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参数资料
| 型号： | LT6654BHS6-2.5#TRPBF |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 基准电压源/电流源 |
| 英文描述： | 1-OUTPUT THREE TERM VOLTAGE REFERENCE, 2.5 V, PDSO6 |
| 封装： | 1 MM HEIGHT, LEAD FREE, PLASTIC, MO-193, TSOT-23, 6 PIN |
| 文件页数： | 11/12页 |
| 文件大小： | 331K |
| 代理商： | LT6654BHS6-2.5#TRPBF |
LT6654
8
6654f
Positive or Negative Operation
The LT6654 can be operated in series mode or as a negative
voltage reference. A typical series connection is shown
on the front page of this data sheet.
The circuit in Figure 7 shows an LT6654 congured for
negative operation. In this conguration, a positive volt-
age is required at VIN (Pin 4) to bias the LT6654 internal
circuitry. This voltage must be current limited with R1
to keep the output PNP transistor from turning on and
driving the grounded output. C1 provides stability dur-
ing load transients. This connection maintains nearly the
same accuracy and temperature coefcient of the positive
connected LT6654.
APPLICATIONS INFORMATION
dissipation is approximately PD = 33.5V 10mA = 335mW,
which causes an increase in the die temperature of 64°C.
This could increase the junction temperature above 125°C
(TJMAX is 150°C) and may cause the output to shift due
to thermal hysteresis.
PC Board Layout
The mechanical stress of soldering a surface mount volt-
age reference to a PC board can cause the output voltage
to shift and temperature coefcient to change. These two
changes are not correlated. For example, the voltage may
shift but the temperature coefcient may not.
To reduce the effects of stress-related shifts, mount the
reference near the short edge of the PC board or in a
corner. In addition, slots can be cut into the board on
two sides of the device.
The capacitors should be mounted close to the LT6654.
The GND and VOUT traces should be as short as possible
to minimize I R drops. High trace resistance directly
impacts load regulation.
IR Reow Shift
The different expansion and contraction rates of the ma-
terials that make up the LT6654 package may cause the
output voltage to shift after undergoing IR reow. Lead
free solder reow proles reach over 250°C, considerably
more than with lead based solder. A typical lead free IR
reow prole is shown in Figure 8. Similar proles are found
using a convection reow oven. LT6654 devices run up
Long-Term Drift
Long-term drift cannot be extrapolated from accelerated
high temperature testing. This erroneous technique
gives drift numbers that are wildly optimistic. The only
way long-term drift can be determined is to measure it
over the time interval of interest. The LT6654 drift data
was taken on 40 parts that were soldered into PC boards
similar to a real world application. The boards were then
placed into a constant temperature oven with TA = 30°C,
their outputs scanned regularly and measured with an
8.5 digit DVM. Long-term drift curves are shown in the
Typical Performance Characteristics section.
Hysteresis
The hysteresis data is shown in the Typical Performance
Characteristics. The LT6654 is capable of dissipating
relatively high power. With a maximum input voltage and
10mA load current applied to the LT6654-2.5 the power
LT6654-2.5
6
4
1, 2
VEE
VOUT = –2.5
0.1μF
3V
4.7k
6654 F
C1
1μF
VEE – VOUT
500μA
R1 =
Figure 7. Using the LT6654-2.5 to Build a –2.5V Reference
Figure 8. Lead Free Reow Prole
MINUTES
TEMPERA
TURE
(°C)
0
75
RAMP
DOWN
tP
30s
40s
tL
130s
120s
150
225
300
246
8
6654 F08
10
RAMP TO
150°C
380s
TP = 260°C
TL = 217°C
TS(MAX) = 200°C
TS = 190°C
T = 150°C
相关PDF资料 |
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| LT6654AHS6-2.5#TRMPBF | THREE TERM VOLTAGE REFERENCE, PDSO6 |
| LT6654AHS6-2.5#PBF | 1-OUTPUT THREE TERM VOLTAGE REFERENCE, 2.5 V, PDSO6 |
| LT6654AHS6-2.5#TRPBF | 1-OUTPUT THREE TERM VOLTAGE REFERENCE, 2.5 V, PDSO6 |
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LT6654BHS6-3#PBF | 制造商:Linear Technology 功能描述:Bulk |
| LT6654BHS6-3#TRMPBF | 功能描述:IC VREF SERIES PREC 3V TSOT-23-6 RoHS:是 类别:集成电路 (IC) >> PMIC - 电压基准 系列:- 产品培训模块:Voltage Reference Basics 标准包装:100 系列:- 基准类型:旁路，精度 输出电压:4.096V 容差:±0.075% 温度系数:50ppm/°C 输入电压:- 通道数:1 电流 - 阴极:1µA 电流 - 静态:- 电流 - 输出:10mA 工作温度:0°C ~ 70°C 安装类型:表面贴装 封装/外壳:8-SOIC（0.154"，3.90mm 宽） 供应商设备封装:8-SOIC 包装:管件 |
| LT6654BHS6-3#TRPBF | 功能描述:IC VREF SERIES PREC 3V TSOT-23-6 RoHS:是 类别:集成电路 (IC) >> PMIC - 电压基准 系列:- 产品培训模块:Voltage Reference Basics 标准包装:100 系列:- 基准类型:旁路，精度 输出电压:4.096V 容差:±0.075% 温度系数:50ppm/°C 输入电压:- 通道数:1 电流 - 阴极:1µA 电流 - 静态:- 电流 - 输出:10mA 工作温度:0°C ~ 70°C 安装类型:表面贴装 封装/外壳:8-SOIC（0.154"，3.90mm 宽） 供应商设备封装:8-SOIC 包装:管件 |
| LT6654BHS6-3.3#PBF | 制造商:Linear Technology 功能描述:Bulk |
| LT6654BHS6-3.3#TRMPBF | 功能描述:IC VREF SERIES PREC TSOT-23-6 RoHS:是 类别:集成电路 (IC) >> PMIC - 电压基准 系列:- 标准包装:3,000 系列:- 基准类型:旁路，精度 输出电压:3V 容差:±0.5% 温度系数:100ppm/°C 输入电压:- 通道数:1 电流 - 阴极:82µA 电流 - 静态:- 电流 - 输出:15mA 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:6-TSSOP（5 引线），SC-88A，SOT-353 供应商设备封装:SC-70-5 包装:带卷 (TR) 其它名称:296-20888-2 |
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