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參數(shù)資料
| 型號： | LTC4085EDE-3#TRPBF |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 電源管理 |
| 英文描述： | POWER SUPPLY MANAGEMENT CKT, PDSO14 |
| 封裝： | 4 X 3 MM, PLASTIC, MO-229, DFN-14 |
| 文件頁數(shù)： | 14/24頁 |
| 文件大?。?/td> | 275K |
| 代理商： | LTC4085EDE-3#TRPBF |
LTC4085-3
21
40853f
The nal solution is shown in Figure 4, where
RNOM = 124k, R1 = 24.3k and RNTC = 100k at 25°C
Using the WALL Pin to Detect the Presence of a Wall
Adapter
The WALL input pin identies the presence of a wall
adapter (the pin should be tied directly to the adapter
output voltage). This information is used to disconnect the
input pin, IN, from the OUT pin in order to prevent back
conduction to whatever may be connected to the input.
It also forces the ACPR pin low when the voltage at the
WALL pin exceeds the input threshold. In order for the
presence of a wall adapter to be acknowledged, both of
the following conditions must be satised:
1. The WALL pin voltage exceeds VWAR (approximately
4.25V); and
2. The WALL pin voltage exceeds VWDR (approximately
75mV above VBAT)
The input power path (between IN and OUT) is re-enabled
and the ACPR pin assumes a high impedance state when
either of the following conditions is met:
1. The WALL pin voltage falls below VWDF (approximately
25mV above VBAT); or
2. The WALL pin voltage falls below VWAF (approximately
3.12V)
Each of these thresholds is suitably ltered in time to
prevent transient glitches on the WALL pin from falsely
triggering an event.
Power Dissipation
The conditions that cause the LTC4085-3 to reduce charge
current due to the thermal protection feedback can be
approximated by considering the power dissipated in the
part. For high charge currents and a wall adapter applied to
VOUT, the LTC4085-3 power dissipation is approximately:
PD = (VOUT – VBAT) IBAT
Where, PD is the power dissipated, VOUT is the supply
voltage, VBAT is the battery voltage, and IBAT is the battery
charge current. It is not necessary to perform any worst-
case power dissipation scenarios because the LTC4085-3
will automatically reduce the charge current to maintain
the die temperature at approximately 105°C. However, the
approximate ambient temperature at which the thermal
feedback begins to protect the IC is:
TA = 105°C – PD θJA
TA = 105°C – (VOUT – VBAT) IBAT θJA
Example: Consider an LTC4085-3 operating from a wall
adapter with 5V at VOUTproviding0.8Atoa3VLi-Ionbattery.
The ambient temperature above which the LTC4085-3 will
begin to reduce the 0.8A charge current, is approximately
TA = 105°C – (5V – 3V) 0.8A 43°C/W
TA = 105°C – 1.6W 43°C/W = 105°C – 69°C = 36°C
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