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Overview
| Topology | Boost Converter |
| Input voltage | 10-40 V |
| Switching frequency | 360-430 kHz |
| Output 1 | 48 V / 2 A |
Description
Demonstration circuit 2937A features the LT®8357 as a 360kHz low IQ, high power boost converter with a 48V output from 10V to 40V input. This demonstration circuit features spread spectrum frequency modulation (SSFM) and split gate driver pins for the high power,high voltage switch. The converter can output 2A and higher (see Figure 3). When placed in shutdown, the converter has very low quiescent current, ideal in automotive and other battery-powered applications. Low quiescent current can be achieved with both pulse-skipping and Burst Mode® operation as jumper selections on this demonstration circuit.The LT8357 boost controller IC operates over an input range of 3V to 60V, suitable for automotive, telecom and industrial applications. It also exhibits a low quiescent current of 8μA, making it ideal for battery-operated All registered trademarks and trademarks are the property of their respective owners.systems. It drives a low side N-channel power MOSFET with a 5V split gate drive. The controller provides adjustable and synchronizable operation from 100kHz to 2MHz.At light load, either pulse-skipping or low-ripple Burst Mode operation can be selected to improve the efficiency.It also packs many popular features such as soft-start, input undervoltage lockout, adjustable frequency and clock synchronization. PGOOD indicates when the output voltage is in regulation.The LT8357 comes in a thermally enhanced 12-lead plastic MSE package. The LT8357 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 DC2937A.
Features
- Wide Input Voltage Range: 3V to 60V
- Low IQ Burst Mode® Operation:8µA
- Up to 95% Efficiency at 2MHz
- ±1.5% Internal 1V Voltage Reference
- 5V Split Gate Drive for Efficiency and EMI Optimization
- 100kHz to 2MHz Fixed Switching Frequency with External Clock Synchronization
- Spread Spectrum Frequency Modulation for Low EMI --Accurate Enable Threshold with Hysteresis
- Programmable Output Soft-Start and Tracking
- Thermally-Enhanced 12-Lead MSOP Package
Typical applications
- Battery-Powered Systems
- Portable Electronic Equipment
- Automotive and Industrial Systems
More information
Products
Order Code | Datasheet | Simulation | Downloads | Status | Product series | L(µH) | IRP,40K(A) | ISAT,10%(A) | ISAT,30%(A) | RDC max.(mΩ) | fres(MHz) | Wire Type | Pins | Type | Mount | L(mm) | H(mm) | IR(A) | Working Voltage(V (AC)) | Operating Temperature | Samples | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
 | WE-HCF SMT High Current Inductor, 4.2 µH, 27 A | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-HCF SMT High Current Inductor | Inductance4.2 µH | Performance Rated Current27 A | Saturation Current @ 10%34 A | Saturation Current @ 30%38 A | DC Resistance3.34 mΩ | Self Resonant Frequency24 MHz | Wire TypeFlat | Pins2 | – | MountSMT | Length20.8 mm | Height13.5 mm | Rated Current24 A | – | Operating Temperature -40 °C up to +125 °C | ||||
 | WR-PHD Pin Header, –, – | Simulation– | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWR-PHD Pin Header | – | – | – | – | – | – | – | Pins10 | TypeStraight | MountTHT | Length10 mm | – | Rated Current2 A | Working Voltage200 V (AC) | Operating Temperature -40 °C up to +105 °C | |||
 | WR-PHD Jumper, –, – | Simulation– | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWR-PHD Jumper | – | – | – | – | – | – | – | Pins2 | – | – | – | – | Rated Current3 A | Working Voltage200 V (AC) | Operating Temperature -25 °C up to +105 °C | |||
 | WR-PHD Pin Header, –, – | Simulation– | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWR-PHD Pin Header | – | – | – | – | – | – | – | Pins3 | TypeStraight | MountTHT | Length6 mm | – | Rated Current2 A | Working Voltage200 V (AC) | Operating Temperature -40 °C up to +105 °C |