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參數(shù)資料
| 型號(hào)： | MCP73827 |
| 廠商： | Microchip Technology Inc. |
| 英文描述： | Single Cell Lithium-Ion Charge Management Controller with Mode Indicator and Charge Current Monitor(單室鋰粒子充電器) |
| 中文描述： | 單節(jié)鋰離子電池充電管理控制器模式指示燈和充電電流監(jiān)視器（單室鋰粒子充電器） |
| 文件頁數(shù)： | 10/24頁 |
| 文件大?。?/td> | 555K |
| 代理商： | MCP73827 |
MCP73827
DS21704A-page 10
2002 Microchip Technology Inc.
5.0
DETAILED DESCRIPTION
Refer to the typical application circuit, Figure 6-1.
5.1
Analog Circuitry
5.1.1
CHARGE CURRENT MONITOR (I
MON
)
The I
MON
pin provides an output voltage that is propor-
tional to the battery charging current. It is an amplified
version of the sense resistor voltage drop that the cur-
rent loop uses to control the external P-channel pass
transistor. This voltage signal can be applied to the
input of an A/D Converter and used by a host microcon-
troller to display information about the state of the bat-
tery or charge current profile.
5.1.2
CELL VOLTAGE MONITORED INPUT
(V
BAT
)
The MCP73827 monitors the cell voltage at the V
BAT
pin. This input is tied directly to the positive terminal of
the battery. The MCP73827 is offered in two fixed-volt-
age versions for single cells with either coke or graphite
anodes:
4.1V
(MCP73827-4.1)
(MCP73827-4.2).
and
4.2V
5.1.3
GATE DRIVE OUTPUT (V
DRV
)
The MCP73827 controls the gate drive to an external
P-channel MOSFET, Q1. The P-channel MOSFET is
controlled in the linear region, regulating current and
voltage supplied to the cell. The drive output is auto-
matically turned off when the input supply falls below
the voltage sensed on the V
BAT
input.
5.1.4
CURRENT SENSE INPUT (V
SNS
)
Fast charge current regulation is maintained by the
voltage drop developed across an external sense resis-
tor, R
SENSE
, applied to the V
SNS
input pin. The follow-
ing formula calculates the value for R
SENSE
:
Where:
V
CS
is the current limit threshold
I
OUT
is the desired peak fast charge current in
amps. The preconditioning current is scaled to
approximately 43% of I
PEAK
.
5.1.5
SUPPLY VOLTAGE (V
IN
)
The V
IN
input is the input supply to the MCP73827. The
MCP73827 automatically enters a power-down mode if
the voltage on the V
IN
input falls below the voltage on
the V
BAT
pin. This feature prevents draining the battery
pack when the V
IN
supply is not present.
5.2
Digital Circuitry
5.2.1
SHUTDOWN INPUT (SHDN)
The shutdown input pin, SHDN, can be used to termi-
nate a charge anytime during the charge cycle, initiate
a charge cycle, or initiate a recharge cycle.
Applying a logic High input signal to the SHDN pin, or
tying it to the input source, enables the device. Apply-
ing a logic Low input signal disables the device and ter-
minates a charge cycle. In shutdown mode, the
device’s supply current is reduced to 0.5 μA, typically.
5.2.2
CHARGE STATUS OUTPUT (MODE)
A charge status output, MODE, provides information on
the state of charge. The open drain output can be used
to illuminate an external LED. Optionally, a pull-up
resistor can be used on the output for communication
with a microcontroller. Table 5-1 summarizes the state
of the charge status output during a charge cycle.
TABLE 5-1:
Charge Status Output.
R
SENSE
V
I
OUT
-----------
=
Charge Cycle State
Mode
Qualification
Preconditioning
Controlled Current Fast Charge
Constant Voltage
Disabled - Sleep mode
Battery Disconnected
OFF
ON
ON
OFF
OFF
OFF
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相關(guān)代理商/技術(shù)參數(shù) |
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|---|---|
| MCP73827-4.1VUA | 功能描述:電池管理 W/ Charge Curnt Mon RoHS:否 制造商:Texas Instruments 電池類型:Li-Ion 輸出電壓:5 V 輸出電流:4.5 A 工作電源電壓:3.9 V to 17 V 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:VQFN-24 封裝:Reel |
| MCP73827-4.1VUATR | 功能描述:電池管理 W/ Charge Curnt Mon RoHS:否 制造商:Texas Instruments 電池類型:Li-Ion 輸出電壓:5 V 輸出電流:4.5 A 工作電源電壓:3.9 V to 17 V 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:VQFN-24 封裝:Reel |
| MCP73827-4.2VUA | 功能描述:電池管理 W/ Charge Curnt Mon RoHS:否 制造商:Texas Instruments 電池類型:Li-Ion 輸出電壓:5 V 輸出電流:4.5 A 工作電源電壓:3.9 V to 17 V 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:VQFN-24 封裝:Reel |
| MCP73827-4.2VUATR | 功能描述:電池管理 W/ Charge Curnt Mon RoHS:否 制造商:Texas Instruments 電池類型:Li-Ion 輸出電壓:5 V 輸出電流:4.5 A 工作電源電壓:3.9 V to 17 V 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:VQFN-24 封裝:Reel |
| MCP73828 | 制造商:MICROCHIP 制造商全稱:Microchip Technology 功能描述:Single Cell Lithium-Ion Charge Management Controller with Charge Complete Indicator and Temperature Monitor |
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