MAX15023EVKIT+ Maxim Integrated Products, MAX15023EVKIT+ Datasheet - Page 3

• 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

The MAX15023 evaluation kit (EV kit) is a fully assem-
bled and tested PCB that contains all the components
necessary to evaluate the performance of the
MAX15023 dual, synchronous step-down controller.
The MAX15023 EV kit is designed to operate from a
single DC power supply that provides 9V to 16V and
5A of current. The MAX15023 controller can also be
operated using a separate 4.5V to 5.5V power source
applied at the VCC and SGND PCB pads. When oper-
ating the MAX15023 EV kit using separate power-
supply sources at the VIN and PGND connectors
and VCC PCB pads, apply power at the VIN and
PGND connectors first and then at the VCC and
SGND PCB pads.
Converter 1 (VOUT1) is configured for 1.2V and pro-
vides up to 10A of output current. VOUT1’s source and
sink current limits are set to 14A (typ) and 7A (typ),
respectively, with resistor R14. Converter 2 (VOUT2) is
configured for 3.3V and provides up to 5A of output cur-
rent. VOUT2’s source and sink current limits are set to
7A (typ) and 3.5A (typ), respectively, with resistor R15.
The switching frequency for both converters is set to
500kHz by resistor R17 and each converter operates
180° out-of-phase to reduce input-voltage ripple and
total RMS input ripple current.
The EV kit includes individual PCB pads for enable
control of each converter and test points to monitor the
converters’ power-good status. Jumpers JU1 and JU2
are also available to configure the outputs for power-
supply sequencing.
The power source is connected to the VIN and PGND
banana jack connectors for the dual converters. The
MAX15023 EV kit converters’ performance is optimized
over the 9V to 16V input-voltage range. The MAX15023
EV kit could operate below the 9V minimum input-volt-
age range and at higher output currents; however, per-
formance might be degraded due to the limitation of
the components used in the EV kit circuit.
The MAX15023 EV kit features an option to select the
bias input for the MAX15023 IC controller when config-
uring the EV kit to operate with an input source less
than 6V. Jumper JU3 selects the input-voltage source
for the MAX15023 IC controller. Place a shunt across
pins 1-2 to power the MAX15023 IC using the power
source applied at the VIN and PGND PCB pads. Place
a shunt across pins 2-3 to power the MAX15023 IC
Detailed Description of Hardware
_______________________________________________________________________________________
Converters’ Input Source
MAX15023 IC Bias Input
MAX15023 Evaluation Kit
input using the power source applied at the VCC and
SGND PCB pads. Note that the power source applied
to the VCC PCB pad has a 4.5V to 5.5V input-voltage
range. When operating the MAX15023 EV kit using a
separate power source at the VCC PCB pad, apply
power to the VIN and PGND connectors PCB pad
first and then the VCC and SGND PCB pads. See
Table 1 for the MAX15023 bias input configuration
VOUT1 and VOUT2 output voltages can be reconfig-
ured between 0.6V to 0.85 x VIN. Resistors R9 and R10
set VOUT1 output voltage and resistors R20 and R21
set VOUT2 output voltage. To configure the EV kit’s out-
put voltages, refer to the Setting the Output Voltage
section in the MAX15023 IC data sheet for instructions
on selecting new resistor values.
Capacitors C5, C6, and C7 and resistors R11 and R13
provide a compensation network for VOUT1 on the
MAX15023 EV kit. Capacitors C9, C10, and C11 and
resistors R18 and R19 provide a compensation network
for VOUT2 on the MAX15023 EV kit.
Refer to the Inductor Selection , Input Capacitor and
Compensation sections in the MAX15023 IC data sheet
to verify whether other components need replacement for
proper operation after reconfiguring the output voltages.
The MAX15023 IC employs a current-sensing algorithm
using the on-resistance of the low-side MOSFET as a
current-sensing element to limit the inductor current.
The inductor current is sensed in each converter by
sensing the voltage drop across the on-resistance
(R
and N4-A). VOUT1 source and sink current limits are
14A (typ) and 7A (typ), respectively. VOUT2 source
and sink current limits are 7A (typ) and 3.5A (typ),
respectively.
Table 1. MAX15023 Bias Input
Configuration
(DSON)
POSITION
SHUNT
1-2
2-3
) of the respective low-side MOSFETs (N2, N3,
Configuring the Output Voltages
Connected to VCC
Connected to VIN
IN PIN
Current-Limit Thresholds
Cycle-by-Cycle Peak
(VOUT1, VOUT2)
MAX15023 IC INPUT
RANGE (V)
4.5 to 5.5
9 to 16
3