19-4723; Rev 0; 7/09
KIT
ATION
EVALU
BLE
AVAILA
1-Phase Quick-PWM
Intel IMVP-6.5/GMCH Controllers
General Description
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
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.
Ordering Information
PART
MAX17528GTJ+
TEMP RANGE
-40
o
C to +105
o
C
PIN-PACKAGE
32 TQFN-EP*
+Denotes
a lead(Pb)-free/RoHS-compliant package.
*EP
= Exposed pad.
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
LX 25
DH 26
PGDIN 27
VRHOT 28
TIME 29
ILIM 30
V
CC
31
CCV 32
1
IMON
2
GNDS
3
FB
4
BST
V
DD
Pin Configuration
TOP VIEW
PGND
DL
D6
D5
D4
18
D3
17
16
15
14
13
D2
D1
D0
GND
CLKEN
SHDN
PWRGD
TON
12
11
10
9
5
CSP
6
SLOW
7
SKIP
8
THRM
24
23
22
21
20
19
MAX17528
PAD
GND
Quick-PWM is a trademark of Maxim Integrated Products, Inc.
THIN QFN
5mm x 5mm
________________________________________________________________
Maxim Integrated Products
CSN
1
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.
1-Phase Quick-PWM
Intel IMVP-6.5/GMCH Controllers
MAX17528
ABSOLUTE MAXIMUM RATINGS
V
CC
, V
DD
to GND .....................................................-0.3V to +6V
D0–D6 to GND..........................................................-0.3V to +6V
CSP, CSN to GND ....................................................-0.3V to +6V
ILIM, THRM, PGDIN,
VRHOT,
PWRGD to GND .......-0.3V to +6V
CLKEN
to GND.........................................................-0.3V to +6V
SKIP,
SLOW
to GND.................................................-0.3V to +6V
CCV, FB, IMON, TIME to GND ...................-0.3V to (V
CC
+ 0.3V)
SHDN
to GND (Note 1)...........................................-0.3V to +30V
TON to GND ...........................................................-0.3V to +30V
GNDS, PGND to GND ...........................................-0.3V to +0.3V
DL to PGND................................................-0.3V to (V
DD
+ 0.3V)
BST to GND ............................................................-0.3V to +36V
LX to BST..................................................................-6V to +0.3V
BST to VDD.............................................................-0.3V to +30V
DH to LX ....................................................-0.3V to (V
BST
+ 0.3V)
Continuous Power Dissipation (32-pin, 5mm x 5mm TQFN)
Up to +70°C ..............................................................1702mW
Derating above +70°C ..........................................21.3mW/°C
Operating Temperature Range .........................-40°C to +105°C
Junction Temperature ......................................................+150°C
Storage Temperature Range .............................-65°C to +165°C
Lead Temperature (soldering, 10s) .................................+300°C
Note 1:
SHDN
can be forced to 12V for the purpose of debugging prototype breadboards using the no-fault test mode, which dis-
ables fault protection.
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
ELECTRICAL CHARACTERISTICS
(Circuit of Figure 1, V
IN
= 12V, V
DD
= V
CC
= 5V,
CLKEN
pullup to 3.3V with 1.9kΩ,
SHDN
=
SLOW
= ILIM = PGDIN = V
CC
, SKIP =
GNDS = PGND = GND, V
FB
= V
CSP
= V
CSN
= 1.200V, D0–D6 set for 1.20V (D0–D6 = 0001100).
T
A
= 0°C to +85°C,
unless otherwise
specified. Typical values are at T
A
= +25°C.) (Note 2)
PARAMETER
PWM CONTROLLER
Input-Voltage Range
V
CC
, V
DD
Measured at FB with
respect to GNDS;
includes load-
regulation error
(Note 3)
V
BOOT
DAC codes from
0.8125V to 1.5000V
DAC codes from
0.3750V to 0.8000V
DAC codes from 0V
to 0.3625V
4.5
-0.5
-7
-20
1.094
-200
A
GNDS
I
GNDS
V
TIME
V
OUT
/ V
GNDS
, -200mV
T
A
= +25°C
V
GNDS
+200mV
0.97
-2
1.985
-10
-15
2.000
1.00
1.100
0.1
+200
1.03
+2
2.015
+10
+15
%
5.5
+0.5
+7
mV
+20
1.106
V
%
mV
V/V
µA
V
V
%
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
DC Output-Voltage Accuracy
Boot Voltage
Line Regulation Error
GNDS Input Range
GNDS Gain
GNDS Input Bias Current
TIME Voltage
IMVP-6.5 (CLKEN pullup to 3.3V with 1.9k )
V
CC
= 4.5V to 5.5V, V
IN
= 4.5V to 26V
V
CC
= 4.5V to 5.5V,
I
TIME
= 28µA (R
TIME
= 71.5k )
R
TIME
= 71.5k
(12.5mV/µs nominal)
R
TIME
= 35.7k (25mV/µs nominal) to
178k (5mV/µs nominal)
TIME Slew-Rate Accuracy
Soft-start and soft-shutdown;
R
TIME
= 35.7k (3.125mV/µs nominal) to
178k (0.625mV/µs nominal)
SLOW
= GND,
R
TIME
= 35.7k (12.5mV/µs nominal) to
178k (2.5mV/µs nominal)
-20
+20
-20
+20
2
_______________________________________________________________________________________
1-Phase Quick-PWM
Intel IMVP-6.5/GMCH Controllers
ELECTRICAL CHARACTERISTICS (continued)
(Circuit of Figure 1, V
IN
= 12V, V
DD
= V
CC
= 5V,
CLKEN
pullup to 3.3V with 1.9kΩ,
SHDN
=
SLOW
= ILIM = PGDIN = V
CC
, SKIP =
GNDS = PGND = GND, V
FB
= V
CSP
= V
CSN
= 1.200V, D0–D6 set for 1.20V (D0–D6 = 0001100).
T
A
= 0°C to +85°C,
unless otherwise
specified. Typical values are at T
A
= +25°C.) (Note 2)
PARAMETER
On-Time
Minimum Off-Time
TON Shutdown Input Current
BIAS CURRENTS
Quiescent Supply Current (V
CC
)
I
CC
Measured at V
CC
, V
SKIP
= 5V, FB forced
above the regulation point
Measured at V
DD
, SKIP = GND,
FB forced above the regulation point,
T
A
= +25°C
Measured at V
CC
,
SHDN
= GND
Measured at V
DD
,
SHDN
= GND, T
A
= +25°C
Measured at FB with respect to unloaded
output voltage
FB forced 25mV below trip threshold
IMVP-6.5:
CLKEN
pullup to 3.3V with 1.9k ;
measured from the time when FB reaches
the boot target voltage (Note 3); the time
needed for FB to reach this target voltage is
based on the slew rate set by R
TIME
IMVP-6.5:
CLKEN
pullup to 3.3V with 1.9k ;
measured at startup from the time when
CLKEN
goes low
PWRGD Startup Delay
GMCH:
CLKEN
= GND; measured from the
time when FB reaches the target voltage (Note
3); the time needed for FB to reach this target
voltage is based on the slew rate set by R
TIME
Measured at FB
with respect to
unloaded output
voltage, 15mV
hysteresis (typ)
t
BLANK
Lower threshold,
falling edge
(undervoltage)
Upper threshold, rising
edge (overvoltage)
1.5
3
mA
SYMBOL
t
ON
t
OFF(MIN)
V
IN
= 12V,
V
FB
= 1.2V
(Note 4)
CONDITIONS
R
TON
= 96.75k
R
TON
= 200k
R
TON
= 303.25k
MIN
142
300
425
TYP
167
333
500
300
0.01
MAX
192
366
575
375
1
ns
µA
ns
UNITS
MAX17528
Measured at DH (Note 4)
SHDN
= GND, V
IN
= 26V, V
CC
= V
DD
= 0V or
5V, T
A
= +25°C
Quiescent Supply Current (V
DD
)
Shutdown Supply Current (V
CC
)
Shutdown Supply Current (V
DD
)
FAULT PROTECTION
Output Undervoltage-Protection
Threshold
Output Undervoltage
Propagation Delay
IMVP-6.5
CLKEN
Startup Delay
(Boot Time Period,
CLKEN
Pullup
to 3.3V with 1.9k )
I
DD
0.02
15
0.01
1
30
1
µA
µA
µA
V
UVP
t
UVP
-450
-400
10
-350
mV
µs
t
BOOT
20
60
100
µs
3
5
8
ms
3
5
8
PWRGD and
CLKEN
(IMVP-6.5,
CLKEN
Pullup to 3.3V with
1.9k ) Threshold
PWRGD and
CLKEN
(IMVP-6.5,
CLKEN
Pullup to 3.3V with
1.9k ) Transition Blanking Time
PWRGD and
CLKEN
(IMVP-6.5,
CLKEN
Pullup to 3.3V with
1.9k ) Delay
-350
-300
-250
mV
+150
+200
+250
Measured from the time when FB reaches
the target voltage (Note 3) based on the
slew rate set by R
TIME
FB forced 25mV outside the PWRGD
trip thresholds
20
µs
10
µs
_______________________________________________________________________________________
3
1-Phase Quick-PWM
Intel IMVP-6.5/GMCH Controllers
MAX17528
ELECTRICAL CHARACTERISTICS (continued)
(Circuit of Figure 1, V
IN
= 12V, V
DD
= V
CC
= 5V,
CLKEN
pullup to 3.3V with 1.9kΩ,
SHDN
=
SLOW
= ILIM = PGDIN = V
CC
, SKIP =
GNDS = PGND = GND, V
FB
= V
CSP
= V
CSN
= 1.200V, D0–D6 set for 1.20V (D0–D6 = 0001100).
T
A
= 0°C to +85°C,
unless otherwise
specified. Typical values are at T
A
= +25°C.) (Note 2)
PARAMETER
IMVP-6.5
CLKEN
Output
Low Voltage
IMVP-6.5
CLKEN
High
Leakage Current
IMVP-6.5
CLKEN
Shutdown
Leakage Current
PWRGD Output Low Voltage
PWRGD Leakage Current
V
CC
Undervoltage Lockout
Threshold
CSN Discharge Resistance in
UVLO and Shutdown
THERMAL PROTECTION
VRHOT
Trip Threshold
VRHOT
Delay
VRHOT
Output On-Resistance
VRHOT
Leakage Current
THRM Input Leakage
Thermal-Shutdown Threshold
Current-Limit Threshold Voltage
(Positive Adjustable)
Current-Limit Threshold Voltage
(Positive Default) Preset
Current-Limit Threshold Voltage
(Negative) Accuracy
Current-Limit Threshold Voltage
(Zero Crossing)
CSP, CSN Common-Mode
Input Range
CSP, CSN Input Current
ILIM Input Current
DC Droop Amplifier (GMD) Offset
DC Droop Amplifier (GMD)
Transconductance
T
A
= +25°C
T
A
= +25°C
(V
CSP
- V
CSN
) at I
FB
= 0
I
FB
/ (V
CSP
- V
CSN
); V
FB
= V
CSN
= 0.45V to
2.0V, and (V
CSP
- V
CSN
) = -15.0mV to +15.0mV
t
VRHOT
R
VRHOT
I
VRHOT
I
THRM
T
SHDN
Measured at THRM with respect to V
CC
;
falling edge; typical hysteresis = 100mV
THRM forced 25mV below the
VRHOT
trip
threshold; falling edge
Low state
High state,
VRHOT
forced to 5V, T
A
= +25°C
V
THRM
= 0V to 5V, T
A
= +25°C
Typical hysteresis = 15°C
V
TIME
- V
ILIM
= 100mV
V
TIME
- V
ILIM
= 500mV
7
45
20
-4
1
0
-0.2
-100
-0.75
592
600
2
+0.2
+100
+0.75
608
-100
+160
10
50
22.5
13
55
25
+4
29.2
30
10
2
8
1
+100
µA
nA
°C
30.8
%
µs
V
UVLO(VCC)
SYMBOL
CONDITIONS
IMVP-6.5:
CLKEN
pullup to 3.3V with 1.9k ;
I
SINK
= 3mA
IMVP-6.5: V
PGDIN
= 5V, V
CLKEN
= 3.3V
IMVP-6.5: V
SHDN
= GND, V
CLKEN
= 3.3V
I
SINK
= 3mA
High state, PWRGD forced to 5V, T
A
= +25°C
Rising edge, 65mV typical hysteresis,
controller disabled below this level
SHDN
= GND and drivers disabled
(not switching)
4.05
4.27
8
2
0.01
MIN
TYP
MAX
0.4
4
1
0.4
1
4.48
UNITS
V
µA
µA
V
µA
V
VALLEY CURRENT LIMIT AND DROOP
V
LIMIT
V
CSP
- V
CSN
mV
mV
mV
mV
V
µA
nA
mV
µS
V
CSP
- V
CSN,
ILIM = V
CC
V
LIMIT(NEG)
V
CSP
- V
CSN
, nominally -125% of V
LIMIT
V
ZERO
V
PGND
- V
LX
, SKIP = V
CC
4
_______________________________________________________________________________________
1-Phase Quick-PWM
Intel IMVP-6.5/GMCH Controllers
ELECTRICAL CHARACTERISTICS (continued)
(Circuit of Figure 1, V
IN
= 12V, V
DD
= V
CC
= 5V,
CLKEN
pullup to 3.3V with 1.9kΩ,
SHDN
=
SLOW
= ILIM = PGDIN = V
CC
, SKIP =
GNDS = PGND = GND, V
FB
= V
CSP
= V
CSN
= 1.200V, D0–D6 set for 1.20V (D0–D6 = 0001100).
T
A
= 0°C to +85°C,
unless otherwise
specified. Typical values are at T
A
= +25°C.) (Note 2)
PARAMETER
GATE DRIVERS
DH Gate-Driver On-Resistance
DL Gate-Driver On-Resistance
DH Gate-Driver Source Current
DH Gate-Driver Sink Current
DL Gate-Driver Source Current
DL Gate-Driver Sink Current
Driver Propagation Delay
DL Transition Time
DH Transition Time
Internal BST Switch On-Resistance
CURRENT MONITOR
Current-Monitor
Transconductance
Current-Monitor Offset
Referred to V(CSP, CSN)
IMON Clamp Voltage
LOGIC AND I/O
Logic-Input High Voltage
Logic-Input Low Voltage
Low-Voltage Logic-
Input High Voltage
Low-Voltage Logic-
Input Low Voltage
Logic-Input Current
CLKEN
Logic-Input High Voltage
for IMVP-6.5 Startup
CLKEN
Logic-Input Low Voltage
for GMCH
V
IH
V
IL
V
IHLV
V
ILLV
PGDIN
PGDIN
SHDN,
SKIP,
SLOW,
D0–D6
SHDN,
SKIP,
SLOW,
D0–D6
PGDIN,
SHDN,
SKIP,
SLOW,
D0–D6 = 0 or
5V, T
A
= +25°C
-1
2.3
1.0
0.67
0.33
+1
2.3
1.0
V
V
V
V
µA
V
V
V
IMON
G
m(IMON)
I
IMON
/ (V
CSP
- V
CSN
),
V
CSN
= 0.45V to 2.0V
I
IMON
= 0
I
IMON
= -1mA
4.9
-1.0
1.05
1.10
5.0
5.1
+1.0
1.15
mS
mV
V
R
BST
R
ON(DH)
R
ON(DL)
BST - LX forced
to 5V
High state (pullup)
Low state (pulldown)
DH forced to 2.5V, BST - LX forced to 5V
DL forced to 2.5V
DH low to DL high
DL low to DH high
DL falling, C
DL
= 3nF
DL rising, C
DL
= 3nF
DH falling, C
DH
= 3nF
DH rising, C
DH
= 3nF
I
BST
= 10mA, V
DD
= 5V (Note 6)
High state (pullup)
Low state (pulldown)
0.9
0.7
0.7
0.25
2.2
2.7
2.7
8
20
20
20
20
20
20
10
20
2.5
2.0
2.0
0.7
A
A
A
A
ns
ns
ns
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
MAX17528
I
DH(SOURCE)
DH forced to 2.5V, BST - LX forced to 5V
I
DH(SINK)
I
DL(SINK)
I
DL(SOURCE)
DL forced to 2.5V
_______________________________________________________________________________________
5
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