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  Microchip Technology Semiconductor Electronic Components Datasheet  

MCP73834 Datasheet

(MCP73833 / MCP73834) Microcontrollers

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MCP73833/4
Stand-Alone Linear Li-Ion / Li-Polymer Charge
Management Controller
Features
• Complete Linear Charge Management Controller
- Integrated Pass Transistor
- Integrated Current Sense
- Integrated Reverse Discharge Protection
• Constant Current / Constant Voltage Operation
with Thermal Regulation
• High Accuracy Preset Voltage Regulation:
- 4.2V, 4.35V, 4.4V, or 4.5V, + 0.75%
• Programmable Charge Current: 1A Maximum
• Preconditioning of Deeply Depleted Cells
- Selectable Current Ratio
- Selectable Voltage Threshold
• Automatic End-of-Charge Control
- Selectable Current Threshold
- Selectable Safety Time Period
• Automatic Recharge
- Selectable Voltage Threshold
• Two Charge Status Outputs
• Cell Temperature Monitor
• Low-Dropout Linear Regulator Mode
• Automatic Power-Down when Input Power
Removed
• Under Voltage Lockout
• Numerous Selectable Options Available for a
Variety of Applications:
- Refer to Section 1.0 “Electrical
Characteristics” for Selectable Options
- Refer to the Product Identification System for
Standard Options
• Available Packages:
- DFN-10 (3 mm x 3 mm)
- MSOP-10
Applications
• Lithium-Ion / Lithium-Polymer Battery Chargers
• Personal Data Assistants
• Cellular Telephones
• Digital Cameras
• MP3 Players
• Bluetooth Headsets
• USB Chargers
Description
The MCP73833/4 is a highly advanced linear charge
management controller for use in space-limited, cost
sensitive applications. The MCP73833/4 is available in
a 10-Lead, 3 mm x 3 mm DFN package or a 10-Lead,
MSOP package. Along with its small physical size, the
low number of external components required makes
the MCP73833/4 ideally suited for portable
applications. For applications charging from a USB
port, the MCP73833/4 can adhere to all the
specifications governing the USB power bus.
The MCP73833/4 employs a constant current/constant
voltage charge algorithm with selectable precondition-
ing and charge termination. The constant voltage
regulation is fixed with four available options: 4.20V,
4.35V, 4.40V, or 4.50V, to accomodate new, emerging
battery charging requirements. The constant current
value is set with one external resistor. The MCP73833/
4 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 device reliability.
Several options are available for the preconditioning
threshold, preconditioning current value, charge
termination value, and automatic recharge threshold.
The preconditioning value and charge termination
value are set as a ratio, or percentage, of the
programmed constant current value. Preconditioning
can be set to 100%. Refer to Section 1.0 “Electrical
Characteristics” for available options and the
“Product Indentification System” for standard
options.
The MCP73833/4 is fully specified over the ambient
temperature range of -40°C to +85°C.
Package Types
DFN-10
MSOP-10
VDD 1
VDD 2
STAT1 3
STAT2 4
VSS 5
VDD
VDD
STAT1
STAT2
1
2
3
4
10 VBAT
9 VBAT
EP
11
8 THERM
7 PG(TE)
6 PROG
10 VBAT
9 VBAT
8 THERM
7 PG(TE)
VSS 5
6 PROG
© 2009 Microchip Technology Inc.
DS22005B-page 1


  Microchip Technology Semiconductor Electronic Components Datasheet  

MCP73834 Datasheet

(MCP73833 / MCP73834) Microcontrollers

No Preview Available !

MCP73833/4
Typical Application
VIN
1 µF
Functional Block Diagram
1A Li-Ion Battery Charger
1,2 VDD
VBAT 9,10
1 µF
470Ω
470Ω
470Ω
3 STAT1 THERM 8
4 STAT2 PROG 6
7 PG
VSS
MCP73833
5
1 kΩ
+ Single
-
Li-Ion
Cell
T 10 kΩ
VDD
PROG
10 µA
Direction
Control
6 µA
G=0.001
G=0.001
1 kΩ
Reference
Generator
VREF (1.21V)
6 µA
310 kΩ
72.7 kΩ
50 µA
175 kΩ
54 kΩ
VSS
THERM
121 kΩ
470.6kΩ
1 MΩ
121 kΩ
6 kΩ
157.3 kΩ
+
- SHDN
+
- LDO
+
- UVLO
+
- HTVT
+
- LTVT
CURRENT
+ LIMIT
-
111 kΩ
+
- PRECONDITION
+ CA
-
10 kΩ
470.6 kΩ
+
-
TERMINATIO N
+
- CHARG E
48 kΩ
+ VA
-
Charge
Control,
Timer,
and
Status
Logic
VBAT
STAT1
STAT2
PG (TE)
DS22005B-page 2
© 2009 Microchip Technology Inc.


Part Number MCP73834
Description (MCP73833 / MCP73834) Microcontrollers
Maker Microchip Technology
Total Page 30 Pages
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