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Analog Devices Inc. LT8604JDDBM#TRMPBF
- Part No.:
- LT8604JDDBM#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
LT8604JDDBM#TRMPBF.pdf
- Description:
- IC REG BUCK ADJ 120MA 10DFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,300
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Product details
Overview
LT8604JDDBM#TRMPBF 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 2.5µA quiescent current in Burst Mode, 35ns minimum on-time, and operates up to 2.2MHz. It serves as a compact housekeeping supply in automotive and industrial sensor systems requiring ultra-low IQ and wide VIN range.
For engineers reviewing the LT8604JDDBM#TRMPBF datasheet, LT8604JDDBM#TRMPBF pinout, LT8604JDDBM#TRMPBF application, or LT8604JDDBM#TRMPBF equivalent, key selection criteria include its AEC-Q100 qualified J-grade (–40°C to 150°C), 3.2V–42V input range, internal compensation, soft-start/tracking capability, and absence of SYNC/MODE pin-distinguishing it from the LT8604C variant.
Technical Context
The LT8604JDDBM#TRMPBF implements constant-frequency current-mode control with internal top/bottom NMOS switches, 0.778V feedback reference, and frequency foldback during start-up or overcurrent. Its architecture supports ultralow IQ regulation via Burst Mode only-no forced continuous or spread-spectrum modes-making it optimized for always-on, low-power subsystems.
It uses internal slope compensation for stability across load conditions and relies on external RT resistor for frequency setting (200kHz–2.2MHz). The BIAS pin enables efficiency optimization by sourcing internal circuitry from VOUT when ≥3.2V, reducing VIN current draw. Thermal shutdown and PG flag with ±7.5% output accuracy provide system-level protection and monitoring.
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 supplies without pre-regulation. |
| Output Current | 120mA max - sufficient for powering microcontrollers, sensors, and interface ICs in space-constrained modules. |
| Quiescent Current | 2.5µA at 24VIN→3.3VOUT - enables multi-year battery life in IoT edge nodes and always-on automotive modules. |
| Switching Frequency | 200kHz to 2.2MHz (RT-programmable) - allows small external 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. |
| Package | 10-Lead 3mm × 2mm Side-Wettable DFN - provides enhanced solder joint inspection capability and thermal performance (θJA = 76°C/W). |
Pinout & Package
LT8604JDDBM#TRMPBF uses the DDBM 10-lead (3mm × 2mm) plastic side-wettable DFN package with exposed thermal pad (Pin 11 = GND). Pin 11 must be soldered to PCB ground plane for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BST (Pin 1) | Bootstrap Supply | Drives top NMOS gate above VIN; requires 47nF ceramic capacitor placed adjacent to IC for reliable high-side switching. |
| SW (Pin 2) | Switch Node | Connects directly to inductor; critical high-dI/dt node requiring minimized PCB loop area to reduce EMI and switching losses. |
| BIAS (Pin 3) | Internal Regulator Input | When tied to VOUT ≥3.2V, powers internal circuitry instead of VIN-reducing input current and improving light-load efficiency. |
| INTVCC (Pin 4) | Internal 3.4V Regulator Output | Bypass with ≥1µF ceramic capacitor; supplies gate drivers and control logic; not for external loading. |
| RT (Pin 5) | Frequency Set | Resistor to GND sets oscillator frequency; 18.2kΩ yields ~2MHz, 221kΩ yields ~200kHz-enables design flexibility without changing IC. |
| FB (Pin 6) | Feedback Input | Regulated to 0.778V; connects to resistor divider tap-defines output voltage with ±1.6% tolerance over full temperature range. |
| TR/SS (Pin 7) | Soft-Start/Tracking | 2µA internal pull-up enables RC-programmed output ramp rate; pulled low during fault for controlled shutdown. |
| PG (Pin 8) | Power Good Flag | Open-drain output asserts high when VOUT is within ±7.5% of target and no faults exist-used for system sequencing and monitoring. |
| EN/UV (Pin 9) | Enable / UVLO Input | Hysteretic threshold (1.04V rising, 1.00V falling); enables VIN undervoltage lockout or external enable control with simple resistor divider. |
| VIN (Pin 10) | Main Power Input | Supplies top switch and internal circuitry; requires local high-frequency bypass capacitor (e.g., 10µF ceramic + 1µF X7R) near pin. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Qualified (J Grade) | Rated for –40°C to 150°C junction temperature-validated for under-hood automotive housekeeping and industrial high-temp environments. |
| Ultralow Quiescent Current | 2.5µA IQ at 24VIN→3.3VOUT enables energy harvesting and battery-powered applications with multi-year runtime. |
| Internal Compensation | Eliminates external compensation network-reduces BOM count, layout complexity, and tuning effort for stable operation. |
| Output Soft-Start & Tracking | TR/SS pin allows controlled power-up sequencing and synchronization with other rails-prevents inrush current and ensures orderly system boot. |
| Small 3mm × 2mm DFN Package | Side-wettable leads support automated optical inspection (AOI) and improve solder joint reliability in high-vibration automotive applications. |
Applications
| Automotive Housekeeping Supplies | Industrial Sensors |
|---|---|
Use Scenario: Powering CAN transceivers, LIN controllers, and EEPROMs in engine control units (ECUs) where input voltage varies from 5.5V (cold crank) to 42V (load dump). IC Role / Device Role / Timing Role: Primary 5V/3.3V point-of-load regulator providing stable, low-noise supply independent of main rail fluctuations. Use Value: 2.5µA quiescent current prevents battery drain during vehicle sleep mode; 42V rating eliminates need for upstream TVS or LDO pre-regulator. | Use Scenario: Supplying MEMS pressure sensors and analog front-ends in smart flow meters deployed in oil/gas pipelines with ambient temperatures up to 125°C. IC Role / Device Role / Timing Role: Compact, thermally robust DC/DC converter delivering regulated 3.3V from 12–24V field wiring. Use Value: J-grade qualification ensures reliable operation at 150°C junction; 35ns min on-time supports 24V→3.3V conversion at 2MHz for minimal filter size. |
| 4–20mA Current Loops | Industrial IoT Edge Nodes |
Use Scenario: Providing isolated auxiliary power for HART modems and loop-powered transmitters in process automation systems. IC Role / Device Role / Timing Role: Secondary regulator deriving clean 5V from loop supply to power digital circuitry without disrupting 4–20mA signal integrity. Use Value: Burst Mode operation maintains <10mVP-P ripple at µA-level loads-preserving signal-to-noise ratio in precision analog measurement paths. | Use Scenario: Powering ultra-low-power microcontrollers (e.g., ARM Cortex-M0+) and sub-GHz RF transceivers in wireless condition-monitoring nodes mounted on rotating machinery. IC Role / Device Role / Timing Role: Always-on buck converter enabling wake-on-event functionality with nanowatt standby consumption. Use Value: 2.5µA IQ extends coin-cell or supercapacitor lifetime beyond 5 years; internal soft-start prevents brown-out during cold boot. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT8604CDDB#TRMPBF | Includes SYNC/MODE and HYST pins; supports forced continuous mode, spread spectrum, and external sync; integrates BST/INTVCC capacitors. | Required where fast transient response, EMI reduction, or clock synchronization is needed-e.g., high-resolution ADC power domains. | Select LT8604CDDB#TRMPBF only if Burst Mode is insufficient and FCM/spread-spectrum capability is essential; not drop-in compatible due to pinout and feature differences. |
| LMQ66430RJR | 36V, 3A buck with 2.5µA IQ, 3.8mm × 3.8mm QFN; includes enable, power good, and adjustable soft-start-but no internal compensation. | Suitable for higher-current applications (>120mA) where board space permits larger package and external compensation is acceptable. | Choose LMQ66430RJR when output current demand exceeds 120mA or when TI ecosystem compatibility is prioritized; requires additional compensation components. |
Compared with LT8604CDDB#TRMPBF, the LT8604JDDBM#TRMPBF offers lower cost and simpler implementation for fixed-function, low-IQ applications but lacks programmable modes. Versus LMQ66430RJR, it provides superior thermal performance in smaller footprint and guaranteed AEC-Q100 J-grade operation-critical for automotive under-hood use.
Availability
LT8604JDDBM#TRMPBF is available at Aetrix Electronics and suitable for automotive housekeeping supplies, industrial sensor modules, 4–20mA current loops, and industrial IoT edge nodes requiring stable component supply across extended temperature ranges.
Supply support for LT8604JDDBM#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 LT8604 series belongs to Analog Devices' Power by Linear™ portfolio of high-efficiency, high-voltage DC/DC regulators designed specifically for space-constrained, low-power, and automotive-qualified applications demanding ultralow quiescent current and wide input voltage range.
FAQ
What is the maximum operating junction temperature for LT8604JDDBM#TRMPBF?
The LT8604JDDBM#TRMPBF is rated for a maximum junction temperature of 150°C and is fully specified and guaranteed over the –40°C to 150°C operating junction temperature range. This J-grade qualification makes it suitable for under-hood automotive applications and high-ambient industrial environments where thermal margins are critical. Derating curves and thermal impedance data (θJA = 76°C/W) are provided in the official datasheet to support thermal design validation for LT8604JDDBM#TRMPBF.
Does LT8604JDDBM#TRMPBF support forced continuous mode (FCM)?
No, LT8604JDDBM#TRMPBF does not support forced continuous mode. It is the base LT8604 variant and operates exclusively in Burst Mode for ultralow quiescent current. The LT8604C variant (e.g., LT8604CDDB#TRMPBF) adds the SYNC/MODE pin to enable FCM, spread spectrum, and external synchronization. LT8604JDDBM#TRMPBF lacks this pin and associated internal logic-its operation is fixed to Burst Mode only, which is ideal for always-on, low-power applications where EMI constraints allow.
What is the purpose of the BIAS pin on LT8604JDDBM#TRMPBF?
The BIAS pin on LT8604JDDBM#TRMPBF allows the internal regulator to draw current from the output rail (VOUT) instead of VIN when VOUT ≥3.2V-significantly reducing input supply current and improving light-load efficiency. For a 3.3V or 5V output, tie BIAS directly to VOUT; for outputs below 3.2V, connect BIAS to GND. This feature is especially valuable in battery-powered systems, as it lowers total system IQ and extends operational lifetime without requiring external bias supplies. The LT8604JDDBM#TRMPBF datasheet specifies 0.9mA typical BIAS pin current under 30mA load conditions.
Can LT8604JDDBM#TRMPBF be used in AEC-Q100 automotive applications?
Yes, LT8604JDDBM#TRMPBF is AEC-Q100 qualified for automotive applications. Its J-grade temperature rating (–40°C to 150°C) and qualification testing meet AEC-Q100 Rev H stress test requirements for Grade 0 components. It is explicitly designated for automotive housekeeping supplies-including ECU, ADAS, and body electronics-where reliability under thermal cycling, vibration, and voltage transients is mandatory. The "J" in LT8604JDDBM#TRMPBF denotes this automotive qualification, and full reliability reports are available from Analog Devices upon request.
What is the minimum recommended input capacitance for LT8604JDDBM#TRMPBF?
The minimum recommended input capacitance for LT8604JDDBM#TRMPBF is 10µF ceramic (X7R or better) placed as close as possible to the VIN and GND pins, supplemented by a 1µF high-frequency ceramic capacitor. This dual-capacitor approach ensures low impedance across both bulk energy storage (10µF) and high-frequency switching noise suppression (1µF). Layout best practices require the positive terminal of the 10µF capacitor to be within 2mm of VIN and the negative terminal within 2mm of the exposed GND pad (Pin 11)-critical for minimizing input voltage droop and EMI in LT8604JDDBM#TRMPBF designs.
LT8604JDDBM#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):
- 3.2V
- 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#TRMPBF FAQ
1.How can I place an order for LT8604JDDBM#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8604JDDBM#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 LT8604JDDBM#TRMPBF reliable?
The price and inventory of LT8604JDDBM#TRMPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8604JDDBM#TRMPBF is usually 5 days.
3.What payment methods are accepted for LT8604JDDBM#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8604JDDBM#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8604JDDBM#TRMPBF?
LT8604JDDBM#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8604JDDBM#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 LT8604JDDBM#TRMPBF?
For technical support, including LT8604JDDBM#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8604JDDBM#TRMPBF requirements.
6.How does Aetrix verify that LT8604JDDBM#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LT8604JDDBM#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 LT8604JDDBM#TRMPBF meets industry standards.
7.What is the process for return or replacement of LT8604JDDBM#TRMPBF?
All LT8604JDDBM#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8604JDDBM#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 LT8604JDDBM#TRMPBF part is unused and in its original packaging.
Return procedure for LT8604JDDBM#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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