参数资料
| 型号： | TC1174VUATR |
| 厂商： | Microchip Technology |
| 文件页数： | 4/12页 |
| 文件大小： | 0K |
| 描述： | IC REG LDO ADJ .3A 8MSOP |
| 标准包装： | 2,500 |
| 稳压器拓扑结构： | 正，可调式 |
| 输出电压： | 可调 |
| 输入电压： | 2.7 V ~ 6 V |
| 电压 - 压降（标准）： | 0.27V @ 300mA |
| 稳压器数量： | 1 |
| 电流 - 输出： | 300mA（最小） |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-TSSOP，8-MSOP（0.118"，3.00mm 宽） |
| 供应商设备封装： | 8-MSOP |
| 包装： | 带卷 (TR) |
TC1174
3.0
DETAILED DESCRIPTION
3.1
Bypass Input
The TC1174 is an adjustable low drop-out regulator.
Unlike bipolar regulators, the TC1174’s supply current
does not increase with load current. In addition, V OUT
remains stable and within regulation over the entire
0mA to I OUT MAX operating load current range, (an
important consideration in RTC and CMOS RAM
battery back-up applications).
A 470pF capacitor connected from the Bypass input to
ground reduces noise present on the internal
reference, which in turn significantly reduces output
noise. If output noise is not a concern, this input may be
left unconnected. Larger capacitor values may be
used, but results in a longer time period to rated output
voltage when power is initially applied.
Figure 3-1 shows a typical application circuit. The
regulator is enabled any time the shutdown input
3.2
Output Capacitor
(SHDN) is at or above V IH , and shutdown (disabled)
when SHDN is at or below V IL . SHDN may be
controlled by a CMOS logic gate, or I/O port of a
microcontroller. If the SHDN input is not required, it
should be connected directly to the input supply. While
in shutdown, supply current decreases to 0.05 μ A
(typical), V OUT falls to zero.
A 1 μ F (min) capacitor from V OUT to ground is required.
The output capacitor should have an effective series
resistance greater than 0.1 ? and less than 5.0 ? . A 1 μ F
capacitor should be connected from V IN to GND if there
is more than 10 inches of wire between the regulator
and the AC filter capacitor, or if a battery is used as the
power source. Aluminum electrolytic or tantalum
capacitor types can be used. (Since many aluminum
FIGURE 3-1:
TYPICAL APPLICATION
CIRCUIT
electrolytic capacitors freeze at approximately -30°C,
solid tantalums are recommended for applications
operating below -25°C.) When operating from sources
NC
C2
V OUT
R1
470K
+
C1
1 μ F
1
2
3
V OUT V IN
GND NC
TC1174
SHDN
8
7
6
+
1 μ F
Battery
Shutdown
Control
+
–
other than batteries, supply-noise rejection and
transient response can be improved by increasing the
value of the input and output capacitors and employing
passive filtering techniques.
3.3 Adjust Input
(from Power
R2
470K
4
ADJ
Bypass 5
Control Logic)
C BYPASS
470pF
(Optional)
The output voltage setting is determined by the values
of R1 and R2 (Figure 3-1). The ohmic values of these
resistors should be between 470K and 3M to minimize
bleeder current.
The output voltage setting is calculated using the
following equation.
EQUATION 3-1:
V OUT = V REF x
R2
[ R1 + 1 ]
The voltage adjustment range of the TC1174 is from
V REF to (V IN – 0.05V).
DS21363B-page 4
2002 Microchip Technology Inc.
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| TC117A | 制造商:Thomas & Betts 功能描述:2 1/2" CONN,COMP.,EMT,STL 制造商:Thomas & Betts 功能描述:Fittings Connector 2.5inch Steel |
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| TC1185-1.8VCT713 | 功能描述:低压差稳压器 - LDO 150mA LDO w/Shtdn RoHS:否 制造商:Texas Instruments 最大输入电压:36 V 输出电压:1.4 V to 20.5 V 回动电压（最大值）:307 mV 输出电流:1 A 负载调节:0.3 % 输出端数量: 输出类型:Fixed 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-20 |
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