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A4490EESTR-T Datasheet(PDF) 4 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) 4 Page - Allegro MicroSystems

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Triple Output Step-Down Switching Regulator
A4490
4
Allegro MicroSystems, Inc.
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
Terminal List
Number
Name
Function
1
FB1
Feedback REG1
2
VDD
Bias supply
3
GND1
Ground
4
FB2
Feedback REG2
5
ENB2
Enable REG2, logic input, active high
6
LX2
Switch node REG2
7
VBB22
Input supply for REG2
8
CPOR
POR delay adjustment
9
PORZ
Power on reset output, active low
10
VCP
Charge pump reservoir
11
CP2
Charge pump capacitor terminal
12
CP1
Charge pump capacitor terminal
13
PGND1
Ground for charge pump circuitry
14
FB3
Feedback REG3
15
ENB3
Enable REG3, logic input, active high
16
LX3
Switch node REG3
17
VBB32
Input supply for REG3
18
VBB12
Input supply for REG1
19
LX1
Switch node REG1
20
ENB1
Enable REG1, logic input, active high
–PAD3
Exposed pad for enhanced thermal dissipation
1GND and PGND should be connected externally.
2The three VBBx pins should be connected together externally.
3Thermal pad should be connected to the ground (0 V) plane using thermal vias.
PAD
15
14
13
12
11
1
2
3
4
5
ENB3
FB3
PGND
CP1
CP2
FB1
VDD
GND
FB2
ENB2
Pin-out Diagram


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