19-2870; Rev 0; 04/03
MAX1544/MAX1545 Evaluation Kits
MAX1544/MAX1545
________________________________________________________
MAXIM
Features
TM
General Description
Evaluates: MAX1544/MAX1545
Evaluates: MAX1544/MAX1545
_________________________________________________________________________________________
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.
♦
♦
♦
♦
♦
♦
Quad-Phase Quick-PWM
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 Information
IC PACKAGE
40 QFN (MAX154_)
20 QFN (MAX1980)
PART
MAX1544EVKIT
MAX1545EVKIT
TEMP RANGE
0°C to +70°C
___________________________________________________________________________________________________________________________________
Component List
DESIGNATION
C1-C4, C7, C20,
C25, C26, C33,
C35, C62, C64
C5, C24, C36,
C49
C6, C21, C23,
C38, C39, C51,
C60
QTY
0
DESCRIPTION
Not Installed (0603)
100pF 5% 50V C0G ceramic
capacitor (0603)
Murata GRM1885C1H101J
DESIGNATION
C8-C12, C31,
C32, C47
or
QTY
8
or
8
0
4
DESCRIPTION
330µF, 2.5V 9mΩ Low-ESR
polymer capacitor (D case)
Sanyo 2R5TPE330M9
330µF, 2V 7mΩ Low-ESR specialty
polymer capacitor (D case)
Panasonic EEFSD0D331XR
Not installed (E case)
1000pF 10% 50V C0G ceramic
capacitor (0603)
Murata GRM188R71H102K
4
C8-C12, C31,
C32, C47
C13
7
0.22µF 16V X5R ceramic capacitor
(0805)
Taiyo Yuden EMK212BJ224KG
C14, C29, C58,
C59
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.
MAX1544/MAX1545 Evaluation Kits
MAX1544/MAX1545
Evaluates: MAX1544/MAX1545
________________________________________________________________________________________________________
Component List (continued)
QTY
1
4
DESCRIPTION
3-pin header
0.6µH 26A 0.9mΩ Power Inductors
Panasonic ETQP1H0R6BFA or
Sumida CDEP134H-0R6
N-channel MOSFET (SO-8)
International Rectifier IRF7811W
or
Fairchild FDS6694
Vishay/Siliconix Si7886DP
(Power PAK)
N-channel MOSFET (SO-8)
International Rectifier IRF7822 or
Fairchild FDS6688 or
Vishay/Siliconix Si7442DP
(Power PAK)
N-channel MOSFET
Central Semiconductor 2N7002
Not Installed, (short PC trace)
(0603)
0.001Ω ±1% 1W resistor (2512)
Panasonic ERJM1WTF1M0U
100Ω ±5% resistor (0603)
1kΩ ±1% resistor (0603)
60.4kΩ ±1% resistor (0603)
100kΩ ±1% resistor (0603)
20kΩ ±1% resistor (0603)
10Ω ±5% resistor (0603)
DESIGNATION
C15, C22, C34,
C45
QTY
4
C16
C17, C18, C19,
C41, C42, C43,
C53, C54, C65
C27, C40, C52
1
9
3
C28
C30, C37, C50,
C56, C63
C44, C48, C55,
C57
C61
C67, C69, C70,
C83, C84, C85,
C87, C97-C101
C71-C78, C80-
C82, C88-C92
D1
1
5
4
1
12
16
1
D2, D3, D4, D12
4
D5, D13
D6, D11
2
2
D7, D10
0
J2
JUA0-JUA5
JU1, JU3, JU4
JU13
1
6
3
0
DESCRIPTION
4700pF 10% 50V X7R ceramic
capacitor (0603)
Murata GRM188R71H472K
(Not installed when using
Si7442DP)
2.2µF 10V X5R ceramic capacitor
(0612)
TDK C1632X5R1A225KTB09N
15µF 20% 25V X5R ceramic
capacitor (1812)
TDK C4532X5R1E156M
1µF 20% 10V X5R ceramic
capacitor (0805)
Taiyo Yuden LMK212BJ105KG or
TDK C2012X7R1C105MKT
47pF 5% 50V C0G ceramic
capacitor (0603)
Murata GRM1885C1H470J
470pF 10% 50V X7R ceramic
capacitor (0603)
Murata GRM188R71H471K
1µF 10% 25V X7R ceramic
capacitor (0805)
TDK C2012X7R1E105K
0.1µF 10% 50V X7R ceramic
capacitor (0805)
Murata GRM21BR71H104K
10µF 20% 6.3V X5R ceramic
capacitor (0805)
TDK C2012X5R0J106M or
Taiyo Yuden AMK212BJ106MG
22µF 6.3V X5R ceramic capacitor
(1206)
TDK C3216X5R0J226MT
100mA, 30V Dual Schottky Diode
Central Semiconductor
CMPSH-3A
5A Schottky Diode
Central Semiconductor
CMSH5-40
100mA, 30V Schottky Diode
Central Semiconductor
CMPSH-3
200mA Switching Diode
Central Semiconductor CMPD2838
Not Installed
100mA, 30V Dual Schottky Diode
Central Semiconductor
CMPSH-3C
4-pin header
Molex 39-29-3046
2-pin header
4-pin header
2-pin header
DESIGNATION
JU2
L1-L4
N1, N2, N5, N6,
N7, N10, N15,
N16
or
N2, N7, N10,
N16
N3, N4, N8, N9,
N11, N12, N13,
N14
Q1, Q2
R1, R8, R11,
R14, R15, R17,
R20, R37, R50,
R52, R63, R64,
R78, R98, R102
R2, R9, R39,
R45
R3, R33-R35,
R40, R44, R46,
R48, R49, R107
R5, R6, R18,
R24
R7
R10
R12
R16, R83, R84
R19, R21, R27,
R30, R36, R51,
R53, R61, R62,
R65-R67, R74,
R75, R81, R87,
R92, R99-R101,
R103-R106,
R108, R109
R26, R28, R73,
R76, R77, R79,
R80
R29, R31
R32, R42
R41, R47
R43, R38
R54-R59, R70,
R95-R97, R110
R60
R82
U2, U3
8
or
4
8
2
0
4
10
4
1
1
1
3
0
Not Installed (0603)
7
2
2
2
2
11
1
1
2
0Ω ±5% resistor (0603)
30.1kΩ ±1% resistor (0603)
150kΩ ±1% resistor (0603)
20Ω ±5% resistor (0603)
10kΩ ±5% resistor (0603)
100kΩ ±5% resistor (0603)
11kΩ ±1% resistor (0603)
1MΩ ±5% resistor (0603)
MAX1980ETP (20-TQFN)
2
MAXIM
MAX1544/MAX1545 Evaluation Kits
MAX1544/MAX1545
__________________________________________________________________________________________________________
Component List (continued)
QTY
1
1
1
1
DESCRIPTION
MAX1544/MAX1545 EV kit data
sheet
MAX1544/MAX1545 data sheet
MAX1980 data sheet
MAX6509 data sheet
Evaluates: MAX1544/MAX1545
Evaluates: MAX1544/MAX1545
DESIGNATION
U4
U5
None
None
QTY
1
0
10
1
DESCRIPTION
MAX6509HAUK-T (5-SOT23)
MAX6509HAUK-T (5-SOT23)
Shunts
MAX1544/MAX1545 PC Board
DESIGNATION
None
None
None
None
_____________________________
MAX1544 EV Kit
Additional Components
DESCRIPTION
2.61kΩ ±1% resistor (0603)
24.9kΩ ±1% resistor (0603)
100kΩ ±1% resistor (0603)
MAX1544ETL (40-TQFN)
Socket 754
__________________________
MAX1545 EV Kit
Additional Components*
DESIGNATION
R4, R23
R22
R25
U1
U8
QTY
2
1
1
1
1
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 Suppliers
WEBSITE
www.centralsemi.com
www.fairchildsemi.com
www.irf.com
www.panasonic.com
www.sumida.com
www.t-yuden.com
www.component.tdk.com
www.vishay.com
SUPPLIER
Central Semiconductor
Fairchild Semiconductor
International Rectifier
Panasonic
Sumida
Taiyo Yuden
TDK
Vishay/Siliconix
PHONE
516-435-1110
408-721-2181
310-322-3331
714-373-7939
708-956-0666
408-573-4150
847-390-4373
203-268-6261
FAX
516-435-1824
408-721-1635
310-322-3332
714-373-7183
708-956-0702
408-573-4159
847-390-4428
203-268-6296
Note:
Please indicate that you are using the MAX1544 and MAX1545 when contacting these component suppliers.
________________________________________________________________________________
Quick Start
•
•
•
•
•
Recommended Equipment
7V to 24V, >100W 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
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.
_____________________________________________________
Procedure
Detailed Description
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 installed
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.
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 side of the
MAX1544/MAX1545 low-side gate driver, supplying another
17A per slave.
MAXIM
3
MAX1544/MAX1545 Evaluation Kits
MAX1544/MAX1545
Evaluates: MAX1544/MAX1545
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 processor 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.
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).
Drive
DPSLP: DPSLP
can be driven by an external
DPSLP
driver to introduce offsets to the output voltage (Table
2).
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.
3)
4)
5)
Table 1. MAX1544/MAX1545 Output Voltage Adjustment Settings (SUS=GND)
MAX1545
D4
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
D3
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
D2
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
D1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
D0
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
MAX1544
VOUT (V)
1.550
1.525
1.500
1.475
1.450
1.425
1.400
1.375
1.350
1.325
1.300
1.275
1.250
1.225
1.200
1.175
VOUT (V)
1.750
1.700
1.650
1.600
1.550
1.500
1.450
1.400
1.350
1.300
1.250
1.200
1.150
1.100
1.050
1.000
MAX1545
D4
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
D3
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
D2
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
D1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
D0
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
MAX1544
VOUT (V)
1.150
1.125
1.100
1.075
1.050
1.025
1.000
0.975
0.950
0.925
0.900
0.875
0.850
0.825
0.800
OFF
VOUT (V)
1.850
1.825
1.800
1.775
1.750
1.725
1.700
1.675
1.650
1.625
1.600
1.575
1.550
1.525
1.500
1.475
MAX1545
VOUT (V)
0.975
0.950
0.925
0.900
0.875
0.850
0.825
0.800
0.775
0.750
0.725
0.700
0.675
0.650
0.625
0.600
MAX1545
VOUT (V)
1.450
1.425
1.400
1.375
1.350
1.325
1.300
1.275
1.250
1.225
1.200
1.175
1.150
1.125
1.100
OFF
CODE=VCC CODE=GND
CODE=VCC CODE=GND
4
MAXIM
MAX1544/MAX1545 Evaluation Kits
MAX1544/MAX1545
Table 2. MAX1544/MAX1545 Output Voltage Adjustment Settings (SUS=High or REF)
LOWER SUSPEND CODES
SUS*
High
High
High
High
High
High
High
High
High
High
High
High
High
High
High
High
S1
GND
GND
GND
GND
REF
REF
REF
REF
OPEN
OPEN
OPEN
OPEN
VCC
VCC
VCC
VCC
S0
GND
REF
OPEN
VCC
GND
REF
OPEN
VCC
GND
REF
OPEN
VCC
GND
REF
OPEN
VCC
VOUT (V)
0.675
0.700
0.725
0.750
0.775
0.800
0.825
0.850
0.875
0.900
0.925
0.950
0.975
1.000
1.025
1.050
SUS*
REF
REF
REF
REF
REF
REF
REF
REF
REF
REF
REF
REF
REF
REF
REF
REF
UPPER SUSPEND CODES
S1
GND
GND
GND
GND
REF
REF
REF
REF
OPEN
OPEN
OPEN
OPEN
VCC
VCC
VCC
VCC
S0
GND
REF
OPEN
VCC
GND
REF
OPEN
VCC
GND
REF
OPEN
VCC
GND
REF
OPEN
VCC
VOUT (V)
1.075
1.100
1.125
1.150
1.175
1.200
1.225
1.250
1.275
1.300
1.325
1.350
1.375
1.400
1.425
1.450
Evaluates: MAX1544/MAX1545
Evaluates: MAX1544/MAX1545
*Note: Connect the 3-level SUS input to a 2.7V or greater supply (3.3V or V
CC
) for an input logic level high.
Table 3. MAX1544/MAX1545 Operating Mode Truth Table
SHDN
GND
V
CC
SUS
x
GND
SKIP
x
V
CC
OFS
x
GND or REF
OUTPUT
VOLTAGE
GND
D0-D4
(No offset)
D0-D4
(No offset)
OPERATING MODE
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).
Normal Operation. The no load output voltage is determined by the
selected VID DAC code (D0-D4, Table 1).
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.
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.
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.
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.
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 V
CC
power is cycled or
SHDN
toggled.
V
CC
x
REF
GND or REF
V
CC
x
GND
GND or REF
D0-D4
(No offset)
V
CC
GND
REF
or
High
x
x
0 to 0.8V
or
1.2V to 2.0V
x
D0-D4
(Plus offset)
SUS, S0-S1
(Offset
disabled)
GND
V
CC
x
V
CC
x
x
MAXIM
5
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