19-3411; Rev 0; 9/04
MAX5927 Evaluation Kit
General Description
The MAX5927 evaluation kit (EV kit) is a fully assembled
and tested surface-mount quad hot-swap controller/
power-sequencer/voltage-tracker circuit board,
which provides current limiting and VariableSpeed/
BiLevel™ fault protection on all four channels. The circuit
uses the MAX5927 in a 32-pin thin QFN package and is
configurable for a 1.0V to 13.2V input range. The
MAX5927 features a configurable latch/autoretry fault
mode, circuit-breaker function, and programmable under-
voltage lockout (UVLO).
The EV kit is configured to demonstrate four separate
input voltages: 5V, 3.3V, 2.5V, and 1.8V. The 5V input is
configured for 0.5A of output current, while the 3.3V
input is configured for 1.5A of output current. The 2.5V
and 1.8V inputs are each configured for 5A of output
current. The MAX5927 controls four n-channel power
MOSFETs and provides current regulation during start-
up for all four inputs. Several configurations allow the
MAX5927’s unique current regulation architecture to be
tailored to the application. The current limiting and
short-circuit protection features are configurable and
demonstrate the various features of the MAX5927.
The EV kit has several configurations for the startup
timer setting, current limit, and voltage-tracking/power-
sequencing/independent modes of operation. The EV
kit also provides independent turn-on delays for
the four outputs, independent on/off control, and inde-
pendent status reports of all four channels. The
MAX5927 EV kit can also be reconfigured to emulate a
MAX5929 (quad hot swap), MAX5930 (triple hot swap),
or MAX5931 (triple hot swap) design.
Features
♦
Input Voltages
5V, VIN1 (as Configured)
3.3V, VIN2 (as Configured)
2.5V, VIN3 (as Configured)
1.8V, VIN4 (as Configured)
♦
Configurable Voltage-Tracking/Power-
Sequencing/Independent Operation Modes
♦
Independent On/Off Control and Status Reports
for Each Channel
♦
Outputs
VOUT1: 5V, 0.5A (Configurable for Up to 1A)
VOUT2: 3.3V, 1.5A (Configurable for Up to 3A)
VOUT3: 2.5V, 5A (Configurable for Up to 10A)
VOUT4: 1.8V, 5A (Configurable for Up to 10A)
♦
Configurable 25mV Current-Trip Threshold
♦
Demonstrates Unique Current-Regulation
Architecture and Circuit-Breaker Function
♦
Configurable Startup Timer
♦
Configurable Input Undervoltage Monitoring
(All Inputs)
♦
Emulates MAX5929, MAX5930, or MAX5931 IC
Functions
♦
Surface-Mount Components
♦
Fully Assembled and Tested
Evaluates: MAX5927
Ordering Information
PART
MAX5927EVKIT
TEMP RANGE
0°C to +70°C
IC-PACKAGE
32 Thin QFN
Component Suppliers
SUPPLIER
Central Semiconductor
Fairchild
IRC
Murata
Sanyo USA
Taiyo Yuden
Toshiba
Vishay
PHONE
631-435-1110
888-522-5372
361-992-7900
770-436-1300
619-661-6322
800-348-2496
949-455-2000
N/A
FAX
631-435-1824
N/A
361-992-3377
770-436-3030
619-661-1055
847-925-0899
949-859-3963
N/A
WEBSITE
www.centralsemi.com
www.fairchildsemi.com
www.irctt.com
www.murata.com
www.sanyovideo.com
www.t-yuden.com
www.toshiba.com/taec
www.vishay.com
Note:
Indicate that you are using the MAX5927 when contacting these component suppliers.
VariableSpeed/BiLevel is a trademark of Maxim Integrated Products, Inc.
________________________________________________________________
Maxim Integrated Products
1
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.
MAX5927 Evaluation Kit
Evaluates: MAX5927
Component List
DESIGNATION QTY
C1
1
DESCRIPTION
100µF, 16V OS-CON capacitor
(E case)
Sanyo 16SA100M
150µF, 16V OS-CON capacitor
(F case)
Sanyo 16SA150M
1000µF, 16V OS-CON capacitors
(H case)
Sanyo 16SA1000M
0.1µF ±10%, 25V X7R ceramic
capacitors (0805)
Murata GRM21BR71E104K
0.22µF ±10%, 16V X7R ceramic
capacitor (0805)
Murata GRM21BR71C224K
0.15µF ±10%, 25V X7R ceramic
capacitor (0805)
Murata GRM21BR71E154K
0.068µF ±10%, 25V X7R ceramic
capacitor (0805)
Murata GRM219R71E683K
1000pF ±10%, 50V X7R ceramic
capacitor (0603)
Taiyo Yuden UMK107B102KZ
1µF ±10%, 16V X7R ceramic
capacitors (0805)
Murata GRM21BR71C105K
Not installed, OS-CON capacitor
(E case)
Not installed, OS-CON capacitor
(F case)
Not installed, OS-CON capacitors (H
case)
1A 20V Schottky diode (SMA)
Central Semiconductor
CMSH1-20M
DESIGNATION QTY
D2, D3, D4
3
DESCRIPTION
3A 30V Schottky diodes (M-Flat)
Toshiba CMS02
7.5V 500mW zener diode (SOD-123)
Central Semiconductor CMHZ5236B
7-pin headers
2-pin headers
3-pin headers
20V, 3A n-channel MOSFET
(SuperSOT-3)
Fairchild FDN339AN
30V, 13A n-channel MOSFET (SO-8)
Fairchild FDS6670A
30V, 100A n-channel MOSFETs
(D
2
PAK)
Fairchild FDB7045L
0.042Ω ±1%, 0.5W sense resistor
(1206)
IRC LRC1206-R042-F or
Vishay WSL1206R0420FSA
0.013Ω ±1%, 0.5W sense resistor
(1206)
IRC LRF1206-R013-F
0.0042Ω ±1%, 1.5W sense resistors
(2512)
Vishay WSL25124L200FBA or
IRC LRF2512-R004-F
100kΩ ±1% resistors (0805)
4.02kΩ ±1% resistor (0805)
49.9kΩ ±1% resistor (0805)
3.32kΩ ±1% resistors (0805)
1.87kΩ ±1% resistor (0805)
412kΩ ±1% resistor (0805)
1kΩ ±5% resistors (0805)
D5
J1, J2
JU1–JU4, JU6,
JU7, JU9–JU12
JU5, JU8
N1
1
2
10
2
1
C2
1
C3, C4
2
C5–C8, C12
5
C9
1
N2
1
N3, N4
2
C10
1
C11
1
R1
1
C13
1
R2
1
C14–C17
4
R3, R4
2
C18
C19
C20, C21
0
0
0
R5–R8, R16,
R19, R22, R25
R9
R10
R11, R13, R14
R12
R15
R17, R20, R23,
R26
8
1
1
3
1
1
4
D1
1
2
_______________________________________________________________________________________
MAX5927 Evaluation Kit
Component List (continued)
DESIGNATION QTY
R18
R21
R24
R27
R28, R29
R30, R31
R32–R35
SW1–SW4
VIN1–VIN4,
VOUT1–VOUT4,
PGND, PGND,
PGND, PGND
U1
None
None
1
1
1
0
2
2
4
4
DESCRIPTION
237kΩ ±1% resistor (0805)
158kΩ ±1% resistor (0805)
84.5kΩ ±1% resistor (0805)
Not installed, resistor (0805)
10kΩ ±5% resistors (0805)
1kΩ ±5% resistors (0805)
5.1kΩ ±5% resistors (0805)
SPST momentary contact switches
4) Verify that shunts are not installed on jumpers JU7
(POL, normal logic polarity) and JU8 (MODE,
power-sequencing mode).
5) Verify that a shunt is installed on jumpers JU9
(ON1, C9 delay capacitor), JU10 (ON2, C10 delay
capacitor), JU11 (ON3, C11 delay capacitor), and
JU12 (ON4, C12 delay capacitor).
6) Connect the 5V power supply to the VIN1 banana
jack and the supply ground to the PGND banana
jack.
7)
Utilizing very short 10A-rated banana leads (<6in
long),
connect the 5V, 3.3V, 2.5V, and 1.8V DC
power supplies to the VIN1, VIN2, VIN3, and VIN4
metal banana jacks, respectively.
Utilizing very
short 10A-rated banana leads (<6in long),
connect
the supply grounds to the respective PGND metal
banana jacks.
8) Connect the voltmeter to the VOUT1 and PGND pads.
9) Turn on all four power supplies and verify the fol-
lowing output voltages:
VOUT1 = 5V
VOUT2 = 3.3V
VOUT3 = 2.5V
VOUT4 = 1.8V
10) Pressing pushbutton switches SW1–SW4 resets
their respective outputs (VOUT1–VOUT4).
11) Test points TP1–TP4 and GND pads nearby are
provided to observe their respective MOSFET gate
voltages with an oscilloscope.
Note:
The banana leads connecting the power supplies
and their respective load to the EV kit must be very short
(<6in long) and rated for at least 10A of current.
Evaluates: MAX5927
12
Uninsulated banana jacks
1
12
4
MAX5927ETJ (32-pin thin QFN, 5mm
x 5mm)
Shunts (JU1–JU12)
Rubber bumpers
Quick Start
The MAX5927 EV kit is fully assembled and tested.
Follow these steps to verify board operation.
Do not
turn on the power supplies until all connections are
completed.
Required Equipment
• One 5V, 1A-capable power supply (2A for maximum
current-limit configuration)
• One 3.3V, 3A-capable power supply (6A for maxi-
mum current-limit configuration)
• One 2.5V, 10A-capable power supply (20A for maxi-
mum current-limit configuration)
• One 1.8V, 10A-capable power supply (20A for maxi-
mum current-limit configuration)
• One voltmeter for confirming output voltages
Detailed Description
The MAX5927 EV kit is a quad hot-swap controller circuit
board configured to four different input voltages: 5V input
(VIN1), 3.3V input (VIN2), 2.5V input (VIN3), and 1.8V
input (VIN4). All four inputs have separate and indepen-
dent current limiting, VariableSpeed/BiLevel fault protec-
tion, and circuit-breaker functions. The EV kit uses a
MAX5927ETJ IC in a 32-pin thin QFN package to control
the four channels of the circuit. The EV kit can be recon-
figured for any input voltage between 1.0V and 13.2V,
given that at least one input voltage is
≥
2.7V.
The EV kit features several modes of operation that are
jumper configurable (JU8): voltage-tracking mode,
power-sequencing mode, and independent mode. In
the voltage-tracking mode, the MAX5927 turns all
channels on and off together. When the EV kit is config-
ured for the power-sequencing mode, the MAX5927
3
MAX5927 Configuration (All Outputs)
1) Verify that shunts are installed on jumpers
(ILIM1, 0.5A), JU2 (ILIM2, 1.5A), JU3 (ILIM3,
and JU4 (ILIM4, 5A).
2) Verify that a shunt is installed on pins 1 and
jumper JU5 (RTIM, 411µs).
3) Verify that a shunt is installed on jumper
(LATCH, autoretry mode).
JU1
5A),
2 of
JU6
_______________________________________________________________________________________
MAX5927 Evaluation Kit
turns each channel on and off depending on the corre-
sponding ON pin command voltage. In this mode, all
channels are turned off if a fault occurs on any channel.
Lastly, the independent mode provides separate control
of each channel. When a fault occurs in this mode of
operation, the MAX5927 only shuts down the affected
channel. Pushbutton switches SW1–SW4 are provided
for resetting the outputs VOUT1–VOUT4, respectively.
The EV kit has configurable startup timer settings.
Jumper-configurable (JU9–JU12) independent power
turn-on delay capacitors at each ON pin input
(C9–C12) provide several choices for evaluating differ-
ent hot-swap methods. The MAX5927’s ON pin signals
and open-drain STAT pin signals are provided at head-
ers J1 and J2 for all channels on the EV kit. The 0.100in
center headers can be connected with a ribbon cable
to facilitate evaluation. The STAT pin’s logic polarity can
be reversed using JU7 to configure the MAX5927 POL
pin. The EV kit also features a configurable
latch/autoretry fault mode. JU6 configures the EV kit for
the desired fault mode. In the latched mode, the out-
puts are latched off until all the power supplies have
been cycled off and then on.
Additionally, the pushbutton switch for the respective
channel that caused the fault can be pushed to unlatch
the outputs. In the autoretry mode, the MAX5927
attempts to turn the outputs back on after a delay period.
The MAX5927 controls each channel’s power n-chan-
nel MOSFET (N1–N4) and provides current regulation
during startup for all four channels’ outputs. The cur-
rent-limit threshold level can be reconfigured separate-
ly for each channel’s output.
The 5V output (VOUT1) current limit can be configured
for 1A by using JU1. PC board pads are provided for
external capacitor C5 to increase MOSFET N1’s gate
turn-on time. Test point TP1 can be used with an oscil-
loscope to view N1’s gate voltage. PC board pads are
also provided for an optional user-installed surface-
mount zener diode (SOD-123 case, D5) to clamp N1’s
gate-source voltage.
Evaluates: MAX5927
The 3.3V output (VOUT2) current limit can be config-
ured for 3A by using JU2. PC board pads are provided
for external capacitor C6 to increase MOSFET N2’s
gate turn-on time. Test point TP2 can be used with an
oscilloscope to view N2’s gate voltage.
The 2.5V output (VOUT3) current limit can be config-
ured for 10A by using JU3. PC board pads are provid-
ed for external capacitor C7 to increase MOSFET N3’s
gate turn-on time. Test point TP3 can be used with an
oscilloscope to view N3’s gate voltage.
The 1.8V output (VOUT4) current limit can be config-
ured for 10A by using JU4. PC board pads are provid-
ed for external capacitor C8 to increase MOSFET N4’s
gate turn-on time. Additionally, pads are also provided
for an optional user-installed surface-mount resistor
(0805 case, R33) to help control gate oscillations on N4
or to disable it. Test point TP4 can be used with an
oscilloscope to view N4’s gate voltage.
Additionally, the MAX5927 EV kit can be used to evalu-
ate outputs up to 20A. When configuring for higher cur-
rent levels, install optional capacitors C18–C21. These
capacitors are provided with the EV kit. Several resis-
tors and MOSFETs must be appropriately chosen for
the higher current levels. See the
Evaluating Other
Input Voltages (1V to 13.2V) and Other Output Currents
section for more details. Diodes D1–D4 on the EV kit
are used to prevent an inductive kickback resulting
from long lead connections in a lab environment. They
are generally not needed in a real application circuit.
The MAX5927 EV kit can also be used to emulate the
MAX5929 quad hot-swap design or the MAX5930/
MAX5931 triple hot-swap design after reconfiguring the
appropriate jumpers and/or component replacement.
See the
MAX5929/MAX5930/MAX5931 Emulation
section
for information on emulating other hot-swap designs.
4
_______________________________________________________________________________________
MAX5927 Evaluation Kit
Jumper Selection
Several jumper selections in the following tables dis-
play the functions and emulation modes provided by
the MAX5927 EV kit.
5V Slow Comparator Current Limit (VOUT1)
The MAX5927 EV kit features a 2-pin jumper (JU1) to
change the slow comparator current-limit threshold
level for the 5V output. Table 1 lists the jumper options.
3.3V Slow Comparator Current Limit (VOUT2)
The MAX5927 EV kit features a 2-pin jumper (JU2) to
change the slow comparator current-limit threshold
level for the 3.3V output. Table 2 lists the jumper
options.
2.5V Slow Comparator Current Limit (VOUT3)
The MAX5927 EV kit features a 2-pin jumper (JU3) to
change the slow comparator current-limit threshold level
for the 2.5V output. Table 3 lists the jumper options.
1.8V Slow Comparator Current Limit (VOUT4)
The MAX5927 EV kit features a 2-pin jumper (JU4) to
change the slow comparator current-limit threshold level
for the 1.8V output. Table 4 lists the jumper options.
Evaluates: MAX5927
Table 1. Jumper JU1 Functions
SHUNT
LOCATION
Installed
None
ILIM1 PIN
Connected to
GND
Connected to
resistor R11
EV KIT MODE
VOUT1 slow comparator
current limit set to 25mV
VOUT1 slow comparator
current limit set to 50mV
Table 3. Jumper JU3 Functions
SHUNT
LOCATION
Installed
None
ILIM3 PIN
Connected to
GND
Connected to
resistor R13
EV KIT MODE
VOUT3 slow comparator
current limit set to 25mV
VOUT3 slow comparator
current limit set to 50mV
Table 2. Jumper JU2 Functions
SHUNT
LOCATION
Installed
None
ILIM2 PIN
Connected to
GND
Connected to
resistor R12
EV KIT MODE
VOUT2 slow comparator
current limit set to 25mV
VOUT2 slow comparator
current limit set to 39mV
Table 4. Jumper JU4 Functions
SHUNT
LOCATION
Installed
None
ILIM4 PIN
Connected to
GND
Connected to
resistor R14
EV KIT MODE
VOUT4 slow comparator
current limit set to 25mV
VOUT4 slow comparator
current limit set to 50mV
_______________________________________________________________________________________
5
京公网安备 11010802033920号
Copyright © 2005-2026 EEWORLD.com.cn, Inc. All rights reserved
电子工程世界
