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MCP16251 Datasheet(PDF) 19 Page - Microchip Technology

Part # MCP16251
Description  Low Quiescent Current, PFM/PWM Synchronous Boost Regulator with True Output Disconnect or Input/Output Bypass Option
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Manufacturer  MICROCHIP [Microchip Technology]
Direct Link  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

MCP16251 Datasheet(HTML) 19 Page - Microchip Technology

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 2013 - 2016 Microchip Technology Inc.
DS20005173B-page 19
MCP16251/2
6.0
TYPICAL APPLICATION CIRCUITS
FIGURE 6-1:
Manganese Lithium Coin Cell Application using I/O Bypass Mode.
FIGURE 6-2:
MCP16251 with an External ULVO Circuit.
VIN
GND
VFB
SW
VOUT
5.0V @ 5 mA
COUT
10 µF
CIN
4.7 µF
L1
4.7 µH
VOUT
3.09 M
1M
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 Standby mode
and require a higher voltage during Normal Run mode, the MCP16252 device provides
input-to-output bypass, when disabled. Here, the PIC® microcontroller is powered by the output
of the MCP16252. One of the microcontroller’s I/O pins is used to enable and disable the
MCP16252, and to control its bias voltage. While in Shutdown mode, the MCP16252 input
current is typically 0.6 µA.
MCP16252
VIN
GND
VFB
SW
VOUT
3.3V
COUT
10 µF
CIN
4.7 µF
L
4.7 µH
VOUT
1.69 M
1M
EN
RTOP
RBOT
Q1
MMBT2907
2M
2.2 M
R2
R3
2.4 M
R1
Q2
MMBT2222
3.09 M
R4
+
-
1M
R5
Note:
This is a simple low IQ one-cell boost converter
with an external ULVO circuit. The EN pin is kept
high as long as the battery voltage is higher than
0.8V. The converter will not (re)start if the battery
voltage is lower than 1.1V and will stop working
(EN goes low level) if battery voltage drops
below 0.8V.
The
external
ULVO
circuit
consumes
approximately 0.5 µA from a discharged battery
and max. 2 µA from a fresh battery.
ULVO
START
0.4
R
1
R
2
R
3
++

R
1
---------------------------------------
=
ULVO
STOP
0.4
R
1
R
2
+

R
1
-------------------------
=
MCP16251
VIN
EN


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