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Analog Devices Inc. LT8618IDDB#TRPBF
- Part No.:
- LT8618IDDB#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
LT8618IDDB#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 100MA 10DFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,521
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Product details
Overview
LT8618IDDB#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 200kHz–2.2MHz adjustable switching frequency. It operates across –40°C to 125°C and targets industrial sensors and 4mA–20mA loop supplies.
For engineers reviewing the LT8618IDDB#TRPBF datasheet, LT8618IDDB#TRPBF pinout, LT8618IDDB#TRPBF application, or LT8618IDDB#TRPBF equivalent, key selection criteria include input voltage range (3.4–60V), ultralow IQ regulation at 48VIN→3.3VOUT, ±7.5% power-good accuracy, internal compensation, and DFN-10 package thermal performance (θJA = 76°C/W).
Technical Context
The LT8618IDDB#TRPBF implements constant-frequency current-mode control with integrated top/bottom NMOS switches, enabling stable regulation without external compensation. Its 35ns minimum on-time supports high VIN/VOUT ratios (e.g., 48V→3.3V) at 2MHz switching.
Burst Mode operation reduces quiescent current to 2.5µA while maintaining regulation; forced continuous mode (via EN/UV threshold or external sync) ensures predictable EMI for sampling systems. The PG flag 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 transient); enables direct connection to 24V/48V industrial rails without pre-regulation. |
| Output Current | 100mA max; sufficient for powering microcontrollers, analog front-ends, and isolated interface ICs in space-constrained designs. |
| Quiescent Current | 2.5µA in Burst Mode at 48VIN→3.3VOUT; extends battery life in always-on sensor nodes. |
| Switching Frequency | 200kHz to 2.2MHz (RT-programmable); allows optimization of size (high fSW → small L/C) vs. efficiency (low fSW → lower switching loss). |
| Feedback Reference | 0.778V ±1.6% over temperature; enables precise output setting via external resistor divider for custom voltages. |
| Power-Good Accuracy | ±7.5% window around regulated VOUT; provides reliable system reset signaling without external monitoring circuitry. |
| Min On-Time | 35ns typical; supports 48V→3.3V conversion at 2MHz without pulse-skipping instability. |
Pinout & Package
LT8618IDDB#TRPBF uses a 10-lead 3mm × 2mm plastic DFN package with exposed thermal pad (Pin 11 = GND). Thermal resistance θJA = 76°C/W; requires PCB copper pour under exposed pad for reliable 125°C junction operation.
| Pin | 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; must be minimized in PCB area to reduce EMI and switching losses. |
| BIAS | Bias supply input | Tie to VOUT for >3.2V outputs to reduce VIN current draw; bypass with 1µF ceramic if externally powered. |
| INTVCC | Internal 3.4V regulator bypass | Decouple with ≥1µF low-ESR ceramic; powers internal logic/drivers; not for external loading. |
| RT | Frequency programming | Resistor to GND sets fSW (200kHz–2.2MHz); determines inductor size and EMI profile. |
| FB | Feedback input | Regulated to 0.778V; connects to resistor divider tap for adjustable output voltage configurations. |
| TR/SS | Soft-start/tracking control | 2µA internal pull-up enables capacitor-based output ramp rate control; pulled low during fault. |
| PG | Power-good open-drain | Asserts high when VOUT is within ±7.5% and no UVLO/fault; requires external pull-up for MCU reset signaling. |
| EN/UV | Enable/undervoltage lockout | 1.05V rising threshold with 50mV hysteresis; supports programmable input UVLO using resistor divider from VIN. |
| VIN | Main input supply | Supplies internal circuitry and top switch; requires local high-frequency ceramic bypass (e.g., 1µF + 10µF) near pin. |
Key Features
| Feature | Design Value |
|---|---|
| Ultralow IQ Burst Mode | 2.5µA input current at 48VIN→3.3VOUT enables multi-year battery operation in remote IoT sensors. |
| 35ns Minimum On-Time | Enables high-step-down ratio (e.g., 48V→3.3V) at 2MHz without duty-cycle limitation or instability. |
| Adjustable Switching Frequency | 200kHz–2.2MHz via RT resistor allows trade-off between inductor size (smaller at 2MHz) and conduction loss (lower at 200kHz). |
| Integrated Power Switches | Top/bottom NMOS with 3Ω/1.3Ω RDS(on) eliminate external FETs and drivers, reducing BOM count and layout complexity. |
| Internal Compensation | Eliminates external compensation network, simplifying design and improving stability across load/line variations. |
| Output Soft-Start & Tracking | TR/SS pin enables controlled startup ramp and sequencing with other rails-critical for mixed-voltage SoC power domains. |
Applications
| Industrial Sensor Node | 4–20mA Current Loop Transmitter |
|---|---|
Use Scenario: Low-power pressure/temperature sensor with SPI interface and analog signal conditioning, powered from 24V loop supply. IC Role / Device Role / Timing Role: Primary 3.3V housekeeping rail regulator; provides clean, stable power to MCU, ADC, and op-amps. Use Value: 2.5µA Burst Mode IQ extends battery life beyond 10 years; 35ns min on-time ensures reliable 24V→3.3V conversion at 2MHz for compact filter design. |
Use Scenario: Two-wire field transmitter converting sensor data into standardized 4–20mA output, operating from 12–48V loop voltage. IC Role / Device Role / Timing Role: Local 3.3V supply for signal processing ICs; withstands wide input transients common in industrial wiring. Use Value: 60V continuous input rating eliminates need for input TVS/clamping; ±7.5% PG accuracy enables robust fault detection during loop break conditions. |
| Automotive Body Control Module | Flow Meter Electronics |
Use Scenario: Non-safety-critical automotive sub-system (e.g., mirror control, ambient lighting) requiring AEC-Q100-compliant 3.3V rail. IC Role / Device Role / Timing Role: Secondary regulator fed from main 12V battery rail; delivers regulated 3.3V to microcontroller and CAN transceiver. Use Value: –40°C to 125°C operating range meets automotive under-hood requirements; internal soft-start prevents inrush current during cold cranking. |
Use Scenario: Battery-powered ultrasonic flow meter with precision analog front-end and low-power MCU, deployed in water/gas infrastructure. IC Role / Device Role / Timing Role: Main power converter for measurement circuitry; operates from primary lithium-thionyl chloride cell (3.6V) or 24V line. Use Value: 3.4V minimum input enables start-up from partially discharged batteries; 100mA output supports pulsed measurement bursts without brownout. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT8618EDDB#TRPBF | Same architecture and pinout, but rated for –40°C to 125°C (E-grade) instead of I-grade; 1.7µA typical IQ vs. 2.5µA. | Lower-cost option for commercial-temperature applications; not qualified for extended industrial ambient. | Select LT8618EDDB#TRPBF only if full –40°C to 125°C operation is not required and lowest possible IQ is critical. |
| LT8618-3.3IDDB#TRPBF | Fixed 3.3V output (no FB divider needed); same package and temp grade, but lacks adjustable feedback and TR/SS flexibility. | Simplifies design where 3.3V is fixed requirement; eliminates two resistors but forfeits soft-start control and voltage customization. | Choose LT8618-3.3IDDB#TRPBF when board space is premium and output voltage is strictly 3.3V with no sequencing needs. |
Compared with LT8618EDDB#TRPBF, the LT8618IDDB#TRPBF offers guaranteed 125°C operation and higher IQ tolerance for harsh environments; versus LT8618-3.3IDDB#TRPBF, it provides design flexibility for non-standard outputs and controlled startup-justifying its use in programmable sensor platforms.
Availability
LT8618IDDB#TRPBF is available at Aetrix Electronics and suitable for industrial sensors, 4mA–20mA current loops, and automotive body electronics requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LT8618IDDB#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 step-down regulation for space- and power-constrained applications such as remote sensors, loop-powered transmitters, and automotive subsystems-emphasizing ultralow IQ, wide input range, and robust thermal performance.
FAQ
What is the maximum continuous input voltage rating for the LT8618IDDB#TRPBF?
The LT8618IDDB#TRPBF supports 60V continuous input voltage operation, with 65V absolute maximum rating for transient conditions only. This allows direct connection to 48V industrial buses and automotive 24V systems without external clamping, provided sustained operation remains ≤60V to ensure reliability and lifetime.
Does the LT8618IDDB#TRPBF require external compensation components?
No, the LT8618IDDB#TRPBF features internal compensation, eliminating the need for external Type-II or Type-III compensation networks. This simplifies layout, reduces BOM count, and guarantees stability across the full load and line range without tuning-ideal for rapid prototyping and high-reliability deployments.
How does the LT8618IDDB#TRPBF achieve 2.5µA quiescent current?
The LT8618IDDB#TRPBF achieves 2.5µA quiescent current by entering Burst Mode operation at light loads: internal control circuitry shuts down between switching bursts, minimizing VIN current draw while maintaining output regulation. This behavior is inherent to the IC's architecture and requires no external configuration.
Can the LT8618IDDB#TRPBF be synchronized to an external clock source?
No-the LT8618IDDB#TRPBF variant does not support external synchronization. Only the LT8618C family members (e.g., LT8618CAV#TRPBF) include a SYNC/MODE pin for clock synchronization or spread-spectrum operation. For sync capability, select LT8618C-grade parts instead of LT8618IDDB#TRPBF.
What is the purpose of the TR/SS pin on the LT8618IDDB#TRPBF?
On the LT8618IDDB#TRPBF, the TR/SS pin provides output voltage soft-start and tracking functionality. An internal 2µA current source charges an external capacitor connected to this pin, controlling the output ramp rate during startup. It also enables voltage sequencing with other regulators when driven by an external reference.
LT8618IDDB#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)
LT8618IDDB#TRPBF FAQ
1.How can I place an order for LT8618IDDB#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8618IDDB#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 LT8618IDDB#TRPBF reliable?
The price and inventory of LT8618IDDB#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8618IDDB#TRPBF is usually 5 days.
3.What payment methods are accepted for LT8618IDDB#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8618IDDB#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8618IDDB#TRPBF?
LT8618IDDB#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8618IDDB#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 LT8618IDDB#TRPBF?
For technical support, including LT8618IDDB#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8618IDDB#TRPBF requirements.
6.How does Aetrix verify that LT8618IDDB#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT8618IDDB#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 LT8618IDDB#TRPBF meets industry standards.
7.What is the process for return or replacement of LT8618IDDB#TRPBF?
All LT8618IDDB#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8618IDDB#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 LT8618IDDB#TRPBF part is unused and in its original packaging.
Return procedure for LT8618IDDB#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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