MCP73811 Datasheet, PDF (1/22 Pages) Microchip Technology – Simple, Miniature Single-Cell, Fully Integrated Li-Ion / Li-Polymer Charge Management Controllers

MCP73811/2
Simple, Miniature Single-Cell, Fully Integrated
Li-Ion / Li-Polymer Charge Management Controllers
Features
• Complete Linear Charge Management Controller
- Integrated Pass Transistor
- Integrated Current Sense
- Integrated Reverse Discharge Protection
• Constant Current / Constant Voltage Operation
with Thermal Regulation
• High Accuracy Preset Voltage Regulation: + 1%
• Voltage Regulation: 4.20V
• Selectable Charge Current:
- MCP73811: 85 mA / 450 mA
• Programmable Charge Current:
- MCP73812: 50 mA - 500 mA
• Minimum External Components Required:
- MCP73811: 2 Ceramic Capacitors
- MCP73812: 2 Ceramic Capacitors and
1 Resistor
• No Preconditioning
• No End-of-Charge Control
• No Undervoltage Lockout (UVLO)
• Automatic Power-Down when Input Power
Removed
• Active High Charge Enable
• Temperature Range:
- -40°C to +85°C
• Packaging:
- 5-Lead SOT-23
Applications
• Low-Cost Lithium-Ion/Lithium-Polymer Battery
Chargers
• Rechargeable Toys
• Electronic Cigarettes
• Bluetooth Headsets
• USB Chargers
Description
The MCP73811/2 devices are linear charge manage-
ment controllers that are designed for use in space
limited and cost sensitive applications. The
MCP73811/2 provide specific charge algorithms for
single cell Li-Ion or Li-Polymer battery to achieve
optimal capacity in the shortest charging time possible.
Along with its small physical size, the low number of
external components required make the MCP73811/2
ideally suited for portable applications. For applications
charging from a USB port, the MCP73811 adheres to
all the specifications governing the USB power bus.
The MCP73811/2 employ a constant current/constant
voltage charge algorithm. The constant voltage regula-
tion is fixed at 4.20V, with a tight regulation tolerance of
1%. For the MCP73811, the constant current value is
selected as 85 mA (low power USB port) or 450 mA
(high power USB port) with a digital input signal on the
PROG input. For the MCP73812, the constant current
value is set with one external resistor. The
MCP73811/2 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.
The MCP73811/2 are fully specified over the ambient
temperature range of -40°C to +85°C. The
MCP73811/2 are available in a 5-Lead, SOT-23
package.
Package Types
5-Pin SOT-23
CE 1
V_SS 2
V_BAT ³
5 PROG
4 _VDD
© 2007 Microchip Technology Inc.
DS22036A-page 1