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MCP73837 Datasheet

  • MCP73837

  • Advanced Stand-Alone Li-Ion / Li-Polymer Battery Charge Mana...

  • Microchip   Microchip

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MCP73837/8
Advanced Stand-Alone Li-Ion / Li-Polymer Battery Charge
Management Controller with Autonomous AC-Adapter or
USB-Port Source Selection
Features
鈥?High Accuracy Preset Voltage Regulation: + 0.5%
鈥?Available Voltage Regulation Options:
- 4.20V, 4.35V, 4.4V, or 4.5V
鈥?Complete Linear Charge Management Controller:
- Autonomous Power Source Selection
- Integrated Pass Transistors
- Integrated Current Sense
- Integrated Reverse Discharge Protection
鈥?Constant Current (CC) / Constant Voltage (CV)
Operation with Thermal Regulation
鈥?Selectable USB-Port Charge Current:
- Low: 1 Unit Load / High: 5 Unit Loads
鈥?Programmable AC-Adapter Charge Current:
- 15 mA - 1000 mA
鈥?Two Charge Status Outputs
鈥?Power-Good Monitor: MCP73837
鈥?Timer Enable: MCP73838
鈥?Automatic Recharge:
- Selectable Voltage Threshold
鈥?Automatic End-of-Charge Control:
- Selectable Charge Termination Current Ratio
- Selectable Safety Timer Period
鈥?Preconditioning of Deeply Depleted Cells - can be
disabled
鈥?Battery Cell Temperature Monitor
鈥?UVLO (Undervoltage Lockout)
鈥?Automatic Power-Down when Input Power is
Removed
鈥?Low-Dropout (LDO) Linear Regulator Mode
鈥?Numerous Selectable Options Available for a
Variety of Applications:
- Refer to
Section 1.0 鈥淓lectrical
Characteristics鈥?/span>
for Selectable Options鈥?/div>
- Refer to the
鈥淧roduct Identification
System鈥?/span>
for Standard Options
鈥?Temperature Range: -40擄C to 85擄C
鈥?Packaging:
- 10-Lead 3 mm x 3 mm DFN
- 10-Lead MSOP*
* Consult Factory for MSOP Package
Availability.
Applications
鈥?Smart Phones and Personal Data Assistants
(PDA)
鈥?Portable Media Players(PMP)
鈥?Ultra Mobile Devices(UMD)
鈥?Digital Cameras
鈥?MP3 Players
鈥?Bluetooth Headsets
鈥?Handheld Medical Devices
鈥?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 magnitude
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 accommodated 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 device
reliability.
The MCP73837/8 are fully specified over the ambient
temperature range of -40擄C to +85擄C.
The MCP73837/8 devices are available in a 10-Lead,
3 mm x 3 mm, DFN package or in a 10-Lead MSOP
package.
漏
2007 Microchip Technology Inc.
DS22071A-page 1

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