MCP73113 Microchip Technology Inc., MCP73113 Datasheet - Page 17

• Manufacturer Part Number: MCP73113
• Description: Single-cell Li-ion / Li-polymer Battery Charge Management Controller With Input Overvoltage Protection
• Manufacturer: Microchip Technology Inc.

5.0
5.1
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 MCP73113 device become 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 thresh-
old or approximately 150 mV of the voltage at the V
pin, the MCP73113 device is placed in a shutdown
mode.
5.2
An internal overvoltage protection (OVP) circuit
monitors the input voltage and keeps the charger in
shutdown mode when the input supply rises above the
OVP threshold. The hysteresis of OVP is approxi-
mately 150 mV for the MCP73113 device.
The MCP73113 device is operational between UVLO
and OVP threshold. The OVP circuit is also recognized
as overvoltage lock out (OVLO).
5.3
When the input power is applied, the input supply must
rise 150 mV above the battery voltage before the
MCP73113 becomes operational.
The automatic power down circuit places the device in
a shutdown mode if the input supply falls to within
+50 mV of the battery voltage.
The automatic circuit is always active. At any time the
input supply is within +50 mV of the voltage at the
V
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.
5.3.1
The V
The MCP73113 automatically enters a Power-down
mode if the voltage on the V
+50 mV of the battery voltage. This feature prevents
draining the battery pack when the V
present.
© 2009 Microchip Technology Inc.
BAT
pin, the MCP73113 is placed in a shutdown
DD
DETAILED DESCRIPTION
Undervoltage Lockout (UVLO)
Overvoltage Protection (OVP)
Charge Qualification
input is the input supply to the MCP73113.
BATTERY MANAGEMENT INPUT
SUPPLY (V
DD
)
DD
input falls to within
DD
supply is not
BAT
5.3.2
The battery charge control output is the drain terminal
of an internal P-channel MOSFET. The MCP73113
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
The MCP73113 detects the battery presence with
charging of the output capacitor. The charge flow will
initiate when the voltage on V
V
Characteristics” for V
be the same for non-rechargeable device.
When V
suspended or not start, depends on the condition to
prevent over charge that may occur.
5.4
If the voltage at the V
tioning threshold, the MCP73113 device enters a
preconditioning mode. The preconditioning threshold is
factory set. Refer to Section 1.0 “Electrical Charac-
teristics” for preconditioning threshold options.
In this mode, the MCP73113 device supplies 10% of
the fast charge current (established with the value of
the resistor connected to the PROG pin) to the battery.
When the voltage at the V
conditioning threshold, the MCP73113 device enters
the constant current (fast charge) mode.
5.4.1
If the internal timer expires before the voltage threshold
is reached for fast charge mode, a timer fault is indi-
cated and the charge cycle terminates. The MCP73113
device remains in this condition until the battery is
removed or input power is cycled. If the battery is
removed, the MCP73113 device enters the Stand-by
mode where it remains until a battery is reinserted.
RECHARGE
Note:
Note:
BAT
Preconditioning
BATTERY CHARGE CONTROL
OUTPUT (V
BATTERY DETECTION
The MCP73113 also offer options with no
preconditioning.
TIMER EXPIRED DURING
PRECONDITIONING MODE
The typical preconditioning timer for
MCP73113 is 32 minutes. The MCP73113
also offer options with no preconditioning
timer.
threshold. Refer to Section 1.0 “Electrical
> V
REG
+ Hysteresis, the charge will be
BAT
RECHARGE
BAT
pin is less than the precondi-
BAT
MCP73113
)
pin rises above the pre-
BAT
values. The value will
is pulled below the
DS22183A-page 17