Evaluates: MAX16932, MAX16933
MAX16932 Evaluation Kit
General Description
The MAX16932 evaluation kit (EV kit) is a fully assembled
and tested application circuit for the MAX16932 high-
voltage, dual synchronous step-down controller. The EV
kit is set up to provide 5V and 3.3V from an input voltage
ranging from 3.5V to 36V. Each buck rail can deliver up
to 5A load current. The EV kit’s switching frequency is set
at 2.2MHz for both buck converters. Various jumpers are
provided to help evaluate features of the MAX16932 IC.
Benets and Features
●Dual, Synchronous Step-Down Controllers Operate
at 180° Out-of-Phase to Reduce Switching Noise
●3.5V to 36V Wide Input Supply Range
●Buck Output Voltage: 5V and 3.3V Fixed or
Adjustable Between 1V and 10V
●Current-Mode Controllers with Forced-PWM and Skip
Modes
●Resistor-Programmable Frequency Between 1MHz
and 2.2MHz
●Frequency Synchronization Input
●Independent Enable Inputs
●Voltage Monitoring PGOOD_ Outputs
●Fully Assembled and Tested
EV Kit Contents
●MAX16932 EV Kit Board
Quick Start
Recommended Equipment
• MAX16932 EV kit
• 3.5V to 36V, 15A power supply
• Two voltmeters
• Two electronic loads capable of sinking 5A each
Procedure
The EV kit is fully assembled and tested. Follow the steps
below to activate the board. Caution: Do not turn on the
power supply until all connections are completed.
1) Verify that all jumpers are in their default configura-
tions according to Table 1.
2) Connect the positive and negative terminals of the
power supply to the VBATF and PGND test pads,
respectively.
3) Connect the positive terminal of the first electronic
load to the VOUT1 test pad. Connect the ground
terminal of the electronic load to the corresponding
PGND test pad.
4) Connect the positive terminal of the second electronic
load to the VOUT2 test pad. Connect the ground
terminal of the electronic load to the corresponding
PGND test pad.
5) Set the power-supply voltage to 14V.
6) Turn on the power supply.
7) Enable the electronic loads.
8) Verify that VOUT1 is approximately 5V.
9) Verify that VOUT2 is approximately 3.3V.
19-6806; Rev 0; 9/13
Ordering Information appears at end of data sheet.
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MAX16932 Evaluation Kit
Detailed Description of Hardware
The MAX16932 EV kit, which evaluates the MAX16932
high-voltage, dual synchronous step-down controller, can
supply up to two rails. The EV kit includes two current-
mode buck outputs that are fixed to 5V and 3.3V, or pro-
grammable from 1V to 10V with external resistor-dividers.
The current capability is 5A per rail. Both outputs are cur-
rent limited and can be controlled independently through
their respective enable inputs EN_.
Switching Frequency/
External Synchronization
The EV kit switching frequency can be adjusted from
1MHz to 2.2MHz by changing the FOSC resistor R136.
The EV kit can also be synchronized to an external clock
by connecting the external clock signal to the FSYNC
test point. Refer to the Switching Frequency/External
Synchronization section in the MAX16932 IC data sheet
for more details.
Enable Control
The EV kit features jumper JU1 to independently control
the enable input of VOUT1 and jumper JU2 to control the
enable input of VOUT2. Connect the EN_ pin to VBAT
(pins 1-2) to enable VOUT_. Connect the EN_ pin to
ground (pins 2-3) to disable VOUT_. See Table 2.
Mode of Operation
The EV kit features jumper JU6 to configure the mode
switch-control input (Table 3). Drive FSYNC high (pins 1-2
of JU6) to enable forced-PWM mode. Drive FSYNC low
(pins 2-3 of JU6) to enable skip mode under light loads.
EXTVCC Switchover Comparator
The internal linear regulator can be bypassed by con-
necting an external supply (3.1V to 5.2V) or the output
of one of the buck converters to EXTVCC. BIAS inter-
nally switches to EXTVCC and the internal linear regu-
lator turns off. If VEXTVCC drops below VTH,EXTVCC =
3.1V(min), the internal regulator enables and switches
back to BIAS. See Table 4.
Table 4. EXTVCC (JU7)
SHUNT
POSITION
EXTVCC
PIN BIAS
1-2 Connected to
VOUT1
Switches to EXTVCC.
Internal regulator
disabled.
1-3* Connected to
PGND
Internal regulator
enabled.
1-4 Connected to
VOUT2
Switches to EXTVCC.
Internal regulator
disabled.
*Default configuration.
*Default configuration.
*Default configuration.
JUMPER DEFAULT SHUNT POSITION FUNCTION
JU1, JU2 1-2 Buck outputs enabled.
JU6 1-2 Forced-PWM mode.
JU7 1-2 Switches to EXTVCC. Internal regulator disabled.
JU8, JU9 Installed PGOOD_ pulls up to VBIAS when OUT_ is in regulation.
SHUNT
POSITION EN_ PIN VOUT_
1-2* Connected to VBAT Enabled
2-3 Connected to PGND Disabled
SHUNT
POSITION
FSYNC
PIN MODE
1-2* Connected to BIAS Forced-PWM mode
2-3 Connected to AGND Skip mode
Table 1. Default Jumper Settings
Table 3. Mode of Operation (JU6)
Table 2. Enable Control (JU1, JU2)
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MAX16932 Evaluation Kit
Buck Output Monitoring (PGOOD_)
The EV kit provides two power-good output test points
(PGOOD1 and PGOOD2) to monitor the status of the two
buck outputs (OUT1 and OUT2). Each PGOOD_ goes high
(high impedance) when the corresponding regulator output
voltage is in regulation. Each PGOOD_ goes low when
the corresponding regula tor output voltage drops below
15% (typ) or rises above 10% (typ) of its nominal regulated
voltage. PGOOD_ asserts low during soft-start and in shut-
down. PGOOD_ becomes high impedance when OUT_ is
in regulation. To obtain a logic signal, pull up PGOOD_ to
VBIAS by installing shunts on JU8 and JU9.
Setting the Output Voltage in Buck
Converters
To externally adjust the output voltage OUT1 between 1V
and 10V, remove R122 and install a 0Ω resistor on R121.
Connect a resistive divider from the output OUT1 to FB1
to AGND. Place appropriate resistors in positions R58
and R119 and R120 according to the following equation:
OUT1
FB1
V
R119 R120 1
V
= −
where VFB1 = 1V (typ).
To externally adjust the output voltage OUT2 between 1V
and 10V, remove R132 and install a 0Ω resistor on R133.
Connect a resistive divider from the output OUT2 to FB2
to GND. Place appropriate resistors in positions R131 and
R132 according to the following equation:
OUT2
FB2
V
R131 R132 1
V
= −
where VFB2 = 1V (typ).
Evaluating the MAX16933 on the
MAX16932 EV Kit
The MAX16932 EV kit can be modified to operate the
MAX16933. The MAX16933 operates at a switching fre-
quency of 400kHz, which requires a change in the follow-
ing components:
1) Replace U1 with the MAX16933 IC.
2)
Replace R136 (R
FOSC
) with 80.6kΩ to achieve 400kHz
switching frequency.
3) Replace the buck inductors (L7, L8) with a 6.8µH 7A
inductor.
Contact Technical Support at www.maximintegrated.
com/support for any further questions.
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MAX16932 Evaluation Kit
Component List
DESIGNATION QTY DESCRIPTION
C1, C2, C3,
C75, C83 5
0.1µF ±10%, 50V X7R ceramic
capacitors (0603)
Murata GRM188R71H104K
C4, C5,
C100–C103,
C105–C108,
C111, C112,
C119, C120
0Not installed, ceramic capacitors
(0603)
C76, C77,
C84, C85 4
47µF ±20%, 16V X7R ceramic
capacitor (2220)
TDK CGA9N3X7R1C476M
C78, C86 2
4700pF ±10%, 50V X7R ceramic
capacitors (0402)
Murata GRM155R71H472K
C79 1
22pF ±5%, 50V C0G ceramic
capacitor (0402)
Murata GRM1555C1H220J
C81 1
6.8µF ±10%, 16V X7R ceramic
capacitor (1206)
TDK C3216X7R1C685K
C82 1
2.2µF ±10%, 10V X7R ceramic
capacitor (0603)
Murata GRM188R71A225K
C87 1
33pF ±5% 50V C0G ceramic
capacitor (0402)
Murata GRM1555C1H330J
C88 1
47µF, 50V aluminum electrolytic
capacitor (E)
Panasonic EEE-FK1H470P
C90–C93, C97,
C116 6
4.7µF ±10%, 50V X7R ceramic
capacitors (1210)
Murata GCM32ER71H475KA55L
DESIGNATION QTY DESCRIPTION
C117, C118 0 Not installed, ceramic capacitors
(2220)
D20, D21 2 200mA, 30V diodes (SOT23)
Fairchild BAT54
D22, D23 2 3A, 60V Schottky diodes (SMB)
Diodes B360B-13-F
FSYNC 0 Not installed, test point
JU1, JU2, JU6 3 3-pin headers
JU7 1 4-pin header
JU8, JU9 2 2-pin headers
L7, L8 2 2.2µH, 12A power inductors
Vishay IHLP4040DZER2R2M01
PGOOD1,
PGOOD2 2 Test points
Q13–Q16 4
40V, 7.6A n-channel MOSFETs
(8 SO)
Fairchild FDS8449
R1, R2 2 1kΩ ±5% resistors (0603)
R113, R114,
R115, R117,
R118, R122,
R125, R126,
R127, R129,
R130, R134,
R162, R166
14 0Ω ±5% resistors (0603)
R116, R128 2
0.015Ω ±1%, 0.5W sense
resistors (1206)
Panasonic ERJ-8BWFR015V
IRC LRF1206LF-01-R015-F
R119, R120,
R121, R131,
R132, R133,
R146, R147,
R161, R165
0 Not installed, resistors (0603)
R123 1 22.1kΩ ±1% resistor (0603)
R124 1 1Ω ±5% resistor (0603)
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MAX16932 Evaluation Kit
Component Suppliers
Component List (continued)
*EP = Exposed pad.
Note: Indicate that you are using the MAX16932 when contacting these component suppliers.
SUPPLIER PHONE WEBSITE
Diodes, Inc. 805-446-4800 www.diodes.com
Fairchild Semiconductor 888-522-5372 www.fairchildsemi.com
IRC, Inc. 361-992-7900 www.irctt.com
Murata Electronics North America, Inc. 770-436-1300 www.murata-northamerica.com
Panasonic Corp. 800-344-2112 www.panasonic.com
TDK Corp. 847-803-6100 www.component.tdk.com
Vishay 402-563-6866 www.vishay.com
DESIGNATION QTY DESCRIPTION
R135 1 14kΩ ±1% resistor (0603)
R136 1 13.7kΩ ±1% resistor (0603)
R137 1 100kΩ ±1% resistor (0603)
R156, R157 2 51.1kΩ ±5% resistors (0603)
DESIGNATION QTY DESCRIPTION
U1 1
Automotive dual buck
(28 TQFN-EP*)
Maxim MAX16932ATIR/V+
— 6 Shunts
— 1 PCB: MAX16932 EVKIT
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Evaluates: MAX16932, MAX16933
MAX16932 Evaluation Kit
Figure 1. MAX16932 EV Kit Schematic
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Evaluates: MAX16932, MAX16933
MAX16932 Evaluation Kit
Figure 2. MAX16932 EV Kit Component Placement Guide—Component Side
Figure 3. MAX16932 EV Kit PCB Layout—Component Side
1
2
1
2
1
2
1 2
1
2
1 2
11
1
1
2
1
2
1
2
1
2
1
2
1
2
1
2
1
2
1
2
1
2
1
2
1
2
1
2
1
2
1
2
1
2
1
2
12
1
2
1
2
1
2
3
45
6
7
81
2
3
4 5
6
7
8
1
2
3
4 5
6
7
8
1
2
3
45
6
7
8
1
2
1
2
123
12
3
4
1 2
1 2
1 2 1 2
1 2
12
1
2
1
2
1
2
1
2
1
2
1
2
1
2
1
2
1
2
1
2
1
1 2
1
2
3
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5
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7
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31 32
33
1
2
3
1
2
3
1
2
1
2
1
2
1 2
1 2
3
1 2
3
1
2
1
2
1
2
1
2
1
2
1
2
1
2
1
2
1
1
2
1
2
1
1
1.0”
1.0”
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MAX16932 Evaluation Kit
Figure 4. MAX16932 EV Kit PCB Layout—Layer 2
Figure 5. MAX16932 EV Kit PCB Layout—Layer 3
1.0”
1 2
1 2
11
1
12 1 2 1 212
1
2
1
2
1
2
1
2
123
12
3
4
1 2
1 2
1 2 1 2
1 2
12
1
2
1
2
1
2
1
2
1
21
21
2
1
2
1
2
1
21
2
1
2 1
2
1
2
1
2
1
2
1
2
1
2
1
2
1
1 2
29
30
31 32
33
1
2
3
1
2
3
1
1
1
1.0”
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MAX16932 Evaluation Kit
Figure 6. MAX16932 EV Kit PCB Layout—Solder Side
Figure 7. MAX16932 EV Kit Component Placement Guide—Solder Side
1
2
1
2
1
2
1 2
1
2
1 2
11
1
1
2
1
2
1
2
1
2
1
2
1
2
1
2
1
2
1
2
1
2
1
2
1
2
1
2
1
2
1
2
1
2
1
2
12
1
2
1
2
1
2
3
45
6
7
81
2
3
4 5
6
7
8
1
2
3
4 5
6
7
8
1
2
3
45
6
7
8
1
2
1
2
123
12
3
4
1 2
1 2
1 2 1 2
1 2
12
1
2
1
2
1
2
1
2
1
2
1
2
1
2
1
2
1
2
1
2
1
1 2
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 32
33
1
2
3
1
2
3
1
2
1
2
1
2
1 2
1 2
3
1 2
3
1
2
1
2
1
2
1
2
1
2
1
2
1
2
1
2
1
1
2
1
2
1
1
1.0”
1 2
1 2
11
1
12 1 2 1 212
1
2
1
2
1
2
1
2
123
12
3
4
1 2
1 2
1 2 1 2
1 2
12
1
2
1
2
1
2
1
2
1
21
21
2
1
2
1
2
1
21
2
1
2 1
2
1
2
1
2
1
2
1
2
1
2
1
2
1
1 2
29
30
31 32
33
1
2
3
1
2
3
1
1
1
1.0”
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MAX16932 Evaluation Kit
#Denotes RoHS compliant.
PART TYPE
MAX16932EVKIT# EV Kit
Ordering Information
Maxim Integrated cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim Integrated product. No circuit patent licenses
are implied. Maxim Integrated reserves the right to change the circuitry and specications without notice at any time.
Maxim Integrated and the Maxim Integrated logo are trademarks of Maxim Integrated Products, Inc. © 2013 Maxim Integrated Products, Inc.
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MAX16932 Evaluation Kit
REVISION
NUMBER
REVISION
DATE DESCRIPTION PAGES
CHANGED
0 9/13 Initial release —
Revision History
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim Integrated’s website at www.maximintegrated.com.
