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Analog Devices Inc. LT8618EDDB#WTRPBF
- Part No.:
- LT8618EDDB#WTRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
LT8618EDDB#WTRPBF.pdf
- Description:
- IC REG BUCK ADJ 100MA 10DFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,839
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Product details
Overview
LT8618EDDB#WTRPBF 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 fixed-frequency operation up to 2.2MHz. It targets automotive housekeeping supplies and industrial IoT sensors requiring ultra-low IQ and wide input range.
For engineers reviewing the LT8618EDDB#WTRPBF datasheet, LT8618EDDB#WTRPBF pinout, LT8618EDDB#WTRPBF application, or LT8618EDDB#WTRPBF equivalent, this page delivers verified electrical specs, package mapping, thermal performance data, and real-world use-case implementation guidance for 3.3V bias rail design under 60V continuous input.
Technical Context
The LT8618EDDB#WTRPBF implements constant-frequency current-mode control with internal top/bottom NMOS switches, 0.778V feedback reference, and integrated soft-start/tracking via TR/SS pin. It supports ultralow-noise Burst Mode operation below 10mA load while maintaining ±7.5% PG flag accuracy.
Its 10-lead DFN (3mm × 2mm) package features exposed GND pad for thermal management, VIN UVLO at 2.9V (rising), and EN/UV threshold of 1.05V with 50mV hysteresis - enabling robust start-up in automotive cold-crank conditions.
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 buses without pre-regulation. |
| Output Voltage | Adjustable via FB pin (0.778V reference); LT8618EDDB#WTRPBF requires external resistor divider for 3.3V setting. |
| Quiescent Current | 2.5µA in Burst Mode at 48VIN→3.3VOUT; sustains >10-year battery life in always-on sensor nodes. |
| Switching Frequency | 200kHz to 2.2MHz (RT-programmable); allows compact magnetics and EMI filtering in space-constrained layouts. |
| Minimum On-Time | 35ns (typical); supports high step-down ratios (e.g., 48V→3.3V) at 2MHz without pulse-skipping instability. |
| PG Flag Accuracy | ±7.5% output regulation window; provides reliable power-good signaling for microcontroller reset sequencing. |
| Operating Temperature | –40°C to 125°C junction; qualified for extended-temperature industrial and automotive under-hood applications. |
Pinout & Package
LT8618EDDB#WTRPBF uses a 10-lead (3mm × 2mm) plastic DFN package with exposed thermal pad (Pin 11 = GND). The package is side-wettable for automated optical inspection (AOI) and supports reflow-compatible soldering per JEDEC J-STD-020.
| 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 stable 35ns on-time operation. |
| 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 (≥3.2V) to reduce VIN current draw; bypass with 1µF ceramic if sourced externally. |
| INTVCC | Internal 3.4V regulator bypass | Decouple with ≥1µF low-ESR ceramic; powers gate drivers and control logic; not for external loading. |
| RT | Frequency programming | Resistor to GND sets fSW (200kHz–2.2MHz); 18.2kΩ yields ~2MHz in forced continuous mode. |
| FB | Feedback input | Regulated to 0.778V; connects to resistor divider tap for adjustable output; ±20nA input current minimizes divider error. |
| TR/SS | Soft-start & tracking | 2µA internal pull-up enables capacitor-programmed slew rate; pulled low during fault for safe shutdown. |
| PG | Power-good open-drain | Active-low flag valid when VIN > 3.4V; indicates VOUT within ±7.5% and no thermal/fault condition. |
| EN/UV | Enable / undervoltage lockout | Hysteretic threshold (1.05V rising / 1.00V falling); resistor divider from VIN enables custom UVLO point. |
| VIN | Main input supply | Supplies internal circuitry and top switch; requires local high-frequency bypass (e.g., 1µF X7R + 10µF tantalum). |
Key Features
| Feature | Design Value |
|---|---|
| Ultralow Quiescent Current | 2.5µA in Burst Mode enables multi-year operation from coin-cell or energy-harvesting sources in remote sensors. |
| Fast Minimum On-Time | 35ns supports high-frequency, high-ratio conversion (e.g., 48V→3.3V @ 2MHz) without duty-cycle limitation. |
| Integrated Soft-Start & Tracking | TR/SS pin allows controlled ramp-up and coordinated sequencing with other rails using external voltage source. |
| Robust Protection Suite | Includes thermal shutdown, PG flag with ±7.5% accuracy, and VIN UVLO with 50mV hysteresis for cold-crank immunity. |
| Automotive-Qualified Grade | E-grade (–40°C to 125°C) meets AEC-Q100 requirements for non-safety-critical automotive housekeeping supplies. |
Applications
| Industrial Flow Meter | Automotive Body Control Module |
|---|---|
|
Use Scenario: Powering 4–20mA transmitter electronics in explosion-proof enclosures with 24V loop supply. IC Role / Device Role / Timing Role: Primary 3.3V bias rail regulator converting 24V loop voltage with <2.5µA standby draw to preserve loop compliance. Use Value: Enables full 4–20mA range operation while maintaining <100mV dropout at 100mA load and meeting IEC 61000-4-5 surge immunity. |
Use Scenario: Supplying MCU, CAN transceiver, and LED drivers in door module with 12V battery input subject to load dump. IC Role / Device Role / Timing Role: Secondary housekeeping regulator providing clean 3.3V for digital logic, immune to 60V transients per ISO 7637-2. Use Value: Delivers >90% efficiency at 30mA (12V→3.3V) and withstands –40°C to 125°C ambient without derating. |
| IIoT Wireless Sensor Node | Programmable Logic Controller I/O Module |
|
Use Scenario: Battery-powered vibration sensor with LoRaWAN radio, requiring multi-year runtime and fast wake-up response. IC Role / Device Role / Timing Role: Always-on 3.3V supply enabling sub-µA sleep current and <10µs startup time after EN assertion. Use Value: Burst Mode reduces IQ to 2.5µA; 35ns min-on-time ensures stable 2MHz switching during brief transmit bursts. |
Use Scenario: Isolated analog input channel powered from 24V DC field bus, needing precise 3.3V reference for ADC. IC Role / Device Role / Timing Role: Local regulation stage decoupling sensitive analog circuitry from noisy 24V bus ripple and transients. Use Value: Output ripple <10mVP-P and line regulation ±0.06%/V ensure <12-bit ADC accuracy without additional LDO post-regulation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT8618EDDB-3.3#WTRPBF | Fixed 3.3V output; internal feedback resistors eliminate external divider; same package and temperature grade. | Reduces BOM count and layout area where 3.3V is fixed; lacks adjustability for future voltage scaling. | Select when system requires guaranteed 3.3V without resistor tolerance drift; ideal for high-volume cost-sensitive designs. |
| LT8618CDDC#TRPBF | LQFN (2mm × 2mm); includes SYNC/MODE pin for forced continuous, burst, spread-spectrum, or external sync modes; no BST/INTVCC pins. | Enables EMI reduction via spread-spectrum or synchronization in noise-sensitive systems; smaller footprint but different pinout. | Choose for space-constrained, low-EMI applications where programmable mode control outweighs pin compatibility needs. |
Compared with LT8618EDDB#WTRPBF, the LT8618EDDB-3.3#WTRPBF simplifies design by removing external feedback components while retaining identical thermal and electrical performance, whereas the LT8618CDDC#TRPBF trades pin compatibility for advanced EMI control and miniaturization - both require PCB redesign.
Availability
LT8618EDDB#WTRPBF is available at Aetrix Electronics and suitable for industrial flow meters, automotive body control modules, IIoT wireless sensor nodes, and PLC I/O modules requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LT8618EDDB#WTRPBF 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 such as automotive housekeeping, industrial sensors, and portable instrumentation - emphasizing ultralow IQ, wide VIN, and robust protection.
FAQ
What is the maximum continuous input voltage rating for the LT8618EDDB#WTRPBF?
The LT8618EDDB#WTRPBF supports 60V continuous input voltage operation, with absolute maximum rating of 65V for transient conditions only. This enables direct interface with 48V industrial buses and automotive 24V/12V systems under load-dump stress, provided external TVS clamping is used for sustained overvoltage events beyond 60V.
Does the LT8618EDDB#WTRPBF include internal compensation?
Yes, the LT8618EDDB#WTRPBF features internal compensation, eliminating the need for external compensation components. Its current-mode architecture with integrated slope compensation ensures stable operation across the full 200kHz–2.2MHz frequency range and load conditions from zero to 100mA without requiring loop compensation network design.
How does the EN/UV pin function on the LT8618EDDB#WTRPBF?
The EN/UV pin on the LT8618EDDB#WTRPBF provides enable control and undervoltage lockout with 1.05V rising threshold and 1.00V falling threshold (50mV hysteresis). When tied to VIN, it enables operation; when pulled below 1.00V, it shuts down the regulator. An external resistor divider from VIN allows custom UVLO points for cold-crank detection in automotive applications.
What is the purpose of the TR/SS pin on the LT8618EDDB#WTRPBF?
The TR/SS pin on the LT8618EDDB#WTRPBF serves dual functions: soft-start control and output voltage tracking. An internal 2µA pull-up current allows a capacitor to program output ramp rate during startup, while applying an external voltage below 0.778V forces the regulator to track that voltage - enabling precise power sequencing with other rails in complex systems.
Is the LT8618EDDB#WTRPBF pin-compatible with other variants in the LT8618 family?
No, the LT8618EDDB#WTRPBF is not pin-compatible with LT8618C or LT8618-3.3 variants. It uses the 10-lead DFN package with BST/SW/BIAS/INTVCC/RT/FB/TR/SS/PG/EN/UV/VIN pinout, whereas LT8618C uses a 12-lead LQFN with SYNC/MODE and HYST pins, and LT8618-3.3 replaces FB with OUT. PCB layout must be specific to each variant.
LT8618EDDB#WTRPBF 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:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-DFN (3x2)
LT8618EDDB#WTRPBF FAQ
1.How can I place an order for LT8618EDDB#WTRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8618EDDB#WTRPBF 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#WTRPBF reliable?
The price and inventory of LT8618EDDB#WTRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8618EDDB#WTRPBF is usually 5 days.
3.What payment methods are accepted for LT8618EDDB#WTRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8618EDDB#WTRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8618EDDB#WTRPBF?
LT8618EDDB#WTRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8618EDDB#WTRPBF 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#WTRPBF?
For technical support, including LT8618EDDB#WTRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8618EDDB#WTRPBF requirements.
6.How does Aetrix verify that LT8618EDDB#WTRPBF is sourced from the original manufacturer or authorized distributors?
All LT8618EDDB#WTRPBF 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#WTRPBF meets industry standards.
7.What is the process for return or replacement of LT8618EDDB#WTRPBF?
All LT8618EDDB#WTRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8618EDDB#WTRPBF, 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#WTRPBF part is unused and in its original packaging.
Return procedure for LT8618EDDB#WTRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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