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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 | Boost Converter |
| Input voltage | 10 V |
| Output 1 | 20 V / 0.1 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 | 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) | Operating Temperature | IRIPPLE (mA) | Z (mΩ) | ILeak (µA) | DF (%) | Ø D (mm) | L (mm) | Packaging | Samples | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
 | 74437349150 | SPEC | 8 files | WE-LHMI SMT Power Inductor | 15 | 3.6 | 3.5 | 7.2 | 92 | 10 | SMT | – | – | – | – | – | – | – | – | – | 7.3 | – | ||
| 74437324220 | SPEC | 8 files | WE-LHMI SMT Power Inductor | 22 | 1.3 | 1.45 | 2.35 | 500 | 14 | SMT | – | – | – | -40 °C up to +125 °C | – | – | – | – | – | 4.45 | – | ||
 | 865060457009 | SPEC | 8 files | WCAP-ASLL Aluminum Electrolytic Capacitors | – | – | – | – | – | – | V-Chip SMT | 470 µF | 25 | 5000 | -55 °C up to +105 °C | 670 | 90 | 117.5 | 14 | 10 | 10.5 | 15" Tape & Reel |
| Order Code | Datasheet | Simulation | |
|---|---|---|---|
| 74437349150 | SPEC | |
| 74437324220 | SPEC | |
| 865060457009 | SPEC |
| Samples |
|---|
| Order Code | Datasheet | Simulation | Downloads | 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) | Operating Temperature | IRIPPLE (mA) | Z (mΩ) | ILeak (µA) | DF (%) | Ø D (mm) | L (mm) | Packaging | Samples |
|---|