STEVAL-ISA051V2 STMicroelectronics, STEVAL-ISA051V2 Datasheet - Page 43
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STEVAL-ISA051V2
Manufacturer Part Number
STEVAL-ISA051V2
Description
BOARD EVAL PM6670AS DDR2/3
Manufacturer
STMicroelectronics
Type
DC/DC Switching Converters, Regulators & Controllersr
Specifications of STEVAL-ISA051V2
Design Resources
STEVAL-ISA051V2 Gerber Files STEVAL-ISA051V2 Schematic STEVAL-ISA051V2 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 ~ 36V
Regulator Topology
Buck
Board Type
Fully Populated
Utilized Ic / Part
PM6670A
Input Voltage
4.5 V to 36 V
Output Voltage
1.8 V, 1.5 V
Product
Power Management Modules
Silicon Manufacturer
ST Micro
Silicon Core Number
PM6670AS
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
PM6670AS
Other names
497-8412
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
STEVAL-ISA051V2
Manufacturer:
STMicroelectronics
Quantity:
1
PM6670AS
8.1.4
If ceramic capacitors are used, the output voltage ripple due to inductor current ripple is
negligible. Then the inductance could be smaller, reducing the size of the choke. In this case
it is important that output capacitor can adsorb the inductor energy without generating an
over-voltage condition when the system changes from a full load to a no load condition.
The minimum output capacitance can be chosen by the following equation:
Equation 38
where Vf is the output capacitor voltage after the load transient, while V
capacitor voltage before the load transient.
In
Table 15.
MOSFETs selection
In most of the applications, power management efficiency is a high level requirement. Power
dissipation on the power switches becomes an important factor in the selection of switches.
Losses of high-side and low-side MOSFETs depend on their working condition.
Considering the high-side MOSFET, the power dissipation is calculated as:
Equation 39
Maximum conduction losses are approximately given by:
Equation 40
Table 15
Manufacturer
HITACHI
SANYO
are listed some tested polymer capacitors are listed.
Evaluated output capacitors
TNCB OE227MTRYF
4TPE220MF
4TPE150MI
4TPC220M
Series
P
conduction
P
Doc ID 14436 Rev 2
DHighSide
C
OUT
=
R
,
min
=
Capacitance
DSon
P
conduction
=
(μF)
220
220
220
220
L
⋅
Vf
V
⋅
V
I
IN
LOAD
OUT
2
.
min
−
+
Vi
,
MAX
P
⋅
I
2
switching
LOAD
Rated voltage
2
,
MAX
2.5 V
4 V
4 V
4 V
(V)
2
Application information
I
ESR max @100 kHz
is the output
15 to 25
(mΩ)
25
18
40
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