MCP73833-BZI/UN Microchip Technology, MCP73833-BZI/UN Datasheet - Page 17

• Manufacturer Part Number: MCP73833-BZI/UN
• Description: 1A Li-Ion/Li-Poly Charge Mgmt Controller, PG Output 10 MSOP 3x3mm TUBE
• Manufacturer: Microchip Technology

Specifications of MCP73833-BZI/UN

• Function: Charge Management
• Battery Type: Lithium-Ion (Li-Ion), Lithium-Polymer (Li-Pol)
• Voltage - Supply: 3.75 V ~ 6 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 10-TFSOP (0.118", 3.00mm Width)
• Output Voltage: 4.2 V, 4.35 V, 4.4 V, 4.5 V
• Output Current: 1200 mA
• Operating Supply Voltage: 3.75 V to 6 V
• Maximum Operating Temperature: + 85 C
• Minimum Operating Temperature: - 40 C
• Mounting Style: SMD/SMT
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With: MCP73833EV - BOARD EVAL FOR MCP73833
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

5.0
5.1
5.1.1
The V
The MCP73833/4 automatically enters a Power-down
mode if the voltage on the V
UVLO voltage (V
the battery pack when the V
5.1.2
Fast charge current regulation can be scaled by placing
a programming resistor (R
to V
are calculated using the
EQUATION 5-1:
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
The battery charge control output is the drain terminal
of an internal P-channel MOSFET. The MCP73833/4
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.
5.1.4
The MCP73833/4 continuously monitors battery
temperature during a charge cycle by measuring the
voltage between the THERM and V
50 µA current source provides the bias for most
common
(NTC) or positive-temperature coefficient (PTC)
thermistors.The current source is controlled, avoiding
measurement sensitivity to fluctuations in the supply
voltage (V
at the THERM pin to factory set thersholds of 1.20V
and 0.25V, typically. Once a volage outside the
thresholds is detected during a charge cycle, the
MCP73833/4 immediately suspends the charge cycle.
The MCP73833/4 suspends charge by turning off the
© 2009 Microchip Technology Inc.
Where:
SS
R
DD
PROG
. The program resistor and the charge current
I
REG
DETAILED DESCRIPTION
Analog Circuitry
input is the input supply to the MCP73833/4.
DD
10 kΩ
BATTERY MANAGEMENT INPUT
SUPPLY (V
CURRENT REGULATION SET
(PROG)
BATTERY CHARGE CONTROL
OUTPUT (V
TEMPERATURE QUALIFICATION
(THERM)
). The MCP73833/4 compares the voltage
= kilo-ohms
= milliampere
STOP
I
negative-temperature
REG
). This feature prevents draining
Equation
DD
=
BAT
PROG
)
DD
---------------- -
R
1000V
)
PROG
DD
supply is not present.
) from the PROG input
input falls below the
5-1:
SS
pins. An internal
coefficient
pass transistor and holding the timer value. The charge
cycle resumes when the voltage at the THERM pin
returns to the normal range.
If temperature monitoring is not required, place a
standard 10 kΩ resistor from THERM to V
5.1.4.1
The MCP73833/4 can be placed in a system test mode.
In this mode, the MCP73833/4 operates as a low
dropout linear regulator (LDO). The output voltage is
regulated to the factory set voltage regulation option.
The available output current is limitted to the
programmed fast charge current. For stability, the V
output must be bypassed to V
capacitance of 1 µF for output currents up to 250 mA.
A minimum capacitance of 4.7 µF is required for output
currents above 250 mA.
The system test mode is entered by driving the THERM
input greater than (V
connected to the output. In this mode, the MCP73833/
4 can be used to power the system without a battery
present.
5.2
5.2.1
The charge status outputs have two different states:
Low (L), and High Impedance (Hi-Z). The charge status
outputs can be used to illuminate LEDs. Optionally, the
charge status outputs can be used as an interface to a
host microcontroller.
the status outputs during a charge cycle.
TABLE 5-1:
Shutdown
Standby
Charge in Progress
Charge Complete (EOC)
Temperature Fault
Timer Fault
System Test Mode
Note 1: I
Charge Cycle State
2: A pull-down current source on the
3: During system test mode, the PROG
4: System test mode shall be exited by
Digital Circuitry
STATUS INDICATORS AND POWER
GOOD (PG - OPTION)
stand-by, and system test modes.
THERM input is active only in stand-by
and system test modes.
input sets the available output current
limit.
releasing the THERM input or cycling
input power.
THERM
System Test (LDO) Mode
STATUS OUTPUTS
Table 5-1
is disabled during shutdown,
MCP73833/4
DD
-100 mV) with no battery
STAT1
Hi-Z
Hi-Z
Hi-Z
Hi-Z
Hi-Z
summarize the state of
L
L
SS
DS22005B-page 17
with a minimum
STAT2
Hi-Z
Hi-Z
Hi-Z
Hi-Z
Hi-Z
L
L
SS
.
Hi-Z
PG
L
L
L
L
L
L
BAT