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| 型号： | LT3461ES6#TR |
| 厂商： | Linear Technology |
| 文件页数： | 6/8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： | 1.3MHz |
| 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
Inductor Selection
The inductors used with the LT3461/LT3461A should
have a saturation current rating of 0.3A or greater. If the
device is used in an application where the input supply will
be hot-plugged, then the saturation current rating should
be equal to or greater than the peak inrush current. For the
LT3461, an inductor value between 10 μ H and 47 μ H,
depending upon output voltage, will usually be the best
choice for most designs. For the LT3461A, inductor values
between 4.7 μ H and 15 μ H inductor will suffice for most
applications. For best loop stability results, the inductor
value selected should provide a ripple current of 70mA or
more. For a given V IN and V OUT the inductor value to use
with LT3461A is estimated by the formula:
have a low ESR and maintain capacitance over wide
voltage and temperature range. A 2.2 μ F output capacitor
is sufficient for most applications using the LT3461, while
a 1 μ F capacitor is sufficient for most applications using
the LT3461A. High output voltages typically require less
capacitance for loop stability. Always use a capacitor with
sufficient voltage rating.
Either ceramic or solid tantalum capacitors may be used
for the input decoupling capacitor, which should be placed
as close as possible to the LT3461/LT3461A. A 1 μ F
capacitor is sufficient for most applications.
Phase Lead Capacitor
A small value capacitor can be added across resistor R1
L (in microhenries) =
D ? V IN ? V OUT ? 1sec
1 A ? 1 V
between the output and the FB pin to reduce output
perturbation due to a load step and to improve transient
response. This phase lead capacitor introduces a pole-
V OUT + 1V – V IN
where D =
V OUT + 1 V
Use twice this value for the LT3461.
zero pair to the feedback that boosts phase margin near
the cross-over frequency. The following formula is useful
to estimate the capacitor value needed:
Capacitor Selection
Low ESR capacitors should be used at the output to
C PL =
500k ?
R 2
? 1 pF
minimize the output voltage ripple. Multilayer ceramic
capacitors using X5R/X7R dielectrics are preferred as they
TYPICAL APPLICATIO S
L1
For an application running 50 μ A in the feedback divider,
capacitor values from 10pF to 22pF work well.
V IN
10 μ H
Input Current and Output Voltage
5V
C1
1 μ F
CONTROL
SIGNAL
47k
47nF
6
4
1
SW
V IN V OUT
LT3461A
SHDN FB
GND
2
5
3
R1
261k
R2
30.1k
15pF
V OUT
12V
70mA
C2
1 μ F
CONTROL
SIGNAL
5V/DIV
I IN
50mA/DIV
C1, C2: TAIYO YUDEN EMK212BJ105
L1: MURATA LQH32CN100K53
3461a TA02a
V OUT
5V/DIV
Figure 4. 5V to 12V with Soft-Start Circuit (LT3461A)
1ms/DIV
3461a TA02b
3461af
6
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LT3461ES6TRMPBF | 制造商:Linear Technology 功能描述:DC-DC Converter Step-Up 2.5-16V TSOT23-6 |
| LT3462 | 制造商:LINER 制造商全称:Linear Technology 功能描述:Inverting 1.2MHz/2.7MHz DC/DC Converters with Integrated Schottky in ThinSOT |
| LT3462A | 制造商:LINER 制造商全称:Linear Technology 功能描述:Inverting 1.2MHz/2.7MHz DC/DC Converters with Integrated Schottky in ThinSOT |
| LT3462AES6 | 制造商:Linear Technology 功能描述:Conv DC-DC Single Inv 2.5V to 16V 6-Pin TSOT-23 制造商:Linear Technology 功能描述:0.42 A SWITCHING REGULATOR, 3500 kHz SWITCHING FREQ-MAX, PDSO6 |
| LT3462AES6#PBF | 制造商:Linear Technology 功能描述:DC-DC CONVERTER, INVERTING, ADJ, 2.7MHZ, TSOT-23-6, Primary Input Voltage:16V, No. of Outputs:1, No. of Pins:6, Operating Temperature Min:-40C, Operating Temperature Max:85C, MSL:MSL 1 - Unlimited, Package / Case:6-TSOT-23 , RoHS Compliant: Yes 制造商:Linear Technology 功能描述:SP-SWREG/Monolithic, Cut Tape 300mA, Inverting 2.7MHz DC/DC Converter |
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