MCP1640/B/C/D
6.0
TYPICAL APPLICATION CIRCUITS
L1
4.7 µH
VOUT
MANGANESE LITHIUM
DIOXIDE BUTTON CELL
5.0V @ 5 mA
SW
V
OUT
V
IN
976 K
+
COUT
10 µF
CIN
2.0V TO 3.2V
V
4.7 µF
FB
EN
-
309 K
®
GND
FROM PIC MCU I/O
Note:
For applications that can operate directly from the battery input voltage during Sleep mode and
require a higher voltage during normal run mode, the MCP1640C device provides input to output
bypass when disabled. The PIC Microcontroller is powered by the output of the MCP1640C. One
of its I/O pins is used to enable and disable the MCP1640C to control its bias voltage. While
operating in Sleep mode, the MCP1640C input quiescent current is typically less than 1 uA.
FIGURE 6-1:
Manganese Lithium Coin Cell Application using Bypass Mode.
L1
10 µH
VOUT
VIN
5.0V @ 350 mA
SW
V
3.3V To 4.2V
OUTS
V
IN
V
OUTP
976 K
COUT
10 µF
CIN
10 µF
+
V
FB
EN
309 K
P
S
-
GND
GND
FIGURE 6-2:
USB On-The-Go Powered by Li-Ion.
2010 Microchip Technology Inc.
DS22234A-page 19
MICROCHIP [ MICROCHIP ]
