STEVAL-ISA051V1 STMicroelectronics, STEVAL-ISA051V1 Datasheet - Page 43
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STEVAL-ISA051V1
Manufacturer Part Number
STEVAL-ISA051V1
Description
BOARD EVAL PM6670S DDR2/3
Manufacturer
STMicroelectronics
Type
DC/DC Switching Converters, Regulators & Controllersr
Specifications of STEVAL-ISA051V1
Design Resources
STEVAL-ISA051V1 Gerber Files STEVAL-ISA051V1 Schematic STEVAL-ISA051V1 Bill of Material
Main Purpose
Special Purpose DC/DC, DDR Memory Supply
Outputs And Type
4, Non-Isolated
Voltage - Output
1.5V, 1.8V
Voltage - Input
4.5 ~ 28V
Regulator Topology
Buck
Board Type
Fully Populated
Utilized Ic / Part
PM6670
Input Voltage
4.5 V to 28 V
Output Voltage
1.8 V, 1.5 V
Product
Power Management Modules
Silicon Manufacturer
ST Micro
Silicon Core Number
PM6670S
Kit Application Type
Power Management
Application Sub Type
DDR2/3 Memory Power Supply Controller
Kit Contents
Board
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Current - Output
-
Power - Output
-
Frequency - Switching
-
Lead Free Status / Rohs Status
Lead free / RoHS Compliant
For Use With/related Products
PM6670S
Other names
497-8411
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
STEVAL-ISA051V1
Manufacturer:
STMicroelectronics
Quantity:
1
PM6670S
8.1.3
It must be taken into account that in some MLCC the capacitance decreases when the
operating voltage is near the rated voltage. In
applications are listed.
Table 14.
Output capacitor selection
Using tantalum or electrolytic capacitors, the selection is made referring to ESR and voltage
rating rather than by a specific capacitance value.
The output capacitor has to satisfy the output voltage ripple requirements. At a given
switching frequency, small inductor values are useful to reduce the size of the choke but
increase the inductor current ripple. Thus, to reduce the output voltage ripple a low ESR
capacitor is required.
To reduce jitter noise between different switching regulators in the system, it is preferable to
work with an output voltage ripple greater than 25 mV.
As far as it concerning the load transient requirements, the equivalent series resistance
(ESR) of the output capacitor must satisfy the following relationship:
Equation 36
where V
In addition, the ESR must be high enough high to meet stability requirements. The output
capacitor zero must be lower than the switching frequency:
Equation 37
TAIYO YUDEN UMK325BJ106KM-T
TAIYO YUDEN
TAIYO YUDEN
TAIYO YUDEN
Manufacturer
TDK
RIPPLE
Evaluated MLCC for input filtering
is the maximum tolerable ripple voltage.
GMK325F106ZH-T
C3225X5R1E106M
GMK316F106ZL-T
GMK325BJ106KN
Series
Doc ID 14432 Rev 4
f
SW
Capacitance (μF) Rated voltage (V)
ESR
>
f
Z
≤
=
10
10
10
10
10
V
2
RIPPLE
⋅ π
Δ
Table 14
I
ESR
, L
MAX
1
,
MAX
⋅
C
some MLCC suitable for most of
out
35
35
25
50
35
Application information
Maximum Irms
@100 kHz (A)
2.2
2.2
2.5
2
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