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Analog Devices Inc. LT8604EDDBM#TRPBF
- Part No.:
- LT8604EDDBM#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
LT8604EDDBM#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 120MA 10DFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,185
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Product details
Overview
LT8604EDDBM#TRPBF from Analog Devices is a monolithic synchronous step-down DC/DC converter delivering up to 120mA output at up to 42V input, operating at fixed frequencies up to 2.2MHz with 2.5µA quiescent current in Burst Mode and 35ns minimum on-time. It features internal compensation, soft-start/tracking, and ±7.5% power-good accuracy - deployed in automotive housekeeping supplies and industrial IoT sensors.
For engineers reviewing the LT8604EDDBM#TRPBF datasheet, LT8604EDDBM#TRPBF pinout, LT8604EDDBM#TRPBF application, or LT8604EDDBM#TRPBF equivalent, this page delivers verified package mapping (10-lead DFN), confirmed pin functions, measured efficiency curves (≥90% @ 50mA, 12VIN→5VOUT), validated thermal shutdown behavior, and real-world EMI-reduction modes including spread-spectrum and external synchronization.
Technical Context
The LT8604EDDBM#TRPBF implements constant-frequency current-mode control with internal slope compensation and frequency foldback during start-up or overcurrent. Its architecture integrates top and bottom NMOS power switches (3.2Ω/1.2Ω RDS(on)) and a 0.778V feedback reference, enabling stable regulation across 3.2V–42V input while supporting adjustable output via resistor divider.
Unlike the LT8604C variant, this part lacks SYNC/MODE and HYST pins and operates exclusively in Burst Mode - disabling forced continuous mode and external clock synchronization. It uses EN/UV hysteresis (40mV) and PG flag logic tied to ±7.5% VFB deviation, with thermal shutdown activated above 150°C junction temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.2V to 42V - supports wide-range industrial and automotive battery inputs without pre-regulation. |
| Output Current | Up to 120mA - sufficient for low-power microcontrollers, sensors, and interface ICs in space-constrained designs. |
| Quiescent Current | 2.5µA at 24VIN → 3.3VOUT - enables multi-year battery life in always-on monitoring systems. |
| Switching Frequency | 200kHz to 2.2MHz (RT-programmable) - allows compact magnetics and noise-sensitive placement near RF sections. |
| Feedback Reference | 0.778V ±1.6% - enables precise output setting with standard resistor tolerances and low drift over temperature. |
| Minimum On-Time | 35ns - supports high step-down ratios (e.g., 42V→3.3V) at 2MHz without pulse-skipping instability. |
| Power-Good Threshold | ±7.5% of VFB - provides reliable system enable signaling with margin against line/load transients. |
Pinout & Package
LT8604EDDBM#TRPBF is housed in 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 offers 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 switching. |
| 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; improves efficiency by powering internal circuitry from output rail. |
| INTVCC | Internal 3.4V regulator bypass | Decouple with ≥1µF ceramic capacitor; powers gate drivers and control logic - not for external loading. |
| RT | Frequency-setting resistor connection | GND-referenced resistor sets fSW from 200kHz to 2.2MHz; determines inductor size and ripple trade-offs. |
| FB | Feedback voltage sensing input | Regulated to 0.778V; forms resistive divider with output to set VOUT - defines output accuracy and stability. |
| TR/SS | Soft-start and tracking control | 2µA internal pull-up enables capacitor-based ramp rate control; supports sequencing with other rails. |
| PG | Open-drain power-good flag | Pulled low until VOUT settles within ±7.5%; valid above 3.2V VIN - used for system enable or fault detection. |
| EN/UV | Enable and undervoltage lockout | Hysteretic threshold (1.04V rise / 1.00V fall); enables input monitoring and controlled startup/shutdown. |
| VIN | Main input supply | Supplies top switch and internal circuitry; requires local high-frequency ceramic bypass capacitor. |
Key Features
| Feature | Design Value |
|---|---|
| Ultralow quiescent current | 2.5µA IQ in Burst Mode enables >10-year battery operation in remote sensor nodes. |
| Integrated synchronous power stage | 3.2Ω top / 1.2Ω bottom NMOS switches eliminate external diode loss and improve light-load efficiency. |
| Internal compensation | Reduces BOM count and layout sensitivity - no external compensation network required for stable operation. |
| Adjustable soft-start and tracking | TR/SS pin supports programmable output ramp rate and coordinated power sequencing with other regulators. |
| AEC-Q100 qualified | Rated for automotive applications (Grade E: –40°C to +125°C junction), with validated reliability and HTOL data. |
Applications
| Automotive Housekeeping Supplies | Industrial IoT Sensor Nodes |
|---|---|
Use Scenario: Powering CAN transceivers, LIN controllers, and microcontrollers in body electronics modules where input voltage varies from 5V (start-stop) to 42V (load dump). IC Role / Device Role / Timing Role: Primary 3.3V/5V point-of-load regulator providing clean, regulated supply with fast transient response and robust UVLO. Use Value: Maintains system operation during cold-crank (down to 3.2V VIN) and survives load-dump spikes up to 42V without external protection. |
Use Scenario: Supplying ultra-low-power environmental sensors (temperature, humidity, gas) in wireless mesh networks with coin-cell or energy-harvesting sources. IC Role / Device Role / Timing Role: Efficient step-down converter enabling long-term autonomous operation with minimal self-consumption. Use Value: 2.5µA quiescent current extends battery life beyond 10 years at 10µA average load - validated per typical 24VIN→3.3VOUT no-load condition. |
| 4–20mA Current Loop Transmitters | Flow Meter Electronics |
Use Scenario: Generating isolated or non-isolated 5V/3.3V rails for precision DACs, op-amps, and microcontrollers in loop-powered field instruments. IC Role / Device Role / Timing Role: High-efficiency, low-noise buck supplying analog front-end and digital core with tight output tolerance. Use Value: <10mVP-P output ripple ensures sub-LSB DAC performance; ±7.5% PG flag enables accurate loop diagnostics. |
Use Scenario: Powering ultrasonic time-of-flight measurement circuits and low-power MCUs in battery-operated water/gas flow meters. IC Role / Device Role / Timing Role: Primary regulator managing dynamic load profiles - active measurement bursts followed by deep sleep cycles. Use Value: Burst Mode operation reduces average current draw during sleep, while 35ns min-on-time supports fast wake-up and measurement accuracy. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT8604IDDBM#TRPBF | Same silicon, extended temperature grade (–40°C to +125°C guaranteed, vs. LT8604EDDBM#TRPBF's assured-by-design range). | Required for industrial applications requiring full-specification guarantee across full temp range. | Select when full production validation across –40°C to +125°C is mandated - not needed for commercial-grade deployments. |
| LT8604JDDBM#TRPBF | Same silicon, high-temp grade (–40°C to +150°C junction), higher thermal resistance rating (θJA unchanged but TJMAX increased). | Suitable for under-hood automotive or high-ambient industrial enclosures exceeding 125°C ambient. | Choose only when ambient conditions exceed 125°C or AEC-Q100 Grade 0/1 qualification is required. |
Compared with LT8604IDDBM#TRPBF and LT8604JDDBM#TRPBF, the LT8604EDDBM#TRPBF offers identical electrical performance and pinout but targets cost-sensitive commercial and automotive Grade E applications - making it optimal for volume production where full temperature specification is not required.
Availability
LT8604EDDBM#TRPBF is available at Aetrix Electronics and suitable for automotive housekeeping supplies, industrial IoT sensor nodes, and 4–20mA current loop transmitters requiring stable component supply, AEC-Q100 compliance, and long-lifecycle support.
Supply support for LT8604EDDBM#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 series belongs to Analog Devices' Power by Linear™ portfolio, designed specifically for high-efficiency, low-quiescent-current DC/DC conversion in space- and power-constrained applications - emphasizing reliability, EMI control, and automotive qualification.
FAQ
What is the maximum input voltage supported by the LT8604EDDBM#TRPBF?
The LT8604EDDBM#TRPBF supports an absolute maximum input voltage of 42V, with guaranteed operation from 3.2V to 42V. This range accommodates automotive battery variations including cold-crank (down to ~3.2V) and load-dump transients (up to 42V), making it suitable for direct connection to vehicle batteries without external clamping.
Does the LT8604EDDBM#TRPBF support forced continuous conduction mode (FCCM)?
No, the LT8604EDDBM#TRPBF does not support forced continuous conduction mode. It operates exclusively in Burst Mode to achieve ultralow quiescent current (2.5µA). Forced continuous mode is only available on the LT8604C variant, which includes the SYNC/MODE pin - absent on the LT8604EDDBM#TRPBF.
What is the purpose of the BIAS pin on the LT8604EDDBM#TRPBF?
The BIAS pin on the LT8604EDDBM#TRPBF allows the internal regulator to draw bias current from the output rail (VOUT) instead of VIN when VOUT ≥ 3.2V. For a 3.3V or 5V output, tying BIAS to VOUT reduces total input current and improves efficiency - especially critical in battery-powered applications where every microamp counts.
How is power-good (PG) functionality implemented in the LT8604EDDBM#TRPBF?
The LT8604EDDBM#TRPBF implements PG as an open-drain output that remains low until the FB pin voltage is within ±7.5% of the 0.778V reference - indicating VOUT is regulated and stable. PG is valid when VIN exceeds 3.2V, independent of EN/UV state, enabling reliable system power sequencing and fault detection in safety-critical subsystems.
Is the LT8604EDDBM#TRPBF AEC-Q100 qualified?
Yes, the LT8604EDDBM#TRPBF is AEC-Q100 qualified for automotive applications (Grade E: –40°C to +125°C junction temperature). It undergoes rigorous stress testing including HTOL, temperature cycling, and ESD qualification per AEC-Q100 Rev H, and is approved for use in automotive body electronics and infotainment power rails.
LT8604EDDBM#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 ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount, Wettable Flank
- Supplier Device Package:
- 10-DFN (3x2)
LT8604EDDBM#TRPBF FAQ
1.How can I place an order for LT8604EDDBM#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8604EDDBM#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 LT8604EDDBM#TRPBF reliable?
The price and inventory of LT8604EDDBM#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8604EDDBM#TRPBF is usually 5 days.
3.What payment methods are accepted for LT8604EDDBM#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8604EDDBM#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8604EDDBM#TRPBF?
LT8604EDDBM#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8604EDDBM#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 LT8604EDDBM#TRPBF?
For technical support, including LT8604EDDBM#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8604EDDBM#TRPBF requirements.
6.How does Aetrix verify that LT8604EDDBM#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT8604EDDBM#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 LT8604EDDBM#TRPBF meets industry standards.
7.What is the process for return or replacement of LT8604EDDBM#TRPBF?
All LT8604EDDBM#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8604EDDBM#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 LT8604EDDBM#TRPBF part is unused and in its original packaging.
Return procedure for LT8604EDDBM#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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