PRODUCT DATASHEET
AAT2610
7-Channel PMU for Digital Still Cameras
Max DC
Current
(A)
Inductance
DCR
(mΩ)
Size (mm)
LxWxH
Suit for
Channel
Manufacturer
Part Number
(μH)
Type
CDRH4D22/HP
CDRH8D28
2.2
2.5
2.5
2.2
1.8
3.3
4.7
4.7
2.2
4.7
2.2
3.3
4.7
2.2
3.3
4.7
3.2
4.5
35.4
12
4.5x4.5x2.4
8.3x8.3x3
shielded
shielded
shielded
shielded
shielded
shielded
shielded
shielded
shielded
shielded
shielded
shielded
shielded
unshielded
unshielded
unshielded
SU
SU
0.53
0.60
0.65
0.50
1.0
0.75
1.6
1.2
120
115
105
139
135
190
48
110
149
195
246
76
3.2x3.2x1.0
3.2x3.2x1.0
3.2x3.2x1.0
3.2x3.2x1.0
3.2x3.2x1.55
3.2x3.2x1.2
3.2x3.2x2.0
3.2x3.2x2.0
3.1x3.1x1.0
3.1x3.1x1.0
3.1x3.1x1.2
3.2x2.5x1.55
3.2x2.5x1.55
3.2x2.5x1.55
Main SD, SD1, SD2
Main SD, SD1, SD2
SD2
CDRH2D09
Sumida
CDRH2D09C
CDRH2D14
CDRH2D11/HP
CDRH2D18/HP
CDRH2D18/HP
SD3110
SD3110
SD3112
LQH32PN2R2NN0
LQH32PN3R3NN0
LQH32PN4R7NN0
Main SU
AUX1, AUX2, AUX3
Main SD, SD1, SD2
AUX1, AUX2, AUX3
Main SD, SD1, SD2
Main SU, SD1, SD2
AUX1, AUX2, AUX3
Main SD, SD1, SD2
Main SU, SD1, SD2
AUX1, AUX2, AUX3
1.0
Cooper
Murata
0.81
0.80
1.6
1.2
1.0
120
180
Table 3: Suggested Inductor Selection Information.
To step-up converter,
selected output capacitors, not only calculating the out-
put capacitor minimum values are necessary according
to the equations, but the actual capacitance must be
carefully considered to get expected output voltage rip-
ple. X5R and X7R dielectric materials of ceramic capaci-
tors are preferred for their ability to maintain capaci-
tance over wide voltage and temperature ranges.
IOUT_MAX
1 - D
VIN · D
2 · f · L
IL_SAT
>
+
Among it,
VIN
D = 1 -
VOUT
To step-up converter,
D · IOUT
ΔVOUT · f
To step-down converter,
COUT
≥
(VIN - VOUT) · D
2 · f · L
To step-down converter,
IL_SAT > IOUT_MAX
+
VOUT
Among it,
COUT
≥
· (1 - D)
8 · f2 · L · ΔVOUT
VOUT
VIN
D =
For example, to step-up converter, when VIN = 3.6V, IOUT
= 900mA, and f = 1.5MHz, output ripple requires below
30mV. According to the equation above, the calculated
Input and Output Capacitor Selection
C
OUT should be higher than 5.6μF. If use Sumida 22μF/6.3V
0805 ceramic capacitor, its capacitance at 5V DC bias is
8.0μF which can meet the ripple requirements.
Low ESR (equivalent series resistance) capacitors should
be used to minimize output voltage ripple. Multilayer
ceramic capacitors are an excellent choice as they have
extremely low ESR and are available in small footprints.
The following equations show the minimum capacitance
under the required output voltage ripple for step-up and
step-down converters. In actual application, capacitance
usually decreases a lot as its DC bias increases. So when
Input capacitors for input decoupling should be located
as close as possible to the device to get better input
power filtering effect. Select 1μF to 4.7μF X5R or X7R
ceramic capacitors for the inputs. Table 4 shows sug-
gested capacitor part numbers.
w w w . a n a l o g i c t e c h . c o m
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2610.2008.11.1.1
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