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PDF MCP73842 Data sheet ( Hoja de datos )
| Número de pieza | MCP73842 | |
| Descripción | (MCP73841 - MCP73844) Advanced Single or Dual Cell Lithium-Ion/ Lithium-Polymer Charge Management Controllers | |
| Fabricantes | Microchip Technology | |
| Logotipo |  |
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M MCP73841/2/3/4
Advanced Single or Dual Cell Lithium-Ion/
Lithium-Polymer Charge Management Controllers
Features
• Linear Charge Management Controllers
• High-Accuracy Preset Voltage Regulation:
- + 0.5% (max)
• Four Preset Voltage Regulation Options:
- 4.1V - MCP73841-4.1, MCP73843-4.1
- 4.2V - MCP73841-4.2, MCP73843-4.2
- 8.2V - MCP73842-8.2, MCP73844-8.2
- 8.4V - MCP73842-8.4, MCP73844-8.4
• Programmable Charge Current
• Programmable Safety Charge Timers
• Preconditioning of Deeply Depleted Cells
• Automatic End-of-Charge Control
• Optional Continuous Cell Temperature
Monitoring (MCP73841 and MCP73842)
• Charge Status Output for Direct LED Drive
• Automatic Power-Down when Input Power
Removed
• Temperature Range: -40°C to 85°C
• Packaging: MSOP-10 - MCP73841, MCP73842
MSOP-8 - MCP73843, MCP73844
Applications
• Lithium-Ion/Lithium-Polymer Battery Chargers
• Personal Data Assistants
• Cellular Telephones
• Hand-Held Instruments
• Cradle Chargers
• Digital Cameras
• MP3 Players
Typical Application Circuit
1A Lithium-Ion Battery Charger
MA2Q705
5V
10 µF
100 mΩ NDS8434
18
SENSE DRV
2 VDD
VBAT 7
3 STAT1 VSS 6
4 EN TIMER 5
100 kΩ MCP73843
+ Single
- Lithium-Ion
Cell
10 µF
0.1 µF
Description
The MCP7384X family of devices are highly advanced
linear charge management controllers for use in
space-limited, cost-sensitive applications. The
MCP73841 and MCP73842 combine high accuracy,
constant-voltage, constant-current regulation, cell pre-
conditioning, cell temperature monitoring, advanced
safety timers, automatic charge termination and
charge status indication in space-saving, 10-pin
MSOP packages. The MCP73841 and MCP73842
provide complete, fully-functional, stand-alone charge
management solutions.
The MCP73843 and MCP73844 employ all the
features of the MCP73841 and MCP73842, with the
exception of the cell temperature monitor. The
MCP73843 and MCP73844 are offered in 8-pin MSOP
packages.
The MCP73841 and MCP73843 are designed for
applications utilizing single-cell Lithium-Ion or Lithium-
Polymer battery packs. Two preset voltage regulation
options are available (4.1V and 4.2V) for use with either
coke or graphite anodes. The MCP73841 and
MCP73843 operate with an input voltage range of 4.5V
to 12V.
The MCP73842 and MCP73844 are designed for
applications utilizing dual series cell Lithium-Ion or
Lithium-Polymer battery packs. Two preset voltage
regulation options are available (8.2V and 8.4V). The
MCP73842 and MCP73844 operate with an input
voltage range of 8.7V to 12V.
The MCP7384X family of devices are fully specified
over the ambient temperature range of -40°C to +85°C.
Package Types
SENSE
VDD
STAT1
EN
THREF
10-Pin MSOP
1 10
29
38
47
56
DRV
VBAT
VSS
TIMER
THERM
8-Pin MSOP
SENSE
VDD
STAT1
EN
1
2
3
4
8 DRV
7 VBAT
6 VSS
5 TIMER
2004 Microchip Technology Inc.
DS21823B-page 1
1 page  
MCP73841/2/3/4
DC CHARACTERISTICS (CONTINUED)
Electrical Specifications: Unless otherwise indicated, all limits apply for VDD= [VREG(Typ)+0.3V] to 12V, TA = -40°C to +85°C.
Typical values are at +25°C, VDD = [VREG(Typ) + 1V].
Parameters
Sym
Min Typ Max Units
Conditions
Enable Input
Input High-Voltage Level
Input Low-Voltage Level
Input Leakage Current
VIH
1.4 -
–
V
VIL – - 0.8 V
ILK
– 0.01 1
µA VENABLE = 12V
AC CHARACTERISTICS
Electrical Specifications: Unless otherwise indicated, all limits apply for VDD= [VREG(Typ)+0.3V] to 12V, TA = -40°C to +85°C. Typ-
ical values are at +25°C, VDD= [VREG(Typ)+1V].
Parameters
Sym
Min Typ Max Units
Conditions
UVLO Start Delay
Current Regulation
Transition Time Out of
Preconditioning
tSTART
–
–
5 msec VDD Low-to-High
tDELAY
–
–
1 msec VBAT< VPTH to VBAT > VPTH
Current Rise Time Out of
Preconditioning
tRISE
–
–
1 msec IOUT Rising to 90% of IREG
Fast Charge Safety Timer Period tFAST 1.2 1.4 1.6 Hours CTIMER = 0.1 µF
Preconditioning Current Regulation
Preconditioning Charge Safety
tPRECON
50
60
70 Minutes CTIMER = 0.1 µF
Timer Period
Charge Termination
Elapsed Time Termination Period
tTERM
2.5
2.9
3.3 Hours CTIMER = 0.1 µF
Status Indicators
Status Output turn-off
Status Output turn-on
tOFF
tON
–
–
– 200 µsec ISINK = 10 mA to 0 mA
– 200 µsec ISINK = 0 mA to 10 mA
TEMPERATURE SPECIFICATIONS
Electrical Specifications: Unless otherwise specified, all limits apply for VDD= [VREG(Typ)+0.3V] to 12V.
Typical values are at +25°C, VDD= [VREG(Typ)+1.0V].
Parameters
Sym Min Typ Max Units
Conditions
Temperature Ranges
Specified Temperature Range
Operating Temperature Range
Storage Temperature Range
Thermal Package Resistances
Thermal Resistance, MSOP-10
Thermal Resistance, MSOP-8
TA -40
TA -40
TA -65
+85
+125
+150
°C
°C
°C
θJA 113 °C/W 4-Layer JC51-7 Standard Board,
Natural Convection
θJA 206 °C/W Single-Layer SEMI G42-88 Board,
Natural Convection
2004 Microchip Technology Inc.
DS21823B-page 5
5 Page 
4.0 DEVICE OVERVIEW
The MCP7384X family of devices are highly advanced,
linear charge management controllers. Figure 4-1
depicts the operational flow algorithm from charge
initiation to completion and automatic recharge.
4.1 Charge Qualification and
Preconditioning
Upon insertion of a battery or application of an external
supply, the MCP7384X family of devices automatically
perform a series of safety checks to qualify the charge.
The input source voltage must be above the
undervoltage lockout threshold, the enable pin must be
above the logic-high level and the cell temperature
monitor must be within the upper and lower thresholds.
The cell temperature monitor applies to both the
MCP73841 and MCP73842, with the qualification
parameters being continuously monitored. Deviation
beyond the limits automatically suspends or terminates
the charge cycle.
Once the qualification parameters have been met, the
MCP7384X initiates a charge cycle. The charge status
output is pulled low throughout the charge cycle (see
Table 5-1 for charge status outputs). If the battery
voltage is below the preconditioning threshold (VPTH),
the MCP7384X preconditions the battery with a trickle-
charge. The preconditioning current is set to
approximately 10% of the fast charge regulation
current. The preconditioning trickle-charge safely
replenishes deeply depleted cells and minimizes heat
dissipation in the external pass transistor during the
initial charge cycle. If the battery voltage has not
exceeded the preconditioning threshold before the
preconditioning timer has expired, a fault is indicated
and the charge cycle is terminated.
4.2 Constant-Current Regulation –
Fast Charge
Preconditioning ends and fast charging begins, when
the battery voltage exceeds the preconditioning
threshold. Fast charge regulates to a constant-current,
IREG, based on the supply voltage minus the voltage at
the SENSE input (VFCS) developed by the drop across
an external sense resistor (RSENSE). Fast charge
continues until the battery voltage reaches the
regulation voltage (VREG); or until the fast charge timer
expires. In this case, a fault is indicated and the charge
cycle is terminated.
MCP73841/2/3/4
4.3 Constant-Voltage Regulation
When the battery voltage reaches the regulation
voltage (VREG), constant-voltage regulation begins.
The MCP7384X monitors the battery voltage at the
VBAT pin. This input is tied directly to the positive
terminal of the battery. The MCP7384X is offered in
four fixed-voltage versions for single or dual series cell
battery packs with either coke or graphite anodes:
- 4.1V (MCP73841-4.1, MCP73843-4.1)
- 4.2V (MCP73841-4.2, MCP73843-4.2)
- 8.2V (MCP73842-8.2, MCP73844-8.2)
- 8.4V (MCP73842-8.4, MCP73844-8.4)
4.4 Charge Cycle Completion and
Automatic Re-Charge
The MCP7384X monitors the charging current during
the constant-voltage regulation phase. The charge
cycle is considered complete when the charge current
has diminished below approximately 7% of the
regulation current (IREG) or the elapsed timer has
expired.
The MCP7384X automatically begins a new charge
cycle when the battery voltage falls below the recharge
threshold (VRTH), assuming all the qualification
parameters are met.
2004 Microchip Technology Inc.
DS21823B-page 11
11 Page | ||
| Páginas | Total 24 Páginas | |
| PDF Descargar | [ Datasheet MCP73842.PDF ] | |
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