Datasheet

 2010 Microchip Technology Inc. DS22234A-page 19
MCP1640/B/C/D
6.0 TYPICAL APPLICATION CIRCUITS
FIGURE 6-1: Manganese Lithium Coin Cell Application using Bypass Mode.
FIGURE 6-2: USB On-The-Go Powered by Li-Ion.
V
IN
GND
V
FB
SW
V
OUT
5.0V @ 5 mA
C
OUT
10 µF
C
IN
4.7 µF
L
1
4.7 µH
V
OUT
976 K
309 K
EN
MANGANESE LITHIUM
DIOXIDE BUTTON CELL
2.0V TO 3.2V
+
-
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.
V
IN
P
GND
V
FB
SW
V
IN
3.3V To 4.2V
V
OUT
5.0V @ 350 mA
C
OUT
10 µF
C
IN
10 µF
L
1
10 µH
V
OUTS
+
-
976 K
309 K
V
OUTP
S
GND
LI-ION
EN