参数资料
| 型号： | LT3085MPMS8E#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 8/28页 |
| 文件大小： | 0K |
| 描述： | IC REG LDO ADJ .5A 8-MSOP |
| 产品培训模块： | More Information on LDOs |
| 标准包装： | 2,500 |
| 稳压器拓扑结构： | 正，可调式 |
| 输出电压： | 可调 |
| 输入电压： | 1.2 V ~ 36 V |
| 电压 - 压降（标准）： | 1.35V @ 500mA |
| 稳压器数量： | 1 |
| 电流 - 输出： | 500mA |
| 电流 - 限制（最小）： | 500mA |
| 工作温度： | -55°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-TSSOP，8-MSOP（0.118"，3.00mm 宽）裸露焊盘 |
| 供应商设备封装： | 8-MSOP-EP |
| 包装： | 带卷 (TR) |
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LT3085
BLOCK DIAGRAM
IN
V CONTROL
10μA
+
–
3085 BD
SET
APPLICATIONS INFORMATION
The LT3085 regulator is easy to use and has all the pro-
tection features expected in high performance regulators.
Included are short-circuit protection and safe operating
area protection, as well as thermal shutdown.
The LT3085 is especially well suited to applications needing
multiple rails. The new architecture adjusts down to zero
with a single resistor, handling modern low voltage digital
IC’s as well as allowing easy parallel operation and thermal
management without heat sinks. Adjusting to “zero” output
allows shutting off the powered circuitry and when the
input is pre-regulated – such as a 5V or 3.3V input supply
– external resistors can help spread the heat.
A precision “0” TC 10μA internal current source is connected
to the non-inverting input of a power operational ampli?er.
The power operational ampli?er provides a low impedance
buffered output to the voltage on the non-inverting input.
A single resistor from the non-inverting input to ground
sets the output voltage and if this resistor is set to zero,
zero output results. As can be seen, any output voltage
can be obtained from zero up to the maximum de?ned by
the input power supply.
OUT
What is not so obvious from this architecture are the ben-
e?ts of using a true internal current source as the reference
as opposed to a bootstrapped reference in older regulators.
A true current source allows the regulator to have gain
and frequency response independent of the impedance on
the positive input. Older adjustable regulators, such as the
LT1086, have a change in loop gain with output voltage
as well as bandwidth changes when the adjustment pin
is bypassed to ground. For the LT3085, the loop gain is
unchanged by changing the output voltage or bypassing.
Output regulation is not ?xed at a percentage of the output
voltage but is a ?xed fraction of millivolts. Use of a true
current source allows all the gain in the buffer ampli?er
to provide regulation and none of that gain is needed to
amplify up the reference to a higher output voltage.
The LT3085 has the collector of the output transistor
connected to a separate pin from the control input. Since the
dropout on the collector (IN pin) is only 275mV, two supplies
can be used to power the LT3085 to reduce dissipation: a
higher voltage supply for the control circuitry and a lower
voltage supply for the collector. This increases ef?ciency and
reduces dissipation. To further spread the heat, a resistor
can be inserted in series with the collector to move some
of the heat out of the IC and spread it on the PC board.
3085fb
8
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LT3090EDD#PBF | 制造商:Linear Technology 功能描述:IC REG LDO NEG ADJ 0.6A 10DFN 制造商:Linear Technology 功能描述:IC, LINEAR VOLT REG, -36V, DFN-10 制造商:Linear Technology 功能描述:LDO, ADJ, 0V-32V, 600MA, DFN-10, Primary Input Voltage:-36V, Dropout Voltage Vdo 制造商:Linear Technology 功能描述:LDO, ADJ, 0V-32V, 600MA, DFN-10, Input Voltage Min:-36V, Input Voltage Max:-1.5V, Output Voltage Min:-32V, Output Voltage Max:0V, Output Current:600mA, Dropout Voltage Vdo:300mV, No. of Pins:10, Operating Temperature Min:-40C , RoHS Compliant: Yes |
| LT3090EMSE#PBF | 制造商:Linear Technology 功能描述:IC REG LDO NEG ADJ 0.6A 12MSOP 制造商:Linear Technology 功能描述:IC, LINEAR VOLT REG, -36V, MSOP-12 制造商:Linear Technology 功能描述:LDO, ADJ, 0V-32V, 600MA, MSOP-12, Primary Input Voltage:-36V, Dropout Voltage Vd |
| LT3090EMSE#TRPBF | 制造商:Linear Technology 功能描述:IC REG LDO NEG ADJ 0.6A 12MSOP 制造商:Linear Technology 功能描述:LDO, ADJ, 0V-32V, 600MA, MSOP-12, Primary Input Voltage:-36V, Dropout Voltage Vd |
| LT3090HDD#PBF | 制造商:Linear Technology 功能描述:IC REG LDO NEG ADJ 0.6A 10DFN 制造商:Linear Technology 功能描述:IC, LINEAR VOLT REG, -36V, DFN-10 制造商:Linear Technology 功能描述:LDO, ADJ, 0V-32V, 600MA, DFN-10, Input Voltage Min:-36V, Input Voltage Max:-1.5V, Output Voltage Min:-32V, Output Voltage Max:0V, Output Current:600mA, Dropout Voltage Vdo:300mV, No. of Pins:10, Operating Temperature Min:-40C , RoHS Compliant: Yes |
| LT3090HMSE#PBF | 制造商:Linear Technology 功能描述:IC REG LDO NEG ADJ 0.6A 12MSOP 制造商:Linear Technology 功能描述:IC, LINEAR VOLT REG, -36V, MSOP-12 |
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