Datasheet

MCP1640 Single Quadruple-A Battery Boost Converter Reference Design
DS51922B-page 12  2010-2011 Microchip Technology Inc.
2.1.2 MCP1640 Single Quadruple-A Battery Boost Converter
Reference Design Features
The MCP1640 Single Quadruple-A Battery Boost Converter Reference Design is
developed to demonstrate how the MCP1640 device with True Output Disconnect
Shutdown option is working attached to a microcontroller application. The board
demonstrates how to optimize battery life using the MCP1640 and an 8-bit low-cost
PIC
®
microcontroller, to reduce the No Load Input Current for applications that operate
in Standby mode for a longer period of time.
FIGURE 2-1: MCP1640 Single Quadruple-A Battery Boost Converter
Reference Design Block Diagram.
The MCP1640 Single Quadruple-A Battery Boost Converter Reference Design has the
following features:
• Input voltage: one AAAA Alkaline battery
• Output voltage: 3.3V
• Output current: < 130 mA
• Up to 75% efficiency
• Standby battery current: 14.5 µA @ 1.5V input
• Start-up voltage: 0.65V at V
IN
= 1.2V, V
OUT
= 3.3V and I
OUT
= 1 mA, resistive
load
• Automatic PFM/PWM operation
• PWM Switching Frequency = 500 kHz
• ON/OFF switch button, with approximately 25 seconds ON
• LED status indication (Output ON and Low Battery)
•Energizer
®
Battery Holder with reverse battery protection
MCP1640
12
S1
LED
Status
ON/OFF
I/O
I/O
I/O
V
DD
A/D
Single Quadruple-A Battery Input
V
IN
V
OUT
EN
Load
Load Switch
P-MOS
I/O
PIC12F617