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Analog Devices Inc. LT8604JDDBM#TRPBF
- Part No.:
- LT8604JDDBM#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
LT8604JDDBM#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 120MA 10DFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,496
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Product details
Overview
LT8604JDDBM#TRPBF from Analog Devices is a high-efficiency, 42V input, 120mA synchronous step-down DC/DC converter in a 10-lead 3mm × 2mm side-wettable DFN package. It delivers regulated 5V output with >90% efficiency at 50mA (12VIN→5VOUT), features 35ns minimum on-time, 2.5µA quiescent current in Burst Mode, and operates up to 2.2MHz. Designed for automotive housekeeping supplies and industrial IoT sensors requiring stable low-power regulation under wide input voltage (3.2V–42V).
For engineers reviewing the LT8604JDDBM#TRPBF datasheet, LT8604JDDBM#TRPBF pinout, LT8604JDDBM#TRPBF application, or LT8604JDDBM#TRPBF equivalent, key selection criteria include its AEC-Q100 qualification (J-grade, –40°C to +150°C), ultralow IQ regulation of 24VIN to 3.3VOUT, ±7.5% power-good accuracy, internal compensation, and compatibility with external RT resistor programming (200kHz–2.2MHz).
Technical Context
The LT8604JDDBM#TRPBF implements constant-frequency current-mode control with integrated top/bottom NMOS switches, enabling fast transient response and stable operation across load and line variations. Its architecture includes frequency foldback during startup/overload, internal 0.778V reference, and slope-compensated PWM for robustness at high duty cycles.
Unlike the LT8604C variant, the LT8604J lacks SYNC/MODE and HYST pins and operates exclusively in Burst Mode - eliminating external clock synchronization or forced continuous mode selection. It retains EN/UV hysteresis (40mV), PG flag with ±7.5% threshold, and BIAS pin optimization for 3.3V–25V outputs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.2V to 42V - supports direct connection to automotive battery rails and industrial 24V/36V systems without pre-regulation. |
| Output Current | 120mA - sufficient for powering microcontrollers, sensors, and interface ICs in space-constrained applications. |
| Quiescent Current | 2.5µA at 24VIN → 3.3VOUT - enables multi-year battery life in always-on sensor nodes. |
| Switching Frequency | 200kHz to 2.2MHz (RT-programmable) - allows compact magnetics and EMI filtering while avoiding AM band interference. |
| Feedback Reference | 0.778V ±1.6% - enables precise output voltage setting via standard resistor dividers with minimal drift over temperature. |
| Min On-Time | 35ns - supports high VIN-to-low VOUT conversion (e.g., 42V→3.3V) at 2MHz without pulse-skipping. |
| Power-Good Threshold | ±7.5% of VOUT - provides reliable system reset signaling with tight tolerance for critical downstream logic. |
Pinout & Package
LT8604JDDBM#TRPBF uses a 10-lead (3mm × 2mm) plastic side-wettable DFN package with exposed thermal pad (Pin 11 = GND). The package supports automated optical inspection (AOI) and enhanced thermal performance (θJA = 76°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BST | Bootstrap supply for high-side gate driver | Requires 47nF ceramic capacitor to SW; enables efficient 100% duty cycle capability and fast top-FET turn-on. |
| SW | Switch node | Connects directly to inductor; must be minimized in PCB layout to reduce EMI and switching losses. |
| BIAS | Internal regulator bias supply | Tie to VOUT (≥3.3V) to reduce VIN current draw and improve efficiency; bypass with 1µF ceramic if externally sourced. |
| INTVCC | Internal 3.4V regulator output | Decouple with ≥1µF ceramic to GND; powers control circuitry - do not load externally. |
| RT | Frequency-setting resistor input | Grounded via resistor (e.g., 18.2kΩ for 2MHz); sets oscillator frequency with ±10% tolerance. |
| FB | Feedback input | Regulated to 0.778V; connects to resistor divider tap - determines output voltage with <±0.1% line regulation. |
| TR/SS | Soft-start and tracking control | Internal 2µA pull-up enables RC-programmed ramp rate; pulled low during fault for safe shutdown. |
| PG | Power-good open-drain output | Asserts high when VOUT is within ±7.5% of target and no fault - drives MCU reset or enable logic. |
| EN/UV | Enable and undervoltage lockout | 1.04V rising threshold with 40mV hysteresis - supports programmable VIN brownout protection via resistor divider. |
| VIN | Main input supply | Supplies top switch and internal circuitry; requires local 10µF low-ESR ceramic capacitor placed adjacent to pin. |
Key Features
| Feature | Design Value |
|---|---|
| Ultralow quiescent current | 2.5µA IQ at 24VIN → 3.3VOUT enables decades-long operation in energy-harvesting and battery-backed systems. |
| AEC-Q100 qualified (Grade 1) | Rated for –40°C to +150°C junction temperature - validated for under-hood automotive housekeeping and industrial motor control environments. |
| Integrated synchronous power stage | Eliminates external diode and reduces conduction loss - achieves >90% efficiency at light loads without external components. |
| Internal compensation | Reduces BOM count and design risk - no external compensation network required for stable operation across all operating conditions. |
| Output soft-start and tracking | Prevents inrush current and enables seamless power sequencing with multiple rails using TR/SS pin voltage control. |
Applications
| Automotive Housekeeping Supplies | Industrial IoT Sensors |
|---|---|
Use Scenario: Powering CAN transceivers, LIN controllers, and microcontrollers in engine control units (ECUs) and body electronics modules. IC Role / Device Role / Timing Role: Primary 5V/3.3V point-of-load regulator delivering clean, stable voltage from noisy 12V/24V battery rail. Use Value: AEC-Q100 Grade 1 qualification ensures reliability at 150°C junction temperature; 42V absolute max input withstands load-dump transients. | Use Scenario: Supplying ultra-low-power environmental sensors (temperature, humidity, pressure) in wireless mesh networks. IC Role / Device Role / Timing Role: Always-on buck converter maintaining regulation during sleep cycles with sub-µA standby current. Use Value: 2.5µA Burst Mode IQ extends coin-cell or energy-harvesting battery life beyond 10 years; small DFN footprint saves board area. |
| 4–20mA Current Loop Transmitters | Flow Meters |
Use Scenario: Providing isolated or non-isolated 3.3V/5V supply for precision DACs, op-amps, and microcontrollers in loop-powered field instruments. IC Role / Device Role / Timing Role: High-efficiency, low-noise DC/DC stage converting loop-derived 12–42V into stable analog front-end voltage. Use Value: Output ripple <10mVP-P minimizes noise coupling into sensitive analog signal paths; wide VIN range accommodates varying loop compliance. | Use Scenario: Powering ultrasonic transducers, signal conditioning circuits, and RF modules in smart water/gas flow meters. IC Role / Device Role / Timing Role: Compact, thermally robust regulator supporting operation inside sealed, high-temperature meter housings. Use Value: Exposed-pad DFN package with θJA = 76°C/W enables reliable operation at ambient temperatures up to 85°C without heatsinking. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT8604EDDBM#TRPBF | Same pinout and electrical specs, but rated for –40°C to +125°C junction temperature (E-grade). | Not qualified for automotive under-hood use; suitable for commercial/industrial indoor applications. | Select when full AEC-Q100 qualification and 150°C operation are unnecessary - lower cost and broader availability. |
| LT8604IDDBM#TRPBF | Identical functionality and package, rated for –40°C to +125°C (I-grade) with extended reliability screening. | Targeted at industrial automation where extended temperature range is needed but automotive qualification is not required. | Choose for harsh industrial environments requiring higher reliability than E-grade but without automotive certification overhead. |
Compared with LT8604EDDBM#TRPBF and LT8604IDDBM#TRPBF, the LT8604JDDBM#TRPBF uniquely supports continuous operation at 150°C junction temperature with full AEC-Q100 validation - making it the only option for under-hood automotive power management where thermal derating is unacceptable.
Availability
LT8604JDDBM#TRPBF is available at Aetrix Electronics and suitable for automotive housekeeping supplies, industrial IoT sensors, and 4–20mA current loop transmitters requiring stable component supply with guaranteed long-term availability and automotive-grade traceability.
Supply support for LT8604JDDBM#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 LT8604 family is part of Analog Devices' Power by Linear™ portfolio, designed specifically for space-constrained, high-reliability DC/DC conversion in automotive and industrial applications demanding ultralow IQ, wide VIN range, and AEC-Q100 compliance.
FAQ
What is the maximum junction temperature rating for LT8604JDDBM#TRPBF?
The LT8604JDDBM#TRPBF is specified for operation from –40°C to +150°C junction temperature and is fully qualified to AEC-Q100 Grade 1 standards. This rating enables reliable deployment in under-hood automotive environments and high-ambient industrial enclosures where thermal management is constrained. Derating curves in the datasheet define safe operating area based on PCB copper area and airflow.
Does LT8604JDDBM#TRPBF support forced continuous mode (FCM)?
No, LT8604JDDBM#TRPBF does not support forced continuous mode. It is the base LT8604 variant (not LT8604C) and operates exclusively in Burst Mode to achieve ultralow quiescent current. The LT8604C version adds SYNC/MODE and HYST pins to enable FCM, spread spectrum, and external synchronization - features absent in the LT8604J.
Can LT8604JDDBM#TRPBF be used with a 47µH inductor?
Yes, LT8604JDDBM#TRPBF supports inductors from 33µH to 100µH depending on output voltage and load requirements. A 47µH inductor is commonly used with 5V output at 2MHz switching frequency and delivers optimal balance of ripple current, transient response, and efficiency per the typical application circuits in the datasheet.
What is the purpose of the BIAS pin on LT8604JDDBM#TRPBF?
The BIAS pin on LT8604JDDBM#TRPBF supplies current to the internal regulator when tied to an external voltage ≥3.2V - typically VOUT for 3.3V–25V outputs. This reduces VIN current draw and improves overall efficiency. If unused, tie BIAS to GND; if driven externally, bypass with a 1µF ceramic capacitor.
How is power-good (PG) functionality implemented in LT8604JDDBM#TRPBF?
The PG pin on LT8604JDDBM#TRPBF is an open-drain output that goes high only when the FB voltage is within ±7.5% of the 0.778V reference and no fault (e.g., thermal shutdown, UVLO) is present. It remains valid as long as VIN >3.2V, independent of EN/UV state, enabling robust system power sequencing and reset assertion.
LT8604JDDBM#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):
- 3.2V
- Voltage - Input (Max):
- 42V
- Voltage - Output (Min/Fixed):
- 0.78V
- Voltage - Output (Max):
- 42V
- Current - Output:
- 120mA
- Frequency - Switching:
- 200kHz ~ 2.2MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount, Wettable Flank
- Supplier Device Package:
- 10-DFN (3x2)
LT8604JDDBM#TRPBF FAQ
1.How can I place an order for LT8604JDDBM#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8604JDDBM#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 LT8604JDDBM#TRPBF reliable?
The price and inventory of LT8604JDDBM#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8604JDDBM#TRPBF is usually 5 days.
3.What payment methods are accepted for LT8604JDDBM#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8604JDDBM#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8604JDDBM#TRPBF?
LT8604JDDBM#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8604JDDBM#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 LT8604JDDBM#TRPBF?
For technical support, including LT8604JDDBM#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8604JDDBM#TRPBF requirements.
6.How does Aetrix verify that LT8604JDDBM#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT8604JDDBM#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 LT8604JDDBM#TRPBF meets industry standards.
7.What is the process for return or replacement of LT8604JDDBM#TRPBF?
All LT8604JDDBM#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8604JDDBM#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 LT8604JDDBM#TRPBF part is unused and in its original packaging.
Return procedure for LT8604JDDBM#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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