ISL6218_14 Datasheet, PDF (11/19 Pages) Intersil Corporation – Precision Single-Phase Buck PWM Controller for Intel Mobile Voltage Positioning IMVP-IV and IMVP-IV+

ISL6218
VID[0..5]
CURRENT VID CODE
<600ns
V_{CC_CORE} ^{CURRENT VOLTAGE LEVEL}
NEW VID CODE
NEW VOLTAGE LEVEL
PGOOD
HIGH
FIGURE 5. PLOT SHOWING TIMING OF VID CODE CHANGES AND CORE VOLTAGE SLEWING AS WELL AS PGOOD MASKING
VID[0..5]
VID CODE REMAINS THE SAME
STP_CPU
(DSEN)
VID COMMAND VOLTAGE
V_{CC_CORE}
<3µs
V_{DEEP SLEEP}
FIGURE 6. CORE VOLTAGE SLEWING TO 98.8% OF PROGRAMMED VID VOLTAGE FOR A LOGIC LEVEL LOW ON DSEN
VID[0..5]
VID CODE REMAINS THE SAME
STP_CPU
(DSEN)
DPRSLPVR
(DRSEN)
V_{CC_CORE}
DEEPER SLEEP
SHORT DPRSLP CAUSES V_{CC_CORE} TO RAMP-UP
V_DEEP
V_DEEPER
FIGURE 7. VCORE RESPONSE FOR DEEPER SLEEP COMMAND
Deep Sleep Enable (DSEN) and Deeper Sleep
Enable (DRSEN)
Table 2 shows logic states controlling modes of operation
Figure 6 and Figure 5 show the timing for transitions entering
and exiting Deep Sleep Mode and Deeper Sleep Mode,
controlled by the system signals STPCPU and DPRSLPVR.
Pins DSEN (Deep Sleep Enable) and DRSEN (Deeper
Sleep Enable) of the ISL6218 are connected to these 2
signals, respectively.
For the case when DSEN is logic high, and DRSEN is logic
low, the controller will operate in Active Mode and regulate
the output voltage to the VID commanded DAC voltage
minus the voltage “Droop” as determined by the load current.
Voltage “Droop” is the reduction of output voltage
proportional to output current.
When a logic low is seen on the DSEN and DRSEN is logic
low the controller will then regulate the output voltage to the
voltage seen on the DSV pin minus “Droop”.
When DSEN is logic low and DRSEN is logic high the
controller will operate in Deeper Sleep mode. The ISL6218
will then regulate to the voltage seen on the DRSV pin minus
“Droop”.
Deep and Deeper Sleep voltage levels are programmable
and explained in “STV, DSV and DRSV” on page 12.
DISCONTINUOUS OPERATION - PSI
The ISL6218 Single-Phase PWM controller is a
Synchronous Buck Regulator. However, in Deep and Deeper
Sleep modes where the load current is low, the controller
operates as a standard buck regulator. This mode of
operation acts to eliminate negative inductor current by
truncating the low side MOSFET gate drive pulse, and
11
FN9101.6
August 6, 2007