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PM6670 Arkusz danych(PDF) 30 Page - STMicroelectronics

Numer części PM6670
Szczegółowy opis  Complete DDR2/3 memory power supply controller
PDF  53 Pages
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Producent  STMICROELECTRONICS [STMicroelectronics]
Strona internetowa  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

PM6670 Arkusz danych(HTML) 30 Page - STMicroelectronics

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Device description
PM6670
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VDDQ output voltage can be set in the range from 0.9V to 2.6V. Adjustable mode
automatically switches DDRSEL pin to become the power saving algorithm selector: if tied
to +5V, the forced-PWM (fixed frequency) control is performed. If grounded or connected to
VREF pin (1.237V reference voltage), the Pulse-Skip or Non-Audible Pulse-Skip Modes are
respectively selected.
7.1.5
Current sensing and current limit
The PM6670 switching controller uses a valley current sensing algorithm to properly handle
the current limit protection and the inductor current zero-crossing information. The current is
sensed during the conduction time of the low-side MOSFET. The current sensing element is
the on-resistance of the low-side switch. The sensing scheme is visible in Figure 36.
Figure 36. Current sensing scheme
An internal 100
µA current source is connected to C
SNS pin that is also the non-inverting
input of the positive current limit comparator. When the voltage drop developed across the
sensing parameter equals the voltage drop across the programming resistor RILIM, the
controller skips subsequent cycles until the overcurrent condition is detected or the output
UV protection latches off the device (see Section 7.1.11: Over Voltage and Under Voltage
Protections on page 35
).
Table 8. Mode-Of-Operation settings summary
Mode
DDRSEL
VDDQ
Operating mode
VMODE > 4.3V
VDDRSEL > 4.2V
1.8V
Pulse-Skip
1V < VDDRSEL < 3.5V
1.5V
<0.5V
VMODE < 3.7V
VDDRSEL > 4.2V
ADJ
Forced-PWM
1V < VDDRSEL < 3.5V
Non-Audible Pulse-skip
VDDRSEL < 0.5V
Pulse-Skip
HGATE
PHASE
CSNS
LGATE
PGND
PM6670
100µA·
R
ILIM
V
IN
V
OUT
I
VALLEY·RDSon
HGATE
PHASE
CSNS
LGATE
PGND
PM6670
100µA·
R
ILIM
V
IN
V
OUT
I
VALLEY·RDSon



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