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Analog Devices Inc. LT8618EDDB-3.3#TRPBF
- Part No.:
- LT8618EDDB-3.3#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
LT8618EDDB-3.3#TRPBF.pdf
- Description:
- IC REG BUCK 3.3V 100MA 10DFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,044
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Product details
Overview
LT8618EDDB-3.3#TRPBF from Analog Devices is a monolithic synchronous step-down DC/DC converter delivering up to 100mA at fixed 3.3V output, supporting 3.4V–60V input (65V transient), operating up to 2.2MHz, and consuming only 2.5µA quiescent current in Burst Mode. It integrates top/bottom power MOSFETs, internal compensation, soft-start, and power-good signaling-designed for industrial sensors and automotive housekeeping supplies.
For engineers reviewing the LT8618EDDB-3.3#TRPBF datasheet, LT8618EDDB-3.3#TRPBF pinout, LT8618EDDB-3.3#TRPBF application, or LT8618EDDB-3.3#TRPBF equivalent, key selection criteria include its 3.3V fixed output, 10-Lead DFN package, ±7.5% PG threshold accuracy, 35ns minimum on-time, and AEC-Q100 qualification for automotive use.
Technical Context
The LT8618EDDB-3.3#TRPBF uses constant-frequency current-mode control with integrated 3Ω top and 1.3Ω bottom NMOS switches, enabling high efficiency across wide load ranges. Its internal 0.778V reference regulates the OUT pin to precisely 3.3V (±3% over temperature and line), with FB/OUT voltage line regulation of ±0.06%/V.
Burst Mode operation reduces quiescent current to 2.5µA at 48VIN→3.3VOUT, while forced continuous mode (not available on this variant) is reserved for LT8618C. The device features thermal shutdown, UVLO with 1.05V enable threshold and 50mV hysteresis, and a dedicated PG flag asserting when VOUT is within ±7.5% of target.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3V ±3% (guaranteed over –40°C to 125°C junction) |
| Input Voltage Range | 3.4V to 60V continuous (65V absolute max transient) |
| Max Output Current | 100mA - sufficient for low-power microcontrollers and sensors |
| Quiescent Current | 2.5µA in Burst Mode - enables multi-year battery life in always-on IoT nodes |
| Switching Frequency | 200kHz to 2.2MHz (set via RT resistor) - supports compact magnetics and EMI filtering |
| Minimum On-Time | 35ns - enables high VIN/VOUT ratios (e.g., 48V→3.3V) without pulse-skipping instability |
| Power-Good Accuracy | ±7.5% window around 3.3V - ensures reliable system reset and sequencing |
Pinout & Package
LT8618EDDB-3.3#TRPBF is housed in 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 operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BST | Bootstrap supply for high-side gate driver | Requires 47nF ceramic capacitor to SW; enables full enhancement of top NMOS switch |
| SW | Switch node | Connects directly to inductor; critical high-dI/dt node requiring minimal PCB loop area |
| BIAS | Bias supply input | Tie to VOUT (3.3V) to reduce VIN current draw; improves efficiency at high input voltages |
| INTVCC | Internal 3.4V regulator bypass | Must be decoupled with ≥1µF ceramic cap; powers internal logic and gate drivers |
| RT | Frequency setting resistor connection | Resistor to GND sets switching frequency (200kHz–2.2MHz); determines size of external inductor |
| OUT | Fixed 3.3V regulated output | Internal feedback divider connects here; no external resistors required |
| TR/SS | Soft-start and tracking control | Capacitor here controls output ramp rate; enables power sequencing with other rails |
| PG | Open-drain power-good flag | Asserts high when VOUT is within ±7.5% of 3.3V and no fault exists |
| EN/UV | Enable and input undervoltage lockout | 1.05V rising threshold with 50mV hysteresis; allows programmable VIN start-up |
| VIN | Main input supply | Supplies internal circuitry and top switch; requires local high-frequency bypass capacitor |
Key Features
| Feature | Design Value |
|---|---|
| Ultralow IQ Burst Mode | 2.5µA at 48VIN→3.3VOUT enables >10-year battery life in remote sensor nodes |
| Integrated Power Switches | 3Ω top / 1.3Ω bottom NMOS eliminate external FETs and drive complexity |
| Fixed 3.3V Output | No external feedback resistors needed - reduces BOM count and layout sensitivity |
| AEC-Q100 Qualified | Rated for automotive housekeeping (Grade E, –40°C to 125°C) with full reliability testing |
| Robust Protection Suite | Thermal shutdown, UVLO, PG flag, and current-limiting prevent damage under fault conditions |
Applications
| Industrial Sensor Power | 4–20mA Loop Supply |
|---|---|
|
Use Scenario: Powering low-current analog sensor front-ends (e.g., pressure, temperature transducers) in harsh factory environments. IC Role / Device Role / Timing Role: Primary 3.3V housekeeping rail for signal conditioning ICs and ADCs. Use Value: 2.5µA quiescent current extends battery life; 60V input withstands industrial bus transients. |
Use Scenario: Providing isolated 3.3V bias for loop-powered transmitter ICs in process control systems. IC Role / Device Role / Timing Role: Regulated auxiliary supply enabling precise current-sink operation. Use Value: Fixed 3.3V output eliminates trimming; ±7.5% PG flag ensures safe loop activation. |
| Automotive Body Electronics | IIoT Edge Node Power |
|
Use Scenario: Powering door module MCUs, LIN transceivers, and LED drivers in 12V/24V vehicle architectures. IC Role / Device Role / Timing Role: Secondary buck regulator for non-safety-critical subsystems. Use Value: AEC-Q100 qualification ensures reliability; 35ns min-on-time supports cold-crank (6V) operation. |
Use Scenario: Supplying wireless SoCs (e.g., BLE, LoRa) and environmental sensors in battery-operated edge devices. IC Role / Device Role / Timing Role: Primary system regulator managing sleep/wake cycles. Use Value: Burst Mode extends shelf life; small 3mm×2mm DFN saves PCB space in compact enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT8618IDDB-3.3#TRPBF | Same electrical specs but rated for –40°C to 125°C with guaranteed performance over full range (vs. E-grade design assurance) | Suitable for extended-temperature industrial control where full characterization is required | Select when full temp-range specification compliance is mandatory per IEC 61000-6-4 or similar standards |
| LT8618JDDB-3.3#TRPBF | Same functionality with extended junction temperature rating (–40°C to 150°C) and higher thermal robustness | Required for under-hood automotive applications or high-ambient industrial enclosures | Choose when ambient exceeds 105°C or thermal derating margin is critical for long-term reliability |
Compared with LT8618EDDB-3.3#TRPBF, the I-grade offers tighter production test coverage across temperature, while the J-grade adds 25°C higher max junction temperature-both retain identical pinout, footprint, and electrical behavior, enabling drop-in replacement where thermal or qualification requirements escalate.
Availability
LT8618EDDB-3.3#TRPBF is available at Aetrix Electronics and suitable for industrial sensors, 4–20mA current loops, and automotive housekeeping supplies requiring stable component supply, long-lifecycle support, and AEC-Q100-compliant sourcing.
Supply support for LT8618EDDB-3.3#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 precision instrumentation, industrial automation, and automotive markets.
The LT8618 family delivers compact, high-efficiency 100mA buck regulators for space-constrained, low-power systems where ultralow IQ, wide VIN range, and automotive qualification are essential.
FAQ
What is the output voltage tolerance of the LT8618EDDB-3.3#TRPBF over temperature and line?
The LT8618EDDB-3.3#TRPBF delivers a fixed 3.3V output with ±3% tolerance over the full –40°C to 125°C junction temperature range and 3.4V–60V input voltage range. This is achieved via laser-trimmed internal feedback resistors and verified by production testing per Analog Devices' datasheet Rev. F specifications.
Does the LT8618EDDB-3.3#TRPBF support external frequency synchronization?
No, the LT8618EDDB-3.3#TRPBF does not support external synchronization. That feature is exclusive to the LT8618C variant, which includes a dedicated SYNC/MODE pin. The LT8618EDDB-3.3#TRPBF uses an RT resistor to set frequency between 200kHz and 2.2MHz and operates only in Burst Mode or forced continuous mode (via EN/UV control).
Can the LT8618EDDB-3.3#TRPBF be used with a 48V input to generate 3.3V at 100mA?
Yes, the LT8618EDDB-3.3#TRPBF is fully specified for 48V input operation, delivering 3.3V at up to 100mA with >85% efficiency (per typical curves in datasheet Figure G10). Its 35ns minimum on-time prevents pulse-skipping instability, and thermal design must account for ~1.2W dissipation at full load.
What is the purpose of the BIAS pin on the LT8618EDDB-3.3#TRPBF?
The BIAS pin on the LT8618EDDB-3.3#TRPBF allows the IC to draw gate drive and bias current from the 3.3V output instead of VIN, reducing input supply current and improving efficiency-especially at high input voltages like 24V or 48V. It must be tied directly to the OUT pin for optimal performance.
Is the LT8618EDDB-3.3#TRPBF pin-compatible with other variants in the LT8618 family?
Yes, the LT8618EDDB-3.3#TRPBF shares identical 10-Lead DFN pinout and footprint with LT8618IDDB-3.3#TRPBF and LT8618JDDB-3.3#TRPBF. All three use the same pin functions (BST, SW, BIAS, INTVCC, RT, OUT, TR/SS, PG, EN/UV, VIN, GND), enabling direct mechanical replacement across temperature grades.
LT8618EDDB-3.3#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:
- 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)
LT8618EDDB-3.3#TRPBF FAQ
1.How can I place an order for LT8618EDDB-3.3#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8618EDDB-3.3#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 LT8618EDDB-3.3#TRPBF reliable?
The price and inventory of LT8618EDDB-3.3#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8618EDDB-3.3#TRPBF is usually 5 days.
3.What payment methods are accepted for LT8618EDDB-3.3#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8618EDDB-3.3#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8618EDDB-3.3#TRPBF?
LT8618EDDB-3.3#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8618EDDB-3.3#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 LT8618EDDB-3.3#TRPBF?
For technical support, including LT8618EDDB-3.3#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8618EDDB-3.3#TRPBF requirements.
6.How does Aetrix verify that LT8618EDDB-3.3#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT8618EDDB-3.3#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 LT8618EDDB-3.3#TRPBF meets industry standards.
7.What is the process for return or replacement of LT8618EDDB-3.3#TRPBF?
All LT8618EDDB-3.3#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8618EDDB-3.3#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 LT8618EDDB-3.3#TRPBF part is unused and in its original packaging.
Return procedure for LT8618EDDB-3.3#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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