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参数资料
| 型号： | LT3494EDDB#TRMPBF |
| 厂商： | Linear Technology |
| 文件页数： | 7/12页 |
| 文件大小： | 0K |
| 描述： | IC REG BOOST ADJ 0.18A 8DFN |
| 标准包装： | 1 |
| 类型： | 升压（升压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 1.23 V ~ 38 V |
| 输入电压： | 2.3 V ~ 16 V |
| PWM 型： | 混合物 |
| 电流 - 输出： | 180mA |
| 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-WFDFN 裸露焊盘 |
| 包装： | 标准包装 |
| 供应商设备封装： | 8-DFN（3x2） |
| 产品目录页面： | 1331 (CN2011-ZH PDF) |
| 其它名称： | LT3494EDDB#TRMPBFDKR |
LT3494/LT3494A
OPERATION
The LT3494/LT3494A use a novel control scheme to pro-
vide high ef?ciency over a wide range of output current.
In addition, this technique keeps the switching frequency
above the audio band over all load conditions.
The operation of the part can be better understood by
refering to the Block Diagram. The part senses the output
voltage by monitoring the voltage on the FB pin. The user
sets the desired output voltage by choosing the value of
the external top feedback resistor. The parts incorporate
a precision 182k bottom feedback resistor. Assuming that
output voltage adjustment is not used (CTRL pin is tied to
1.5V or greater), the internal reference (V REF = 1.225V) sets
the voltage at which FB will servo to during regulation.
The Switch Control block senses the output of the ampli-
?er and adjusts the switching frequency as well as other
parameters to achieve regulation. During the start-up of
the circuit, special precautions are taken to insure that the
inductor current remains under control.
APPLICATIONS INFORMATION
Choosing an Inductor
Several recommended inductors that work well with the
LT3494/LT3494A are listed in Table 1, although there are
many other manufacturers and devices that can be used.
Consult each manufacturer for more detailed information
and for their entire selection of related parts. Many dif-
ferent sizes and shapes are available. Use the equations
and recommendations in the next few sections to ?nd the
correct inductance value for your design.
Inductor Selection—Boost Regulator
The formula below calculates the appropriate inductor
value to be used for a boost regulator using the LT3494/
LT3494A (or at least provides a good starting point).
Table 1. Recommended Inductors
Because the switching frequency is never allowed to fall
below approximately 50kHz, a minimum load must be
present to prevent the output voltage from drifting too high.
This minimum load is automatically generated within the
part via the Shunt Control block. The level of this current
is adaptable, removing itself when not needed to improve
ef?ciency at higher load levels.
The LT3494/LT3494A also have an integrated Schottky
diode and PMOS output disconnect switch. The PMOS
switch is turned on when the part is enabled via the SHDN
pin. When the parts are in shutdown, the PMOS switch
turns off, allowing the V OUT node to go to ground. This
type of disconnect function is often required in power
supplies.
The only difference between the LT3494A and LT3494
is the level of the current limit. The LT3494A has a typi-
cal peak current limit of 350mA while the LT3494 has a
180mA limit.
This value provides a good trade off in inductor size and
system performance. Pick a standard inductor close to
this value. A larger value can be used to slightly increase
the available output current, but limit it to around twice
the value calculated below, as too large of an inductance
will decrease the output voltage ripple without providing
much additional output current. A smaller value can be
used (especially for systems with output voltages greater
than 12V) to give a smaller physical size. Inductance can
be calculated as:
L = (V OUT – V IN(MIN) + 0.5V) ? 0.66 (μH)
where V OUT is the desired output voltage and V IN(MIN) is
the minimum input voltage. Generally, a 10μH or 15μH
inductor is a good choice.
PART
LQH32CN100K53
LQH32CN150K53
CDRH3D11-100
CDHED13/S-150
FOR USE WITH
LT3494/LT3494A
LT3494
LT3494
LT3494/LT3494A
VALUE
(μH)
10
15
10
15
MAX DCR
( Ω )
0.3
0.58
0.24
0.55
MAX DC I
(mA)
450
300
280
550
SIZE
(mm × mm × mm)
3.5 × 2.7 × 1.7
3.5 × 2.7 × 1.7
4.0 × 4.0 × 1.2
4.0 × 4.2 × 1.4
VENDOR
Murata
www.murata.com
Sumida
www.sumida.com
3494fb
7
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相关代理商/技术参数 |
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| LT3495 | 制造商:LINER 制造商全称:Linear Technology 功能描述:650mA/350mA Micropower Low Noise Boost Converter with Output Disconnect |
| LT3495-1 | 制造商:LINER 制造商全称:Linear Technology 功能描述:650mA/350mA Micropower Low Noise Boost Converter with Output Disconnect |
| LT3495B | 制造商:LINER 制造商全称:Linear Technology 功能描述:650mA/350mA Micropower Low Noise Boost Converter with Output Disconnect |
| LT3495B-1 | 制造商:LINER 制造商全称:Linear Technology 功能描述:650mA/350mA Micropower Low Noise Boost Converter with Output Disconnect |
| LT3495BEDDB#TRMPBF | 功能描述:IC REG BOOST ADJ 0.65A 10DFN RoHS:是 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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