MCP73833-NVI/UN Microchip Technology, MCP73833-NVI/UN Datasheet - Page 20
![1A Li-Ion/Li-Poly Charge Mgmt Controller, PG Output 10 MSOP 3x3mm TUBE](/photos/6/59/65940/c04-021-msop_sml.jpg)
MCP73833-NVI/UN
Manufacturer Part Number
MCP73833-NVI/UN
Description
1A Li-Ion/Li-Poly Charge Mgmt Controller, PG Output 10 MSOP 3x3mm TUBE
Manufacturer
Microchip Technology
Specifications of MCP73833-NVI/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
MCP73833/4
6.1.1.2
The worst-case power dissipation in the battery char-
ger occurs when the input voltage is at the maximum
and
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
DFN-10 (3 mm x 3 mm) 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
Constant-voltage mode, a minimum capacitance of
4.7 µF is recommended to bypass the V
This capacitance provides compensation when there is
no battery load. In addition, the battery and
interconnections 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.
DS22005B-page 20
Where:
PowerDissipation
PowerDissipation
I
V
V
REGMAX
PTHMIN
DDMAX
the
device
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
has
(
5.5V 2.7V
Figure
–
Therefore,
transitioned
–
6-3. Alternatively, the
) 550mA
×
BAT
)
the
×
I REGMAX
from
=
pin to V
1.54W
bypass
the
SS
.
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
R
R
COLD
enables the device. Allowing the PROG input to
R
R
HOT
T1
T2
for a summary of the state of the status
Figure
24k
Charge Inhibit
Temperature Monitoring
Charge Status Interface
=
=
=
=
5k
Ω
Ω
6-1.
=
=
the fixed series resistance
the fixed parallel resistance
the thermistor resistance at the
lower temperature of interest
the thermistor resistance at the
upper temperature of interest
R
R
T1
T1
© 2009 Microchip Technology Inc.
+
+
-------------------------------- -
R
R
---------------------------- -
R
R
T2
T2
T2
T2
T2
T1
) with the thermistor as
+
×
+
×
R
R
R
R
and R
HOT
HOT
COLD
COLD
T2
T1
), and a
can be