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參數(shù)資料
| 型號： | TC1073-2.85VCH713 |
| 元件分類： | 固定正電壓單路輸出LDO穩(wěn)壓器 |
| 英文描述： | 2.85 V FIXED POSITIVE LDO REGULATOR, 0.25 V DROPOUT, PDSO6 |
| 封裝： | PLASTIC, SOT-23, 6 PIN |
| 文件頁數(shù)： | 4/22頁 |
| 文件大小： | 713K |
| 代理商： | TC1073-2.85VCH713 |
TC1072/TC1073
DS21354D-page 12
2007 Microchip Technology Inc.
4.0
DETAILED DESCRIPTION
The TC1072 and TC1073 are precision fixed output
voltage regulators. (If an adjustable version is desired,
please see the TC1070/TC1071/TC1187 data sheet.)
Unlike bipolar regulators, the TC1072 and TC1073’s
supply current does not increase with load current. In
addition, VOUT remains stable and within regulation
over the entire 0 mA to IOUTMAX load current range, (an
important consideration in RTC and CMOS RAM
battery back-up applications).
Figure 4-1 shows a typical application circuit. The
regulator is enabled any time the shutdown input
(SHDN) is at or above VIH, and shutdown (disabled)
when SHDN is at or below VIL. 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 A
(typical), VOUT falls to zero volts, and ERROR is open-
circuited.
FIGURE 4-1:
Typical Application Circuit.
4.1
ERROR Open-Drain Output
ERROR is driven low whenever VOUT falls out of
regulation by more than –5% (typical). This condition
may be caused by low input voltage, output current
limiting, or thermal limiting. The ERROR output voltage
value (e.g. ERROR =VOL at 4.75V (typical) for a 5.0V
regulator and 2.85V (typical) for a 3.0V regulator).
ERROR output operation is shown in Figure 4-2.
Note that ERROR is active tDELAY (typically, 2.5 s)
after VOUT falls to VTH, and inactive when VOUT rises
above VTH by VHYS.
As shown in Figure 4-1, ERROR can be used as a
battery low flag, or as a processor RESET signal (with
the addition of timing capacitor C2). R1 x C2 should be
chosen to maintain ERROR below VIH of the processor
RESET input for at least 200 ms to allow time for the
system to stabilize. Pull-up resistor R1 can be tied to
VOUT, VIN or any other voltage less than (VIN + 0.3V).
FIGURE 4-2:
Error Output Operation.
4.2
Output Capacitor
A 1 F (minimum) capacitor from VOUT to ground is
recommended. The output capacitor should have an
effective series resistance greater than 0.1
Ω and less
than 5.0
Ω, and a resonant frequency above 1 MHz. A
1 F capacitor should be connected from VIN 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
approximately
-30°C,
solid
tantalums
are
recommended for applications operating below -25°C.)
When operating from sources 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.
4.3
Bypass Input
A 470 pF 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.
TC1072
TC1073
VOUT
SHDN
GND
ERROR
1
μF
C1
+
VIN
VOUT
Shutdown Control
(to CMOS Logic or Tie
to VIN if unused)
1
μF
+
Battery
+
0.2
μF
C2
C2 Required Only
if ERROR is used as a
Processor RESET Signal
(See Text)
R1
1M
V+
BATTLOW
or RESET
Bypass
C3, 470 pF
VTH
VOUT
ERROR
VIH
VOL
HYSTERESIS (VH)
tDELAY
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| TC1073-28VCH | 制造商:MICROCHIP 制造商全稱:Microchip Technology 功能描述:50mA and 100mA CMOS LDOs with Shutdown, ERROR Output and VREF Bypass |
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