LT8337
LT8337-1

28V, 5A Low I_Q Synchronous Step-Up Silent Switcher with PassThru

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Recommended for New Designs

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Overview

Features and Benefits
Product Details

Features and Benefits

Silent Switcher^® Architecture
Ultralow EMI Emissions
Optional Spread Spectrum Frequency Modulation
Integrated 28V, 5A Power Switches
Wide Input Voltage Range: 2.7V to 28V
Output Voltage Programmable Up to 26V
Low V_IN Pin Quiescent Current
0.3μA in Shutdown
4μA in Burst Mode^® Operation (LT8337)
15μA in PassThru^™ (LT8337)

100% Duty Cycle Capability for Synchronous MOSFET
External Compensation: Fast Transient Response (LT8337-1)
Power Good Monitor (LT8337)
Adjustable and Synchronizable: 300kHz to 3MHz
Pulse-Skipping or Burst Mode Operation at Light Load
Small 16-Lead (3mm × 3mm) LQFN Package

Product Details

The LT8337/LT8337-1 is a low I_Q, synchronous step-up DC/DC converter. It features Silent Switcher architecture and optional spread spectrum frequency modulation (SSFM) to minimize EMI emissions while delivering high efficiencies at high switching frequencies.

The wide input/output voltage range, low V_IN pin quiescent current in Burst Mode operation, and 100% duty-cycle capability for the synchronous MOSFET in PassThru operation (V_IN > V_OUT) makes the LT8337/LT8337-1 ideally suited for battery-powered systems and general purpose step-up applications.

The LT8337/LT8337-1 integrates 28V, 5A power switches, operating at a fixed switching frequency programmable between 300kHz and 3MHz and synchronizable to an external clock. The LT8337/LT8337-1 features output soft-start and output overvoltage lockout.

The LT8337-1 allows external compensation via the V_C pin for fast transient response. The LT8337 offers an output power good flag via the PG pin.

APPLICATIONS

Battery-Powered Systems
General Purpose Step-Up

Product Categories

Power Management

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Product Lifecycle Recommended for New Designs

This product has been released to the market. The data sheet contains all final specifications and operating conditions. For new designs, ADI recommends utilization of these products.

Evaluation Kits (2)

EVAL-LT8337-1-AZ

LT8337-1 | 28V, 5A Low I_Q Synchronous Step-Up Silent Switcher with PassThru and V_C Pin

EVAL-LT8337-AZ

LT8337 |
28V, 5A Low I_Q Synchronous Step-Up Silent Switcher with PassThru

EVAL-LT8337-1-AZ

View Detailed Evaluation Kit Information

Evaluation circuit EVAL-LT8337-1-AZ features the LT8337-1 as a 2MHz low I_Q, synchronous boost converter with a 12V output from 4.5V to 12V input. When V_IN goes above the 12V output regulation setpoint, the LT8337-1 smoothly transitions between regulation and PassThru^™ mode. This evaluation circuit features Spread Spectrum Frequency Modulation (SSFM), Silent Switcher^® technology, and EMI filters to provide optimum EMI performance. The converter can output 1.2A or more depending on input voltage (see Figure 3 in the user guide for the Maximum Output Current vs V_IN curve). When placed in shutdown, the converter has very low quiescent current, ideal in automotive and other battery-powered applications. PULSE SKIP and BURST modes are selectable with jumper JP1. Each user-selectable option enables low quiescent current at light load and can also be combined with SSFM operation using JP1.

The LT8337-1 boost converter IC operates over an input range of 2.7V to 28V, suitable for automotive, telecom and industrial applications. It exhibits a low quiescent current of 23μA, making it ideal for battery-operated systems. The converter provides adjustable and synchronizable operation from 300kHz to 3MHz with SSFM option. At light load, either PULSE SKIP or low-ripple BURST mode can be selected to improve the efficiency. The LT8337-1 packs popular features such as soft-start, input undervoltage lockout, adjustable switching frequency and clock synchronization. The V_C pin grants easy accessibility to change loop compensation to complement most applications.

The LT8337-1 comes in a small 16-lead plastic LQFN package for optimal size and emissions. The LT8337-1 data sheet gives a complete description of the part, pins, features, operation, and application information. The data sheet must be read in conjunction with this demo manual for EVAL-LT8337-1-AZ.

Resources

EVAL-LT8337-AZ

View Detailed Evaluation Kit Information

Evaluation circuit EVAL-LT8337-AZ features the LT8337 as a 2MHz low I_Q, synchronous boost converter with a 12V output from 4.5V to 12V input. When V_IN goes above the 12V output regulation setpoint, the LT8337 smoothly transitions between regulation and PassThru™ mode. This evaluation circuit features Spread Spectrum Frequency Modulation (SSFM), Silent Switcher® technology, and EMI filters to provide optimum EMI performance. The converter can output 1.2A or more depending on input voltage (see Figure 3 for the Maximum Output Current vs V_IN curve). When placed in shutdown, the converter has very low quiescent current, ideal in automotive and other battery-powered applications. PULSE SKIP and BURST modes are selectable with jumper JP1. Each user-selectable option enables low quiescent current at light load and can also be combined with SSFM operation using JP1.

The LT8337 boost converter IC operates over an input range of 2.7V to 28V, suitable for automotive, telecom and industrial applications. It exhibits a low quiescent current of 4μA, making it ideal for battery-operated systems. The converter provides adjustable and synchronizable operation from 300kHz to 3MHz with SSFM option. At light load, either PULSE SKIP or low-ripple BURST mode can be selected to improve the efficiency. The LT8337 packs popular features such as soft-start, input undervoltage lockout, adjustable switching frequency and clock synchronization. The Power Good (PG) flag indicates when the output voltage is in regulation.

The LT8337 comes in a small 16-lead plastic LQFN package for optimal size and emissions. The LT8337 data sheet gives a complete description of the part, pins, features, operation, and application information. The data sheet must be read in conjunction with the demo manual for EVAL-LT8337-AZ.

Resources

Documentation & Resources

Data Sheets

LT8337/LT8337-1: 28V, 5A Low I_Q Synchronous Step-Up Silent Switcher with PassThru Data Sheet (Rev. 0)
5/18/2021

PDF

1 M

Reliability Data

R570 Reliability Data
3/23/2018

PDF

415 K

User Guides

EVAL-LT8337-1-AZ - Demo Manual (Rev. 0)
6/23/2021

PDF

1 M
EVAL-LT8337-AZ - Demo Manual (Rev. 0)
5/20/2021

PDF

1 M

Technical Articles

Voltage Conversion at Low Energy Levels
12/1/2021
PassThru of a Voltage Using Buck-Boost Regulators
11/1/2021

Tools & Simulations

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.

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.

LTspice downloads and documentation

LTspice Simulations

LT8337-1 - 28V, 5A Low IQ Synchronous Step-Up Silent Switcher with PassThru and Vc Pin. Input: 2.7V to 28V, Output: 12V @ 1.33A, Fsw = 2MHz

LT8337 - 28V, 5A Low IQ Synchronous Step-Up Silent Switcher with PassThru. Input: 2.7V to 28V, Output: 12V @ 1.33A, Fsw = 2MHz.

Models for the following parts are available in LTspice:

LT8337

LT8337-1

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.

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 download and documentation

LTpowerCAD Project Files

LT8337 Project - EVAL-LT8337-AZ 4.5-10Vin, 12, 1.35A, 2MHz

LT8337-1 Project - EVAL-LT8337-1-AZ 4.5-10Vin, 12, 1.35A, 2MHz

Design tools for the following parts are available in LTpowerCAD:

LT8337

LT8337-1

Design Resources

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 Number	Material Declaration	Reliability Data	Pin/Package Drawing	CAD Symbols, Footprints & 3D Models
LT8337EV#PBF	Material Declaration	Reliability Data	16-Lead LQFN Package	Ultra Librarian SamacSys
LT8337EV-1#PBF	Material Declaration	Reliability Data	16-Lead LQFN Package	Ultra Librarian SamacSys
LT8337JV#PBF	Material Declaration	Reliability Data	16-Lead LQFN Package	Ultra Librarian SamacSys
LT8337JV-1#PBF	Material Declaration	Reliability Data	16-Lead LQFN Package	Ultra Librarian SamacSys
Wafer Fabrication Data		R570 Reliability Data

Request Product/Process Change Notifications

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Support & Discussions

LT8337 Discussions

RE: LTpowerCAD II with LT8337

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Evaluation Boards

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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.