MAX8555AEVKIT Maxim Integrated Products, MAX8555AEVKIT Datasheet - Page 2

• Manufacturer Part Number: MAX8555AEVKIT
• Description: EVAL KIT FOR MAX8555
• Manufacturer: Maxim Integrated Products

Specifications of MAX8555AEVKIT

• Main Purpose: Power Management, ORing Controller / Load Share
• Utilized Ic / Part: MAX8555A
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Secondary Attributes: -
• Embedded: -
• Primary Attributes: -

Note: Please indicate that you are using the MAX8555A when contacting these component suppliers.
The MAX8555A EV kit is a fully assembled and tested
surface-mount board. Follow the steps below for simple
board operation. Do not turn on the power supplies
until all connections are completed:
1) Verify that a shunt is connected across jumpers JU1
2) Connect the positive terminal of a 10V power supply
3) Connect the positive terminal of a 1.5V power sup-
4) Connect the positive terminal of another 1.5V power
5) Connect a voltmeter across the VOUT and GND
6) Connect an oscilloscope to test points TP1 and TP2
7) Connect a voltmeter or an oscilloscope to the
8) Turn on the 10V power supply.
9) Turn on both 1.5V power supplies.
10) Verify that the voltmeter at VOUT measures 1.5V
11) Verify that the fault-out signals FAULT1 and FAULT2
12) The EV kit is ready to interface to a system for fur-
MAX8555A Evaluation Kit
2
Fairchild
Sanyo
Taiyo Yuden
TDK
Vishay
and JU2 (TIMER function set to 250kHz).
to the VDD1 and VDD2 pads. Connect the ground
terminal of this power supply to the GND pads.
ply to the VIN1 banana jack. Connect the ground
terminal of this power supply to the GND banana
jack.
supply to the VIN2 banana jack. Connect the
ground terminal of this power supply to the GND
banana jack.
terminals.
on the EV kit.
FAULT1 and FAULT2 pads to capture the fault
signals. Use oscilloscope probes with 10MΩ
impedance.
and test points TP1 and TP2 measure approximate-
ly 6.5V with respect to ground.
measure approximately 1.5V.
ther testing.
_______________________________________________________________________________________
SUPPLIER
Quick Start
888-522-5372
619-661-6835
800-348-2496
847-803-6100
203-268-6261
PHONE
The MAX8555A EV kit implements two identical, parallel
circuits that demonstrate the functionality of the
MAX8555A ORing MOSFET controller, which provides
redundancy and fault isolation in highly reliable power
systems. The EV kit is configured to operate in 1.5V bus
systems; however, the EV kit can be modified to oper-
ate in 0.5V to 3.3V power systems. The EV kit can han-
dle up to 20A of throughput current.
During startup, both EV kit circuits monitor the voltage
difference between the input power supplies connected
to VIN1 or VIN2 and the power bus VOUT. Once the
voltage difference is less than the internal threshold of
0.05V (typ), and the input power-supply voltage at VIN1
or VIN2 is greater than the undervoltage threshold, the
respective MAX8555A controller turns on the associat-
ed MOSFETs in the circuit. Turning on these MOSFETs,
connects the input power supplies to the system bus
without disturbing the system voltage. The EV kit then
continuously monitors the supply current and voltages
to protect against undervoltage, overvoltage, and
reverse-current fault conditions. The MAX8555A con-
troller uses the MOSFETs R
forward and reverse-current conditions. At undervolt-
age, overvoltage, or reverse-current fault conditions, a
logic-low signal is asserted on the fault outputs
(FAULT1 or FAULT2). The MOSFETs are turned off to
isolate the inputs (VIN1 or VIN2) from VOUT.
The OVP and the UVP thresholds are adjustable and
can be disabled. The UVP threshold is set to 0.75V and
the OVP threshold is set to 2V.
The MAX8555A EV kit requires one voltage source
capable of providing 8V to 13.25V to the VDD1 and
VDD2 pads to power the two MAX8555A MOSFET con-
trollers (U1 and U2, respectively). The input voltage
requirement at VDD1 and VDD2 can be lowered to 3V
to 5.5V by installing 0Ω resistors at R8 and R16. The EV
619-661-1055
847-925-0899
847-390-4405
203-452-5670
FAX
—
Component Suppliers
Detailed Description
Input Voltage Sources
DS(ON)
www.fairchildsemi.com
www.sanyo.com
www.t-yuden.com
www.component.tdk.com
www.vishay.com
resistance to monitor
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