参数资料
| 型号： | LT1121IS8#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 10/16页 |
| 文件大小： | 0K |
| 描述： | IC REG LDO ADJ .15A 8-SOIC |
| 产品培训模块： | More Information on LDOs |
| 标准包装： | 100 |
| 稳压器拓扑结构： | 正，可调式 |
| 输出电压： | 3.75 V ~ 30 V |
| 输入电压： | 4.17 V ~ 30 V |
| 电压 - 压降（标准）： | 0.42V @ 150mA |
| 稳压器数量： | 1 |
| 电流 - 输出： | 150mA |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm 宽） |
| 供应商设备封装： | 8-SOIC |
| 包装： | 管件 |
| 产品目录页面： | 1326 (CN2011-ZH PDF) |
LT1121/LT1121-3.3/LT1121-5
APPLICATIONS INFORMATION
NC leads were connected to the ground plane.
Table 5. TO-92 Package THERMAL RESISTANCE
Package alone
220oC/W
Table 1. N8 Package*
COPPER AREA
TOPSIDE BACKSIDE
2500 sq mm 2500 sq mm
1000 sq mm 2500 sq mm
BOARD AREA
2500 sq mm
2500 sq mm
THERMAL RESISTANCE
JUNCTION TO AMBIENT
80oC/W
80oC/W
Package soldered into PC board with plated through
holes only
Package soldered into PC board with 1/4 sq. inch of
copper trace per lead
Package soldered into PC board with plated through
holes in board, no extra copper trace, and a clip-on type
heat sink: Thermalloy type 2224B
175oC/W
145oC/W
160oC/W
225 sq mm
2500 sq mm
2500 sq mm
85oC/W
Aavid type 5754
135oC/W
1000 sq mm 1000 sq mm
1000 sq mm
91oC/W
* Device is mounted on topside. Leads are through hole and are
soldered to both sides of board.
Calculating Junction Temperature
Table 2. S8 Package
COPPER AREA
TOPSIDE* BACKSIDE
2500 sq mm 2500 sq mm
1000 sq mm 2500 sq mm
225 sq mm 2500 sq mm
BOARD AREA
2500 sq mm
2500 sq mm
2500 sq mm
THERMAL RESISTANCE
JUNCTION TO AMBIENT
120oC/W
120oC/W
125oC/W
Example: given an output voltage of 3.3V, an input voltage
range of 4.5V to 7V, an output current range of 0mA to
100mA, and a maximum ambient temperature of 50°C,
what will the maximum junction temperature be?
Power dissipated by the device will be equal to:
I OUT MAX ? ( V IN MAX – V OUT ) + (I GND ? V IN )
100 sq mm 1000 sq mm 1000 sq mm
* Device is mounted on topside.
131oC/W
where, I OUT MAX = 100mA
V IN MAX = 7V
I GND at (I OUT = 100mA, V IN = 7V) = 5mA
THERMAL RESISTANCE
THERMAL RESISTANCE
Table 3. AS8 Package*
COPPER AREA
TOPSIDE** BACKSIDE BOARD AREA JUNCTION TO AMBIENT
2500 sq mm 2500 sq mm 2500 sq mm 60oC/W
1000 sq mm 2500 sq mm 2500 sq mm 60oC/W
225 sq mm 2500 sq mm 2500 sq mm 68oC/W
100 sq mm 2500 sq mm 2500 sq mm 74oC/W
* Pins 3, 6 and 7 are ground.
** Device is mounted on topside.
Table 4. SOT-223 Package
(Thermal Resistance Junction-to-Tab 20oC/W)
COPPER AREA
TOPSIDE* BACKSIDE BOARD AREA JUNCTION TO AMBIENT
2500 sq mm 2500 sq mm 2500 sq mm 50oC/W
so, P = 100mA ? (7 V – 3.3V) + (5mA ? 7 V)
= 0.405W
If we use an SOT-223 package, then the thermal resistance
will be in the range of 50°C/W to 65°C/W depending on
copper area. So the junction temperature rise above ambi-
ent will be less than or equal to:
0.405W ? 60° C/W = 24°C
The maximum junction temperature will then be equal to
the maximum junction temperature rise above ambient
plus the maximum ambient temperature or:
T JMAX = 50°C + 24°C = 74°C
Output Capacitance and Transient Performance
1000 sq mm 2500 sq mm 2500 sq mm
225 sq mm 2500 sq mm 2500 sq mm
100 sq mm 2500 sq mm 2500 sq mm
1000 sq mm 2500 sq mm 1000 sq mm
1000 sq mm 0 1000 sq mm
* Tab of device attached to topside copper.
50oC/W
58oC/W
64oC/W
57oC/W
60oC/W
The LT1121 is designed to be stable with a wide range of
output capacitors. The minimum recommended value is 1μF
with an ESR of 3Ω or less. For applications where space
is very limited, capacitors as low as 0.33μF can be used if
combined with a small series resistor. Assuming that the
ESR of the capacitor is low (ceramic) the suggested series
1121fg
10
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LT1121IST-3.3 | 功能描述:IC REG LDO 3.3V .15A SOT223-3 RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - 线性 系列:- 产品培训模块:More Information on LDOs 标准包装:50 系列:- 稳压器拓扑结构:正，固定式 输出电压:3.3V 输入电压:最高 15V 电压 - 压降（标准）:1.1V @ 800mA 稳压器数量:1 电流 - 输出:800mA 电流 - 限制（最小）:800mA 工作温度:0°C ~ 125°C 安装类型:表面贴装 封装/外壳:TO-263-4，D²Pak（3 引线+接片），TO-263AA 供应商设备封装:D2PAK-3 包装:管件 |
| LT1121IST-3.3#PBF | 功能描述:IC REG LDO 3.3V .15A SOT223-3 RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - 线性 系列:- 标准包装:1 系列:- 稳压器拓扑结构:正，固定式 输出电压:8V 输入电压:10.5 V ~ 23 V 电压 - 压降（标准）:1.7V @ 40mA 稳压器数量:1 电流 - 输出:100mA（最小值） 电流 - 限制（最小）:- 工作温度:0°C ~ 125°C 安装类型:表面贴装 封装/外壳:8-SOIC（0.154"，3.90mm 宽） 供应商设备封装:8-SOIC 包装:剪切带 (CT) 产品目录页面:1075 (CN2011-ZH PDF) 其它名称:296-24390-1 |
| LT1121IST-3.3#PBF | 制造商:Linear Technology 功能描述:IC VOLT REG FIXED +3.3V BIPOLAR SO |
| LT1121IST-3.3#TR | 功能描述:IC REG LDO 3.3V .15A SOT223-3 RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - 线性 系列:- 产品培训模块:More Information on LDOs 标准包装:50 系列:- 稳压器拓扑结构:正，固定式 输出电压:3.3V 输入电压:最高 15V 电压 - 压降（标准）:1.1V @ 800mA 稳压器数量:1 电流 - 输出:800mA 电流 - 限制（最小）:800mA 工作温度:0°C ~ 125°C 安装类型:表面贴装 封装/外壳:TO-263-4，D²Pak（3 引线+接片），TO-263AA 供应商设备封装:D2PAK-3 包装:管件 |
| LT1121IST-3.3#TRPBF | 功能描述:IC REG LDO 3.3V .15A SOT223-3 RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - 线性 系列:- 产品培训模块:More Information on LDOs 标准包装:50 系列:- 稳压器拓扑结构:正，固定式 输出电压:3.3V 输入电压:最高 15V 电压 - 压降（标准）:1.1V @ 800mA 稳压器数量:1 电流 - 输出:800mA 电流 - 限制（最小）:800mA 工作温度:0°C ~ 125°C 安装类型:表面贴装 封装/外壳:TO-263-4，D²Pak（3 引线+接片），TO-263AA 供应商设备封装:D2PAK-3 包装:管件 |
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