A8698
Wide Input Voltage 3.0 A Step Down Regulator
Application Circuit
Circuit with Low ESR Capacitor
fSW = 500 kHz nominal at 12 V
Efficiency versus Load Current
Stabilized with low ESR capacitor
100
90
80
70
60
50
40
30
20
10
VIN
12 to 16.4 V
CBOOT
0.01 μF
CIN
22 μF
VIN
LX
BOOT
ENB
VOUT
5V /2.5 A
L
10 μH
A8698
COUT
D1
120 μF
TSET
GND
VBIAS
FB
R3
1MΩ
mΩ
18
RTSET
16.4 kΩ
R1
6.34 kΩ
Ratings:
R2
100 pF
L: CDRH104R-100NC
COUT: EEFUD0J121R
CIN: ECJ-4YB1E226M
1.2 kΩ
0
0
0.5
1.0
1.5
2.0
2.5
3.0
Load Current (A)
Evaluation Board
Silkscreen Layer
Bottom Layer
J1
8 to 24 Vdc
C1.2
C1.3
C1.1
J2
GND
C3
C2
J4
GND
C4.2
C4.1
BOOT
ENB
VIN
LX
J3
R4
R3
L1
3.3 V / 3.0 A
A8698
VOUT
C4.3
D1
TSET
GND
VBIAS
FB
EN
PAD
R2
R1
R5
P1
Top and Silkscreen Layers
Allegro MicroSystems, Inc.
115 Northeast Cutoff, Box 15036
10
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com
ALLEGRO [ ALLEGRO MICROSYSTEMS ]
