MAX15003EVKIT+ Maxim Integrated Products, MAX15003EVKIT+ Datasheet - Page 4

• Manufacturer Part Number: MAX15003EVKIT+
• Description: Power Management Modules & Development Tools KIT EVAL FOR MAX15003
• Manufacturer: Maxim Integrated Products

Specifications of MAX15003EVKIT+

• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

The MAX15003 EV kit is configured for normal operation
with an input power source of 6V to 14V. However, the
upper input-voltage limit can be raised to 23V by replac-
ing capacitors C1, C2, C8, and C14 with higher voltage-
rated capacitors. The EV kit circuit requires a minimum
5.5V input to generate the 5V regulation voltage (REG)
used to power the MOSFET gate drivers and provide
the pullup voltage for the SEL and PHASE inputs.
The MAX15003 EV kit’s three outputs are configured to
different voltages. VOUT1 is configured to 3.3V, with
resistors R16 and R17, and can supply up to 3A.
VOUT2 is configured to 2.5V, with resistors R4 and R5,
and can supply up to 4A. VOUT3 is configured to 1.2V,
with resistors R28 and R29, and can supply up to 10A.
The output voltage for each output can be reconfigured
between 0.6V and 0.9V x IN by replacing the respective
feedback resistors. Refer to the Type III: Compensation
when f
data sheet for instructions on selecting new resistor val-
ues for the respective outputs. Also refer to the Inductor
Selection, Input Capacitor Selection , and the
Compensation Design Guidelines sections in the IC
data sheet to verify whether other components need
replacement for proper operation after reconfiguring
the output voltage.
The current limit for each MAX15003 EV kit output is set
with resistors. VOUT1 current limit is set to a nominal
4.5A, at room temperature, with resistors R44 and R23.
VOUT2 current limit is set to a nominal 6A, at room tem-
perature, with resistors R42 and R11. VOUT3 current
limit is set to a nominal 15A, at room temperature, with
resistors R43 and R35. To reconfigure the current limits,
refer to the Setting the Current Limit section in the
MAX15003 IC data sheet to calculate new resistor val-
ues for R44/R23, R42/R11, and R43/R35.
MAX15003 Evaluation Kit
Table 1. Current-Limit Resistor Configuration
4
VOUT_ OUTPUT
_______________________________________________________________________________________
VOUT1
VOUT2
VOUT3
CO
< f
ZERO, ESR
ILIM_ RESISTORS
R44, R23
R42, R11
R43, R35
section in the MAX15003 IC
Triple Outputs
OPEN RESISTOR
Current Limit
Input Source
R20
R19
R32
R31
R8
R7
0Ω RESISTOR
The MAX15003 IC limits the inductor current by sensing
the voltage drop across the respective MOSFET’s
low-side on-resistance (R
equivalent low-side sense resistance for each output
can be changed by cutting open the PCB shorting trace
across R9, R21, and R33 and installing sense resistors.
Alternatively, the low-side MOSFET’s R
eliminated from the equivalent low-side sense resis-
tance, at each buck converter, by cutting open the PCB
shorting trace across R19, R7, or R31, and installing a
shorting resistor at R20, R31, or R32, respectively. See
Table 1 for current-limit resistor configuration.
The MAX15003 PWM switching frequency is set to
600kHz with resistor R40 (165kΩ). Replace resistor R40
with a new resistor value to progam the switching
frequency between 200kHz and 2.2MHz. Use the fol-
lowing equation to choose the appropriate resistor
value to reconfigure the switching frequency (f
The switching frequency can also be synchronized to
an external digital clock signal connected to the EV kit
SYNC PCB pad. For proper synchronization, the exter-
nal signal frequency must be at least 20% higher than
3x the frequency programmed through resistor R40.
The digital clock signal should have peak amplitude of
3V to 5V, offset voltage of 1/2 the amplitude, frequency
in the 600kHz to 6.9MHz range, and a duty cycle of
50%. The MAX15003 IC switching frequency will be 1/3
the SYNC frequency. Refer to the Inductor Selection,
Input Capacitor Selection , and the Compensation
Design Guidelines sections in the MAX15003 IC data
sheet to verify whether other components need
replacement for proper operation after reconfiguring
the switching frequency.
R19
R20
R31
R32
R7
R8
f
SW
INDUCTOR CURRENT-SENSING ELEMENTS
(Hz) = 10
11
DS(ON)
/(R40 + 1750) (Ω)
Switching Frequency
N4-A + R21
N1-B + R9
N3 + R33
R21
R33
R9
) at each output. The
DS(ON)
SW
can be
):