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參數(shù)資料
| 型號： | LT1054MH |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | Switched-Capacitor Voltage Converter with Regulator |
| 中文描述： | SWITCHED CAPACITOR REGULATOR, 25 kHz SWITCHING FREQ-MAX, MBCY8 |
| 封裝： | METAL CAN, TO-5, 8 PIN |
| 文件頁數(shù)： | 13/26頁 |
| 文件大?。?/td> | 444K |
| 代理商： | LT1054MH |
SLVS033F FEBRUARY 1990 REVISED NOVEMBER 2004
13
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
APPLICATION INFORMATION
power dissipation
The power dissipation of any LT1054 circuit must be limited so that the junction temperature of the device does
not exceed the maximum junction-temperature ratings. The total power dissipation is calculated from two
components–the power loss due to voltage drops in the switches, and the power loss due to drive-current
losses. The total power dissipated by the LT1054 is calculated as:
P
V
CC
V
OUT
I
OUT
V
CC
I
OUT
(0.2)
where both V
CC
and V
OUT
are referenced to ground. The power dissipation is equivalent to that of a linear
regulator. Limited power-handling capability of the LT1054 packages causes limited output-current
requirements, or steps can be taken to dissipate power external to the LT1054 for large input or output
differentials. This is accomplished by placing a resistor in series with C
IN
as shown in Figure 17. A portion of
the input voltage is dropped across this resistor without affecting the output regulation. Since switch current is
approximately 2.2 times the output current and the resistor causes a voltage drop when C
IN
is both charging
and discharging, the resistor chosen is as shown:
R
X
V
X
4.4 I
OUT
Where:
V
X
≈
V
CC
[(LT1054 voltage loss)(1.3) + |V
OUT
|]
and
I
OUT
= maximum required output current
The factor of 1.3 allows some operating margin for the LT1054.
When using a 12-V to 5-V converter at 100-mA output current, calculate the power dissipation without an
external resistor.
P
P
(12 V
700 mW
|
5 V|)(100 mA)
240 mW
(12 V)(100 mA)(0.2)
940 mW
VIN
COUT
R2
R1
C1
LT1054
VOUT
VREF
OSC
VCC
CAP
GND
CAP+
FB/SD
VOUT
Rx
CIN
Pin numbers shown are for the P package.
+
+
1
2
3
4
8
7
6
5
Figure 17. Power-Dissipation-Limiting Resistor in Series With C
IN
(7)
(8)
(9)
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