MCP73853-I/ML Microchip Technology, MCP73853-I/ML Datasheet - Page 14

• Manufacturer Part Number: MCP73853-I/ML
• Description: IC,Battery Management,LLCC,16PIN,PLASTIC
• Manufacturer: Microchip Technology

Specifications of MCP73853-I/ML

• Function: Charge Management
• Battery Type: Lithium-Ion (Li-Ion), Lithium-Polymer (Li-Pol)
• Voltage - Supply: 4.5 V ~ 5.5 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 16-QFN
• Output Voltage: 4.221 V
• Output Current: 100 mA
• Operating Supply Voltage: 4.5 V to 5.5 V
• Supply Current: 4 mA
• Maximum Operating Temperature: + 85 C
• Minimum Operating Temperature: - 40 C
• Mounting Style: SMD/SMT
• Uvlo Start Threshold: 4.65 V
• Uvlo Stop Threshold: 4.55 V
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Lead free / RoHS Compliant

MCP73853/55
5.1.6
The MCP73853 monitors the battery voltage at the
V
terminal of the battery pack.
5.1.7
The battery charge control output is the drain terminal of
an internal P-channel MOSFET. The MCP7385X
devices provide constant-current and constant-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
5.2.1
Two status outputs provide information on the state of
charge for the MCP73853. One status output provides
information on the state of charge for the MCP73855.
The current-limited, open-drain outputs can be used to
illuminate external LEDs. Optionally, a pull-up resistor
can be used on the output for communication with a
host microcontroller. Table 5-1 and Table 5-2 summa-
rize the state of the status outputs during a charge
cycle for the MCP73853 and MCP73855, respectively.
TABLE 5-1:
DS21915A-page 14
Qualification
Preconditioning
Constant-
current Fast
Charge
Constant-
voltage
Charge
Complete
Fault
THERM Invalid
Disabled -
Sleep mode
Input Voltage
Disconnected
CYCLE STATE
BAT3
Note:
CHARGE
pin. This input is tied directly to the positive
Digital Circuitry
BATTERY VOLTAGE SENSE (V
BATTERY CHARGE CONTROL
OUTPUT (V
CHARGE STATUS OUTPUTS
(STAT1,STAT2)
OFF state: open-drain is high-impedance;
ON state: open-drain can sink current,
typically
between OFF and ON states.
STATUS OUTPUTS – MCP73853
50% duty cycle)
Flashing (1 Hz,
7 mA;
STAT1
OFF
OFF
OFF
OFF
OFF
BAT1
ON
ON
ON
, V
FLASHING:
BAT2
50% duty cycle)
Flashing (1 Hz,
)
STAT2
OFF
OFF
OFF
OFF
OFF
OFF
OFF
ON
toggles
BAT3
)
TABLE 5-2:
The flashing rate (1 Hz) is based off a timer capacitor
(C
value of the timer capacitor.
5.2.1.1
STAT2 is on whenever the input voltage is above the
under voltage lockout, the device is enabled, and all
conditions are normal.
During a fault condition, the STAT1 status output will be
off and the STAT2 status output will flash. To recover
from a fault condition, the input voltage must be
removed and then reapplied, or the enable input, EN,
must be de-asserted to a logic-low, then asserted to a
logic-high.
When the voltage on the THERM input is outside the
preset window, the charge cycle will either not start or
be suspended. However, the charge cycle is not termi-
nated, with recovery beng automatic. The charge cycle
will resume (or start) once the THERM input is valid and
all other qualification parameters are met.
5.2.2
The V
the MCP7385X devices. With V
MCP7385X devices regulate to 4.1V. With V
V
5.2.3
The logic enable input pin (EN) 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 EN pin, or tying
it to the input source, enables the device. Applying a
logic-low input signal disables the device and termi-
nates a charge cycle. When disabled, the device’s
supply current is reduced to 0.28 µA, typically.
Qualification
Preconditioning
Constant Current Fast Charge
Constant Voltage
Charge Complete
Fault
THERM Invalid
Disabled - Sleep mode
Input Voltage Disconnected
DD
Note:
TIMER
, the MCP7385X devices regulate to 4.2V.
CHARGE CYCLE STATE
SET
) of 0.1 µF. The rate will vary based on the
input selects the regulated output voltage of
OFF state: open-drain is high impedance;
ON state: open-drain can sink current, typ-
ically 7 mA; FLASHING: toggles between
OFF state and ON state.
V
LOGIC ENABLE (EN)
SET
MCP73853 Only
INPUT
STATUS OUTPUT – MCP73855
 2004 Microchip Technology Inc.
SET
50% duty cycle)
50% duty cycle)
Flashing (1Hz,
Flashing (1Hz,
tied to V
STAT1
OFF
OFF
OFF
OFF
ON
ON
ON
SET
SS
tied to
, the