Datasheet

MAX16962R Evaluation Kit
Evaluates: MAX16962R
2Maxim Integrated
Quick Start
Required Equipment
• MAX16962R EV kit
• 5.5V adjustable, 5A power supply
• Electronic load capable of sinking up to 4A
• Two digital voltmeters
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) Verify that shunts are installed on jumpers JU1
(output enabled) and JU2 (forced-PWM mode).
2) Connect the power-supply positive and ground
terminals to the VSUP and PGND banana jacks,
respectively.
3) Connect the positive and negative terminal of the
electronic load to the VOUT and PGND banana
jacks, respectively.
4) Connect a voltmeter across the VOUT and PGND
PCB pads.
5) Connect a voltmeter across the PG1 and GND PCB
pads.
6) Turn on the power supply.
7) Set the power-supply voltage to 5V.
8) Enable the electronic load and set it to 4A
9) Verify that the voltmeter connected to VOUT
measures approximately 3.3V.
10) Verify that the voltmeter connected to PG1 measures
approximately 5V.
Detailed Description of Hardware
The MAX16962R EV kit is a fully assembled and tested
circuit board that contains all the components neces-
sary to evaluate the performance of the MAX16962R
high-efficiency, synchronous PWM step-down converter
with integrated high-side and low-side switches. The IC
is available in a 16-pin TQFN package and features an
exposed pad for thermal dissipation.
The EV kit circuit uses a step-down converter IC to imple-
ment a step-down synchronous DC-DC converter circuit
with a fixed 2.2MHz switching frequency. The EV kit
output is configured to 3.3V and delivers up to 4A output
current. The IC’s on-board low R
DSON
switches help
minimize efficiency losses at heavy loads and reduce
critical/parasitic inductances, resulting in a very small
compact layout. The EV kit circuit is designed to operate
from a single DC power supply that provides 3.5V to 5.5V
and up to 4A of current.
The EV kit converter circuit is configured to 3.3V using
resistors R6 and R7. The EV kit can be configured to
operate in forced fixed-frequency PWM mode or low-
quiescent current skip mode using jumper JU2. Ferrite
bead L2 and capacitor C9 are available for prevent-
ing oscillation at the circuit input when interfacing long
cables from the power supply to the EV kit’s VSUP and
PGND PCB pads.
The circuit includes a SYNC PCB pad that can be used
to synchronize the IC to frequencies operating in the
1.7MHz to 2.5MHz range. The EV kit also provides a PG1
PCB pad for monitoring the power-good output and a
PWM PCB pad for driving the PWM input.
Configuring the Output Voltage (V
OUT
)
The EV kit converter is configured to 3.3V using resistors
R6 and R7. The EV kit’s output voltage (V
OUT
) can be
reconfigured in the range of 0.8V to 3.6V by replacing
resistors R6 and R7. Use the following equation to recon-
figure the output voltage to the desired value:
OUT
V
R7 R6 1
0.8

=×−


where V
OUT
is the desired output voltage in volts and R6
is typically less than 100kI.
The external feedback resistive divider must be frequen-
cy compensated for proper operation. Place a capacitor
across each resistor in the resistive-divider network.
Use the following equation to determine the value of the
capacitors:
R6
C8 C7 , where C7 100pF
R7

= =

