LT8608/
LT8608B

RECOMMENDED FOR NEW DESIGNS

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

Data Sheet (Rev. E) Product Selection Table
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Overview

  • 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
LT8608/
LT8608B
42V, 1.5A Synchronous Step-Down Regulator with 2.5μA Quiescent Current
LT8608 Application Circuit LT8608 Performance Graph LT8608 Pin Configuration LT8608 Pin Configuration
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Documentation

Data Sheet 1

User Guide 1

Application Note 1

Design Note 2

Technical Articles 4

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Software Resources

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Hardware Ecosystem

Parts Product Life Cycle Description
Overvoltage & Overcurrent Protectors 1
LTC4367
RECOMMENDED FOR NEW DESIGNS 100V Overvoltage, Undervoltage and Reverse Supply Protection Controller
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Tools & Simulations

LTspice 2

Models for the following parts are available in LTspice:

  • LT8608
  • LT8608S

LTpowerCAD 1

Design tools for the following parts are available in LTpowerCAD:

  • LT8608
LTspice

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.

LTpowerCAD

LTpowerCAD® is a power supply design program which selects power stage components, provides detailed power efficiency, shows quick loop Bode plot stability and load transient analysis, and can export to LTspice for simulation.

Evaluation Kits

eval board
schematic 1
schematic 2
schematic 3
schematic 4
schematic 5
DC2458A

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

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Product Details

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.


 


eval board
schematic 6
schematic 7
schematic 8
schematic 9
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 Details

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.
DC2458A
LT8608 Demo Board | Sync Buck, 5.5V ≤ VIN ≤ 42V, VOUT = 5V @ 1.5A (fSW = 2MHz)
DC2458A Demo Board DC2458A Demo Board DC2458A Demo Board DC2458A Demo Board DC2458A - Schematic
DC2521A-B
LT8608BEDC Demo Board | 5.5V to 42V Input down to 5V at 1.5A at 2MHz with pulse-skipping mode
DC2521A-A Evaluation Board DC2521A-A Evaluation Board - Top View DC2521A-A Evaluation Board - Bottom View DC2521A_UG-1403 ApplicationCircuit

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