参数资料
| 型号： | LT3060IDC-5#TRMPBF |
| 厂商： | Linear Technology |
| 文件页数： | 17/26页 |
| 文件大小： | 0K |
| 描述： | IC REG LDO 5V .1A 8DFN |
| 标准包装： | 500 |
| 稳压器拓扑结构： | 正，固定式 |
| 输出电压： | 5V |
| 输入电压： | 最高 45 V |
| 电压 - 压降（标准）： | 0.3V @ 100mA |
| 稳压器数量： | 1 |
| 电流 - 输出： | 100mA |
| 电流 - 限制（最小）： | 110mA |
| 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（2x2） |
| 包装： | 带卷 (TR) |
LT3060 Series
APPLICATIONS INFORMATION
Table 1 shows 1% resistor divider values for some common
output voltages with a resistor divider current of about 5μA.
Table 1. Output Voltage Resistor Divider Values
V OUT R1 R2
(V) (k Ω) (k Ω)
1.2 118 118
1.5 121 182
1.8 124 249
2.5 115 365
3 124 499
3.3 124 562
5 115 845
Bypass Capacitance, Output Voltage Noise and
Transient Response
The LT3060 regulators provide low output voltage noise
over the 10Hz to 100kHz bandwidth while operating at
full load with the addition of a reference bypass capacitor
(C REF/BYP ) from the REF/BYP pin to GND. A good quality,
low leakage capacitor is recommended. This capacitor
bypasses the internal reference of the regulator, provid-
ing a low frequency noise pole. With the use of 10nF for
C REF/BYP, the output voltage noise decreases to as low as
30μV RMS when the output voltage is set for 0.6V. For higher
output voltages (generated by using a feedback resistor
divider), the output voltage noise gains up accordingly
when using C REF/BYP by itself.
To lower the output voltage noise for higher output volt-
ages, include a feedforward capacitor (C FF ) from V OUT
to the ADJ pin. A good quality, low leakage capacitor is
recommended. This capacitor bypasses the error amplifier
of the regulator, providing a low frequency noise pole. With
the use of 10nF for both C FF and C REF/BYP , output voltage
noise decreases to 30μV RMS when the output voltage is
set to 5V by a 5μA feedback resistor divider. If the current
in the feedback resistor divider is doubled, C FF must also
be doubled to achieve equivalent noise performance.
Higher values of output voltage noise are often measured
if care is not exercised with regard to circuit layout and
testing. Crosstalk from nearby traces induces unwanted
noise onto the LT3060’s output. Power supply ripple rejec-
tion must also be considered. The LT3060 regulators do
not have unlimited power supply rejection and will pass
a small portion of the input noise through to the output.
Using a feedforward capacitor (C FF ) from V OUT to the ADJ
pin has the added benefit of improving transient response
for output voltages greater than 0.6V. With no feedforward
capacitor, the settling time will increase as the output
voltage is raised above 0.6V. Use the equation in Figure 2
to determine the minimum value of C FF to achieve a
transient response that is similar to 0.6V output voltage
performance regardless of the chosen output voltage
(see Figure 3 and Transient Response in the Typical Perf-
ormance Characteristics section).
IN
OUT
V OUT
0
V OUT = 5V
C OUT = 10μF
I FB-DIVIDER = 5μA
? ( I DIVIDER )
C FF ≥
5μA
I FB ? DIVIDER =
V IN
LT3060 R2
SHDN ADJ
GND REF/BYP R1
C REF/BYP
3060 F02
C FF C OUT
4.7nF
FB ?
V OUT
R1 + R2
100pF
1nF
10nF
LOAD CURRENT
100mA/DIV
100μs/DIV
3060 F03
Figure 2. Feedforward Capacitor for Fast Transient Response
Figure 3. Transient Response vs Feedforward Capacitor
3060fb
17
相关PDF资料 |
PDF描述 |
|---|---|
| RMC30DREH-S93 | CONN EDGECARD 60POS .100 EYELET |
| LT3060IDC-3.3#TRPBF | IC REG LDO 3.3V .1A 8DFN |
| LT3060IDC-3.3#TRMPBF | IC REG LDO 3.3V .1A 8DFN |
| LT3060IDC-2.5#TRPBF | IC REG LDO 2.5V .1A 8DFN |
| ACC26DRYS | CONN EDGECARD 52POS .100 DIP SLD |
相关代理商/技术参数 |
参数描述 |
|---|---|
| LT3060IDCPBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:45V VIN, Micropower, Low Noise, 100mA Low Dropout, Linear Regulator |
| LT3060IDCTR | 制造商:LINER 制造商全称:Linear Technology 功能描述:45V VIN, Micropower, Low Noise, 100mA Low Dropout, Linear Regulator |
| LT3060IDCTRPBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:45V VIN, Micropower, Low Noise, 100mA Low Dropout, Linear Regulator |
| LT3060ITS8 | 制造商:LINER 制造商全称:Linear Technology 功能描述:45V VIN, Micropower, Low Noise, 100mA Low Dropout, Linear Regulator |
| LT3060ITS8#PBF | 制造商:Linear Technology 功能描述:LDO Regulator Pos 0.6V to 44.5V 0.1A 8-Pin TSOT-23 |
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