- 您現(xiàn)在的位置：買(mǎi)賣(mài)IC網(wǎng) > PDF目錄383883 > TC1268-2.5VOA (Microchip Technology Inc.) 500mA Fixed Output, Fast Response CMOS LDO with Shutdown PDF資料下載
參數(shù)資料
| 型號(hào)： | TC1268-2.5VOA |
| 廠(chǎng)商： | Microchip Technology Inc. |
| 英文描述： | 500mA Fixed Output, Fast Response CMOS LDO with Shutdown |
| 中文描述： | 500mA的固定輸出，快速響應(yīng)的CMOS LDO穩(wěn)壓器，帶有關(guān)斷 |
| 文件頁(yè)數(shù)： | 6/12頁(yè) |
| 文件大?。?/td> | 448K |
| 代理商： | TC1268-2.5VOA |
TC1268
DS21379B-page 6
2002 Microchip Technology Inc.
4.0
THERMAL CONSIDERATIONS
4.1
Thermal Shutdown
Integrated
regulator off when die temperature exceeds 160°C.
The regulator remains off until the die temperature
drops to approximately 150°C.
thermal
protection
circuitry
shuts
the
4.2
Power Dissipation
The amount of power the regulator dissipates is
primarily a function of input and output voltage, and
output current. The following equation is used to
calculate worst case actual power dissipation:
EQUATION 4-1:
The
(Equation 4-2) is a function of the maximum ambient
temperature (T
A
MAX
), the maximum allowable die
temperature (T
J
MAX
) and the thermal resistance from
junction-to-air (
θ
JA
).
maximum
allowable
power
dissipation
EQUATION 4-2:
Table 4-1 shows various values of
θ
JA
for the TC1268
package.
TABLE 4-1:
THERMAL RESISTANCE
GUIDELINES FOR TC1268 IN
8-PIN SOIC PACKAGE
*Pin 2 is ground. Device is mounted on topside.
Equation 4-1
Equation 4-2 to ensure regulator thermal operation is
within limits. For example:
can
be
used
in
conjunction
with
Given:
V
IN
MAX
V
OUT
MIN
I
LOAD
MAX
= 275mA
T
J
MAX
T
A
MAX
θ
JA
Find: 1. Actual power dissipation
2. Maximum allowable dissipation
= 3.3V ± 10%
= 2.5V ± 0.5%
= 125°C
= 95°C
= 60°C/W
Actual power dissipation:
P
D
≈
(V
IN
MAX
– V
OUT
MIN
)I
LOAD
MAX
= [(3.3 x 1.1) – (2.5 x .995)]275 x 10
-3
= 314mW
Maximum allowable power dissipation:
P
D
MAX
= (T
J
MAX
– T
A
MAX
)
θ
JA
= (125 – 95)
60
= 500mW
In this example, the TC1268 dissipates a maximum of
314mW; below the allowable limit of 500mW. In a
similar manner, Equation 4-1 and Equation 4-2 can be
used to calculate maximum current and/or input
voltage limits. For example, the maximum allowable
V
IN
is found by substituting the maximum allowable
power dissipation of 500mW into Equation 4-1, from
which V
IN
MAX
= 3.94V.
Copper
Area
(Topside)*
Copper
Area
(Backside)
Board
Area
Thermal
Resistance
(θ
JA
)
60°C/W
60°C/W
68°C/W
74°C/W
2500 sq mm
1000 sq mm
225 sq mm
100 sq mm
2500 sq mm
2500 sq mm
2500 sq mm
2500 sq mm
2500 sq mm
2500 sq mm
2500 sq mm
2500 sq mm
Where:
P
D
≈
(V
IN
MAX
– V
OUT
MIN
)I
LOAD
MAX
P
D
V
IN
MAX
V
OUT
MIN
I
LOAD
MAX
= Worst case actual power dissipation
= Maximum voltage on V
IN
= Minimum regulator output voltage
= Maximum output (load) current
P
D
MAX
= (T
J
MAX
– T
A
MAX
)
θ
JA
Where all terms are previously defined.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| TC1269 | 300mA CMOS LDO with Shutdown and VREF Bypass |
| TC1269-25VUA | 300mA CMOS LDO with Shutdown and VREF Bypass |
| TC1269-30VUA | 300mA CMOS LDO with Shutdown and VREF Bypass |
| TC1269-50VUA | 300mA CMOS LDO with Shutdown and VREF Bypass |
| TC1269-33VUA | 300mA CMOS LDO with Shutdown and VREF Bypass |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TC1269 | 制造商:MICROCHIP 制造商全稱(chēng):Microchip Technology 功能描述:300mA CMOS LDO with Shutdown and VREF Bypass |
| TC1269_13 | 制造商:MICROCHIP 制造商全稱(chēng):Microchip Technology 功能描述:300mA CMOS LDO with Shutdown and VREF Bypass |
| TC1269-2.5VUA | 功能描述:低壓差穩(wěn)壓器 - LDO 300mA LDO w/Shdn RoHS:否 制造商:Texas Instruments 最大輸入電壓:36 V 輸出電壓:1.4 V to 20.5 V 回動(dòng)電壓（最大值）:307 mV 輸出電流:1 A 負(fù)載調(diào)節(jié):0.3 % 輸出端數(shù)量: 輸出類(lèi)型:Fixed 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-20 |
| TC1269-2.5VUATR | 功能描述:低壓差穩(wěn)壓器 - LDO 300mA Adj LDO RoHS:否 制造商:Texas Instruments 最大輸入電壓:36 V 輸出電壓:1.4 V to 20.5 V 回動(dòng)電壓（最大值）:307 mV 輸出電流:1 A 負(fù)載調(diào)節(jié):0.3 % 輸出端數(shù)量: 輸出類(lèi)型:Fixed 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-20 |
| TC1269-2.8VUA | 功能描述:低壓差穩(wěn)壓器 - LDO 300mA Adj LDO RoHS:否 制造商:Texas Instruments 最大輸入電壓:36 V 輸出電壓:1.4 V to 20.5 V 回動(dòng)電壓（最大值）:307 mV 輸出電流:1 A 負(fù)載調(diào)節(jié):0.3 % 輸出端數(shù)量: 輸出類(lèi)型:Fixed 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-20 |
發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。