IC manufacturers Texas Instruments

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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

TopologyBuck Converter
Input voltage5-20 V
Output 13.3 V / 1.2 A
IC revisionA

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

Products

Order Code Data­sheet Simu­lation Downloads Status Product seriesL
(µH)
IRP,40K
(A)
ISAT,10%
(A)
ISAT,30%
(A)
RDC max.
(mΩ)
fres
(MHz)
MountCVR
(V (DC))
Endurance
(h)
Operating TemperatureIRIPPLE
(mA)
Z
(mΩ)
ILeak
(µA)
DF
(%)
Ø D
(mm)
L
(mm)
Packaging Samples
74437349150SPEC

PCN pending

Due to a pending PCN there will be a new datasheet revision issued for this order code soon. Please find the actual as well based on valid PCN date the new revision datasheet below. If you have further questions please get in contact with our sales staff.

8 files Active i| Production is active. Expected lifetime: >10 years.WE-LHMI SMT Power Inductor 15 3.6 3.5 7.2 92 10 SMT 7.3
74437324220SPEC

PCN pending

Due to a pending PCN there will be a new datasheet revision issued for this order code soon. Please find the actual as well based on valid PCN date the new revision datasheet below. If you have further questions please get in contact with our sales staff.

8 files Active i| Production is active. Expected lifetime: >10 years.WE-LHMI SMT Power Inductor 22 1.3 1.45 2.35 500 14 SMT -40 °C up to +125 °C 4.45
865060457009SPEC
8 files Active i| Production is active. Expected lifetime: >10 years.WCAP-ASLL Aluminum Electrolytic Capacitors V-Chip SMT470 µF 25 5000 -55 °C up to +105 °C 670 90 117.5 14 10 10.5 15" Tape & Reel
Order Code Data­sheet Simu­lation
74437349150SPEC

PCN pending

Due to a pending PCN there will be a new datasheet revision issued for this order code soon. Please find the actual as well based on valid PCN date the new revision datasheet below. If you have further questions please get in contact with our sales staff.

74437324220SPEC

PCN pending

Due to a pending PCN there will be a new datasheet revision issued for this order code soon. Please find the actual as well based on valid PCN date the new revision datasheet below. If you have further questions please get in contact with our sales staff.

865060457009SPEC
Samples
Order Code Data­sheet Simu­lation Downloads Status Product seriesL
(µH)
IRP,40K
(A)
ISAT,10%
(A)
ISAT,30%
(A)
RDC max.
(mΩ)
fres
(MHz)
MountCVR
(V (DC))
Endurance
(h)
Operating TemperatureIRIPPLE
(mA)
Z
(mΩ)
ILeak
(µA)
DF
(%)
Ø D
(mm)
L
(mm)
Packaging Samples