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| 型号： | LT3085EDCB#TRMPBF |
| 厂商： | Linear Technology |
| 文件页数： | 9/28页 |
| 文件大小： | 0K |
| 描述： | IC REG LDO ADJ .5A 6-DFN |
| 产品培训模块： | LT3085 Adjustable Low Dropout Regulator More Information on LDOs |
| 标准包装： | 1 |
| 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： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-WFDFN 裸露焊盘 |
| 供应商设备封装： | 8-DFN-EP（3x3） |
| 包装： | 标准包装 |
| 产品目录页面： | 1331 (CN2011-ZH PDF) |
| 其它名称： | LT3085EDCB#TRMPBFDKR |
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LT3085
APPLICATIONS INFORMATION
The LT3085 can be operated in two modes. Three terminal
mode has the control pin connected to the power input pin
which gives a limitation of 1.35V dropout. Alternatively, the
“control” pin can be tied to a higher voltage and the power
IN pin to a lower voltage giving 275mV dropout on the
IN pin and minimizing the power dissipation. This allows
for a 500mA supply regulating from 2.5V IN to 1.8V OUT or
1.8V IN to 1.2V OUT with low dissipation.
Setting Output Voltage
With the low level current used to generate the reference
voltage, leakage paths to or from the SET pin can create
errors in the reference and output voltages. High quality
insulation should be used (e.g., Te?on, Kel-F); cleaning
of all insulating surfaces to remove ?uxes and other resi-
dues will probably be required. Surface coating may be
necessary to provide a moisture barrier in high humidity
environments.
Table 1. 1% Resistors for Common Output Voltages
The LT3085 generates a 10μA reference current that ?ows
out of the SET pin. Connecting a resistor from SET to
ground generates a voltage that becomes the reference
point for the error ampli?er (see Figure 1). The reference
voltage is a straight multiplication of the SET pin current
and the value of the resistor. Any voltage can be generated
and there is no minimum output voltage for the regulator.
Table 1 lists many common output voltages and standard
1% resistor values used to generate that output voltage.
V OUT
1V
1.2V
1.5V
1.8V
2.5V
3.3V
5V
R SET
100k
121k
150k
182k
249k
332k
499k
A minimum load current of 1mA is required to maintain
regulation regardless of output voltage. For true zero
voltage output operation, this 1mA load current must be
returned to a negative supply voltage.
Board leakage can be minimized by encircling the SET
pin and circuitry with a guardring operated at a potential
close to itself; the guardring should be tied to the OUT pin.
Guarding both sides of the circuit board is required. Bulk
IN
V CONTROL
LT3085
10μA
leakage reduction depends on the guard ring width. Ten
nanoamperes of leakage into or out of the SET pin and
associated circuitry creates a 0.1% error in the reference
V IN
+
+
V CONTROL
+
–
OUT
V OUT
voltage. Leakages of this magnitude, coupled with other
sources of leakage, can cause signi?cant offset voltage and
reference drift, especially over a wide temperature range.
SET
R SET
C SET
3085 F01
C OUT
If guardring techniques are used, this bootstraps any
stray capacitance at the SET pin. Since the SET pin is
a high impedance node, unwanted signals may couple
into the SET pin and cause erratic behavior. This will
V OUT = R SET ? 10μA
Figure 1. Basic Adjustable Regulator
be most noticeable when operating with minimum
output capacitors at full load current. The easiest way
to remedy this is to bypass the SET pin with a small
amount of capacitance from SET to ground, 10pF to
20pF is suf?cient.
3085fb
9
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LT3085EDCB-TRPBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:Adjustable 500mA Single Resistor Low Dropout Regulator |
| LT3085EMS8E | 制造商:Linear Technology 功能描述:LDO Regulator Pos 0V to 36V 0.5A 8-Pin MSOP EP |
| LT3085EMS8E#PBF | 功能描述:IC REG LDO ADJ .5A 8-MSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - 线性 系列:- 产品培训模块:MIC5365/66 Ultra-small LDO Regulators 标准包装:1 系列:- 稳压器拓扑结构:正，固定式 输出电压:3V 输入电压:最高 5.5V 电压 - 压降（标准）:0.155V @ 150mA 稳压器数量:1 电流 - 输出:150mA 电流 - 限制（最小）:200mA 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:4-UDFN 裸露焊盘，4-TMLF? 供应商设备封装:4-TMLF?（1x1） 包装:Digi-Reel® 其它名称:576-3192-6 |
| LT3085EMS8E#TRPBF | 功能描述:IC REG LDO ADJ .5A 8-MSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - 线性 系列:- 标准包装:800 系列:- 稳压器拓扑结构:正，固定式 输出电压:2.5V 输入电压:最高 16V 电压 - 压降（标准）:0.7V @ 4A 稳压器数量:1 电流 - 输出:4A 电流 - 限制（最小）:4.2A 工作温度:0°C ~ 125°C 安装类型:表面贴装 封装/外壳:TO-263-6，D²Pak（5 引线+接片），TO-263BA 供应商设备封装:TO-263-5 包装:带卷 (TR) 其它名称:AP1184K525L-13AP1184K525LDITR |
| LT3085EMS8EPBF | 制造商:Linear Technology 功能描述:LDO Regulator Adj. 0.5A Resistor MSOP8EP |
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