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A8498 Datasheet

  • A8498

  • Wide Input Voltage 3.0 A Step Down Regulator

  • 333.11KB

  • 9頁

  • ALLEGRO   ALLEGRO

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A8498
Wide Input Voltage 3.0 A Step Down Regulator
Features and Benefits
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8 to 50 V input range
Integrated DMOS switch
Adjustable fixed off-time
Highly efficient
Adjustable 0.8 to 24 V output
Description
The A8498 is a step down regulator that will handle a wide
input operating voltage range.
The A8498 is supplied in a low-profile 8-lead SOIC with
exposed pad (package LJ). Applications include:
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Applications with 8 to 50 V input voltage range needing
buck regulator for 3.0 A output current
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Consumer equipment power
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Uninterruptible power supplies (lead acid battery
charger)
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Automotive telematics: 9 to 16 V input, with higher
voltage protection
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12 V lighter-powered applications (portable DVD, etc.)
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Point of Sale (POS) applications
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Industrial applications with 24 or 36 V bus
Package: 8-Lead SOIC with exposed
thermal pad (suffix LJ)
Approximate Scale 1:1
Typical Application
+42
V
CBOOT
0.01
渭F
CIN2
220
渭F
50 V
BOOT
VIN
CIN1
0.22
渭F
Efficiency vs. Output Current
90.0
88.0
86.0
84.0
82.0
80.0
78.0
76.0
74.0
72.0
70.0
0
500
1000
1500
2000
ENB
A8498
TSET
RTSET
63.4 k
GND
LX
L1
68
渭H
VOUT
3.3 V / 3 A
Efficiency %
VBIAS
R1
6.34 k
FB
D1
R2
2k
ESR
COUT
220
渭F
25 V
V
OUT
(V)
5
3.3
2500
3000
I
OUT
(mA)
Circuit for 42 V step down to 3.3 V at 3 A. Efficiency data from circuit shown in left panel. Data is for reference only.
A8498-DS, Rev. 2

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