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Analog Devices Inc. LT8618IDDB-3.3#TRMPBF
- Part No.:
- LT8618IDDB-3.3#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
LT8618IDDB-3.3#TRMPBF.pdf
- Description:
- IC REG BUCK 3.3V 100MA 10DFN
- Quantity:
- Payment:
- Shipping:
Inventory:559
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Product details
Overview
LT8618IDDB-3.3#TRMPBF from Analog Devices is a monolithic synchronous step-down DC/DC converter delivering up to 100mA at fixed 3.3V output, operating from 3.4V to 60V input (65V transient), with 2.5µA quiescent current in Burst Mode and 35ns minimum on-time. It features internal compensation, soft-start, power-good flag, and AEC-Q100 qualification for automotive housekeeping supplies.
For engineers reviewing the LT8618IDDB-3.3#TRMPBF datasheet, LT8618IDDB-3.3#TRMPBF pinout, LT8618IDDB-3.3#TRMPBF application, or LT8618IDDB-3.3#TRMPBF equivalent, key selection criteria include input voltage range, light-load efficiency, thermal grade (–40°C to 125°C), fixed-output configuration, and DFN package compatibility with industrial sensor and 4–20mA loop designs.
Technical Context
The LT8618IDDB-3.3#TRMPBF uses constant-frequency current-mode control with internal top/bottom NMOS switches and an integrated 0.778V reference. Its feedback node is internally connected to the fixed 3.3V output, eliminating external resistors. The device supports ultralow-IQ Burst Mode operation and includes thermal shutdown and input UVLO with 1.05V enable threshold.
It operates in forced continuous mode only when externally synchronized or configured via RT resistor (200kHz–2.2MHz), but defaults to Burst Mode for highest light-load efficiency. The 10-lead 3mm × 2mm DFN package features an exposed GND pad for thermal management and side-wettable variants are available for automotive-grade reflow inspection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3V ±3% over load/line/temp - eliminates need for external feedback divider |
| Input Voltage Range | 3.4V to 60V continuous (65V transient) - supports wide-range industrial and automotive inputs |
| Quiescent Current | 2.5µA in Burst Mode at 48VIN → 3.3V - enables multi-year battery life in always-on sensors |
| Switching Frequency | Adjustable 200kHz–2.2MHz via RT resistor - allows EMI optimization and inductor size reduction |
| Min On-Time | 35ns - enables high step-down ratios (e.g., 48V→3.3V) at 2MHz without pulse-skipping |
| Power-Good Flag | Open-drain PG asserts when VOUT is within ±7.5% of 3.3V - provides system-level power sequencing validation |
| Operating Temp | –40°C to +125°C junction - qualified for under-hood and industrial ambient environments |
Pinout & Package
LT8618IDDB-3.3#TRMPBF uses a 10-lead 3mm × 2mm plastic DFN package with exposed thermal pad (Pin 11 = GND). The package is RoHS-compliant, halogen-free, and designed for automated optical inspection (AOI) with side-wettable variants available for automotive applications.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BST | Bootstrap capacitor connection | Drives top NMOS gate above VIN; requires 47nF ceramic cap placed adjacent to IC |
| SW | Switch node | Connects directly to inductor; must be minimized in PCB layout to reduce EMI and switching losses |
| BIAS | Bias supply input | Tie to VOUT (3.3V) 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 internal logic and gate drivers |
| RT | Frequency setting resistor | Resistor to GND sets fSW; 18.2kΩ yields ~2MHz, 221kΩ yields ~200kHz |
| OUT | Fixed 3.3V output | Internally regulated output node; connects to load and output capacitor bank |
| TR/SS | Soft-start/tracking control | Capacitor here controls VOUT ramp rate; internal 2µA pull-up enables simple RC timing |
| PG | Power-good open-drain flag | Pulled low until VOUT stable within ±7.5%; requires external pull-up for MCU reset signaling |
| EN/UV | Enable/undervoltage lockout | 1.05V rising threshold with 50mV hysteresis; tie to VIN for always-on operation |
| VIN | Main input supply | Must be locally bypassed with low-ESR capacitor; positive terminal placed adjacent to PIN 10 |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Qualified | Qualified to Grade I (–40°C to +125°C) for automotive housekeeping rails - meets reliability requirements for engine control and ADAS modules |
| Ultralow Quiescent Current | 2.5µA regulation at 48VIN → 3.3V - enables >10-year battery life in remote IoT sensors |
| Integrated Compensation | No external compensation components required - reduces BOM count and design iteration time |
| Output Soft-Start | Programmable via TR/SS pin capacitor - prevents inrush current and enables controlled power-up sequencing |
| Fast Minimum On-Time | 35ns enables high-frequency operation even at extreme step-down ratios - avoids subharmonic instability |
| Robust Protection | Thermal shutdown, input UVLO, and current-limit protection - ensures safe operation under fault conditions |
Applications
| Industrial Sensors | 4–20mA Current Loops |
|---|---|
Use Scenario: Powering MEMS pressure or temperature sensors in hazardous-area transmitters with 24V loop supply. IC Role / Device Role / Timing Role: Primary 3.3V housekeeping supply for signal conditioning and ADC circuitry. Use Value: 2.5µA IQ ensures loop compliance remains within 4mA minimum while supporting full sensor functionality. | Use Scenario: Providing isolated 3.3V rail for microcontroller and DAC in two-wire 4–20mA transmitter modules. IC Role / Device Role / Timing Role: Fixed-output buck regulator powering digital core and analog front-end. Use Value: Fixed 3.3V output eliminates feedback resistor errors; ±3% tolerance ensures stable DAC reference and MCU operation. |
| Flow Meters | Automotive Housekeeping Supplies |
Use Scenario: Supplying ultrasonic flow meter electronics in water/gas utility meters with wide-input 12–48V DC field power. IC Role / Device Role / Timing Role: Main DC/DC converter for microcontroller, transceiver, and signal processing ASIC. Use Value: 3.4V–60V input range accommodates brownouts and surges common in municipal infrastructure. | Use Scenario: Generating 3.3V for infotainment MCU, CAN transceivers, and display backlight controllers in vehicle body electronics. IC Role / Device Role / Timing Role: Secondary power rail derived from 12V battery with high transient immunity. Use Value: AEC-Q100 Grade I qualification and 65V transient rating ensure robustness against load-dump events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT8618EDDB-3.3#TRMPBF | Same electrical specs and pinout; rated for 0°C to 125°C junction (E-grade) | Not qualified for full –40°C start-up; unsuitable for cold-climate industrial deployments | Select when ambient temperature never drops below 0°C and cost sensitivity outweighs extended temp coverage |
| LT8618JDDB-3.3#TRMPBF | Identical functionality; rated for –40°C to 150°C junction (J-grade) | Supports higher ambient temperatures (e.g., under-hood, enclosed enclosures) | Choose for automotive under-hood or high-temp industrial applications where 150°C operation is required |
Compared with LT8618EDDB-3.3#TRMPBF, the LT8618IDDB-3.3#TRMPBF guarantees full –40°C operation and tighter parametric limits across temperature; versus LT8618JDDB-3.3#TRMPBF, it trades 150°C capability for lower cost while retaining identical performance at ≤125°C.
Availability
LT8618IDDB-3.3#TRMPBF is available at Aetrix Electronics and suitable for industrial sensors, 4–20mA current loops, flow meters, and automotive housekeeping supplies requiring stable component supply, long-term lifecycle support, and AEC-Q100-compliant sourcing.
Supply support for LT8618IDDB-3.3#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 is designed as compact, high-efficiency synchronous step-down regulators for space-constrained, wide-input industrial and automotive power rails where ultralow quiescent current and robust transient handling are critical.
FAQ
What is the guaranteed operating temperature range for LT8618IDDB-3.3#TRMPBF?
The LT8618IDDB-3.3#TRMPBF is specified and guaranteed over a junction temperature range of –40°C to +125°C. This I-grade qualification ensures reliable startup and regulation in cold industrial environments and sustained operation in thermally demanding enclosures, unlike E-grade variants which only guarantee 0°C minimum.
Does LT8618IDDB-3.3#TRMPBF require external feedback resistors?
No. The LT8618IDDB-3.3#TRMPBF integrates the feedback divider for its fixed 3.3V output. Pin 6 is labeled OUT and is internally connected to the regulation node - no external resistors are needed, reducing BOM count and eliminating resistor tolerance errors that affect output accuracy.
How does the EN/UV pin function on LT8618IDDB-3.3#TRMPBF?
The EN/UV pin on LT8618IDDB-3.3#TRMPBF provides enable control and input undervoltage lockout. It has a 1.05V rising threshold with 50mV hysteresis. When pulled above 1.05V, the device enables; below 1.00V, it shuts down. Tying it directly to VIN provides always-on operation, while a resistor divider allows programmable input UVLO.
What is the purpose of the TR/SS pin on LT8618IDDB-3.3#TRMPBF?
TR/SS on LT8618IDDB-3.3#TRMPBF serves dual functions: soft-start and output voltage tracking. An internal 2µA current source charges an external capacitor, controlling the VOUT ramp rate during startup. When driven externally, it also enables tracking of another supply rail - critical for sequencing-sensitive systems like FPGAs or multi-rail MCUs.
Can LT8618IDDB-3.3#TRMPBF be synchronized to an external clock?
No. Synchronization capability is exclusive to the LT8618C variant, which includes a dedicated SYNC/MODE pin. The LT8618IDDB-3.3#TRMPBF (standard LT8618-3.3 family) lacks this pin and operates only in self-oscillating Burst Mode or forced continuous mode set by the RT resistor - no external clock input is supported.
LT8618IDDB-3.3#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:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 3.4V
- Voltage - Input (Max):
- 60V
- Voltage - Output (Min/Fixed):
- 3.3V
- Voltage - Output (Max):
- -
- 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-3.3#TRMPBF FAQ
1.How can I place an order for LT8618IDDB-3.3#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8618IDDB-3.3#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-3.3#TRMPBF reliable?
The price and inventory of LT8618IDDB-3.3#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-3.3#TRMPBF is usually 5 days.
3.What payment methods are accepted for LT8618IDDB-3.3#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8618IDDB-3.3#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8618IDDB-3.3#TRMPBF?
LT8618IDDB-3.3#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8618IDDB-3.3#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-3.3#TRMPBF?
For technical support, including LT8618IDDB-3.3#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8618IDDB-3.3#TRMPBF requirements.
6.How does Aetrix verify that LT8618IDDB-3.3#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LT8618IDDB-3.3#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-3.3#TRMPBF meets industry standards.
7.What is the process for return or replacement of LT8618IDDB-3.3#TRMPBF?
All LT8618IDDB-3.3#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8618IDDB-3.3#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-3.3#TRMPBF part is unused and in its original packaging.
Return procedure for LT8618IDDB-3.3#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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