MCP73833T-B6I/MF Microchip Technology, MCP73833T-B6I/MF Datasheet - Page 16
![IC LI-ION/LI-POLY CTRLR 10DFN](/photos/6/59/65939/10-dfn_pkg_sml.jpg)
MCP73833T-B6I/MF
Manufacturer Part Number
MCP73833T-B6I/MF
Description
IC LI-ION/LI-POLY CTRLR 10DFN
Manufacturer
Microchip Technology
Specifications of MCP73833T-B6I/MF
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-DFN
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
MCP73833/4
6.1.1.2
The worst-case power dissipation in the battery
charger occurs when the input voltage is at the
maximum and the device has transitioned from the
Preconditioning mode to the Constant-current mode. In
this case, the power dissipation is:
Power dissipation with a 5V, ±10% input voltage source
is:
This power dissipation with the battery charger in the
MSOP-10 package will cause thermal regulation to be
entered as depicted in
3 mm x 3 mm DFN package could be utilized to reduce
charge cycle times.
6.1.1.3
The MCP73833/4 is stable with or without a battery
load. In order to maintain good AC stability in the Con-
stant-voltage mode, a minimum capacitance of 4.7 µF
is recommended to bypass the V
capacitance provides compensation when there is no
battery load. In addition, the battery and interconnec-
tions appear inductive at high frequencies. These
elements are in the control feedback loop during
Constant-voltage
capacitance may be necessary to compensate for the
inductive nature of the battery pack.
Virtually any good quality output filter capacitor can be
used, independent of the capacitor’s minimum
Effective Series Resistance (ESR) value. The actual
value of the capacitor (and its associated ESR)
depends on the output load current. A 4.7 µF ceramic,
tantalum or aluminum electrolytic capacitor at the
output is usually sufficient to ensure stability for output
currents up to a 500 mA.
6.1.1.4
The MCP73833/4 provides protection from a faulted or
shorted input. Without the protection, a faulted or
shorted input would discharge the battery pack through
the body diode of the internal pass transistor.
DS22005A-page 16
Where:
PowerDissipation
PowerDissipation
I
V
V
REGMAX
PTHMIN
DDMAX
Thermal Considerations
External Capacitors
Reverse-Blocking Protection
= the maximum input voltage
= the maximum fast charge current
= the minimum transition threshold
voltage
=
mode.
(
=
V DDMAX V PTHMIN
(
5.5V 2.7V
Figure
–
Therefore,
–
6-3. Alternatively, the
) 550mA
BAT
×
pin to V
)
the
×
I REGMAX
=
1.54W
SS
bypass
. This
6.1.1.5
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
V
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
100 µA, typically.
6.1.1.6
The charge temperature window can be set by placing
fixed value resistors in series-parallel with a thermistor.
The resistance values of R
calculated with the following equations in order to set
the temperature window of interest.
For NTC thermistors:
For example, by utilizing a 10 kΩ at 25C NTC
thermistor with a sensitivity index, β, of 3892, the
charge temperature range can be set to 0C - 50C by
placing a 1.54 kΩ resistor in series (R
69.8 kΩ resistor in parallel (R
depicted in
6.1.1.7
A status output provides information on the state of
charge. The output can be used to illuminate external
LEDs or interface to a host microcontroller. Refer to
Table 5-1
output during a charge cycle.
Where:
SS
enables the device. Allowing the PROG input to
R
R
R
lower temperature of interest
R
temperature of interest.
T1
T2
COLD
HOT
is the fixed series resistance
is the fixed parallel resistance
for a summary of the state of the status
is the thermistor resistance at the upper
Figure
24k
Charge Inhibit
Temperature Monitoring
Charge Status Interface
is the thermistor resistance at the
5kΩ
Ω
6-1.
=
=
R
R
T1
T1
© 2006 Microchip Technology Inc.
+
+
R
---------------------------- -
R
-------------------------------- -
R
R
T2
T2
T2
T2
T2
T1
) with the thermistor as
+
×
+
×
R
R
R
R
and R
HOT
COLD
HOT
COLD
T2
T1
), and a
can be