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參數(shù)資料
| 型號： | MCP73842 |
| 廠商： | Microchip Technology Inc. |
| 元件分類： | FPGA |
| 英文描述： | FPGA - 200000 SYSTEM GATE 2.5 VOLT - NOT RECOMMENDED for NEW DESIGN |
| 中文描述： | 先進(jìn)的單節(jié)或雙節(jié)鋰離子/鋰聚合物充電管理控制器 |
| 文件頁數(shù)： | 17/24頁 |
| 文件大?。?/td> | 414K |
| 代理商： | MCP73842 |
2004 Microchip Technology Inc.
DS21823B-page 17
MCP73841/2/3/4
Worst-case V
GS
with a 5V, ±10% input voltage source
and a maximum sink voltage of 1.0V is:
At this worst-case (V
GS
) the R
DSON
of the MOSFET
must be low enough as to not impede the performance
of the charging system. The maximum allowable
R
DSON
at the worst-case V
GS
is:
The Fairchild NDS8434 and International Rectifier
IRF7404 both satisfy these requirements.
6.1.1.3
EXTERNAL CAPACITORS
The MCP7384X are 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
BAT
pin to V
SS
.
This capacitance provides compensation when there is
no battery load. Additionally, 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 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 ESR
(Effective Series Resistance) value. The actual value of
the capacitor and its associated ESR depends on the
forward transconductance (g
m
) and capacitance of the
external pass transistor. A 4.7 μF tantalum or
aluminum electrolytic capacitor at the output is usually
sufficient to ensure stability for up to a 1A output
current.
6.1.1.4
REVERSE-BLOCKING PROTECTION
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.
If a reverse-protection diode is incorporated into the
design, it should be chosen to handle the 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
ENABLE INTERFACE
In the stand-alone configuration, the enable pin is
generally tied to the input voltage. The MCP7384X
automatically enters a Low-power mode when voltage
on the V
DD
input falls below the undervoltage lockout
voltage (V
STOP
), reducing the battery drain current to
0.4 μA, typically.
6.1.1.6
CHARGE STATUS INTERFACE
A status output provides information on the state of
charge. The current-limited, open-drain output can be
used to illuminate an external LED. Refer to Table 5-1
for a summary of the state of the status output during a
charge cycle.
6.2
PCB Layout Issues
For optimum voltage regulation, place the battery pack
as close as possible to the device’s V
BAT
and V
SS
pins.
This is recommended to minimize voltage drops along
the high current-carrying PCB traces.
If the PCB layout is used as a heatsink, adding many
vias around the external pass transistor can help
conduct more heat to the back plane of the PCB, thus
reducing the maximum junction temperature.
V
GS
1.0
V
4.5
V
120
mV
–
(
)
–
3.38
V
–
=
=
R
DSON
V
---------------------–
V
I
REGMAX
V
BATMAX
–
=
R
DSON
V
4.5
120 115
551 581
)
mV
)
mA
–
4.221
V
–
288
m
=
=
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