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  Microchip Technology Semiconductor Electronic Components Datasheet  

MCP73855 Datasheet

(MCP73853 / MCP73855) USB Compatible Li-Ion/Li-Polymer Charge Management Controllers

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MCP73853/55
USB Compatible Li-Ion/Li-Polymer
Charge Management Controllers
Features
• Linear Charge Management Controllers
- Integrated Pass Transistor
- Integrated Current Sense
- Reverse Blocking Protection
• High-Accuracy Preset Voltage Regulation: + 0.5%
• Two Selectable Voltage Regulation Options:
- 4.1V, 4.2V
• Programmable Charge Current
• USB Compatible Charge Current Settings
• Programmable Safety Charge Timers
• Preconditioning of Deeply Depleted Cells
• Automatic End-of-Charge Control
• Optional Continuous Cell Temperature
Monitoring:
- MCP73853
• Charge Status Output for Direct LED Drive
• Fault Output for Direct LED Drive
- MCP73853
• Automatic Power-Down
• Thermal Regulation
• Temperature Range: -40°C to +85°C
• Packaging:
- 16-Lead, 4x4 mm QFN (MCP73853)
- 10-Lead, 3x3 mm DFN (MCP73855)
Applications
• Lithium-Ion/Lithium-Polymer Battery Chargers
• Personal Data Assistants (PDAs)
• Cellular Telephones
• Hand-Held Instruments
• Cradle Chargers
• Digital Cameras
• MP3 Players
• Bluetooth Headsets
• USB Chargers
Description
The MCP7385X devices are highly advanced linear
charge management controllers for use in space-
limited, cost-sensitive applications. The MCP73853
combines high-accuracy constant-voltage, constant-
current regulation, cell preconditioning, cell temperature
monitoring, advanced safety timers, automatic charge
termination, internal current sensing, reverse blocking
protection and charge status and fault indication in a
space-saving 16-lead, 4 x 4 QFN package.
The MCP73855 employs all the features of the
MCP73853, with the exception of the cell temperature
monitor and one status output. The MCP73855 is
offered in a space-saving 10-lead, 3 x 3 DFN package.
The MCP73853 and MCP73855 are designed
specifically for USB applications, adhering to all the
specifications governing the USB power bus.
The MCP7385X devices provide two selectable voltage
regulation options (4.1V or 4.2V) for use with either
coke or graphite anodes.
The MCP7385X devices provide complete, fully-
functional, charge management solutions, operating
with an input voltage range of 4.5V to 5.5V.
The MCP7385X devices are fully specified over the
ambient temperature range of -40°C to +85°C.
Package Types
16-Pin QFN
16 15 14 13
VSET 1
12 VBAT3
VDD1 2
VDD2 3
MCP73853
11 VBAT2
10 VBAT1
VSS1 4
9 VSS3
5678
10-Pin DFN
STAT1 1
10 EN
VSET 2
9 VBAT2
VDD1 3 MCP73855 8 VBAT1
VSS1 4
PROG 5
7 VSS2
6 TIMER
2004 Microchip Technology Inc.
DS21915A-page 1


  Microchip Technology Semiconductor Electronic Components Datasheet  

MCP73855 Datasheet

(MCP73853 / MCP73855) USB Compatible Li-Ion/Li-Polymer Charge Management Controllers

No Preview Available !

MCP73853/55
Typical Application
400 mA Lithium-Ion Battery Charger
5V
4.7 µF
3 VDD1
VBAT1 8
2 VSET
10 EN
VBAT2 9
1 STAT1
TIMER 6
5 PROG VSS 4, 7
MCP73855
4.7 µF
0.1 µF
+ Single
Lithium-Ion
Cell
Functional Block Diagram
VDD1
VDD2
PROG
EN
Direction
Control
VDD
G = 0.001
4 k
3 k
11 k
VREF
90 Charge Current
kControl Amplifier
+
Voltage Control
Amplifier
VREF
110 k
10 k
Charge
Termination
10
k
Comparator
+
IREG/12
UVLO
COMPARATOR
+
VUVLO
Precondition
Control
VREF
Charge_OK Precondition
Precon
Comp.
Constant-voltage/
Recharge Comp.
600 k
149 k
Power-On
Delay
VREF
1.58 k
300 k
VBAT1
VBAT2
VBAT3
THREF
THERM
TIMER
100 k
50 k
50 k
Bias and
Reference
Generator
VUVLO
VREF(1.2V)
Temperature
Comparators
+
-
+
-
MCP73853 ONLY
VSET
IREG/12
Oscillator
Drv Stat 1
Charge Control,
Charge Timers,
and
Status Logic Drv Stat 2
10.3 k
VSS1
VSS2
VSS3
STAT1
STAT2
MCP73853 ONLY
Charge_OK
DS21915A-page 2
2004 Microchip Technology Inc.


Part Number MCP73855
Description (MCP73853 / MCP73855) USB Compatible Li-Ion/Li-Polymer Charge Management Controllers
Maker Microchip Technology
Total Page 24 Pages
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