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8 to 50 V input range
Integrated DMOS switch
Adjustable fixed off-time
Highly efficient
Adjustable 1.2 to 24 V output
Description
The A8499 is a step down regulator that will handle a wide
input operating voltage range.
The A8499 is supplied in a low-profile 8-lead SOIC with
exposed pad (package LJ).
Applications include:
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Printer power supplies
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Consumer equipment power supplies
Package: 8-Lead SOIC with exposed
thermal pad (suffix LJ)
Approximate Scale 1:1
Typical Application
+42 V
Efficiency vs. Output Current
CBOOT
0.01
渭F
C3
100
渭F
50 V
BOOT
VIN
C3
0.22
渭F
ENB
LX
A8499
TSET
RTSET
L1
47
渭H
VOUT
3.3 V / 1.2 A
VBIAS
R1
17.8 k惟
121 k惟
GND
FB
D1
ESR
R2
10.2 k惟
COUT
220
渭F
10 V
90.0
88.0
86.0
84.0
82.0
80.0
78.0
76.0
74.0
72.0
70.0
0
200
400
600
800
1000
Efficiency %
V
OUT
(V)
3.3
5
1200
1400
I
OUT
(mA)
Circuit for 42 V step down to 3.3 V at 1.2 A. Efficiency data from circuit shown in left panel.Data is for reference only.
A8499-DS, Rev. 3
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