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Analog Devices Inc. LT8618EDDB#TRMPBF
- Part No.:
- LT8618EDDB#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
LT8618EDDB#TRMPBF.pdf
- Description:
- IC REG BUCK ADJ 100MA 10DFN
- Quantity:
- Payment:
- Shipping:
Inventory:104
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Product details
Overview
LT8618EDDB#TRMPBF from Analog Devices is a high-efficiency, 65V-input synchronous step-down DC/DC regulator delivering up to 100mA at adjustable output voltage with 0.778V feedback reference, 35ns minimum on-time, and 2.5µA quiescent current in Burst Mode. It operates continuously from 3.4V to 60V input, supports 200kHz–2.2MHz switching frequency via RT resistor, and targets low-power industrial sensors and 4–20mA loop supplies.
For engineers reviewing the LT8618EDDB#TRMPBF datasheet, LT8618EDDB#TRMPBF pinout, LT8618EDDB#TRMPBF application, or LT8618EDDB#TRMPBF equivalent, key selection criteria include input voltage range (3.4–60V), ultralow IQ regulation, fixed-frequency current-mode control, thermal shutdown protection, and compatibility with compact 10-lead DFN packaging for space-constrained embedded systems.
Technical Context
The LT8618EDDB#TRMPBF implements constant-frequency peak-current-mode control with internal slope compensation and an integrated 0.778V reference. Its 35ns minimum on-time enables high VIN/VOUT ratios (e.g., 48V→3.3V) without pulse-skipping artifacts, while the 200kHz–2.2MHz programmable oscillator allows EMI optimization across diverse PCB layouts.
Burst Mode operation reduces quiescent current to 2.5µA at light loads by disabling gate drivers and control circuitry between switching bursts, whereas forced continuous mode maintains fixed frequency for predictable noise spectra-critical in high-resolution data acquisition systems where interference must be avoided during sampling windows.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.4V to 60V continuous (65V transient); supports wide industrial and automotive supply rails without external pre-regulation. |
| Output Current | Up to 100mA; sufficient for powering microcontrollers, analog front-ends, and precision sensors in remote IoT nodes. |
| Quiescent Current | 2.5µA in Burst Mode at 48VIN→3.3VOUT; enables multi-year battery life in always-on sensor applications. |
| Switching Frequency | 200kHz to 2.2MHz (RT-programmable); allows trade-off between inductor size, efficiency, and EMI compliance. |
| Feedback Reference | 0.778V ±1.6% over temperature; enables precise output regulation with external resistor divider for custom voltages. |
| Min On-Time | 35ns typical; permits high step-down ratios (e.g., 48V→3.3V at 2MHz) without duty-cycle limitation. |
| Package | 10-Lead 3mm × 2mm Plastic DFN with exposed pad; provides low θJA = 76°C/W for thermally constrained designs. |
Pinout & Package
LT8618EDDB#TRMPBF uses a 10-lead (3mm × 2mm) plastic DFN package with exposed thermal pad (Pin 11 = GND). The package requires soldering of the exposed pad to PCB ground plane for thermal performance and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BST | Bootstrap capacitor connection | Drives top NMOS gate above VIN; requires 47nF ceramic cap placed adjacent to IC for reliable high-side switching. |
| SW | Switch node | Connects directly to inductor; high di/dt node requiring minimal PCB trace 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 | Must be decoupled with ≥1µF ceramic cap; powers gate drivers and control logic; sourced from BIAS or VIN. |
| RT | Frequency setting resistor | Resistor to GND sets fSW from 200kHz to 2.2MHz; determines inductor size, ripple, and EMI profile. |
| FB | Feedback input | Regulated to 0.778V; connects to resistor divider tap for adjustable output voltage configuration. |
| TR/SS | Soft-start and tracking | 2µA internal pull-up enables capacitor-based soft-start ramp; also supports output voltage tracking in multi-rail systems. |
| PG | Power good flag | Open-drain output asserts high when VOUT is within ±7.5% of target and no fault exists; valid above 3.4VIN. |
| EN/UV | Enable and UVLO input | Hysteretic threshold (1.05V rising / 1.00V falling); supports programmable input undervoltage lockout via resistor divider. |
| VIN | Main power input | Supplies internal circuitry and top switch; requires local high-frequency bypass capacitor near pin. |
Key Features
| Feature | Design Value |
|---|---|
| Ultralow IQ Burst Mode | 2.5µA quiescent current at 48VIN→3.3VOUT enables decade-scale battery operation in wireless sensors. |
| 35ns Minimum On-Time | Enables 2MHz operation even at 48V→3.3V (6.5% duty cycle), avoiding frequency foldback and maintaining regulation stability. |
| Programmable Switching Frequency | 200kHz–2.2MHz via single RT resistor; allows layout-driven EMI mitigation and optimal inductor selection. |
| Integrated Power Switches | Monolithic 3Ω top / 1.3Ω bottom NMOS switches eliminate external FETs and gate drivers, reducing BOM count and footprint. |
| Accurate Enable Threshold | 1.05V rising EN/UV threshold with 50mV hysteresis ensures clean startup and robust immunity to supply rail noise. |
| Thermal Shutdown Protection | Activates above 150°C junction temperature; prevents damage during overload or poor heatsinking conditions. |
Applications
| Industrial Sensor Node | 4–20mA Current Loop Transmitter |
|---|---|
|
Use Scenario: Remote temperature/humidity sensor powered by 24V loop supply with isolated ADC and MCU. IC Role / Device Role / Timing Role: Primary 3.3V housekeeping regulator converting 24V loop voltage to stable MCU and sensor supply. Use Value: 2.5µA IQ extends battery backup life; 35ns min on-time ensures regulation at full 24V input; DFN package fits tight enclosure. |
Use Scenario: Field transmitter conditioning analog sensor signal and driving 4–20mA output stage from 24V industrial bus. IC Role / Device Role / Timing Role: Local 3.3V supply for op-amps, DAC, and microcontroller core logic. Use Value: High 90%+ efficiency at 30mA load minimizes self-heating in sealed housing; PG flag validates supply before enabling loop drive. |
| Automotive Body Control Module | IoT Edge Node with Low-Power MCU |
|
Use Scenario: Non-safety-critical lighting or HVAC control module operating from 12V vehicle battery with cold-crank tolerance. IC Role / Device Role / Timing Role: Secondary regulator supplying 3.3V to CAN transceiver and microcontroller after main buck converter. Use Value: 60V continuous input withstands load-dump transients; -40°C to 125°C rating meets AEC-Q100 Grade E requirements. |
Use Scenario: Battery-powered environmental monitor using ARM Cortex-M0+ MCU and BLE radio, sleeping >99% of time. IC Role / Device Role / Timing Role: Always-on power source for RTC, wake-up logic, and brown-out detection circuitry. Use Value: 2.5µA IQ dominates system sleep current; programmable fSW allows optimizing for lowest total energy per wakeup cycle. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT8618IDDB#TRMPBF | Same silicon, extended temperature grade (–40°C to 125°C vs. –40°C to 125°C - identical spec; E-grade is commercial, I-grade is industrial with tighter parametric testing). | No functional difference; intended for industrial environments requiring enhanced long-term reliability validation. | Select LT8618IDDB#TRMPBF for deployments requiring extended lifetime assurance under thermal cycling stress. |
| LT8618JDDB#TRMPBF | Same silicon, higher junction temperature rating (–40°C to 150°C) and guaranteed performance to 150°C; otherwise identical electrical specs. | Suitable for under-hood automotive or high-ambient industrial enclosures where ambient exceeds 85°C. | Choose LT8618JDDB#TRMPBF when board-level ambient exceeds 85°C and thermal derating margins are insufficient with E-grade. |
Compared with LT8618EDDB#TRMPBF, the I-grade offers tighter production test limits for long-term stability in harsh environments, while the J-grade extends operational ceiling to 150°C junction-both retain identical pinout, features, and electrical behavior but differ in qualification scope and thermal margin.
Availability
LT8618EDDB#TRMPBF is available at Aetrix Electronics and suitable for industrial sensor nodes, 4–20mA current loop transmitters, and automotive body control modules requiring stable component supply with guaranteed long-term sourcing.
Supply support for LT8618EDDB#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 with precision power, sensing, and conversion solutions.
The LT8618 family was designed specifically for ultra-low-power, high-input-voltage DC/DC conversion in space- and energy-constrained industrial and automotive subsystems-emphasizing burst-mode efficiency, fast transient response, and robust thermal performance.
FAQ
What is the maximum continuous input voltage rating for the LT8618EDDB#TRMPBF?
The LT8618EDDB#TRMPBF supports continuous operation up to 60V input; transients up to 65V are allowed for short durations. This rating enables direct connection to 48V industrial buses and 24V automotive systems without external clamping, provided design margins account for worst-case ripple and overshoot.
Does the LT8618EDDB#TRMPBF support adjustable output voltage?
Yes, the LT8618EDDB#TRMPBF uses an adjustable feedback architecture with a 0.778V reference voltage at the FB pin. By connecting a resistor divider between VOUT, FB, and GND, users can set any output voltage ≥0.778V-enabling configurations such as 1.8V for low-power MCUs or 5V for interface peripherals.
How does the LT8618EDDB#TRMPBF achieve 2.5µA quiescent current?
The LT8618EDDB#TRMPBF achieves 2.5µA IQ in Burst Mode by completely disabling gate drivers, oscillator, and error amplifier between switching bursts-only essential bias circuitry remains active. This architecture eliminates switching losses at light loads while maintaining regulation accuracy and fast wake-up capability.
Can the LT8618EDDB#TRMPBF be synchronized to an external clock?
No-the LT8618EDDB#TRMPBF does not include a SYNC pin. Synchronization capability is exclusive to the LT8618C variant (e.g., LT8618CAV#TRMPBF), which adds a dedicated SYNC/MODE pin for external clock alignment or spread-spectrum modulation to reduce EMI peaks.
What thermal considerations apply to the LT8618EDDB#TRMPBF in a 10-lead DFN package?
The LT8618EDDB#TRMPBF has θJA = 76°C/W and requires soldering of its exposed thermal pad (Pin 11) to a PCB ground plane with ≥4 thermal vias. At 100mA output and 48VIN→3.3VOUT, junction temperature rise is ~35°C above ambient-ensuring safe operation below 125°C max rating with minimal copper area.
LT8618EDDB#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)
LT8618EDDB#TRMPBF FAQ
1.How can I place an order for LT8618EDDB#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8618EDDB#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#TRMPBF reliable?
The price and inventory of LT8618EDDB#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#TRMPBF is usually 5 days.
3.What payment methods are accepted for LT8618EDDB#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8618EDDB#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8618EDDB#TRMPBF?
LT8618EDDB#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8618EDDB#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#TRMPBF?
For technical support, including LT8618EDDB#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8618EDDB#TRMPBF requirements.
6.How does Aetrix verify that LT8618EDDB#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LT8618EDDB#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#TRMPBF meets industry standards.
7.What is the process for return or replacement of LT8618EDDB#TRMPBF?
All LT8618EDDB#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8618EDDB#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#TRMPBF part is unused and in its original packaging.
Return procedure for LT8618EDDB#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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