STEVAL-PSQ001V1 STMicroelectronics, STEVAL-PSQ001V1 Datasheet - Page 33
![BOARD EVAL BASED ON PM6680A](/photos/9/13/91342/steval-psq001v1_sml.jpg)
STEVAL-PSQ001V1
Manufacturer Part Number
STEVAL-PSQ001V1
Description
BOARD EVAL BASED ON PM6680A
Manufacturer
STMicroelectronics
Type
Other Power Managementr
Specifications of STEVAL-PSQ001V1
Design Resources
STEVAL-PSQ001V1 Gerber Files STEVAL-PSQ001V1 Schematic STEVAL-PSQ001V1 Bill of Material
Main Purpose
DC/DC, Step Down with LDO
Outputs And Type
6, Non-Isolated
Voltage - Output
0.9 ~ 2.5 V, 1 ~ 3.3 V, 2x 3.3 V, 2.5 V, 5 V
Current - Output
4A, 2A, 800mA, 400mA, 400mA, 150mA
Voltage - Input
5 ~ 36V
Regulator Topology
Buck
Frequency - Switching
200kHz, 300kHz
Board Type
Fully Populated
Utilized Ic / Part
PM6680A
Input Voltage
5 V to 36 V
Output Voltage
1 V to 3.3 V
Product
Power Management Modules
Silicon Manufacturer
ST Micro
Silicon Core Number
PM6680A
Kit Application Type
Power Management
Application Sub Type
Power Supply
Kit Contents
Board
Rohs Compliant
Yes
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Power - Output
-
Lead Free Status / Rohs Status
Lead free / RoHS Compliant
For Use With/related Products
PM6680A
Other names
497-6425
STEVAL-PSQ001V1
STEVAL-PSQ001V1
PM6680A
9.5
Power MOSFETS
Logic-level MOSFETs are recommended, since low side and high side gate drivers are
powered by LDO5. Their breakdown voltage VBR
In notebook applications, power management efficiency is a high level requirement. The
power dissipation on the power switches becomes an important factor in switching
selections. Losses of high-side and low-side MOSFETs depend on their working conditions.
The power dissipation of the high-side MOSFET is given by:
Equation 18
Maximum conduction losses are approximately:
Equation 19
where RDSon is the drain-source on resistance of the high side MOSFET.
Switching losses are approximately:
Equation 20
where t
As general rule, high side MOSFETs with low gate charge are recommended, in order to
minimize driver losses.
Below there is a list of possible choices for the high side MOSFET.
Table 13.
The power dissipation of the low side MOSFET is given by:
Equation 21
Maximum conduction losses occur at the maximum input voltage:
Manufacturer
P
switching
on
and t
ST
High side MOSFET manufacturer
=
off
V
IN
are the switching times of the turn
×
I (
LOAD
STS5NF60L
P
conduction
(max)
Type
P
DHighSide
2
−
P
∆
=
2
DLowSide
I
R
L
)
DSon
=
×
P
t
on
conduction
×
Gate charge (nC)
=
×
V
V
P
f
IN
OUT
sw
conduction
min
DSS
+
25
+
×
on
V
P
I
IN
LOAD
must be higher than V
switching
and turn
×
I (
(max)
LOAD
(max)
off
2
Rated reverse voltage (V)
phases of the MOSFET.
2
+
∆
Design guidelines
2
I
L
)
×
INmax
60
t
off
×
.
f
sw
33/48