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參數(shù)資料
| 型號： | TC1224-XXVCT |
| 廠商： | Microchip Technology Inc. |
| 英文描述： | 50mA and 100mA CMOS LDOs with Shutdown |
| 中文描述： | 為50mA和100mA的CMOS低壓降穩(wěn)壓器，帶有關斷 |
| 文件頁數(shù)： | 4/14頁 |
| 文件大小： | 487K |
| 代理商： | TC1224-XXVCT |
TC1223/TC1224
DS21368B-page 4
2002 Microchip Technology Inc.
3.0
DETAILED DESCRIPTION
The TC1223 and TC1224 are precision fixed output
voltage regulators. Unlike bipolar regulators, the
TC1223 and TC1224’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).
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 micro-
controller. If the SHDNinput is not required, it should be
connected directly to the input supply. While in
shutdown, supply current decreases to 0.05
μ
A (typical)
and V
OUT
falls to zero volts.
FIGURE 3-1:
TYPICAL APPLICATION
CIRCUIT
3.1
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
TC1223
TC1224
V
OUT
SHDN
GND
NC
1
μ
F
+
V
IN
V
OUT
Shutdown Control
(to CMOS Logic or Tie
to V
IN
if unused)
1
μ
F
+
Battery
+
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