參數(shù)資料
型號(hào)： MCP73828
廠商： Microchip Technology Inc.
英文描述： Single Cell Lithium-Ion Charge Management Controller with Charge Complete Indicator and Temperature Monitor
中文描述： 單節(jié)鋰離子電池充電管理控制器，充電完畢指示燈和溫度監(jiān)測(cè)器
文件頁(yè)數(shù)： 10/24頁(yè)
文件大小： 499K
代理商： MCP73828
MCP73828
DS21706A-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
CELL TEMPERATURE MONITOR (THERM)
The cell temperature monitor, THERM, input is used to
inhibit charging when the battery temperature exceeds
a predetermined temperature range. This temperature
range is programmed externally with either a single
Thermistor or a resistor/Thermistor network. An exam-
ple of this type of network is illustrated in Figure 6-1.
The MCP73828 internally generates a current source
out of the THERM pin (shown in the Functional Block
Diagram). The nominal value of the current source
(I
THERM
) is 25 μA. This current flows through the ther-
mistor network to ground. The factory programmed
voltage range of the THERM input (V
TH
) is 113 mV
(typ) to 839 mV (typ). Dependent on the type of Ther-
mistor used and the resistive network, the temperature
trip points can be controlled. If the THERM pin is lower
that 113 mV or higher than 839 mV the device will shut-
down operation. This condition can be corrected by
bringing the THERM pin back between these threshold
voltages.
As an application example, if a 10 k
NTC Thermistor
with a sensitivity index (b) of 3982 is connected from
THERM to ground, the operational temperature range
is from –0.5°C to 44.2°C. See Section 6.1.1.6 for more
details concerning using the resistive network.
Alternatively, a positive temperature coefficient, PTC,
thermistor can be utilized. Connect the thermistor from
the THERM input to GND. If temperature monitoring is
not required, replace the thermistor with a standard
10 k
resistor.
5.1.2
CELL VOLTAGE MONITOR INPUT (V
BAT
)
The MCP73828 monitors the cell voltage at the V
BAT
pin. This input is tied directly to the positive terminal of
the battery. The MCP73828 is offered in two fixed-volt-
age versions for single cells with either coke or graphite
anodes:
4.1V
(MCP73828-4.1)
(MCP73828-4.2).
and
4.2V
5.1.3
GATE DRIVE OUTPUT (V
DRV
)
The MCP73828 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
OUT
.
5.1.5
SUPPLY VOLTAGE (V
IN
)
The V
IN
input is the input supply to the MCP73828. The
MCP73828 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 0.7 μA, typically.
5.2.2
CHARGE COMPLETE OUTPUT (CD10)
A charge complete indicator, CD10, provides informa-
tion 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 commu-
nication with a microcontroller. Table 5-1 summarizes
the state of this output during a charge cycle.
TABLE 5-1:
Charge Complete Output.
Charge Cycle State
Mode
Qualification
Preconditioning
Controlled Current Fast Charge
Constant Voltage
Charge Complete
Temperature Monitor Invalid
Disabled - Sleep mode
Battery Disconnected
OFF
ON
ON
ON
OFF
OFF
OFF
OFF
R
SENSE
V
I
OUT
-----------
=
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MCP73828-4.1VUATR 功能描述:電池管理 W/ Charge Comp Mon RoHS:否 制造商:Texas Instruments 電池類(lèi)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
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