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Analog Devices LT8338 | Demoboard DC2907A
40V, 1.2A Micropower Synchronous Boost Converter with PassThru
Details
| Topologie | Abwärtswandler |
| Eingangsspannung | 4-16 V |
| Ausgang 1 | 24 V / 0.46 A |
Beschreibung
Demonstration circuit DC2907A features the LT8338, a low IQ, Synchronous Boost Converter in a thermally enhanced 10-lead plastic MSOP package. DC2907A is designed to convert a 4V to 16V source to 24V output, with up to 460mA of load current, depending on the input voltage. It was designed with a switching frequency of 2.2MHz. DC2907A contains a selectable jumper, JP1, to aid in the selection of any of the five modes of operation. The default setting is Burst mode.This converter features Spread Spectrum Frequency Modulation, SSFM. The input and output filters installed on the PCB help suppress EMI noise, but the use of SSFM makes it easier to pass CISPR25 class 5 conducted and radiated emissions testing for automotive vehicles. To perform an EMI evaluation for this converter include the input filter by connecting the input source to the VEMI terminal and select the Burst+SSFM JP1 setting.EMI filters may not be necessary for all applications. For a lower parts count and BOM cost EMI filters can be removed. To do so, replace FB1 and FB2 with a zero ohm jumpers and remove all input and output filter components located inside the dashed-line rectangles on the schematic, plus C1 and C13.Proper board layout is essential for maximum thermal performance. See the datasheet section “Thermal Considerations”.The Performance Summary section details the ratings of the DC2907A at room temperature. The LT8338 datasheet gives a complete description of the part, operation and application information. The data sheet must be read in conjunction with this quick start guide for DC2907A.The LT8338 is available in a thermally-enhanced 10 lead plastic MSOP package.
Eigenschaften
- Wide Input Voltage Range: 3.0V to 40V
- Low Quiescent Current in Burst Mode® Operation
- <6μA IQ
- <20mVP-P Output Ripple
- Synchronous Operation for High Efficiency
- Monolithic 40V, 240mΩ Power Switches
- 100% Duty Cycle PassThru™ Mode for Boost Preregulation Applications
- Adjustable and Synchronizable: 300kHz to 3MHz
- Spread Spectrum for Reduced EMI/EMC Emissions
- Accurate EN/UVLO
- Internal Compensation
- 20MΩ Internal Feedback Divider
- Output Voltage Up to 40V
- Available in 10-Lead MSOP Package
- AEC-Q100 Automotive Qualification in Progress
Typische Anwendungen
- Industrial and Automotive Power Supplies, Battery-Powered Systems, General Purpose Step-Up
Weiterführende Informationen
Artikeldaten
Artikel Nr. | Datenblatt | Simulation | Downloads | Status | Produktserie | L(µH) | IRP,40K(A) | ISAT,30%(A) | RDC typ.(mΩ) | fres(MHz) | VOP(V) | Z @ 100 MHz(Ω) | Zmax(Ω) | Testbedingung Zmax | IR 2(mA) | RDC max.(mΩ) | Typ | Pins | Montageart | L(mm) | H(mm) | IR(A) | Arbeitsspannung(V (AC)) | Betriebstemperatur | Muster | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
 | WE-MAPI SMT-Speicherdrossel, 4.7 µH, 2.4 A | Status Aktivi| Produktion ist aktiv. Erwartete Lebenszeit: >10 Jahre. | ProduktserieWE-MAPI SMT-Speicherdrossel | Induktivität4.7 µH | Performance Nennstrom2.4 A | Sättigungsstrom @ 30%5.15 A | Gleichstromwiderstand137 mΩ | Eigenresonanzfrequenz30 MHz | Betriebsspannung80 V | – | – | – | – | Gleichstromwiderstand158 mΩ | – | Pins2 | MontageartSMT | Länge3 mm | Höhe2 mm | Nennstrom1.9 A | – | Betriebstemperatur -40 up to +125 | ||||
 | WE-CBF SMT-Ferrit, –, – | Status Aktivi| Produktion ist aktiv. Erwartete Lebenszeit: >10 Jahre. | ProduktserieWE-CBF SMT-Ferrit | – | – | – | – | – | – | Impedanz @ 100 MHz600 Ω | Maximale Impedanz700 Ω | Maximale Impedanz150 MHz | Nennstrom 22000 mA | Gleichstromwiderstand150 mΩ | TypHochstrom | – | MontageartSMT | Länge2 mm | Höhe0.0009 mm | Nennstrom1.5 A | – | Betriebstemperatur -55 °C up to +125 °C | ||||
 | WR-PHD Stiftleisten, –, – | Simulation– | Status Aktivi| Produktion ist aktiv. Erwartete Lebenszeit: >10 Jahre. | ProduktserieWR-PHD Stiftleisten | – | – | – | – | – | – | – | – | – | – | – | TypGerade | Pins10 | MontageartTHT | Länge10 mm | – | Nennstrom2 A | Arbeitsspannung200 V (AC) | Betriebstemperatur -40 °C up to +105 °C | |||
 | WR-PHD Kurzschlussbrücken, –, – | Simulation– | Status Aktivi| Produktion ist aktiv. Erwartete Lebenszeit: >10 Jahre. | ProduktserieWR-PHD Kurzschlussbrücken | – | – | – | – | – | – | – | – | – | – | – | – | Pins2 | – | – | – | Nennstrom3 A | Arbeitsspannung200 V (AC) | Betriebstemperatur -25 °C up to +105 °C |