MAX17021EVKIT [MAXIM]
High Speed, Accuracy, and Efficiency;
| 型号： | MAX17021EVKIT |
| 厂家： | 
MAXIM INTEGRATED PRODUCTS |
| 描述： | High Speed, Accuracy, and Efficiency |
| 文件： | 总15页 (文件大小：1142K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
19-4511; Rev 0; 3/09
MAX17021 Evaluation Kit
Evluates:
General Description
Features
o Dual-Phase, Fast-Response Interleaved,
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-
Quick-PWM
o Intel IMVP-6+ Code-Set Compliant
(Montevina Socket Configuration)
o Dynamic Phase Selection Optimizes
age CPU core V
rail. The MAX17021 EV kit meets the
CC
Active/Sleep Efficiency
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.
o Transient Phase Overlap Reduces Output
Capacitance
o Active Voltage Positioning with Adjustable Gain
o High Speed, Accuracy, and Efficiency
MAX7021
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)
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.
o Power-Good (PWRGD) and Phase-Good
(PHASEGD) Outputs and Indicators
o Clock Enable (CLKEN) and Thermal Fault (VRHOT)
Outputs and Indicators
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.
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
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.
Ordering Information
PART
TYPE
MAX17021EVKIT+
EV Kit
+Denotes lead(Pb)-free and RoHS compliant.
Component List
DESIGNATION QTY
DESCRIPTION
DESIGNATION QTY
DESCRIPTION
10µF ±±0%, ±5V X5R ceramic
capacitors (1±10)
Murata GRM3±DR61E106KA1±L
TDK C3±±5X7R1E106M
AVX 1±103D106M
CLKEN,
DPRSLPVR,
GND_SENSE,
PGDIN,
PHASEGD, PSI,
PWRGD, V3P3,
VOUT_SENSE,
VRHOT, VR_ON
C1–C4
4
11 Test points
Taiyo Yuden TMK3±5BJ106MM
KEMET C1±10C106M3RAC
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
Component List (continued)
DESIGNATION QTY
DESCRIPTION
DESIGNATION QTY
DESCRIPTION
0.36µH, 36A, 0.8±mꢀ power
inductors
330µF, ±V, 4.5mꢀ low-ESR polymer
capacitors (D case)
L1, L±
±
Panasonic ETQP4LR36ZFJ
NEC TOKIN MPC1055LR36
TOKO FDUE1040D-R36M
C5–C8
C9
4
0
±
Panasonic EEFSX0D331E4 or
NEC TOKIN PSGV0E337M4.5
KEMET T5±0V337M±R5ATE4R5
n-channel MOSFETs (PowerPAK 8 SO)
Fairchild FDS6±98 (8 SO)
Vishay (Siliconix) SI4386DY
Not installed, ceramic capacitor
(0805)
N1, N±
N3–N6
±
4
MAX7021
1µF ±10%, 16V X5R ceramic
capacitors (0603)
TDK C1608X5R1C105K
Taiyo Yuden EMK107BJ683MA
Murata GRM188R61C105K
n-channel MOSFETs (PowerPAK 8 SO)
Fairchild FDS8670 (8 SO)
Vishay (Siliconix) SI46±6ADY
C10, C11
Not installed, n-channel MOSFET
(D-PAK)
N7
0
0
5
Not installed, ceramic capacitors
(0603)
C1±, C±0–C±6 are open; C±7 is
short (PC trace)
Not installed, n-channel MOSFETs
(PowerPAK 8 SO)
N8, N9
C1±, C±0–C±7
0
6
R1, R15, R16,
R43, R44
10ꢀ ±5% resistors (0603)
Evluates:
0.±±µF ±±0%, 10V X7R ceramic
capacitors (0603)
Murata GRM188R71A±±4K
Taiyo Yuden LMK107BJ±±4MA
TDK C1608X7R1C±±4M
AVX 06033D±±4KAT
R±
1
1
1
±
±
±
±
59kꢀ ±1% resistor (0603)
1±.1kꢀ ±1% resistor (0603)
±00kꢀ ±1% resistor (0603)
0ꢀ resistors (0603)
C13–C16, C±8,
C±9
R3
R4
R5, R6
R7, R11
R8, R1±
R9, R13
1.±1kꢀ ±1% resistors (0603)
1.50kꢀ ±1% resistors (0603)
±0kꢀ ±1% resistors (0603)
1000pF ±10%, 50V X7R ceramic
capacitors (0603)
TDK C1608X7R1H10±K or
Murata GRM188R71H10±K or
equivalent
C17, C18, C19
3
10kꢀ ±1% NTC thermistors,
ß = 3380 (0603)
Murata NCP18XH103F03RB
TDK NTCG163JH103F
R10, R14
±
10µF ±±0%, 6.3V X5R ceramic
capacitors (0805)
C30–C39,
C6±–C65
14 TDK C±01±X5R0J106M or
Taiyo Yuden AMK±1±BJ106MG
AVX 08056D106MAT
R17
1
0
4.3±kꢀ ±1% resistor (0603)
Not installed, resistors (0603)
R18, R±4, and R33 are open; R34
and R35 are short (PC trace)
R18, R±4, R33,
R34, R35,
±±µF, 6.3V X5R ceramic capacitors
R19
R±0
1
0
51ꢀ ±5% resistor (0603)
(0805)
TDK C±01±X5R0J±±6MT
Taiyo Yuden JMK±1±BJ±±6MG
C40–C49
D1, D±
10
Not installed, 1W resistor (±51±)
R±1, R±±, R±3,
R30
4
1
1kꢀ ±5% resistors (0603)
13kꢀ ±1% resistor (0603)
3A, 30V Schottky diodes
Nihon EC31QS03L
Central Semi CMSH3-40M
±
R±5
100kꢀ ±5% NTC thermistor,
ß = 4±50 (0603)
Murata NCP18WF104J03RB
TDK NTCG163JF104J (040±) or
Panasonic ERT-J1VR104J
LEDs, green clear SMD (0805)
LITE-ON Electronics LTST-C170GKT
Digi-Key 160-1179-1-ND
D3–D6
JU1
4
0
R±6
1
Not installed, 3-pin header
2
_______________________________________________________________________________________
MAX17021 Evaluation Kit
Evluates:
Component List (continued)
DESIGNATION QTY
DESCRIPTION
DESIGNATION QTY
DESCRIPTION
R±7, R±8, R±9,
Dual-phase, Quick-PWM VID
controller (40 TQFN-EP*)
Maxim MAX170±1GTL+
R31, R3±,
R36–R4±
1± 100kꢀ ±5% resistors (0603)
U1
1
R45, R46
SW1
±
1
1
±ꢀ ±5% resistors (0603)
U±
1
1
CPU socket MPGA479
7-position low-profile DIP switch
5-position low-profile DIP switch
—
PCB: MAX170±1 Evaluation Kit+
SW±
*EP = Exposed pad.
MAX7021
Component Suppliers
SUPPLIER
PHONE
WEBSITE
AVX Corporation
843-946-0238
631-435-1110
800-344-4539
www.avxcorp.com
www.centralsemi.com
www.digikey.com
Central Semiconductor Corp.
Digi-Key Corp.
Fairchild Semiconductor
KEMET Corp.
888-522-5372
864-963-6300
www.fairchildsemi.com
www.kemet.com
Murata Electronics North America, Inc.
NEC TOKIN America, Inc.
Nihon Inter Electronics Corp.
Panasonic Corp.
770-436-1300
408-324-1790
847-843-7500
800-344-2112
800-348-2496
847-803-6100
847-297-0070
402-563-6866
www.murata-northamerica.com
www.nec-tokinamerica.com
www.niec.co.jp
www.panasonic.com
www.t-yuden.com
Taiyo Yuden
TDK Corp.
www.component.tdk.com
www.tokoam.com
TOKO America, Inc.
Vishay
www.vishay.com
Note: Indicate that you are using the MAX17021 when contacting these component suppliers.
and SW1 (7, 8) to the on positions. The output voltage
Quick Start
Recommended Equipment
is set for 1.050V.
3) Turn on the battery power before turning on the 5V
bias power.
•
•
MAX17021 EV kit
7V to 24V, > 100W power supply, battery, or note-
book AC adapter
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.
•
•
•
•
DC bias power supply, 5V at 1A
Dummy load capable of sinking 60A
Digital multimeters (DMMs)
Detailed Description of Hardware
This 60A peak multiphase buck-regulator design is
optimized for a 300kHz switching frequency (per
100MHz dual-trace oscilloscope
Procedure
phase) and output-voltage settings around 1V. At V
OUT
The MAX17021 EV kit is fully assembled and tested.
Follow the steps below to verify board operation:
= 1V and V = 12V, the inductor ripple is approximate-
IN
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.
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),
_______________________________________________________________________________________
3
MAX17021 Evaluation Kit
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.
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:
Table 1. MAX17021 Operating Mode Truth Table
INPUTS
MAX7021
PHASE
OPERATION*
SHDN DPRSTP DPRSLPVR
PSI
SW2
(3, 8)
OPERATING MODE
SW2
SW2
(5, 6)
SW2
(2, 9)
(1, 10)
Low-Power Shutdown Mode. DL1 and DL± are forced low and the
controller is disabled. The supply current drops to 1µA (max).
GND
X
X
X
Disabled
Multiphase
Pulse Skipping
Startup/Boot. When SHDN is pulled high, the MAX170±1 begins the
startup sequence. The controller enables the PWM controller and
ramps the output voltage up to the boot voltage.
Rising
X
X
X
1/8 R
TIME
Slew Rate
Evluates:
Multiphase
Forced-PWM
Full Power. The no-load output voltage is determined by the selected
VID DAC code (D0–D6, Table ±).
High
High
High
High
Low
Low
High
Low
Normal R
TIME
Slew Rate
1-Phase
Forced-PWM
Intermediate Power. The no-load output voltage is determined by the
selected VID DAC code (D0–D6, Table ±). When PSI is pulled low, the
MAX170±1 immediately disables phase ±. DH± and DL± are pulled low.
Normal R
TIME
Slew Rate
Deeper Sleep Mode. The no-load output voltage is determined by the
selected VID DAC code (D0–D6, Table ±). When DPRSLPVR is pulled
high, the MAX170±1 immediately enters 1-phase pulse-skipping
operation allowing automatic PWM/PFM switchover under light loads.
The PWRGD and CLKEN upper thresholds are blanked during
downward transitions. DH± and DL± are pulled low.
1-Phase Pulse
Skipping
High
High
Low
High
High
X
X
Normal R
TIME
Slew Rate
Deeper Sleep Slow Exit Mode. The no-load output voltage is
determined by the selected VID DAC code (D0–D6, Table ±).
When DPRSTP is pulled high while DPRSLPVR is already high, the
MAX170±1 remains in one-phase pulse-skipping operation, allowing
automatic PWM/PFM switchover under light loads, but reduces its
slew rate to 1/4 of normal.
1-Phase Pulse
Skipping
High
1/4 R
Slew
TIME
Rate
Shutdown. When SHDN is pulled low, the MAX170±1 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.
Multiphase
Forced-PWM
Falling
High
X
X
X
X
X
X
1/8 R
TIME
Slew Rate
Fault Mode. The fault latch has been set by the MAX170±1 UVP or
thermal-shutdown protection, or by the OVP protection. The controller
Disabled
remains in fault mode until V power is cycled or SHDN toggled.
CC
*Multiphase operation = All enabled phases active.
X = Don’t care.
4
_______________________________________________________________________________________
MAX17021 Evaluation Kit
Evluates:
Table 2. MAX17021 IMVP-6.5+ Output-Voltage VID DAC Codes
OUTPUT
VOLTAGE (V)
OUTPUT
VOLTAGE (V)
D6
D5
D4
D3
D2
D1
D0
D6 D5 D4 D3 D2 D1 D0
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
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
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
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
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
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
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
1.5000
1.4875
1.4750
1.46±5
1.4500
1.4375
1.4±50
1.41±5
1.4000
1.3875
1.3750
1.36±5
1.3500
1.3375
1.3±50
1.31±5
1.3000
1.±875
1.±750
1.±6±5
1.±500
1.±375
1.±±50
1.±1±5
1.±000
1.1875
1.1750
1.16±5
1.1500
1.1375
1.1±50
1.11±5
1.1000
1.0875
1.0750
1.06±5
1.0500
1.0375
1.0±50
1.01±5
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
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
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
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
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
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
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
0.7000
0.6875
0.6750
0.66±5
0.6500
0.6375
0.6±50
0.61±5
0.6000
0.5875
0.5750
0.56±5
0.5500
0.5375
0.5±50
0.51±5
0.5000
0.4875
0.4750
0.46±5
0.4500
0.4375
0.4±50
0.41±5
0.4000
0.3875
0.3750
0.36±5
0.3500
0.3375
0.3±50
0.31±5
0.3000
0.±875
0.±750
0.±6±5
0.±500
0.±375
0.±±50
0.±1±5
MAX7021
_______________________________________________________________________________________
5
MAX17021 Evaluation Kit
Table 2. MAX17021 IMVP-6.5+ Output-Voltage VID DAC Codes (continued)
OUTPUT
VOLTAGE (V)
OUTPUT
VOLTAGE (V)
D6
D5
D4
D3
D2
D1
D0
D6 D5 D4 D3 D2 D1 D0
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
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
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
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
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
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
1.0000
0.9875
0.9750
0.96±5
0.9500
0.9375
0.9±50
0.91±5
0.9000
0.8875
0.8750
0.86±5
0.8500
0.8375
0.8±50
0.81±5
0.8000
0.7875
0.7750
0.76±5
0.7500
0.7375
0.7±50
0.71±5
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
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
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
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
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
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0.±000
0.1875
0.1750
0.16±5
0.1500
0.1375
0.1±50
0.11±5
0.1000
0.0875
0.0750
0.06±5
0.0500
0.0375
0.0±50
0.01±5
0
MAX7021
Evluates:
0
0
0
0
0
0
0
2) Switch SW1. When SW1 positions are off, the
MAX17021’s D0–D6 inputs are at logic 1 (connect-
ed to VDD). When SW1 positions are on, D0–D6
inputs are at logic 0 (connected to GND). The out-
put voltage can be changed during operation by
activating SW1 on and off. As shipped, the EV kit is
configured with SW1 positions set for 1.050V output
(Table 2). Refer to the MAX17021 IC data sheet for
more information.
input (FBAC), so the resistance between FBAC and V
OUT
(R17) determines the voltage-positioning gain. Resistor
R17 (4.32kΩ) provides a -2.1mV/A voltage-positioning
slope at the output when all phases are active. Remote
output and ground sensing eliminate any additional
PCB voltage drops.
Dynamic Output-Voltage
Transition Experiment
This MAX17021 EV kit is set to transition the output volt-
age at 12.6mV/µs. The speed of the transition is altered
by scaling resistors R2 and R3.
Reduced Power-Dissipation
Voltage Positioning
The MAX17021 includes a transconductance amplifier for
adding gain to the voltage-positioning sense path. The
amplifier’s input is generated by summing the current-
sense inputs, which differentially sense the voltage
across the inductor’s DCR. The transconductance ampli-
fier’s output connects to the voltage-positioned feedback
During the voltage transition, watch the inductor current by
looking at the current-sense inputs with a differential scope
probe. Observe the low, well-controlled inductor current
that accompanies the voltage transition. Slew-rate control
during shutdown and startup results in well-controlled
currents in to and out of the battery (input source).
6
_______________________________________________________________________________________
MAX17021 Evaluation Kit
Evluates:
There are two methods to create an output-voltage
transition. Select D0–D6 (SW1). Then either manually
change the SW1 settings to a new VID code setting
(Table 2), or disable all SW1 settings and drive the
VID0–VID6 PCB test points externally to the desired
code settings.
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 pro-
hibited here by the need for low resistance and induc-
tance in the path of the dummy-load MOSFET. To
determine how much load current a particular pulse-
generator amplitude is causing, observe the current
through inductor L1. In the buck topology, the load cur-
rent is approximately equal to the average value of the
inductor current.
Load-Transient Experiment
One interesting experiment is to subject the output to
large, fast load transients and observe the output with
an oscilloscope. Accurate measurement of output rip-
ple and load-transient response invariably requires that
ground clip leads be completely avoided and the
probe removed to expose the GND shield, so the probe
can be directly grounded with as short a wire as possi-
ble to the board. Otherwise, EMI and noise pickup cor-
rupt the waveforms.
MAX7021
Note: The CPU socket is based on the Montevina plat-
form pin configuration.
Switch SW2 Settings
Shutdown SW2 (1, 10)
When SHDN goes low (SW2 (1, 10) = on), the
MAX17021 enters low-power shutdown mode. PWRGD
is pulled low immediately and the output voltage ramps
down at 1/8 the slew rate set by R2 and R3 (71.1kΩ).
When the controller reaches the 0V target, the drivers are
disabled (DL1 and DL2 driven low), the reference is
turned off, and the IC supply currents drop to 1µA (max).
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 IMVP-6.5+ VCORE pins
requires at least 500A/µs load transients. An easy
method for generating such an abusive load transient is
to install a power MOSFET at the N7 location and install
resistor R20 between 5mΩ and 10mΩ to monitor the
transient current. Then drive its gate (TP1) with a strong
pulse generator at a low-duty cycle (< 5%) to minimize
When a fault condition activates the shutdown
sequence (output undervoltage lockout or thermal shut-
Table 3. Shutdown Mode (SHDN)
SW2 (1, 10)
SHDN PIN
MAX17021 OUTPUT
Off*
On
Connected to VDD
Connected to GND
Output enabled—V
is selected by VID DAC code (D0–D6) settings
= 0V
OUT
Shutdown mode, V
OUT
*Default position.
Table 4. DPRSLPVR, PSI
DPRSLPVR
SW2 (2, 9)
PSI
SW2 (3, 8)
POWER LEVEL
OPERATING MODE
On (VDD)
Off (GND)
Off (GND)*
X
Low current
Intermediate
Full
1-phase pulse-skipping mode
On (GND)
Off (VDD)*
1-phase forced-PWM mode
Normal operation—all phases are active, forced-PWM mode
*Default position.
X = Don’t care.
Table 5. DPRSTP
SW2 (5, 6)
DPRSTP PIN
MAX17021
Off
On*
Connected to VDD
Connected to GND
1/4 of nominal slew rate is set by R2 and R3 if DPRSLPVR is also high
Nominal slew rate
*Default position.
_______________________________________________________________________________________
7
MAX17021 Evaluation Kit
down), the protection circuitry sets the fault latch to
prevent the controller from restarting. To clear the fault
latch and reactivate the MAX17021, toggle SHDN or
DPRSLPVR are forced high, the slew rate is reduced to
a quarter of the nominal slew rate.
PGDIN, SW2 (4, 7)
PGDIN indicates the power status of other system rails
and is used for power-supply sequencing. After power-
up to the boot voltage, the output voltage remains at
cycle V
power.
DD
DPRSLPVR SW2 (2, 9), PSI SW2 (3, 8)
DPRSLPVR and PSI together determine the operating
mode, as shown in Table 4. The MAX17021 will be
forced into full-phase pulse-skipping mode during start-
up and while in boot mode, and forced into full-phase
PWM mode during the transition from boot mode to VID
mode and during soft-shutdown.
V , CLKEN remains high, and PWRGD remains low
BOOT
as long as the PGDIN stays low. When PGDIN is pulled
high, the output transitions to selected VID voltage, and
CLKEN is pulled low. If the system pulls PGDIN low
during normal operation, the MAX17021 immediately
drives CLKEN high, pulls PWRGD low, and slews the
output to the boot voltage (using 2-phase pulse-skip-
ping mode). The controller remains at the boot voltage
until PGDIN goes high again, SHDN is toggled, or the
MAX7021
DPRSTP, SW2 (5, 6)
This 1V logic input signal together with the DPRSLPVR
signal selects between the nominal and “slow” (quarter
of nominal rate) slew rates. When DPRSTP and
V
DD
is cycled.
Table 6. PGDIN
SW2 (4, 7)
PGDIN PIN
MAX17021 OUTPUT
Evluates:
VOUT remains at the boot voltage. CLKEN remains high, and PWRGD
remains low.
Off
Connected to GND
Connected to VDD
On*
VOUT transitions to selected VID voltage, and CLKEN is pulled low.
*Default position.
8
_______________________________________________________________________________________
MAX17021 Evaluation Kit
Evluates:
MAX7021
Figure 1a. MAX17021 EV Kit Schematic (Sheet 1 of 2)
_______________________________________________________________________________________
9
MAX17021 Evaluation Kit
MAX7021
Evluates:
Figure 1b. MAX17021 EV Kit Schematic (Sheet 2 of 2)
10 ______________________________________________________________________________________
MAX17021 Evaluation Kit
Evluates:
MAX7021
Figure 2. MAX17021 EV Kit Component Placement Guide—
Component Side
Figure 3. MAX17021 EV Kit PCB Layout—Component Side
______________________________________________________________________________________ 11
MAX17021 Evaluation Kit
MAX7021
Evluates:
Figure 4. MAX17021 EV Kit PCB Layout—Internal Layer 2
(VBATT/PGND Plane)
Figure 5. MAX17021 EV Kit PCB Layout—Internal Layer 3
(Signal Layer)
12 ______________________________________________________________________________________
MAX17021 Evaluation Kit
Evluates:
MAX7021
Figure 6. MAX17021 EV Kit PCB Layout—Internal Layer 4
(PGND Layer)
Figure 7. MAX17021 EV Kit PCB Layout —Internal Layer 5
(AGND/PGND Layer)
______________________________________________________________________________________ 13
MAX17021 Evaluation Kit
MAX7021
Evluates:
Figure 8. MAX17021 EV Kit PCB Layout—Internal Layer 6
(Signal Layer)
Figure 9. MAX17021 EV Kit PCB Layout—Internal Layer 7
(PGND Layer)
14 ______________________________________________________________________________________
MAX17021 Evaluation Kit
Evluates:
MAX7021
Figure 10. MAX17021 EV Kit PCB Layout—Solder Side
Figure 11. MAX17021 EV Kit Component Placement Guide—
Solder Side
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are
implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.
Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 ____________________ 15
© 2009 Maxim Integrated Products
Maxim is a registered trademark of Maxim Integrated Products, Inc.
SPRINGER
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