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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
Overview
| Topology | Buck Converter |
| Input voltage | 5-20 V |
| Output 1 | 3.3 V / 1.2 A |
| IC revision | A |
Description
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.
Features
- 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
Typical applications
- Battery charger
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) | Mount | C | VR(V (DC)) | Endurance(h) | IRIPPLE(mA) | Z(mΩ) | ILeak(µA) | DF(%) | Ø D(mm) | L(mm) | Packaging | Samples | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
 | WE-LHMI SMT Power Inductor, 15 µH, 3.6 A | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-LHMI SMT Power Inductor | Inductance15 µH | Performance Rated Current3.6 A | Saturation Current @ 10%3.5 A | Saturation Current @ 30%7.2 A | DC Resistance92 mΩ | Self Resonant Frequency10 MHz | MountSMT | – | – | – | – | – | – | – | – | Length7.3 mm | – | ||||
| WE-LHMI SMT Power Inductor, 22 µH, 1.3 A | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-LHMI SMT Power Inductor | Inductance22 µH | Performance Rated Current1.3 A | Saturation Current @ 10%1.45 A | Saturation Current @ 30%2.35 A | DC Resistance500 mΩ | Self Resonant Frequency14 MHz | MountSMT | – | – | – | – | – | – | – | – | Length4.45 mm | – | ||||
 | WCAP-ASLL Aluminum Electrolytic Capacitors, –, – | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWCAP-ASLL Aluminum Electrolytic Capacitors | – | – | – | – | – | – | MountV-Chip SMT | Capacitance470 µF | Rated Voltage25 V (DC) | Endurance 5000 | Ripple Current670 mA | Impedance90 mΩ | Leakage Current117.5 µA | Dissipation Factor14 % | Diameter10 mm | Length10.5 mm | Packaging15" Tape & Reel |