ADM00313 Microchip Technology, ADM00313 Datasheet - Page 18

• Manufacturer Part Number: ADM00313
• Description: Power Management IC Development Tools 73830L Li-Ion Battry Charger Eval Brd
• Manufacturer: Microchip Technology

Specifications of ADM00313

• Rohs: yes

MCP73830/L
Power dissipation with a 5V, ±10% input voltage
source, 200 mA ±10%, and preconditioning threshold
voltage at 6V is:
EQUATION 6-2:
This power dissipation with the battery charger in the
2x2 TDFN-6 package will result in a temperature of
approximately 33C above room temperature.
6.1.1.3
The MCP73830 is stable with or without a battery load.
In order to maintain good AC stability in Constant Volt-
age mode, a minimum capacitance of 1 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 mode. Therefore, the bypass capaci-
tance may be necessary to compensate for the
inductive nature of the battery pack.
A minimum of 16V rated 1 µF is recommended to apply
for output capacitor, and a minimum of 25V rated 1 µF
is recommended to apply for input capacitor for typical
applications.
TABLE 6-1:
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 out-
put load current. A 1 µF ceramic, tantalum or aluminum
electrolytic capacitor at the output is usually sufficient
to ensure stability.
6.1.1.4
The MCP73830/L 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.
DS25049B-page 18
PowerDissipation
Capacitors
MLCC
X7R
X5R
External Capacitors
Reverse-Blocking Protection
-55C to + 125C
-55C to + 85C
Temperature
MLCC CAPACITOR EXAMPLE
=
Range

5.5V 3.0V
–
BAT


220mA
pin to V
Tolerance
±15%
±15%
=
SS
0.55W
. This
·
6.2
For optimum voltage regulation, place the battery pack
as close as possible to the device’s V
which is recommended to minimize voltage drops
along the high current carrying PCB traces.
If the PCB layout is used as a heat sink, adding many
vias in the heat sink pad can help conduct more heat to
the backplane of the PCB, thus reducing the maximum
junction temperature.
a typical layout with PCB heat sinking.
FIGURE 6-3:
FIGURE 6-4:
PCB Layout Issues
Figure 6-4
Typical Layout (Top).
Typical Layout (Top Metal).
 2011 Microchip Technology Inc.
and
BAT
Figure 6-5
and V
SS
depict
pins,