參數(shù)資料
型號(hào)： MCP73832-5DCI/MC
元件分類(lèi)： 電源管理
英文描述： 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO8
封裝： 2 X 3 MM, 0.90 MM HEIGHT, PLASTIC, MO-229VCED-2, DFN-8
文件頁(yè)數(shù)： 4/24頁(yè)
文件大小： 786K
代理商： MCP73832-5DCI/MC
MCP73831/2
DS21984C-page 12
2007 Microchip Technology Inc.
5.0
DETAILED DESCRIPTION
5.1
Analog Circuitry
5.1.1
BATTERY MANAGEMENT INPUT
SUPPLY (VDD)
The VDD input is the input supply to the MCP73831/2.
The MCP73831/2 automatically enter a Power-Down
mode if the voltage on the VDD input falls below the
UVLO voltage (VSTOP). This feature prevents draining
the battery pack when the VDD supply is not present.
5.1.2
CURRENT REGULATION SET
(PROG)
Fast charge current regulation can be scaled by placing
a programming resistor (RPROG) from the PROG input
to VSS. The program resistor and the charge current
are calculated using the following equation:
The preconditioning trickle charge current and the
charge termination current are ratiometric to the fast
charge current based on the selected device options.
5.1.3
BATTERY CHARGE CONTROL
OUTPUT (VBAT)
The battery charge control output is the drain terminal
of an internal P-channel MOSFET. The MCP73831/2
provide constant current and voltage regulation to the
battery pack by controlling this MOSFET in the linear
region. The battery charge control output should be
connected to the positive terminal of the battery pack.
5.2
Digital Circuitry
5.2.1
STATUS INDICATOR (STAT)
The charge status output of the MCP73831 has three
different states: High (H), Low (L), and High-Imped-
ance (Hi-Z). The charge status output of the
MCP73832 is open-drain, and, as such, has two
different states: Low (L), and High-Impedance (Hi-Z).
The charge charge status output can be used to
illuminate 1, 2, or tri-color LEDs. Optionally, the charge
status output can be used as an interface to a host
microcontroller.
Table 5-1 summarize the state of the status output
during a charge cycle..
5.2.2
DEVICE DISABLE (PROG)
The current regulation set input pin (PROG) can be
used to terminate a charge at any time during the
charge cycle, as well as to initiate a charge cycle or
initiate a recharge cycle.
Placing a programming resistor from the PROG input to
VSS enables the device. Allowing the PROG input to
float or by applying a logic-high input signal, disables
the device and terminates a charge cycle. When
disabled, the device’s supply current is reduced to
25 A, typically.
IREG
1000V
RPROG
-----------------
=
Where:
RPROG
=kOhms
IREG
=
milliampere
TABLE 5-1:
STATUS OUTPUT
Charge Cycle State
STAT1
MCP73831 MCP73832
Shutdown
Hi-Z
No Battery Present
Hi-Z
Preconditioning
L
Constant-Current Fast
Charge
LL
Constant Voltage
L
Charge Complete –
Standby
HHi-Z
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