LT8608/
LT8608B
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LT8608/
LT8608B

42V, 1.5A Synchronous Step-Down Regulator with 2.5μA Quiescent Current

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file View Data Sheet (Rev.E)
Documentation View All Documentation
LTspice LT8608 Demo Circuit - 2MHz Low EMI High Voltage Synchronous Buck Regulator (5.5-42V to 5V @ 1.5A) Download 3.00KB LTspice LT3045-1 - LDO Linear Regulators, LT8608 - Step-Down (Buck) Regulators Download 3.45 KB LTspice LT8608 - Step-Down (Buck) Regulators, LT3041 - LDO Linear Regulators Download 3.49 KB LTspice LT8608 - Step-Down (Buck) Regulators Download 1.95 KB
Part Models 34
1ku List Price Starting From $2.65
Features
  • Wide Input Voltage Range: 3.0V to 42V
  • Ultralow Quiescent Current Burst Mode® Operation:
    • <2.5μA IQ Regulating 12VIN to 3.3VOUT
    • Output Ripple <10mVP-P
  • High Efficiency 2MHz Synchronous Operation:
    • >92% Efficiency at 0.5A, 5VOUT from 12VIN
  • 1.5A Continuous Output Current
  • Fast Minimum Switch-On Time: 35ns
  • Adjustable and Synchronizable: 200kHz to 2.2MHz
  • Spread Spectrum Frequency Modulation for Low EMI
  • Allows Use of Small Inductors
  • Low Dropout
  • Peak Current Mode Operation
  • Accurate 1V Enable Pin Threshold
  • Internal Compensation
  • Output Soft-Start and Tracking
  • Small 10-Lead MSOP Package or 8-Lead 2mm × 2mm DFN Package
  • AEC-Q100 Qualified for Automotive Applications
Additional Details
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The LT8608 is a compact, high efficiency, high speed synchronous monolithic step-down switching regulator that consumes only 1.7µA of quiescent current. The LT8608 can deliver 1.5A of continuous current. Low ripple Burst Mode operation enables high efficiency down to very low output currents while keeping the output ripple below 10mV. Internal compensation with peak current mode topology allows the use of small inductors and results in fast transient response and good loop stability. The EN/ UV pin has an accurate 1V threshold and can be used to program VIN undervoltage lockout or to shut down the LT8608. The PG flag signals when VOUT is within ±8.5% of the programmed output voltage as well as fault conditions.

The MSOP package includes a SYNC pin to synchronize to an external clock, or to select Burst Mode operation or pulse-skipping with or without spread-spectrum; the TR/SS pin programs soft-start or tracking. The DFN package omits these pins and can be purchased in pulse-skipping or Burst Mode operation varieties.

APPLICATIONS

  • General Purpose Step Down
  • Low EMI Step Down
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Documentation View All Documentation
LTspice LT8608 Demo Circuit - 2MHz Low EMI High Voltage Synchronous Buck Regulator (5.5-42V to 5V @ 1.5A) Download 3.00KB LTspice LT3045-1 - LDO Linear Regulators, LT8608 - Step-Down (Buck) Regulators Download 3.45 KB LTspice LT8608 - Step-Down (Buck) Regulators, LT3041 - LDO Linear Regulators Download 3.49 KB LTspice LT8608 - Step-Down (Buck) Regulators Download 1.95 KB
Part Models 34
1ku List Price Starting From $2.65
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LT8608/
LT8608B

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Data Sheet

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UPDATED 12/03/2020
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LT8608/LT8608B: 42V, 1.5A Synchronous Step-Down Regulator with 2.5μA Quiescent Current Data Sheet (Rev.E)

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LT8608: 静止電流が2.5μAの42V、1.5A同期整流式降圧レギュレータ データシート (Rev.0)

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DC2458A - Demo Manual redirect icon

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DN558 - Bidirectional DC/DC Regulator and Supercapacitor Charger redirect icon

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DN558 - 双向 DC/DC 稳压器和超级电容器充电器 redirect icon

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UPDATED 08/01/2018
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42V Monolithic Synchronous Step-Down Regulators with 2.5µA Quiescent Current and Ultralow EMI redirect icon

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具2.5 μA静态电流和超低EMI的42 V单片式同步降压型稳压器 redirect icon

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42V入力／同期整流方式のモノリシック型降圧レギュレータ、2.5μAの静止電流と極めて高いEMI性能を実現 redirect icon

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95% Efficient at 2MHz 42V Synchronous Buck redirect icon

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Documentation

Technical Documents 6
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Data Sheet 1

LT8608/LT8608B: 42V, 1.5A Synchronous Step-Down Regulator with 2.5μA Quiescent Current Data Sheet (Rev.E)

Reliability Data 1

R570 Reliability Data

User Guide 1

DC2458A - Demo Manual

Design Note 2

DN558 - Bidirectional DC/DC Regulator and Supercapacitor Charger
42V Monolithic Synchronous Step-Down Regulators with 2.5µA Quiescent Current and Ultralow EMI

Technical Articles 1

95% Efficient at 2MHz 42V Synchronous Buck

ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal. View our quality and reliability program and certifications for more information.

Part Model Pin/Package Drawing Documentation CAD Symbols, Footprints, and 3D Models
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LT8608EMSE#PBF 10-Lead MSOP w/ EP external-link
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LT8608EMSE#TRPBF 10-Lead MSOP w/ EP external-link
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LT8608HDC#TRMPBF 8-Lead DFN (2mm x 2mm w/ EP) external-link
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LT8608IDC#TRMPBF 8-Lead DFN (2mm x 2mm w/ EP) external-link
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LT8608IMSE#PBF 10-Lead MSOP w/ EP external-link
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LT8608JDC#WTRMPBF 8-Lead DFN (2mm x 2mm w/ EP) external-link
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LT8608JMSE#WPBF 10-Lead MSOP w/ EP external-link
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LT8609B
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42V, 3A Synchronous Step-Down Regulator with 2.5µA Quiescent Current

Evaluation Kits 2

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DC2521A-B

LT8608BEDC Demo Board | 5.5V to 42V Input down to 5V at 1.5A at 2MHz with pulse-skipping mode

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DC2521A-B

LT8608BEDC Demo Board | 5.5V to 42V Input down to 5V at 1.5A at 2MHz with pulse-skipping mode

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DC2521A-B
LT8608BEDC Demo Board | 5.5V to 42V Input down to 5V at 1.5A at 2MHz with pulse-skipping mode
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Product Detail

Demonstration circuit 2521A is a 42V, 1.5A micropower synchronous step-down regulator featuring the LT8608/ LT8608B. There are two assembly versions. DC2521A-A is for the LT8608 and DC2521A-B is for the LT8608B.

The LT8608/LT8608B is a compact, high efficiency, high speed synchronous monolithic step-down switching regulator. Top and bottom power switches, compensation components and other necessary circuits are inside of the 2mm × 2mm DFN package to minimize external components and simplify design. The difference LT8608 and LT8608B is the LT8608 works under low ripple Burst Mode® operation at light load condition, while the LT8608B has pulse-skipping mode for light load. Due to the Burst Mode operation, LT8608 consumes only 1.7μA of quiescent current when output is regulated at 5V. LT8608B has higher quiescent current because of its pulse-skipping mode operation.

The demo board is designed for 5V output from a 5.5V to 42V input. The wide input range allows a variety of input sources, such as automotive batteries and industrial supplies.

The demo board has an EMI filter installed. To use the EMI filter, the input should be tied to VEMI, not VIN. An inductor L2, which is a 0Ω jumper on the board by default now, can be added in the EMI filter to further reduce the conducted emission.

The LT8608 data sheet gives a complete description of the part, operation and application information. The data sheet must be read in conjunction with this demo manual for DC2521A.

Resources

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DC2521A-B Schematics Download

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DC2521A-B Design Files Download

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DC2521A-B Demo Manual (Rev.0) Download

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DC2458A

LT8608 Demo Board | Sync Buck, 5.5V ≤ VIN ≤ 42V, VOUT = 5V @ 1.5A (fSW = 2MHz)

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DC2458A

LT8608 Demo Board | Sync Buck, 5.5V ≤ VIN ≤ 42V, VOUT = 5V @ 1.5A (fSW = 2MHz)

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DC2458A
LT8608 Demo Board | Sync Buck, 5.5V ≤ VIN ≤ 42V, VOUT = 5V @ 1.5A (fSW = 2MHz)
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Product Detail

Demonstration circuit 2458A is a 42V, 1.5A micropower synchronous step-down regulator featuring the LT8608. The demo board is designed for 5V output from a 5.5V to 42V input. The wide input range allows a variety of input sources, such as automotive batteries and industrial supplies. The LT8608 is a compact, high efficiency, high speed synchronous monolithic step-down switching regulator that consumes only 2.5μA of quiescent current when output is regulated at 5V. Top and bottom power switches, compensation components and other necessary circuits are inside of the LT8608 to minimize external components and simplify design.


 


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DC2458A - Schematic Download

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DC2458A - Demo Manual Download

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DC2458A - Design Files Download

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Evaluation Kits2

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DC2521A-B

LT8608BEDC Demo Board | 5.5V to 42V Input down to 5V at 1.5A at 2MHz with pulse-skipping mode
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DC2458A

LT8608 Demo Board | Sync Buck, 5.5V ≤ VIN ≤ 42V, VOUT = 5V @ 1.5A (fSW = 2MHz)

Tools & Simulations 2

LTspice® is a powerful, fast and free simulation software, schematic capture and waveform viewer with enhancements and models for improving the simulation of analog circuits.

To launch ready-to-run LTspice demonstration circuits for this part:

Step 1: Download and install LTspice on your computer.

Step 2: Click on the link in the section below to download a demonstration circuit.

Step 3: If LTspice does not automatically open after clicking the link below, you can instead run the simulation by right clicking on the link and selecting “Save Target As.” After saving the file to your computer, start LTspice and open the demonstration circuit by selecting ‘Open’ from the ‘File’ menu.

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LT8608 Demo Circuit - 2MHz Low EMI High Voltage Synchronous Buck Regulator (5.5-42V to 5V @ 1.5A) Download

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LT3045-1 - LDO Linear Regulators, LT8608 - Step-Down (Buck) Regulators Download

3.45 K

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LT8608 - Step-Down (Buck) Regulators, LT3041 - LDO Linear Regulators Download

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LT8608 - Step-Down (Buck) Regulators Download

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