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Analog Devices LT8334 | Demoboard EVAL-LT8334-AZ
Low IQ Boost/SEPIC/Inverting Converter with 5A, 40V Switch
Overview
| Topology | SEPIC Buck-Boost Topology |
| Input voltage | 3-26 V |
| Switching frequency | 300-2000 kHz |
| Output 1 | 12 V / 2.2 A |
Description
Evaluation circuit EVAL-LT8334-AZ features the LT8334 in a SEPIC configuration. It operates with a switching frequency of 2MHz and is designed to convert a 3V to 26V source to 12V output. The converter can output up to 2.2A depending on the input voltage (see Figure 3 in the user guide for the maximum output current vs VIN curve).This evaluation circuit features Spread Spectrum Frequency Modulation (SSFM), EMI filters, and space for an option EMI shield 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 SKIP or low-ripple BURST mode can be selected to improve the efficiency.The LT8334 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 LT8334 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 LT8334 is assembled in a thermally enhanced 12-lead 4mm × 3mm DFN package.The data sheet gives a complete description of the device, operation, and applications information. The data sheet must be read in conjunction with the demo manual for EVAL-LT8334-AZ.
Features
- Wide Input Voltage Range: 2.8V to 40V
- Ultralow Quiescent Current and Low Ripple Burst-Mode® Operation: IQ = 9μA
- 5A, 40V Power Switch
- Positive or Negative Output Voltage Programming with a Single Feedback Pin
- Programmable Frequency (300kHz to 2MHz)
- Sychronizable 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 12-Lead 4mm × 3mm DFN
Typical applications
- Telecom
- Medical Diagnostic Equipment
- Portable Electronics
- Industrial and Automotive
More information
Products
Order Code | Datasheet | Simulation | Downloads | Status | Product series | L(mm) | W(mm) | H(mm) | Mount | Plating | t(mm) | Core Material | Base Material | Z @ 100 MHz(Ω) | Zmax(Ω) | Test Condition Zmax | IR 2(mA) | RDC max.(Ω) | Type | Samples | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
 | WE-CBF SMT EMI Suppression Ferrite Bead, 4.5 mm, 3.2 mm | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-CBF SMT EMI Suppression Ferrite Bead | Length4.5 mm | Width3.2 mm | Height1.5 mm | MountSMT | – | – | – | – | Impedance @ 100 MHz785 Ω | Maximum Impedance1300 Ω | Maximum Impedance60 MHz | Rated Current 23000 mA | DC Resistance0.05 Ω | TypeHigh Current | ||||
| WE-CBF SMT EMI Suppression Ferrite Bead, 4.5 mm, 3.2 mm | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-CBF SMT EMI Suppression Ferrite Bead | Length4.5 mm | Width3.2 mm | Height1.5 mm | MountSMT | – | – | – | – | Impedance @ 100 MHz880 Ω | Maximum Impedance940 Ω | Maximum Impedance108 MHz | Rated Current 24000 mA | DC Resistance0.035 Ω | TypeHigh Current | ||||
 | Shielding Cabinet Clip, 6.5 mm, 0.8 mm | Simulation– | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesShielding Cabinet Clip | Length6.5 mm | Width0.8 mm | Height1.27 mm | MountSMT | PlatingTin | Material Thickness0.15 mm | – | Base MaterialSteel | – | – | – | – | – | TypeClip | |||
 | WE-SHC Shielding Cabinet, 31.6 mm, 31.6 mm | Simulation– | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-SHC Shielding Cabinet | Length31.6 mm | Width31.6 mm | Height5.8 mm | MountSMT | PlatingTin | Material Thickness0.2 mm | Core MaterialSteel | Base MaterialTin plate | – | – | – | – | – | TypeOne Piece Cover |