New Content (1)
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 VIN 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
The LT8337/LT8337-1 is a low IQ, 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 VIN pin quiescent current in Burst Mode operation, and 100% duty-cycle capability for the synchronous MOSFET in PassThru operation (VIN > VOUT) 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 VC pin for fast transient response. The LT8337 offers an output power good flag via the PG pin.
- Battery-Powered Systems
- General Purpose Step-Up
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 (1)
Evaluation circuit EVAL-LT8337-AZ features the LT8337 as a 2MHz low IQ, synchronous boost converter with a 12V output from 4.5V to 12V input. When VIN 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 VIN 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.
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.
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:
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.