MAX16932 [MAXIM]
fully assembled and tested application circuit for the MAX16932 highvoltage;
| 型号： | MAX16932 |
| 厂家： | 
MAXIM INTEGRATED PRODUCTS |
| 描述： | fully assembled and tested application circuit for the MAX16932 highvoltage |
| 文件： | 总11页 (文件大小：580K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
Evaluates: MAX16932, MAX16933
MAX16932 Evaluation Kit
General Description
Quick Start
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.
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.
Benefits and Features
● Dual, Synchronous Step-Down Controllers Operate
at 180° Out-of-Phase to Reduce Switching Noise
1) Verify that all jumpers are in their default configura-
tions according to Table 1.
● 3.5V to 36V Wide Input Supply Range
● Buck Output Voltage: 5V and 3.3V Fixed or
2) Connect the positive and negative terminals of the
power supply to the VBATF and PGND test pads,
respectively.
Adjustable Between 1V and 10V
● Current-Mode Controllers with Forced-PWM and Skip
Modes
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.
● Resistor-Programmable Frequency Between 1MHz
and 2.2MHz
● Frequency Synchronization Input
● Independent Enable Inputs
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.
● Voltage Monitoring PGOOD_ Outputs
● Fully Assembled and Tested
5) Set the power-supply voltage to 14V.
6) Turn on the power supply.
EV Kit Contents
● MAX16932 EV Kit Board
7) Enable the electronic loads.
8) Verify that VOUT1 is approximately 5V.
9) Verify that VOUT2 is approximately 3.3V.
Ordering Information appears at end of data sheet.
19-6806; Rev 0; 9/13
Evaluates: MAX16932, MAX16933
MAX16932 Evaluation Kit
Table 1. Default Jumper Settings
JUMPER
JU1, JU2
JU6
DEFAULT SHUNT POSITION
FUNCTION
1-2
1-2
Buck outputs enabled.
Forced-PWM mode.
JU7
1-2
Switches to EXTVCC. Internal regulator disabled.
PGOOD_ pulls up to VBIAS when OUT_ is in regulation.
JU8, JU9
Installed
Table 2. Enable Control (JU1, JU2)
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_.
SHUNT
POSITION
EN_ PIN
VOUT_
1-2*
Connected to VBAT
Connected to PGND
Enabled
Disabled
2-3
*Default configuration.
Table 3. Mode of Operation (JU6)
Switching Frequency/
External Synchronization
SHUNT
POSITION
FSYNC
PIN
MODE
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.
1-2*
2-3
Connected to BIAS
Connected to AGND
Forced-PWM mode
Skip mode
*Default configuration.
Table 4. EXTVCC (JU7)
SHUNT
POSITION
EXTVCC
BIAS
Enable Control
PIN
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.
Switches to EXTVCC.
Internal regulator
disabled.
Connected to
VOUT1
1-2
1-3*
1-4
Connected to
PGND
Internal regulator
enabled.
Mode of Operation
Switches to EXTVCC.
Internal regulator
disabled.
Connected to
VOUT2
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.
*Default configuration.
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 V
drops below V
=
EXTVCC
TH,EXTVCC
3.1V(min), the internal regulator enables and switches
back to BIAS. See Table 4.
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Evaluates: MAX16932, MAX16933
MAX16932 Evaluation Kit
Buck Output Monitoring (PGOOD_)
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:
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 regulator 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.
1) Replace U1 with the MAX16933 IC.
2) Replace R136 (R
) with 80.6kΩ to achieve 400kHz
FOSC
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.
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:
V
OUT1
R119 = R120
−1
V
FB1
where V
= 1V (typ).
FB1
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:
V
OUT2
R131= R132
−1
V
FB2
where V
= 1V (typ).
FB2
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Evaluates: MAX16932, MAX16933
MAX16932 Evaluation Kit
Component List
DESIGNATION
QTY
DESCRIPTION
DESIGNATION
QTY
DESCRIPTION
Not installed, ceramic capacitors
(2220)
0.1µF ±10%, 50V X7R ceramic
capacitors (0603)
Murata GRM188R71H104K
C117, C118
0
C1, C2, C3,
C75, C83
5
200mA, 30V diodes (SOT23)
Fairchild BAT54
D20, D21
D22, D23
2
2
C4, C5,
C100–C103,
C105–C108,
C111, C112,
C119, C120
3A, 60V Schottky diodes (SMB)
Diodes B360B-13-F
Not installed, ceramic capacitors
(0603)
0
FSYNC
JU1, JU2, JU6
JU7
0
3
1
2
Not installed, test point
3-pin headers
47µF ±20%, 16V X7R ceramic
capacitor (2220)
TDK CGA9N3X7R1C476M
C76, C77,
C84, C85
4-pin header
4
2
1
1
1
1
1
6
JU8, JU9
2-pin headers
2.2µH, 12A power inductors
Vishay IHLP4040DZER2R2M01
4700pF ±10%, 50V X7R ceramic
capacitors (0402)
Murata GRM155R71H472K
L7, L8
2
2
C78, C86
C79
PGOOD1,
PGOOD2
Test points
22pF ±5%, 50V C0G ceramic
capacitor (0402)
Murata GRM1555C1H220J
40V, 7.6A n-channel MOSFETs
(8 SO)
Fairchild FDS8449
Q13–Q16
R1, R2
4
2
6.8µF ±10%, 16V X7R ceramic
capacitor (1206)
TDK C3216X7R1C685K
1kΩ ±5% resistors (0603)
C81
R113, R114,
R115, R117,
R118, R122,
R125, R126,
R127, R129,
R130, R134,
R162, R166
2.2µF ±10%, 10V X7R ceramic
capacitor (0603)
Murata GRM188R71A225K
C82
14
0Ω ±5% resistors (0603)
33pF ±5% 50V C0G ceramic
capacitor (0402)
Murata GRM1555C1H330J
C87
0.015Ω ±1%, 0.5W sense
resistors (1206)
Panasonic ERJ-8BWFR015V
IRC LRF1206LF-01-R015-F
47µF, 50V aluminum electrolytic
capacitor (E)
Panasonic EEE-FK1H470P
R116, R128
2
0
C88
4.7µF ±10%, 50V X7R ceramic
capacitors (1210)
Murata GCM32ER71H475KA55L
R119, R120,
R121, R131,
R132, R133,
R146, R147,
R161, R165
C90–C93, C97,
C116
Not installed, resistors (0603)
R123
R124
1
1
22.1kΩ ±1% resistor (0603)
1Ω ±5% resistor (0603)
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Evaluates: MAX16932, MAX16933
MAX16932 Evaluation Kit
Component List (continued)
DESIGNATION
R135
QTY
DESCRIPTION
14kΩ ±1% resistor (0603)
13.7kΩ ±1% resistor (0603)
100kΩ ±1% resistor (0603)
51.1kΩ ±5% resistors (0603)
DESIGNATION
QTY
DESCRIPTION
1
1
1
2
Automotive dual buck
(28 TQFN-EP*)
Maxim MAX16932ATIR/V+
U1
1
R136
R137
—
—
6
1
Shunts
R156, R157
PCB: MAX16932 EVKIT
*EP = Exposed pad.
Component Suppliers
SUPPLIER
Diodes, Inc.
PHONE
WEBSITE
805-446-4800
888-522-5372
361-992-7900
770-436-1300
800-344-2112
847-803-6100
402-563-6866
www.diodes.com
Fairchild Semiconductor
IRC, Inc.
www.fairchildsemi.com
www.irctt.com
Murata Electronics North America, Inc.
Panasonic Corp.
TDK Corp.
www.murata-northamerica.com
www.panasonic.com
www.component.tdk.com
www.vishay.com
Vishay
Note: Indicate that you are using the MAX16932 when contacting these component suppliers.
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Evaluates: MAX16932, MAX16933
MAX16932 Evaluation Kit
Figure 1. MAX16932 EV Kit Schematic
Maxim Integrated
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Evaluates: MAX16932, MAX16933
MAX16932 Evaluation Kit
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1
1
1.0”
Figure 2. MAX16932 EV Kit Component Placement Guide—Component Side
1.0”
Figure 3. MAX16932 EV Kit PCB Layout—Component Side
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Evaluates: MAX16932, MAX16933
MAX16932 Evaluation Kit
1.0”
Figure 4. MAX16932 EV Kit PCB Layout—Layer 2
1
2
1
1
2
2
1
1
1
1
1
2
3
1
2
3
31
30
32
33
29
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2
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1
1
2
3
2
1
1
3
1
2
4
1
2
1
2
1
1
1.0”
Figure 5. MAX16932 EV Kit PCB Layout—Layer 3
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Evaluates: MAX16932, MAX16933
MAX16932 Evaluation Kit
1
2
1
1
2
2
1
1
1
1
1
2
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1
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1
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33
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1
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2
2
1
3
2
1
1
3
2
1
4
2
1
1
2
1
2
1
1
1.0”
Figure 6. MAX16932 EV Kit PCB Layout—Solder Side
1
2
1
1
2
2
1
1
1
1
1
2
3
1
2
3
31
30
32
33
29
2
1
2
1
2
1
1
2
2
1
1
2
3
2
1
1
3
1
2
4
1
2
1
2
1
1
1.0”
Figure 7. MAX16932 EV Kit Component Placement Guide—Solder Side
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Evaluates: MAX16932, MAX16933
MAX16932 Evaluation Kit
Ordering Information
PART
TYPE
EV Kit
MAX16932EVKIT#
#Denotes RoHS compliant.
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Evaluates: MAX16932, MAX16933
MAX16932 Evaluation Kit
Revision History
REVISION REVISION
PAGES
CHANGED
DESCRIPTION
NUMBER
DATE
0
9/13
Initial release
—
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.
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 specifications without notice at any time.
©
Maxim Integrated and the Maxim Integrated logo are trademarks of Maxim Integrated Products, Inc.
2013 Maxim Integrated Products, Inc.
│ 11
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