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| 型号： | LT3461AES6#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 5/8页 |
| 文件大小： | 0K |
| 描述： | IC REG BOOST ADJ 0.25A TSOT23-6 |
| 标准包装： | 2,500 |
| 类型： | 升压（升压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 1.26 V ~ 38 V |
| 输入电压： | 2.5 V ~ 16 V |
| PWM 型： | 电流模式 |
| 频率 - 开关： | 3MHz |
| 电流 - 输出： | 250mA |
| 同步整流器： | 无 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | SOT-23-6 细型，TSOT-23-6 |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | TSOT-23-6 |
LT3461/LT3461A
APPLICATIO S I FOR ATIO
Inrush Current
The LT3461 has a built-in Schottky diode. When supply
numbers can be expected if the LT3461 is supplied from a
separate low voltage rail.
voltage is applied to the V IN pin, the voltage difference
between V IN and V OUT generates inrush current flowing
from input through the inductor and the Schottky diode to
160
120
V IN = 5V
V IN = 8V
V IN = 12V
charge the output capacitor. The maximum nonrepetitive
surge current the Schottky diode in the LT3461 can
sustain is 1.5A. The selection of inductor and capacitor
value should ensure the peak of the inrush current to be
below 1.5A. In addition, turn-on of the LT3461 should be
delayed until the inrush current is less than the maximum
80
40
V IN >15V
current limit. The peak inrush current can be calculated as
follows:
0
6
14
22
V OUT (V)
30
38
?
I P = IN
? exp ? ?
?
V IN = 8V
?
V – 0.6
L ?
– 1 2
C ?
π
L
C
?
?
?
?
? 1 ?
?
3461 F01a
Figure 3a. LT3461 Operating Region
160
V IN = 5V
120
where L is the inductance, r is the resistance of the
inductor and C is the output capacitance.
Table 3 gives inrush peak currents for some component
selections.
Table 3. Inrush Peak Current
80
40
V IN = 12V
V IN >15V
V IN (V)
5
5
L ( μ H)
4.7
10
C ( μ F)
1
1
I P (A)
1.1
0.9
0
6
14
22
V OUT (V)
30
38
3461 F01b
Figure 3b. LT3461A Operating Region
Thermal Considerations
Significant power dissipation can occur on the LT3461
and LT3461A, particularly at high input voltage. Device
load, voltage drops in the power path components, and
switching losses are the major contributors. It is impor-
tant to measure device power dissipation in an application
to ensure that the LT3461 does not exceed the absolute
maximum operating junction temperature of 125 ° C over
the operating ambient temperature range. Generally, for
supply voltages below 5V the integrated current limit
function provides adequate protection for nonfault condi-
tions. For supply voltages above 5V, Figures 3a and 3b
show the recommended operating region of the LT3461
Switching Frequency
The key difference between the LT3461 and LT3461A is the
faster switching frequency of the LT3461A. At 3MHz, the
LT3461A switches at twice the rate of the LT3461. The
higher switching frequency of the LT3461A allows physi-
cally smaller inductors and capacitors to be used in a given
application, but with a slight decrease in efficiency and
maximum output current when compared to the LT3461.
Generally if efficiency and maximum output current are
crucial, or a high output voltage is being generated, the
LT3461 should be used. If application size and cost are
more important, the LT3461A will be the better choice.
and LT3461A, respectively. These graphs are based
on 250mW on-chip dissipation. Improvement of these
3461af
5
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相关代理商/技术参数 |
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| LT3461ES6 | 制造商:Linear Technology 功能描述: 制造商:Linear Technology 功能描述:Conv DC-DC Single Step Up 2.5V to 16V 6-Pin TSOT-23 |
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| LT3461ES6#TRM | 功能描述:IC REG BOOST ADJ 0.25A TSOT23-6 RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 标准包装:2,500 系列:- 类型:升压（升压） 输出类型:可调式 输出数:1 输出电压:1.24 V ~ 30 V 输入电压:1.5 V ~ 12 V PWM 型:电流模式，混合 频率 - 开关:600kHz 电流 - 输出:500mA 同步整流器:无 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:8-SOIC（0.154"，3.90mm 宽） 包装:带卷 (TR) 供应商设备封装:8-SOIC |
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