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Analog Devices LT8333 | Demoboard EVAL-LT8333-BZ
LT8333 | Low IQ Boost/SEPIC Inverting Converter with 3A, 40V Switch
Overview
| Topology | Buck-Boost Converter |
| Input voltage | 4.5-20 V |
| Switching frequency | 300-2000 kHz |
| Output 1 | 24 V / 2 A |
Description
Evaluation circuit EVAL-LT8333-BZ features the LT8333 in a Boost configuration. It operates with a switching frequency of 2MHz and is designed to convert a 4.5V to 20V source to 24V output. The converter can output up to 2A depending on the input voltage (see Figure 3 in the demo manual, Maximum Output Current vs VIN curve).This evaluation circuit features Spread-Spectrum Frequency Modulation (SSFM) and EMI filters to provide optimum EMI performance. This PCB layout is optimized for good EMI performance and small solution size. The evaluation board contains a selectable jumper, JP1, to aid in the selection of the desired SYNC pin mode of operation. At light load, either pulse-skipping (PULSE SKIP) or low-ripple Burst Mode® operation (BURST) can be selected to improve the efficiency.The LT8333 boost/SEPIC/inverting converter IC operates over an input range of 2.8V to 40V, suitable for automotive, telecom, and industrial applications. The converter provides adjustable and synchronizable operation from 300kHz to 2MHz with SSFM option. The LT8333 packs other popular features such as soft-start, bias pin, input undervoltage lockout. The IC can exhibit a low quiescent current down to 9μA in BURST mode and 1μA in shutdown, which makes it ideal for battery-operated systems. The LT8333 is assembled in a thermally enhanced 10-lead 3mm × 3mm DFN package.
Features
- Wide Input Voltage Range: 2.8V to 40V
- Ultralow Quiescent Current and Low Ripple
- Burst Mode® Operation: IQ = 9μA
- 3A, 40V Power Switch
- Positive or Negative Output Voltage Programming with a Single Feedback Pin
- Programmable Frequency (300kHz to 2MHz)
- Synchronizable to an External Clock
- Spread Spectrum Frequency Modulation for Low EMI
- Bias Pin for Higher Efficiency
- Programmable Undervoltage Lockout (UVLO)
- Overcurrent and Overtemperature Protection
- Thermally Enhanced 10-Lead 3mm × 3mm DFN Package
Typical applications
- Portable Electronics
- Medical Diagnostic Equipment
- Industrial and Automotive
- Telecom
More information
Products
Order Code | Datasheet | Simulation | Downloads | Status | Product series | W(mm) | Plating | t(mm) | Core Material | Base Material | C | VR(V (DC)) | Endurance(h) | IRIPPLE(mA) | Z(mΩ) | ILeak(µA) | DF(%) | Ø D(mm) | Packaging | Z @ 100 MHz(Ω) | Zmax(Ω) | Test Condition Zmax | IR 2(mA) | RDC max.(Ω) | Type | Pins | Mount | L(mm) | H(mm) | IR(mA) | Working Voltage(V (AC)) | Operating Temperature | Samples | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
 | Shielding Cabinet Clip, 0.8 mm, Tin | Simulation– | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesShielding Cabinet Clip | Width0.8 mm | PlatingTin | Material Thickness0.15 mm | – | Base MaterialSteel | – | – | – | – | – | – | – | – | – | – | – | – | – | – | TypeClip | – | MountSMT | Length6.5 mm | Height1.27 mm | – | – | Operating Temperature -40 °C up to +125 °C | |||
 | WE-CBF SMT EMI Suppression Ferrite Bead, 1.2 mm, – | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-CBF SMT EMI Suppression Ferrite Bead | Width1.2 mm | – | – | – | – | – | – | – | – | – | – | – | – | – | Impedance @ 100 MHz600 Ω | Maximum Impedance700 Ω | Maximum Impedance150 MHz | Rated Current 22000 mA | DC Resistance0.15 Ω | TypeHigh Current | – | MountSMT | Length2 mm | Height0.0009 mm | Rated Current1500 mA | – | Operating Temperature -55 °C up to +125 °C | ||||
 | WCAP-ASLI Aluminum Electrolytic Capacitors, 6.6 mm, – | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWCAP-ASLI Aluminum Electrolytic Capacitors | Width6.6 mm | – | Material Thickness0.3 mm | – | – | Capacitance68 µF | Rated Voltage25 V (DC) | Endurance 2000 | Ripple Current240 mA | Impedance480 mΩ | Leakage Current17 µA | Dissipation Factor14 % | Diameter6.3 mm | Packaging15" Tape & Reel | – | – | – | – | – | – | – | MountV-Chip SMT | Length5.5 mm | – | – | – | Operating Temperature -55 °C up to +105 °C | ||||
 | WE-SHC Shielding Cabinet, 31.6 mm, Tin | Simulation– | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-SHC Shielding Cabinet | Width31.6 mm | PlatingTin | Material Thickness0.2 mm | Core MaterialSteel | Base MaterialTin plate | – | – | – | – | – | – | – | – | – | – | – | – | – | – | TypeOne Piece Cover | – | MountSMT | Length31.6 mm | Height5.8 mm | – | – | Operating Temperature -40 °C up to +125 °C | |||
 | WR-PHD Jumper, –, – | Simulation– | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWR-PHD Jumper | – | – | – | – | – | – | – | – | – | – | – | – | – | PackagingBag | – | – | – | – | – | – | Pins2 | – | – | – | Rated Current3000 mA | Working Voltage200 V (AC) | Operating Temperature -25 °C up to +105 °C |