Datasheet

MCP1640 Single Quadruple-A Battery Boost Converter Reference Design
DS51922B-page 14  2010-2011 Microchip Technology Inc.
FIGURE 2-2: MCP1640 Single Quadruple-A Battery Boost Converter
Reference Design Setup Circuit.
2.2.2 How the MCP1640 Single Quadruple-A Battery Boost Converter
Reference Design is working?
The board is powered from a quadruple-A battery which has 600 mAh typical capacity.
If the battery is inserted in the holder, the application will start running in Standby mode.
In this mode, the PIC12F617 works in Sleep Mode most of the time, consuming a few
µA from the battery. The MCP1640 consumes 0.75 µA typically in Shutdown mode.
When the MCP1640 is in Normal operating mode, the No Load Input Current is approx-
imately 70 µA at 1.5V input. To reduce the average input current of the board, the
MCP1640’s EN input is pulsed at a slow rate. Figure 2-3 shows that this current is
reduced up to 80%.
FIGURE 2-3: The Average Current Consumed from the Battery
in Standby Mode.
Voltmeter
AAAA Battery
+
_
S1: Switch ON/OFF
3.3V OUT
47R/0.5W
3.3V OUT
10
15
20
25
30
0.8 1 1.2 1.4 1.6
Input Voltage (V)
Standby No Load Input
Current (µA)