参数资料
| 型号： | LT1521CST-3#TR |
| 厂商： | Linear Technology |
| 文件页数： | 10/16页 |
| 文件大小： | 0K |
| 描述： | IC REG LDO 3V .3A SOT223-3 |
| 标准包装： | 2,000 |
| 稳压器拓扑结构： | 正，固定式 |
| 输出电压： | 3V |
| 输入电压： | 4.3 V ~ 20 V |
| 电压 - 压降（标准）： | 0.5V @ 300mA |
| 稳压器数量： | 1 |
| 电流 - 输出： | 300mA |
| 电流 - 限制（最小）： | 320mA |
| 工作温度： | 0°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | TO-261-4，TO-261AA |
| 供应商设备封装： | SOT-223 |
| 包装： | 带卷 (TR) |
LT1521/LT1521-3
LT1521-3.3/LT1521-5
APPLICATIO N S I N FOR M ATIO N
) )
V OUT = 3.75V 1 + R2 + (I ADJ + R2)
IN
V IN
SHDN
R1
V ADJ = 3.75V
I ADJ = 50nA AT 25 ° C
OUTPUT RANGE = 3.75V TO 20V
LT1521
GND
OUT
ADJ
R2
R1
+
V OUT
LT1521 ? F01
The ground pin current can be found by examining the
Ground Pin Current curves in the Typical Performance
Characteristics. Power dissipation will be equal to the sum
of the two components listed above.
The LT1521 series regulators have internal thermal limit-
ing designed to protect the device during overload condi-
tions. For continuous normal load conditions the maxi-
mum junction temperature rating of 125 ° C must not be
exceeded. It is important to give careful consideration to
Figure 2. Adjustable Operation
output is turned off and the divider current will be zero.
Curves of Adjust Pin Voltage vs Temperature and Adjust
Pin Bias Current vs Temperature appear in the Typical
Performance Characteristics. The reference voltage at the
adjust pin has a positive temperature coefficient of ap-
proximately 15ppm/ ° C. The adjust pin bias current has a
negative temperature coefficient. These effects will tend to
cancel each other.
The adjustable device is specified with the adjust pin tied
to the output pin. This sets the output voltage to 3.75V.
Specifications for output voltages greater than 3.75V will
be proportional to the ratio of the desired output voltage
to 3.75V; (V OUT /3.75V). For example: load regulation for
all sources of thermal resistance from junction to ambient.
Additional heat sources mounted nearby must also be
considered.
For surface mount devices, heat sinking is accomplished
by using the heat spreading capabilities of the PC board
and its copper traces. Copper board stiffeners and plated
through-holes can also be used to spread the heat gener-
ated by power devices.
The following tables list thermal resistance for each pack-
age. Measured values of thermal resistance for several
different board sizes and copper areas are listed for each
package. All measurements were taken in still air on
3/32" FR-4 board with one ounce copper. All NC leads were
connected to the ground plane.
an output current change of 1mA to 300mA is –20mV
typical at V OUT = 3.75V. At V OUT = 12V, load regulation
would be:
Table 1. MS8 Package
COPPER AREA
TOPSIDE** BACKSIDE
BOARD AREA
THERMAL RESISTANCE
(JUNCTION-TO-AMBIENT)
1000mm
2500mm
2500mm
(12V/3.75V)(– 20mV) = – 64mV
Thermal Considerations
2500mm 2
2
225mm 2
2500mm 2
2
2500mm 2
2500mm 2
2
2500mm 2
110 ° C/W
115 ° C/W
120 ° C/W
The power handling capability of the device will be limited
by the maximum rated junction temperature (125 ° C). The
power dissipated by the device will be made up of two
components:
100mm 2 2500mm 2 2500mm 2
* Pin 4 is ground. ** Device is mounted on topside.
Table 2. S8 Package*
COPPER AREA
130 ° C/W
THERMAL RESISTANCE
1. Output current multiplied by the input/output voltage
TOPSIDE** BACKSIDE
BOARD AREA (JUNCTION-TO-AMBIENT)
differential: I OUT (V IN – V OUT ), and
2. Ground pin current multiplied by the input voltage:
(I GND )(V IN )
2500mm 2
1000mm 2
225mm 2
100mm 2
2500mm 2
2500mm 2
2500mm 2
2500mm 2
2500mm 2
2500mm 2
2500mm 2
2500mm 2
60 ° C/W
60 ° C/W
68 ° C/W
74 ° C/W
* Pins 3, 6, 7 are ground. ** Device is mounted on topside.
1521335fb
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| LT1521CST5 | 制造商:LT 功能描述:* |
| LT1521CST-5 | 功能描述:IC REG LDO 5V .3A 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 |
| LT1521CST-5#PBF | 功能描述:IC REG LDO 5V .3A 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 |
| LT1521CST-5#TR | 功能描述:IC REG LDO 5V .3A 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 |
| LT1521CST-5#TRPBF | 功能描述:IC REG LDO 5V .3A 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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