MAX17528GTJ+ Maxim Integrated Products, MAX17528GTJ+ Datasheet - Page 29

• Manufacturer Part Number: MAX17528GTJ+
• Description: IC PWM CTRLR STP-DWN 32TQFN-EP
• Manufacturer: Maxim Integrated Products
• Series: Quick-PWM™r

Specifications of MAX17528GTJ+

• Applications: Controller, Intel IMVP-6.5™ GMCH
• Voltage - Input: 4.5 ~ 5.5 V
• Number Of Outputs: 1
• Voltage - Output: 0.01 ~ 1.5 V
• Operating Temperature: -40°C ~ 105°C
• Mounting Type: Surface Mount
• Package / Case: 32-TQFN Exposed Pad
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Figure 6. Slow Render GMCH Sleep Transition
For GMCH applications (CLKEN = GND), the system
enters the sleep state by stepping the VID code down to
the deeper sleep VID code. During these VID transitions,
the MAX17528 blanks PWRGD (forced high impedance)
until 20µs after the last VID transition is completed. Upon
reaching the low-voltage code, the system asserts
GFXDPRSLPVR, which is connected to the MAX17528
SKIP and SLOW pins as shown in Figure 2, allowing the
voltage regulator to enter a pulse-skipping mode (for
best light-load efficiency).
Slow GMCH sleep exit: To avoid audible noise, the sys-
tem reduces the exit slew rate to minimize surge cur-
rents from the input capacitors to the output capacitors.
GFXDPRSLPVR
NOTE: GFXDPRSLPVR = SKIP = SLOW.
VID (D0–D6)
ACTIVE VID
CPU CORE
VOLTAGE
PWRGD
DH
______________________________________________________________________________________
BLANK HIGH IMPEDANCE
GMCH Sleep Transition
20µs typ
t
BLANK
Intel IMVP-6.5/GMCH Controllers
DEEPER SLEEP VID
PULSE SKIPPING
The exit transition begins by pulling GFXDPRSLPVR
low, followed by LSB VID steps every 2.5µs until the
active VID target is reached (Figure 6).
Fast GMCH sleep exit: When quickly exiting from the
sleep state, the system immediately changes the VID
code to the active VID code (no LSB stepping) and
keeps GFXDPRSLPVR asserted to select the fast
10mV/µs slew rate. Upon completion of the transition,
the system pulls GFXDPRSLPVR low to signal the
beginning of active state operation.
During all VID transitions, the MAX17528 blanks
PWRGD (forced high impedance) until 20µs after the
internal target (which moves at the slew rate set by
R
TIME
) reaches the selected VID code.
1-Phase Quick-PWM
BLANK HIGH IMPEDANCE
1-PHASE FORCED PWM
20µs typ
t
BLANK
ACTIVE VID
DPRSLP VID
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