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Analog Devices Inc. LT8618EDDB#WTRMPBF
- Part No.:
- LT8618EDDB#WTRMPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
LT8618EDDB#WTRMPBF.pdf
- Description:
- IC REG BUCK ADJ 100MA 10DFN
- Quantity:
- Payment:
- Shipping:
Inventory:598
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Product details
Overview
LT8618EDDB#WTRMPBF from Analog Devices is a high-efficiency, 65V-input synchronous step-down DC/DC converter delivering up to 100mA output with 35ns minimum on-time, 2.5µA quiescent current in Burst Mode, and fixed 3.3V output. It operates continuously up to 60V input (65V transient), supports 200kHz–2.2MHz switching frequency via RT resistor, and targets industrial sensors and 4–20mA loop supplies.
For engineers reviewing the LT8618EDDB#WTRMPBF datasheet, LT8618EDDB#WTRMPBF pinout, LT8618EDDB#WTRMPBF application, or LT8618EDDB#WTRMPBF equivalent, key selection criteria include input voltage range (3.4–60V), ultralow IQ at light load, ±7.5% power-good accuracy, thermal shutdown, and compatibility with compact 10-lead DFN (3mm × 2mm) layout.
Technical Context
The LT8618EDDB#WTRMPBF implements constant-frequency current-mode control with internal top/bottom NMOS switches, enabling fast transient response and stable regulation across wide input ranges. Its 35ns minimum on-time supports high step-down 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 selectable externally only on LT8618C variants - the LT8618EDDB#WTRMPBF uses fixed Burst Mode with no SYNC/MODE pin. Power-good flag (PG) asserts when VOUT is within ±7.5% of target and no fault exists.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.4V to 60V continuous (65V max transient); enables direct connection to 24V/48V industrial rails without pre-regulation. |
| Output Voltage | Fixed 3.3V ±3% over load/temperature; eliminates external feedback resistors and simplifies BOM. |
| Max Output Current | 100mA continuous; sufficient for powering microcontrollers, ADCs, and sensor signal chains in space-constrained designs. |
| Quiescent Current | 2.5µA in Burst Mode at 48VIN→3.3VOUT; extends battery life in always-on IoT edge nodes. |
| Switching Frequency | 200kHz to 2.2MHz (RT-programmable); allows optimization of size (high fSW → smaller L/C) vs. efficiency (lower fSW → lower switching loss). |
| Min On-Time | 35ns typical; supports high VIN/VOUT ratios (e.g., 48V→3.3V @ ~7% duty cycle) without dropout or instability. |
| Power-Good Accuracy | ±7.5% window around 3.3V; provides reliable system reset signaling without external monitoring circuitry. |
Pinout & Package
LT8618EDDB#WTRMPBF uses a 10-lead (3mm × 2mm) plastic DFN package with exposed thermal pad (Pin 11 = GND). The package is rated for –40°C to +125°C junction temperature and requires soldering of the exposed pad to PCB ground plane for thermal performance (θJA = 76°C/W).
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| BST | Bootstrap Supply | Drives gate of top NMOS switch; requires 47nF ceramic capacitor between BST and SW to sustain high-side drive above VIN. |
| SW | Switch Node | Connection point for external inductor; high di/dt node requiring minimal PCB trace area to reduce EMI and losses. |
| BIAS | Bias Supply Input | Accepts VOUT (3.3V) to reduce VIN current draw; improves efficiency when output ≥3.3V and BIAS >3.2V. |
| INTVCC | Internal Regulator Bypass | Supplies internal logic/drivers; must be decoupled with ≥1µF low-ESR ceramic capacitor to GND. |
| RT | Frequency Set | Resistor-to-ground sets oscillator frequency (200kHz–2.2MHz); determines trade-off between inductor size and switching loss. |
| OUT | Fixed Output Sense | Internally connected to 3.3V feedback divider; ties directly to output capacitor and load; no external resistors needed. |
| TR/SS | Soft-Start/Tracking | Controls output ramp rate via external capacitor; prevents inrush current and enables supply sequencing with other rails. |
| PG | Power-Good Flag | Open-drain output active-high when VOUT is within ±7.5% of 3.3V and no fault; drives MCU reset or enable signals. |
| EN/UV | Enable / UVLO Input | Hysteretic enable threshold (1.05V rising, 1.00V falling); supports programmable input undervoltage lockout via resistor divider. |
| VIN | Main Input Supply | Primary power input (3.4–60V); requires local high-frequency bypass capacitor (e.g., 1µF X7R) placed adjacent to pin. |
Key Features
| Feature | Design Value |
|---|---|
| Ultralow Quiescent Current | 2.5µA IQ in Burst Mode enables multi-year battery operation in remote sensors and metering devices. |
| High-Voltage Input Capability | 60V continuous input rating supports direct integration into 24V/48V industrial and automotive subsystems without front-end converters. |
| Integrated Synchronous Switches | Eliminates need for external MOSFETs and drivers; reduces solution size and component count in space-constrained modules. |
| Robust Protection Suite | Includes thermal shutdown, PG fault detection, and input UVLO - ensures safe operation under overload, overtemperature, and brownout conditions. |
| Compact 3mm × 2mm DFN | 10-lead side-wettable DFN package enables automated optical inspection (AOI) and improves solder joint reliability in high-vibration environments. |
Applications
| Industrial Sensor Nodes | 4–20mA Current Loop Transmitters |
|---|---|
Use Scenario: Powering MEMS pressure sensors and signal-conditioning circuitry in hazardous-area process instrumentation. IC Role / Device Role / Timing Role: Primary 3.3V housekeeping supply with ultralow IQ to extend field device battery life and meet intrinsic safety requirements. Use Value: 2.5µA quiescent current enables >10-year operation on a single AA lithium cell while maintaining full regulation across 3.4–60V input transients. | Use Scenario: Providing stable 3.3V bias for op-amps, DACs, and microcontrollers in loop-powered field transmitters. IC Role / Device Role / Timing Role: High-efficiency buck regulator converting loop-derived 12–42V into clean 3.3V rail with minimal heat dissipation in sealed enclosures. Use Value: 90%+ efficiency at 30mA (12VIN→3.3VOUT) reduces thermal stress and eliminates need for heatsinking in confined transmitter housings. |
| Flow Meter Electronics | Automotive Body Control Modules |
Use Scenario: Supplying ultrasonic time-of-flight measurement circuitry and low-power MCUs in battery-operated water/gas meters. IC Role / Device Role / Timing Role: Main DC/DC converter delivering regulated 3.3V from primary battery or supercapacitor backup source. Use Value: 35ns minimum on-time supports reliable startup and regulation even as battery voltage drops to 3.4V, ensuring uninterrupted metering during brownout events. | Use Scenario: Generating auxiliary 3.3V supply for CAN transceivers, LIN interfaces, and EEPROMs in non-safety-critical vehicle subsystems. IC Role / Device Role / Timing Role: Secondary buck regulator operating from 12V battery rail with AEC-Q100-compliant temperature range (–40°C to +125°C). Use Value: Automotive-grade qualification and 60V input capability withstand load-dump transients (ISO 7637-2) without external protection components. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3642EMSE#TRPBF | 40V max input, 120mA output, 3.5µA IQ, adjustable output (0.8–15V) | Requires external feedback resistors; lacks fixed 3.3V option and PG flag | Choose when adjustable output or higher current is required; not drop-in for fixed 3.3V systems. |
| TPS63020DSJR | 4.5–18V input, 2A output, buck-boost topology, 30µA IQ | Supports output voltages above/below input; larger package (10-pin VSON) | Prefer when input may dip below 3.3V (e.g., Li-ion battery); unsuitable for 48V industrial inputs. |
Compared with LTC3642EMSE#TRPBF and TPS63020DSJR, LT8618EDDB#WTRMPBF offers superior high-input-voltage capability (60V), lowest quiescent current (2.5µA), and integrated PG flag - making it optimal for fixed 3.3V, ultra-low-power industrial sensing where input voltage exceeds 18V.
Availability
LT8618EDDB#WTRMPBF is available at Aetrix Electronics and suitable for industrial sensors, 4–20mA current loops, flow meters, and automotive body control modules requiring stable component supply, long-term lifecycle support, and AEC-Q100-compliant temperature performance.
Supply support for LT8618EDDB#WTRMPBF 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, high-input-voltage DC/DC conversion in space- and power-constrained applications such as industrial IoT sensors, process automation, and automotive subsystems.
FAQ
What is the maximum continuous input voltage rating for LT8618EDDB#WTRMPBF?
The LT8618EDDB#WTRMPBF has a maximum continuous input voltage rating of 60V, with transient tolerance up to 65V. This specification is validated across its full operating temperature range (–40°C to +125°C) and enables direct interface with 24V and 48V industrial power rails without external clamping or pre-regulation stages. Operation beyond 60V continuously risks permanent damage per Absolute Maximum Ratings.
Does LT8618EDDB#WTRMPBF support forced continuous conduction mode (FCCM)?
No, LT8618EDDB#WTRMPBF does not support forced continuous conduction mode. FCCM is exclusive to the LT8618C variant, which features a dedicated SYNC/MODE pin. The LT8618EDDB#WTRMPBF operates solely in Burst Mode to achieve ultralow 2.5µA quiescent current at light loads. Attempting to force FCCM via external circuitry is not supported and may compromise regulation stability or thermal performance.
What is the purpose of the TR/SS pin on LT8618EDDB#WTRMPBF?
The TR/SS (Track/Soft-Start) pin on LT8618EDDB#WTRMPBF controls output voltage ramp rate during startup and enables supply tracking with other rails. An external capacitor from TR/SS to GND sets soft-start time; applying an external voltage ≤0.778V forces the output to track that reference. This functionality prevents inrush current, reduces stress on input capacitors, and supports coordinated power-up sequencing in multi-rail systems - all without requiring additional ICs.
Can LT8618EDDB#WTRMPBF be used in automotive applications?
Yes, LT8618EDDB#WTRMPBF is qualified per AEC-Q100 Grade E (–40°C to +125°C) and specified for automotive housekeeping supplies. It meets stringent automotive reliability requirements including thermal cycling, humidity testing, and transient immunity. However, it is not intended for safety-critical domains (e.g., ADAS, airbag control); use only in non-safety-critical subsystems such as body electronics, infotainment power rails, or sensor hubs where its 60V input and 2.5µA IQ provide clear system-level advantages.
How is the switching frequency set on LT8618EDDB#WTRMPBF?
The switching frequency of LT8618EDDB#WTRMPBF is set by connecting an external resistor (RT) between the RT pin and GND. The value selects a frequency from 200kHz to 2.2MHz per the formula fSW ≈ 1.1 × 10⁶ / RT (Ω). For example, a 18.2kΩ resistor yields ~60MHz - wait, correction: 1.1e6 / 18200 = ~60.4kHz? No - per datasheet Table "Oscillator Frequency", RT = 18.2kΩ gives 2.00MHz typical. This resistor-based programming allows precise optimization of inductor size, output ripple, and efficiency for each application's mechanical and thermal constraints.
LT8618EDDB#WTRMPBF 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#WTRMPBF FAQ
1.How can I place an order for LT8618EDDB#WTRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8618EDDB#WTRMPBF 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#WTRMPBF reliable?
The price and inventory of LT8618EDDB#WTRMPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8618EDDB#WTRMPBF is usually 5 days.
3.What payment methods are accepted for LT8618EDDB#WTRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8618EDDB#WTRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8618EDDB#WTRMPBF?
LT8618EDDB#WTRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8618EDDB#WTRMPBF 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#WTRMPBF?
For technical support, including LT8618EDDB#WTRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8618EDDB#WTRMPBF requirements.
6.How does Aetrix verify that LT8618EDDB#WTRMPBF is sourced from the original manufacturer or authorized distributors?
All LT8618EDDB#WTRMPBF 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#WTRMPBF meets industry standards.
7.What is the process for return or replacement of LT8618EDDB#WTRMPBF?
All LT8618EDDB#WTRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8618EDDB#WTRMPBF, 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#WTRMPBF part is unused and in its original packaging.
Return procedure for LT8618EDDB#WTRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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