参数资料
| 型号： | LT3011IDD#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 10/16页 |
| 文件大小： | 0K |
| 描述： | IC REG LDO ADJ 50MA 10-DFN |
| 产品培训模块： | LT3011 - 50mA, 3V to 80V Low Dropout Micropower Linear Regulator with PWRGD 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： | 1.24 V ~ 60 V |
| 输入电压： | 2.8 V ~ 80 V |
| 电压 - 压降（标准）： | 0.3V @ 50mA |
| 稳压器数量： | 1 |
| 电流 - 输出： | 50mA |
| 电流 - 限制（最小）： | 60mA |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 10-WFDFN 裸露焊盘 |
| 供应商设备封装： | 10-DFN（3x3） |
| 包装： | 带卷 (TR) |
LT3011
APPLICATIONS INFORMATION
C TIME =
in a small package, but they tend to have strong voltage
and temperature coef?cients, as shown in Figures 2 and 3.
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 voltage applied and over the operating tempera-
ture range. The X5R and X7R dielectrics result in more
stable characteristics and are more suitable for use as the
output capacitor. The X7R type has better stability across
temperature, while the X5R is less expensive and is avail-
able 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 signi?cant enough
to drop capacitor values below appropriate levels. Capaci-
tor DC bias characteristics tend to improve as component
case size increases, but expected capacitance at operating
voltage should be veri?ed.
Voltage and temperature coef?cients are not the only
sources of problems. Some ceramic capacitors have a
piezoelectric response. A piezoelectric device generates
voltage across its terminals due to mechanical stress, simi-
lar to the way piezoelectric accelerometer or microphone
works. For a ceramic capacitor, the stress can be induced
by vibrations in the system or thermal transients.
PWRGD Flag and Timing Capacitor Delay
The PWRGD ?ag is used to indicate that the ADJ pin volt-
age is within 10% of the regulated voltage. The PWRGD
pin is an open-collector output, capable of sinking 50μA
of current when the ADJ pin voltage is low. There is no
internal pull-up on the PWRGD pin; an external pull-up
resistor must be used. When the ADJ pin rises to within
10% of its ?nal reference value, a delay timer is started.
At the end of this delay, programmed by the value of the
capacitor on the C T pin, the PWRGD pin switches to a high
impedance and is pulled up to a logic level by an external
pull-up resistor.
To calculate the capacitor value on the C T pin, use the
following formula:
I CT ? t DELAY
V CT ( HIGH ) ? V CT ( LOW )
Figure 4 shows a block diagram of the PWRGD circuit. At
start-up, the timing capacitor is discharged and the PWRGD
pin will be held low. As the output voltage increases and
the ADJ pin crosses the 90% threshold, the JK ?ip?op is
reset, and the 3μA current source begins to charge the
timing capacitor. Once the voltage on the C T pin reaches
the V CT(HIGH) threshold (approximately 1.7V at 25°C), the
capacitor voltage is clamped and the PWRGD pin is set to
a high impedance state.
20
0
BOTH CAPACITORS ARE 16V,
1210 CASE SIZE, 10 F
40
20
–20
X5R
0
X5R
–20
–40
–40
Y5V
–60
Y5V
–60
–80
–80
BOTH CAPACITORS ARE 16V,
–100
0
2
4
6
8
10
12
14
16
–100
1210 CASE SIZE, 10 F
–50 –25 0 25
50
75
100
125
DC BIAS VOLTAGE (V)
3011 F02
Figure 2. Ceramic Capacitor DC Bias Characteristics
TEMPERATURE ( C)
3011 F03
Figure 3. Ceramic Capacitor Temperature Characteristics
3011f
10
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LT3011IMSE | 制造商:LINER 制造商全称:Linear Technology 功能描述:50mA, 3V to 80V Low Dropout Micropower Linear Regulator with PWRGD |
| LT3011IMSE#PBF | 功能描述:IC REG LDO ADJ 50MA 12-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 |
| LT3011IMSE#TRPBF | 功能描述:IC REG LDO ADJ 50MA 12-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 |
| LT3011IMSEPBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:50mA, 3V to 80V Low Dropout Micropower Linear Regulator with PWRGD |
| LT3011IMSETR | 制造商:LINER 制造商全称:Linear Technology 功能描述:50mA, 3V to 80V Low Dropout Micropower Linear Regulator with PWRGD |
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