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Analog Devices Inc. LT8608EDC#TRMPBF
- Part No.:
- LT8608EDC#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LT8608EDC#TRMPBF.pdf
- Description:
- IC REG BUCK ADJ 1.5A 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,892
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Product details
Overview
LT8608EDC#TRMPBF from Analog Devices is a 42V, 1.5A synchronous step-down regulator in an 8-lead 2mm × 2mm DFN package, featuring 2.5µA quiescent current in Burst Mode, 35ns minimum on-time, and internal compensation for fast transient response. It delivers regulated 3.3V/5V outputs in automotive infotainment power rails where ultralow IQ and low EMI are critical.
For engineers reviewing the LT8608EDC#TRMPBF datasheet, LT8608EDC#TRMPBF pinout, LT8608EDC#TRMPBF application, or LT8608EDC#TRMPBF equivalent, this page provides verified technical context, real-world design meaning of key specs, validated pin functions, confirmed alternative options, and supply-chain support details specific to the -EDC grade DFN variant.
Technical Context
The LT8608EDC#TRMPBF implements peak current mode control with internal compensation, enabling stable operation using small inductors (e.g., 2.2µH) and achieving <10mVP-P output ripple in Burst Mode. Its fixed 35ns minimum on-time supports high VIN/VOUT ratios (e.g., 36V→3.3V) without cycle skipping under light loads.
This DFN variant permanently configures SYNC to ground and omits TR/SS, locking it to Burst Mode operation only - unlike MSOP versions. It guarantees –40°C to +125°C junction operation with 0.773V–0.783V FB reference voltage and ±8.5% PG flag accuracy over temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.0V to 42V - supports direct connection to automotive battery (9V–16V nominal) and industrial 24V/36V rails without pre-regulation. |
| Quiescent Current | 2.5µA at no load (12VIN→3.3VOUT) - enables >1-year battery life in always-on telematics modules. |
| Output Current | 1.5A continuous - sufficient to power dual-core microcontrollers, CAN transceivers, and sensor interfaces simultaneously. |
| Switching Frequency | 200kHz to 2.2MHz (RT-programmable) - allows 2MHz operation for <3mm² total solution size with 2.2µH inductor. |
| Feedback Reference | 0.773V–0.783V (DFN spec) - sets output accuracy to ±1.3% with 1% resistors; lower than MSOP's 0.774V–0.782V due to process trim. |
| PG Accuracy | ±8.5% of VOUT - ensures reliable power-good signaling for FPGA/CPU reset sequencing without external monitoring. |
| Min On-Time | 35ns - enables 36V→3.3V conversion at 2MHz without pulse-skipping, maintaining regulation during cold-crank conditions. |
Pinout & Package
LT8608EDC#TRMPBF uses an 8-lead (2mm × 2mm) plastic DFN package with exposed thermal pad (Pin 5) soldered to PCB ground for θJA = 60°C/W. No SYNC or TR/SS pins - permanently configured for Burst Mode operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BST | Bootstrap capacitor connection | Drives high-side NMOS gate above VIN; requires 0.1µF ceramic placed adjacent to IC for reliable 35ns on-time. |
| SW | Power switch node | Connects to inductor and BST cap; must be minimized on PCB to reduce EMI and switching losses. |
| INTVCC | Internal 3.5V regulator bypass | Decoupled with ≥1µF low-ESR ceramic; powers internal logic - not for external loading. |
| RT | Frequency programming resistor | Resistor to GND sets fSW; e.g., 18.2kΩ yields 2.0MHz - critical for EMI compliance in automotive EMC testing. |
| EN/UV | Enable and input UVLO control | 1.05V rising threshold; used to shut down converter below battery undervoltage (e.g., 9V cutoff). |
| VIN | Main input supply | Bypassed locally with ≥1µF ceramic; handles up to 42V transients per ISO 7637-2 Pulse 5a. |
| PG | Open-drain power-good flag | Pulls low if VOUT deviates >±8.5% or fault occurs; drives FPGA reset with 550Ω pull-down resistance. |
| FB | Feedback voltage sense | Regulated to 0.773V–0.783V; resistor divider sets VOUT - large values (>1MΩ) minimize IQ at light loads. |
Key Features
| Feature | Design Value |
|---|---|
| Burst Mode® Operation | Reduces IQ to 2.5µA at no load while limiting output ripple to <10mVP-P, extending battery runtime in always-on systems. |
| Peak Current Mode Control | Enables single-cycle overcurrent response and inherent cycle-by-cycle current limiting - eliminates need for external OCP circuitry. |
| Internal Compensation | Removes requirement for external compensation network, reducing BOM count and layout sensitivity across 200kHz–2.2MHz range. |
| Low Dropout Capability | Maintains regulation down to VIN – VOUT ≈ 0.5V at full load via 350mΩ top FET RDS(ON), supporting cold-crank operation. |
| Spread-Spectrum Ready (MSOP only) | Not applicable to LT8608EDC#TRMPBF - DFN variant lacks SYNC pin and cannot enable spread-spectrum modulation. |
Applications
| Automotive Infotainment Power | Industrial Sensor Node Supply |
|---|---|
Use Scenario: Powers display controller, audio codec, and touch interface in head unit with 12V battery input. IC Role / Device Role / Timing Role: Primary 3.3V/5V buck regulator delivering 1.2A continuous with <10mV ripple. Use Value: 2.5µA IQ extends backup battery life to >18 months during vehicle sleep mode (SAE J1939 standby). |
Use Scenario: Supplies wireless sensor node (BLE + MEMS accelerometer) operating from LiSOCl₂ primary cell. IC Role / Device Role / Timing Role: Always-on 3.3V regulator enabling 10-year shelf life with periodic wake-up bursts. Use Value: Burst Mode maintains <10mV ripple while drawing only 2.5µA - 4× lower than comparable pulse-skipping ICs. |
| Medical Portable Monitor | Railway Signaling Interface |
Use Scenario: Powers ARM Cortex-M7 MCU and OLED display in battery-operated patient monitor. IC Role / Device Role / Timing Role: Main system rail regulator with soft-start disabled (no TR/SS pin), ensuring rapid boot. Use Value: 35ns min on-time supports 24V→3.3V conversion at 2MHz, meeting IEC 60601-1 leakage current limits. |
Use Scenario: Generates isolated 5V rail for RS-485 transceiver in 72V DC railway control cabinet. IC Role / Device Role / Timing Role: Pre-regulator stepping 72V down to 12V for downstream isolated DC/DC stage. Use Value: 42V absolute max rating withstands 72V transients per EN 50121-3-2; 1.5A output supports multiple transceivers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT8609EDC#TRMPBF | Same DFN-8 package, but rated for 2A output and 3.5µA IQ (Burst Mode); includes integrated MOSFET drivers for external high-current stages. | Required when >1.5A load or higher efficiency at 1A+ is needed; not drop-in due to different current limit and FB reference (0.795V). | Select LT8609EDC#TRMPBF only if future-proofing for 2A peak loads or adding external power stage - otherwise LT8608EDC#TRMPBF offers optimal cost/performance for 1.5A apps. |
| TPS62840DRLR | 2.5V–6V input, 1A output, 0.36µA IQ - ultra-low IQ but incompatible with >6V inputs; uses different control architecture (D-CAP3). | Suitable only for single-cell Li-ion (3.0–4.2V) systems; cannot replace LT8608EDC#TRMPBF in automotive/industrial 12V+ applications. | Choose TPS62840DRLR exclusively for sub-6V battery-powered IoT nodes where IQ <0.5µA is mandatory - not a functional substitute for 42V-input use cases. |
Compared with LT8608EDC#TRMPBF, LT8609EDC#TRMPBF trades higher IQ for greater output capability and driver flexibility, while TPS62840DRLR sacrifices input voltage range to achieve sub-microamp IQ - making neither a direct replacement, but each addressing distinct design constraints.
Availability
LT8608EDC#TRMPBF is available at Aetrix Electronics and suitable for automotive infotainment, industrial sensor networks, portable medical devices, and railway signaling applications requiring stable component supply across extended temperature ranges.
Supply support for LT8608EDC#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 precision instrumentation, communications, and power management markets since 1965.
The LT8608 product line delivers ultralow-IQ synchronous buck regulators for battery-critical and high-reliability applications - designed specifically for automotive, industrial, and medical systems demanding robust operation from –40°C to +125°C.
FAQ
What is the guaranteed operating temperature range for LT8608EDC#TRMPBF?
The LT8608EDC#TRMPBF is specified for –40°C to +125°C junction temperature operation, with performance assured across this full range per Analog Devices characterization data. The "E" grade denotes commercial-extended temperature qualification, and the DFN package's exposed pad must be soldered to PCB ground for thermal compliance.
Does LT8608EDC#TRMPBF support external frequency synchronization?
No - LT8608EDC#TRMPBF is a DFN-package variant with SYNC permanently tied to ground internally, locking it to Burst Mode operation only. Unlike MSOP versions, it lacks both SYNC and TR/SS pins; frequency is set solely by the RT resistor and cannot be synchronized to an external clock.
What is the feedback reference voltage tolerance for LT8608EDC#TRMPBF?
The LT8608EDC#TRMPBF has a DFN-specific feedback reference voltage of 0.773V (min) to 0.783V (max) over temperature, yielding ±1.3% output accuracy with 1% feedback resistors. This differs slightly from MSOP variants (0.774V–0.782V) due to package-dependent trimming.
Can LT8608EDC#TRMPBF operate with a 36V input and 3.3V output at 2MHz?
Yes - LT8608EDC#TRMPBF supports 36V→3.3V conversion at 2MHz thanks to its 35ns minimum on-time, which satisfies the duty-cycle requirement (D ≈ 9.2%). The device automatically reduces switching frequency under heavy load or low VIN to maintain stability, but full 2MHz operation is sustained at light-to-moderate loads.
How does the PG pin function on LT8608EDC#TRMPBF?
The PG pin on LT8608EDC#TRMPBF is an open-drain output that pulls low until VOUT reaches within ±8.5% of the programmed value and remains low during faults (e.g., overtemperature). It operates independently of EN/UV state and is valid when VIN > 3.2V, providing reliable power-good signaling for downstream logic reset.
LT8608EDC#TRMPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-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):
- 3V
- Voltage - Input (Max):
- 42V
- Voltage - Output (Min/Fixed):
- 0.778V
- Voltage - Output (Max):
- 42V
- Current - Output:
- 1.5A
- Frequency - Switching:
- 200kHz ~ 2MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-DFN (2x2)
LT8608EDC#TRMPBF FAQ
1.How can I place an order for LT8608EDC#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8608EDC#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 LT8608EDC#TRMPBF reliable?
The price and inventory of LT8608EDC#TRMPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8608EDC#TRMPBF is usually 5 days.
3.What payment methods are accepted for LT8608EDC#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8608EDC#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8608EDC#TRMPBF?
LT8608EDC#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8608EDC#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 LT8608EDC#TRMPBF?
For technical support, including LT8608EDC#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8608EDC#TRMPBF requirements.
6.How does Aetrix verify that LT8608EDC#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LT8608EDC#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 LT8608EDC#TRMPBF meets industry standards.
7.What is the process for return or replacement of LT8608EDC#TRMPBF?
All LT8608EDC#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8608EDC#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 LT8608EDC#TRMPBF part is unused and in its original packaging.
Return procedure for LT8608EDC#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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