MCP73837_15 Datasheet, PDF (1/36 Pages) Microchip Technology – Advanced Stand-Alone Li-Ion/Li-Polymer Battery Charge Management Controller with Autonomous AC Adapter or USB Port Source Selection

MCP73837/8
Advanced Stand-Alone Li-Ion/Li-Polymer Battery Charge
Management Controller with Autonomous AC Adapter or
USB Port Source Selection
Features
• Highly Accurate Preset Voltage Regulation:
±0.5%
• Available Voltage Regulation Options:
- 4.20V, 4.35V, 4.4V or 4.5V
• Complete Linear Charge Management Controller:
- Autonomous Power Source Selection
- Integrated Pass Transistors
- Integrated Current Sense
- Integrated Reverse Discharge Protection
• Constant Current (CC)/Constant Voltage (CV)
Operation with Thermal Regulation
• Selectable USB Port Charge Current:
- Low: 1 Unit Load
- High: 5 Unit Loads
• Programmable AC Adapter Charge Current:
- 15 mA – 1000 mA
• Two-Charge Status Outputs
• Power-Good Monitor: MCP73837
• Timer Enable: MCP73838
• Automatic Recharge:
- Selectable Voltage Threshold
• Automatic End-of-Charge Control:
- Selectable Charge Termination Current Ratio
- Selectable Safety Timer Period
• Preconditioning of Deeply Depleted Cells – Can
Be Disabled
• Battery Cell Temperature Monitor
• UVLO (Undervoltage Lockout)
• Automatic Power-Down When Input Power Is
Removed
• Low-Dropout (LDO) Linear Regulator Mode
• Numerous Selectable Options Available for a
Variety of Applications:
- Refer to Section 1.0 “Electrical Characteris-
tics” for Selectable Options
- Refer to the “Product Identification System”
for Standard Options
• Temperature Range: -40°C to 85°C
• Packaging:
- 10-Lead 3 mm x 3 mm DFN
- 10-Lead MSOP*
* Consult the factory for MSOP availability.
Applications
• Smart Phones and Personal Data Assistants
(PDA)
• Portable Media Players (PMP)
• Ultra Mobile Devices (UMD)
• Digital Cameras
• MP3 Players
• Bluetooth Headsets
• Handheld Medical Devices
• AC/USB Dual Source Li-Ion Battery Chargers
Description
The MCP73837 and MCP73838 devices are fully
integrated linear Li-Ion/Li-Polymer battery chargers
with autonomous power source selection. Along with its
small physical size, the low number of external
components required makes the MCP73837/8 ideally
suitable for portable applications.
The MCP73837/8 automatically selects the USB port or
AC adapter as the power source for the system. For the
USB port powered systems, the MCP73837/8
specifically adheres to the current limits governed by
the USB specification. The host microcontroller can
select from two preset maximum charge current rates
of 100 mA (low-power USB port) or 500 mA
(high-power USB port). With an AC adapter providing
power to the system, an external resistor sets the mag-
nitude of the system or charge current up to a
maximum of 1A.
The MCP73837/8 employs a constant current/constant
voltage 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 the new
emerging battery charging requirements. The
MCP73837/8 limits the charge current, based on die
temperature, during high power or high ambient
conditions. This thermal regulation optimizes the
charge cycle time while maintaining the reliability of the
device .
The MCP73837/8 are fully specified over the ambient
temperature range of -40°C to +85°C.
The MCP73837/8 devices are available in either a
3 mm x 3 mm 10-lead DFN package or a 10-lead
MSOP package.
 2007-2015 Microchip Technology Inc.
DS20002071C-page 1