design Value |
|---|---|
| Ultralow IQ Burst Mode | 2.5µA quiescent current at 48VIN→3.3VOUT maintains regulation without wake-up latency-ideal for intermittent-sensing nodes. |
| Integrated Power Switches | Top/bottom NMOS with 3Ω/1.3Ω RDS(on) eliminate external MOSFETs and gate drivers, reducing BOM count and layout complexity. |
| Fixed 3.3V Output | No external feedback resistors needed-reduces component count, improves accuracy (±3%), and eliminates resistor tolerance drift effects. |
| Robust Thermal Protection | Thermal shutdown activates at 150°C junction temperature with automatic recovery, preventing permanent damage under overload or poor heatsinking. |
| Side-Wettable DFN Package | 10-lead 3mm×2mm DFN with solderable side walls enables AOI-compatible assembly and improved thermal conduction vs. standard DFN. |
Applications
| Industrial Sensors | 4–20mA Current Loops |
|---|---|
Use Scenario: Powering MEMS pressure sensors in harsh factory environments with wide input voltage variation (12–48V DC). IC Role / Device Role / Timing Role: Primary 3.3V rail generator with ultralow IQ to extend battery life in wireless sensor nodes. Use Value: 2.5µA Burst Mode IQ enables multi-year operation on coin-cell batteries; 60V input withstands motor drive transients. | Use Scenario: Supplying precision op-amps and ADCs in loop-powered field transmitters. IC Role / Device Role / Timing Role: Stable 3.3V bias rail for signal conditioning circuitry sharing the same 4–20mA loop power. Use Value: ±3% output accuracy and <10mVP-P ripple ensure sub-LSB ADC performance; PG flag validates rail before data acquisition. |
| Flow Meters | Automotive Housekeeping Supplies |
Use Scenario: Providing regulated 3.3V to ultrasonic time-of-flight measurement ICs in water/gas flow meters. IC Role / Device Role / Timing Role: High-efficiency buck converter powering microcontroller and transducer driver stages. Use Value: 35ns min-on-time supports 24V→3.3V conversion at 2MHz, minimizing inductor size and EMI in compact meter housings. | Use Scenario: Generating 3.3V for infotainment microcontrollers and CAN transceivers in vehicle body control modules. IC Role / Device Role / Timing Role: AEC-Q100 qualified housekeeping supply replacing discrete LDOs in 12V/24V automotive systems. Use Value: –40°C to +125°C operation and 65V transient rating meet ISO 7637-2 pulse requirements; side-wettable DFN ensures solder joint reliability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT8618IDDB-3.3#TRMPBF | Same electrical specs and pinout; rated for –40°C to +125°C (I-grade), identical thermal performance and efficiency curves. | No functional difference; intended for same industrial and automotive applications requiring full temp-range validation. | Select when full production qualification across –40°C to +125°C is required-guaranteed over full range vs. E-grade design assurance. |
| LT8618JDDB-3.3#TRMPBF | Same electrical specs and pinout; rated for –40°C to +150°C junction, higher thermal shutdown threshold (150°C vs. 125°C for E/I grades). | Suitable for under-hood automotive or high-ambient industrial enclosures where junction temperatures exceed 125°C. | Choose for extended temperature environments-provides margin for derated operation in thermally constrained layouts. |
Compared with LT8618EDDB-3.3#TRMPBF, the I-grade variant offers guaranteed full-range performance, while the J-grade extends maximum junction temperature to 150°C-both retain identical efficiency, quiescent current, and pin compatibility, enabling drop-in upgrades based on thermal or qualification requirements.
Availability
LT8618EDDB-3.3#TRMPBF is available at Aetrix Electronics and suitable for industrial sensors, 4–20mA current loops, flow meters, and automotive housekeeping supplies requiring stable component supply, long-term lifecycle support, and AEC-Q100-compliant sourcing.
Supply support for LT8618EDDB-3.3#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 is designed for high-efficiency, wide-input synchronous buck conversion in space-constrained and thermally demanding applications-emphasizing ultralow IQ, fast transient response, and robust operation across automotive and industrial temperature ranges.
FAQ
What is the output voltage tolerance of the LT8618EDDB-3.3#TRMPBF?
The LT8618EDDB-3.3#TRMPBF delivers a fixed 3.3V output with a tolerance of ±3% (3.2V to 3.4V) across load (100µA–100mA), input (3.4V–60V), and temperature (–40°C to +125°C). This specification is verified per the manufacturer's Electrical Characteristics table and applies to the E-grade version specifically.
Does the LT8618EDDB-3.3#TRMPBF support external frequency synchronization?
No, the LT8618EDDB-3.3#TRMPBF does not support external synchronization. Only the LT8618C variant includes a SYNC/MODE pin; the LT8618EDDB-3.3#TRMPBF uses an RT resistor for frequency setting and operates in either Burst Mode or Forced Continuous Mode without programmable sync capability.
What is the minimum input voltage required for the LT8618EDDB-3.3#TRMPBF to regulate 3.3V?
The LT8618EDDB-3.3#TRMPBF requires a minimum input voltage of 3.4V for continuous operation, as specified in the Absolute Maximum Ratings and Electrical Characteristics tables. Below this, regulation cannot be maintained-even though the EN/UV pin threshold is 1.05V, the internal power stage requires sufficient headroom for the 3.3V output.
How is thermal management handled in the LT8618EDDB-3.3#TRMPBF?
The LT8618EDDB-3.3#TRMPBF incorporates thermal shutdown that activates at 150°C junction temperature, with automatic recovery upon cooling. Its 10-lead DFN package features an exposed thermal pad (Pin 11 = GND) that must be soldered to a PCB copper pour to achieve θJA = 76°C/W and maintain safe operating temperatures under full 100mA load.
Can the LT8618EDDB-3.3#TRMPBF be used in AEC-Q100 automotive applications?
Yes-the LT8618EDDB-3.3#TRMPBF is AEC-Q100 qualified for automotive applications, as confirmed in the "AUTOMOTIVE PRODUCTS" section of the datasheet. It meets Grade 1 (–40°C to +125°C) requirements and is designated for automotive housekeeping supplies, including infotainment and body control modules.
LT8618EDDB-3.3#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:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 3.4V
- Voltage - Input (Max):
- 60V
- Voltage - Output (Min/Fixed):
- 3.3V
- Voltage - Output (Max):
- -
- 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)
LT8618EDDB-3.3#TRMPBF FAQ
1.How can I place an order for LT8618EDDB-3.3#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8618EDDB-3.3#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 LT8618EDDB-3.3#TRMPBF reliable?
The price and inventory of LT8618EDDB-3.3#TRMPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8618EDDB-3.3#TRMPBF is usually 5 days.
3.What payment methods are accepted for LT8618EDDB-3.3#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8618EDDB-3.3#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8618EDDB-3.3#TRMPBF?
LT8618EDDB-3.3#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8618EDDB-3.3#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 LT8618EDDB-3.3#TRMPBF?
For technical support, including LT8618EDDB-3.3#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8618EDDB-3.3#TRMPBF requirements.
6.How does Aetrix verify that LT8618EDDB-3.3#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LT8618EDDB-3.3#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 LT8618EDDB-3.3#TRMPBF meets industry standards.
7.What is the process for return or replacement of LT8618EDDB-3.3#TRMPBF?
All LT8618EDDB-3.3#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8618EDDB-3.3#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 LT8618EDDB-3.3#TRMPBF part is unused and in its original packaging.
Return procedure for LT8618EDDB-3.3#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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