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Analog Devices Inc. LT8618CAV#TRMPBF
- Part No.:
- LT8618CAV#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 12-VFQFN Exposed Pad
- Datasheet:
-
LT8618CAV#TRMPBF.pdf
- Description:
- IC REG BUCK ADJ 100MA 12LQFN
- Quantity:
- Payment:
- Shipping:
Inventory:588
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Product details
Overview
LT8618CAV#TRMPBF from Analog Devices is a high-efficiency, 65V-input synchronous step-down DC/DC regulator delivering up to 100mA output with 2.2MHz switching, 35ns minimum on-time, and ultralow 2.5µA quiescent current in Burst Mode. It features SYNC/MODE pin for forced continuous, Burst, or spread-spectrum operation and internal BST/INTVCC capacitors for compact layout. Used in automotive housekeeping supplies and industrial IoT sensors requiring stable low-power bias rails.
For engineers reviewing the LT8618CAV#TRMPBF datasheet, LT8618CAV#TRMPBF pinout, LT8618CAV#TRMPBF application, or LT8618CAV#TRMPBF equivalent, key selection criteria include its 2mm × 2mm LQFN package, ±7.5% power-good accuracy, 0.778V feedback reference, adjustable 200kHz–2.2MHz frequency via RT resistor, and programmable EN/UV hysteresis via HYST pin.
Technical Context
The LT8618CAV#TRMPBF implements constant-frequency current-mode control with integrated top/bottom NMOS switches, internal 0.778V reference, and slope compensation. Its 35ns minimum on-time enables high VIN/VOUT ratios (e.g., 48V-to-3.3V) at 2MHz without pulse-skipping artifacts.
SYNC/MODE pin configures four distinct operating modes: ground for Burst Mode (ultralow IQ), floating for forced continuous mode (predictable EMI), >3V for spread-spectrum, or external clock input for synchronization-enabling noise-sensitive sampling systems to align switching edges away from critical acquisition windows.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.4V to 60V continuous (65V transient); supports wide industrial and automotive supply rails without external protection. |
| Output Current | 100mA max; sufficient for powering microcontrollers, ADCs, and sensor signal chains in space-constrained designs. |
| Switching Frequency | 200kHz to 2.2MHz (RT-programmable); enables small magnetics and avoids AM radio band while supporting fast transient response. |
| Quiescent Current | 2.5µA in Burst Mode; extends battery life in always-on industrial monitoring nodes. |
| Feedback Reference | 0.778V ±1.6% over temperature; enables precise output regulation with minimal external resistor tolerance impact. |
| Power-Good Accuracy | ±7.5% window around regulated VOUT; provides reliable system reset signaling without external comparators. |
| Minimum On-Time | 35ns typ; allows direct 48V-to-3.3V conversion at 2MHz, eliminating intermediate stages. |
Pinout & Package
LT8618CAV#TRMPBF uses a 12-lead 2mm × 2mm LQFN (Laminate QFN) package with exposed thermal pad (Pin 13 = GND). The package supports high-density PCB layouts and efficient thermal dissipation (θJA = 51°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (1) | Main input power supply | Accepts 3.4V–60V; requires local ceramic bypass to minimize high-frequency ripple injection. |
| EN/UV (2) | Enable and undervoltage lockout input | 1.05V rising threshold with 50mV hysteresis; supports programmable input UVLO using external divider. |
| HYST (3) | EN/UV hysteresis control | Open-drain output pulled low when EN/UV < 1V; allows user-adjustable hysteresis via external pull-up resistor. |
| PG (4) | Power-good open-drain flag | Asserts high when VOUT is within ±7.5% of target and no fault; drives MCU reset or status LED directly. |
| FB (5) | Feedback voltage sense | Regulated to 0.778V; connects to resistor divider for adjustable output or fixed-voltage variants. |
| TR/SS (6) | Soft-start and tracking control | 2µA internal pull-up; capacitor sets output ramp rate; supports voltage sequencing with other rails. |
| SYNC/MODE (7) | Operating mode selection | Selects Burst Mode (GND), Forced Continuous (float), Spread Spectrum (>3V), or external sync (clock input). |
| RT (8) | Frequency setting resistor | Resistor to GND sets fSW from 200kHz to 2.2MHz; determines inductor size and EMI profile. |
| BIAS (9) | Bias supply input | Reduces VIN current draw when tied to VOUT ≥3.2V; improves efficiency in high-VIN applications. |
| SW (10) | Switch node | Connects to inductor; high dV/dt node requiring minimized trace area and tight layout to reduce EMI. |
| DNC (11) | No-connect | Must remain unconnected; not internally bonded or used in any function. |
| GND (12) | Analog and power ground | Primary ground return; exposed pad (Pin 13) must be soldered to PCB ground plane for thermal and electrical performance. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated BST and INTVCC capacitors | Eliminates two external 1µF ceramics, reducing BOM count and board area in space-critical modules. |
| Programmable EN/UV hysteresis | HYST pin enables precise, user-defined hysteresis independent of internal 50mV default-critical for stable brown-in/brown-out behavior. |
| Synchronous rectification | Top/bottom NMOS switches with 3Ω/1.3Ω RDS(on) minimize conduction loss across load range, enabling >90% efficiency at 30mA. |
| Spread-spectrum modulation | Reduces peak EMI by spreading switching energy across 200kHz bandwidth-meets CISPR 25 Class 5 without added shielding. |
| Internal soft-start and tracking | TR/SS pin supports controlled output ramp and seamless voltage sequencing with other regulators in multi-rail systems. |
Applications
| Industrial Sensor Power | Automotive Housekeeping Supply |
|---|---|
|
Use Scenario: Powering MEMS pressure sensors and analog front-ends in harsh industrial environments with 24V/48V bus inputs. IC Role / Device Role / Timing Role: Primary 3.3V bias rail generator with ultralow IQ and high input voltage tolerance. Use Value: Enables 10-year battery life in wireless transmitters and eliminates need for pre-regulator stages due to 60V continuous rating. |
Use Scenario: Providing clean, sequenced 3.3V/5V rails for infotainment microcontrollers and CAN transceivers in vehicle body electronics. IC Role / Device Role / Timing Role: Secondary housekeeping regulator synchronized to main system clock to avoid interference with RF receivers. Use Value: SYNC/MODE pin allows forced continuous mode during data acquisition windows, eliminating burst-mode noise coupling into sensitive analog circuits. |
| 4–20mA Loop Transmitter | Flow Meter Electronics |
|
Use Scenario: Generating isolated or non-isolated 3.3V supply for loop-powered smart transmitter ICs with HART modulation capability. IC Role / Device Role / Timing Role: Low-noise, high-PSRR post-regulator downstream of loop supply, rejecting common-mode ripple. Use Value: Output ripple <10mVP-P ensures HART signal integrity; 35ns min on-time supports direct 36V-to-3.3V conversion without cascaded converters. |
Use Scenario: Powering ultrasonic time-of-flight measurement circuitry and DSP in battery-operated portable flow meters. IC Role / Device Role / Timing Role: Main system regulator with soft-start and PG flag for safe initialization of precision timing circuits. Use Value: TR/SS pin enables controlled ramp to prevent inrush-induced voltage droop on shared supply; PG flag validates rail stability before enabling measurement sequence. |
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#TRMPBF | 10-lead DFN (3mm × 2mm); no SYNC/MODE or HYST pins; no internal BST/INTVCC caps; Burst Mode only. | Lacks programmable operating modes and hysteresis adjustment; suited for cost-sensitive, fixed-function applications. | Select when design requires only basic Burst Mode operation and board area is less constrained than with LQFN. |
| LT8618A-3.3#TRMPBF | Fixed 3.3V output; 10-lead DFN; no FB pin; no SYNC/MODE; includes internal feedback resistors. | Eliminates external resistor network but forfeits output adjustability and mode control; optimized for plug-and-play 3.3V use. | Choose for simplified 3.3V supply where flexibility is unnecessary and footprint matches existing DFN layouts. |
Compared with LT8618EDDB#TRMPBF and LT8618A-3.3#TRMPBF, the LT8618CAV#TRMPBF uniquely delivers full mode configurability (Burst/FCM/spread-spectrum/sync), user-adjustable EN hysteresis, and integrated capacitors-all in a 40% smaller 2mm × 2mm LQFN package-making it optimal for noise-sensitive, space-constrained, and multi-rail industrial systems.
Availability
LT8618CAV#TRMPBF is available at Aetrix Electronics and suitable for industrial sensors, automotive housekeeping supplies, and 4mA–20mA current loop transmitters requiring stable component supply, long-term lifecycle support, and AEC-Q100-aligned reliability.
Supply support for LT8618CAV#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 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 specifically for high-input-voltage, low-quiescent-current DC/DC conversion in space- and noise-constrained industrial and automotive subsystems-emphasizing robustness, EMI control, and ease of integration.
FAQ
What is the maximum continuous input voltage rating for the LT8618CAV#TRMPBF?
The LT8618CAV#TRMPBF supports 60V continuous input voltage, with 65V absolute maximum rating for transient conditions only. This enables direct connection to 48V industrial buses and automotive 36V nominal systems without external clamping or pre-regulation, simplifying power architecture and improving system efficiency.
How does the SYNC/MODE pin affect EMI performance in the LT8618CAV#TRMPBF?
The SYNC/MODE pin on the LT8618CAV#TRMPBF enables spread-spectrum modulation when pulled high (>3V), which dithers the switching frequency across a 200kHz bandwidth. This reduces peak radiated emissions by up to 10dB compared to fixed-frequency operation-helping the LT8618CAV#TRMPBF meet stringent CISPR 25 Class 5 requirements in automotive applications without added filtering.
Can the LT8618CAV#TRMPBF operate with an output voltage lower than 3.3V?
Yes-the LT8618CAV#TRMPBF is an adjustable regulator with a 0.778V feedback reference. Using an external resistor divider on the FB pin, it can generate output voltages down to ~0.8V (limited by minimum duty cycle and practical inductor selection), making it suitable for powering low-voltage FPGAs, ASICs, or specialized analog circuitry beyond standard 3.3V/5V rails.
What is the purpose of the HYST pin on the LT8618CAV#TRMPBF, and how is it used?
The HYST pin on the LT8618CAV#TRMPBF is an open-drain logic output that pulls low when the EN/UV pin voltage falls below 1V. By connecting an external pull-up resistor to this pin, designers can set custom hysteresis values-enabling precise, application-specific brown-in/brown-out thresholds independent of the internal 50mV default-critical for stable operation in noisy industrial power environments.
Does the LT8618CAV#TRMPBF require external BST and INTVCC capacitors?
No-the LT8618CAV#TRMPBF integrates both the BST boost capacitor and INTVCC bypass capacitor internally. This eliminates two 1µF ceramic components required by other members of the LT8618 family (e.g., LT8618EDDB#TRMPBF), reducing total solution size, BOM count, and layout complexity-especially valuable in ultra-compact modules like flow meter PCBs or sensor nodes.
LT8618CAV#TRMPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 12-VFQFN 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:
- 12-LQFN (2x2)
LT8618CAV#TRMPBF FAQ
1.How can I place an order for LT8618CAV#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8618CAV#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 LT8618CAV#TRMPBF reliable?
The price and inventory of LT8618CAV#TRMPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8618CAV#TRMPBF is usually 5 days.
3.What payment methods are accepted for LT8618CAV#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8618CAV#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8618CAV#TRMPBF?
LT8618CAV#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8618CAV#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 LT8618CAV#TRMPBF?
For technical support, including LT8618CAV#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8618CAV#TRMPBF requirements.
6.How does Aetrix verify that LT8618CAV#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LT8618CAV#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 LT8618CAV#TRMPBF meets industry standards.
7.What is the process for return or replacement of LT8618CAV#TRMPBF?
All LT8618CAV#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8618CAV#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 LT8618CAV#TRMPBF part is unused and in its original packaging.
Return procedure for LT8618CAV#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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