42V, 3.5A Synchronous Step-Down Regulator with 2.5μA Quiescent Current
Features and Benefits
- LT8610 Feature Set, Plus:
- 3V Minimum Input Voltage
- 800mV Feedback Voltage
- 3.5A Maximum Output Current
- Fast 30ns Minimum Switch-On Time
- Improved Burst Mode Efficiency
- Improved EMI
- Wide Input Voltage Range: 3V to 42V
- Ultralow Quiescent Current Burst Mode® Operation:
- 2.5μA IQ Regulating 12VIN to 3.3VOUT
- High Efficiency Synchronous Operation:
- 95% Efficiency at 1A, 5VOUT from 12VIN
- 93% Efficiency at 1A, 3.3VOUT from 12VIN
- Low Dropout Under All Conditions: 200mV at 1A
- Safely Tolerates Inductor Saturation in Overload
- Adjustable and Synchronizable Frequency:
- LT8610AC: 200kHz to 2.2MHz
- LT8610AC-1: 1.5MHz to 2.2MHz
- Accurate 1.015V Enable Pin Threshold
- Output Soft-Start and Tracking
- Small Thermally Enhanced 16-Lead MSOP Package
The LT8610AC/LT8610AC-1 is a compact, high efficiency, high speed synchronous monolithic step-down switching regulator that consumes only 2.5μA of quiescent current. Compared to the LT8610AB, the LT8610AC/LT8610AC-1 has a lower feedback voltage of 800mV and a lower minimum VIN of 3V. The LT8610AC/LT8610AC-1 has the same additional features of the LT8610AB as compared to the LT8610: higher maximum output current of 3.5A, faster minimum on time of 30ns, and higher light load efficiency.
The LT8610AC/LT8610AC-1 has a SYNC pin for synchronization to an external clock. A capacitor on the TR/SS pin programs the output voltage ramp rate during startup. The PG flag signals when VOUT is within ±8% of the programmed output voltage as well as fault conditions. The LT8610AC-1 has internal compensation optimized for high switching frequencies resulting in improved transient response compared to the LT8610AC. The LT8610AC-1 also has a feature which will soft-start the part when exiting dropout or brownout conditions reducing output voltage overshoot.
|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
- GSM Power Supplies
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.
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.
Design tools for the following parts are available in LTpowerCAD:
LT8610AC Companion Parts
Recommended Related Parts
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.
Sample & Buy
The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Analog Devices, Inc. sales office or authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.