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Texas Instruments LM20242 | Demoboard PMP4494
5V to 3.3V 1.2A DC-DC Converter with 200mS Vout Hold-up Time Circuit Reference Design
Details
| Topologie | Abwärtswandler |
| Eingangsspannung | 5-20 V |
| Ausgang 1 | 3.3 V / 1.2 A |
| IC-Revision | A |
Beschreibung
The PMP4494 is a 5V to 3.3V 1.2A DC-DC converter with a Vout hold-up circuit. The synchronous buck converter LM20242 is used in the design to provide high efficiency for the system voltage. A boost converter TPS61170 boosts an auxiliary rail from 10V up to 20V to provide the backup voltage. A supply voltage supervisor TLV809 monitors the system voltage and switches the supply to the backup voltage once the system voltage falls below the threshold voltage. Along with the boost circuit, the hold-up capacitance is significantly reduced while still meeting the 200mS hold-up time specification.
Eigenschaften
- Main power supply 5V to 3.3V 1.2A output synchronous buck
- Back-up power supply boost up from 10Vin to 20V hold-up voltage
- Minimum 200ms hold-up time for 3.3V
- Bus voltage monitor and switch
- Size: 73.5mm x 50mm x 10mm
Typische Anwendungen
- Battery charger
Weiterführende Informationen
Artikeldaten
Artikel Nr. | Datenblatt | Simulation | Downloads | Status | Produktserie | L(µH) | IRP,40K(A) | ISAT,10%(A) | ISAT,30%(A) | RDC max.(mΩ) | fres(MHz) | Montageart | C | VR(V (DC)) | Endurance(h) | IRIPPLE(mA) | Z(mΩ) | ILeak(µA) | DF(%) | Ø D(mm) | L(mm) | Verpackung | Muster | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
 | WE-LHMI SMT Speicherdrossel, 15 µH, 3.6 A | Status Aktivi| Produktion ist aktiv. Erwartete Lebenszeit: >10 Jahre. | ProduktserieWE-LHMI SMT Speicherdrossel | Induktivität15 µH | Performance Nennstrom3.6 A | Sättigungsstrom 13.5 A | Sättigungsstrom @ 30%7.2 A | Gleichstromwiderstand92 mΩ | Eigenresonanzfrequenz10 MHz | MontageartSMT | – | – | – | – | – | – | – | – | Länge7.3 mm | – | ||||
| WE-LHMI SMT Speicherdrossel, 22 µH, 1.3 A | Status Aktivi| Produktion ist aktiv. Erwartete Lebenszeit: >10 Jahre. | ProduktserieWE-LHMI SMT Speicherdrossel | Induktivität22 µH | Performance Nennstrom1.3 A | Sättigungsstrom 11.45 A | Sättigungsstrom @ 30%2.35 A | Gleichstromwiderstand500 mΩ | Eigenresonanzfrequenz14 MHz | MontageartSMT | – | – | – | – | – | – | – | – | Länge4.45 mm | – | ||||
 | WCAP-ASLL Aluminium-Elektrolytkondensatoren, –, – | Status Aktivi| Produktion ist aktiv. Erwartete Lebenszeit: >10 Jahre. | ProduktserieWCAP-ASLL Aluminium-Elektrolytkondensatoren | – | – | – | – | – | – | MontageartV-Chip SMT | Kapazität470 µF | Nennspannung25 V (DC) | Endurance 5000 | Rippelstrom670 mA | Impedanz90 mΩ | Leckstrom117.5 µA | Verlustfaktor14 % | Durchmesser10 mm | Länge10.5 mm | Verpackung15" Tape & Reel |