参数资料
| 型号： | LT1964IDD#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 14/16页 |
| 文件大小： | 0K |
| 描述： | IC REG LDO NEG ADJ .2A 8DFN |
| 产品培训模块： | More Information on LDOs |
| 标准包装： | 121 |
| 稳压器拓扑结构： | 负，可调式 |
| 输出电压： | -1.22 V ~ -20 V |
| 输入电压： | -1.9 V ~ -20 V |
| 电压 - 压降（标准）： | 0.34V @ 200mA |
| 稳压器数量： | 1 |
| 电流 - 输出： | 200mA |
| 电流 - 限制（最小）： | 220mA |
| 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： | 管件 |
LT1964
APPLICATIONS INFORMATION
I OUT(MAX) ? (V IN(MAX) – V OUT ) + (I GND ? V IN(MAX) )
where,
I OUT(MAX) = –100mA
V IN(MAX) = –8V
I GND at (I OUT = –100mA, V IN = –8V) = –2mA
so,
P = –100mA ? (–8V + 5V) + (–2mA ? –8V) = 0.32W
The thermal resistance (junction to ambient) will be in the
range of 125°C/W to 150°C/W for the SOT-23 package
depending on the copper area. So the junction temperature
rise above ambient will be approximately equal to:
0.32W ? 140°C/W = 44.2°C
The maximum junction temperature will then be equal to
the maximum junction temperature rise above ambient
plus the maximum ambient temperature or:
T JMAX = 50°C + 44.2°C = 94.2°C
Protection Features
The LT1964 incorporates several protection features
which make it ideal for use in battery-powered circuits.
In addition to the normal protection features associated
with monolithic regulators, such as current limiting and
thermal limiting, the device is protected against reverse
input voltages and reverse output voltages.
Current limit protection and thermal overload protection
are intended to protect the device against current overload
conditions at the output of the device. For normal operation,
the junction temperature should not exceed 125°C.
The output of the LT1964 can be pulled above ground
without damaging the device. If the input is left open circuit
or grounded, the output can be pulled above ground by
20V. For ?xed voltage versions, the output will act like a
large resistor, typically 500k or higher, limiting current ?ow
act like an open circuit, no current will ?ow into the pin.
If the input is powered by a voltage source, the output
will sink the short-circuit current of the device and will
protect itself by thermal limiting. In this case, grounding
the SHDN pin will turn off the device and stop the output
from sinking the short-circuit current.
Like many IC power regulators, the LT1964 series have
safe operating area protection. The safe area protection
activates at input-to-output differential voltages greater
than –7V. The safe area protection decreases the current
limit as the input-to-output differential voltage increases
and keeps the power transistor inside a safe operating
region for all values of forward input to-output voltage.
The protection is designed to provide some output current
at all values of input-to-output voltage up to the device
breakdown. A 50μA load is required at input-to-output
differential voltages greater than –7V.
When power is ?rst turned on, as the input voltage rises,
the output follows the input, allowing the regulator to start
up into very heavy loads. During start-up, as the input
voltage is rising, the input-to-output voltage differential
is small, allowing the regulator to supply large output
currents. With a high input voltage, a problem can occur
wherein removal of an output short will not allow the
output voltage to fully recover. Other regulators, such as
the LT1175, also exhibit this phenomenon, so it is not
unique to the LT1964 series.
The problem occurs with a heavy output load when
the input voltage is high and the output voltage is low.
Common situations are immediately after the removal of
a short-circuit or when the SHDN pin is pulled high after
the input voltage has already been turned on. The load line
for such a load may intersect the output current curve at
two points. If this happens, there are two stable operat-
ing points for the regulator. With this double intersection,
the input supply may need to be cycled down to zero and
brought up again to make the output recover.
to less than 40μA. For adjustable versions, the output will
1964fb
14
相关PDF资料 |
PDF描述 |
|---|---|
| MIC29202WU | IC REG LDO ADJ .4A TO263-5 |
| RBA50DTKT | CONN EDGECARD 100PS DIP .125 SLD |
| 1210-153J | INDUCTOR FERRITE CORE 15UH SMD |
| HMM15DRKF | CONN EDGECARD 30POS DIP .156 SLD |
| HSM18DRAN | CONN EDGECARD 36POS R/A .156 SLD |
相关代理商/技术参数 |
参数描述 |
|---|---|
| LT1964IDDTR | 制造商:LINER 制造商全称:Linear Technology 功能描述:200mA, Low Noise,Low Dropout Negative Micropower Regulator |
| LT1964IDDTRPBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:200mA, Low Noise,Low Dropout Negative Micropower Regulator |
| LT1964IS5-5 | 制造商:LINER 制造商全称:Linear Technology 功能描述:200mA, Low Noise,Low Dropout Negative Micropower Regulator |
| LT1964IS5-5#PBF | 制造商:Linear Technology 功能描述:LDO FIXED 0.34VDO -5V 200M 制造商:Linear Technology 功能描述:LDO, FIXED, 0.34VDO, -5V, 200MA, 5SOT23 制造商:Linear Technology 功能描述:LDO, FIXED, -5V, 200mA, SOT-23-5; Primary Input Voltage:-1.9V; Output Voltage Fixed:-5V; Dropout Voltage Vdo:340mV; No. of Pins:5; Output Current:200mA; Operating Temperature Min:-40C; Operating Temperature Max:125C ;RoHS Compliant: Yes |
| LT1964IS5-5#TRM | 制造商:Linear Technology 功能描述:LDO Regulator Neg -5V 0.2A 5-Pin TSOT-23 T/R |
发布紧急采购，3分钟左右您将得到回复。