参数资料
| 型号： | LT3050MPMSE#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 18/26页 |
| 文件大小： | 0K |
| 描述： | IC REG LDO ADJ .1A 12MSOP |
| 产品培训模块： | LT3050 - 100mA, Low Noise Linear Regulator With Precision Current Limit And Diagnostic Functions |
| 标准包装： | 2,500 |
| 稳压器拓扑结构： | 正，可调式 |
| 输出电压： | 0.6 V ~ 44.5 V |
| 输入电压： | 1.6 V ~ 45 V |
| 电压 - 压降（标准）： | 0.34V @ 100mA |
| 稳压器数量： | 1 |
| 电流 - 输出： | 100mA |
| 电流 - 限制（最小）： | 110mA |
| 工作温度： | -55°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 12-TSSOP （0.118"，3.00mm 宽）裸露焊盘 |
| 供应商设备封装： | 12-MSOP，裸露焊盘 |
| 包装： | 带卷 (TR) |
LT3050 Series
APPLICATIONS INFORMATION
Table 1 shows 1% resistor divider values for some common
output voltages with a resistor divider current of 5μA.
Table 1. Output Voltage Resistor Divider Valves
V OUT (V) R1 (k Ω) R2 (k Ω)
1.2 118 118
1.5 121 182
1.8 124 249
Using a feedforward capacitor (C FF ) from V OUT to the ADJ
pin has the added bene?t 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
2.5
3
3.3
5
115
124
124
115
365
499
562
845
(See Figure 3 and Transient Response in the Typical Perf-
ormance Characteristics section).
During start-up, the internal reference will soft-start if a
reference bypass capacitor is present. Regulator start-
Bypass Capacitance, Output Voltage Noise and
Transient Response
The LT3050 regulator provides 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 will
up time is directly proportional to the size of the bypass
capacitor, slowing to 6ms with a 10nF bypass capacitor
(See Start-up Time vs REF/BYP Capacitor in the Typical
Performance Characteristics section). The reference by-
pass capacitor is actively pulled low during shutdown to
reset the internal reference.
(
)
? I FB DIVIDER
(
DIVIDER = 10μA FOR FIXED V OUT
bypasstheinternalreferenceoftheregulator,providinga
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.
V IN
IN OUT
LT3050-5
SHDN ADJ
GND REF/BYP
C REF/BYP
3050 F02
C FF
C FF
I FB
V OUT
C OUT
10nF
10μA
V OUT
R1 + R2
)
To lower the output voltage noise for higher output voltages,
include a feedforward capacitor (C FF ) from V OUT to the
ADJ pin. A good quality, low leakage capacitor is recom-
Figure 2. Feedforward Capacitor for Fast Transient Response
mended. This capacitor will bypass the error ampli?er 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.
0
100pF
1nF
10nF
LOAD CURRENT
V OUT = 5V
C OUT = 10μF
I FB-DIVIDER = 10μA
Higher values of output voltage noise are often measured if
care is not exercised with regard to circuit layout and test-
100mA/DIV
100μs/DIV
3050 F03
ing. Crosstalk from nearby traces induces unwanted noise
Figure 3. Transient Response vs Feedforward Capacitor
onto the LT3050’s output. Power supply ripple rejection
must also be considered. The LT3050 regulator does not
have unlimited power supply rejection and passes a small
portion of the input noise through to the output.
3050fa
18
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