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| 型号： | MCP73X23EV-LFP |
| 厂商： | Microchip Technology |
| 文件页数： | 17/34页 |
| 文件大小： | 0K |
| 描述： | BOARD EVAL BATT CHARGER MCP73X23 |
| 标准包装： | 1 |
| 主要目的： | 电源管理，电池充电器 |
| 嵌入式： | 否 |
| 已用 IC / 零件： | MCP73123，MCP73223 |
| 主要属性： | 1 芯或 2 芯 LiFePO4（磷酸铁锂），500mA 时为 3.6V 和 7.2V |
| 次要属性： | 安全计时器，热保护，自动终止充电和再充电 |
| 已供物品： | 板 |
| 产品目录页面： | 669 (CN2011-ZH PDF) |
| 相关产品： | MCP73223T-C2SI/MF-ND - IC LI IRON PHOSPHATE CTRLR 10DFN MCP73123T-22SI/MF-ND - IC LI IRON PHOSPHATE CTRLR 10DFN MCP73223-C2SI/MF-ND - IC LI IRON PHOSPHATE CTRLR 10DFN MCP73123-22SI/MF-ND - IC LI IRON PHOSPHATE CTRLR 10DFN |
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MCP73123/223
5.0
DETAILED DESCRIPTION
5.3.2
BATTERY CHARGE CONTROL
OUTPUT (V BAT )
5.1
Undervoltage Lockout (UVLO)
The battery charge control output is the drain terminal
An internal undervoltage lockout (UVLO) circuit
monitors the input voltage and keeps the charger in
Shutdown mode until the input supply rises above the
UVLO threshold. In the event a battery is present when
the input power is applied, the input supply must rise
approximately 150 mV above the battery voltage
before the MCP73123/223 becomes operational.
The UVLO circuit places the device in shutdown mode
if the input supply falls to approximately 150 mV above
the battery voltage.The UVLO circuit is always active.
At any time, the input supply is below the UVLO
threshold or approximately 150 mV of the voltage at the
V BAT pin, the MCP73123/223 device is placed in a
Shutdown mode.
of an internal P-channel MOSFET. The MCP73123/223
provides 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.
5.3.3 BATTERY DETECTION
The MCP73123/223 detects the battery presence with
charging of the output capacitor. The charge flow will
initiate when the voltage on V BAT is pulled below the
“Electrical Characteristics” for V RECHARGE values.
The value will be the same for non-rechargeable
device.
When V BAT > V REG + Hysteresis, the charge will be
5.2
Overvoltage Protection (OVP)
suspended or not started, depending on the condition,
to prevent overcharge that may occur.
An internal overvoltage protection (OVP) circuit
monitors the input voltage and keeps the charger in
5.4
Preconditioning
shutdown mode when the input supply rises above
the OVP threshold. The hysteresis of OVP is
approximately 150 mV for the MCP73123/223 device.
The MCP73123/223 device is operational between
UVLO and OVP threshold. The OVP circuit is also
recognized as an overvoltage lockout (OVLO).
If the voltage at the V BAT pin is less than the
preconditioning threshold, the MCP73123/223 device
enters a preconditioning mode. The preconditioning
“Electrical Characteristics” for preconditioning
threshold options.
5.3
Charge Qualification
In this mode, the MCP73123/223 device supplies 10%
of the fast charge current (established with the value of
When the input power is applied, the input supply must
rise 150 mV above the battery voltage before the
MCP73123/223 becomes operational.
The automatic power down circuit places the device in
a shutdown mode if the input supply falls to within
the resistor connected to the PROG pin) to the battery.
When the voltage at the V BAT pin rises above the
preconditioning threshold, the MCP73123/223 device
enters the Constant Current (Fast Charge) mode.
+50 mV of the battery voltage.
Note:
The MCP73123/223 also offers options
The automatic circuit is always active. At any time the
input supply is within +50 mV of the voltage at the
V BAT pin, the MCP73123/223 is placed in a Shutdown
mode.
For a charge cycle to begin, the automatic power
down conditions must be met and the charge enable
input must be above the input high threshold.
with no preconditioning.
5.4.1 TIMER EXPIRED DURING
PRECONDITIONING MODE
If the internal timer expires before the voltage threshold
is reached for fast charge mode, a timer fault is
indicated and the charge cycle terminates. The
MCP73123/223 device remains in this condition until
Note:
In order to extend the battery cycle life, the
charge will initiate only when battery
voltage is below 3.4V per cell.
the battery is removed or input power is cycled. If the
battery is removed, the MCP73123/223 device enters
the Standby mode, where it remains until a battery is
reinserted.
5.3.1 BATTERY MANAGEMENT INPUT
SUPPLY (V DD )
The V DD input is the input supply to the MCP73123/
223. The MCP73123/223 automatically enters a
Power-down mode if the voltage on the V DD input falls
to within +50 mV of the battery voltage. This feature
prevents draining the battery pack when the V DD
supply is not present.
? 2009-2011 Microchip Technology Inc.
Note:
The typical preconditioning timer for
MCP73123/223 is 32 minutes. The
MCP73123/223 also offers options with no
preconditioning timer.
DS22191D-page 17
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