Microchip MCP73826 Single Cell Lithium-Ion Charge Management Controller Data Sheet
Summary
Enhance power management for single-cell Lithium-Ion batteries using this high-accuracy charge controller. Designed for space-limited, cost-sensitive applications, the unit ensures safe charging through a three-phase process: preconditioning, controlled current, and constant voltage regulation. The manual details professional integration guidelines, operational specifications, and automatic deep cell protection features, making it ideal for portable electronics like personal assistants, cellular phones, and handheld instruments requiring reliable power.
Page 1 Text Content
MCP73826
Single Cell Lithium-Ion Charge Management Controller
Features Description
Linear Charge Management Controller for Single The MCP73826 is a linear charge management con- Lithium-Ion Cells troller for use in space-limited, cost sensitive applica-
High Accuracy Preset Voltage Regulation: tions. The MCP73826 combines high accuracy constant voltage, controlled current regulation, and cell
+1% (max)
preconditioning in a space saving 6-pin SOT-23A pack-
Two Preset Voltage Regulation Options:
age. The MCP73826 provides a stand-alone charge
4.1V - MCP73826-4.1
management solution.
4.2V - MCP73826-4.2
The MCP73826 charges the battery in three phases:
Programmable Charge Current
preconditioning, controlled current, and constant volt-
Automatic Cell Preconditioning of Deeply
age. If the battery voltage is below the internal low-volt-
Depleted Cells, Minimizing Heat Dissipation Dur-
age threshold, the battery is preconditioned with a
ing Initial Charge Cycle
foldback current. The preconditioning phase protects
Automatic Power-Down when Input Power the lithium-ion cell and minimizes heat dissipation. Removed
Following the preconditioning phase, the MCP73826
Temperature Range: -20°C to +85°C
enters the controlled current phase. The MCP73826
Packaging: 6-Pin SOT-23A allows for design flexibility with a programmable charge
current set by an external sense resistor. The charge
Applications
current is ramped up, based on the cell voltage, from the foldback current to the peak charge current estab-
Single Cell Lithium-Ion Battery Chargers
lished by the sense resistor. This phase is maintained
Personal Data Assistants
until the battery reaches the charge-regulation voltage.
Cellular Telephones
Then, the MCP73826 enters the final phase, constant
Hand Held Instruments
voltage. The accuracy of the voltage regulation is better
Cradle Chargers
than ±1% over the entire operating temperature range
Digital Cameras and supply voltage range. The MCP73826-4.1 is preset
to a regulation voltage of 4.1V, while the MCP73826-
Typical Application Circuit
4.2 is preset to 4.2V. m A Lithium-Ion Battery Charger The MCP73826 operates with an input voltage range from 4.5V to 5.5V. The MCP73826 is fully specified
NDS8434MA2Q705 mΩ over the ambient temperature range of -20°C to +85°C.
VIN 5V
Single
Package Type+
µF Lithium-Ion
VDRVVSNS
6-Pin SOT-23A
VIN VBAT
SHDN1 GND
SHDN VSNS
MCP73826
GND 5MCP73826 VIN
VBAT VDRV
2002 Microchip Technology Inc. DS21705A-page 1
Page Summary Contents For Microchip MCP73826 Single Cell Lithium-Ion Charge Management Controller Data Sheet
Manual Details
| Brand | ION |
|---|---|
| Pages | 24 |
| File Size | 504.38 KB |
| Published | May 24, 2026 |
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Frequently Asked Questions
What is the input voltage range for the MCP73826?
The operational input voltage range (VIN) is 4.5V to 5.5V.
How does the charger handle deep discharge conditions?
If the battery voltage drops below a set threshold, the device enters an automatic preconditioning phase with a foldback current.
What are the two specific regulation voltages offered?
Two versions are available: MCP73826-4.1 (set to 4.1V) and MCP73826-4.2 (set to 4.2V).
What is the typical operating temperature range for the device?
The ambient temperature range is -20°C to +85°C.