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A4490EESTR-T Datasheet(PDF) 2 Page - Allegro MicroSystems

Part # A4490EESTR-T
Description  Triple Output Step-Down Switching Regulator
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Manufacturer  ALLEGRO [Allegro MicroSystems]
Direct Link  http://www.allegromicro.com
Logo ALLEGRO - Allegro MicroSystems

A4490EESTR-T Datasheet(HTML) 2 Page - Allegro MicroSystems

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Triple Output Step-Down Switching Regulator
A4490
2
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
The A4490 is provided in a 20-contact, 4 mm × 4 mm, 0.75 mm
nominal overall height QFN, with exposed pad for enhanced thermal
dissipation. It is lead (Pb) free, with 100% matte tin leadframe
plating.
Applications include the following:
▪ Photo, inkjet, and portable printers
▪ Industrial
▪ Hand-held devices
▪Portable applications
Description (continued)
Selection Guide
Part Number
Packing
Operating Temperature Range
(°C)
A4490EESTR-T
1500 pieces per 7-in. reel
–40 to 85
Thermal Characteristics may require derating at maximum conditions, see application information
Characteristic
Symbol
Test Conditions*
Value Units
Package Thermal Resistance
RθJA
On 4-layer PCB based on JEDEC standard
37
ºC/W
*Additional thermal information available on the Allegro website.
Absolute Maximum Ratings (reference to GND)
Characteristic
Symbol
Notes
Rating
Units
Load Supply Voltage
VBB
36
V
LX1, LX2, and LX3 Pins
VLXn
–1 to 36
V
PORZ and VDD Pins
VIN
–0.3 to 7
V
ENBx Pin Input Current
IENBx
Driven by a current-limited voltage source
1
mA
Operating Ambient Temperature
TA
Range E
–40 to 85
ºC
Maximum Junction Temperature
TJ(max)
150
ºC
Storage Temperature
Tstg
–55 to 150
ºC
Recommended Operating Conditions
Characteristic
Symbol
Conditions
Min.
Typ.
Max.
Units
Load Supply Voltage
VBB
To operate at VBB < 6 V, connect VDD
supply to the VBB supply. See Powering
Configurations section.
4.5
34
V
LX1, LX2, and LX3 Pins
VLXn
–0.7
34
V
Operating Ambient Temperature
TA
–40
85
ºC
Junction Temperature
TJ
–40
125
ºC


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