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PDF TC1037 Data sheet ( Hoja de datos )
| Número de pieza | TC1037 | |
| Descripción | Single Comparator in SOT Packages | |
| Fabricantes | Microchip Technology | |
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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
1 page  
TC1037/TC1038/TC1039
3.0 DETAILED DESCRIPTION
The TC1037/TC1038/TC1039 are a series of very low
power, linear building block products targeted at low
voltage, single supply applications. The TC1037/
TC1038/TC1039 minimum operating voltage is 1.8V
and typical supply current is only 4µA for the TC1037
and TC1038 (fully enabled) and 6µA for the TC1039.
3.1 Comparator
The TC1037/8/9 contain one comparator. The
comparator’s input range extends beyond both supply
voltages by 200mV and the outputs will swing to within
several millivolts of the supplies depending on the load
current being driven.
The comparator exhibits a propagation delay and
supply current which is largely independent of supply
voltage. The low input bias current and offset voltage
makes it suitable for high impedance precision
applications.
The TC1038 comparator is disabled during shutdown
and has a high impedance output.
3.2 Voltage Reference
A 2.0% tolerance, internally biased, 1.20V bandgap
voltage reference is included in the TC1039. It has a
push-pull output capable of sourcing and sinking at
least 50µA.
3.3 Shutdown Input (TC1038 Only)
SHDN at VIL disables the comparator and reduces the
supply current to less than 0.3µA. The SHDN input
cannot be allowed to float. When not used, connect it to
VDD. The comparator’s output is in a high impedance
state when the TC1038 is disabled. The comparator’s
inputs can be driven from rail-to-rail by an external
voltage when the TC1038 is disabled. No latchup will
occur when the device is driven to its enabled state
when SHDN is set to VIH.
4.0 TYPICAL APPLICATIONS
The TC1037/TC1038/TC1039 family lends itself to a
wide variety of applications, particularly in battery
powered systems. It typically finds application in power
management, processor supervisory and interface
circuitry.
4.1 External Hysteresis (Comparator)
Hysteresis can be set externally with two resistors
using positive feedback techniques (see Figure 4-1).
The design procedure for setting external comparator
hysteresis is as follows:
1. Choose the feedback resistor RC. Since the
input bias current of the comparator is at most
100pA, the current through RC can be set to
100nA (i.e., 1000 times the input bias current)
and retain excellent accuracy. The current
through RC at the comparator’s trip point is VR /
RC where VR is a stable reference voltage.
2. Determine the hysteresis voltage (VHY) between
the upper and lower thresholds.
3. Calculate RA as follows:
EQUATION 4-1:
RA
=
RC
-V----H----Y-
V D D
4. Choose the rising threshold voltage for VSRC
(VTHR).
5. Calculate RB as follows:
EQUATION 4-2:
RB = ----------------------------1------------------------------
----V----T----H---R------
VR × RA
–---1----
RA
–
---1----
RC
6. Verify the threshold voltages with these
formulas:
VSRC rising:
EQUATION 4-3:
VTHR
=
(VR)(RA)
--1-----
RA
+
---1----
RB
+
---1----
RC
VSRC falling:
EQUATION 4-4:
VTHF = VTHR –
R-----A----×-----V----D----D--
RC
© 2002 Microchip Technology Inc.
DS21344B-page 5
5 Page 
TC1037/TC1038/TC1039
5.0 TYPICAL CHARACTERISTICS (CONTINUED)
Reference Voltage
vs. Supply Voltage
1.25
1.20
1.15
1.10
Supply Current vs. Supply Voltage
3
TC1037, TC1038
TA = 85°C
Supply Current vs. Supply Voltage
5
TC1039
TA = 85°C
2
TA = -40°C
4
TA = -40°C
TA = 25°C
TA = 25°C
13
1.05
1
2 34
SUPPLY VOLTAGE (V)
5
0
0 1 2 3 456
SUPPLY VOLTAGE (V)
2
0 1 2 3 456
SUPPLY VOLTAGE (V)
© 2002 Microchip Technology Inc.
DS21344B-page 11
11 Page | ||
| Páginas | Total 18 Páginas | |
| PDF Descargar | [ Datasheet TC1037.PDF ] | |
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