Evaluates: MAX17509 4.5V–16V,
Dual 3A Synchronous Buck Converter
MAX17509 Evaluation Kit
General Description
The MAX17509 evaluation kit (EV kit) is a fully assembled
and tested circuit board to demonstrate the performance
of the MAX17509, a dual 3A, high-efficiency, synchronous
step-down DC-DC converter. The EV kit operates from a
4.5V to 16V input voltage to generate two, independent
3.3V and 1.2V outputs, with each regulator delivering
up to 3A continuous output current. The EV kit is preset
to the default 1MHz switching frequency for optimum
efficiency and component sizes, and each regulator
operates 180° out-of-phase to reduce input-voltage ripple
and total RMS input ripple current. The EV kit also
features adjustable input undervoltage-lockout (UVLO),
programmable frequency, external frequency synchro-
nization input, adjustable output voltage ranging from
0.904V to 3.782V and 4.756V to 5.048V with 20mV
resolution, selectable switching slew rate, adjustable soft-
start time with soft-stop option, power-good outputs, and
selectable overcurrent (OC) fault response to promote
design flexibility and system reliability.
Features
●
Wide Input-Voltage Range (4.5V to 16V)
●
3.3V and 1.2V Output Voltages
●
Up to 3A Output Current per Regulator
●
Two Independent Outputs Operating 180° Out-of-
Phase
●
1MHz Switching Frequency
●
External Frequency Synchronization Input
●
Brickwall and Latchoff Overcurrent Response
(Selectable to Hiccup Response)
●
Autoconfigured Internal Compensation
●
Power-Good Output Indicator
●
Independent Adjustable EN/UVLO Input
●
Independent Adjustable Soft-Start Time with Soft-
Stop Option
●
Selectable Switching Slew Rate for EMC Compliant
●
Low-Profile and Small-Size, Surface-Mount
Components
●
Fully Assembled and Tested
19-7670; Rev 0; 6/15
Ordering Information
appears at end of data sheet.
Quick Start
Recommended Equipment
●
MAX17509 EV kit
●
4.5V to 16V, 4A DC input power supply
●
Two loads capable of sinking 3A
●
Digital voltmeters (DVM)
●
100MHz dual-trace oscilloscope
Procedure
The EV kit is fully assembled and tested. Follow the steps
below to verify board operation.
Caution: Do not turn on
the power supply until all connections are completed.
1) Set the power supply at a voltage between 4.5V and
16V. Disable the power supply.
2) Connect the positive and negative terminals of the
power supply to IN and PGND PCB pads, respectively.
3) Connect the positive and negative terminals of the
first 3A load to OUT1 and PGND PCB pads, respec
-
tively, and the second 3A load to OUT2 and PGND
PCB pads, respectively. Set both loads to 0A.
4)
Connect the first DVM across the OUT1 and PGND
PCB pads, and the second across OUT2 and PGND,
respectively.
5) Change the position of SW1 and SW2 to position 1-2
(or 2-3) to enable the respective regulator. SW1 and
SW2 in the middle position will disable the device.
6) Enable the input power supply.
7) Verify that DVM1 displays 3.3V and DVM2 displays
1.2V.
8) Increase the load up to 3A to verify that DVM
continues displaying 3.3V and 1.2V, respectively.
Note that the EV kit is designed to demonstrate com-
pact solution-size so that the output voltage-sensing
is performed near C2 for VOUT1 and C3 for VOUT2.
Therefore, the output voltage is accurate across
those respective components.
