MAXIM MAX5037EVKIT

19-2782; Rev 0; 2/03
MAX5037 Evaluation Kit
Warning
The MAX5037 EV kit is designed to operate at high currents, and some of the components operate at high
temperatures. Avoid touching the components. The
evaluation board is not provided with a fuse. Use a
controlled current source to power up the board.
Under severe fault conditions, this EV kit may dissipate
a large amount of power. To avoid possible personal
injury, operate this kit with care.
Pentium is a registered trademark of Intel Corp.
Component List
DESIGNATION QTY
DESCRIPTION
C1, C2
2
47µF ±20%, 16V X5R ceramic
capacitors (2220)
TDK C5750X5R1C476M
C3–C11
9
22µF ±20%, 16V X5R ceramic
capacitors (1812)
TDK C4532X5R1C226M
C12–C21
10
270µF, 2V, 15mΩ low-ESR specialty
capacitors
Panasonic EEFUE0D271R
C22, C23
2
100µF ±10%, 6.3V ceramic capacitors
(2220)
Murata GRM55FR60J107KA01L
C24–C29
6
10µF ±20%, 6.3V X5R ceramic
capacitors (0805)
TDK C2012X5R0J106M
C30, C42
2
0Ω resistors (0603)
C31, C35, C37
3
0.01µF ±5%, 50V X7R ceramic
capacitors (0603)
Murata GRM188R71H103KA01
Features
♦ Designed to Meet VRM 9.0 Mechanical and
Electrical Specifications
♦ Two-Phase Power Conversion
♦ 5V or 12V Input Operation (Design Optimized for
12V Input)
♦ Output Voltage Programmable from 1.1V to 1.85V
in 25mV Step-Through VID Input
♦ VRM 9.0-Compliant Integrated 5-Bit DAC
♦ 52A Output Current
♦ Adaptive Voltage Positioning for Optimized
Transient Response
♦ Average Current-Mode Control for Superior
Current Sharing
♦ Current-Sharing Accuracy Within 5% Between
Parallel Channels
♦ Up to 95% Efficiency
♦ 500kHz Effective Switching Frequency
(Two Phases)
♦ Output Overload Protection
♦ Output Overvoltage Crowbar Protection
♦ Internal Undervoltage Lockout and Startup Circuit
♦ Excellent Line-and-Load Transient Response
♦ Phase Failure Detector
♦ Multiple-Phase Synchronization Between Parallel
Modules
♦ VRM 9.0-Compliant EDGE Connector
Ordering Information
PART
MAX5037EVKIT
TEMP RANGE
0°C to +60°C
IC PACKAGE
44 QFN
________________________________________________________________ Maxim Integrated Products
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.
1
Evaluates MAX5037
General Description
The MAX5037 evaluation (EV) kit is a fully assembled
and tested VRM power-supply evaluation kit. The EV kit
module can be inserted directly into the VRM daughter
board AMP connector (1364125-1 or equivalent) on
Pentium® 4 processor motherboards. The input voltage
range is either 4.75V to 5.5V or 8V to 13.2V. The EV kit
design is optimized for the best performance at 12V
input and 1.75V output voltage settings. The output is
programmable from 1.1V to 1.85V through VID input in
compliance with Intel’s VRM 9.0 specification. Up to 52A
load current is possible from dual-phase conversion.
High-power density and simple assembly is achieved
due to a lower component count using the MAX5037.
Evaluates MAX5037
MAX5037 Evaluation Kit
Component List (continued)
DESIGNATION QTY
C32, C41
2
C33, C36, C38
3
470pF ±5%, 16V COG ceramic
capacitors (0603)
Murata GRM1885C1H471JAB01
C34
C39, C44, C45
C40
C43
1
4700pF ±5%, 16V X7R ceramic
capacitor (0603)
Vishay VJ0603Y471JXJ
3
0.1µF ±10%, 16V X7R ceramic
capacitors (0603)
Murata GRM188R71C104KA01
1
1
1µF, 10V Y5V ceramic capacitor
(0603)
Murata GRM188F51A105
4.7µF ±10%, 16V X7R ceramic
capacitor (0805)
Murata GRM40-034X5R475K6.3
CON1
0
Not installed
D1, D2
2
Schottky diodes
ON Semi MBRS340T3
D3, D4
2
DESCRIPTION
0.47µF ±10%, 16V capacitors (0805)
TDK C1608X5R1A474K
2
Schottky diodes
ON Semi MBR0520LT1
DESIGNATION QTY
DESCRIPTION
L1, L2
2
0.6µH ±10% power inductors,
13mm × 13mm
Panasonic ETQP1H0R6BFX
Q1, Q2, Q5, Q6
4
MOSFETs PowerPAK SO-8
Vishay-Siliconix Si7860DP
Q3, Q4, Q7, Q8
4
MOSFETs PowerPAK SO-8
Vishay-Siliconix Si7886DP
R1–R4
4
0.0027Ω resistors (2512)
Panasonic ERJM1WSF2M7U
R5
1
10Ω ±1% resistor (0603)
R6, R19, R21
3
Not installed
R7, R15
2
3.3Ω ±1% resistors (0805)
R8
1
2.2Ω ±1% resistor (0805)
R9
1
7.5kΩ ±1% resistor (0603)
R10, R18
2
1kΩ ±1% resistors (0603)
R11, R14
2
49.9Ω ±1% resistors (0603)
R12, R20
2
0Ω ±1% resistors (0805)
R13, R16
2
0Ω ±1% resistors (0603)
R17
1
1Ω ±1% resistor (0603)
R22, R23
2
37.4kΩ ±1% resistors (0603)
R24
1
4.99kΩ ±1% resistor (0603)
R25
1
10kΩ ±1% resistor (0603)
SCR1
1
SCR 200V, 12A D-Pack
Teccor S2012D
HS1, HS2
2
Surface-mount flatback heatsinks
AAVID NP973541
JP3, JP4
2
3-pin headers
Digi-Key S1012-03-ND
U1
1
MAX5037ETH, dual-phase controller
(44-pin QFN)
JP5
1
2-pin header
Digi-Key S1012-02-ND
None
2
Shunts, JP3-2/3, JP4-2/3
Digi-Key SD9000-ND
_______________________________________________________________________________________
MAX5037 Evaluation Kit
SUPPLIER
PHONE
FAX
WEBSITE
AAVID Thermalloy
603-224-9988
603-223-1790
Murata
770-436-1300
770-436-3030
www.murata.com
ON Semiconductor
602-244-6600
602-244-3345
www.on-semi.com
Panasonic
714-373-7939
714-373-7183
www.panasonic.com
TDK
847-803-6100
847-390-4405
www.tdk.com
Teccor
972-580-7777
972-550-1309
www.teccor.com
Vishay
402-563-6866
402-563-6296
www.vishay.com
www.aavidthermalloy.com
Note: When contacting these suppliers, please indicate you are using the MAX5037.
Quick Start
The MAX5037 EV kit is fully assembled and tested. The
termination for input, output, and control is provided at
the edge connector as per VRM 9.0 specification. The
MAX5037 EV kit module fits into AMP connector
1364125-1 or equivalent. Follow these steps to verify
board operation. In the quick-start operation, full load
performance cannot be verified.
12V Input Operation
1) Connect a wire from edge-connector pin 57 to
COM. This sets the VID code to 01111 and output
voltage of 1.475V.
2) Place a jumper between pins 2 and 3 of JP4 for
250kHz switching frequency operation.
3) Connect a voltage source (15V/20A, min) at the
input (across C1 or C2). Use heavy-gauge wire,
and keep the connecting wires between the EV kit
and voltage source short. Use 2200µF/16V at the
input if the wires running from the voltage source to
the EV kit are thin and long. Connect voltmeters
across +VIN to COM and +VOUT to COM.
4) Connect the load between +VOUT (edge-connector
pins 49, 50) to COM (edge-connector pins 40, 42),
with ammeter in series; set the load to 1Ω. Connect
the voltmeter between SENSE+ (edge-connector
pin 52) and SENSE- (edge-connector pin 11) to
monitor the output voltage.
5) Gradually increase the input voltage to 12V while
monitoring the output voltage and input current.
2) Connect a wire from edge-connector pin 57 to
COM. This sets the VID code to 01111 and output
voltage of 1.475V.
3) Place a shunt between pins 2 and 3 of jumper JP4
for 250kHz switching frequency operation. For
500kHz operation, move the shunt to pins 1 and 2
of jumper JP4.
4) Connect a voltage source (range up to 15V/20A) at
the input (across C1 or C2). Use heavy-gauge wire,
and keep the connecting wires between the EV kit
and voltage source short. Use 2200µF/16V at the
input if the wires running from the source to the EV
kit are thin and long. Connect voltmeters across
+VIN to COM and +VOUT to COM.
5) Connect the load between +VOUT (edge-connector
pins 49, 50) to COM (edge-connector pins 40, 42),
with ammeter in series; set the load to 1Ω.
6) Connect the voltmeter between SENSE+ (edgeconnector pin 52) and SENSE- (edge-connector pin
11) to monitor the output voltage.
7) Gradually increase the input voltage to 5V while
monitoring the output voltage and input current.
Caution
1) Do not cover the gold plating of the edge connector
with solder if you want to evaluate the full load operation using the AMP connector.
2) In case of 5VIN operation, keep the input voltage
below 6V (Refer to the Absolute Maximum Ratings
of the MAX5037 data sheet).
5V Input Operation
1) Short the JMPR-5VIN pins with wire on the bottom
layer of the EV kit PC board. This connects IN
(MAX5037 pin 28) and VCC (MAX5037 pin 27)
(Figure 18).
_______________________________________________________________________________________
3
Evaluates MAX5037
Component Suppliers
Evaluates MAX5037
MAX5037 Evaluation Kit
Specifications
VIN = 5V or 12V (±10%)
VOUT = 1.1V to 1.85V through VID inputs (see Table 1)
IOUT = 52A
Efficiency = 90%
Adaptive Voltage Positioning = 120mV at 52A
Step Load = 9A to 52A
Step Load Slew Rate = 50A/µs
Dynamic Load Regulation = -189mVMAX (for VID setting of 1.75VOUT)
Termination = 62-pin edge connector (AMP136125-1 or
equivalent)
Pin Details = As per VRM 9.0 specifications
Operating Temperature = 0°C to +60°C (with 400LFM
airflow)
Table 1. Output Voltage vs. DAC Codes
VID INPUTS (0 = Connected to SGND, 1 = Open Circuit)
4
OUTPUT VOLTAGE (V)
VID4
VID3
VID2
VID1
VID0
VOUT
1
1
1
1
1
Output off
1
1
1
1
0
1.100
1
1
1
0
1
1.125
1
1
1
0
0
1.150
1
1
0
1
1
1.175
1
1
0
1
0
1.200
1
1
0
0
1
1.225
1
1
0
0
0
1.250
1
0
1
1
1
1.275
1
0
1
1
0
1.300
1
0
1
0
1
1.325
1
0
1
0
0
1.350
1
0
0
1
1
1.375
1
0
0
1
0
1.400
1
0
0
0
1
1.425
1
0
0
0
0
1.450
0
1
1
1
1
1.475
0
1
1
1
0
1.500
0
1
1
0
1
1.525
0
1
1
0
0
1.550
0
1
0
1
1
1.575
0
1
0
1
0
1.600
0
1
0
0
1
1.625
0
1
0
0
0
1.650
0
0
1
1
1
1.675
0
0
1
1
0
1.700
0
0
1
0
1
1.725
0
0
1
0
0
1.750
0
0
0
1
1
1.775
0
0
0
1
0
1.800
0
0
0
0
1
1.825
0
0
0
0
0
1.850
_______________________________________________________________________________________
MAX5037 Evaluation Kit
Evaluates MAX5037
3.80
0.25
0.25
JP3
JP4
COMPONENT SIDE
MAX5037 EV KIT
2.30
JP5
PIN 1 ON SOLDER SIDE
1
62
31
32
CON1
0.30
0.35
0.07
Figure 1. Outline Drawing of MAX5037 EV Kit
Table 2. Edge-Connector Pin Configuration
PIN
FUNCTION
PIN
FUNCTION
PIN
FUNCTION
PIN
FUNCTION
1
VIN+
16
VO+
31
VO-
47
VO+
2
VIN+
17
VO-
32
VO-
48
VO-
3
VIN+
18
VO+
33
VO+
49
VO+
4
VIN+
19
VO-
34
VO-
50
VO+
5
Rsvd
20
VO+
35
VO+
51
Rsvd
SENSE+
6
Key
21
VO-
36
VO-
52
7
VID3
22
VO+
37
VO+
53
EN
8
VID1
23
VO-
38
VO-
54
NC
VID0
9
Rsvd
24
VO+
39
VO+
55
10
PGOOD
25
VO-
40
VO-
56
VID2
11
SENSE-
26
VO+
41
VO+
57
VID4
12
Rsvd
27
VO-
42
VO-
58
VRM-pres
13
VO-
28
VO+
43
VO+
59
VIN-
14
VO+
29
VO-
44
VO-
60
VIN-
15
VO-
30
VO+
45
VO+
61
VIN-
46
VO-
62
VIN-
_______________________________________________________________________________________
5
Detailed Description
The MAX5037 EV kit is a voltage-regulating module that
provides 1.1V to 1.85V at 52A current from either a 5V or
12V input. The input voltage range can be 4.75V to 5.5V
for 5V input and 8V to 13.2V for 12V input conditions.
Use 2200µF/16V across the input if the wires running
from the source to the EV kit are thin and long. The output voltage is set from 5-bit VID input according to the
Intel VRM 9.0 specification (see Table 1). The form factor
and input/output terminations are also as per the Intel
VRM 9.0 specification. See Table 2 for pinouts of edge
connectors compatible with AMP1364125-1. CLKIN is
accessible through a 3-pin header (JP3), and a shunt is
provided for setting the switching frequency to either
250kHz or 500kHz. The phase-shifted clock output
(CLKOUT) is available at the 2-pin header (JP5) and can
be used to synchronize other MAX5037 EV kits. Use JP3
to set the phase shift of 60°, 90°, or 120°.
The MAX5037 EV kit is designed to achieve optimum
electrical performance at a 12V input. High efficiency is
achieved with careful component selection (Figure 18).
The switching MOSFETs, inductors, and sense resistors
are the major power-dissipating components. Two
MOSFETs are used at the upper and lower sides of
each phase to distribute the dissipated power in two
different packages. The product of the gate charge and
on-resistance of the MOSFET is a figure of merit, with a
lower number signifying better performance. The
MOSFETs chosen are optimized for a high-frequency
switching application. The upper MOSFETs have a low
gate charge and moderate on-resistance, and the lower
MOSFETs have very low on-resistance and a moderate
gate charge. The inductor is a low-profile, high-current
type with low DC resistance. The sense resistors have
very low inductance. Plenty of copper is provided
around these power components to dissipate heat
effectively. The input capacitors are high-ripple-current
capacity, very low ESR, ceramic type. The output
capacitors have to support large output current during
the load transient. Both polymer and ceramic-type
capacitors are used to achieve high output capacitance
and low ESR at high frequency.
5V Input Operation
The EV kit is designed for the best efficiency, transient
load performance at 12V input. The 5V input operation
can also be verified without significant component
change. Short the JMPR-5VIN pins with wire on the bottom layer of the EV kit PC Board. This connects IN (pin
28) and VCC (pin 27) of the MAX5037. For 5V input
operation, the switching frequency can be increased to
500kHz without significantly increasing the power losses.
To change the switching frequency to 500kHz, move
6
VOLTAGE-POSITIONING WINDOW
Evaluates MAX5037
MAX5037 Evaluation Kit
VCNTR + ∆VOUT/2
VCNTR
VCNTR - ∆VOUT/2
NO LOAD
1/2 LOAD
FULL LOAD
LOAD (A)
Figure 2. VRM Loadline with VCNTR = VID at Half Load
the shunt to pins 1 and 2 of JP4. For optimum transient
load performance, replace the existing 0.6µH inductors
with 0.3µH inductors.
Output Voltage
The output voltage set through the VID code has ±0.8%
accuracy. The voltage positioning and the ability to
operate with multiple reference voltages might require
the output to regulate away from a center value. Define
the center value as the voltage when the output voltage
equals the VID reference at exactly one-half the maximum
output current.
Set the voltage-positioning window (∆VOUT) using the
resistive feedback of the voltage-error amplifier. Use
the following equation to determine the values of RF
(R23) and RIN (R24) required for setting the voltagepositioning window:
∆VOUT = (R24 ✕ IOUT ) / (2 ✕ R23 ✕ GC)
The voltage at CNTR (pin 18) regulates to 1.2V (Figure
18). The inverting input to the voltage-error amplifier
(VEA) mirrors the current set by the resistor at CNTR,
centering the output voltage-positioning window around
the VID programmed output voltage. Set the center of
the output voltage with a resistor from CNTR to SGND as:
R21 =
1.2 × R24


R24
IOUT 
 + ( VOUT − VID)
 2 × R23 × GC 
0.05
RS
R1 × R2 R 3 × R4
RS =
=
R1 + R2 R 3 + R4
GC =
_______________________________________________________________________________________
MAX5037 Evaluation Kit
Evaluates MAX5037
OUTPUT VOLTAGE
vs. ILOAD AND RCNTR
1.90
RCNTR = 50kΩ
1.85
1.80
VOUT (V)
where R24 and R23 are the input and feedback resistors
of the voltage-error amplifier, GC is current-loop gain,
and RS is the current-sense resistor. See Figure 4 and
Figure 5 for the output voltage vs. the RCNTR (R21).
Applying the voltage-positioning window at different
VRM voltage settings requires an additional element
proportional to the VID setting. The resistor from REG
(pin 15) to SGND provides a current proportional to the
VID setting (Figure 18). Calculate the resistor from REG
to SGND as:
RCNTR = 100kΩ
1.75
1.70
RCNTR = 200kΩ
RCNTR = ∞
1.65
R22 = R23
VIN = +12V
VID SETTING = +1.75V
1.60
0
5 10 15 20 25 30 35 40 45 50 55
ILOAD (A)
R22 =
Figure 4. Output Voltage vs. ILOAD and RCNTR
OUTPUT VOLTAGE
vs. ILOAD AND RCNTR
1.60
VIN = +12V
VID SETTING = +1.4V
1.55
RCNTR = 50kΩ
1.50
VOUT (V)
where R23 is the feedback resistor of the voltage-error
amplifier. The voltage on REG is internally regulated to
the programmed VID output voltage.
Note that in the case of VID voltage setting equal to
VCOREMAX at IOUT = 0 (no load), R21 is calculated
from the above equation as infinity. Because the VID
setting has an output voltage set-point accuracy specification of 0.8%, the output voltage may exceed the
V CCMAX limit. For systems requiring V CCMAX as an
absolute maximum voltage at IOUT = 0 (no load), RREG
can be recalculated using the following equation:
R24 × R23
V


R24 + R23 × 1 − COREMAX 


VID
1.45
1.40
RCNTR = 100kΩ
1.35
RCNTR = 200kΩ
1.30
RCNTR = ∞
1.25
1.20
The voltage positioning of 120mV at 52A load is set in
the MAX5037 EV kit. See Figure 6 for the VRM output
load line for voltage positioning at a different ratio of RF
(R23) and RIN (R24).
0
5 10 15 20 25 30 35 40 45 50 55
ILOAD (A)
Figure 5. Output Voltage vs. ILOAD and RCNTR
OUTPUT VOLTAGE vs. OUTPUT CURRENT
AND ERROR AMP GAIN (RF / RIN)
VCOREMAX - ∆VOUT/2
VCOREMAX - ∆VOUT
VIN = +12V
VOUT = +1.8V
Rf / RIN = 15
1.80
Rf / RIN = 12.5
VOUT (V)
VOLTAGE-POSITIONING WINDOW
VCOREMAX ≤ VID
1.85
1.75
1.70
Rf / RIN = 7.5
Rf / RIN = 10
1.65
NO LOAD
1/2 LOAD
FULL LOAD
LOAD (A)
1.60
0
5 10 15 20 25 30 35 40 45 50 55
ILOAD (A)
Figure 3. VRM Loadline with VCOREMAX = VID at No Load
Figure 6. Output Voltage vs. Output Current and Error AMP
GAIN (RF/RIN)
_______________________________________________________________________________________
7
Ripple and Noise
EFFICIENCY vs. OUTPUT CURRENT
AND INPUT VOLTAGE
100
90
80
VIN = +5V
60
50
40
30
20
10
VOUT = +1.8V
fSW = 250kHz
0
Transient Load Response
The EV kit is designed to handle high slew-rate-current
step without exceeding the dynamic load regulation limit
of the output voltage. Figure 8 depicts the dynamic load
performance with 50A/µs slew rate of the current step.
VIN = +12V
70
η (%)
The worst-case peak-to-peak output-ripple voltage
depends on the inductor ripple current, capacitance,
and ESR of the output capacitors. In multiphase converter design, the ripple currents from individual phases cancel each other, and the resultant ripple current is
lower. The degree of ripple cancellation depends on
the operating duty cycle and number of phases. Note
that ripple cancellation is maximum when the NPH =
K/D condition is met, where NPH is the number of phases, D is the operating duty cycle, and K = 1, 2, or 3.
See Figure 7 for the output ripple waveforms of the EV
kit at full load.
0 4 8 12 16 20 24 28 32 36 40 44 48 52
IOUT (A)
Figure 9. Efficiency vs. Output Current and Input Voltage
EFFICIENCY vs. OUTPUT CURRENT
AND OUTPUT VOLTAGE
OUTPUT RIPPLE
100
90
80
VOUT = +1.5V
VOUT
(AC-COUPLED)
10mV/div
η (%)
70
60
VOUT = +1.8V
VOUT = +1.1V
50
40
30
20
VIN = +12V
VOUT = +1.75V
IOUT = 52A
10
VIN = +12V
fSW = 250kHz
0
0 4 8 12 16 20 24 28 32 36 40 44 48 52
500ns/div
Figure 7. Output Ripple
IOUT (A)
Figure 10. Efficiency vs. Output Current and Output Voltage
EFFICIENCY vs. OUTPUT CURRENT
AND OUTPUT VOLTAGE
LOAD-TRANSIENT RESPONSE
100
90
80
70
η (%)
Evaluates MAX5037
MAX5037 Evaluation Kit
VOUT
50mV/div
VOUT = +1.5V
VOUT = +1.8V
60
50
VOUT = +1.1V
40
30
VIN = +12V
VOUT = +1.75V
ISTEP = 8A TO 52A
tRISE = 1µs
20
10
0
0 4 8 12 16 20 24 28 32 36 40 44 48 52
40µs/div
Figure 8. MAX5037 EV Kit Transient Response
8
VIN = +5V
fSW = 500kHz
IOUT (A)
Figure 11. Efficiency vs. Output Current and Output Voltage
_______________________________________________________________________________________
MAX5037 Evaluation Kit
VPGOOD
2V/div
VOUT
500mV/div
VIN = +12V
VOUT = +1.75V
IOUT = 0A
VIN
10V/div
2ms/div
Figure 12. Input Startup Response
INPUT STARTUP RESPONSE
VPGOOD
1V/div
VOUT
1V/div
VIN
5V/div
The MAX5037 offers inherent soft-start at turn-on
through its current-error amplifier compensation capacitors. The output rises monotonically without overshoot.
The output voltage reaches its specified range within
10ms of the input power reaching its operating voltage
range at full load. See Figures 12, 13, and 14.
Current Limiting
The average current-mode control technique of the
MAX5037 limits the maximum output current per phase
accurately. The MAX5037 senses and limits the peak
inductor current (IL-PK) across the sense resistor. Two
channels limit the current. The regular channel terminates the ON cycle when the current-sense voltage
reaches 48mV (typ). The faster channel, with only
260ns delay, terminates the ON cycle when the voltage
across the sense resistor reaches 112mV during output
short-circuit and inductor saturation. Use the following
equation to calculate the current limit:
 0.05 
IOUT = 
 × N
 R1// R2 
For the EV kit, current limit occurs at 63A typically with
RSENSE equal to 1.6mΩ. In case of a short circuit at the
output, the average output current is maintained at its
current-limit value.
External Synchronization with
CLKIN and CLKOUT
VIN = +12V
VOUT = +1.75V
IOUT = 52A
2ms/div
Figure 13. Input Startup Response
ENABLE STARTUP RESPONSE
VPGOOD
1V/div
Multiple MAX5037 EV kits can be paralleled to increase
output current capacity. The EV kit is provided with the
CLKIN input (JP4) and CLKOUT (JP5) output for easy
paralleling. The CLKOUT is phase delayed from CLKIN
or DH1 by an amount set by PHASE (JP3). A jumper
between pins 1 and 2 set the phase delay to 60°, a
jumper between pins 2 and 3 set the delay to 120°, and
the OPEN jumper sets the phase delay to 90°. Figures
15, 16, and 17 show the CLKOUT position with respect
to CLKIN and DH1 for 60°, 90°, and 120°, respectively.
VOUT
1V/div
VIN = +12V
VOUT = +1.75V
IOUT = 52A
VIN
2V/div
1ms/div
Figure 14. Enable Startup Response
_______________________________________________________________________________________
9
Evaluates MAX5037
Turn On
INPUT STARTUP RESPONSE
Evaluates MAX5037
MAX5037 Evaluation Kit
CLKOUT vs. CLKIN AND
DH 60° PHASE DELAY
FSW = 250kHz
VIN = 12V
VOUT = 1.75V
CLKOUT vs. CLKIN AND
DH 90° PHASE DELAY
FSW = 250kHz
VIN = 12V
VOUT = 1.75V
CLKIN
5V/div
DH1
20V/div
DH1
20V/div
DH2
20V/div
DH2
20V/div
CLKOUT
5V/div
CLKOUT
5V/div
400ns/div
400ns/div
Figure 15. CLKOUT vs. CLKIN and DH 60° Phase Delay
Figure 16. CLKOUT vs. CLKIN and DH 90° Phase Delay
CLKOUT vs. CLKIN AND
DH 120° PHASE DELAY
FSW = 250kHz
VIN = 12V
VOUT = 1.75V
CLKIN
5V/div
DH1
20V/div
DH2
20V/div
CLKOUT
5V/div
400ns/div
Figure 17. CLKOUT vs. CLKIN and DH 120° Phase Delay
10
CLKIN
5V/div
______________________________________________________________________________________
VIN+
HEATSINK-AAVIDI
HS2
HEATSINK-AAVIDI
HS1
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
30
31
CON1
VIN+
VINVIN+
VINVIN+
VINVIN+
VINRESRV VRM-PRES
KEY
VID4
VID3
VID2
VID1
VID0
RESRV
ISHARE
PWRGD
OUTEN
VO-SEN- VO-SEN+
RESRV
RESRV
VOVOVO+
VO+
VOVOVO+
VO+
VOVOVO+
VO+
VOVOVO+
VO+
VOVOVO+
VO+
VOVOVO+
VO+
VOVOVO+
VO+
VOVOVO+
VO+
VOVOVO+
VO+
VOVO-
62
61
60
59
58
57
56
55
54
53
52
51
50
49
48
47
46
45
44
43
42
41
40
39
38
37
36
35
34
33
32
+VOUT
VIN-
2
C38
470pF
C37
0.01µF
HEADER 3 PIN
1
R25
10kΩ
R18
1kΩ
3
SENSE-
SENSE+
PWRGD
OVPOUT
CLP1
OVPIN
SGND
VD0
VD1
VD2
VD3
44 43
R10
1kΩ
C35
0.01µF
12 13
R24
4.99kΩ
11
10
9
8
7
6
5
4
3
2
1
C36
470pF
CLP2
EAN
JP3
42
PLLCMP
14
41 40
R9
7.5kΩ
C34
4.7µF
R23
37.4kΩ
15 16
R22
37.4kΩ
EAOUT
PC BOARD EDGE CONNECTOR
PHASE
REG
HEADER 3 PIN
39 38
C33
470pF
U1
MAX5037
CSN2
CSP1
3
17 18
37
N.C.
36 35
20 21
R21
OPEN
19
EN
2
CLKOUT
SGND
1
SGND
N.C.
JP4
CSP2
CSN1
VD4
DIFF
CLKIN
CNTR
34
22
DL2
LX2
DH2
N.C.
C39
0.1µF
DH1
LX1
DL1
VDD
VCC
IN
PGND
BST2
BST1
23
24
25
26
27
28
29
30
31
32
33
R8
2.2Ω
C40
1µF
C45
0.1µF
R17
1Ω
R16
0Ω
2
R13
0Ω
C41
0.47µF/16V
R20
0Ω
R15
3.3Ω
C43
4.7µF
C44
0.1µF
MBR0520LT1
MBR05020LT1
D3
D4
C32
0.47µF/16V
R7
3.3Ω
1
R12
0Ω
D2
R1
2.7mΩ
R19
OPEN
L1
0.6µH/27A
R3
2.7mΩ
L2
0.6µH/27A
MBRS340T3
Q3 Q4
Si7886DP
D1
Q1 Q2
Si7860DP
C3 C4 C5 C6 C7
5X 22µF/
16V X5R
Q7 Q8
Si7886DP
MBRS340T3
R6
OPEN
C31
0.01µF
4X 22µF/16V X5R
C8 C9 C10 C11
Q5 Q6
Si7860DP
R5
10Ω
C42
0Ω
R2
2.7mΩ
10X 270µF/2V
C12 C13 C14
C15 C16 C17
C18 C19 C20
C21
R14
49.9Ω
6X 10µF/6.3V
C24 C25 C26
C27 C28 C29
R11
49.9Ω
C1 C2
2X 47µF/16 X5R
2X 100µF/6.3V
C22 C23
R4
2.7mΩ
C30
0Ω
SCR1
S1012D
-VSENSE
-VO
1.1 TO 1.85V/52A
+VOUT
+VSENSE
VIN-
12V
VIN+
Evaluates MAX5037
JP5
1 2
HEADER 2 PIN
MAX5037 Evaluation Kit
Figure 18. MAX5037 EV Kit Schematic
______________________________________________________________________________________
11
Evaluates MAX5037
MAX5037 Evaluation Kit
EV Kit Layout
1.0"
Figure 19. MAX5037 EV Kit Component Placement Guide—
Component Side
1.0"
Figure 21. MAX5037 EV Kit PC Board Layout—Inner Layer 2
12
1.0"
Figure 20. MAX5037 EV Kit PC Board Layout—Component Side
1.0"
Figure 22. MAX5037 EV Kit PC Board Layout—Inner Layer 3
______________________________________________________________________________________
MAX5037 Evaluation Kit
1.0"
1.0"
Figure 23. MAX5037 EV Kit PC Board Layout—Solder Side
Figure 24. MAX5037 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 ____________________ 13
© 2003 Maxim Integrated Products
Printed USA
is a registered trademark of Maxim Integrated Products.
Evaluates MAX5037
EV Kit Layout (continued)