Datasheet

General Description
The MAX17528 comprises 1-phase Quick-PWM™ step-
down VID power-supply controllers for Intel notebook
CPUs. The Quick-PWM control provides instantaneous
response to fast-load current steps. Active voltage
positioning reduces power dissipation and bulk output
capacitance requirements and allows ideal positioning
compensation for tantalum, polymer, or ceramic bulk
output capacitors.
The MAX17528 is intended for two different notebook
CPU/GPU core applications: either bucking down the bat-
tery directly to create the core voltage, or bucking down
the +5V system supply. The single-stage conversion
method allows these devices to directly step down high-
voltage batteries for the highest possible efficiency.
Alternatively, 2-stage conversion (stepping down the
+5V system supply instead of the battery) at higher
switching frequency provides the minimum possible
physical size.
A slew-rate controller allows controlled transitions
between VID codes. A thermistor-based temperature
sensor provides programmable thermal protection. A
current monitor provides an analog output current pro-
portional to the processor load current.
The MAX17528 implements both the Intel IMVP-6.5
CPU core specifications (CLKEN pullup to 3.3V), as
well as the Intel GMCH graphics core specifications
(CLKEN = GND). The MAX17528 is available in a
32-pin, 5mm x 5mm TQFN package.
Applications
IMVP-6.5 Core Power Supply
Intel GMCH 2009
Intel Calpella Platforms
Graphics Core Power Supply
Voltage-Positioned Step-Down Converters
1-to-4 Lithium-Ion (Li+)-Cell Battery-to-CPU Core
Supply Converters
Notebooks/Desktops/Servers
Features
o 1-Phase Quick-PWM Controller
o ±0.5% V
OUT
Accuracy Over Line, Load, and
Temperature
o 7-Bit IMVP-6.5 DAC
o IMVP-6.5 and GMCH Compliant
o Active Voltage Positioning with Adjustable Gain
o Accurate Droop and Current Limit
o Remote Output and Ground Sense
o Adjustable Output-Voltage Slew Rate
o Power-Good Window Comparator
o Current Monitor
o Temperature Comparator
o Drives Large Synchronous Rectifier FETs
o 2V to 26V Battery Input Range
o Adjustable Switching Frequency (600kHz max)
o Undervoltage and Thermal-Fault Protection
o Soft-Startup and Soft-Shutdown
o Internal Boost Diode
MAX17528
1-Phase Quick-PWM
Intel IMVP-6.5/GMCH Controllers
________________________________________________________________ Maxim Integrated Products 1
MAX17528
THIN QFN
5mm x 5mm
TOP VIEW
PAD
GND
29
30
28
27
12
11
13
GNDS
CSN
CSP
SLOW
SKIP
14
IMON
V
DD
PGND D6 BST D5 D4
12
VRHOT
4567
2324 22 20 19 18
TIME
ILIM
D0
GND
CLKEN
SHDN
FB
DL
3
21
31
10
V
CC
PWRGD
32
9
CCV
TON
PGDIN
26
15
D1
DH
25
16
D2
THRM
D3
8
17
LX
Pin Configuration
Ordering Information
19-4723; Rev 0; 7/09
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
EVALUATION KIT
AVAILABLE
+ Denotes a lead(Pb)-free/RoHS-compliant package.
* EP = Exposed pad.
PART TEMP RANGE PIN-PACKAGE
MAX17528GTJ+ -40
o
C to +105
o
C 32 TQFN-EP*
Quick-PWM is a trademark of Maxim Integrated Products, Inc.