参数资料
| 型号： | LT3083IFE#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 10/28页 |
| 文件大小： | 0K |
| 描述： | IC REG LDO ADJ 3A 16-TSSOP |
| 标准包装： | 95 |
| 稳压器拓扑结构： | 正，可调式 |
| 输出电压： | 可调至 23V |
| 输入电压： | 1.2 V ~ 23 V |
| 电压 - 压降（标准）： | 1.25V @ 3A |
| 稳压器数量： | 1 |
| 电流 - 输出： | 3A |
| 电流 - 限制（最小）： | 3A |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-TSSOP（0.173"，4.40mm）裸露焊盘 |
| 供应商设备封装： | 16-TSSOP-EP |
| 包装： | 管件 |
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LT3083
APPLICATIONS INFORMATION
+
+
V OUT
TheLT3083regulatoriseasytouseandhasalltheprotection
features expected in high performance regulators. Included
are short-circuit protection and safe operating area protec-
tion, as well as thermal shutdown with hysteresis.
The LT3083 fits well in applications needing multiple rails.
This 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. When the input is pre-regulated,
such as with a 5V or 3.3V input supply, external resistors
can help spread the heat.
A precision “0” TC 50μA reference current source connects
to the noninverting input of a power operational amplifier.
The power operational amplifier provides a low impedance
buffered output to the voltage on the noninverting input.
A single resistor from the noninverting input to ground
sets the output voltage. If this resistor is set to 0?, zero
output voltage results. Therefore, any output voltage can
be obtained between zero and the maximum defined by
the input power supply.
The benefit of using a true internal current source as the
reference, as opposed to a bootstrapped reference in older
regulators, is not so obvious in this architecture. A true
reference current source allows the regulator to have gain
and frequency response independent of the impedance on
the positive input. On older adjustable regulators, such as
the LT1086, loop gain changes with output voltage and
bandwidth changes if the adjustment pin is bypassed to
ground. For the LT3083, the loop gain is unchanged with
output voltage changes or bypassing. Output regulation
is not a fixed percentage of output voltage, but is a fixed
fraction of millivolts. Use of a true current source allows
all of the gain in the buffer amplifier to provide regulation,
and none of that gain is needed to amplify up the reference
to a higher output voltage.
The LT3083 has the collector of the output transistor con-
nected to a separate pin from the control input. Since the
dropout on the collector (IN pin) is typically only 310mV,
two supplies can be used to power the LT3083 to reduce
dissipation: a higher voltage supply for the control circuitry
and a lower voltage supply for the collector. This increases
efficiency and reduces dissipation. To further spread the
heat, a resistor inserted in series with the collector moves
some of the heat out of the IC to spread it on the PC board
(see the section Reducing Power Dissipation).
The LT3083 can be operated in two modes. Three termi-
nal mode has the V CONTROL pin connected to the IN pin
and gives a limitation of 1.25V dropout. Alternatively, the
V CONTROL pin is separately tied to a higher voltage and the
IN pin to a lower voltage giving 310mV dropout on the IN
pin, minimizing total power dissipation. This allows for a
3A supply regulating from 2.5V IN to 1.8V OUT or 1.8V IN to
1.2V OUT with low power dissipation.
Programming Output Voltage
The LT3083 sources a 50μA reference current that flows
out of the SET pin. Connecting a resistor from SET to
ground generates a voltage that becomes the reference
point for the error amplifier (see Figure 1). The refer-
ence voltage equals 50μA multiplied by the value of
the SET pin resistor. Any voltage can be generated and
there is no minimum output voltage for the regulator.
IN LT3083
V CONTROL
50μA
+
V IN V CONTROL –
OUT
SET
C OUT
R SET C SET
3083 F01
V OUT = 50μA ? R SET
Figure 1. Basic Adjustable Regulator
3083fa
10
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LT3083IQ | 制造商:LINER 制造商全称:Linear Technology 功能描述:Adjustable 3A Single Resistor Low Dropout Regulator |
| LT3083IQ#PBF | 功能描述:IC REG LDO ADJ 3A 5-DDPAK RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - 线性 系列:- 标准包装:3,000 系列:- 稳压器拓扑结构:正，固定式 输出电压:2.5V 输入电压:2.5 V ~ 5.5 V 电压 - 压降（标准）:- 稳压器数量:1 电流 - 输出:300mA（最小值） 电流 - 限制（最小）:360mA 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:SOT-23-5 细型，TSOT-23-5 供应商设备封装:TSOT-23-5 包装:带卷 (TR) |
| LT3083IQ#TRPBF | 功能描述:IC REG LDO ADJ 3A 5-DDPAK RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - 线性 系列:- 标准包装:3,000 系列:- 稳压器拓扑结构:正，固定式 输出电压:2.5V 输入电压:2.5 V ~ 5.5 V 电压 - 压降（标准）:- 稳压器数量:1 电流 - 输出:300mA（最小值） 电流 - 限制（最小）:360mA 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:SOT-23-5 细型，TSOT-23-5 供应商设备封装:TSOT-23-5 包装:带卷 (TR) |
| LT3083IT | 制造商:LINER 制造商全称:Linear Technology 功能描述:Adjustable 3A Single Resistor Low Dropout Regulator |
| LT3083IT#PBF | 功能描述:IC REG LDO ADJ 3A TO-220-5 RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - 线性 系列:- 标准包装:3,000 系列:- 稳压器拓扑结构:正，固定式 输出电压:2.5V 输入电压:2.5 V ~ 5.5 V 电压 - 压降（标准）:- 稳压器数量:1 电流 - 输出:300mA（最小值） 电流 - 限制（最小）:360mA 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:SOT-23-5 细型，TSOT-23-5 供应商设备封装:TSOT-23-5 包装:带卷 (TR) |
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