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参数资料
| 型号： | LT1185CQ |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 基准电压源/电流源 |
| 英文描述： | Cap-Free, NMOS, 150mA Low Dropout Regulator with Reverse Current Protection |
| 中文描述： | 2.5 V-25 V ADJUSTABLE NEGATIVE LDO REGULATOR, 1 V DROPOUT, PSSO5 |
| 封装： | PLASTIC, D2PAK-5 |
| 文件页数： | 10/16页 |
| 文件大小： | 191K |
| 代理商： | LT1185CQ |
10
LT1185
1185ff
Thermal Regulation
IC regulators have a regulation term not found in discrete
designs because the power transistor is thermally coupled
to the reference. This creates a shift in the output voltage
which is proportional to power dissipation in the regulator.
V
OUT
= P(K1 + K2
θ
JA
)
= (I
OUT
)(V
IN
– V
OUT
)(K1 + K2
θ
JA
)
K1 and K2 are constants. K1 is a fast time constant effect
caused by die temperature gradientswhich are estab-
lished within 50ms of a power change. K1 is specified on
the data sheet as thermal regulation, in percent per watt.
K2 is a long time constant term caused by the temperature
drift of the regulator reference voltage. It is also specified,
but in percent per degree centigrade. It must be multiplied
by overall thermal resistance, junction-to-ambient,
θ
JA
.
As an example, assume a 5V regulator with an input
voltage of 8V, load current of 2A, and a total thermal
resistance of 4
°
C/W, including junction-to-case, (use
control area specification), interface, and heat sink resis-
tance. K1 and K2, respectively, from the data sheet are
0.014%/W and 0.01%/
°
C.
V
OUT
= (2A)(8V – 5V)(0.014 + 0.01 4)
= 0.32%
This shift in output voltage could be in either direction
because K1 and K2 can be either positive or negative.
Thermal regulation is already included in the worst case
reference specification.
Output Voltage Reversal
Some IC regulators suffer from a latch-up state when their
output is forced to a reverse voltage of as little as one diode
drop. The latch-up state can be triggered without a fault
condition when the load is connected to an opposite
polarity supply instead of to ground. If the second supply
is turned on first, it will pull the output of the first supply
to a reverse voltage through the load. The first supply may
then latch off when turned on. This problem is particularly
annoying because the diode clamps which should always
be used to protect against polarity reversal do not usually
stop the latch-up problem.
The LT1185 is designed to allow output reverse polarity of
several volts without damage or latch-up, so that a simple
diode clamp can be used.
APPLICATIOU
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相关PDF资料 |
PDF描述 |
|---|---|
| LT1185IQ | Cap-Free, NMOS, 150mA Low Dropout Regulator with Reverse Current Protection |
| LT1185C | Cap-Free, NMOS, 150mA Low Dropout Regulator with Reverse Current Protection |
| LT1185CT | 9-Bit Odd/Even Parity Generators/Checkers 14-SOIC 0 to 70 |
| LT1185I | 9-Bit Odd/Even Parity Generators/Checkers 14-SOIC 0 to 70 |
| LT1185IT | 9-Bit Odd/Even Parity Generators/Checkers 14-SOIC 0 to 70 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| LT1185CQ#PBF | 功能描述:IC REG LDO NEG ADJ 3A DDPAK-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:3V 输入电压:最高 5.5V 电压 - 压降（标准）:0.12V @ 150mA 稳压器数量:1 电流 - 输出:150mA（最小值） 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:SOT-23-5 细型，TSOT-23-5 供应商设备封装:TSOT-23-5 包装:带卷 (TR) 其它名称:ADP160AUJZ-3.0-R7TR |
| LT1185CQ#TR | 功能描述:IC REG LDO NEG ADJ 3A DDPAK-5 RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - 线性 系列:- 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:2.3 V ~ 5.5 V 电压 - 压降（标准）:0.035V @ 150mA 稳压器数量:2 电流 - 输出:150mA 电流 - 限制（最小）:300mA 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:6-UFDFN 裸露焊盘，6-TMLF? 供应商设备封装:6-TMLF?（1.6x1.6） 包装:Digi-Reel® 产品目录页面:1104 (CN2011-ZH PDF) 其它名称:576-3018-6 |
| LT1185CQ#TRPBF | 功能描述:IC REG LDO NEG ADJ 3A DDPAK-5 RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - 线性 系列:- 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:2.3 V ~ 5.5 V 电压 - 压降（标准）:0.035V @ 150mA 稳压器数量:2 电流 - 输出:150mA 电流 - 限制（最小）:300mA 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:6-UFDFN 裸露焊盘，6-TMLF? 供应商设备封装:6-TMLF?（1.6x1.6） 包装:Digi-Reel® 产品目录页面:1104 (CN2011-ZH PDF) 其它名称:576-3018-6 |
| LT1185CQPBF | 制造商:Linear Technology 功能描述:LDO Regulator Neg/Pos 2.5-25V 3A DDPAK6 |
| LT1185CT | 功能描述:IC REG LDO NEG ADJ 3A TO220 RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - 线性 系列:- 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:2.3 V ~ 5.5 V 电压 - 压降（标准）:0.035V @ 150mA 稳压器数量:2 电流 - 输出:150mA 电流 - 限制（最小）:300mA 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:6-UFDFN 裸露焊盘，6-TMLF? 供应商设备封装:6-TMLF?（1.6x1.6） 包装:Digi-Reel® 产品目录页面:1104 (CN2011-ZH PDF) 其它名称:576-3018-6 |
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