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MAX1544ETL
Dual-Phase / Quick-PWM Controller for AMD Hammer CPU Core Power Supplies
General DescriptionThe MAX1544 is a dual-phase, Quick-PWM™, step-
down controller for AMD Hammer™ 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 MAX1544 includes active
voltage positioning with adjustable gain and offset,
reducing power dissipation and bulk output capacitance
requirements.
The MAX1544 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 MAX1544 complies with AMD’s desktop and
mobile CPU specifications. The switching regulator fea-
tures soft-start and power-up sequencing, and
soft-shutdown. The MAX1544 also features indepen-
dent four-level logic inputs for setting the suspend volt-
age (S0–S1).
The MAX1544 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. Additionally, the
MAX1544 includes selectable overvoltage protection.
The MAX1544 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 MAX1519/MAX1545
and MAX1532/MAX1546/MAX1547 data sheets.
ApplicationsAMD Hammer Desktop or Notebook PCs
Multiphase CPU Core Supply
Voltage-Positioned Step-Down Converters
Servers/Desktop Computers
FeaturesDual-Phase, Quick-PWM Controller±0.75% VOUTAccuracy Over Line, Load, and
Temperature (1.3V)Active Voltage Positioning with Adjustable Gain
and Offset5-Bit On-Board DAC: 0.675V to 1.55V Output
Adjust RangeSelectable 100kHz/200kHz/300kHz/550kHz
Switching Frequency4V to 28V Battery Input Voltage RangeAdjustable Slew-Rate ControlDrives Large Synchronous Rectifier MOSFETsSelectable Output Overvoltage ProtectionUndervoltage and Thermal-Fault ProtectionPower Sequencing and TimingSelectable Suspend VoltageSoft-ShutdownSelectable Single- or Dual-Phase Pulse Skipping
MAX1544
AMD Hammer CPU Core Power Supplies
Pin Configuration
Ordering InformationQuick-PWM is a trademark of Maxim Integrated Products, Inc.
Hammer is a trademark of AMD.
MAX1544
Dual-Phase, Quick-PWM Controller for
AMD Hammer CPU Core Power Supplies
ABSOLUTE MAXIMUM RATINGSStresses 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.
V+ to GND..............................................................-0.3V to +30V
VCCto GND..............................................................-0.3V to +6V
VDDto PGND............................................................-0.3V to +6VSKIP, SUS, D0–D4 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, OVP to GND....-0.3V to (VCC+ 0.3V)
SHDNto 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
ELECTRICAL CHARACTERISTICS(Circuit of Figure 1, V+ = 15V, VCC= VDD= VSHDN= VTON= VSKIP= VS0= VS1= VOVP= 5V, VFB= VCMP= VCMN= VCSP= VCSN=
1.3V, OFS = SUS = GNDS = D0–D4 = GND; TA
= 0°C to +85°C, unless otherwise specified. Typical values are at TA= +25°C.)
Note 1:SHDNmay be forced to 12V for the purpose of debugging prototype boards using the no-fault test mode, which disables
fault protection and overlapping operation.
MAX1544
Dual-Phase, Quick-PWM Controller for
AMD Hammer CPU Core Power Supplies
ELECTRICAL CHARACTERISTICS (continued)(Circuit of Figure 1, V+ = 15V, VCC= VDD= VSHDN= VTON= VSKIP= VS0= VS1= VOVP= 5V, VFB= VCMP= VCMN= VCSP= VCSN=
1.3V, OFS = SUS = GNDS = D0–D4 = GND; TA
= 0°C to +85°C, unless otherwise specified. Typical values are at TA= +25°C.)
MAX1544
Dual-Phase, Quick-PWM Controller for
AMD Hammer CPU Core Power Supplies
ELECTRICAL CHARACTERISTICS (continued)(Circuit of Figure 1, V+ = 15V, VCC= VDD= VSHDN= VTON= VSKIP= VS0= VS1= VOVP= 5V, VFB= VCMP= VCMN= VCSP= VCSN=
MAX1544
Dual-Phase, Quick-PWM Controller for
AMD Hammer CPU Core Power Supplies
ELECTRICAL CHARACTERISTICS (continued)(Circuit of Figure 1, V+ = 15V, VCC= VDD= VSHDN= VTON= VSKIP= VS0= VS1= VOVP= 5V, VFB= VCMP= VCMN= VCSP= VCSN=
