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Analog Devices Inc. LT8618IDDB#TRMPBF
- Part No.:
- LT8618IDDB#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
LT8618IDDB#TRMPBF.pdf
- Description:
- IC REG BUCK ADJ 100MA 10DFN
- Quantity:
- Payment:
- Shipping:
Inventory:577
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Product details
Overview
LT8618IDDB#TRMPBF from Analog Devices is a high-efficiency, 65V-input synchronous step-down DC/DC regulator delivering up to 100mA at 3.3V output with 90%+ efficiency at 30mA (12VIN→3.3VOUT), 2.5µA quiescent current in Burst Mode, and 35ns minimum on-time. It operates continuously from 3.4V to 60V input, supports fixed 3.3V output, and targets industrial sensor and automotive housekeeping supplies.
For engineers reviewing the LT8618IDDB#TRMPBF datasheet, LT8618IDDB#TRMPBF pinout, LT8618IDDB#TRMPBF application, or LT8618IDDB#TRMPBF equivalent, key selection criteria include its 10-Lead DFN package, –40°C to 125°C operating junction temperature, internal compensation, soft-start/tracking capability, and AEC-Q100 qualification for automotive use.
Technical Context
The LT8618IDDB#TRMPBF implements constant-frequency current-mode control with integrated top/bottom NMOS power switches, enabling monolithic operation without external drivers. Its 200kHz–2.2MHz adjustable switching frequency (via RT resistor) and 35ns minimum on-time support high VIN/VOUT ratios and compact magnetics.
Burst Mode operation reduces quiescent current to 2.5µA while maintaining regulation, and the PG flag signals VOUT within ±7.5% of target. Thermal shutdown and UVLO (3.4V start-up) provide fault protection, and the FB pin is regulated to 0.778V for adjustable versions-though LT8618IDDB#TRMPBF is the base part with external feedback.
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 and automotive rails. |
| Output Current | 100mA max; sufficient for powering microcontrollers, sensors, and interface ICs in low-power systems. |
| Quiescent Current | 2.5µA in Burst Mode; critical for battery-backed or energy-harvesting applications requiring ultra-low standby drain. |
| Switching Frequency | 200kHz to 2.2MHz (RT-programmable); allows optimization for EMI, size, or efficiency across diverse layouts. |
| Feedback Reference | 0.778V (typ); sets output voltage via external resistor divider; ensures precise regulation across temperature. |
| Min On-Time | 35ns (typ); supports high step-down ratios (e.g., 48V→3.3V) without pulse-skipping instability. |
| PG Accuracy | ±7.5% output window; provides reliable power-good signaling for system sequencing and fault detection. |
Pinout & Package
LT8618IDDB#TRMPBF uses a 10-Lead (3mm × 2mm) Plastic DFN package with exposed thermal pad (Pin 11 = GND). The package is side-wettable capable and rated for –40°C to 125°C junction temperature.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| BST | Bootstrap Supply | Drives top NMOS gate above VIN; requires 47nF ceramic capacitor placed adjacent to IC for reliable high-side switching. |
| 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 (≥3.2V) to reduce VIN current draw; improves efficiency when output ≥3.3V. |
| INTVCC | Internal Regulator Bypass | Decoupling node for 3.4V internal supply; requires ≥1µF low-ESR ceramic cap to stabilize gate drivers and control logic. |
| RT | Frequency Set | Resistor-to-ground sets oscillator frequency; 18.2kΩ yields ~2MHz, enabling compact 33µH inductors. |
| FB | Feedback Input | Regulated to 0.778V; connects to resistor divider tap to program output voltage (e.g., 3.3V = R1=309kΩ, R2=1MΩ). |
| TR/SS | Soft-Start/Tracking | 2µA internal pull-up enables capacitor-based voltage ramp control; prevents inrush and enables output tracking. |
| PG | Power Good Flag | Open-drain output active high when VOUT is within ±7.5%; used for system enable sequencing and fault monitoring. |
| EN/UV | Enable / 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 (e.g., 1µF X7R + 10µF tantalum) near pin. |
Key Features
| Feature | Design Value |
|---|---|
| Ultralow Quiescent Current | 2.5µA in Burst Mode enables >10-year battery life in always-on IoT sensors powered from 48V rails. |
| High-Voltage Input Capability | 60V continuous input rating supports direct integration into 24V/48V industrial and automotive subsystems without pre-regulation. |
| Fast Minimum On-Time | 35ns on-time enables stable 48V-to-3.3V conversion at 2MHz, reducing inductor size by >50% vs. legacy 500kHz parts. |
| Integrated Compensation | Eliminates external compensation network, reducing BOM count and layout sensitivity while ensuring stability across load/temperature. |
| Output Soft-Start & Tracking | TR/SS pin allows controlled voltage ramp-up and coordination with other rails-critical for FPGA and multi-rail MCU power sequencing. |
| AEC-Q100 Qualified | Rated for –40°C to 125°C operation and qualified per AEC-Q100 Rev G, enabling use in automotive body electronics and ADAS housekeeping supplies. |
Applications
| Industrial Sensor Nodes | 4–20mA Current Loop Transmitters |
|---|---|
Use Scenario: Powering MEMS pressure sensors and signal-conditioning amplifiers in hazardous-area process instrumentation. IC Role / Device Role / Timing Role: Primary 3.3V housekeeping supply regulating from 24V loop power or auxiliary 48V rail. Use Value: 2.5µA quiescent current preserves loop compliance margin; 60V input withstands field wiring transients. |
Use Scenario: Providing isolated 3.3V bias for DACs, op-amps, and microcontrollers in analog transmitter modules. IC Role / Device Role / Timing Role: Fixed-output buck converter generating clean, low-noise supply referenced to loop ground. Use Value: <10mVP-P output ripple avoids injecting noise into precision 16-bit DAC outputs. |
| Automotive Housekeeping Supplies | Flow Meter Electronics |
Use Scenario: Powering CAN transceivers, LIN controllers, and EEPROM in body control modules. IC Role / Device Role / Timing Role: Secondary regulator deriving 3.3V from 12V battery rail with cold-crank immunity. Use Value: 3.4V UVLO start-up and AEC-Q100 qualification ensure reliable operation during 4.5V battery dips. |
Use Scenario: Supplying ultrasonic time-of-flight measurement ICs and low-power MCUs in battery-operated water/gas meters. IC Role / Device Role / Timing Role: Main system supply enabling burst-mode wake-up every 10 seconds for flow sampling. Use Value: 2.5µA standby current extends AA battery life beyond 5 years under typical metering duty cycles. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT8618IDDB-3.3#TRMPBF | Fixed 3.3V output; internal feedback divider replaces FB pin; same package and temp grade. | Eliminates external resistors but forfeits output adjustability; ideal for cost-sensitive, single-voltage designs. | Select when 3.3V is fixed and board space/resistor count must be minimized. |
| LT8618A-3.3IDDB#TRMPBF | Higher efficiency ('Very High' grade); 200mA current limit (vs. 150mA typ); identical pinout and package. | Better light-load efficiency and higher overload tolerance; suitable for dynamic loads like RF modems or motor drivers. | Select when >90% efficiency at 1mA–10mA loads or robust short-circuit response is required. |
Compared with LT8618IDDB#TRMPBF, the LT8618IDDB-3.3#TRMPBF simplifies design by removing feedback resistors but locks output voltage, while the LT8618A-3.3IDDB#TRMPBF delivers superior light-load efficiency and higher current capability-both retain full pin compatibility and AEC-Q100 qualification.
Availability
LT8618IDDB#TRMPBF is available at Aetrix Electronics and suitable for industrial sensor nodes, 4–20mA current loop transmitters, and automotive housekeeping supplies requiring stable component supply, long-term lifecycle support, and AEC-Q100-compliant sourcing.
Supply support for LT8618IDDB#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, Inc. 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 was designed as compact, high-voltage synchronous buck regulators targeting space-constrained, high-reliability applications in industrial sensing and automotive subsystems where low IQ and wide input range are essential.
FAQ
What is the maximum continuous input voltage rating for the LT8618IDDB#TRMPBF?
The LT8618IDDB#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 automotive 24V/12V systems with load-dump protection margins. Exceeding 60V continuously risks permanent damage per Absolute Maximum Ratings.
Does the LT8618IDDB#TRMPBF include internal compensation?
Yes, the LT8618IDDB#TRMPBF features fully integrated compensation circuitry, eliminating the need for external Type II or Type III compensation networks. This reduces component count, saves PCB area, and ensures stable operation across all load and temperature conditions without tuning.
How does the PG (Power Good) pin function on the LT8618IDDB#TRMPBF?
The PG pin on the LT8618IDDB#TRMPBF is an open-drain output that goes high only when the FB pin voltage is within ±7.5% of the target regulation voltage and no fault (e.g., thermal shutdown, UVLO) is present. It remains valid once VIN exceeds 3.4V, independent of EN/UV state, enabling robust system power sequencing.
Can the LT8618IDDB#TRMPBF be synchronized to an external clock?
No-the LT8618IDDB#TRMPBF does not support external synchronization. Only the LT8618C variant includes a SYNC/MODE pin for synchronization or mode selection. The LT8618IDDB#TRMPBF uses an RT-resistor-programmed oscillator and operates in Burst Mode or forced continuous mode based on load, but lacks external clock input capability.
What is the purpose of the BIAS pin on the LT8618IDDB#TRMPBF?
The BIAS pin on the LT8618IDDB#TRMPBF accepts an external voltage ≥3.2V (typically tied to VOUT) to power internal gate drivers and regulators, reducing VIN current draw and improving overall efficiency-especially beneficial when VOUT is ≥3.3V. If unused, it must be tied to GND.
LT8618IDDB#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)
LT8618IDDB#TRMPBF FAQ
1.How can I place an order for LT8618IDDB#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8618IDDB#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 LT8618IDDB#TRMPBF reliable?
The price and inventory of LT8618IDDB#TRMPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8618IDDB#TRMPBF is usually 5 days.
3.What payment methods are accepted for LT8618IDDB#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8618IDDB#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8618IDDB#TRMPBF?
LT8618IDDB#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8618IDDB#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 LT8618IDDB#TRMPBF?
For technical support, including LT8618IDDB#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8618IDDB#TRMPBF requirements.
6.How does Aetrix verify that LT8618IDDB#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LT8618IDDB#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 LT8618IDDB#TRMPBF meets industry standards.
7.What is the process for return or replacement of LT8618IDDB#TRMPBF?
All LT8618IDDB#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8618IDDB#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 LT8618IDDB#TRMPBF part is unused and in its original packaging.
Return procedure for LT8618IDDB#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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