AAT1146IJS-0.6-T1 Analogic Tech, AAT1146IJS-0.6-T1 Datasheet - Page 16

• Manufacturer Part Number: AAT1146IJS-0.6-T1
• Description: Switching Converters, Regulators & Controllers Fast Transient 400mA DC/DC Converter
• Manufacturer: Analogic Tech

Specifications of AAT1146IJS-0.6-T1

• Output Voltage: 0.6 V (Adj.)
• Output Current: 400 mA (Max)
• Input Voltage: 2.7 V
• Switching Frequency: 1 MHz
• Operating Temperature Range: - 40 C to + 85 C
• Mounting Style: SMD/SMT
• Package / Case: SC70JW-8
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

Step-Down Converter Design Example
Specifications
V
V
F
T
1.8V Output Inductor
L1 = 3
For Sumida inductor CDRH3D16, 4.7μH, DCR = 105mΩ.
ΔI
1.8V Output Capacitor
V
C
I
Input Capacitor
Input Ripple V
C
I
P = esr · I
P
P
I
16
16
SwitchReg
SwitchReg
RMS
RMS
PKL1
S
AMB
O
IN
DROOP
L1
OUT
esr
IN
L1
=
= I
= 1.8V @ 400mA (adjustable using 0.6V version), Pulsed Load ΔI
= 2.7V to 4.2V (3.6V nominal)
= 1.4MHz
= 85°C
= esr · I
=
=
=
= I
=
⎛
⎝
O
= 0.1V
I
μsec
2
2
V
L1 ⋅ F
O
O
2
V
3 · ΔI
·
A
DROOP
I
1
⋅ DCR = 0.4A
V
+
O
PP
= 0.2Arms
RMS
O
3
ΔI
RMS
2
- ESR · 4 · F
·
⋅ V
2
LOAD
L1
⋅ 1 -
(V
= 5mΩ · (0.2A)
· F
2
TM
TM
PP
⎛
⎝
= 0.4A + 0.068A = 0.468A
O2
= 5mΩ · (45mA)
O
L1 · F · V
S
) · (V
= 25mV
1
= 3
⎞
⎠
=
V
V
IN
0.1V · 1.4MHz
O
μsec
IN(MAX)
2
⎞
⎠
A
⋅ 105mΩ = 17mW
3 · 0.3A
=
S
IN(MAX)
4.7µH ⋅ 1.4MHz
=
⋅ 1.8V = 5.4μH
- V
2
⎛
⎝
O
= 0.2mW
1.8 V
)
2
25mV
0.4A
= 10μW
=
2
= 6.4μF; use 10µF
·
1
3
- 5mΩ · 4 · 1.4MHz
·
4.7μH · 1.4MHz · 4.2V
1.8V · (4.2V - 1.8V)
(use 4.7μH; see Table 1)
⋅ 1 -
1
⎛
⎝
⎞
⎠
w w w . a n a l o g i c t e c h . c o m
w w w . a n a l o g i c t e c h . c o m
1.8V
4.2V
⎞
⎠
= 156mA
= 3.11μF; use 4.7μF
Fast Transient 400mA Step-Down Converter
Fast Transient 400mA Step-Down Converter
= 45mArms
LOAD
= 300mA
PRODUCT DATASHEET
PRODUCT DATASHEET
AAT1146
AAT1146
1146.2009.05.1.7
1146.2009.05.1.7