PM6680ATR STMicroelectronics, PM6680ATR Datasheet - Page 34
PM6680ATR
Manufacturer Part Number
PM6680ATR
Description
IC CTRLR DUAL STEP DOWN 32VFQFPN
Manufacturer
STMicroelectronics
Datasheet
1.PM6680ATR.pdf
(48 pages)
Specifications of PM6680ATR
Applications
Controller, Embedded Computer System
Voltage - Input
6 ~ 36 V
Number Of Outputs
2
Voltage - Output
0.9 ~ 5 V
Operating Temperature
-40°C ~ 125°C
Mounting Type
Surface Mount
Package / Case
32-VFQFN, 32-VFQFPN
For Use With
497-6379 - BOARD EVALUATION FOR PM6680A497-6378 - BOARD EVALUATION FOR PM6680497-6425 - BOARD EVAL BASED ON PM6680A
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Other names
497-6896-2
PM6680ATR
PM6680ATR
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
PM6680ATR
Manufacturer:
STMicroelectronics
Quantity:
10 000
Design guidelines
34/48
Equation 22
Choose a synchronous rectifier with low R
variation of the phase node voltage can bring up even the low side gate through its gate-
drain capacitance C
that minimizes the ratio C
Below there is a list of some possible low side MOSFETs.
Table 10. Low side MOSFET manufacturer
Dual n-channel MOSFETs can be used in applications with a maximum output current of
about 3 A. Below there is a list of some MOSFET manufacturers.
Table 14.
A rectifier across the low side MOSFET is recommended. The rectifier works as a voltage
clamp across the synchronous rectifier and reduces the negative inductor swing during the
dead time between turning the high-side MOSFET off and the synchronous rectifier on. It
can increase the efficiency of the switching section, since it reduces the low side switch
losses. A shottky diode is suitable for its low forward voltage drop (0.3 V). The diode reverse
voltage must be greater than the maximum input voltage V
reverse charge is preferable. Below there is a list of some shottky diode manufacturers.
Table 15.
Manufacturer
Manufacturer
Manufacturer
ST
ST
ST
Dual MOSFET manufacturer
Schottky diode manufacturer
RSS
STPS1L40M
STS4DNF60L
P
, causing cross-conduction problems. Choose a low side MOSFET
Series
conduction
RSS
Type
STS7NF60L
/C
Type
GS
=
(C
R
Forward voltage
DSon
GS
R
DSon
= C
×
0.5
(V)
DSon
⎛
⎜ ⎜
⎝
50
R
1
ISS
[VC11] 19
DSon
(mΩ)
−
. When high side MOSFET turns on, the fast
V
- C
V
IN
OUT
(mΩ)
max
RSS
Gate charge
⎞
⎟ ⎟
⎠
).
×
Rated reverse
I
voltage (V)
LOAD
(nC)
15
INmax
0.0625
C
--------------
C
40
RSS
(max)
GS
. A minimum recovery
2
Rated reverse voltage
Rated reverse voltage
Reverse current
(V)
(V)
60
60
(uA)
21
PM6680A