AAT1121IES-0.6-T1 Advanced Analog Technology, Inc., AAT1121IES-0.6-T1 Datasheet - Page 16

• Manufacturer Part Number: AAT1121IES-0.6-T1
• Description: 1.5MHz, 250mA Step-Down Converter
• Manufacturer: Advanced Analog Technology, Inc.

Input Capacitor
Input Ripple V
AAT1121 Losses
C
I
P = esr · I
P
T
16
RMS
J(MAX)
TOTAL
IN
=
=
⎛
⎝
=
+ (t
=
+ (5ns · 1.5MHz · 0.2A + 30µA) · 4.2V = 26.14mW
= T
I
2
O
V
I
I
0.2
O
PP
O
= 0.1Arms
RMS
sw
AMB
2
· (R
· F · I
2
- ESR · 4 · F
2
· (0.59 Ω · 1.8V + 0.42Ω · [4.2V - 1.8V])
+ Θ
PP
= 5mΩ · (0.1A)
DSON(HS)
= 25mV
1
JA
O
⎞
⎠
+ I
· P
Q
LOSS
) · V
· V
S
O
= 85°C + (50°C/W) · 26.14mW = 86.3°C
IN
+ R
V
=
4.2V
IN
2
⎛
⎝
= 0.05mW
DSON(LS)
25mV
0.2A
· [V
- 5mΩ · 4 · 1.5MHz
IN
-V
1
⎞
⎠
O
] )
1.5MHz, 250mA Step-Down Converter
= 1.38µF (use 4.7µF)
AAT1121
1121.2007.03.1.2