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PDF MCP73826 Data sheet ( Hoja de datos )
| Número de pieza | MCP73826 | |
| Descripción | Single Cell Lithium-Ion Charge Management Controller | |
| Fabricantes | Microchip Technology | |
| Logotipo |  |
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MCP73826
Single Cell Lithium-Ion Charge Management Controller
Features
• Linear Charge Management Controller for Single
Lithium-Ion Cells
• High Accuracy Preset Voltage Regulation:
+1% (max)
• Two Preset Voltage Regulation Options:
- 4.1V - MCP73826-4.1
- 4.2V - MCP73826-4.2
• Programmable Charge Current
• Automatic Cell Preconditioning of Deeply
Depleted Cells, Minimizing Heat Dissipation Dur-
ing Initial Charge Cycle
• Automatic Power-Down when Input Power
Removed
• Temperature Range: -20°C to +85°C
• Packaging: 6-Pin SOT-23A
Applications
• Single Cell Lithium-Ion Battery Chargers
• Personal Data Assistants
• Cellular Telephones
• Hand Held Instruments
• Cradle Chargers
• Digital Cameras
Typical Application Circuit
500 mA Lithium-Ion Battery Charger
MA2Q705
VIN
5V
10 µF
100 k
100 m NDS8434
6
VSNS
5 VIN
1 SHDN
4
VDRV
VBAT 3
GND 2
MCP73826
+ Single
Lithium-Ion
- Cell
10 µF
Description
The MCP73826 is a linear charge management con-
troller for use in space-limited, cost sensitive applica-
tions. The MCP73826 combines high accuracy
constant voltage, controlled current regulation, and cell
preconditioning in a space saving 6-pin SOT-23A pack-
age. The MCP73826 provides a stand-alone charge
management solution.
The MCP73826 charges the battery in three phases:
preconditioning, controlled current, and constant volt-
age. If the battery voltage is below the internal low-volt-
age threshold, the battery is preconditioned with a
foldback current. The preconditioning phase protects
the lithium-ion cell and minimizes heat dissipation.
Following the preconditioning phase, the MCP73826
enters the controlled current phase. The MCP73826
allows for design flexibility with a programmable charge
current set by an external sense resistor. The charge
current is ramped up, based on the cell voltage, from
the foldback current to the peak charge current estab-
lished by the sense resistor. This phase is maintained
until the battery reaches the charge-regulation voltage.
Then, the MCP73826 enters the final phase, constant
voltage. The accuracy of the voltage regulation is better
than ±1% over the entire operating temperature range
and supply voltage range. The MCP73826-4.1 is preset
to a regulation voltage of 4.1V, while the MCP73826-
4.2 is preset to 4.2V.
The MCP73826 operates with an input voltage range
from 4.5V to 5.5V. The MCP73826 is fully specified
over the ambient temperature range of -20°C to +85°C.
Package Type
6-Pin SOT-23A
SHDN 1
GND 2
VBAT 3
MCP73826
6 VSNS
5 VIN
4 VDRV
2002-2013 Microchip Technology Inc.
DS21705B-page 1
1 page  
MCP73826
2.0 TYPICAL PERFORMANCE CHARACTERISTICS
Note:
The graphs and tables provided following this note are a statistical summary based on a limited number of
samples and are provided for informational purposes only. The performance characteristics listed herein
are not tested or guaranteed. In some graphs or tables, the data presented may be outside the specified
operating range (e.g., outside specified power supply range) and therefore outside the warranted range.
Note: Unless otherwise indicated, IOUT = 10 mA, Constant Voltage Mode, TA = 25°C. Refer to Figure 1-1 for test circuit.
FIGURE 2-1: Output Voltage vs. Output Current
(MCP73826-4.2).
FIGURE 2-4: Supply Current vs. Output Current.
FIGURE 2-2: Output Voltage vs. Input Voltage
(MCP73826-4.2).
FIGURE 2-5: Supply Current vs. Input Voltage.
FIGURE 2-3: Output Voltage vs. Input Voltage
(MCP73826-4.2).
FIGURE 2-6: Supply Current vs. Input Voltage.
2002-2013 Microchip Technology Inc.
DS21705B-page 5
5 Page 
MCP73826
6.0 APPLICATIONS
The MCP73826 is designed to operate in conjunction
with a host microcontroller or in stand-alone applica-
tions. The MCP73826 provides the preferred charge
VOLTAGE
REGULATED
WALL CUBE
MA2Q705
22 k
10 µF
algorithm for Lithium-Ion cells, controlled current fol-
lowed by constant voltage. Figure 6-1 depicts a typical
stand-alone application circuit and Figure 6-2 depicts
the accompanying charge profile.
Q1
RSENSE NDS8434
100 m
IOUT
PACK+
10 µF
100 k
SHDN
GND
VBAT
1
2
3
MCP73826
6 VSNS
5 VIN
4 VDRV
+
-
FIGURE 6-1: Typical Application Circuit.
PACK-
SINGLE CELL
LITHIUM-ION
BATTERY PACK
REGULATION
VOLTAGE
(VREG)
REGULATION
CURRENT
(IOUT(PEAK))
TRANSITION
THRESHOLD
PRECONDITIONING
PHASE
CONTROLLED CURRENT
PHASE
CHARGE
VOLTAGE
CONSTANT VOLTAGE
PHASE
PRECONDITION
CURRENT
CHARGE
CURRENT
FIGURE 6-2: Typical Charge Profile.
2002-2013 Microchip Technology Inc.
DS21705B-page 11
11 Page | ||
| Páginas | Total 24 Páginas | |
| PDF Descargar | [ Datasheet MCP73826.PDF ] | |
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