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부품번호 | TC1037 기능 |
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기능 | Single Comparator in SOT Packages | ||
제조업체 | Microchip Technology | ||
로고 | |||
전체 18 페이지수
TC1037/TC1038/TC1039
Linear Building Block – Single Comparator in SOT Packages
Features
• Tiny SOT-23A Packages
• Optimized for Single Supply Operation
• Ultra Low Input Bias Current: Less than 100pA
• Low Quiescent Current: 4µA (TC1037),
Shutdown Mode: 4µA, 0.05µA (TC1038),
6µA (TC1039)
• Shutdown Mode (TC1038)
• 2.0% Accurate Independent Voltage Reference
(TC1039)
• Rail-to-Rail Inputs and Outputs
• Operation Down to VDD = 1.8V
Applications
• Power Management Circuits
• Battery Operated Equipment
• Consumer Products
Device Selection Table
Part Number
TC1037CECT
TC1038CECH
TC1039CECH
Package
5-Pin SOT-23A
6-Pin SOT-23A
6-Pin SOT-23A
Temperature
Range
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
Package Types
5-Pin SOT-23A
VDD
IN-
54
6-Pin SOT-23A
VDD SHDN IN-
6 54
TC1037ECT
TC1038ECH
1 23
1 23
OUTPUT VSS IN+
OUTPUT VSS IN+
6-Pin SOT-23A
VDD REF IN-
6 54
TC1039ECH
1 23
OUTPUT VSS IN+
NOTE: 5-Pin SOT-23A is equivalent to the EIAJ SC-74A.
6-Pin SOT-23A is equivalent to the EIAJ SC-74.
General Description
The TC1037/TC1038/TC1039 are single, low-power
comparators designed for low-power applications.
These comparators are specifically designed for
operation from a single supply. However, operation
from dual supplies also is possible, and power supply
current is independent of the magnitude of the power
supply voltage. The TC1037/TC1038/TC1039 operate
from two 1.5V alkaline cells down to VDD = 1.8V. Active
supply current is 4µA for the TC1037/TC1038 and 6µA
for the TC1039. Input and output swing of these
devices is rail-to-rail.
An active low shutdown input, SHDN, is available on
the TC1038 and disables the comparator, placing its
output in a high-impedance state. The TC1038 draws
only 0.05µA (typical) when the shutdown mode is
active.
An internally biased 1.20V bandgap reference is
included in the TC1039. The reference is accurate to
2.0 percent tolerance. This reference is independent of
the comparator in the TC1039.
Packaged in a 5-Pin SOT-23A (TC1037) or 6-Pin
SOT-23A (TC1038/TC1039), these single comparators
are ideal for applications requiring high integration,
small size and low power.
Functional Block Diagram
OUTPUT
VSS
IN+
1
2
3
5 VDD
–
TC1037
4 IN-
OUTPUT
VSS
IN+
1
2
3
–
TC1038
6 VDD
5 SHDN
4
IN-
OUTPUT
VSS
IN+
1
2
3
Voltage
6 VDD
Reference
– 5 REF
4
IN-
TC1039
© 2002 Microchip Technology Inc.
DS21344B-page 1
TC1037/TC1038/TC1039
2.0 PIN DESCRIPTIONS
The description of the pins are listed in Table 2-1.
TABLE 2-1: PIN FUNCTION TABLE
Pin No.
TC1037
(5-Pin SOT-23A)
1
2
3
4
5
Symbol
OUTPUT
VSS
IN+
IN-
VDD
Comparator output.
Negative power supply.
Comparator non-inverting input.
Comparator inverting input.
Positive power supply.
Description
Pin No.
TC1038
(6-Pin SOT-23A)
1
2
3
4
5
6
Symbol
Description
OUTPUT
VSS
IN+
IN-
SHDN
VDD
Comparator output.
Negative power supply.
Comparator non-inverting input.
Comparator inverting input.
Active low shutdown input (TC1038 only). A low input on this pin disables the comparator
and places the output terminal in a high impedance state.
Positive power supply.
Pin No.
TC1039
(6-Pin SOT-23A)
1
2
3
4
5
6
Symbol
Description
OUTPUT
VSS
IN+
IN-
REF
VDD
Comparator output.
Negative power supply.
Comparator non-inverting input.
Comparator inverting input.
1.20V bandgap voltage reference output (TC1039 only).
Positive power supply.
DS21344B-page 4
© 2002 Microchip Technology Inc.
4페이지 TC1037/TC1038/TC1039
Capacitor C1 will charge up through R4. When the
voltage of the comparator's inverting input is equal to
VH, the comparator output will switch. With the output
at ground potential, the value at the non-inverting input
terminal (VL) is reduced by the hysteresis network to a
value given by:
EQUATION 4-7:
VL
=
-V----D---D--
3
Using the same resistors as before, capacitor C1 must
now discharge through R4 toward ground. The output
will return to a high state when the voltage across the
capacitor has discharged to a value equal to VL. The
period of oscillation will be twice the time it takes for the
RC circuit to charge up to one half its final value. The
period can be calculated from:
EQUATION 4-8:
--------1---------
FREQ
=
2(0.694 )(R4)(C1)
The frequency stability of this circuit should only be a
function of the external component tolerances.
Figure 4-6 shows the circuit for a pulse width modulator
circuit. It is essentially the same as in Figure 4-5 with
the addition of an input control voltage. When the input
control voltage is equal to one-half VDD, operation is
basically the same as described for the free-running
oscillator. If the input control voltage is moved above or
below one-half VDD, the duty cycle of the output square
wave will be altered. This is because the addition of the
control voltage at the input has now altered the trip
points. The equations for these trip points are shown in
Figure 4-6 (see VH and VL).
Pulse width sensitivity to the input voltage variations
can be increased by reducing the value of R6 from
10KΩ and conversely, sensitivity will be reduced by
increasing the value of R6. The values of R1 and C1
can be varied to produce the desired center frequency.
FIGURE 4-1:
TC1037
VSRC
RA
RB
COMPARATOR
EXTERNAL HYSTERESIS
CONFIGURATION
RC
VDD
+
VOUT
–
VR
FIGURE 4-2:
PRECISION BATTERY MONITOR
To System DC/DC
Converter
VDD
TC1034
+
AMP1
–
R2, 330k, 1%
R4, 470k, 1%
R5, 7.5M
VDD
+
CMPTR1
–
TC1037
BATTLOW
3V
Alkaline
+
TC1039
R1, 270k, 1%
VR
VDD
TC1039
–
CMPTR2
+
BATTFAIL
R6, 7.5M
R3, 470k, 1%
© 2002 Microchip Technology Inc.
DS21344B-page 7
7페이지 | |||
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DataSheet.kr | 2020 | 연락처 | 링크모음 | 검색 | 사이트맵 |