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TC2054 Datasheet(PDF) 4 Page - Microchip Technology

Part No. TC2054
Description  50mA, 100mA, and 150mA CMOS LDOs with Shutdown and Error Output
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Maker  MICROCHIP [Microchip Technology]
Homepage  http://www.microchip.com
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TC2054 Datasheet(HTML) 4 Page - Microchip Technology

 
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TC2054/2055/2186
DS21663B-page 4
© 2002 Microchip Technology Inc.
3.0
DETAILED DESCRIPTION
The TC2054, TC2055 and TC2186 are precision fixed
output voltage regulators. (If an adjustable version is
desired, please see the TC1070, TC1071 or TC1187
data sheets.) Unlike bipolar regulators, the TC2054,
TC2055 and TC2186 supply current does not increase
with load current. In addition, V
OUT remains stable and
within regulation over the entire 0mA to maximum out-
put current operating load range.
Figure 3-1 shows a typical application circuit. The reg-
ulator is enabled any time the shutdown input (SHDN)
is at or above VIH, and shutdown (disabled) when
SHDN is at or below VIL. SHDN maybecontrolled bya
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
µA(typical), VOUT falls to
zero volts, and ERROR is open-circuited.
FIGURE 3-1:
TYPICAL APPLICATION CIRCUIT
3.1
ERROR Open Drain Output
ERROR is driven low whenever VOUT falls out of regu-
lation by more than -5% (typical). This condition may be
caused by low input voltage, output current limiting or
thermal limiting. The ERROR threshold is 5% below
rated VOUT regardless of the programmed output volt-
age value (e.g. ERROR =VOL at 4.75V (typ.) for a 5.0V
regulator and 2.85V (typ.) for a 3.0V regulator).
ERROR output operation is shown in Figure 4-2.
Note that ERROR is active when VOUT falls to VTH,and
inactive when VOUT rises above VTH by VHYS.
As shown in Figure 3-1, ERROR can be used as a bat-
tery 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 200msec 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).
The ERROR pin sink current is self-limiting to approxi-
mately 18mA.
FIGURE 3-2:
ERROR OUTPUT OPERATION
3.2
Output Capacitor
A1
µF(min) capacitor from VOUT to ground is required.
The output capacitor should have an effective series
resistance of 0.01
Ω.to 5Ω for VOUT = 2.5V, and 0.05Ω.
to 5
Ω for VOUT <2.5V. A1µF capacitor should be con-
nected from VIN to GND if there is more than 10 inches
of wire between the regulator and the AC filter capaci-
tor, or if a battery is used as the power source. Ceramic,
tantalum and aluminum electrolytic capacitors can be
used. (Since many aluminum electrolytic capacitors
freeze at approximately -30°C, solid tantalums are rec-
ommended for applications operating below -25°C).
When operating from sources other than batteries, sup-
ply-noise rejection and transient response can be
improved by increasing the value of the input and out-
put capacitors and employing passive filtering tech-
niques.
1µF
C1
0.2µF
C2
R1
1M
V+
C2 Required Only
if ERROR is used as a
Processor RESET Signal
(See Text)
Shutdown Control
(to CMOS Logic or Tie
to V
IN if unused)
BATTLOW
or RESET
TC2054
TC2055
TC2186
VIN
BATTERY
VOUT
ERROR
SHDN
GND
VOUT
1µF
VIH
VOL
ERROR
V
TH
V
OUT
HYSTERESIS (V
HYS)


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