PM6670S STMicroelectronics, PM6670S Datasheet - Page 46

• Manufacturer Part Number: PM6670S
• Description: IC CTLR DDR2/3 MEM PS VFQFPN-24
• Manufacturer: STMicroelectronics

Specifications of PM6670S

• Applications: Memory, DDR2/DDR3 Regulator
• Current - Supply: 800µA
• Voltage - Supply: 4.5 V ~ 36 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 24-VFQFN, 24-VFQFPN
• For Use With: 497-8411 - BOARD EVAL PM6670S DDR2/3
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Application information
8.1.5
46/54
Tested low-side MOSFETs are listed in
Table 17.
Dual N-MOS can be used in applications with lower output current.
Table 18
Table 18.
Diode selection
A rectifier across the synchronous switch 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.
Moreover it increases the efficiency of the system.
Choose a schottky diode as long as its forward voltage drop is very little (0.3 V). The reverse
voltage should be greater than the maximum input voltage V
reverse charge is preferable.
Table 19.
Manufacturer
Manufacturer
Manufacturer
ST
ST
ST
IR
ST
ST
IR
shows some suitable dual MOSFETs for applications requiring about 3 A.
Evaluated low-side MOSFETs
Suitable dual MOSFETs
Evaluated recirculation rectifiers
STS8DNH3LL
STS12NH3LL
STS25NH3LL
STPS1L30M
STPS1L30A
IRF7313
IRF7811
Type
Type
Type
Table 19
R
R
voltage (V)
Doc ID 14432 Rev 4
DSon
DSon
Forward
13.5
0.34
0.34
4.0
25
46
24
(mΩ)
(mΩ)
shows some evaluated diodes.
Table 17
Gate charge (nC)
Rated reverse
.
voltage (V)
C
GD
0.069
0.011
0.054
30
30
10
33
\ C
GS
INmax
and a minimum recovery
Rated reverse voltage (V)
Rated reverse voltage (V)
Reverse current (μA)
0.00039
0.00039
30
30
30
30
30
PM6670S