ARD00386 Microchip Technology, ARD00386 Datasheet - Page 16

• Manufacturer Part Number: ARD00386
• Description: Power Management Modules MCP1640 12V 50mA Boost Converter
• Manufacturer: Microchip Technology

Specifications of ARD00386

• Product: DC-DC Converters / Regulators
• Input Voltage Max: 5 V
• Switching Frequency: 500 kHz
• Output Voltage: 12 V
• Output Current: 50 mA
• Input Voltage Min: 2 V

MCP1640 12V/50 mA Two Cells Input Boost Converter Reference Design
DS51999A-page 16
The board has several test points that help engineers analyze the switch node’s
waveforms or MCP1640’s output:
• The high-voltage switch node test point (SWH).
• The test point of the MCP1640 device’s switch node (SWL).
• VO test point shows the MCP1640 device’s V
The difference between SWH and SWL signals is their amplitude. For 12V output, the
amplitude of SWL is approximately 5V, while SWH shows the sum of MCP1640's SW
node (SWL signal) and external n-channel MOS voltage.
Figures
mode waveforms (60 mA load at 2.4V V
the maximum input peak current limit of the MCP1640 device, 800 mA). Once the
800 mA limit is reached, V
value of the inductor current (I
(except the current consumption of MCP1640).
FIGURE 2-4:
Reference Design Test Points (SWH, SWL), Inductor (I_L) and Load Current (I_OUT)
Waveforms for 25 mA Load and 2.4V Input in Discontinuous Mode.
2-4
and
2-5
show the Discontinuous (25 mA load for 2.4V V
MCP1640 12V/50 mA Two Cells Input Boost Converter
OUT
L
value is decreasing (goes out of regulation). The mean
) is equal for a boost converter with the input current
IN
, where the inductor peak current is close to
OUT
pin (this output is unregulated).
© 2011 Microchip Technology Inc.
IN
) and Continuous