19-4511; Rev 0; 3/09
MAX17021 Evaluation Kit
General Description
The MAX17021 evaluation kit (EV kit) demonstrates the
high-power, dynamically adjustable, multiphase
IMVP-6.5+ notebook CPU application circuit. This
DC-DC converter steps down high-voltage batteries
and/or AC adapters, generating a precision, low-volt-
age CPU core V
CC
rail. The MAX17021 EV kit meets the
Intel mobile IMVP-6+ CPU’s transient voltage specifica-
tion, power-good signaling, voltage regulator thermal
monitoring (VRHOT), and power-good output
(PWRGD). The MAX17021 kit consists of the MAX17021
2-phase interleaved Quick-PWM™ step-down con-
troller. The MAX17021 kit includes active voltage posi-
tioning with adjustable gain, reducing power dissipation
and bulk output capacitance requirements. A slew-rate
controller allows controlled transitions between VID
codes, controlled soft-start and shutdown, and con-
trolled exit suspend voltage. Precision slew-rate control
provides “just-in-time” arrival at the new DAC setting,
minimizing surge currents to and from the battery.
Two dedicated system inputs (PSI and DPRSLPVR)
dynamically select the operating mode and number of
active phases, optimizing the overall efficiency during
the CPU’s active and sleep states.
The MAX17021 includes latched output undervoltage-
fault protection, overvoltage-fault protection, and ther-
mal-overload protection. It also includes a voltage regu-
lator power-good (PWRGD) output, a clock enable
(CLKEN) output, and a phase-good (PHASEGD) output.
This fully assembled and tested circuit board provides
a digitally adjustable 0 to 1.5000V output voltage (7-bit
on-board DAC) from a 7V to 24V battery input range.
Each phase is designed for a 20A thermal design cur-
rent, and delivers up to 30A peak output current for a
total of 60A. The EV kit operates at 300kHz switching
frequency (per phase) and has superior line- and load-
transient response.
Features
o
Dual-Phase, Fast-Response Interleaved,
Quick-PWM
o
Intel IMVP-6+ Code-Set Compliant
(Montevina Socket Configuration)
o
Dynamic Phase Selection Optimizes
Active/Sleep Efficiency
o
Transient Phase Overlap Reduces Output
Capacitance
o
Active Voltage Positioning with Adjustable Gain
o
High Speed, Accuracy, and Efficiency
o
Low-Bulk Output Capacitor Count
o
7V to 24V Input-Voltage Range
o
0 to 1.5000V Output-Voltage Range (7-Bit DAC)
o
60A Peak Load-Current Capability (30A Each Phase)
o
Accurate Current Balance and Current Limit
o
300kHz Switching Frequency (per Phase)
o
Power-Good (PWRGD) and Phase-Good
(PHASEGD) Outputs and Indicators
o
Clock Enable (CLKEN) and Thermal Fault (VRHOT)
Outputs and Indicators
o
Output Overvoltage and Undervoltage Fault
Protections
o
40-Pin Thin QFN Package with Exposed Pad
o
Lead(Pb)-Free and RoHS Compliant
o
Fully Assembled and Tested
Evaluates: MAX17021
Ordering Information
PART
MAX17021EVKIT+
TYPE
EV Kit
+Denotes
lead(Pb)-free and RoHS compliant.
Component List
DESIGNATION
CLKEN,
DPRSLPVR,
GND_SENSE,
PGDIN,
PHASEGD,
PSI,
PWRGD, V3P3,
VOUT_SENSE,
VRHOT,
VR_ON
QTY
DESCRIPTION
DESIGNATION
QTY
DESCRIPTION
10µF ±20%, 25V X5R ceramic
capacitors (1210)
Murata GRM32DR61E106KA12L
TDK C3225X7R1E106M
AVX 12103D106M
Taiyo Yuden TMK325BJ106MM
KEMET C1210C106M3RAC
11
Test points
C1–C4
4
Quick-PWM is a trademark of Maxim Integrated Products, Inc.
________________________________________________________________
Maxim Integrated Products
1
For information on other Maxim products, visit Maxim’s website at www.maxim-ic.com.
MAX17021 Evaluation Kit
Evaluates: MAX17021
Component List (continued)
DESIGNATION
QTY
DESCRIPTION
330µF, 2V, 4.5m low-ESR polymer
capacitors (D case)
Panasonic EEFSX0D331E4 or
NEC TOKIN PSGV0E337M4.5
KEMET T520V337M2R5ATE4R5
Not installed, ceramic capacitor
(0805)
1µF ±10%, 16V X5R ceramic
capacitors (0603)
TDK C1608X5R1C105K
Taiyo Yuden EMK107BJ683MA
Murata GRM188R61C105K
Not installed, ceramic capacitors
(0603)
C12, C20–C26 are open; C27 is
short (PC trace)
0.22µF ±20%, 10V X7R ceramic
capacitors (0603)
Murata GRM188R71A224K
Taiyo Yuden LMK107BJ224MA
TDK C1608X7R1C224M
AVX 06033D224KAT
1000pF ±10%, 50V X7R ceramic
capacitors (0603)
TDK C1608X7R1H102K or
Murata GRM188R71H102K or
equivalent
10µF ±20%, 6.3V X5R ceramic
capacitors (0805)
TDK C2012X5R0J106M or
Taiyo Yuden AMK212BJ106MG
AVX 08056D106MAT
22µF, 6.3V X5R ceramic capacitors
(0805)
TDK C2012X5R0J226MT
Taiyo Yuden JMK212BJ226MG
3A, 30V Schottky diodes
Nihon EC31QS03L
Central Semi CMSH3-40M
LEDs, green clear SMD (0805)
LITE-ON Electronics LTST-C170GKT
Digi-Key 160-1179-1-ND
Not installed, 3-pin header
DESIGNATION
QTY
DESCRIPTION
0.36µH, 36A, 0.82m power
inductors
Panasonic ETQP4LR36ZFJ
NEC TOKIN MPC1055LR36
TOKO FDUE1040D-R36M
n-channel MOSFETs (PowerPAK 8 SO)
Fairchild FDS6298 (8 SO)
Vishay (Siliconix) SI4386DY
n-channel MOSFETs (PowerPAK 8 SO)
Fairchild FDS8670 (8 SO)
Vishay (Siliconix) SI4626ADY
Not installed, n-channel MOSFET
(D-PAK)
Not installed, n-channel MOSFETs
(PowerPAK 8 SO)
10
59k
12.1k
200k
0
1.21k
1.50k
20k
±5% resistors (0603)
±1% resistor (0603)
±1% resistor (0603)
±1% resistor (0603)
±1% resistors (0603)
±1% resistors (0603)
±1% resistors (0603)
C5–C8
4
L1, L2
2
C9
0
N1, N2
2
C10, C11
2
N3–N6
4
N7
N8, N9
R1, R15, R16,
R43, R44
R2
R3
R4
R5, R6
R7, R11
R8, R12
R9, R13
0
0
5
1
1
1
2
2
2
2
C12, C20–C27
0
C13–C16, C28,
C29
6
resistors (0603)
C17, C18, C19
3
R10, R14
2
10k ±1% NTC thermistors,
ß = 3380 (0603)
Murata NCP18XH103F03RB
TDK NTCG163JH103F
4.32k
±1% resistor (0603)
Not installed, resistors (0603)
R18, R24, and R33 are open; R34
and R35 are short (PC trace)
51
±5% resistor (0603)
Not installed, 1W resistor (2512)
1k
13k
±5% resistors (0603)
±1% resistor (0603)
C30–C39,
C62–C65
14
R17
R18, R24, R33,
R34, R35,
R19
R20
R21, R22, R23,
R30
R25
1
0
1
0
4
1
C40–C49
10
D1, D2
2
D3–D6
JU1
4
0
R26
1
100k ±5% NTC thermistor,
ß = 4250 (0603)
Murata NCP18WF104J03RB
TDK NTCG163JF104J (0402) or
Panasonic ERT-J1VR104J
2
_______________________________________________________________________________________
MAX17021 Evaluation Kit
Component List (continued)
DESIGNATION
R27, R28, R29,
R31, R32,
R36–R42
R45, R46
SW1
SW2
QTY
12
2
1
1
100k
2
DESCRIPTION
±5% resistors (0603)
DESIGNATION
U1
U2
—
QTY
1
1
1
DESCRIPTION
Dual-phase, Quick-PWM VID
controller (40 TQFN-EP*)
Maxim MAX17021GTL+
CPU socket MPGA479
PCB: MAX17021 Evaluation Kit+
Evaluates: MAX17021
±5% resistors (0603)
7-position low-profile DIP switch
5-position low-profile DIP switch
*EP
= Exposed pad.
Component Suppliers
SUPPLIER
AVX Corporation
Central Semiconductor Corp.
Digi-Key Corp.
Fairchild Semiconductor
KEMET Corp.
Murata Electronics North America, Inc.
NEC TOKIN America, Inc.
Nihon Inter Electronics Corp.
Panasonic Corp.
Taiyo Yuden
TDK Corp.
TOKO America, Inc.
Vishay
PHONE
843-946-0238
631-435-1110
800-344-4539
888-522-5372
864-963-6300
770-436-1300
408-324-1790
847-843-7500
800-344-2112
800-348-2496
847-803-6100
847-297-0070
402-563-6866
WEBSITE
www.avxcorp.com
www.centralsemi.com
www.digikey.com
www.fairchildsemi.com
www.kemet.com
www.murata-northamerica.com
www.nec-tokinamerica.com
www.niec.co.jp
www.panasonic.com
www.t-yuden.com
www.component.tdk.com
www.tokoam.com
www.vishay.com
Note:
Indicate that you are using the MAX17021 when contacting these component suppliers.
Quick Start
Recommended Equipment
•
•
•
•
•
•
MAX17021 EV kit
7V to 24V, > 100W power supply, battery, or note-
book AC adapter
DC bias power supply, 5V at 1A
Dummy load capable of sinking 60A
Digital multimeters (DMMs)
100MHz dual-trace oscilloscope
and SW1 (7, 8) to the on positions. The output voltage
is set for 1.050V.
3) Turn on the battery power before turning on the 5V
bias power.
4) Observe the 1.050V 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 Description of Hardware
Procedure
This 60A peak multiphase buck-regulator design is
optimized for a 300kHz switching frequency (per
phase) and output-voltage settings around 1V. At V
OUT
= 1V and V
IN
= 12V, the inductor ripple is approximate-
ly 35% (LIR = 0.35). The MAX17021 controller inter-
leaves all the active phases, resulting in out-of-phase
operation that minimizes the input and output filtering
requirements. The multiphase controller shares the cur-
rent between two phases that operate 180° out-of-
phase, supplying up to 30A per phase.
3
The MAX17021 EV kit is fully assembled and tested.
Follow the steps below to verify board operation:
1) Ensure that the circuit is connected correctly to the
supplies and dummy load prior to applying any power.
2) Verify that all positions of switch SW2 are off. The DAC
code settings (D6–D0) are set by switch SW1. Set
SW1 (1, 14), SW1 (2, 13), SW1 (4, 11), SW1 (5, 10),
_______________________________________________________________________________________
MAX17021 Evaluation Kit
Evaluates: MAX17021
Setting the Output Voltage
The MAX17021 has an internal digital-to-analog con-
verter (DAC) that programs the output voltage. The out-
put voltage can be digitally set from 0 to 1.5000V
(Table 2) from the D0–D6 pins. There are two different
ways of setting the output voltage:
1)
Drive the external VID0–VID6 inputs (all SW1
positions are off).
The output voltage is set by dri-
ving VID0–VID6 with open-drain drivers (pullup
resistors are included on the board) or 3V/5V CMOS
output logic levels.
Table 1. MAX17021 Operating Mode Truth Table
INPUTS
SHDN DPRSTP
DPRSLPVR
SW2
SW2
SW2
(1, 10)
(5, 6)
(2, 9)
GND
X
X
PSI
SW2
(3, 8)
X
PHASE
OPERATION*
OPERATING MODE
Disabled
Low-Power Shutdown Mode. DL1 and DL2 are forced low and the
controller is disabled. The supply current drops to 1µA (max).
Rising
X
X
X
Multiphase
Startup/Boot. When
SHDN
is pulled high, the MAX17021 begins the
Pulse Skipping
startup sequence. The controller enables the PWM controller and
1/8 R
TIME
ramps the output voltage up to the boot voltage.
Slew Rate
Multiphase
Forced-PWM
Normal R
TIME
Slew Rate
1-Phase
Forced-PWM
Normal R
TIME
Slew Rate
Full Power. The no-load output voltage is determined by the selected
VID DAC code (D0–D6, Table 2).
High
High
Low
High
High
High
Low
Low
Intermediate Power. The no-load output voltage is determined by the
selected VID DAC code (D0–D6, Table 2). When
PSI
is pulled low, the
MAX17021 immediately disables phase 2. DH2 and DL2 are pulled low.
High
Low
High
X
Deeper Sleep Mode. The no-load output voltage is determined by the
1-Phase Pulse selected VID DAC code (D0–D6, Table 2). When DPRSLPVR is pulled
high, the MAX17021 immediately enters 1-phase pulse-skipping
Skipping
Normal R
TIME
operation allowing automatic PWM/PFM switchover under light loads.
Slew Rate
The PWRGD and
CLKEN
upper thresholds are blanked during
downward transitions. DH2 and DL2 are pulled low.
Deeper Sleep Slow Exit Mode. The no-load output voltage is
1-Phase Pulse determined by the selected VID DAC code (D0–D6, Table 2).
When DPRSTP is pulled high while DPRSLPVR is already high, the
Skipping
1/4 R
TIME
Slew MAX17021 remains in one-phase pulse-skipping operation, allowing
Rate
automatic PWM/PFM switchover under light loads, but reduces its
slew rate to 1/4 of normal.
Multiphase
Forced-PWM
1/8 R
TIME
Slew Rate
Shutdown. When
SHDN
is pulled low, the MAX17021 immediately
pulls PWRGD and PHASEGD low,
CLKEN
becomes high impedance,
all enabled phases are activated, and the output voltage is ramped
down to ground. Once the output reaches 0V, the controller enters the
low-power shutdown state.
Fault Mode. The fault latch has been set by the MAX17021 UVP or
thermal-shutdown protection, or by the OVP protection. The controller
remains in fault mode until V
CC
power is cycled or
SHDN
toggled.
High
High
High
X
Falling
X
X
X
High
X
X
X
Disabled
*Multiphase
operation = All enabled phases active.
X = Don’t care.
4
_______________________________________________________________________________________
MAX17021 Evaluation Kit
Evaluates: MAX17021
Table 2. MAX17021 IMVP-6.5+ Output-Voltage VID DAC Codes
D6
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
D5
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
D4
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
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
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
D2
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
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
0
0
1
1
0
0
1
1
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
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
OUTPUT
VOLTAGE (V)
1.5000
1.4875
1.4750
1.4625
1.4500
1.4375
1.4250
1.4125
1.4000
1.3875
1.3750
1.3625
1.3500
1.3375
1.3250
1.3125
1.3000
1.2875
1.2750
1.2625
1.2500
1.2375
1.2250
1.2125
1.2000
1.1875
1.1750
1.1625
1.1500
1.1375
1.1250
1.1125
1.1000
1.0875
1.0750
1.0625
1.0500
1.0375
1.0250
1.0125
D6
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
D5
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
D4
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
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
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
D2
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
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
0
0
1
1
0
0
1
1
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
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
OUTPUT
VOLTAGE (V)
0.7000
0.6875
0.6750
0.6625
0.6500
0.6375
0.6250
0.6125
0.6000
0.5875
0.5750
0.5625
0.5500
0.5375
0.5250
0.5125
0.5000
0.4875
0.4750
0.4625
0.4500
0.4375
0.4250
0.4125
0.4000
0.3875
0.3750
0.3625
0.3500
0.3375
0.3250
0.3125
0.3000
0.2875
0.2750
0.2625
0.2500
0.2375
0.2250
0.2125
_______________________________________________________________________________________
5
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