MAX15023EVKIT+ Maxim Integrated Products, MAX15023EVKIT+ Datasheet - Page 4

• Manufacturer Part Number: MAX15023EVKIT+
• Description: KIT EVALUATION FOR MAX15023 CTLR
• Manufacturer: Maxim Integrated Products

Specifications of MAX15023EVKIT+

• Main Purpose: DC/DC, Step Down
• Outputs And Type: 2, Non-Isolated
• Voltage - Output: 1.2V, 3.3V
• Current - Output: 10A, 5A
• Voltage - Input: 9 ~ 16V
• Regulator Topology: Buck
• Frequency - Switching: 500kHz
• Board Type: Fully Populated
• Utilized Ic / Part: MAX15023
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Power - Output: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

MAX15023 Evaluation Kit
Resistors R14 and R15 set VOUT1 and VOUT2 source
current-limit voltage thresholds (V
110mV, respectively. The sink current-limit voltage
threshold is approximately half the source current-limit
voltage threshold. Use the following equation to recon-
figure the source current-limit voltage threshold:
where V
in volts and R
Refer to the Current-Limit Circuit (LIM_) and Setting the
Cycle-by-Cycle, Low-Side Source Peak Current Limit
sections in the MAX15023 IC data sheet for further
instructions on computing the MAX15023 EV kit source
and sink current limits.
The MAX15023 controller’s switching frequency is set
to 500kHz by resistor R17. Replace resistor R17 with
a new resistor value to program the switching fre-
quency between 200kHz and 1MHz. Use the following
equation to calculate R17 when reconfiguring the
switching frequency:
where f
When reconfiguring the EV kit controller switching fre-
quency, it might be necessary to change compensation
network components to new values. Refer to the
Compensation section in the MAX15023 IC data sheet
for computing new compensation component values.
The MAX15023 EV kit provides power-good output test
points (TP1 and TP2) to monitor the PGOOD1 and
PGOOD2 signals. PGOOD1 and PGOOD2 are high
when VOUT1 and VOUT2, respectively, rise 92.5%
above their programmed output voltages. The PGOOD_
signals are pulled up to VCC by resistors R4 and R5.
When VOUT1 and VOUT2 drop below 89.5% of their
nominal regulated voltages, PGOOD1 and PGOOD2 are
pulled low, respectively.
Jumpers JU1 and JU2 configure the MAX15023 EV kit’s
VOUT1and VOUT2 outputs, respectively, for indepen-
dent turn-on/off control or power-supply sequencing.
Install shunts across pins 1-2 of jumpers JU1 and JU2
to enable VOUT1 and VOUT2 using the MAX15023
4
_______________________________________________________________________________________
SW
ITH_
is in kilohertz and R17 is in kilohms.
is the source current-limit voltage threshold
Enable/Power-Supply Sequencing
ILIM_
R
ILIM
R
is R14 or R15 in ohms.
17
_
( )
=
Ω =
(
f
SW
24806
V
Switching Frequency
50 10
)
Power-Good Outputs
ITH
1 0663
(PGOOD1, PGOOD2)
.
×
_
×
−
10
ITH_
6
) to 80mV and
(JU1, JU2)
VCC linear regulator output or the DC voltage source
supplied at the VCC PCB pad.
The outputs can also be externally controlled, by plac-
ing independent voltage sources greater than 1.3V at
the EN1 and EN2 PCB pads, when shunts are not
installed at jumpers JU1 and JU2. Additional PCB resis-
tor pads R2 and R7 are included to set the individual
channel to a desired turn-on voltage. See Tables 2 and
3 for jumpers JU1 and JU2 settings.
The MAX15023 EV kit outputs can be configured for
power-supply sequencing by utilizing the PGOOD_ out-
puts and configuring jumpers JU1 and JU2 appropri-
ately. Place shunts across pins 1-2 of jumper JU1 and
pins 2-3 of jumper JU2 for power sequencing VOUT1,
and then VOUT2. Place shunts across pins 1-2 of
jumper JU2 and pins 2-3 of jumper JU1 for sequencing
VOUT2, and then VOUT1. See Table 4 for configuring
the outputs for power-supply sequencing operation.
Table 2. JU1 Jumper Selection (EN1)
*See the Power-Supply Sequencing section.
Table 3. JU2 Jumper Selection (EN2)
*See the Power-Supply Sequencing section.
Table 4. Power-Supply Sequencing (JU1,
JU2)
SHUNT POSITION
Not installed
Not installed
POSITION
POSITION
JU1
1-2
2-3
SHUNT
SHUNT
2-3*
2-3*
1-2
1-2
JU2
2-3
1-2
Connected to VCC
Connected to VCC
GND through R8
GND through R3
Pulled down to
Pulled down to
Connected to
Connected to
PGOOD2
PGOOD1
EN1 PIN
EN2 PIN
OUTPUT SEQUENCE OPERATION
Power-Supply Sequencing
VOUT1, VOUT2
VOUT2, VOUT1
supply sequencing)
supply sequencing)
VOUT1 OUTPUT
VOUT2 OUTPUT
Enabled (power-
Enabled (power-
Disabled
Disabled
Enabled
Enabled