19-2819; Rev 0; 4/03
MAX8535 Evaluation Kit
General Description
The MAX8535 evaluation (EV) kit circuit demonstrates
the functionality of the MAX8535 ORing MOSFET con-
troller that provides redundancy and fault isolation to
highly reliable power systems. The MAX8535 EV kit
board operates in 12V systems.
During startup, the EV kit monitors the voltage differ-
ence between a power supply and a power bus. Once
the voltage difference is less than 0.4V, the MAX8535
turns on two ORing MOSFETs, linking the power supply
and power bus. Once the MOSFETs are on, the EV kit
monitors the load current and voltages to protect
against undervoltage (UVP), overvoltage (OVP), and
reverse-current fault conditions.
The OVP and UVP thresholds are adjustable and can
be disabled. The UVP threshold is set to 8V and the
OVP threshold is set to 13.75V. A
FAULT
signal output
is provided for circuit monitoring.
Features
o
Fault Power-Supply Isolation for 12V Bus
o
Eliminates ORing Diode Power Dissipation
o
Reverse-Current Detection
o
Adjustable Undervoltage Threshold
(Configured to 8V)
o
Adjustable Overvoltage Threshold
(Configured to 13.7V)
o
FAULT
Output Status Indicator
o
Adjustable Soft-Start
o
Up to 20A of Load Current
o
Surface-Mount Construction
o
Fully Assembled and Tested
Evaluates: MAX8535
Ordering Information
PART
MAX8535EVKIT
TEMP RANGE
0擄C to +70擄C
IC PACKAGE
8 碌MAX
Component List
DESIGNATION
QTY
DESCRIPTION
0.01碌F
鹵10%,
50V X7R ceramic
capacitor (0603)
TDK C1608X7R1H103K or
Taiyo Yuden UMK107B103KZ
0.1碌F
鹵10%,
50V X7R ceramic
capacitor (0603)
TDK C1608X7R1H104K or
Taiyo Yuden UMK107BJ104KA
1碌F
鹵10%,
16V X7R ceramic
capacitor (0805)
TDK C2012X7R1C105K or
Taiyo Yuden EMK212BJ105KG
Not installed, ceramic capacitors
(1206)
3-pin header
30V, 75A, N-channel MOSFETs
(D
2
-PAK)
Fairchild FDB7045L
DESIGNATION
PS_OUT+,
PS_OUT-,
VBUS+, VBUS-
R1
R2
R3
R4, R6
R5
R7
TP1
U1
None
C4, C5
JU1
N1, N2
0
1
2
None
QTY
4
1
1
1
2
1
1
1
1
1
1
DESCRIPTION
Noninsulated banana jack
connectors
10鈩?/div>
鹵5%
resistor (0805)
51k鈩?/div>
鹵5%
resistor (0805)
53.6k鈩?/div>
鹵1%
resistor (0805)
10k鈩?/div>
鹵1%
resistors (0805)
100k鈩?/div>
鹵1%
resistor (0805)
24.9k鈩?/div>
鹵1%
resistor (0805)
PC test point, red
MAX8535EUA (8-pin 碌MAX)
Shunt (JU1)
MAX8535 PC board
C1
1
C2
1
C3
1
________________________________________________________________
Maxim Integrated Products
1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim鈥檚 website at www.maxim-ic.com.
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