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PM6680 Datasheet(PDF) 33 Page - STMicroelectronics

Part # PM6680
Description  No Rsense dual step-down controller with adjustable voltages for notebook system power
PDF  49 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

PM6680 Datasheet(HTML) 33 Page - STMicroelectronics

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Equation 14
If hard saturation inductors are used, the inductor saturation current should be much greater
than the maximum inductor peak current Ipeak:
Equation 15
Using soft saturation inductors it's possible to choose inductors with saturation current limit
nearly to Ipeak.
Below there is a list of some inductor manufacturers.
7.13.3
Output capacitor
The selection of the output capacitor is based on the ESR value Rout and the voltage rating
rather than on the capacitor value Cout.
The output capacitor has to satisfy the output voltage ripple requirements. Lower inductor
value can reduce the size of the choke but increases the inductor current ripple
∆I
L.
Since the voltage ripple VRIPPLEout is given by:
Equation 16
A low ESR capacitor is required to reduce the output voltage ripple. Switching sections can
work correctly even with 20mV output ripple.
However, to reduce jitter noise between the two switching sections it's preferable to work
with an output voltage ripple greater than 30mV. If lower output ripple is required, a further
compensation network is needed (see Section 7.13.6: Closing the integrator loop on
page 37
).
Finally the output capacitor choice deeply impacts on the load transient response (see Load
transient response paragraph). Below there is a list of some capacitor manufacturers.
Table 10.
Inductor manufacturer
Manufacturer
Series
Inductor value (uH)
RMS current (A)
Saturation current (A)
COILCRAFT
SER1360
1 to 8
6 to 9.5
7 to 31
COILCRAFT
MLC
0.7 to 4.5
13.6 to 17.3
11.5 to 26
TDK
RLF12560
1 to 10
7.5 to 14.4
7.5 to 18.5
max
IN
OUT
sw
OUT
max
IN
L
V
V
L
f
V
V
(max)
I
×
×
−
=
∆
2
(max)
I
(max)
I
Ipeak
L
LOAD
∆
+
=
L
out
RIPPLEout
I
R
V
∆
×
=



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