Features and Benefits
- Wide Input Voltage Range: 3.4V to 42V
- Ultralow Quiescent Current Burst Mode® Operation:
- 2.5μA IQ Regulating 12VIN to 3.3VOUT
- Output Ripple < 10mVP-P
- High Efficiency Synchronous Operation:
- 96% Efficiency at 1A, 5VOUT from 12VIN
- 94% Efficiency at 1A, 3.3VOUT from 12VIN
- Fast Minimum Switch-On Time: 50ns
- Low Dropout Under All Conditions: 200mV at 1A
- Allows Use Of Small Inductors
- Low EMI
- Adjustable and Synchronizable: 200kHz to 2.2MHz
- Current Mode Operation
- Accurate 1V Enable Pin Threshold
- Internal Compensation
- Output Soft-Start and Tracking
- Small Thermally Enhanced 16-Lead MSOP Package
- AEC-Q100 Qualified for Automotive Applications
The LT8610 is a compact, high efficiency, high speed synchronous monolithic step-down switching regulator that consumes only 2.5μA of quiescent current. Top and bottom power switches are included with all necessary circuitry to minimize the need for external components. Low ripple Burst Mode operation enables high efficiency down to very low output currents while keeping the output ripple below 10mVP-P. A SYNC pin allows synchronization to an external clock. 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 LT8610 reducing the input supply current to 1μA. A capacitor on the TR/SS pin programs the output voltage ramp rate during start-up. The PG flag signals when VOUT is within ±9% of the programmed output voltage as well as fault conditions. The LT8610 is available in a small 16-lead MSOP package with exposed pad for low thermal resistance.
|Feedback Voltage||Min VIN||Output Current||Notes|
|LT8610AC-1||0.80V||3.0V||3.5A||Fsw = 1.5MHz to 2.2MHz, Optimized Transient Response|
|LT8610AC||0.80V||3.0V||3.5A||Fsw = 200kHz to 2.2MHz|
|LT8610AB||0.97V||3.4V||3.5A||Improved Burst Mode Efficiency|
|LT8610AX||0.97V||3.4V||3.5A||175°C Max Junction Temp|
|LT8610A||0.97V||3.4V||3.5A||Higher Iout, 30ns Min On Time|
- Automotive and Industrial Supplies
- General Purpose Step-Down
- GSM Power Supplies
Markets and Technologies
Product Lifecycle Production
At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.
Evaluation Kits (1)
Demonstration circuit 1749B is a 42V, 2.5A micropower synchronous step-down regulator featuring the LT8610. The LT8610 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 LT8610 to minimize external components and simplify design.
Documentation & Resources
R570 Reliability Data3/23/2018
95% Efficient at 2MHz 42V Synchronous Buck6/24/2016
Silent Switcher Meets CISPR Class 5 Radiated Emissions While Maintaining High Conversion Efficiency1/1/2014 LT Journal
Minimize Standby Current in Automotive DDR Supplies9/12/2013 LT Journal
The Right Power Supply Can Simplify Automotive ECU Design4/30/2013
42V, 2.5A Synchronous Step-Down Regulator with 2.5μA Quiescent Current7/1/2012
Tools & Simulations
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.
Models for the following parts are available in LTspice:
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.
To open the project file for this circuit:
Step 1: Download and install LTpowerCAD on your computer.
Step 2: Click on the link(s) in the section below to download part-specific project files.
Step 3: If the project file doesn't run, right-click the link and select "Save Target As." Then start the LTpowerCAD tool and open the project file by selecing "Open Project" from the "File" menu.
LTpowerCAD Project Files
Design tools for the following parts are available in LTpowerCAD:
LT8610 Companion Parts
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Sample & Buy
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Pricing displayed is based on 1-piece. The USA list pricing shown is for budgetary use only, shown in United States dollars (FOB USA per unit), and is subject to change. International prices may vary due to local duties, taxes, fees and exchange rates.