- -
50
◆
Adjustable Output Voltage Range From 0.7 V to VI
◆
Fixed Output Voltage Options Available
◆
Up to 300 mA Output Current
◆
1 MHz Fixed Frequency PWM Operation
◆
Highest Efficiency Over Wide Load Current Range Due to Power Save Mode
◆
15-µA Typical Quiescent Current
◆
Soft Start
◆
100% Duty Cycle Low-Dropout Operation
◆
Dynamic Output-Voltage Positioning
◆
Available in a Tiny 5-Pin SOT23 Package
3. PIN Description
PIN No.
Symbol
I/O
Description
1
VI
I
Supply voltage pin
2
GND
Ground
3
EN
I
The enable pin of the device
4
FB
I
The feedback pin of the device
5
SW
I/O
The switch pin
3.5.5 Function introduction to MCP73832
1. Description
The MCP73831/2 devices are highly advanced linear charge management controllers for use in
space-limited, cost-sensitive applications. The MCP73831/2 are available in an 8-Lead, 2 mm x 3 mm
DFN package or a 5-Lead, SOT23 package. Along with their small physical size, the low number of
external components required make the MCP73831/2 ideally suited for portable applications. For
applications charging from a USB port, the MCP73831/2 adhere to all the specifications governing the
USB power bus.
The MCP73831/2 employ a constant-current/constantvoltage charge algorithm with selectable
preconditioning and charge termination. The constant voltage regulation is fixed with four available options:
4.20V, 4.35V, 4.40V or 4.50V, to accommodate new, emerging battery charging requirements. The
constant current value is set with one external resistor. The MCP73831/2 devices limit the charge current
based on die temperature during high power or high ambient conditions. This thermal regulation optimizes
the charge cycle time while maintaining device reliability.
2. Features