MCP73828-4.1VUATR Microchip Technology, MCP73828-4.1VUATR Datasheet - Page 13

• Manufacturer Part Number: MCP73828-4.1VUATR
• Description: IC CONTROLLR LI-ION 4.1V 8-MSOP
• Manufacturer: Microchip Technology

Specifications of MCP73828-4.1VUATR

• Function: Charge Management
• Battery Type: Lithium-Ion (Li-Ion)
• Voltage - Supply: 4.5 V ~ 5.5 V
• Operating Temperature: -20°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
• Output Voltage: 4.141 V
• Operating Supply Voltage: 4.5 V to 5.5 V
• Supply Current: 560 mA
• Maximum Operating Temperature: + 85 C
• Minimum Operating Temperature: - 20 C
• Mounting Style: SMD/SMT
• Uvlo Start Threshold: 113 mV
• Uvlo Stop Threshold: 839 mV
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: MCP738284.1VUATR

Worst case, V
source, 100 m , 1% sense resistor, and a maximum
sink voltage of 1.6V is:
At this worst case V
must be low enough as to not impede the performance
of the charging system. The maximum allowable
R
The Fairchild NDS8434 and International Rectifier
IRF7404 both satisfy these requirements.
6.1.1.3
The MCP73828 is stable with or without a battery load.
In order to maintain good AC stability in the constant
voltage mode, a minimum capacitance of 10 µF is rec-
ommended to bypass the V
itance 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
mode. Therefore, the bypass capacitance may be nec-
essary 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 ESR
(Effective Series Resistance) value. The actual value of
the capacitor and its associated ESR depends on the
forward trans conductance, g
external pass transistor. A 10 µF tantalum or aluminum
electrolytic capacitor at the output is usually sufficient
to ensure stability for up to a 1 A output current.
6.1.1.4
The optional reverse blocking protection diode
depicted in Figure 6-1 provides protection from a
faulted or shorted input or from a reversed polarity input
source. Without the protection diode, a faulted or
shorted input would discharge the battery pack through
the body diode of the external pass transistor.
R
DSON
2002 Microchip Technology Inc.
DSON
V
R
V
I
R
OUT
GS
D SON
INMIN
SENSE
at the worst case V
=
=
is the maximum peak fast charge current
1.6V
EXTERNAL CAPACITORS
REVERSE BLOCKING PROTECTION
4.5V 758mA
------------------------------------------------------------------------------- -
is the minimum input voltage source
=
is the sense resistor
V
--------------------------------------------------------------------------------------------- -
GS
INMIN
–
–
4.5V 758mA
with a 5V, +/-10% input voltage
GS
–
758mA
–
I
, the R
PEAK
GS
BAT
99m
m
I
is:
OU T
, and capacitance of the
pin to GND. This capac-
DSON
R
SENSE
–
99m
4.242V
of the MOSFET
–
V
=
BATMAX
=
–
242m
2.8
V
If a reverse protection diode is incorporated in the
design, it should be chosen to handle the peak fast
charge current continuously at the maximum ambient
temperature. In addition, the reverse leakage current of
the diode should be kept as small as possible.
6.1.1.5
In the stand-alone configuration, the shutdown pin is
generally tied to the input voltage. The MCP73828 will
automatically enter a low power mode when the input
voltage is less than the output voltage reducing the bat-
tery drain current to 10 µA, typically.
By connecting the shutdown pin as depicted in
Figure 6-1, the battery drain current may be further
reduced. In this application, the battery drain current
becomes a function of the reverse leakage current of
the reverse protection diode.
6.1.1.6
As discussed in Section 5.1.1, the MCP73828 can
monitor a temperature range for –0.5°C to 44.2°C. This
temperature range can be expanded or shifted by plac-
ing fixed value resistors in series/parallel combinations
with the thermistor (see Figure 6-1). Given that the
nominal output current of the THERM pin is 25 µA, the
resistor values must satisfy the following equations:
Where:
For example, by utilizing a 931
the typical NTC thermistor described previously, the
monitored temperature window will shift to 0°C to
+50°C, typically. Again, with the same thermistor, a
1 k
produce a monitored window of -5°C to +50°C, typi-
cally.
R
R
R
at the upper temperature of interest
R
at the lower temperature of interest.
series resistor and a 140 k
R
S
P
THERMISTOR-H
THERMISTOR-C
R
S
S
is the fixed series resistance
is the fixed parallel resistance
+
+
------------------------------------------------------- -
R
R
SHUTDOWN INTERFACE
CELL TEMPERATURE MONITOR
R
------------------------------------------------------- -
R
P
P
P
P
+
+
R
R
R
R
THERMISTOR C
THER MISTOR C
TH ERMISTO R H
THERMISTOR H
is the NTC thermistor resistance
is the NTC thermistor resistance
MCP73828
–
–
–
–
=
resistor in series with
=
parallel resistor will
33560
4520
DS21706A-page 13
typ
typ