MAX17528GTJ+ Maxim Integrated Products, MAX17528GTJ+ Datasheet - Page 15

• 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

PIN
10
11
7
8
9
PWRGD
NAME
THRM
SHDN
SKIP
TON
______________________________________________________________________________________
Pulse-Skipping Control Input. This 1.0V logic input signal indicates power usage and sets the
operating mode of the MAX17528. When SKIP is forced high, the controller is immediately set to
automatic pulse-skipping mode. The controller returns to forced-PWM mode when SKIP is forced low
and the output is in regulation. The PWRGD upper threshold is blanked during any downward output-
voltage transition that happens when the controller is in skip mode, and stays blanked until the
transition-related PWRGD blanking period is complete and the output reaches regulation.
IMVP-6.5: The MAX17528 is in skip mode during startup and while in boot mode, but is in forced-PWM
mode during the transition from boot mode to VID mode plus 20µs, and during soft-shutdown,
irrespective of the skip logic level. Connect to the system DPRSLPVR signal.
GMCH 2009: The MAX17528 is in skip mode during startup, while in standby mode, and while exiting
standby mode, but is in forced-PWM mode during soft-shutdown, and while entering standby mode,
irrespective of the skip logic level. Connect to the system GFXDPRSLPVR signal.
Comparator Input for Thermal Protection. THRM connects to the positive input of an internal
comparator. The comparator’s negative input connects to an internal resistive voltage-divider that
accurately sets the THRM threshold to 30% of the V
and thermistor-divider (between V
THRM falls below 30% of V
Switching Frequency Setting Input. An external resistor between the input power source and this
pin sets the switching period (t
TON becomes high impedance in shutdown to reduce the input quiescent current. If the TON
current is less than 10µA, the MAX17528 disables the controller, sets the TON open fault latch,
and pulls DL and DH low.
Open-Drain Power-Good Output. PWRGD is high impedance after output-voltage transitions (except
during power-up and power-down) if FB is in regulation.
During startup, PWRGD is held low.
IMVP-6.5: PWRGD continues to be low while the output is at the boot voltage, and stays low until
5ms (typ) after CLKEN goes low.
GMCH 2009: PWRGD starts monitoring the FB voltage 5ms (typ) after startup (from shutdown or
standby mode) is complete. PWRGD is also held low while in standby mode, and while entering
and exiting standby mode.
PWRGD is forced low during soft-shutdown and while in shutdown. PWRGD is forced high
impedance whenever the slew-rate controller is active (output-voltage transitions), and continues
to be forced high impedance for an additional 20µs after the transition is completed.
The PWRGD upper threshold is blanked during any downward output-voltage transition that
happens when the MAX17528 is in skip mode, and stays blanked until the transition-related
PWRGD blanking period is complete and the output reaches regulation.
A pullup resistor on PWRGD causes additional finite shutdown current.
Active-Low Shutdown Control Input. Connect to V
the controller into the low-power 1µA (max) shutdown state. During startup, the controller ramps up
the output voltage at 1/8 the slew rate set by the TIME resistor to the target voltage defined by the
application circuit:
For IMVP-6.5
For GMCH 2009
During the shutdown transition, the MAX17528 softly ramps down the output voltage at 1/8 the
slew rate set by the TIME resistor. Forcing
clears the fault latches.
Intel IMVP-6.5/GMCH Controllers
(CLKEN pullup to 3.3V with 1.9k
(CLKEN
= GND), the startup target is the voltage set by the VID inputs.
CC
(1.5V when V
SW
CC
t
= 1/f
SW
and GND) to THRM with the values selected so the voltage at
= 16.3pF x (R
SW
) according to the following equation:
SHDN
CC
FUNCTION
1-Phase Quick-PWM
= 5V) at the desired high temperature.
), the startup target is the 1.1V boot voltage.
CC
to 11V~13V disables UVP, thermal shutdown, and
Pin Description (continued)
CC
TON
for normal operation. Connect to ground to put
voltage. Connect the output of a resistor
+ 6.5k )
15