TP2025U2_技术文档

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

V_Battery

DEVICE

DESCRIPTION

Fast 68ns, 1.8V Low Power (46µA), Internal Hysteresis,

±3mV Maximum V_OS, – 0.2V to V_DD+ 0.2V RRI, Push-

Pull (CMOS/TTL) Output Comparators

(1)

TP1941/TP1941N

/TP1942/TP1944

Load

R_PU

TP2021

Fast 68ns, 1.8V Low Power (46µA), Internal Hysteresis,

±3mV Maximum V_OS, – 0.2V to V_DD+ 0.2V RRI, Open-

Drain Output Comparators

TP1945/TP1945N

/TP1946/TP1948

Battery

Ref

R₁

R₂

TP1931

/TP1932/TP1934

950ns, 3µA, 1.8V, ±2.5mV V_OS-MAX, – 0.2V to V_DD+ 0.2V

RRI, Internal Hysteresis, Push-Pull Output Comparators

R_sense

TP1935

/TP1936/TP1938

950ns, 3µA, 1.8V, ±2.5mV V_OS-MAX, – 0.2V to V_DD+ 0.2V

RRI, Internal Hysteresis, Open-Drain Comparators

Ultra-low 200nA, 13µs, 1.6V, ±2mV Maximum V_OS

Internal Hysteresis, – 0.2V to V_DD+ 0.2V RRI, Push-Pull

(CMOS/TTL) Output Comparators

,

TP2011

/TP2012/TP2014

NOTE: (1) Use R_PUwith the TP2025

Ultra-low 200nA, 13µs, 1.6V, ±2mV Maximum V_OS

Internal Hysteresis, – 0.2V to V_DD+ 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

8-Pin SOIC

5-Pin SOT23

8-Pin SOIC

6-Pin SOT23

Tape and Reel, 3000

Tape and Reel, 4000

Tape and Reel, 3000

Tape and Reel, 4000

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

ANSI/ESDA/JEDEC JS-001

ANSI/ESDA/JEDEC JS-002

2

1

CDM

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3

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 T_A= 27°C.

V_DD= +1.8V to +5.5V, V_IN+= V_DD, V_IN-= 1.2V, R_PU=10kΩ, C_L=15pF.

SYMBOL PARAMETER

CONDITIONS

MIN

1.8

TYP

MAX

5.5

UNITS

V

V_DD

V_OS

Supply Voltage

●

Input Offset Voltage ^{Note 1}

V_CM= 1.2V

-2.0

0.5

+2.0

mV

V_OSTC

V_HYST

V_HYSTTC

I_B

Input Offset Voltage Drift ^{Note 1}

Input Hysteresis Voltage ^{Note 1}

Input Hysteresis Voltage Drift ^{Note 1}

Input Bias Current

V_CM= 1.2V

0.3

μV/°C

mV

μV/°C

pA

3

4

20

6

7

I_OS

Input Offset Current

4

pA

R_IN

Input Resistance

> 100

2

4

GΩ

Differential

Common Mode

V_CM= V_SSto V_DD

C_IN

Input Capacitance

pF

dB

V

CMRR

V_CM

Common Mode Rejection Ratio

Common-mode Input Voltage

Range

50

V^–

82

●

V⁺

PSRR

V_OH

V_OL

I_SC

Power Supply Rejection Ratio

High-Level Output Voltage

Low-Level Output Voltage

Output Short-Circuit Current

Quiescent Current per Comparator

60

V_DD-0.3

90

dB

V

mA

nA

V

I_OUT=-1mA

I_OUT=1mA

Sink or source current

●

V_SS+0.3

25

390

1.248

1.224

150

1.45

0.13

5

I_Q

●

440

1.272

1.246

V_DD= 5V

1.225

1.202

V_OUT

Reference Voltage

V_DD= 3V

V

V_OUTTC

V_OUTLC

Reference Voltage Drift

μV/°C

μV/μA

ns

0μA≤I_source≤400μA

0μA≤I_sink≤400μA

Reference

Regulation

Voltage

Load

t_R

t_F

Rising Time ^{Note 2}

Falling Time

5

ns

t_PD+

t_PD-

T_PD-SKEW

Propagation Delay (Low-to-High)

Propagation Delay (High-to-Low)

Propagation Delay Skew ^{Note 3}

Overdrive=100mV, V_IN-=1.2V

13

14

1

19

18

5

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, t_Rdependent on R_PUand C_L-.

Note 3: Propagation Delay Skew is defined as: t_PD-SKEW= t_PD+- t_PD-

.

REV1.3

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4

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

V_CM=1.2V

-25

V_CM=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

t_pd-@V_DD=5V

t_pd+@V_DD=5V

800

600

400

200

0

5V

t_pd-@V_DD=1.8V

t_pd+@V_DD=1.8V

1.8V

V_CM=1.2V

-50 -25

V_CM=1.2V

-50

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

0

-4

1.8V

V_CM=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

V_DD=5V

_CM=2.5V

15

V

_CM=2.5V

V

80

60

40

20

0

10

5

0

-5

t_pd-

-10

-15

-20

t_pd+

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

V_DD=1.8V

_CM=0.9V

15

V

_CM=0.9V

V

80

60

40

20

0

10

5

0

-5

-10

-15

-20

t_pd-

t_pd+

10

100

Common Mode Voltage (mV)

1V

10

100

Common Mode Voltage (mV)

1V

Input Offset Voltage vs. Common Mode Voltage

5

2.5

0

2.5

0

-2.5

V_DD=5V

-5

V_DD=1.8V

-5

0

1

2

3

4

5

0

0.5

1

1.5

2

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

10

8

10

8

6

4

2

V_DD=5V

0

V_DD=1.8V

0

1

2

3

4

5

0

0.5

1

1.5

2

Common Mode Voltage (V)

Quiescent Current vs. Common Mode Voltage

1000

800

600

400

200

1000

800

600

400

200

V_DD=5V

0

V_DD=1.8V

0

1

2

3

4

0

0.5

1

1.5

2

Common Mode Voltage (V)

Propagation Delay vs. Common Mode Voltage

20

t_pd+

15

t_pd+

t_pd-

10

t_pd-

5

V_DD=5V

0

V_DD=1.8V

0

1

2

3

4

0

0.5

1

1.5

2

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

5

2.5

0

2.5

0

-2.5

V_DD=5V

-5

V_DD=1.8V

-5

0

1

2

3

4

5

0

0.5

1

1.5

2

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

_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

60%

50%

40%

30%

20%

10%

0%

V

_DD=5V

V

_DD=5V

_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

_DD=5V

V

_DD=5V

35%

30%

25%

20%

15%

10%

5%

_CM=1.2V

100mV overdrive

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

I_sinking

I_sourcing

R_REFLOAD=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

1.3

1.24

1.28

1.235

I_sinking

1.26

1.23

1.24

1.22

I_sourcing

1.225

V_DD=5V

I_sourcing

V_DD=1.8V

1.22

1.2

0

100

200

300

400

0

10

20

30

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

5

2

V_DD=5V

V_DD=1.8V

4

1.5

Sourcing Current

3

Sourcing Current

1

2

Sinking Current

1

0.5

Sinking Current

0

5

10

15

0.0

0.5

1.0

1.5

2.0

Output Load Current (mA)

Output Voltage Headroom vs. Supply Voltage

Output Short Current vs. Supply Voltage

400

30

25

300

20

I_sinking

V_OH

15

10

200

100

I_sourcing

5

0

V_OL

I_OUT=±1mA

0

1

2

3

4

5

1

2

3

4

5

Supply Voltage (V)

REV1.3

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10

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

V_DD=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.

V_i

V_tr

V_i

V_tr

V_hyst=V_tr-V_tf

V_tr+V

V_hyst=V_tr-V_tf

V_tr+V

Hysteresis

Band

Hysteresis

Band

V_in-

^tf-V_in-

V_os=

2

V_os=

2

V_tf

Time

V_DD

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 (V_r) at the inverting input.

V_DD

R₂

(1)

R_PU

(1)

TP202x

R_PU

V_o

R₁

(1)

TP202x

R_PU

R₁

V_i

TP202x

R₁

V_o

V_tr

V_r

V₊=V_r

V_tf

Ref

V₊=V_r

V_o

Ref

NOTE: (1) Use RPU with the TP2025/5U

Figure 4. Non-Inverting Configuration with Hysteresis

Consider the comparator of TP2021/TP2021U, when V_iis low, the output is also low. For the output to switch from low

to high, V_imust rise up to V_tr. When V_iis high, the output is also high. In order for the comparator to switch back to a

low state, V_imust equal V_tfbefore the non-inverting input V+ is again equal to V_r.

R

2

V



V

tr

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

2

1

V



V

r

tr

R

2



R

1

2

V

V 

V

DD

r

tf

R

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 V_tfis slight difference with TP2021/TP2021U, so does the hysteresis voltage V_hyst

.

R

1

V

 (V

DD

 V

tf

)

 V

r

tf



R

1

2

PU



R

1

2

PU

V



V



V

r

DD

tf



R

2

PU

2

PU

R

1

V



V

if R_PU<<R₂

DD

hyst



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 (V_DD), as shown in Figure 5.

Figure 5. Inverting Configuration with Hysteresis

Consider the comparator of TP2021/TP2021U, when V_iis greater than V₊, the output voltage is low. In this case, the

three network resistors can be presented as paralleled resistor R₂|| R₃in series with R₁. When V_iat the inverting input

is less than V₊, the output voltage is high. The three network resistors can be represented as R₁||R₃in series with R₂.

R

1

V



(V  V )  V

DD

ref ref

tr



R

1

2

R

2

V



V

tf

ref



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

2

1

As for the TP2025/TP2025U, a pull-up resistor should be placed between output and the supply. The formula for

calculating V_tris slight difference with TP2021/TP2021U, so does the hysteresis voltage V_hyst

.

R

1

V



(V

DD

 V )  V

ref ref

tr

 R



R

PU

1

2

R

1

if R_PU<<R₂

V



V

DD

hyst



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 (V_IN+) to the input with a wire that does not touch the PCB surface.

b) Connect the guard ring to the inverting input pin (V_IN–). 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 (V_IN+). This biases the guard ring to the same reference voltage as

the comparator (e.g., V_DD/2 or ground).

b) Connect the inverting pin (V_IN–) 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 R_D. When this

voltage level cross the voltage applied by the voltage divider to the inverting input, the output transitions. Optional R_o

provides additional hysteresis for noise immunity.

Figure 7. IR Receiver

Relaxation Oscillator

A relaxation oscillator using TP2021 is shown in Figure 8. Resistors R₁and R₂set the bias point at the comparator's

inverting input. The period of oscillator is set by the time constant of R₄and 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 (V_C1) is lower than the non-inverting input (V_A), the output is high which charges C₁through R₄until

V_C1is equal to V_A. The value of V_Aat 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 V_Aat this point is

V

 R || R

DD

2

3

V



A2

R

 R || R

3

1

2

If R₁=R₂=R₃, then V_A1=2V_DD/3, and V_A2= V_DD/3

The capacitor C₁now discharges through R₄, and the voltage V_Cdecreases till it is equal to V_A2, 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 C₁from 2V_DD/3 to V_DD/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

V_DD

R₃

V_O

R₁

R₂

TP2021

V_A

t

V_C1

V_o

V_C1

2/3V_DD

1/3V_DD

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

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


型号：	TP2025U2
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

TP2025U2 [3PEAK]

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