TP2021U [3PEAK]
SC70, 1.8V, Nano-power Comparators with Voltage Reference;型号: | TP2021U |
厂家: | 3PEAK |
描述: | SC70, 1.8V, Nano-power Comparators with Voltage Reference |
文件: | 总20页 (文件大小:501K) |
中文: | 中文翻译 | 下载: | 下载PDF数据表文档文件 |
TP2021/TP2025
SC70, 1.8V, Nano-power Comparators with Voltage Reference
Features
Description
The TP2021 has a push-pull output stage with loads
up to 25mA. The TP2025 has an open-drain output
stage that makes it suitable for mixed-voltage
Ultra-Low Supply Current:
390 nA Comparator with Reference
system design. Both feature an on-chip 1.248V
±1.8% reference and draw an ultra-low supply
current of only 440nA (max). The TP202x
incorporate 3PEAK’s proprietary and patented
design techniques to achieve the best world-class
performance among all nano-power comparators.
Both have 13μs fast response time under 1.8V to
5.5V supply. The internal input hysteresis eliminates
output switching due to internal input noise voltage,
reducing current draw. They have input
common-mode range 200mV beyond the supply
rails, and operate down to +1.8V. The integrated
1.248V voltage reference offers low 120ppm/°C drift,
is stable with up to 10nF capacitive load, and can
provide up to 25mA of output current. These
features make the TP202x ideal for all 2-Cell Battery
Monitoring/Management.
Internal 1.248V ± 1.8% Reference @ VDD =5V
Fast Response Time: 13 μs Propagation Delay,
with 100 mV Overdrive
Internal Hysteresis for Clean Switching
Offset Voltage: ± 2.0 mV Maximum
Offset Voltage Temperature Drift: 0.3 μV/°C
Input Bias Current: 6 pA Typical
Input Common-Mode Range Extends 200 mV
Push-Pull Output with ±25 mA Drive Capability
Open-Drain Output Version Available: TP2025
No Phase Reversal for Overdriven Inputs
Low Supply Voltage: 1.8V to 5.5V
Green, Space-Saving SC70/SOT23 Package
The TP202x is available in the tiny SC70/SOT23
package for space-conservative designs. Both
versions are specified for the temperature range of
–40°C to +85°C.
Applications
Battery Monitoring / Management
Alarm and Monitoring Circuits
Threshold Detectors/Discriminators
Sensing at Ground or Supply Line
Oscillators and RC Timers
3PEAK and the 3PEAK logo are registered trademarks of
3PEAK INCORPORATED. All other trademarks are the property
of their respective owners.
Mobile Communications and Notebooks
Ultra-Low-Power Systems
Related Products
VBattery
DEVICE
DESCRIPTION
Fast 68ns, 1.8V Low Power (46µA), Internal Hysteresis,
±3mV Maximum VOS, – 0.2V to VDD + 0.2V RRI, Push-
Pull (CMOS/TTL) Output Comparators
(1)
TP1941/TP1941N
/TP1942/TP1944
Load
RPU
TP2021
Fast 68ns, 1.8V Low Power (46µA), Internal Hysteresis,
±3mV Maximum VOS, – 0.2V to VDD + 0.2V RRI, Open-
Drain Output Comparators
TP1945/TP1945N
/TP1946/TP1948
Battery
Ref
R1
R2
TP1931
/TP1932/TP1934
950ns, 3µA, 1.8V, ±2.5mV VOS-MAX, – 0.2V to VDD + 0.2V
RRI, Internal Hysteresis, Push-Pull Output Comparators
Rsense
TP1935
/TP1936/TP1938
950ns, 3µA, 1.8V, ±2.5mV VOS-MAX, – 0.2V to VDD + 0.2V
RRI, Internal Hysteresis, Open-Drain Comparators
Ultra-low 200nA, 13µs, 1.6V, ±2mV Maximum VOS
Internal Hysteresis, – 0.2V to VDD + 0.2V RRI, Push-Pull
(CMOS/TTL) Output Comparators
,
TP2011
/TP2012/TP2014
NOTE: (1) Use RPU with the TP2025
Ultra-low 200nA, 13µs, 1.6V, ±2mV Maximum VOS
Internal Hysteresis, – 0.2V to VDD + 0.2V RRI, Open-
Drain Output Comparators
,
TP2015
/TP2016/TP2018
TP2021 in Low-Side Current Sensing
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1
TP2021/TP2025
SC70, 1.8V, Nano-power Comparators with Voltage Reference
Pin Configuration (Top View)
Order Information
Marking
Information
Model Name
Order Number
Package
Transport Media, Quantity
TP2021-TR
TP2021-CR
TP2021-SR
TP2021U-TR
TP2021U-SR
TP2021U2-TR
TP2025-TR
TP2025-CR
TP2025-SR
TP2025U-TR
TP2025U-SR
TP2025U2-TR
6-Pin SOT23
6-Pin SC70
8-Pin SOIC
5-Pin SOT23
8-Pin SOIC
6-Pin SOT23
6-Pin SOT23
6-Pin SOT23
8-Pin SOIC
5-Pin SOT23
8-Pin SOIC
6-Pin SOT23
Tape and Reel, 3000
Tape and Reel, 3000
Tape and Reel, 4000
Tape and Reel, 3000
Tape and Reel, 4000
Tape and Reel, 3000
Tape and Reel, 3000
Tape and Reel, 3000
Tape and Reel, 4000
Tape and Reel, 3000
Tape and Reel, 4000
Tape and Reel, 3000
C2TYW (1)
C2CYW (1)
2021S
TP2021
C2UYW (1)
TP2021U
2021US
TP2021U2
C2VYW (1)
CT2YW (1)
CC2YW (1)
2025S
TP2025
CU2YW (1)
TP2025U
2025US
CV2YW (1)
TP2025U2
Note (1): ‘YW’ is date coding scheme. 'Y' stands for calendar year, and 'W' stands for single workweek coding scheme.
REV1.3
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TP2021/TP2025
SC70, 1.8V, Nano-power Comparators with Voltage Reference
Note 1
Absolute Maximum Ratings
Supply Voltage: V+ – V–....................................6.0V
Input Voltage............................. V– – 0.3 to V+ + 0.3
Input Current: +IN, –IN, Note 2..........................±10mA
Output Current: OUT.................................... ±25mA
Output Short-Circuit Duration Note 3…......... Indefinite
Operating Temperature Range.........–40°C to 85°C
Maximum Junction Temperature................... 150°C
Storage Temperature Range.......... –65°C to 150°C
Lead Temperature (Soldering, 10 sec) ......... 260°C
Note 1: Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. Exposure to any
Absolute Maximum Rating condition for extended periods may affect device reliability and lifetime.
Note 2: The inputs are protected by ESD protection diodes to each power supply. If the input extends more than 500mV beyond the power
supply, the input current should be limited to less than 10mA.
Note 3: A heat sink may be required to keep the junction temperature below the absolute maximum. This depends on the power supply voltage
and how many amplifiers are shorted. Thermal resistance varies with the amount of PC board metal connected to the package. The specified
values are for short traces connected to the leads.
ESD, Electrostatic Discharge Protection
Symbol
HBM
Parameter
Human Body Model ESD
Charged Device Model ESD
Condition
Minimum Level
Unit
kV
kV
ANSI/ESDA/JEDEC JS-001
ANSI/ESDA/JEDEC JS-002
2
1
CDM
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TP2021/TP2025
SC70, 1.8V, Nano-power Comparators with Voltage Reference
Electrical Characteristics
The ● denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 27°C.
VDD = +1.8V to +5.5V, VIN+ = VDD, VIN- = 1.2V, RPU=10kΩ, CL =15pF.
SYMBOL PARAMETER
CONDITIONS
MIN
1.8
TYP
MAX
5.5
UNITS
V
VDD
VOS
Supply Voltage
●
Input Offset Voltage Note 1
VCM = 1.2V
-2.0
0.5
+2.0
mV
VOS TC
VHYST
VHYST TC
IB
Input Offset Voltage Drift Note 1
Input Hysteresis Voltage Note 1
Input Hysteresis Voltage Drift Note 1
Input Bias Current
VCM = 1.2V
VCM = 1.2V
VCM = 1.2V
VCM = 1.2V
VCM = 1.2V
0.3
μV/°C
mV
μV/°C
pA
3
4
20
6
7
IOS
Input Offset Current
4
pA
RIN
Input Resistance
> 100
2
4
GΩ
Differential
Common Mode
VCM = VSS to VDD
CIN
Input Capacitance
pF
dB
V
CMRR
VCM
Common Mode Rejection Ratio
Common-mode Input Voltage
Range
50
V–
82
●
V+
PSRR
VOH
VOL
ISC
Power Supply Rejection Ratio
High-Level Output Voltage
Low-Level Output Voltage
Output Short-Circuit Current
Quiescent Current per Comparator
60
VDD-0.3
90
dB
V
V
mA
nA
V
IOUT=-1mA
IOUT=1mA
Sink or source current
●
●
VSS+0.3
25
390
1.248
1.224
150
1.45
0.13
5
IQ
●
440
1.272
1.246
VDD = 5V
1.225
1.202
VOUT
Reference Voltage
VDD = 3V
V
VOUT TC
VOUT LC
Reference Voltage Drift
μV/°C
μV/μA
μV/μA
ns
0μA≤Isource≤400μA
0μA≤Isink≤400μA
Reference
Regulation
Voltage
Load
tR
tF
Rising Time Note 2
Falling Time
5
ns
tPD+
tPD-
TPD-SKEW
Propagation Delay (Low-to-High)
Propagation Delay (High-to-Low)
Propagation Delay Skew Note 3
Overdrive=100mV, VIN- =1.2V
Overdrive=100mV, VIN- =1.2V
Overdrive=100mV, VIN- =1.2V
13
14
1
19
18
5
μs
μs
μs
Note 1: The input offset voltage is the average of the input-referred trip points. The input hysteresis is the difference between the input-referred
trip points.
Note 2: For TP2025/TP2025U, tR dependent on RPU and CL-.
Note 3: Propagation Delay Skew is defined as: tPD-SKEW = tPD+ - tPD-
.
REV1.3
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TP2021/TP2025
SC70, 1.8V, Nano-power Comparators with Voltage Reference
Typical Performance Characteristics
Input Offset Voltage vs. Temperature
Input Hysteresis Voltage vs. Temperature
5
10
8
2.5
5V
6
0
-2.5
-5
5V
4
2
0
1.8V
1.8V
VCM=1.2V
-25
VCM=1.2V
-25
-50
0
25
50
75
100
-50
0
25
50
75
100
TEMPERATURE (
)
TEMPERATURE (
)
℃
℃
Quiescent Current vs. Temperature
Propagation Delay vs. Temperature
1000
25
20
15
10
5
tpd-@VDD=5V
tpd+@VDD=5V
800
600
400
200
0
5V
tpd-@VDD=1.8V
tpd+@VDD=1.8V
1.8V
VCM=1.2V
-50 -25
VCM=1.2V
-50
0
0
25
50
75
100
0
50
100
TEMPERATURE (
)
℃
TEMPERATURE (
)
℃
Propagation Delay Skew vs. Temperature
Reference Voltage vs. Temperature
8
1.3
1.28
1.26
1.24
1.22
1.2
4
5V
5V
0
-4
1.8V
1.8V
VCM=1.2V
-8
-50
0
50
100
-50
-25
0
25
50
75
100
TEMPERATURE (
)
TEMPERATURE (
)
℃
℃
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TP2021/TP2025
SC70, 1.8V, Nano-power Comparators with Voltage Reference
Typical Performance Characteristics
Propagation Delay vs. Overdrive Voltage
Propagation Delay Skew vs. Overdrive Voltage
100
20
VDD=5V
VDD=5V
CM=2.5V
15
V
CM=2.5V
V
80
60
40
20
0
10
5
0
-5
tpd-
-10
-15
-20
tpd+
100
10
1V
10
100
Common Mode Voltage (mV)
1V
Common Mode Voltage (mV)
Propagation Delay vs. Overdrive Voltage
Propagation Delay Skew vs. Overdrive Voltage
100
20
VDD=1.8V
VDD=1.8V
CM=0.9V
15
V
CM=0.9V
V
80
60
40
20
0
10
5
0
-5
-10
-15
-20
tpd-
tpd+
10
100
Common Mode Voltage (mV)
1V
10
100
Common Mode Voltage (mV)
1V
Input Offset Voltage vs. Common Mode Voltage
Input Offset Voltage vs. Common Mode Voltage
5
5
2.5
0
2.5
0
-2.5
-2.5
VDD=5V
-5
VDD=1.8V
-5
0
1
2
3
4
5
0
0.5
1
1.5
2
Common Mode Voltage (V)
Common Mode Voltage (V)
REV1.3
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6
TP2021/TP2025
SC70, 1.8V, Nano-power Comparators with Voltage Reference
Typical Performance Characteristics
Input Hysteresis Voltage vs. Common Mode Voltage
Input Hysteresis Voltage vs. Common Mode Voltage
10
8
10
8
6
6
4
4
2
2
VDD=5V
0
VDD=1.8V
0
0
1
2
3
4
5
5
5
0
0.5
1
1.5
2
Common Mode Voltage (V)
Common Mode Voltage (V)
Quiescent Current vs. Common Mode Voltage
Quiescent Current vs. Common Mode Voltage
1000
800
600
400
200
1000
800
600
400
200
VDD=5V
0
VDD=1.8V
0
0
1
2
3
4
0
0.5
1
1.5
2
Common Mode Voltage (V)
Common Mode Voltage (V)
Propagation Delay vs. Common Mode Voltage
Propagation Delay vs. Common Mode Voltage
20
20
tpd+
15
15
tpd+
tpd-
10
10
tpd-
5
5
VDD=5V
0
VDD=1.8V
0
0
1
2
3
4
0
0.5
1
1.5
2
Common Mode Voltage (V)
Common Mode Voltage (V)
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TP2021/TP2025
SC70, 1.8V, Nano-power Comparators with Voltage Reference
Typical Performance Characteristics
Propagation Delay Skew vs. Common Mode Voltage
Propagation Delay Skew vs. Common Mode Voltage
5
5
2.5
0
2.5
0
-2.5
-2.5
VDD=5V
-5
VDD=1.8V
-5
0
1
2
3
4
5
0
0.5
1
1.5
2
Common Mode Voltage (V)
Common Mode Voltage (V)
Input Offset Voltage Distribution
Input Hysteresis Voltage Distribution
60%
50%
40%
30%
20%
10%
0%
60%
1462 Samples
DD=5V
CM=1.2V
1462 Samples
50%
40%
30%
20%
10%
0%
V
V
V
DD=5V
V
CM=1.2V
0
1
2
3
4
5
6
7
8
9 10 11 12
-6 -5 -4 -3 -2 -1
0
1
2
3
4
5
6
Input Offset Voltage (mV)
Input Hysteresis Voltage (mV)
Quiescent Current Distribution
Low to High Propagation Delay Distribution
35%
30%
25%
20%
15%
10%
5%
70%
1462 Samples
1462 Samples
60%
50%
40%
30%
20%
10%
0%
V
V
DD=5V
V
V
DD=5V
CM=1.2V
CM=1.2V
100mV overdrive
0%
350
370
390
410
430
450
470
12
14
16
18
20
22
24
Quiscent Current (nA)
Propagation Low to High Delay (μs)
REV1.3
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TP2021/TP2025
SC70, 1.8V, Nano-power Comparators with Voltage Reference
Typical Performance Characteristics
High to Low Propagation Delay Distribution
Propagation Delay Skew Distribution
45%
50%
1462 Samples
40%
1462 Samples
45%
40%
35%
30%
25%
20%
15%
10%
5%
V
V
DD=5V
V
V
DD=5V
35%
30%
25%
20%
15%
10%
5%
CM=1.2V
CM=1.2V
100mV overdrive
100mV overdrive
0%
0%
10
12
14
16
18
20
22
-2
0
2
4
6
8
10
Propagation High to Low Delay (μs)
Propagation Delay Skew (μs)
Reference Voltage Distribution
Reference Voltage vs. Supply Voltage
1.3
50%
45%
40%
35%
30%
25%
20%
15%
10%
5%
1462 Samples
DD=5V
1.28
1.26
1.24
1.22
1.2
V
Isinking
Isourcing
RREFLOAD=100kΩ
2
0%
1.20 1.22 1.24 1.26 1.28 1.30 1.32
Reference Voltage (mV)
1
3
4
5
Supply Voltage (V)
Reference Voltage vs. Reference Load Current
Reference Voltage vs. Reference Load Current
1.3
1.24
1.28
1.235
Isinking
Isinking
1.26
1.23
1.24
1.22
Isourcing
1.225
VDD=5V
Isourcing
VDD=1.8V
1.22
1.2
0
100
200
300
400
0
10
20
30
Reference Load Current, Sourcing (μA)
Reference Load Current, Sourcing (μA)
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TP2021/TP2025
SC70, 1.8V, Nano-power Comparators with Voltage Reference
Typical Performance Characteristics
Output Voltage Headroom vs. Output Load Current
Output Voltage Headroom vs. Output Load Current
5
2
VDD=5V
VDD=1.8V
4
1.5
Sourcing Current
3
Sourcing Current
1
2
Sinking Current
1
0.5
Sinking Current
0
0
0
5
10
15
0.0
0.5
1.0
1.5
2.0
Output Load Current (mA)
Output Load Current (mA)
Output Voltage Headroom vs. Supply Voltage
Output Short Current vs. Supply Voltage
400
30
25
300
20
Isinking
VOH
15
10
200
100
Isourcing
5
0
VOL
IOUT=±1mA
0
1
2
3
4
5
1
2
3
4
5
Supply Voltage (V)
Supply Voltage (V)
REV1.3
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TP2021/TP2025
SC70, 1.8V, Nano-power Comparators with Voltage Reference
Pin Functions
–IN: Inverting Input of the Comparator. Voltage range of
V–: Negative Power Supply. It is normally tied to ground.
It can also be tied to a voltage other than ground as long
as the voltage between V+ and V– is from 1.8V to 5.5V. If
it is not connected to ground, bypass it with a capacitor
of 0.1μF as close to the part as possible.
this pin can go from V– – 0.3V to V+ + 0.3V.
+IN: Non-Inverting Input of Comparator. This pin has the
same voltage range as –IN.
V+: Positive Power Supply. Typically the voltage is from
1.8V to 5.5V. Split supplies are possible as long as the
voltage between V+ and V– is between 1.8V and 5.5V.
A bypass capacitor of 0.1μF as close to the part as
possible should be used between power supply pins or
between supply pins and ground.
OUT: Comparator Output. The voltage range extends to
within millivolts of each supply rail.
Ref: Reference voltage output.
LATCH: Active Low Latch enable. Latch enable
threshold is 1/2 V+ above negative supply rail.
NC: No Connection.
Operation
The TP202x family single-supply comparators feature
internal hysteresis, internal reference, high speed, and
ultra-low power. Input signal range extends beyond the
negative and positive power supplies. The output can
even extend all the way to the negative supply. The
input stage is comprised of two CMOS differential
amplifiers, a PMOS stage and NMOS stage that are
active over different ranges of common mode input
voltage. Rail-to-rail input voltage range and low-voltage
single-supply operation make these devices ideal for
portable equipment.
Applications Information
Inputs
The TP202x comparator family uses CMOS transistors at the input which prevent phase inversion when the input pins
exceed the supply voltages. Figure 1 shows an input voltage exceeding both supplies with no resulting phase
inversion.
6
Input Voltage
4
1KΩ
+In
2
Core
1KΩ
-In
0
Output Voltage
VDD=5V
-2
Time (100μs/div)
Chip
Figure 1. Response time to Input Voltage
Figure 2. Equivalent Input Structure
The electrostatic discharge (ESD) protection input structure of two back-to-back diodes and 1kΩ series resistors are
used to limit the differential input voltage applied to the precision input of the comparator by clamping input voltages
that exceed supply voltages, as shown in Figure 2.
Large differential voltages exceeding the supply voltage should be avoided to prevent damage to the input stage.
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TP2021/TP2025
SC70, 1.8V, Nano-power Comparators with Voltage Reference
Internal Hysteresis
Most high-speed comparators oscillate in the linear region because of noise or undesired parasitic feedback. This
tends to occur when the voltage on one input is at or equal to the voltage on the other input. To counter the parasitic
effects and noise, the TP202x implements internal hysteresis.
The hysteresis in a comparator creates two trip points: one for the rising input voltage and one for the falling input
voltage. The difference between the trip points is the hysteresis. When the comparator’s input voltages are equal, the
hysteresis effectively causes one comparator input voltage to move quickly past the other, thus taking the input out of
the region where oscillation occurs. Figure 3 illustrates the case where IN- is fixed and IN+ is varied. If the inputs were
reversed, the figure would look the same, except the output would be inverted.
Vi
Vtr
Vi
Vtr
Vhyst=Vtr-Vtf
Vtr+V
Vhyst=Vtr-Vtf
Vtr+V
Hysteresis
Band
Hysteresis
Band
Vin-
Vin-
tf -Vin-
tf -Vin-
Vos=
2
Vos=
2
Vtf
Vtf
Time
Time
VDD
VDD
0
0
Non-Inverting Comparator Output
Inverting Comparator Output
Figure 3. Comparator’s hysteresis and offset
External Hysteresis
Greater flexibility in selecting hysteresis is achieved by using external resistors. Hysteresis reduces output chattering
when one input is slowly moving past the other. It also helps in systems where it is best not to cycle between high and
low states too frequently (e.g., air conditioner thermostatic control). Output chatter also increases the dynamic supply
current.
Non-Inverting Comparator with Hysteresis
A non-inverting comparator with hysteresis requires a two-resistor network, as shown in Figure 4 and a voltage
reference (Vr) at the inverting input.
VDD
VDD
VDD
R2
R2
R2
(1)
RPU
(1)
TP202x
RPU
Vo
R1
(1)
TP202x
RPU
R1
Vi
TP202x
R1
Vo
Vtr
Vr
V+=Vr
Vtf
Ref
V+=Vr
Vo
Ref
Ref
NOTE: (1) Use RPU with the TP2025/5U
Figure 4. Non-Inverting Configuration with Hysteresis
Consider the comparator of TP2021/TP2021U, when Vi is low, the output is also low. For the output to switch from low
to high, Vi must rise up to Vtr. When Vi is high, the output is also high. In order for the comparator to switch back to a
low state, Vi must equal Vtf before the non-inverting input V+ is again equal to Vr.
R
2
V
V
tr
r
R
R
2
1
R
1
V
(V
V
)
V
tf
r
DD
tf
R
1
R
2
REV1.3
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TP2021/TP2025
SC70, 1.8V, Nano-power Comparators with Voltage Reference
R
R
2
1
V
V
r
tr
R
2
R
R
R
1
1
2
V
V
V
DD
r
tf
R
R
2
2
R
1
V
V V
tf
V
DD
tr
hyst
R
2
As for the TP2025/TP2025U, a pull-up resistor should be placed between output and the supply. The formula for
calculating Vtf is slight difference with TP2021/TP2021U, so does the hysteresis voltage Vhyst
.
R
1
V
(V
DD
V
tf
)
V
r
tf
R
R
R
1
2
PU
R
R
R
R
1
1
2
PU
V
V
V
r
DD
tf
R
R
R
R
2
PU
2
PU
R
1
V
V
if RPU<<R2
DD
hyst
R
R
2
PU
Inverting Comparator with Hysteresis
The inverting comparator with hysteresis requires a two-resistor network that is referenced to the comparator supply
voltage (VDD), as shown in Figure 5.
Figure 5. Inverting Configuration with Hysteresis
Consider the comparator of TP2021/TP2021U, when Vi is greater than V+, the output voltage is low. In this case, the
three network resistors can be presented as paralleled resistor R2 || R3 in series with R1. When Vi at the inverting input
is less than V+, the output voltage is high. The three network resistors can be represented as R1 ||R3 in series with R2.
R
1
V
(V V ) V
DD
ref ref
tr
R
R
1
2
R
2
V
V
tf
ref
R
R
2
1
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13
TP2021/TP2025
SC70, 1.8V, Nano-power Comparators with Voltage Reference
R
1
V
V V
tf
V
tr
DD
hyst
R
R
2
1
As for the TP2025/TP2025U, a pull-up resistor should be placed between output and the supply. The formula for
calculating Vtr is slight difference with TP2021/TP2021U, so does the hysteresis voltage Vhyst
.
R
1
V
(V
DD
V ) V
ref ref
tr
R
R
R
PU
1
2
R
1
if RPU<<R2
V
V
DD
hyst
R
R
2
1
Low Input Bias Current
The TP202x family is a CMOS comparator family and features very low input bias current in pA range. The low input
bias current allows the comparators to be used in applications with high resistance sources. Care must be taken to
minimize PCB Surface Leakage. See below section on “PCB Surface Leakage” for more details.
PCB Surface Leakage
In applications where low input bias current is critical, Printed Circuit Board (PCB) surface leakage effects need to be
considered. Surface leakage is caused by humidity, dust or other contamination on the board. Under low humidity
conditions, a typical resistance between nearby traces is 1012Ω. A 5V difference would cause 5pA of current to flow,
which is greater than the TP202x’s input bias current at +27°C (±6pA, typical). It is recommended to use multi-layer
PCB layout and route the comparator’s -IN and +IN signal under the PCB surface.
The effective way to reduce surface leakage is to use a guard ring around sensitive pins (or traces). The guard ring is
biased at the same voltage as the sensitive pin. An example of this type of layout is shown in Figure 6. for Inverting
configuration application.
1. For Non-Inverting Configuration:
a) Connect the non-inverting pin (VIN+) to the input with a wire that does not touch the PCB surface.
b) Connect the guard ring to the inverting input pin (VIN–). This biases the guard ring to the same reference as the
comparator.
2. For Inverting Configuration:
a) Connect the guard ring to the non-inverting input pin (VIN+). This biases the guard ring to the same reference voltage as
the comparator (e.g., VDD/2 or ground).
b) Connect the inverting pin (VIN–) to the input with a wire that does not touch the PCB surface.
Figure 6. Example Guard Ring Layout for Inverting Comparator
Ground Sensing and Rail to Rail Output
The TP202x family implements a rail-to-rail topology that is capable of swinging to within 10mV of either rail. Since the
inputs can go 300mV beyond either rail, the comparator can easily perform ‘true ground’ sensing.
REV1.3
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14
TP2021/TP2025
SC70, 1.8V, Nano-power Comparators with Voltage Reference
The maximum output current is a function of total supply voltage. As the supply voltage of the comparator increases,
the output current capability also increases. Attention must be paid to keep the junction temperature of the IC below
150°C when the output is in continuous short-circuit condition. The output of the amplifier has reverse-biased ESD
diodes connected to each supply. The output should not be forced more than 0.5V beyond either supply, otherwise
current will flow through these diodes.
ESD
The TP202x family has reverse-biased ESD protection diodes on all inputs and output. Input and output pins can not
be biased more than 300mV beyond either supply rail.
Power Supply Layout and Bypass
The TP202x family’s power supply pin should have a local bypass capacitor (i.e., 0.01μF to 0.1μF) within 2mm for
good high frequency performance. It can also use a bulk capacitor (i.e., 1μF or larger) within 100mm to provide large,
slow currents. This bulk capacitor can be shared with other analog parts.
Good ground layout improves performance by decreasing the amount of stray capacitance and noise at the
comparator’s inputs and outputs. To decrease stray capacitance, minimize PCB lengths and resistor leads, and place
external components as close to the comparator’ pins as possible.
Proper Board Layout
The TP202x family is a series of fast-switching, high-speed comparator and requires high-speed layout considerations.
For best results, the following layout guidelines should be followed:
1. Use a printed circuit board (PCB) with a good, unbroken low-inductance ground plane.
2. Place a decoupling capacitor (0.1μF ceramic, surface-mount capacitor) as close as possible to supply.
3. On the inputs and the output, keep lead lengths as short as possible to avoid unwanted parasitic feedback
around the comparator. Keep inputs away from the output.
4. Solder the device directly to the PCB rather than using a socket.
5. For slow-moving input signals, take care to prevent parasitic feedback. A small capacitor (1000 pF or less)
placed between the inputs can help eliminate oscillations in the transition region. This capacitor causes some
degradation to propagation delay when the impedance is low. The topside ground plane should be placed
between the output and inputs.
6. The ground pin ground trace should run under the device up to the bypass capacitor, thus shielding the inputs
from the outputs.
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15
TP2021/TP2025
SC70, 1.8V, Nano-power Comparators with Voltage Reference
Typical Applications
IR Receiver
The TP202x is an ideal candidate to be used as an infrared receiver shown in Figure 7. The infrared photo diode
creates a current relative to the amount of infrared light present. The current creates a voltage across RD. When this
voltage level cross the voltage applied by the voltage divider to the inverting input, the output transitions. Optional Ro
provides additional hysteresis for noise immunity.
Figure 7. IR Receiver
Relaxation Oscillator
A relaxation oscillator using TP2021 is shown in Figure 8. Resistors R1 and R2 set the bias point at the comparator's
inverting input. The period of oscillator is set by the time constant of R4 and C1. The maximum frequency is limited by
the large signal propagation delay of the comparator. TP2021’s low propagation delay guarantees the high frequency
oscillation.
If the inverted input (VC1) is lower than the non-inverting input (VA), the output is high which charges C1 through R4 until
VC1 is equal to VA. The value of VA at this point is
V
R
2
DD
|| R R
2
V
A1
R
1
3
At this point the comparator switches pulling down the output to the negative rail. The value of VA at this point is
V
R || R
DD
2
3
V
A2
R
R || R
3
1
2
If R1=R2=R3, then VA1=2VDD /3, and VA2= VDD/3
The capacitor C1 now discharges through R4, and the voltage VC decreases till it is equal to VA2, at which point the
comparator switches again, bringing it back to the initial stage. The time period is equal to twice the time it takes to
discharge C1 from 2VDD/3 to VDD/3. Hence the frequency is:
1
Freq
2 ln2 R C
4
1
REV1.3
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16
TP2021/TP2025
SC70, 1.8V, Nano-power Comparators with Voltage Reference
VDD
R3
VO
R1
R2
TP2021
VA
t
t
VC1
Vo
VC1
2/3VDD
1/3VDD
R4
C1
R1=R2=R3
Figure 8. Relaxation Oscillator
Battery Level Detect
The low power consumption and 1.8V supply voltage of the TP202x make it an excellent candidate for
battery-powered applications. Figure 9 shows the TP202x configured as a low battery level detector for a 3V battery.
BatteryGood V (R R )/R
2
r
1
2
Figure 9. Battery Level Detect
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17
TP2021/TP2025
SC70, 1.8V, Nano-power Comparators with Voltage Reference
Package Outline Dimensions
SC-70-5 / SC-70-6 (SOT353 / SOT363)
Dimensions
Dimensions In
Inches
In Millimeters
Symbol
Min
Max
Min
Max
A1
A2
b
0.000
0.900
0.150
0.080
2.000
1.150
2.150
0.100
1.000
0.350
0.150
2.200
1.350
2.450
0.000
0.035
0.006
0.003
0.079
0.045
0.085
0.004
0.039
0.014
0.006
0.087
0.053
0.096
C
D
E
E1
e
0.650TYP
0.026TYP
e1
L1
θ
1.200
0.260
0°
1.400
0.460
8°
0.047
0.010
0°
0.055
0.018
8°
REV1.3
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18
TP2021/TP2025
SC70, 1.8V, Nano-power Comparators with Voltage Reference
Package Outline Dimensions
SOT23-5 / SOT23-6
Dimensions
Dimensions
In Inches
In Millimeters
Symbol
Min
Max
Min
Max
A1
A2
b
0.000
1.050
0.300
2.820
1.500
2.650
0.100
1.150
0.400
3.020
1.700
2.950
0.000
0.041
0.012
0.111
0.059
0.104
0.004
0.045
0.016
0.119
0.067
0.116
D
E
E1
e
0.950TYP
0.037TYP
e1
L1
θ
1.800
0.300
0°
2.000
0.460
8°
0.071
0.012
0°
0.079
0.024
8°
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19
TP2021/TP2025
SC70, 1.8V, Nano-power Comparators with Voltage Reference
Package Outline Dimensions
SO-8 (SOIC-8)
A2
C
θ
L1
A1
e
E
D
Dimensions
Dimensions In
Inches
In Millimeters
Symbol
Min
Max
Min
Max
A1
A2
b
0.100
1.350
0.330
0.190
4.780
3.800
5.800
0.250
1.550
0.510
0.250
5.000
4.000
6.300
0.004
0.053
0.013
0.007
0.188
0.150
0.228
0.010
0.061
0.020
0.010
0.197
0.157
0.248
E1
C
D
E
E1
e
1.270TYP
0.050TYP
L1
θ
0.400
0°
1.270
8°
0.016
0°
0.050
8°
b
REV1.3
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20
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