MCP1640_13 Datasheet, PDF (19/32 Pages) Microchip Technology – 0.65V START-UP SYNCHRONOUS BOOST REGULATOR WITH TRUE OUTPUT DISCONNECT OR INPUT/OUTPUT BYPASS OPTION

MCP1640/B/C/D
6.0 TYPICAL APPLICATION CIRCUITS
L₁
4.7 µH
MANGANESE LITHIUM
DIOXIDE BUTTON CELL
+
2.0V TO 3.2V
-
C_IN
4.7 µF
FROM PIC^® MCU I/O
SW _VOUT
V_IN
EN
V_FB
GND
V_OUT
5.0V @ 5 mA
976 K
309 K
C_OUT
10 µF
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 out-
put 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.
V_IN
3.3V To 4.2V
+
C_IN
10 µF
-
L₁
10 µH
SW _VOUTS
V_{IN VOUTP}
EN
V_FB
P_{GND SGND}
V_OUT
5.0V @ 350 mA
976 K
309 K
C_OUT
10 µF
FIGURE 6-2:
USB On-The-Go Powered by Li-Ion.
 2011 Microchip Technology Inc.
DS22234B-page 19