MAX16903EVKIT+ Maxim Integrated Products, MAX16903EVKIT+ Datasheet - Page 2

• Manufacturer Part Number: MAX16903EVKIT+
• Description: Power Management Modules & Development Tools MAX16903 EVAL KIT MAX16903 EVAL KIT
• Manufacturer: Maxim Integrated Products

Specifications of MAX16903EVKIT+

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

MAX16903 Evaluation Kit
• MAX16903 EV kit
• +12V, 1A DC power supply (PS1)
• Electronic load or equivalent resistor load
• Two digital multimeters (DMMs)
The EV kit is fully assembled and tested. Follow the steps
below to verify board operation:
1) Verify that the jumpers are in their default position, as
2) Connect the positive terminal of the +12V supply to
3) Set DMM1 to measure voltage and connect the
4) Set the power supply to 1A current limit. Turn on the
5) With jumper JU3 shorted, the green LED should light
1) Set DMM2 to measure current and connect the
2) Set the electronic load to 500mA or use an equivalent
3) Turn on the power supply and electronic load. DMM2
4) Increase the load to 1A and observe the output.
Table 1. Jumper Descriptions (JU1, JU2, JU3)
*Default position.
2
JUMPER
shown in Table 1.
VSUP (TP3) and the negative terminal to PGND (TP2).
positive terminal to VOUT (TP4). Connect the negative
terminal to PGND (TP11).
power supply.
up. DMM1 should display an output voltage of +5V.
positive terminal to VOUT (TP4). Connect the negative
terminal to an electronic load.
resistor load. The resistor load is calculated based
on +5V output and should be approximately 10I. If
using a resistor load, make sure it can handle 5W.
gives the load current while DMM1 gives the output
voltage.
______________________________________________________________________________________
JU1
JU2
JU3
POSITION
SHUNT
Open
Open
1-2*
1-2*
1-2*
2-3
2-3
Connects EN to VSUP (normal operation).
Connects EN to PGND (shutdown).
Connects SYNC to VBIAS to enable forced-PWM mode.
Connects SYNC to AGND to enable skip mode under light-load conditions.
When SYNC is unconnected or when a clock source is present, forced-PWM mode is enabled.
SYNC can be used to synchronize with other supplies when a clock source is present.
Powers the green LED from the VBIAS supply.
Does not power the green LED from the VBIAS supply.
Required Equipment
Additional Evaluation
Quick Start
Procedure
The MAX16903 EV kit provides a proven layout for the
MAX16903 2.1MHz synchronous buck regulator. The
device accepts input voltages as high as +28V and
delivers up to 1A at +5V. The EV kit can handle an input-
supply transient up to +42V. Various test points are
included for evaluation.
The device can operate in two modes, forced PWM or
skip mode. For light-load conditions, skip mode has
better efficiency. When SYNC is pulled low, the device
operates in skip mode for light loads and PWM mode
for larger loads. By applying a high level on SYNC,
the device is forced to do PWM even under light-load
conditions.
SYNC can also be used to synchronize with other
supplies if a clock source is present. The device forces
PWM when a clock source is present based on the input
clock.
The device is available in fixed +5V and +3.3V outputs.
The EV kit comes installed with the +5V output version.
The +3.3V output part can be swapped with the +5V part
on the EV kit and the device functions without changing
other components. To optimize efficiency, refer to the
MAX16903 IC data sheet.
Detailed Description of Hardware
DESCRIPTION
Evaluating the +3.3V Version
SYNC