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RT9205APS Datasheet(PDF) 11 Page - Richtek Technology Corporation

Part # RT9205APS
Description  Dual Regulators - Synchronous Buck PWM DC-DC and Linear Controller
PDF  15 Pages
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Manufacturer  RICHTEK [Richtek Technology Corporation]
Direct Link  http://www.richtek.com
Logo RICHTEK - Richtek Technology Corporation

RT9205APS Datasheet(HTML) 11 Page - Richtek Technology Corporation

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RT9205/A
Preliminary
11
DS9205/A-08 March 2007
www.richtek.com
Inductor Selection
The RT9205/A was designed for VIN = 5V, step-down
application mainly. Figure 6 shows the typical topology
and waveforms of step-down converter.
The ripple current of inductor can be calculated as follows:
Because operation frequency is fixed at 300kHz,
The VOUT ripple is
ESR is the equivalent series resistor of output capacitor
Table 1 shows the ripple voltage of VOUT at VIN = 5V
Table 1
Figure 5
Figure 6
*Refer to Sanyo low ESR series (CE, DX, PX.....)
The suggested L and C are as follows:
2
µH with ≥ 1500µF COUT
5
µH with ≥ 1000µF COUT
0A
0V
2V
4V
T1
T2
T3
TIME
COUNT = 1
COUNT = 2
COUNT = 3
OVERLOAD
APPLIED
T0
I
D
i
D
i
Q
I
Q
uQ
uI
L
i
L
I
L
= I
O
V
L
V
I
- V
O
- V
O
T
S
T
ON
T
OFF
V
I
V
O
R
C
D
L
Q
C.C.M.
VOUT
3.3V
2.5V
1.5V
Inductor
2
µH
5
µH
2
µH
5
µH
2
µH
5
µH
1000
µF (ESR=53mΩ)
100mV
40mV
110mV
44mV
93mV
37mV
1500
µF (ESR=33mΩ)
62mV
25mV
68mV
28mV
58mV
23mV
3000
µF (ESR=21mΩ)
40mV
16mV
43mV
18mV
37mV
15mV
×
OUT
RIPPLE
ON
(5V - V)
IL
=T
L
×
OUT
ON
V
T
= 3.33
5V
×
OUT RIPPLE
RIPPLE
V
= IL
ESR



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