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19-3721; Rev 0; 5/05
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Dual-Phase, Quick-PWM Controller for AMD
Mobile Turion 64 CPU Core Power Supplies
General Description
The MAX8760 is a dual-phase, Quick-PWM™, step-
down controller for 6-bit VID AMD Mobile Turion™ 64
CPU core supplies. Dual-phase operation reduces input
ripple current requirements and output voltage ripple
while easing component selection and layout difficulties.
The quick-PWM control scheme provides instantaneous
response to fast-load current steps. The MAX8760
includes active voltage positioning with adjustable gain
and offset, reducing power dissipation and bulk output
capacitance requirements.
The MAX8760 is intended for two different notebook CPU
core applications: stepping down the battery directly or
stepping down the 5V system supply to create the core
voltage. The single-stage conversion method allows this
device to directly step down high-voltage batteries for the
highest possible efficiency. Alternatively, two-stage con-
version (stepping down the 5V system supply instead of
the battery) at a higher switching frequency provides the
minimum possible physical size.
The MAX8760 complies with AMD’s desktop and mobile
CPU specifications. The switching regulator features soft-
start and power-up sequencing, and soft-shutdown. The
MAX8760 also features independent four-level logic inputs
for setting the suspend voltage (S0, S1).
The MAX8760 includes output undervoltage protection,
thermal protection, and voltage regulator power-OK
(VROK) output. When any of these protection features
detect a fault, the controller shuts down.
The MAX8760 is available in a low-profile, 40-pin 6mm x
6mm thin QFN package. For other CPU platforms, refer to
the pin-to-pin compatible MAX1544, MAX1519/MAX1545,
and MAX1532/MAX1546/MAX1547 data sheets.
Applications
6-Bit VID AMD Mobile Turion 64 CPU
Multiphase CPU Core Supply
Voltage-Positioned Step-Down Converters
Servers/Desktop Computers
Features
Dual-Phase, Quick-PWM Controller
±0.75% VOUT Accuracy Over Line, Load, and
Temperature (1.3V)
Active Voltage Positioning with Adjustable Gain
and Offset
6-Bit On-Board DAC: 0.375V to 1.55V Output
Adjust Range
Selectable 100kHz/200kHz/300kHz/550kHz
Switching Frequency
4V to 28V Battery Input Voltage Range
Adjustable Slew-Rate Control
Drives Large Synchronous Rectifier MOSFETs
Undervoltage and Thermal-Fault Protection
Power Sequencing and Timing
Selectable Suspend Voltage
Soft-Start and Soft-Shutdown
Selectable Single- or Dual-Phase Pulse Skipping
Ordering Information
PART
TEMP RANGE
MAX8760ETL -40°C to +100°C
MAX8760ETL+ -40°C to +100°C
+Denotes lead-free package.
PIN-PACKAGE
40 Thin QFN 6mm x 6mm
40 Thin QFN 6mm x 6mm
Pin Configuration
TOP VIEW
30 29 28 27 26 25 24 23 22 21
PGND
DLS
DHS
LXS
BSTS
V+
CMP
CMN
CSN
CSP
31
32
33
34
35
36
37
38
39
40
MAX8760
1 2 3 4 5 6 7 8 9 10
20 D4
19 D5
18 SKIP
17 OAIN+
16 OAIN-
15 FB
14 CCI
13 GNDS
12 CCV
11 GND
Quick-PWM is a trademark of Maxim Integrated Products, Inc.
Turion is a trademark of AMD.
THIN QFN
________________________________________________________________ Maxim Integrated Products 1
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.

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Dual-Phase, Quick-PWM Controller for AMD
Mobile Turion 64 CPU Core Power Supplies
ABSOLUTE MAXIMUM RATINGS
V+ to GND ..............................................................-0.3V to +30V
VCC to GND ..............................................................-0.3V to +6V
VDD to PGND............................................................-0.3V to +6V
SKIP, SUS, D0–D5 to GND.......................................-0.3V to +6V
ILIM, FB, OFS, CCV, CCI, REF, OAIN+,
OAIN- to GND.........................................-0.3V to (VCC + 0.3V)
CMP, CSP, CMN, CSN, GNDS to GND ......-0.3V to (VCC + 0.3V)
TON, TIME, VROK, S0–S1 to GND..............-0.3V to (VCC + 0.3V)
SHDN to GND (Note 1)...........................................-0.3V to +18V
DLM, DLS to PGND ....................................-0.3V to (VDD + 0.3V)
BSTM, BSTS to GND ..............................................-0.3V to +36V
DHM to LXM ...........................................-0.3V to (VBSTM + 0.3V)
LXM to BSTM............................................................-6V to +0.3V
DHS to LXS..............................................-0.3V to (VBSTS + 0.3V)
LXS to BSTS .............................................................-6V to +0.3V
GND to PGND .......................................................-0.3V to +0.3V
REF Short-Circuit Duration .........................................Continuous
Continuous Power Dissipation (TA = +70°C)
40-Pin 6mm 6mm Thin QFN
(derate 23.2mW/°C above +70°C) ...............................1.860W
Operating Temperature Range .........................-40°C to +100°C
Junction Temperature ......................................................+150°C
Storage Temperature Range .............................-65°C to +150°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 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+ = 15V, VCC = VDD = V SHDN = V SKIP = VS0 = VS1 = 5V, VFB = VCMP = VCMN = VCSP = VCSN = 1.3V, OFS =
SUS = GNDS = D0–D5 = GND, TA = 0°C to +85°C, unless otherwise specified. Typical values are at TA = +25°C.)
PARAMETER
PWM CONTROLLER
Input Voltage Range
DC Output Voltage Accuracy
(Note 2)
SYMBOL
CONDITIONS
Battery voltage, V+
VCC, VDD
V+ = 4.5V to 28V,
includes load
regulation error
DAC codes 1V
DAC codes from
0.375V to 1V
MIN TYP MAX UNITS
4 28
V
4.5 5.5
-10 +10
mV
-15 +15
Line Regulation Error
Input Bias Current
OFS Input Range
IFB, IGNDS
IOFS
VCC = 4.5V to 5.5V, V+ = 4.5V to 28V
FB, GNDS
OFS
5 mV
-2 +2
µA
-0.1 +0.1
0 2V
OFS Gain
GNDS Input Range
GNDS Gain
TIME Frequency Accuracy
AOFS
VOUT/VOFS;
VOFS = VOFS, VOFS = 0 to 1V
VOUT/VOFS;
VOFS = VOFS - VREF, VOFS = 1V to 2V
AGNDS
fTIME
VOUT/VGNDS
1000kHz nominal, RTIME = 15k
500kHz nominal, RTIME = 30k
250kHz nominal, RTIME = 60k
Startup and shutdown, RTIME = 30k
-0.129 -0.125 -0.117
-0.129 -0.125 -0.117
-20 +200
0.97 0.99 1.01
900 1000 1100
460 500 540
225 250 275
125
V/V
mV
V/V
kHz
2 _______________________________________________________________________________________

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Dual-Phase, Quick-PWM Controller for AMD
Mobile Turion 64 CPU Core Power Supplies
ELECTRICAL CHARACTERISTICS (continued)
(Circuit of Figure 1, V+ = 15V, VCC = VDD = V SHDN = V SKIP = VS0 = VS1 = 5V, VFB = VCMP = VCMN = VCSP = VCSN = 1.3V, OFS =
SUS = GNDS = D0–D5 = GND, TA = 0°C to +85°C, unless otherwise specified. Typical values are at TA = +25°C.)
PARAMETER
SYMBOL
CONDITIONS
MIN TYP MAX UNITS
TON = GND
(550kHz)
155 180 205
On-Time (Note 3)
tON
V+ = 12V,
VFB = VCCI = 1.2V
TON = REF
(300kHz)
TON = open
(200kHz)
320 355 390
475 525 575
ns
TON = VCC
(100kHz)
920 1000 1140
Minimum Off-Time (Note 3)
BIAS AND REFERENCE
TON = GND
tOFF(MIN)
TON = VCC, open, or REF
300 375
400 480
ns
Quiescent Supply Current (VCC)
ICC
Measured at VCC, FB forced above the
regulation point, OAIN- = FB, VOAIN+ = 1.3V
1.70 3.20
mA
Quiescent Supply Current (VDD)
IDD
Measured at VDD, FB forced above the
regulation point
<1 5
µA
Quiescent Battery Supply Current
(V+)
Shutdown Supply Current (VCC)
Shutdown Supply Current (VDD)
Shutdown Battery Supply Current
(V+)
Reference Voltage
Reference Load Regulation
FAULT PROTECTION
IV+
VREF
VREF
Measured at V+
Measured at VCC, SHDN = GND
Measured at VDD, SHDN = GND
Measured at V+, SHDN = GND,
VCC = VDD = 0V or 5V
VCC = 4.5V to 5.5V, IREF = 0
IREF = -10µA to 100µA
25 40
4 10
<1 5
<1 5
1.990 2.000 2.010
-10 +10
µA
µA
µA
µA
V
mV
Output Overvoltage Protection
Threshold
VOVP
2.00 V
Output Overvoltage Propagation
Delay
tOVP
FB forced 2% above trip threshold
10 µs
Output Undervoltage Protection
Threshold
VUVP
Measured at FB with respect to unloaded
output voltage
67
70
73
%
Output Undervoltage Propagation
Delay
tUVP
FB forced 2% below trip threshold
10 µs
VROK Threshold
Measured at FB
with respect to
unloaded output
voltage
Lower threshold
(undervoltage)
Upper threshold
(overvoltage)
SKIP = VCC
-12 -10
-8
+8 +10 +12
%
_______________________________________________________________________________________ 3

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Dual-Phase, Quick-PWM Controller for AMD
Mobile Turion 64 CPU Core Power Supplies
ELECTRICAL CHARACTERISTICS (continued)
(Circuit of Figure 1, V+ = 15V, VCC = VDD = V SHDN = V SKIP = VS0 = VS1 = 5V, VFB = VCMP = VCMN = VCSP = VCSN = 1.3V, OFS =
SUS = GNDS = D0–D5 = GND, TA = 0°C to +85°C, unless otherwise specified. Typical values are at TA = +25°C.)
PARAMETER
SYMBOL
CONDITIONS
MIN TYP MAX UNITS
Output Undervoltage Fault and
VROK Transition Blanking Time
tBLANK
Measured from the time when FB reaches
the voltage set by the DAC code; clock
speed set by RTIME (Note 4)
VROK Startup Delay
Measured from the time when FB first
reaches the voltage set by the DAC code
after startup
VROK Delay
tVROK
FB forced 2% outside the VROK trip
threshold
VROK Output Low Voltage
VROK Leakage Current
ISINK = 3mA
High state, VROK forced to 5.5V
VCC Undervoltage Lockout
Threshold
VUVLO(VCC)
Rising edge, hysteresis = 90mV, PWM
disabled below this level
Thermal-Shutdown Threshold
CURRENT LIMIT AND BALANCE
TSHDN
Hysteresis = 10°C
Current-Limit Threshold Voltage
(Positive, Default)
VLIMIT CMP - CMN, CSP - CSN; ILIM = VCC
Current-Limit Threshold Voltage
(Positive, Adjustable)
Current-Limit Threshold Voltage
(Negative)
VLIMIT
CMP - CMN, CSP - CSN VILIM = 0.2V
VILIM = 1.5V
VLIMIT(NEG)
CMP - CMN, CSP - CSN; ILIM = VCC,
SKIP = VCC
Current-Limit Threshold Voltage
(Zero Crossing)
VZERO CMP - CMN, CSP - CSN; SKIP = GND
24
357
10
0.4
1
4.0 4.25 4.4
+160
28 30 32
8 10 12
73 75 77
-41 -36 -31
1.5
Clks
ms
µs
V
µA
V
°C
mV
mV
mV
mV
CMP, CMN, CSP, CSN Input
Ranges
0 2V
CMP, CMN, CSP, CSN Input
Current
VCSP = VCSN = 0 to 5V
-2 +2 µA
Secondary Driver-Disable
Threshold
ILIM Input Current
Current-Limit Default Switchover
Threshold
VCSP
IILIM
VILIM
VILIM = 0 to 5V
3
VCC - 1
VCC -
0.4
0.1 200
3
VCC - 1
VCC -
0.4
V
nA
V
Current-Balance Offset
VOS(IBAL)
(VCMP - VCMN) - (VCSP - VCSN); ICCI = 0,
-20mV < (VCMP - VCMN) < 20mV,
1.0V < VCCI < 2.0V
-2
+2 mV
4 _______________________________________________________________________________________

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Dual-Phase, Quick-PWM Controller for AMD
Mobile Turion 64 CPU Core Power Supplies
ELECTRICAL CHARACTERISTICS (continued)
(Circuit of Figure 1, V+ = 15V, VCC = VDD = V SHDN = V SKIP = VS0 = VS1 = 5V, VFB = VCMP = VCMN = VCSP = VCSN = 1.3V, OFS =
SUS = GNDS = D0–D5 = GND, TA = 0°C to +85°C, unless otherwise specified. Typical values are at TA = +25°C.)
PARAMETER
SYMBOL
CONDITIONS
MIN TYP MAX UNITS
Current-Balance
Transconductance
Gm(IBAL)
400 µS
GATE DRIVERS
DH_ Gate-Driver On-Resistance
DL_ Gate-Driver On-Resistance
RON(DH)
RON(DL)
BST_ - LX_ forced to 5V
High state (pullup)
Low start (pulldown)
1.0 4.5
1.0 4.5
0.4 2
DH_ Gate-Driver Source/Sink
Current
IDH
DH_ forced to 2.5V,
BST_ - LX_ forced to 5V
1.6 A
DL_ Gate-Driver Sink Current
IDL(SINK) DL_ forced to 5V
DL_ Gate-Driver Source Current IDL(SOURCE) DL_ forced to 2.5V
Dead Time
tDEAD
DL_ rising
DH_ rising
VOLTAGE-POSITIONING AMPLIFIER
Input Offset Voltage
VOS
Input Bias Current
IBIAS
OAIN+, OAIN-
Op Amp Disable Threshold
VOAIN-
4A
1.6 A
35
ns
26
-1 +1
0.1 200
3
VCC - 1
VCC -
0.4
mV
nA
V
Common-Mode Input Voltage
Range
VCM
Guaranteed by CMRR test
0 2.5 V
Common-Mode Rejection Ratio
Power-Supply Rejection Ratio
Large-Signal Voltage Gain
Output Voltage Swing
Input Capacitance
Gain-Bandwidth Product
Slew Rate
Capacitive-Load Stability
LOGIC AND I/O
SHDN Input High Voltage
SHDN Input Low Voltage
SHDN No-Fault Threshold
Three-Level Input Logic Levels
Logic Input Current
D0–D5 Logic Input High Voltage
CMRR
PSRR
AOA
VOAIN+ = VOAIN- = 0 to 2.5V
VCC = 4.5V to 5.5V
RL = 1kto VCC/2
|VOAIN+ - VOAIN-| 10mV,
RL = 1kto VCC/2
VCC - VFBH
VFBL
No sustained oscillations
VIH
VIL
V SHDN
To enable no-fault mode
SUS, SKIP
SHDN, SKIP, SUS
High
REF
Low
70 115
dB
75 100
dB
80 112
dB
77 300
mV
47 200
11 pF
3 MHz
0.3 V/µs
400 pF
0.8 V
0.4 V
12 15 V
2.7
1.2 2.3 V
0.8
-1 +1 µA
1.6 V
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