ADM00427 Microchip Technology, ADM00427 Datasheet - Page 12

• Manufacturer Part Number: ADM00427
• Description: Power Management IC Development Tools MCP16323 Evaluation Board
• Manufacturer: Microchip Technology
• Type: DC/DC Converters, Regulators & Controllersr

Specifications of ADM00427

• Rohs: yes
• Product: Evaluation Boards
• Tool Is For Evaluation Of: MCP16323
• Input Voltage: 6 V to 18 V
• Output Voltage: 3 V
• Output Current: 3 A

MCP16323 Evaluation Board User’s Guide
2.2
DS52029A-page 12
GETTING STARTED
A copper via, labeled INJ, connected between the 10Ω injection resistor (R1) and the
R
A copper via, labeled Enable, connected to the enable input on the device can be pop-
ulated and used to turn the MCP16323 on and off. Turning the device on (Enable >
2.2V) when the undervoltage lockout threshold is met (V
device. This pin must be pulled low (Enable < 0.8V) to disable the device.
A copper via, labeled SW, connected to the switch node of the device can be populated
to analyze the switch node of the device.
The MCP16323 Evaluation Board is fully assembled and tested to evaluate and dem-
onstrate the MCP16323 operational capabilities.
2.2.1
2.2.1.1
The MCP16323 Evaluation Board is fully assembled, tested and ready to begin evalu-
ation. Apply positive input voltage to the V
The maximum input voltage should not exceed 18V. An electronic load or resistive load
can be used for evaluation, or the intended system load can be connected. Electronic
loads attempt to sink current at 0V during startup; a resistive load or constant resis-
tance is recommended for startup evaluation. Connect the positive voltage terminal of
the load to the V
ative or return side of the load to the GND terminal.
2.2.1.2
To test the board:
1. Apply greater than 6V to the input for proper operation, no minimum load is
2. The EN input is internally pulled up to a low voltage internal source enabling the
3. The measured output voltage should be 3.0V typical. Adjusting the input voltage
2.2.2
The MCP16323 integrates both high-side and low-side, low resistance N-Channel
MOSFETs. A high-side or floating supply is needed to drive the gate of the high-side
N-Channel MOSFET above the input voltage to turn it on. The evaluation board uses
the output voltage to charge the boost cap while the inductor current flows. Prior to
startup, there is no inductor current, so an internal pre-charge circuit charges the boost
cap up to a minimum threshold. Once charged, the N-Channel can be turned on, ramp-
ing current into the inductor.
The worst case operating conditions for charging the boost capacitor occur at minimum
V
boost cap to a high value. At no load, the converter is operating at a minimum or very
low duty cycle, putting a small amount of current into the inductor. When the switch
turns off, the inductor current decays very quickly, resulting in a short time to recharge
the boost capacitor.
IN
top
and no load. At minimum V
required to regulate the output to 3.0V.
device. To disable the device, the EN input can be pulled below 0.8V.
and load should not cause the output to vary significantly over the operating
range of the converter.
resistor can be populated to allow a convenient injection point for stability analysis.
Power Input and Output Connection
POWERING THE MCP16323 EVALUATION BOARD
BOARD TESTING
How the MCP16323 High-Side Drive Boost Circuit Operates
OUT
terminal on the MCP16323 Evaluation Board and connect the neg-
IN
(6V), there is not enough headroom to pre-charge the
IN
terminal and its return to the GND terminal.
IN
 2011 Microchip Technology Inc.
> 5.75V), will enable the