AAT1151 Datasheet, PDF (14/16 Pages) Advanced Analogic Technologies – 850kHz 700mA Synchronous Buck DC/DC Converter

AAT1151
850kHz 700mA Synchronous Buck DC/DC Converter
AAT1151 Dissipation:
P_TOTAL
=
I_O2
·
(R_DSON(H)
·
V_O +
V_IN
R_DSON(L)
·
(V_IN
-V_O))
+ (t_sw · F · I_O + I_Q) · V_IN
(0.7A)² · (0.2Ω · 1.5V + 0.187Ω · (4.2V - 1.5V))
=
+ (20nsec · 850kHz · 0.7A + 0.3mA) · 4.2V = 0.145W
4.2V
T_J(MAX) = T_AMB + Θ_JA · P_LOSS = 85°C + 150°C/W · 0.145W = 107°C (MSOP-8)
= 85°C + 50°C/W · 0.145W = 92°C (QFN33-16)
Surface Mount Inductors
Manufacturer
TaiyoYuden
Toko
Sumida
Sumida
Sumida
MuRata
MuRata
MuRata
Part Number
NPO5DB4R7M
A914BYW-3R5M-D52LC
CDRH5D28-3R0
CDRH5D28-4R2
CDRH5D18-4R1
LQH55DN4R7M03
LQH66SN4R7M03
CDRH3D16-3R3
Value
4.7µH
3.5µH
3.0µH
4.2µH
4.1µH
4.7µH
4.7µH
3.3µH
Max DC
Current
1.4A
1.34A
2.4A
2.2A
1.95A
2.7A
2.2A
1.1A
DCR (Ω)
0.038
0.073
0.024
0.031
0.057
0.041
0.025
0.063
Size (mm)
L×W ×H
5.9 x 6.1 x 2.8
5.0 x 5.0 x 2.0
5.7 x 5.7 x 3.0
5.7 x 5.7 x 3.0
5.7 x 5.7 x 2.0
5.0 x 5.0 x 4.7
6.3 x 6.3 x 4.7
3.8 x 3.8 x 1.8
Type
Shielded
Shielded
Shielded
Shielded
Shielded
Non-Shielded
Shielded
Shielded
Surface Mount Capacitors
Manufacturer
MuRata
MuRata
MuRata
MuRata
Part Number
GRM40 X5R 106K 6.3
GRM42-6 X5R 106K 6.3
GRM21BR60J226ME39L
GRM21BR60J106ME39L
Value
10µF
10µF
22µF
10µF
Voltage
6.3V
6.3V
6.3V
6.3V
Temp. Co.
X5R
X5R
X5R
X5R
Case
0805
1206
0805
0805
14
1151.2005.11.1.4