参数资料
型号: PM6670STR
厂商: STMICROELECTRONICS
元件分类: 稳压器
英文描述: 3 A SWITCHING CONTROLLER, QCC24
封装: 4 X 4 MM, LEAD FREE, VFQFPN-24
文件页数: 24/54页
文件大小: 742K
代理商: PM6670STR
Device description
PM6670S
30/54
Doc ID 14432 Rev 4
7.1.4
Mode-of-operation selection
Figure 35.
MODE and DDRSEL multifunction pin configurations
The PM6670S has been designed to satisfy the widest range of applications involving
DDR2/3 memories, SSTL15-18 buses termination and I/O supplies for CPU/chipset. The
device is provided with multilevel pins which allow the user to choose the appropriate
configuration. The MODE pin is used to firstly decide between fixed preset or adjustable
(user defined) output voltages.
When the MODE pin is connected to +5 V, the PM6670S allows setting the VDDQ voltage to
1.8 V or 1.5 V just forcing the DDRSEL multilevel pin to +5 V or to ground respectively (see
a).
In this condition the pulse-skip feature is enabled. This device configuration is suitable for
standard DDR2/3 memory supply applications avoiding the need for an external, high
accuracy, divider for output voltage setting.
Applications requiring different output voltages can be managed by PM6670S simply setting
the adjustable mode. If MODE pin voltage is higher than 4 V, the fixed output mode is
selected. Connecting an external divider to the MODE pin (Figure 35b), it is used as
negative input of the error amplifier and the output voltage is given by expression (21).
Equation 21
PM6670
DDRSEL
MODE
R9
R8
VDDQ
+5V
VREF
PM6670
DDRSEL
MODE
R9
R8
VDDQ
+5V
(a)
(b)
PM6670
DDRSEL
MODE
R9
R8
VDDQ
+5V
VREF
PM6670
DDRSEL
MODE
R9
R8
VDDQ
+5V
(a)
(b)
PM6670S
8
R
9
R
8
R
9
.
0
VDDQ
ADJ
+
=
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