A8498 Datasheet, PDF (1/9 Pages) Allegro MicroSystems – Wide Input Voltage 3.0 A Step Down Regulator

A8498
Wide Input Voltage 3.0 A Step Down Regulator
Features and Benefits
▪ 8 to 50 V input range
▪ Integrated DMOS switch
▪ Adjustable fixed off-time
▪ Highly efficient
▪ Adjustable 0.8 to 24 V output
Package: 8-Lead SOIC with exposed
thermal pad (suffix LJ)
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:
▪ Applications with 8 to 50 V input voltage range needing
buck regulator for 3.0 A output current
▪ Consumer equipment power
▪ Uninterruptible power supplies (lead acid battery
charger)
▪ Automotive telematics: 9 to 16 V input, with higher
voltage protection
▪ 12 V lighter-powered applications (portable DVD, etc.)
▪ Point of Sale (POS) applications
▪ Industrial applications with 24 or 36 V bus
Approximate Scale 1:1
CBOOT
0.01 μF
BOOT
VIN
ENB
LX
A8498
RTSET
63.4 k7
TSET
GND
VBIAS
FB
D1
Typical Application
+42 V
CIN2
220 μF
50 V
CIN1
0.22 μF
L1
68 μH
R1
6.34 k7
R2
2 k7
VOUT
3.3 V / 3 A
ESR
COUT
220 μF
25 V
90.0
88.0
86.0
84.0
82.0
80.0
78.0
76.0
74.0
72.0
70.0
0
Efficiency vs. Output Current
VOUT (V)
5
3.3
500 1000 1500 2000 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