TC105503ECTTR Microchip Technology, TC105503ECTTR Datasheet - Page 9

• Manufacturer Part Number: TC105503ECTTR
• Description: IC PFM/PWM CONTRLLER 5V SOT23A-5
• Manufacturer: Microchip Technology
• Type: Step-Down (Buck)r

Specifications of TC105503ECTTR

• Internal Switch(s): No
• Synchronous Rectifier: No
• Number Of Outputs: 1
• Voltage - Output: 5V
• Current - Output: 1A
• Frequency - Switching: 300kHz
• Voltage - Input: 0.9 ~ 2.2 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: SOT-23-5, SC-74A, SOT-25
• Power - Output: 150mW
• Output Current: 100 mA
• Mounting Style: SMD/SMT
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

4.0
The TC1054, TC1055 and TC1186 are precision fixed
output voltage regulators (If an adjustable version is
desired, please see the TC1070/TC1071/TC1187 data
sheet (DS21353)). Unlike bipolar regulators, the
TC1054, TC1055 and TC1186 supply current does not
increase with load current.
Figure 4-1 shows a typical application circuit, where the
regulator is enabled any time the shutdown input
(SHDN) is at or above V
when SHDN is at or below V
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 µA
(typical), V
circuited.
FIGURE 4-1:
(to CMOS Logic or Tie
Shutdown Control
2003 Microchip Technology Inc.
to V
IN
if unused)
DETAILED DESCRIPTION
Battery
OUT
+
falls to zero volts, and ERROR is open-
Processor RESET Signal
+
if ERROR is used as a
1 µF
C
2
Required Only
(See Text)
GND
SHDN
V
IN
TC1054
TC1055
Typical Application Circuit.
TC1186
IH
ERROR
, and shutdown (disabled)
V
OUT
IL
. SHDN may be
V+
+
1MW
0.2 µF
C
R
1 µF
C
2
1
1
V
OUT
BATTLOW
or RESET
TC1054/TC1055/TC1186
4.1
ERROR is driven low whenever V
regulation 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 V
put voltage value (e.g. ERROR = V
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 V
inactive when V
As shown in Figure 4-1, ERROR can be used either as
a battery low flag or as a processor RESET signal (with
the addition of timing capacitor C
chosen to maintain ERROR below V
RESET input for at least 200 msec to allow time for the
system to stabilize. Pull-up resistor R
V
FIGURE 4-2:
4.2
A 1 µF (min) capacitor from V
recommended. The output capacitor should have an
effective series resistance greater than 0.1
than 5.0 , with a resonant frequency above 1 MHz. A
1 µF capacitor should be connected from V
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 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.
OUT
ERROR
V
OUT
V
V
V
, V
TH
OL
IH
IN
ERROR Open-Drain Output
Output Capacitor
or any other voltage less than (V
OUT
OUT
, regardless of the programmed out-
rises above V
Error Output Operation.
2
TH
). R
OL
OUT
OUT
IH
by V
HYSTERESIS (V
at 4.75V (typ.) for
OUT
DS21350C-page 9
1
1
of the processor
falls to V
x C
can be tied to
to ground is
HYS
falls out of
IN
2
IN
should be
.
+ 0.3V).
to GND if
and less
TH
H
and
)