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A8499 Datasheet(PDF) 6 Page - Allegro MicroSystems

No. de Pieza. A8499
Descripción  High Voltage Step-Down Regulator
Descarga  7 Pages
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Fabricante  ALLEGRO [Allegro MicroSystems]
Página de inicio  http://www.allegromicro.com
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A8499 Datasheet(HTML) 6 Page - Allegro MicroSystems

   
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High Voltage Step-Down Regulator
A8499
6
Allegro MicroSystems, Inc.
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com
A 8499
BOOT
ENB
TSET
GND
VIN
LX
VBIAS
FB
47 μH
C1
L1
22 μF/ 25 V
RTSET
30.1 k
Ω
R1
10 k
Ω
R2
3.16 k
Ω
COUT
330 μF/ 6.3 V
(Aluminum)
+12 V
VOUT
5.0 V / 1.8 A
D1
B340
C2
0.1 μF
CBOOT
0.01 μF
12 V step down to 5.0 V at 1.8 A
Pin Name
Pin Description
Pin Number
BOOT
Gate drive boost node
1
ENB
On/off control logic input
2
TSET
Off-time setting
3
GND
Ground
4
NC
No connect
N/A
NC
No connect
N/A
FB
Feedback for adjustable regulator
5
VBIAS
Bias supply input
6
LX
Buck switching node
7
VIN
Supply input
8
Pad
Exposed pad for thermal dissipation
Pad
Terminal List Table
Typical Application Circuit
1
2
3
4
8
7
6
5
BOOT
ENB
TSET
GND
VIN
LX
VBIAS
FB
Pad
Pin-out Diagram
RTSET (k )
Violation of
Minimum On-Time
Safe Operating Area
Minimum
V
alue
of
R
TSET
13.0
12.5
12.0
11.5
11.0
10.5
10.0
9.5
9.0
8.5
8.0
7.5
7.0
6.5
6.0
5.5
5.0
4.5
4.0
3.5
3.0
2.5
2.0
RTSET Value versus VIN /VOUT


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