参数资料
| 型号： | LT1965EDD#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 12/22页 |
| 文件大小： | 0K |
| 描述： | IC REG LDO ADJ 1.1A 8-DFN |
| 产品培训模块： | LT1965 - 1.1A, Low Noise, Low Dropout Linear Regulator More Information on LDOs |
| 标准包装： | 2,500 |
| 稳压器拓扑结构： | 正，可调式 |
| 输出电压： | 1.2 V ~ 19.5 V |
| 输入电压： | 1.8 V ~ 20 V |
| 电压 - 压降（标准）： | 0.31V @ 1.1A |
| 稳压器数量： | 1 |
| 电流 - 输出： | 1.1A |
| 电流 - 限制（最小）： | 1.2A |
| 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： | 带卷 (TR) |
LT1965 Series
APPLICATIONS INFORMATION
+
R2 ?
?
V OUT = 1.20V ? 1 + ? + I ADJ ? R2
R1 V ADJ = 1.20V
? – 4.25mV = – 17.71mV
TheLT1965seriesare1.1Alowdropoutregulatorswith
shutdown. The devices are capable of supplying 1.1A at
a typical dropout voltage of 310mV. The low operating
quiescent current (500μA for the adjustable version, 600μA
for the fixed voltage versions) drops to less than 1μA in
shutdown. In addition to the low quiescent current, the
LT1965 regulators incorporate several protection features
that makes them ideal for use in battery-powered systems.
The devices protect themselves against both reverse-input
and reverse-output voltages. In battery backup applica-
tions, if a backup battery holds up the output when the input
is pulled to ground, the LT1965 performs like it has a diode
in series with its output, preventing reverse-current flow.
Adjustable Operation
The LT1965 adjustable version has an output voltage range
of 1.20V to 19.5V. Figure 2 illustrates that the ratio of
two external resistors sets the output voltage. The device
servos the output to maintain the ADJ pin voltage at 1.20V
referenced to ground. R1’s current equals 1.20V/R1. R2’s
current equals R1’s current plus the ADJ pin bias current.
The ADJ pin bias current, 1.3μA at 25°C, flows through
R2 into the ADJ pin. Use the formula in Figure 2 to calcu-
late output voltage. Linear Technology recommends that
R1’s value be less than 12.1k to minimize output voltage
errors due to the ADJ pin bias current. In shutdown, the
output turns off and the divider current is zero. For curves
depicting ADJ Pin Voltage vs Temperature and ADJ Pin
Bias Current vs Temperature, see the Typical Performance
Characteristics section.
The adjustable device is tested and specified with the ADJ
pin tied to the OUT pin for an output voltage of 1.20V.
Specifications for output voltages greater than 1.20V are
proportional to the ratio of the desired output voltage to
IN OUT V OUT
V IN LT1965 R2
ADJ ? R1 ?
GND
1965 F02 I ADJ = 1.3μA AT 25oC
OUTPUT RANGE = 1.20V TO 19.5V
Figure 2. Adjustable Operation
1.20V: V OUT /1.20V. For example, load regulation for an
output current change of 1mA to 1.1A is typically –4.25mV
at V OUT = 1.20V. At V OUT = 5V, load regulation is:
5V
1.20V
Output Capacitance
The LT1965’s design is stable with a wide range of out-
put capacitors. The ESR of the output capacitor affects
stability, most notably with small capacitors. A minimum
output capacitor of 10μF with an ESR of 0.3 W or less is
recommended to prevent oscillations. The LT1965 is a low
quiescent current device and output load transient response
is a function of output capacitance. Larger values of output
capacitance decrease the peak deviations and provide
improved transient response for larger current changes.
Ceramic capacitors require extra consideration. Manufac-
turers make ceramic capacitors with a variety of dielectrics,
each with different behavior across temperature and applied
voltage. The most common dielectrics used are specified
with EIA temperature characteristic codes of Z5U, Y5V,
X5R and X7R. The Z5U and Y5V dielectrics provide high
C-V products in a small package at low cost, but exhibit
strong voltage and temperature coefficients as shown in
Figures 3 and 4. When used with a 5V regulator, a 16V
10μF Y5V capacitor can exhibit an effective value as low
as 1μF to 2μF for the DC bias applied and over the operat-
ing temperature range. The X5R and X7R dielectrics yield
much more stable characteristics and are more suitable
for use as the output capacitor. The X7R type works over
a wider temperature range and has better temperature
stability whereas X5R is less expensive and is available in
higher values. Care still must be exercised when using X5R
and X7R capacitors; the X5R and X7R codes only specify
operating temperature range and maximum capacitance
change over temperature. Capacitance change due to DC
bias with X5R and X7R capacitors is better than Y5V and
Z5U capacitors, but can still be significant enough to drop
capacitor values below appropriate levels. Capacitor DC
bias characteristics tend to improve as component case
size increases, but expected capacitance at operating
voltages should be verified.
12
For more information www.linear.com/LT1965
1965fb
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相关代理商/技术参数 |
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| LT1965EMS8E | 制造商:Linear Technology 功能描述:LDO Regulator Pos 1.2V to 19.5V 1.1A 8-Pin MSOP EP |
| LT1965EMS8E#PBF | 功能描述:IC REG LDO ADJ 1.1A 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 |
| LT1965EMS8E#PBF | 制造商:Linear Technology 功能描述:IC VOLT REGULATOR ADJUSTABLE +1.2 TO 制造商:Linear Technology 功能描述:IC ADJ LDO REG 1.2V TO 19.5V 1.1A MSOP-8 |
| LT1965EMS8E#TRPBF | 功能描述:IC REG LDO ADJ 1.1A 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 |
| LT1965EMS8E-1.5#PBF | 功能描述:IC REG LDO 1.5V 1.1A 8-MSOP 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 |
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