19-2870; Rev 0; 04/03 MAXIM
MAX1MAX1544/MAX1545 Evaluation Kits544/MAX1545 Evaluation Kits
MAXIM 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.
________________________________________________________________________________________________________________General DescriptionGeneral Description
The MAX1544/MAX1545 evaluation kits (EV kits)
demonstrate the high-power, dynamically adjustable
multiphase notebook CPU application circuit. This DC-DC
converter steps down high-voltage batteries and/or AC
adapters, generating a precision, low-voltage CPU core
VCC rail. The MAX1544 EV kit meets the mobile and
desktop AMD Hammer CPU transient voltage
specification. The MAX1545 EV kit meets the desktop and
mobile Pentium 4 (P4) CPUs transient voltage
specification. The MAX1544/MAX1545 kits consist of the
MAX1544 or MAX1545 Dual-Phase Quick-PWM™ step-
down controller, two MAX1980 slave controllers and the
MAX6590 temperature sensor. The MAX1544/MAX1545
kits include active voltage positioning with adjustable gain
and offset, reducing power dissipation and bulk output
capacitance requirements. The kit features independent
four-level logic inputs for setting the suspend voltage
(S0/S1).
The MAX1980 provides additional gate drive circuitry,
phase synchronization, current limit, and current
balancing. Precision slew-rate control provides “just-in
time” arrival at the new DAC setting, minimizing surge
currents to and from the battery.
This fully assembled and tested circuit board provides a 5-
bit digitally adjustable output voltage from a 7V to 24V
battery input range. The EV kit operates at 300kHz
switching frequency and has superior line- and load-
transient response.
Pentium is a registered trademark of Intel Corp.
Hammer is a trademark of Advanced Micro Devices, Inc.
QuickPWM is a trademark of Maxim Integrated Products, Inc.
__________________________________________________________________________________________________________________________________________________________________________________FeaturesFeatures
♦ Quad-Phase Quick-PWMTM EV Kit
♦ Mobile and Desktop P4 or AMD Hammer
Compatible
♦ Active Voltage Positioning with Adjustable Gain,
Offset and Remote Sensing
♦ High Speed, Accuracy and Efficiency
♦ Low Bulk Output Capacitor Count
♦ Multiphase Fast-Response Quick-PWM
Architecture
MAX1544/MAX1545 Dual-Phase Controller
Two MAX1980 Slave Controllers
♦ 7V to 24V Input Voltage Range
♦ 5-Bit On-Board DAC
Mobile P4: 0.60V to 1.75V Output Range
Desktop P4: 1.10V to 1.85V Output Range
AMD Hammer: 0.675V to 1.55V Output Range
♦ 68A Load-Current Capability (17A Each Phase)
♦ 300kHz Switching Frequency
♦ MAX6509 Temperature Sensor
♦ 40-Pin Thin QFN Package (MAX1544/MAX1545)
♦ 20-Pin Thin QFN Package (MAX1980)
♦ Fully Assembled and Tested
______________________________________________________________________Ordering InformationOrdering Information
PART TEMP RANGE IC PACKAGE
MAX1544EVKIT
MAX1545EVKIT 0°C to +70°C 40 QFN (MAX154_)
20 QFN (MAX1980)
Evaluates: MAX1544/MAX1545
Evaluates: MAX1544/MAX1545
______________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________Component ListComponent List
DESIGNATION QTY DESCRIPTION
C1-C4, C7, C20,
C25, C26, C33,
C35, C62, C64 0 Not Installed (0603)
C5, C24, C36,
C49 4 100pF 5% 50V C0G ceramic
capacitor (0603)
Murata GRM1885C1H101J
C6, C21, C23,
C38, C39, C51,
C60 7 0.22µF 16V X5R ceramic capacitor
(0805)
Taiyo Yuden EMK212BJ224KG
DESIGNATION QTY DESCRIPTION
C8-C12, C31,
C32, C47 8 330µF, 2.5V 9mΩ Low-ESR
polymer capacitor (D case)
Sanyo 2R5TPE330M9
or or
C8-C12, C31,
C32, C47 8 330µF, 2V 7mΩ Low-ESR specialty
polymer capacitor (D case)
Panasonic EEFSD0D331XR
C13 0 Not installed (E case)
C14, C29, C58,
C59 4 1000pF 10% 50V C0G ceramic
capacitor (0603)
Murata GRM188R71H102K
MAX1MAX1544/544/MAX1545 Evaluation KitsMAX1545 Evaluation Kits
2 MAXIM
________________________________________________________________________________________________________________________________________________________________________________________________________________ Component List (continued) Component List (continued)
Evaluates: MAX1544/MAX1545
Evaluates: MAX1544/MAX1545
DESIGNATION QTY DESCRIPTION
C15, C22, C34,
C45 4
4700pF 10% 50V X7R ceramic
capacitor (0603)
Murata GRM188R71H472K
(Not installed when using
Si7442DP)
C16 1 2.2µF 10V X5R ceramic capacitor
(0612)
TDK C1632X5R1A225KTB09N
C17, C18, C19,
C41, C42, C43,
C53, C54, C65 9 15µF 20% 25V X5R ceramic
capacitor (1812)
TDK C4532X5R1E156M
C27, C40, C52 3
1µF 20% 10V X5R ceramic
capacitor (0805)
Taiyo Yuden LMK212BJ105KG or
TDK C2012X7R1C105MKT
C28 1 47pF 5% 50V C0G ceramic
capacitor (0603)
Murata GRM1885C1H470J
C30, C37, C50,
C56, C63 5 470pF 10% 50V X7R ceramic
capacitor (0603)
Murata GRM188R71H471K
C44, C48, C55,
C57 4 1µF 10% 25V X7R ceramic
capacitor (0805)
TDK C2012X7R1E105K
C61 1 0.1µF 10% 50V X7R ceramic
capacitor (0805)
Murata GRM21BR71H104K
C67, C69, C70,
C83, C84, C85,
C87, C97-C101 12
10µF 20% 6.3V X5R ceramic
capacitor (0805)
TDK C2012X5R0J106M or
Taiyo Yuden AMK212BJ106MG
C71-C78, C80-
C82, C88-C92 16 22µF 6.3V X5R ceramic capacitor
(1206)
TDK C3216X5R0J226MT
D1 1 100mA, 30V Dual Schottky Diode
Central Semiconductor
CMPSH-3A
D2, D3, D4, D12 4 5A Schottky Diode
Central Semiconductor
CMSH5-40
D5, D13 2 100mA, 30V Schottky Diode
Central Semiconductor
CMPSH-3
D6, D11 2 200mA Switching Diode
Central Semiconductor CMPD2838
D7, D10 0
Not Installed
100mA, 30V Dual Schottky Diode
Central Semiconductor
CMPSH-3C
J2 1 4-pin header
Molex 39-29-3046
JUA0-JUA5 6 2-pin header
JU1, JU3, JU4 3 4-pin header
JU13 0 2-pin header
DESIGNATION QTY DESCRIPTION
JU2 1 3-pin header
L1-L4 4 0.6µH 26A 0.9mΩ Power Inductors
Panasonic ETQP1H0R6BFA or
Sumida CDEP134H-0R6
N1, N2, N5, N6,
N7, N10, N15,
N16 8
N-channel MOSFET (SO-8)
International Rectifier IRF7811W
or
Fairchild FDS6694
or or
N2, N7, N10,
N16 4 Vishay/Siliconix Si7886DP
(Power PAK)
N3, N4, N8, N9,
N11, N12, N13,
N14 8
N-channel MOSFET (SO-8)
International Rectifier IRF7822 or
Fairchild FDS6688 or
Vishay/Siliconix Si7442DP
(Power PAK)
Q1, Q2 2 N-channel MOSFET
Central Semiconductor 2N7002
R1, R8, R11,
R14, R15, R17,
R20, R37, R50,
R52, R63, R64,
R78, R98, R102
0 Not Installed, (short PC trace)
(0603)
R2, R9, R39,
R45 4 0.001Ω ±1% 1W resistor (2512)
Panasonic ERJM1WTF1M0U
R3, R33-R35,
R40, R44, R46,
R48, R49, R107 10 100Ω ±5% resistor (0603)
R5, R6, R18,
R24 4 1kΩ ±1% resistor (0603)
R7 1 60.4kΩ ±1% resistor (0603)
R10 1 100kΩ ±1% resistor (0603)
R12 1 20kΩ ±1% resistor (0603)
R16, R83, R84 3 10Ω ±5% resistor (0603)
R19, R21, R27,
R30, R36, R51,
R53, R61, R62,
R65-R67, R74,
R75, R81, R87,
R92, R99-R101,
R103-R106,
R108, R109
0 Not Installed (0603)
R26, R28, R73,
R76, R77, R79,
R80 7 0Ω ±5% resistor (0603)
R29, R31 2 30.1kΩ ±1% resistor (0603)
R32, R42 2 150kΩ ±1% resistor (0603)
R41, R47 2 20Ω ±5% resistor (0603)
R43, R38 2 10kΩ ±5% resistor (0603)
R54-R59, R70,
R95-R97, R110 11 100kΩ ±5% resistor (0603)
R60 1 11kΩ ±1% resistor (0603)
R82 1 1MΩ ±5% resistor (0603)
U2, U3 2 MAX1980ETP (20-TQFN)
MAX1MAX1544/MAX1545 Evaluation Kits544/MAX1545 Evaluation Kits
MAXIM 3
________________________________________________________________________________________________________________________________________________________________Quick StartQuick Start
Recommended Equipment
• 7V to 24V, >1
00W power supply, battery, or notebook
AC adapter
• DC bias power supply, 5V at 1A
• One or more dummy loads capable of sinking 68A total
• Digital multimeter (DMM)
• 100MHz dual-trace oscilloscope Procedure
1)
Ensure that the circuit is connected correctly to the
supplies and dummy load prior to applying any power.
2)
Verify that the shunts are across JU1 pins 1 and 3 (S0)
and JU3 pins 1 and 4 (S1), JU2 pins 1 and 2 (SHDN
)
and JU4 pins 1 and 3 (TON). The DAC code settings
(D4–D0) are set for 1.50V output through instal
led
jumpers JUA3 and JUA1. A fixed +50mV offset fsets the
final no load output voltage at 1.55V for the MAX1544
EV kit. A fixed -
25mV offset sets the final no load output
voltage at 1.45V for the MAX5145 EV kit.
3) Turn on the battery power before turning on
the +5V bias
power; otherwise, the output UVLO timer times out and
the FAULT latch is set, disabling the regulator until +5V
power is cycled or shutdown is toggled.
4)
Observe the output voltage with the DMM and/or
oscilloscope. Look at the LX switching nodes
and
MOSFET gate-
drive signals while varying the load
current.
__________________________________________________________________________________________________________Detailed DescriptionDetailed Description
This 68A multiphase buck-
regulator design is optimized for a
300kHz frequency and output voltage settings from 1.0V to
1.5V. At VOUT=1.5V and VIN=12V, the inductor ripple is
approximately 30% (LIR=0.3). The MAX1544/MAX1545
controller shares the current between its two phases that
operate 180° out-of-
phase, supplying 17A per phase. Each
MAX1980 slave is triggered by one sid
e of the
MAX1544/MAX1545 low-
side gate driver, supplying another
17A per slave.
____________________________________________________________________________________________________________________________________________________________________________________________________________________Component List (continued)Component List (continued)
DESIGNATION QTY DESCRIPTION
U4 1 MAX6509HAUK-T (5-SOT23)
U5 0 MAX6509HAUK-T (5-SOT23)
None 10 Shunts
None 1 MAX1544/MAX1545 PC Board
MAX1544 EV KitMAX1544 EV Kit
__________________________________________________________ Additional Components Additional Components
DESIGNATION QTY DESCRIPTION
R4, R23 2 2.61kΩ ±1% resistor (0603)
R22 1 24.9kΩ ±1% resistor (0603)
R25 1 100kΩ ±1% resistor (0603)
U1 1 MAX1544ETL (40-TQFN)
U8 1 Socket 754
DESIGNATION QTY DESCRIPTION
None 1 MAX1544/MAX1545 EV kit data
sheet
None 1 MAX1544/MAX1545 data sheet
None 1 MAX1980 data sheet
None 1 MAX6509 data sheet
MAX1545 EV KitMAX1545 EV Kit
____________________________________________________ Additional Components* Additional Components*
DESIGNATION QTY DESCRIPTION
R4, R23 2 3.01kΩ ±1% resistor (0603)
R22 1 182kΩ ±1% resistor (0603)
R25 1 20kΩ ±1% resistor (0603)
U1 1 MAX1545ETL (40-TQFN)
U8 1 None
*Contact Intel for the Mobile P4 specifications and contact
Maxim for a reference schematic.
______________________________________________________________________________________________________________________________________________________________________________________________________________________________________________Component SuppliersComponent Suppliers
SUPPLIER PHONE FAX WEBSITE
Central Semiconductor 516-435-1110 516-435-1824 www.centralsemi.com
Fairchild Semiconductor 408-721-2181 408-721-1635 www.fairchildsemi.com
International Rectifier 310-322-3331 310-322-3332 www.irf.com
Panasonic 714-373-7939 714-373-7183 www.panasonic.com
Sumida 708-956-0666 708-956-0702 www.sumida.com
Taiyo Yuden 408-573-4150 408-573-4159 www.t-yuden.com
TDK 847-390-4373 847-390-4428 www.component.tdk.com
Vishay/Siliconix 203-268-6261 203-268-6296 www.vishay.com
Note: Please indicate that you are using the MAX1544 and MAX1545 when contacting these component suppliers.
Evaluates: MAX1544/MAX1545
Evaluates: MAX1544/MAX1545
MAX1MAX1544/544/MAX1545 Evaluation KitsMAX1545 Evaluation Kits
4 MAXIM
Setting the Output Voltage
The MAX1544/MAX1545 has two unique internal VID input
multiplexers that can select one of three different VID DAC
code settings for different process
or states. On startup, the
controller selects the DAC code from the D0–
D4 input
decoder when SUS=GND. A second multiplexer selects the
lower S0-
S1 DAC code when SUS is high (SUS=3.3V or
VCC), or the higher S0-
S1 DAC code when SUS=REF. The
output voltage can be digitally set by the D0-
D4 pins (Table
1) or the S0-S1 pins (Table 2).
There are five different ways of setting the output voltage:
1) Drive the external VID0–
VID4 inputs (no jumpers
installed):
The output voltage can be set by driving
VID0–VID4 with open-
drain drivers (pullup resistors are
included on the board) or 3V/5V CMOS output logic
levels (DPSLPVR = GND).
2) Install jumpers JUA0–JUA4: SUS=low. When JUA0
–
JUA4 are not installed, the MAX1544/MAX1545’s D0
–
D4 inputs are at logic 1 (connected to VID_VCC).
When
JUA0–JUA4 are installed, D0–
D4 inputs are at logic 0
(connected to GND). The output voltage can be
changed during operation by installing and removing
jumpers JUA0–
JUA4. As shipped, the EV kit is
configured with jumpers JUA0–
JUA4 set for 1.50V
output
(Table 1). Refer to the MAX1544 and MAX1545
data sheets for more information.
3) Drive DPSLPVR (suspend mode configuration):
As
shipped, the EV kit is configured for operation in the
suspend mode S0-S1 set for 1.000V output (Table 2).
4) Drive DPSLPDPSLP: DPSLP can
be driven by an external
driver to introduce offsets to the output voltage (Table
2).
5) Drive header J1 for full system control: VID0-
VID4,
DPSLP
, DPRSLPVR, VRON, and VROK are all
available directly on header connections J1 (Figure 1c).
Do not install jumper JU2 in this mode.
Evaluates: MAX1544/MAX1545
Evaluates: MAX1544/MAX1545
Table 1. MAX1544/MAX1545 Output Voltage Adjustment Settings (SUS=GND)
D4
D3
D2
D1
D0
MAX1544
VOUT (V)
MAX1545
CODE=VCC
VOUT (V)
MAX1545
CODE=GND
VOUT (V) D4
D3
D2
D1
D0
MAX1544
VOUT (V)
MAX1545
CODE=VCC
VOUT (V)
MAX1545
CODE=GND
VOUT (V)
0 0 0 0 0 1.550 1.750 1.850 1 0 0 0 0 1.150 0.975 1.450
0 0 0 0 1 1.525 1.700 1.825 1 0 0 0 1 1.125 0.950 1.425
0 0 0 1 0 1.500 1.650 1.800 1 0 0 1 0 1.100 0.925 1.400
0 0 0 1 1 1.475 1.600 1.775 1 0 0 1 1 1.075 0.900 1.375
0 0 1 0 0 1.450 1.550 1.750 1 0 1 0 0 1.050 0.875 1.350
0 0 1 0 1 1.425 1.500 1.725 1 0 1 0 1 1.025 0.850 1.325
0 0 1 1 0 1.400 1.450 1.700 1 0 1 1 0 1.000 0.825 1.300
0 0 1 1 1 1.375 1.400 1.675 1 0 1 1 1 0.975 0.800 1.275
0 1 0 0 0 1.350 1.350 1.650 1 1 0 0 0 0.950 0.775 1.250
0 1 0 0 1 1.325 1.300 1.625 1 1 0 0 1 0.925 0.750 1.225
0 1 0 1 0 1.300 1.250 1.600 1 1 0 1 0 0.900 0.725 1.200
0 1 0 1 1 1.275 1.200 1.575 1 1 0 1 1 0.875 0.700 1.175
0 1 1 0 0 1.250 1.150 1.550 1 1 1 0 0 0.850 0.675 1.150
0 1 1 0 1 1.225 1.100 1.525 1 1 1 0 1 0.825 0.650 1.125
0 1 1 1 0 1.200 1.050 1.500 1 1 1 1 0 0.800 0.625 1.100
0 1 1 1 1 1.175 1.000 1.475 1 1 1 1 1 OFF 0.600 OFF
MAX1MAX1544/MAX1545 Evaluation Kits544/MAX1545 Evaluation Kits
MAXIM 5
Table 2. MAX1544/MAX1545 Output Voltage Adjustment Settings (SUS=High or REF)
LOWER SUSPEND CODES UPPER SUSPEND CODES
SUS* S1 S0 VOUT (V) SUS* S1 S0 VOUT (V)
High GND GND 0.675 REF GND GND 1.075
High GND REF 0.700 REF GND REF 1.100
High GND OPEN 0.725 REF GND OPEN 1.125
High GND VCC 0.750 REF GND VCC 1.150
High REF GND 0.775 REF REF GND 1.175
High REF REF 0.800 REF REF REF 1.200
High REF OPEN 0.825 REF REF OPEN 1.225
High REF VCC 0.850 REF REF VCC 1.250
High OPEN GND 0.875 REF OPEN GND 1.275
High OPEN REF 0.900 REF OPEN REF 1.300
High OPEN OPEN 0.925 REF OPEN OPEN 1.325
High OPEN VCC 0.950 REF OPEN VCC 1.350
High VCC GND 0.975 REF VCC GND 1.375
High VCC REF 1.000 REF VCC REF 1.400
High VCC OPEN 1.025 REF VCC OPEN 1.425
High VCC VCC 1.050 REF VCC VCC 1.450
*Note: Connect the 3-level SUS input to a 2.7V or greater supply (3.3V or VCC) for an input logic level high.
Table 3. MAX1544/MAX1545 Operating Mode Truth Table
SHDNSHDN SUS SKIPSKIP OFS OUTPUT
VOLTAGE OPERATING MODE
GND x x x GND Low-Power Shutdown Mode. DL_ is forced high, DH_ is forced low,
and the PWM controller is disabled. The supply current drops to 1µA
(typ).
VCC GND VCC GND or REF D0-D4
(No offset) Normal Operation. The no load output voltage is determined by the
selected VID DAC code (D0-D4, Table 1).
VCC x REF GND or REF D0-D4
(No offset)
Dual-Phase Pulse Skipping Operation. When SKIP is set to 2V, the
MAX1544/MAX1545 immediately enters dual-phase pulse skipping
operation allowing automatic PWM/PFM switchover under light loads.
Both MAX1980 slaves are disabled. The VROK upper threshold is
blanked.
VCC x GND GND or REF D0-D4
(No offset)
Single-Phase Pulse Skipping Operation. When SKIP is pulled to GND,
the MAX1544/MAX1545 immediately enters single-phase pulse
skipping operation allowing automatic PWM/PFM switchover under
light loads. Both MAX1980 slaves are disabled. The VROK upper
threshold is blanked.
VCC GND x 0 to 0.8V
or
1.2V to 2.0V
D0-D4
(Plus offset)
Deep Sleep Mode. The no load output voltage is determined by the
selected VID DAC code (D0-D4, Table 1) plus the offset voltage set by
OFS.
VCC REF
or
High x x SUS, S0-S1
(Offset
disabled)
Suspend Mode. The no load output voltage is determined by the
selected suspend code (SUS, S0-S1, Table 2), overriding all other
active modes of operation.
VCC x x x GND Fault Mode. The fault latch has been set by either UVP, OVP (if
enabled), or thermal shutdown. The controller will remain in FAULT
mode until VCC power is cycled or SHDN toggled.
Evaluates: MAX1544/MAX154
Evaluates: MAX1544/MAX1545
5
MAX1MAX1544/544/MAX1545 Evaluation KitsMAX1545 Evaluation Kits
6 MAXIM
Evaluates: MAX1544/MAX1545
Evaluates: MAX1544/MAX1545
Reduced Power Dissipation
Voltage Positioning
The MAX1544/MAX1545 EV kit uses voltage positioning to
decrease the size of the output capacitor and to reduce
power dissipation at heavy loads. Current-sense resistors (R2
and R9=1mΩ) are used to sense the inductor current and
adjust the output voltage. The current-sense resistors
dissipate some power but the net power savings are
substantial. This EV kit further improves efficiency by using
an internal op-amp gain stage to allow a reduction in the
sense resistor value.
The MAX1544 op amp is configured for a gain of 2.5 (only 2
phases sensed) providing a -1.25mV/A voltage-positioning
slope at the output when all four phases are active. The
MAX1545 op amp is configured for a gain of 3 providing a
slope of -1.5mV/A. Remote output and ground sensing
eliminate any additional PC board voltage drops.
Dynamic Output Voltage
Transition Experiment
Observe the output voltage transition between 1.00V and
1.50V by setting jumpers JUA0–JUA4 to 1.50V and toggling
the SUS input between GND and VCC, respectively. This is
the worst-case transition and should complete within 100µs.
This EV kit is set to transition the output voltage at 1-LSB per
2µs. The speed of the transition can be altered by changing
resistor R7 (60.4kΩ).
During the voltage transition, watch the inductor current by
looking across R2 and/or R9 with a differential scope probe or
by inserting a current probe in series with the inductor.
Observe the low, well-controlled inductor current that
accompanies the voltage transition. The same slew rate and
controlled inductor current are used during shutdown and
startup, resulting in well-controlled currents into and out of the
battery (input source).
There are two other methods to create an output voltage
transition. Select D0–D4 (JUA0–JUA4). Then either manually
change the JUA0–JUA4 jumpers to a new VID code setting
(Table 1), or remove all jumpers and drive the VID0–VID4 PC
board test points externally to the desired code settings.
Load-Transient Experiment
One interesting experiment is to subject the output to large,
fast load transients and observe the output with an
oscilloscope. This necessitates careful instrumentation of the
output, using the supplied scope-probe jack. Accurate
measurement of output ripple and load-transient response
invariably requires that ground clip leads be completely
avoided and that the probe must be removed to expose the
GND shield, so the probe can be plugged directly into the
jack. Otherwise, EMI and noise pickup corrupt the
waveforms.
Most benchtop electronic loads intended for power supply
testing lack the ability to subject the DC-DC converter to ultra-
fast load transients. Emulating the supply current di/dt at the
CPU VCORE pins requires at least 10A/µs load transients.
One easy method for generating such an abusive load
transient is to solder a power MOSFET directly across the
scope-probe jack. Then drive its gate with a strong pulse
generator at a low duty cycle (< 5%) to minimize heat stress
in the MOSFET. Vary the high-level output voltage of the
pulse generator to vary the load current.
To determine the load current, you might expect to insert a
meter in the load path, but this method is prohibited here by
the need for low resistance and inductance in the path of the
dummy load MOSFET. There are two easy alternative
methods of determining how much load current a particular
pulse-generator amplitude is causing. The easiest method is
to observe the currents through inductors L1 and L2 with a
calibrated AC current probe, such as a Tektronix AM503, or
by looking across R2 and R9 with a differential probe. In the
buck topology, the load current is approximately equal to the
average value of the inductor currents. TON Settings
Jumper JU4 selects the MAX1544/MAX1545 switching
frequency.
Note: Always set the MAX1980 slaves to the same switching
frequency as the MAX1544/MAX1545.
Note: When changing the switching frequency, recalculate
the inductor and output capacitor values using the equations
in the MAX1544/MAX1545 and MAX1980 datasheets.
Table 4. Jumper JU4 Function (TON Setting)
SHUNT POSITION TON PIN MAX1544/MAX1545 SWITCHING FREQUENCY
1 and 2 Connected to GND 550kHz. Short R104 and R108 to set the MAX1980s to 550kHz.
1 and 3 (Default) Connected to REF 300kHz.
1 and 4 Connected to VCC 200kHz. Short R105 and R109 to set the MAX1980s to 200kHz.
Not installed VR_ON driven by
external signal 100kHz. Not supported by MAX1980. Disable MAX1980 when setting
MAX1544/MAX1545 at 100kHz for highest suspend mode efficiency.
Table 5. PIN19 Function and Setting
PIN 19 MAX1544 (OVP PIN) MAX1545 (CODE PIN)
High Overvoltage Protection Enabled Selects Mobile P4 VID code set
Low Overvoltage Protection Disabled Selects Desktop P4 VID code set
MAX1MAX1544/MAX1545 Evaluation Kits544/MAX1545 Evaluation Kits
MAXIM 7
VOUT_SENSE
CMP
MAX1544
VCC V+
R16
10Ω
VDD
CMN
CSN
CSP
OAIN+
OAIN-
FB
DLM
LXM
DHM
BSTM
DLS
LXS
DHS
BSTS
PGND
D0
D1
D2
D3
D4
SHDN
SKIP
DPRSLPVR SUS
TON
REF
C28
47pF CCV
ILIM
TIME
R7
60.4kΩ 1%
S0
S1
C23
0.22µF
R10
100kΩ 1%
VID0
VID1
VID2
VID3
VID4
REF
VCC
JU3 4
2
3 1
R70
100kΩ
R73
0Ω
R12
20kΩ 1% C24
100pF
VCC VDD
C27
1µF
10V
R97
100kΩ
C15
4700pF
DLM
L1
0.6µH R2
0.001Ω
C10
330µF
2.5V
C11
330µF
2.5V C13
OPEN
VOUT
GND
CM-
CM+
R53
OPEN C1
OPEN
LM1
C22
4700pF
DLS
L2
0.6µH R9
0.001Ω
C8
330µF
2.5V
C12
330µF
2.5V
CS-
CS+
R81
OPEN C2
OPEN
LM2
C26
OPEN
R17
SHORT (PC TRACE)
R15
SHORT (PC TRACE)
CM+
CM-
C25
OPEN
R14
SHORT (PC TRACE)
R11
SHORT (PC TRACE)
CS-
CS+
CS+
CM+
R4*
2.49kΩ 1%
R5
1kΩ 1%
R6
1kΩ 1%
15 CS-
CM-
R18
1kΩ 1%
R24
1kΩ 1%
R23*
2.49kΩ 1%
C7
OPEN
C30
470pF
R20
SHORT
(PC TRACE) R82
1MΩ
CCI 14
JU1 4
2
3 1
REF
VCC
JU4 4
2
3 1
VOUT
GND
VCC
R77
0Ω
SKIP
OFS
C63
470pF
REF
DPSLP#
VOUT
Q1
2N7002
R22*
182kΩ 1%
R25*
20kΩ
1%
R19
OPEN
R21
OPEN
VR_ON JU2 2
3
1
VCC
VCC=100kHz
OPEN=200kHz
REF=300kHz
GND=550kHz
GND
GNDS
C5
100pF
R3
100Ω
GND_SENSE
DPRSLPVR R76
0ΩC20
OPEN
Q2
2N7002
DISABLE
R84
10Ω
GND_SENSE
GND_SENSE
R83
10Ω
VOUT_SENSE
VOUT_SENSE VOUT
20
18
11
13
12
17
16
5
10
9
8
1
3
2
4
7
6
25
30
29
28
21
22
24
27
26
23
35
40
39
38
31
33
32
34
37
36
C6
0.22µF
R8
SHORT
(PC TRACE)
DHS
BSTS
C21
0.22µF
DHM
R1
SHORT
(PC TRACE)
VBIAS
C16
2.2µF
10V
N3
5
13
2
4
7 68
D3
N4 DLM
C44
1µF
25V
C48
1µF
25V
VBATT
VBATT
N1 N2 DHM
1
5
13
2
4
7 68
5
3
2
4
76 8
5
3
2
4
76 8
N8
5
13
2
4
7 68
D2
N9 DLS
C55
1µF
25V
C57
1µF
25V
VBATT
N6 N7 DHS
1
5
13
2
4
7 68
5
3
2
4
76 8
5
3
2
4
76 8
3
BSTS
D1
CMPSH-3A
21
U1*
(BACKSIDE PAD IS
CONNECTED TO GND)
R50
SHORT
(PC TRACE)
R78
SHORT
(PC TRACE)
AGND1 AGND2
VROK VROK
C18
15µF
25V
C19
15µF
25V
C17
15µF
25V
C65
15µF
25V
VOUT
VOUT
REF
REF
+5V
7V TO 24V
C56
470pF
PIN 19PIN 19 19
MAX1544
MAX1545 OVP
CODE
PIN 19
* See MAX1545 EV Kit Additional Components for Desktop P4 Solution.
Evaluates: MAX1544/MAX1545
Evaluates: MAX1544/MAX1545
Figure 1a. MAX1544 EV Kit Schematic (Sheet 1 of 3)
MAX1MAX1544/544/MAX1545 Evaluation KitsMAX1545 Evaluation Kits
8 MAXIM
Evaluates: MAX1544/MAX1545
Evaluates: MAX1544/MAX1545
VDD
BST
DH
LX
DL
PGND
GND
CS+
CS-
VCC VDD
V+
VCC1
POL
LIMIT
CM+
CM-
TON
ILIM
MAX1980
COMP
D5
CMPSH-3
D6
CMPD2838
R43
10kΩ
C37
470pF
15
20
19
18
11
13
12
14
17 16
5
10
9
8
1
3
2
4
7
6
DISABLE
C40
1µF
10V
C34
4700pF
DLS1
L3
0.6µH R45
0.001Ω
C9
330µF
2.5V
C32
330µF
2.5V
VOUT
GND
CS1-
CS1+
R87
OPEN C3
OPEN
LS1
R47 20Ω
C14
1000pF
CS1+
CS1-
R35 100Ω
R34 100Ω
C29
1000pF
CM+
CM-
R46 100Ω
R33 100Ω
CM+
C38
0.22µF
VCC1
R104
OPEN
R105
OPEN
VCC1
R103
OPEN
R102
SHORT
(PC TRACE)
DHS1
C39
0.22µF
R37
SHORT
(PC TRACE)
R29
30.1kΩ
1%
C36
100pF
R42
150kΩ 1%
REF
TRIG
R62
OPEN
C33
OPEN
R27
OPEN
R26
0Ω
DLM
DLS
D7
BAT54A
OPEN
N12
5
13
2
4
7 68
D4
N11 DLS1
C41
15µF
25V
C42
15µF
25V
VBATT
N5 N10 DHS1
1
5
13
2
4
7 68
5
3
2
4
76 8
5
3
2
4
76 8
DD
VBATT
VDD
VCC1
R36
OPEN
R100
OPEN
R79 00ΩAGND1
AGND1
AGND1
AGND1
3
1
2
U2
(BACKSIDE
PAD IS
CONNECTED
TO AGND1)
AGND1
VCC=200kHz
OPEN=300kHz
GND=550kHz
VDD
BST
DH
LX
DL
PGND
GND
CS+
CS-
VCC VDD
V+
VCC2
POL
LIMIT
CM+
CM-
TON
ILIM
MAX1980
COMP
D13
CMPSH-3
D11
CMPD2838
R38
10kΩ
C50
470pF
15
20
19
18
11
13
12
14
17 16
5
10
9
8
1
3
2
4
7
6
DISABLE
C52
1µF
10V
C45
4700pF
DLS2
L4
0.6µH R39
0.001ΩVOUT
GND
CS2-
CS2+
R92
OPEN C4
OPEN
LS2
R41 20Ω
C59
1000pF
CS2+
CS2-
R49 100Ω
R48 100Ω
C58
1000pF
CS+
CS-
R40 100Ω
R44 100Ω
CS+
C60
0.22µF
VCC2
R108
OPEN
R109
OPEN
VCC2
R99
OPEN
R98
SHORT
(PC TRACE)
DHS2
C51
0.22µF
R52
SHORT
(PC TRACE)
R31
30.1kΩ
1%
C49
100pF
R32
150kΩ 1%
REF
TRIG
R65
OPEN
C35
OPEN
R28
0Ω
R30
OPEN
DLM
DLS
D10
BAT54A
OPEN
N13
5
13
2
4
7 68
D12
N14 DLS2
C53
15µF
25V
C54
15µF
25V
VBATT
N15 N16 DHS2
1
5
13
2
4
7 68
5
3
2
4
76 8
5
3
2
4
76 8
DD
VBATT
VDD
VCC2
R51
OPEN
R106
OPEN
R80 0ΩAGND2
AGND2
AGND2
AGND2
3
1
2
U3
(BACKSIDE
PAD IS
CONNECTED
TO AGND2)
AGND2
VCC=200kHz
OPEN=300kHz
GND=550kHz
AGND2
AGND1
VOUT
VOUT
C31
330µF
2.5V
C47
330µF
2.5V
Figure 1b. MAX1544 EV Kit Schematic (Sheet 2 of 3)
MAX1MAX1544/MAX1545 Evaluation Kits544/MAX1545 Evaluation Kits
MAXIM 9
1
3
2
4
J2 C43
15µF
25V
VBATT
MAX6509
HYST
GND
VCC
SET
R66
OPEN
OUT
VDD
C62
OPEN
R101
OPEN
VRHOT#
U5 R67
OPEN
R64
SHORT
(PC TRACE)
5
1
3
2
4
OPEN
MAX6509
HYST
GND
VCC
SET
R61
OPEN
OUT
VDD
C61
0.1µF
R107
100Ω
VRHOT#
U4 R60
11kΩ 1%
R63
SHORT
(PC TRACE)
5
1
3
2
4
VDD
JU13
VID_VCC
JUA0
R54
100kΩVID0
VID0
JUA1
R55
100kΩVID1
VID1
JUA2
R56
100kΩVID2
VID2
JUA3
R57
100kΩVID3
VID3
JUA4
R58
100kΩVID4
VID4
JUA5
R59
100kΩPIN 19
PIN 19
VOUT
C69
10µF C70
10µF C83
10µF C84
10µF C85
10µF
VOUT
C97
10µF C98
10µF C99
10µF C100
10µF C101
10µF
VOUT
C71
22µF C72
22µF C73
22µF C74
22µF C75
22µF C76
22µF C77
22µF C78
22µF
VOUT
C80
22µF C81
22µF C82
22µF C88
22µF C89
22µF C90
22µF C91
22µF C92
22µF
GND
VR_ON VR_ON
DPRSLPVR DPRSLPVR
R110
100kΩ
VDD
DPSLP# DPSLP#
R95
100kΩ
R96
100kΩ
VRHOT# VRHOT#
VROK VROK
VBIAS
+5V
MAX1544
MAX1545 OVP
CODE
PIN 19
Evaluates: MAX1544/MAX1545
Evaluates: MAX1544/MAX1545
Figure 1c. MAX1544 EV Kit Schematic (Sheet 3 of 3)
MAX1MAX1544/544/MAX1545 Evaluation KitsMAX1545 Evaluation Kits
10 MAXIM
Evaluates: MAX1544/MAX1545
Evaluates: MAX1544/MAX1545
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29
A1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 A
B30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 B
C59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 C
D88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 D
E117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 E
F146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 F
G175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 G
H204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 H
J233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 J
K262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 K
L291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 L
M311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 M
N331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 N
P351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 P
R371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 R
T391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 T
U411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 U
V431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 V
W451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 W
Y471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 Y
AA 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 AA
AB 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 AB
AC 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 AC
AD 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 AD
AE 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 AE
AF 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 AF
AG 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 AG
AH 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 AH
AJ 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 AJ
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29
GND A24 GND_SENSE AE15 VID[0]
VOUT A23 VOUT_SENSE AF15 VID[1]
AG14 VID[2]
AF14 VID[3]
AG13 VID[4]
Figure 3. CPU Socket (U8) pinout
MAX1MAX1544/MAX1545 Evaluation Kits544/MAX1545 Evaluation Kits
MAXIM 11
Evaluates: MAX1544/MAX1545
Evaluates: MAX1544/MAX1545
Figure 4. MAX1544/MAX1545 EV Component Placement Guide - Top Side
MAX1MAX1544/544/MAX1545 Evaluation KitsMAX1545 Evaluation Kits
12 MAXIM
Evaluates: MAX1544/MAX1545
Evaluates: MAX1544/MAX1545
Figure 5. MAX1544/MAX1545 EV Kit Component Placement Guide - Bottom Side
MAX1MAX1544/MAX1545 Evaluation Kits544/MAX1545 Evaluation Kits
MAXIM 13
Evaluates: MAX1
Evaluates: MAX1544/MAX1545
544/MAX1545
Figure 6. MAX1544/MAX1545 EV Kit PC Board Layout – Top Side
MAX1MAX1544/544/MAX1545 Evaluation KitsMAX1545 Evaluation Kits
14 MAXIM
Evaluates: MAX1544/MAX1545
Evaluates: MAX1544/MAX1545
Figure 7. MAX1544/MAX1545 EV Kit PC Board Layout – GND Layer 2
MAX1MAX1544/MAX1545 Evaluation Kits544/MAX1545 Evaluation Kits
MAXIM 15
Evaluates: MAX1544/MAX1545
Evaluates: MAX1544/MAX1545
Figure 8. MAX1544/MAX1545 EV Kit PC Board Layout – Signal Layer 3
MAX1MAX1544/544/MAX1545 Evaluation KitsMAX1545 Evaluation Kits
16 MAXIM
Evaluates: MAX1544/MAX1545
Evaluates: MAX1544/MAX1545
Figure 9. MAX1544/MAX1545 EV Kit PC Board Layout – Layer 4
MAX1MAX1544/MAX1545 Evaluation Kits544/MAX1545 Evaluation Kits
MAXIM 17
Evaluates: MAX1544/MAX1545
Evaluates: MAX1544/MAX1545
Figure 10. MAX1544/MAX1545 EV Kit PC Board Layout – Layer 5
MAX1MAX1544/544/MAX1545 Evaluation KitsMAX1545 Evaluation Kits
18 MAXIM
Evaluates: MAX1544/MAX1545
Evaluates: MAX1544/MAX1545
Figure 11. MAX1544/MAX1545 EV Kit PC Board Layout – Layer 6
MAX1MAX1544/MAX1545 Evaluation Kits544/MAX1545 Evaluation Kits
MAXIM 19
Evaluates: MAX1544/MAX1545
Evaluates: MAX1544/MAX1545
Figure 12. MAX1544/MAX1545 EV Kit PC Board Layout – Layer 7
MAX1MAX1544/544/MAX1545 Evaluation KitsMAX1545 Evaluation Kits
20 MAXIM
Evaluates: MAX1544/MAX1545
Evaluates: MAX1544/MAX1545
Figure 13. MAX1544/MAX1545 EV Kit PC Board Layout – Bottom Layer
