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參數(shù)資料
| 型號(hào)： | TC1269-50VUA |
| 廠商： | Microchip Technology Inc. |
| 英文描述： | 300mA CMOS LDO with Shutdown and VREF Bypass |
| 中文描述： | 300mA的CMOS LDO穩(wěn)壓器具有關(guān)斷和VREF繞道 |
| 文件頁(yè)數(shù)： | 4/12頁(yè) |
| 文件大小： | 432K |
| 代理商： | TC1269-50VUA |
TC1269
DS21380B-page 4
2002 Microchip Technology Inc.
3.0
DETAILED DESCRIPTION
The TC1269 is a precision regulator available in fixed
voltages. Unlike the bipolar regulators, the TC1269
supply current does not increase with load current. In
addition, V
OUT
remains stable and within regulation
over the entire 0mA to I
OUT
operating load current
range, (an important consideration in RTC and CMOS
RAM battery backup applications).
Figure 3-1 shows a typical application circuit. The
regulator is enabled any time the shutdown input
(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.
FIGURE 3-1:
TYPICAL APPLICATION
CIRCUIT
3.1
Bypass Input
A 470pF capacitor connected from the Bypass input to
ground
reduces
noise
present
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.
on
the
internal
3.2
Output Capacitor
A 1
μ
F (min) capacitor from V
OUT
to ground is
recommended. The output capacitor should have an
effective series resistance greater than 0.1
and less
than 5.0
, and a resonant frequency above 1MHz. 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 electrolytic capacitors freeze at approxi-
mately -30°C, solid tantalums are recommended for
applications operating below -25°C.) When operating
from
sources
other
than
rejection and transient response can be improved by
increasing the value of the input and output capacitors
and employing passive filtering techniques.
batteries,
supply-noise
TC1269
1
2
3
4
6
7
8
NC
NC
GND
Bypass
NC
SHDN
Battery
V
OUT
V
OUT
C
470pF
(Optional)
Shutdown Control
(from Power
Control Logic)
C1
1
μ
F
V
IN
+
C1
1
μ
F
+
+
–
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