MCP1642B/D High-Current Synchronous Boost Converter Evaluation Board User’s Guide
DS50002353A-page 14
2015 Microchip Technology Inc.
2.1.1
Battery Considerations
When considering a power solution for a design the battery needs to be carefully
selected. Alkaline batteries are a commonly available option that delivers good perfor-
mance in a variety of applications. Energizer
®
Ultimate Lithium batteries are an alter-
native power solution that provides superior performance high drains and allows
designers to utilize the full power range of the MCP1642B/D without sacrificing size or
runtime.
Energizer Ultimate Lithium batteries utilize a primary cell chemistry that contains higher
energy than alkaline batteries and has much better high-drain performance. Ultimate
Lithium batteries produce a high, flat voltage profile that enables them to provide a high
energy capacity even at high drains. Additionally, Ultimate Lithium batteries have a very
low internal resistance, allowing them to maintain a high voltage at very high loads.
2.1.2
MCP1642B/D High-Current Synchronous Boost Converter
Evaluation Board Features
The MCP1642B/D High-Current Synchronous Boost Converter Evaluation Board has
the following features:
• Start-up voltage: 0.65V at V
OUT
= 3.3V and I
OUT
= 1mA, resistive load
• Input voltage range after start-up, V
IN
: 0.35V up to V
OUT
– 200-300 mV
recommended headroom
• Adjustable output voltage range: 1.8V to 5.5V, set by a resistor divider on board
(bottom application using MCP1642B-ADJ)
• Fixed 3.3V output voltage (using the fixed output voltage MCP1642D-33)
• Output current: typical 200 mA @ 3.3V Output, 1.2V Input or 800 mA @ 5.0V
Output, 3V Input
• Output Disconnect (MCP1642B)
• Input-Output Bypass (MCP1642D)
• PWM Operation
• PWM Switching Frequency = 1 MHz
• Enable state, Power Good, Switch test points on board
• Peak Input Current Limit of 1.8A
• Overtemperature protection (if the die temperature e150°C, +35°C
hysteresis)
