参数资料
| 型号： | LT1521IST-5#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 8/16页 |
| 文件大小： | 0K |
| 描述： | IC REG LDO 5V .3A SOT223-3 |
| 产品培训模块： | More Information on LDOs |
| 标准包装： | 78 |
| 稳压器拓扑结构： | 正，固定式 |
| 输出电压： | 5V |
| 输入电压： | 最高 20V |
| 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： | -40°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： | 管件 |
| 产品目录页面： | 1327 (CN2011-ZH PDF) |
LT1521/LT1521-3
LT1521-3.3/LT1521-5
TYPICAL PERFOR M A N CE CHARACTERISTICS
100
Ripple Rejection
0
Load Regulation
90
80
70
I LOAD = 150mA
V IN = 6V + 50mV RMS RIPPLE
–5
–10
? I LOAD = 1mA TO 300mA
LT1521-5
60
50
C OUT = 33 μ F
SOLID TANTALUM
–15
–20
L T1521*
LT1521-3
LT1521-3.3
40
30
–25
–30
20
10
C OUT = 3.3 μ F
SOLID TANTALUM
–35
V IN = V OUT (NOMINAL + 1V)
*V ADJ = V OUT
0
10
100
1k 10k
100k
1M
–40
–50 –25
0
25
50
75
100
125
FREQUENCY (Hz)
LT1521-5
Transient Response
LT1521 ? TPC31
TEMPERATURE ( ° C)
LT1521-5
Transient Response
LT1521 ? TPC32
0.2
0.1
0
–0.1
–0.2
150
100
50
0
V IN = 6V
C IN = 0.1 μ F
C OUT = 1.5 μ F
50 100 150 200 250 300 350 400 450 500
TIME ( μ s)
LT1521 ? TPC33
0.2
0.1
0
–0.1
–0.2
300
200
100
V IN = 6V
C IN = 0.1 μ F
C OUT = 33 μ F
0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0
TIME (ms)
LT1521 ? TPC34
PI N FU N CTIO N S
OUT (Pin 1): The output pin supplies power to the load. A
minimum output capacitor of 1.5 μ F is required to prevent
oscillations, but larger values of output capacitor will be
necessary to deal with larger load transients. See the
Applications Information section for more on output
capacitance and reverse output characteristics.
SENSE (Pin 2): For fixed voltage versions of the LT1521
(LT1521-3, LT1521-3.3, LT1521-5), the sense pin is the
input to the error amplifier. Optimum regulation will be
obtained at the point where the sense pin is connected to
the output pin of the regulator. In critical applications small
voltage drops caused by the resistance (R P ) of PC traces
between the regulator and the load, which would normally
degrade regulation, may be eliminated by connecting the
sense pin to the output at the load as shown in Figure 1
(Kelvin Sense Connection). Note that the voltage drop
across the external PC traces will add to the dropout
voltage of the regulator. The sense pin bias current is 5 μ A
at the nominal regulated output voltage. This pin is inter-
nally clamped to – 0.6V (one V BE ).
1521335fb
8
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