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参数资料
| 型号： | REG1117FA/KTTT |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 可调正电压单路输出LDO稳压器 |
| 英文描述： | 1.225 V-1.28 V ADJUSTABLE POSITIVE LDO REGULATOR, 1.55 V DROPOUT, PSSO3 |
| 封装： | PLASTIC, TO-263, D2PAK-3 |
| 文件页数： | 22/22页 |
| 文件大小： | 655K |
| 代理商： | REG1117FA/KTTT |
REG1117
REG1117A
SBVS001D OCTOBER 1992 REVISED JULY 2004
www.ti.com
9
A simple experiment will determine whether the maximum
recommended junction temperature is exceeded in an
actual circuit board and mounting configuration: Increase
the ambient temperature above that expected in normal
operation until the device’s thermal shutdown is activated.
If this occurs at more than 40
°C above the maximum
expected ambient temperature, then TJ will be less than
125
°C during normal operation.
The internal protection circuitry of the REG1117 was
designed to protect against overload conditions. It was not
intended to replace proper heat sinking. Continuously
running the REG1117 into thermal shutdown will degrade
reliability.
LAYOUT CONSIDERATIONS
The DDPAK (REG1117F-3.3 and REG1117FA) is a
surface-mount power package that has excellent thermal
characteristics. For best thermal performance, the
mounting tab should be soldered directly to a circuit board
copper area, as shown in Figure 3. Increasing the copper
area improves heat dissipation. Figure 4 shows typical
thermal resistance from junction-to-ambient as a function
of the copper area.
3Lead DDPAK(1)
NOTE: (1) For improved thermal performance increase
footprint area. See Figure 4 (Thermal Resistance vs
Circuit Board Copper Area).
All measurements
in inches.
0.
4
5
0.085
0.2
0.51
0.10
0.155
0.05
Figure 3. DDPAK Footprint
THERMAL RESISTANCE vs
CIRCUIT BOARD COPPER AREA
60
50
40
30
20
10
01
2
3
45
Copper Area (inches2)
REG1117F
DDPAK Surface Mount Package
1oz copper
Thermal
Resistance,
q
JA
(
°C/W)
Circuit Board Copper Area
REG1117F
DDPAK SurfaceMount Package
Figure 4. DDPAK Thermal Resistance versus Circuit Board Copper Area
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相关代理商/技术参数 |
参数描述 |
|---|---|
| REG1117FAKTTTG3 | 功能描述:低压差稳压器 - LDO 800mA & 1A LDO RoHS:否 制造商:Texas Instruments 最大输入电压:36 V 输出电压:1.4 V to 20.5 V 回动电压（最大值）:307 mV 输出电流:1 A 负载调节:0.3 % 输出端数量: 输出类型:Fixed 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-20 |
| REG1117FA-TR | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Positive Adjustable Voltage Regulator |
| REG1117G4 | 功能描述:低压差稳压器 - LDO 800mA & 1A LDO RoHS:否 制造商:Texas Instruments 最大输入电压:36 V 输出电压:1.4 V to 20.5 V 回动电压（最大值）:307 mV 输出电流:1 A 负载调节:0.3 % 输出端数量: 输出类型:Fixed 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-20 |
| REG1117TR | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Positive Adjustable Voltage Regulator |
| REG1118 | 制造商:BB 制造商全称:BB 功能描述:800mA Low Dropout Positive Regulator with Current Source and Sink Capability |
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