CONFIDENTIAL INFORMATION – RESTRICTED TO INTEL
®
IMVP-6 LICENSEES
19-3913; Rev 0; 10/05
MAX8770/MAX8771/MAX8772 Dual-Phase, Quick-
PWM Controller for IMVP-6+ CPU Core Power Supplies
General Description
The MAX8770/MAX8771/MAX8772 are 2/1-phase inter-
leaved Quick-PWM™ step-down VID power-supply con-
trollers for notebook CPUs. True out-of-phase operation
reduces input ripple current requirements and output volt-
age ripple while easing component selection and layout
difficulties. The Quick-PWM control provides instanta-
neous 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 out-
put capacitors.
The MAX8770/MAX8771/MAX8772 are intended for two
different notebook CPU core applications: either bucking
down the battery directly to create the core voltage, or
else bucking down the +5V system supply. The single-
stage conversion method allows this device 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 possi-
ble physical size.
A slew-rate controller allows controlled transitions
between VID codes, controlled soft-start and shutdown,
and controlled exit from suspend. A thermistor-based
temperature sensor provides a programmable thermal-
fault output (VRHOT). A power-monitor output (POUT)
provides an analog voltage output proportional to the
power consumed by the CPU. The MAX8770/MAX8771/
MAX8772 include output undervoltage protection (UVP)
and thermal protection, and the MAX8770/MAX8771 also
include overvoltage protection (OVP). When any of these
protection features detect a fault, the controller shuts
down. A voltage-regulator power-OK (PWRGD) output
indicates the output is in regulation. A clock enable
(CLKEN) output provides proper system startup sequenc-
ing. Additionally, the MAX8771 has a phase-good
(PHASEGD) output, and the MAX8770/MAX8772 includes
true differential current sense.
The MAX8770/MAX8771/MAX8772 implement the Intel
IMVP-6+ code set and the required IMVP-6+ control sig-
nals. The MAX8770/MAX8771/MAX8772 are available in a
40-pin TQFN package.
Features
♦
Single/Dual-Phase, Quick-PWM Controller
♦
±0.4%
V
OUT
Accuracy Over Line, Load, and
Temperature
♦
7-Bit On-Board DAC: 0 to +1.5000V Output Adjust
Range
♦
Dynamic Phase Selection Optimizes Active/Sleep
Efficiency
♦
Transient Phase Overlap Reduces Output
Capacitance
♦
Integrated Boost Switches
♦
Active Voltage Positioning with Adjustable Gain
♦
Programmable 200kHz to 600kHz Switching
Frequency
♦
Accurate Current Balance and Current Limit
♦
Adjustable Slew-Rate Control
♦
Power-Good (PWRGD), Clock Enable (CLKEN),
Power Monitor (POUT) and Thermal Fault
(VRHOT) Outputs
♦
Phase Fault (PHASEGD) Output (MAX8771)
♦
Drives Large Synchronous Rectifier MOSFETs
♦
4V to 26V Battery-Input-Voltage Range
♦
Output OV Protection (MAX8770/MAX8771)
♦
UV and Thermal-Fault Protection
♦
Power Sequencing and Timing
♦
Soft-Startup and Soft-Shutdown
MAX8770/MAX8771/MAX8772
Ordering Information
PART
TEMP
PIN-PACKAGE
MAX8770GTL+ -40°C to +105°C 40 Thin QFN 6mm x 6mm
MAX8771GTL+ -40°C to +105°C 40 Thin QFN 6mm x 6mm
MAX8772GTL+ -40°C to +105°C 40 Thin QFN 6mm x 6mm
+Denotes
lead-free package.
Applications
IMVP-6+ Core Supply
Multiphase CPU Core Supply
Voltage-Positioned, Step-Down Converters
Notebook/Desktop Computers
Blade Servers
Intel is a registered trademark of Intel, Corp.
Quick-PWM is a trademark of Maxim Integrated Products, Inc.
________________________________________________________________
Maxim Integrated Products
1
Pin Configuration appears at end of data sheet.
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
CONFIDENTIAL INFORMATION – RESTRICTED TO INTEL
®
IMVP-6 LICENSEES
MAX8770/MAX8771/MAX8772 Dual-Phase, Quick-
PWM Controller for IMVP-6+ CPU Core Power Supplies
MAX8770/MAX8771/MAX8772
ABSOLUTE MAXIMUM RATINGS
V
CC
, V
DD
to GND .....................................................-0.3V to +6V
D0–D6, CSP_ to GND...............................................-0.3V to +6V
CSN12 (MAX8771) to GND ......................................-0.3V to +6V
CSN_ (MAX8770/MAX8772) to GND........................-0.3V to +6V
PHASEGD (MAX8771) to GND.................................-0.3V to +6V
THRM,
VRHOT, CLKEN
to GND...............................-0.3V to +6V
TIME, PWRGD, POUT to GND ......................-0.3V to V
CC
+ 0.3V
REF, FB, CCV, CCI to GND ..........................-0.3V to V
CC
+ 0.3V
SHDN
to GND (Note 1)...........................................-0.3V to +14V
TON to GND ...........................................................-0.3V to +30V
DPRSLPVR,
DPRSTP, PSI
to GND ...........................-0.3V to +6V
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
REF Short Circuit to GND ...........................................Continuous
Continuous Power Dissipation
40-Pin 6mm x 6mm Thin QFN
(derate 23.2mW/°C above +70°C) .............................2051mW
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
may be forced to 12V for the purpose of debugging prototype boards using the no-fault test mode, which disables
fault protection and disables overlapping operation.
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
DD
= V
CC
= V
SHDN
= V
PSI
= V
DPRSTP
= 5V, DPRSLPVR = GNDS = PGND_ = GND, V
FB
= V
CCI
= 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.)
PARAMETER
PWM CONTROLLER
Input Voltage Range
V
CC
, V
DD
DAC codes from
0.8375V to 1.500V
DC Output-Voltage Accuracy
V
OUT
Includes load-
regulation error
(Note 2)
DAC codes from
0.500V to 0.825V
DAC codes below
0.4875V
Boot Voltage
GNDS Input Range
GNDS Gain
GNDS Input Bias Current
FB Input Bias Current
On-Time Accuracy (Note 3)
TON Shutdown Input Current
Minimum FB and CCI Voltages
for Pseudo-Fixed-Frequency
Operation
Minimum Off-Time
t
OFF(MIN)
V
BOOT
V
GNDS
A
GNDS
I
GNDS
I
FB
t
ON
CSP_ = CSN_ for both enabled phases
V
IN
= 12V
V
FB
= V
CCI
= 1.2V
R
TON
= 96.75kΩ
R
TON
= 200kΩ
R
TON
= 303.25kΩ
∆V
OUT
/∆V
GNDS
, -200mV
≤
V
GNDS
≤
+200mV
4.5
-0.4
-4
-10
1.19
-200
0.95
-25
-2
142
300
425
167
333
500
0.01
0.2
300
1.00
-15
1.20
5.5
+0.4
+4
mV
+10
1.21
+200
1.05
+2
+2
192
366
575
0.1
0.25
375
µA
V
ns
ns
V
mV
V/V
µA
µA
V
%
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
SHDN
= 0, V
IN
= 26V, V
CC
= V
DD
= 0 or 5V
Switching frequency is reduced if FB and/or
CCI are less than this value
(Note 3)
2
_______________________________________________________________________________________
CONFIDENTIAL INFORMATION – RESTRICTED TO INTEL
®
IMVP-6 LICENSEES
MAX8770/MAX8771/MAX8772 Dual-Phase, Quick-
PWM Controller for IMVP-6+ CPU Core Power Supplies
ELECTRICAL CHARACTERISTICS (continued)
(Circuit of Figure 1. V
DD
= V
CC
= V
SHDN
= V
PSI
= V
DPRSTP
= 5V, DPRSLPVR = GNDS = PGND_ = GND, V
FB
= V
CCI
= 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.)
PARAMETER
SYMBOL
CONDITIONS
R
TIME
= 71.5kΩ (12.5mV/µs nominal)
R
TIME
= 35.7kΩ (25mV/µs nominal) to 178kΩ
(5mV/µs nominal)
TIME Slew-Rate Accuracy
DPRSTP
= high, DPRSLPVR = high,
R
TIME
= 35.7kΩ to 178kΩ, SR = 6.25mV/µs
nominal to 1.25mV/µs nominal
Startup and shutdown, R
TIME
= 35.7kΩ
(3.125mV/µs nominal) to 178kΩ
(0.625mV/µs nominal)
BIAS AND REFERENCE
Quiescent Supply Current (V
CC
)
Quiescent Supply Current (V
DD
)
Shutdown Supply Current (V
CC
)
Shutdown Supply Current (V
DD
)
Reference Voltage
Reference Load Regulation
FAULT PROTECTION
Measured at FB with respect to unloaded
output voltage; rising edge;
PWM mode or skip mode after output reaches
the regulation voltage
V
OVP
Measured at FB;
rising edge
Skip mode and output
have not reached the
regulation voltage
Minimum OVP threshold
Output Overvoltage-
Propagation Delay
(MAX8770/MAX8771 Only)
Output Undervoltage
Protection Threshold
Output Undervoltage
Propagation Delay
CLKEN
Startup Delay
(Boot Time Period)
t
OVP
FB forced 25mV above trip threshold
Measured at FB with respect to unloaded
output voltage
FB forced 25mV below trip threshold
Measured from the time when FB reaches the
boot target voltage based on the slew rate set
by R
TIME
I
CC
I
DD
I
CC(SHDN)
I
DD(SHDN)
V
REF
∆V
REF
Measured at V
CC
, FB forced above the
regulation point, DPRSLPVR = V
CC
Measured at V
DD
, FB forced above the
regulation point, DPRSLPVR = V
CC
Measured at V
CC
,
SHDN
= GND
Measured at V
DD
,
SHDN
= GND
V
CC
= 4.5V to 5.5V, I
REF
= 0
I
REF
= 0 to 500µA
I
REF
= -100µA to 0
1.986
-2
5
0.01
0.01
0.01
2.000
-0.2
0.21
6.2
10
1
1
1
2.014
mA
µA
µA
µA
V
mV
MIN
-10
-15
TYP
MAX
+10
+15
UNITS
MAX8770/MAX8771/MAX8772
-20
+20
%
-20
+20
250
300
350
mV
Output Overvoltage Protection
Threshold
(MAX8770/MAX8771 Only)
1.75
1.80
0.8
10
1.85
V
µs
V
UVP
t
UVP
-450
-400
10
-350
mV
µs
t
BOOT
20
60
100
µs
_______________________________________________________________________________________
3
CONFIDENTIAL INFORMATION – RESTRICTED TO INTEL
®
IMVP-6 LICENSEES
MAX8770/MAX8771/MAX8772 Dual-Phase, Quick-
PWM Controller for IMVP-6+ CPU Core Power Supplies
MAX8770/MAX8771/MAX8772
ELECTRICAL CHARACTERISTICS (continued)
(Circuit of Figure 1. V
DD
= V
CC
= V
SHDN
= V
PSI
= V
DPRSTP
= 5V, DPRSLPVR = GNDS = PGND_ = GND, V
FB
= V
CCI
= 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.)
PARAMETER
PWRGD, PHASEGD Startup
Delay
SYMBOL
t
PWRGD
CONDITIONS
Measured at startup from the time when
CLKEN
goes low
Measured at FB with
respect to unloaded
output voltage
15mV hysteresis (typ)
CLKEN,
PWRGD, PHASEGD
Delay
CLKEN,
PWRGD, PHASEGD
Transition Blanking Time
PHASEGD Transition Blanking
Time
t
BLANK
Lower threshold, falling
edge (undervoltage)
Upper threshold, rising
edge (overvoltage)
MIN
3
TYP
5
MAX
8
UNITS
ms
-350
-300
-250
mV
CLKEN,
PWRGD Threshold
+150
+200
10
+250
µs
FB forced 25mV outside the PWRGD trip
thresholds
Measured from the time when FB reaches the
target voltage based on the slew rate set by
R
TIME
Number of DH2 pulses from when phase 2 is
enabled
V(CCI, FB),
0.4V
≤
V(FB)
≤
1.5V
15mV hysteresis (typ)
Lower threshold,
0.6V
FB
nominal
Upper threshold,
1.4V
FB
nominal
-20
-20
20
µs
t
PHASEGD
32
+20
Cycles
PHASEGD Window
Comparator Thresholds
CLKEN,
PWRGD, PHASEGD
Output Low Voltage
CLKEN,
PWRGD, PHASEGD
Leakage Current
VRHOT
Trip Threshold
VRHOT
Delay
VRHOT
Output On-Resistance
VRHOT
Leakage Current
THRM Input Leakage
V
CC
Undervoltage Lockout
Threshold
V
CC
Power-On Reset
Threshold
Thermal Shutdown Threshold
T
SHDN
V
UVLO(VCC)
t
VRHOT
R
VRHOT
mV
+20
0.4
1
29.5
30
10
3.5
-100
11
1
+100
4.25
4.45
30.5
V
µA
%
µs
Ω
µA
nA
V
I
SINK
= 3mA
High state,
CLKEN,
PWRGD, PHASEGD forced
to 5V
Measured at THRM, with respect to V
CC
; falling
edge, 115mV hysteresis (typ)
THRM forced 25mV below the
VRHOT
trip
threshold; falling edge
Low state
High state.
VRHOT
forced to 5V
Rising edge, 50mV hysteresis, DL_ pulled low
below this level
Falling edge, typical hysteresis = 1.1V, faults
cleared and DL_ forced high when V
CC
falls
below this level
Hysteresis = 15°C
4.1
1.8
160
V
°C
4
_______________________________________________________________________________________
CONFIDENTIAL INFORMATION – RESTRICTED TO INTEL
®
IMVP-6 LICENSEES
MAX8770/MAX8771/MAX8772 Dual-Phase, Quick-
PWM Controller for IMVP-6+ CPU Core Power Supplies
ELECTRICAL CHARACTERISTICS (continued)
(Circuit of Figure 1. V
DD
= V
CC
= V
SHDN
= V
PSI
= V
DPRSTP
= 5V, DPRSLPVR = GNDS = PGND_ = GND, V
FB
= V
CCI
= 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.)
PARAMETER
DROOP AND BALANCE
DC Droop Amplifier Offset
DC Droop Amplifier
Transconductance
Current-Balance
Preamplifier Offset
Current-Balance Amplifier
Transconductance
CURRENT LIMIT
Valley Current-Limit Threshold
(Positive)
Valley Current-Limit Threshold
(Negative)
Zero Crossing Threshold
Current-Sense Input Current
Common-Sense Common-Mode
Input Range
Phase 2 Disable Threshold
Gate Drivers
GATE DRIVERS
DH_ Gate Driver
On-Resistance
DL_ Gate Driver
On-Resistance
DH_ Gate Driver Source/Sink
Current
DL_ Gate Driver Source Current
DL_ Gate Driver Sink Current
Driver Propagation Delay
DL_ Transition Time
DH_ Transition Time
R
ON(DH_)
R
ON(DL_)
I
DH
BST_ -LX_ forced
to 5V
High state (pullup)
Low state (pulldown)
DH_ forced to 2.5V, BST_ - LX_ forced to 5V
High state (pullup)
Low state (pulldown)
0.9
0.7
0.7
0.25
2.2
2.7
8
18
9
25
20
20
20
20
20
2.5
2.5
2.0
0.5
Ω
Ω
A
A
A
ns
ns
ns
V
ZX
V
LIMIT
CSP_ - CSN_
CSP_, CSN_
PGND1 - LX1, DPRSLPVR = high (skip mode)
CSP_
CSN_
CSN12 (MAX8771)
CSP_ -CSN_
CSP2
3
-0.2
-0.2
-0.4
0
19.5
-35
22.5
-30
2.5
+0.2
+0.2
+0.4
2
V
V
CC
- 1 V
CC
- 0.4
µA
25.5
-25
mV
mV
mV
G
m(CCI)
G
m(FB)
∆I
FB
/(Σ∆V
CS
),
V
FB
= V
CSN
_ = 1.2V,
V
CSP
_ - V
CSN
_ = 0 to +60mV
[V(CSP1, CSN_) - V(CSP2, CSN_)] at I
CCI
= 0
∆
I
CCI
/∆ [V(CSP1, CSN_), V(CSP2, CSN_)]
CCI = FB = CSN_ = 0.45V to 1.5V, and
V(CSP_, CSN_) = -10mV to +10mV
-1.0
590
600
+1.0
610
mV
µS
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
MAX8770/MAX8771/MAX8772
-1.0
+1.0
mV
200
µS
I
DL(SOURCE)
DL_ forced to 2.5V
I
DL(SINK)
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
_______________________________________________________________________________________
5
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