Order
Now
Product
Folder
Support &
Community
Tools &
Software
Technical
Documents
TPS3701
SBVS240C – NOVEMBER 2014 – REVISED FEBRUARY 2019
TPS3701 High voltage (36V) window voltage detector with internal reference
for over and undervoltage monitoring
1 Features
3 Description
•
•
•
The TPS3701 wide-supply voltage window detector
operates over a 1.8-V to 36-V range. The device has
two precision comparators with an internal 400-mV
reference and two open-drain outputs (OUTA and
OUTB) rated to 25 V for over- and undervoltage
detection. Use the TPS3701 as a window voltage
detector or as two independent voltage monitors; set
the monitored voltage with the use of external
resistors.
Wide supply voltage range: 1.8 V to 36 V
Adjustable threshold: down to 400 mV
Open-drain outputs for over- and undervoltage
detection
Low quiescent current: 7 µA (Typical)
High threshold accuracy:
– 0.75% Over temperature
– 0.25% (Typical)
Internal hysteresis: 5.5 mV (typical)
Temperature range: –40°C to 125°C
Package:
– SOT-6
1
•
•
•
•
•
2 Applications
•
•
•
•
•
•
Industrial control systems
Embedded computing modules
DSPs, microcontrollers, and microprocessors
Notebook and desktop computers
Portable- and battery-powered products
FPGA and ASIC systems
OUTA is driven low when the voltage at the INA pin
drops below the negative threshold, and goes high
when the voltage returns above the positive
threshold. OUTB is driven low when the voltage at
the INB pin rises above the positive threshold, and
goes high when the voltage drops below the negative
threshold. Both comparators in the TPS3701 include
built-in hysteresis for noise rejection, thereby
ensuring stable output operation without false
triggering.
The TPS3701 is available in a SOT-6 package and is
specified over the junction temperature range of
–40°C to 125°C.
Device Information(1)
PART NUMBER
PACKAGE
TPS3701
SOT (6)
BODY SIZE (NOM)
2.90 mm × 1.60 mm
(1) For all available packages, see the package option addendum
at the end of the data sheet.
Typical Application
VMON
Typical Error vs Junction Temperature
VPULLUP
0 V to 25 V
1.8 V to 36 V
0.04
0.1 mF
VDD
R1
RP1
OUTA
INA
RP2
R2
To a reset
or enable
input of
the system.
Device
Typical Threshold Error (%)
0.02
0
-0.02
-0.04
-0.06
-0.08
-0.1
-0.12
INA Negative Threshold
INB Positive Threshold
-0.14
OUTB
INB
R3
GND
-0.16
-40
-20
0
20
40
60
TJ
80
100
120
140
D012
1
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.
TPS3701
SBVS240C – NOVEMBER 2014 – REVISED FEBRUARY 2019
www.ti.com
Table of Contents
1
2
3
4
5
6
7
Features ..................................................................
Applications ...........................................................
Description .............................................................
Revision History.....................................................
Pin Configuration and Functions .........................
Specifications.........................................................
1
1
1
2
3
4
6.1
6.2
6.3
6.4
6.5
6.6
6.7
4
4
4
4
5
6
7
Absolute Maximum Ratings .....................................
ESD Ratings..............................................................
Recommended Operating Conditions.......................
Thermal Information ..................................................
Electrical Characteristics...........................................
Timing Requirements ................................................
Typical Characteristics ..............................................
Detailed Description ............................................ 10
7.1 Overview ................................................................. 10
7.2 Functional Block Diagram ....................................... 10
7.3 Feature Description................................................. 11
7.4 Device Functional Modes........................................ 11
8
Application and Implementation ........................ 12
8.1 Application Information............................................ 12
8.2 Typical Application ................................................. 16
9 Power Supply Recommendations...................... 18
10 Layout................................................................... 19
10.1 Layout Guidelines ................................................. 19
10.2 Layout Example .................................................... 19
11 Device and Documentation Support ................. 20
11.1
11.2
11.3
11.4
11.5
11.6
Documentation Support .......................................
Receiving Notification of Documentation Updates
Community Resources..........................................
Trademarks ...........................................................
Electrostatic Discharge Caution ............................
Glossary ................................................................
20
20
20
20
20
20
12 Mechanical, Packaging, and Orderable
Information ........................................................... 20
4 Revision History
Changes from Revision B (June 2018) to Revision C
Page
•
Changed the text "supervisor" to "voltage detector"............................................................................................................... 1
•
Changed "supervisor" to "voltage detector" ......................................................................................................................... 12
Changes from Revision A (November 2017) to Revision B
•
Page
Changed the text 'window comparator' to 'window supervisor' throughout the data sheet ................................................... 1
Changes from Original (November 2014) to Revision A
Page
•
Changed input pin voltage maximum from: 1.7 V to: 6.5 V.................................................................................................... 4
•
Added a tablenote for the input pin voltage maximum ........................................................................................................... 4
•
Changed Figure 19 .............................................................................................................................................................. 12
2
Submit Documentation Feedback
Copyright © 2014–2019, Texas Instruments Incorporated
Product Folder Links: TPS3701
TPS3701
www.ti.com
SBVS240C – NOVEMBER 2014 – REVISED FEBRUARY 2019
5 Pin Configuration and Functions
DDC Package
6-Pin SOT
(Top View)
OUTA
1
6
OUTB
GND
2
5
VDD
INA
3
4
INB
Pin Functions
PIN
I/O
DESCRIPTION
NAME
NO.
GND
2
—
INA
3
I
Comparator A input. This pin is connected to the voltage to be monitored with the use of an
external resistor divider. When the voltage at this terminal drops below the threshold voltage
VIT–(INA), OUTA is driven low.
INB
4
I
Comparator B input. This pin is connected to the voltage to be monitored with the use of an
external resistor divider. When the voltage at this terminal exceeds the threshold voltage
VIT+(INB), OUTB is driven low.
OUTA
1
O
INA comparator open-drain output. OUTA is driven low when the voltage at this comparator
is less than VIT–(INA). The output goes high when the sense voltage rises above VIT+(INA).
OUTB
6
O
INB comparator open-drain output. OUTB is driven low when the voltage at this comparator
exceeds VIT+(INB). The output goes high when the sense voltage falls below VIT–(INB).
VDD
5
I
Supply voltage input. Connect a 1.8-V to 36-V supply to VDD to power the device. It is good
analog design practice to place a 0.1-µF ceramic capacitor close to this pin.
Ground
Submit Documentation Feedback
Copyright © 2014–2019, Texas Instruments Incorporated
Product Folder Links: TPS3701
3
TPS3701
SBVS240C – NOVEMBER 2014 – REVISED FEBRUARY 2019
www.ti.com
6 Specifications
6.1 Absolute Maximum Ratings
Over operating junction temperature range, unless otherwise noted. (1)
Voltage (2)
Current
(2)
MAX
–0.3
+40
VOUTA, VOUTB
–0.3
+28
VINA, VINB
–0.3
+7
Output pin current
Temperature
(1)
MIN
VDD
UNIT
V
40
mA
Operating junction, TJ
–40
+125
Storage temperature, Tstg
–65
+150
°C
Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings
only, which do not imply functional operation of the device at these or any other conditions beyond those indicated under Recommended
Operating Conditions. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
All voltages are with respect to network ground terminal.
6.2 ESD Ratings
VALUE
V(ESD)
(1)
(2)
Electrostatic discharge
Human-body model (HBM), per ANSI/ESDA/JEDEC JS-001 (1)
±2000
Charged-device model (CDM), per JEDEC specification JESD22C101 (2)
±500
UNIT
V
JEDEC document JEP155 states that 500-V HBM allows safe manufacturing with a standard ESD control process.
JEDEC document JEP157 states that 250-V CDM allows safe manufacturing with a standard ESD control process.
6.3 Recommended Operating Conditions
over operating junction temperature range (unless otherwise noted)
MIN
VDD
Supply pin voltage
VINA, VINB
NOM
MAX
UNIT
1.8
36
V
Input pin voltage
0
6.5 (1)
V
VOUTA, VOUTB
Output pin voltage
0
25
V
IOUTA, IOUTB
Output pin current
0
10
mA
TJ
Junction temperature
+125
°C
(1)
–40
+25
Operating VINA or VINB at 2.4 V or higher and at 125°C continuously for 10 years or more would cause a degradation of accuracy spec
to 1.5% maximum
6.4 Thermal Information
TPS3701
THERMAL METRIC (1)
DDC (SOT)
UNIT
6 PINS
RθJA
Junction-to-ambient thermal resistance
201.6
°C/W
RθJC(top)
Junction-to-case (top) thermal resistance
47.8
°C/W
RθJB
Junction-to-board thermal resistance
51.2
°C/W
ψJT
Junction-to-top characterization parameter
0.7
°C/W
ψJB
Junction-to-board characterization parameter
50.8
°C/W
RθJC(bot)
Junction-to-case (bottom) thermal resistance
N/A
°C/W
(1)
4
For more information about traditional and new thermal metrics, see the Semiconductor and IC Package Thermal Metrics application
report (SPRA953).
Submit Documentation Feedback
Copyright © 2014–2019, Texas Instruments Incorporated
Product Folder Links: TPS3701
TPS3701
www.ti.com
SBVS240C – NOVEMBER 2014 – REVISED FEBRUARY 2019
6.5 Electrical Characteristics
Over the operating temperature range of TJ = –40°C to +125°C, 1.8 V ≤ VDD < 36 V, and pull-up resistors RP1,2 = 100 kΩ,
unless otherwise noted. Typical values are at TJ = 25°C and VDD = 12 V.
PARAMETER
VDD
TEST CONDITIONS
Supply voltage range
MIN
TYP
1.8
(1)
MAX
36
VOL ≤ 0.2 V
UNIT
V
V(POR)
Power-on reset voltage
0.8
V
VIT–(INA)
INA pin negative input threshold voltage VDD = 1.8 V to 36 V
397
400
403
mV
VIT+(INA)
INA pin positive input threshold voltage
400
405.5
413
mV
VHYS(INA)
INA pin hysteresis voltage
(HYS = VIT+(INA) – VIT–(INA))
2
5.5
12
mV
VIT–(INB)
INB pin negative input threshold voltage VDD = 1.8 V to 36 V
387
394.5
400
mV
VIT+(INB)
INB pin positive input threshold voltage
397
400
403
mV
VHYS(INB)
INB pin hysteresis voltage
(HYS = VIT+(INB) – VIT–(INB))
2
5.2
12
mV
VOL
Low-level output voltage
VDD = 1.8 V, IOUT = 3 mA
130
250
mV
VDD = 5 V, IOUT = 5 mA
150
250
mV
IIN
Input current (at INA, INB pins)
ID(leak)
Open-drain output leakage current
VDD = 1.8 V and 36 V, VOUT = 25 V
IDD
Supply current
VDD = 1.8 V – 36 V
UVLO
Undervoltage lockout (2)
VDD falling
(1)
(2)
VDD = 1.8 V to 36 V
VDD = 1.8 V to 36 V
VDD = 1.8 V and 36 V, VINA, VINB = 6.5 V
–25
+1
+25
nA
VDD = 1.8 V and 36 V, VINA, VINB = 0.1 V
–15
+1
+15
nA
10
300
nA
8
11
µA
1.5
1.7
V
1.3
The lowest supply voltage (VDD) at which output is active; tr(VDD) > 15 µs/V. If less than V(POR), the output is undetermined.
When VDD falls below UVLO, OUTA is driven low and OUTB goes to high impedance. The outputs cannot be determined if less than
V(POR).
Submit Documentation Feedback
Copyright © 2014–2019, Texas Instruments Incorporated
Product Folder Links: TPS3701
5
TPS3701
SBVS240C – NOVEMBER 2014 – REVISED FEBRUARY 2019
www.ti.com
6.6 Timing Requirements
PARAMETER
TEST CONDITION
MIN
TYP
MAX
UNIT
.tpd(HL)
High-to-low propagation delay
(1)
VDD = 24 V, ±10-mV input overdrive,
RL = 100 kΩ, VOH = 0.9 × VDD, VOL = 250 mV
9.9
µs
tpd(LH)
Low-to-high propagation delay (1)
VDD = 24 V, ±10-mV input overdrive,
RL = 100 kΩ, VOH = 0.9 × VDD, VOL = 250 mV
28.1
µs
Startup delay
VDD = 5 V
155
µs
tr
Output rise time
VDD = 12 V, 10-mV input overdrive,
RL = 100 kΩ, CL = 10 pF, VO = (0.1 to 0.9) × VDD
2.7
µs
tf
Output fall time
VDD = 12 V, 10-mV input overdrive,
RL = 100 kΩ, CL = 10 pF, VO = (0.9 to 0.1) × VDD
0.12
µs
td(start)
(1)
(2)
(2)
High-to-low and low-to-high refers to the transition at the input pins (INA and INB).
During power on, VDD must exceed 1.8 V for at least 150 µs (typical) before the output state reflects the input condition.
VDD
V(POR)
VIT+(INA)
INA
V HYS
VIT±(INA)
OUTA
t pd(LH)
t pd(HL)
t pd(LH)
VIT+(INB)
INB
V HYS
VIT±(INB)
OUTB
t pd(LH)
t pd(HL)
t d(start)
Figure 1. Timing Diagram
6
Submit Documentation Feedback
Copyright © 2014–2019, Texas Instruments Incorporated
Product Folder Links: TPS3701
TPS3701
www.ti.com
SBVS240C – NOVEMBER 2014 – REVISED FEBRUARY 2019
6.7 Typical Characteristics
At TJ = 25°C and VDD = 12 V, unless otherwise noted.
10
22
INA
INB
20
Minimum Pulse Width (Ps)
Supply Current (PA)
8
6
4
TJ = -40qC
TJ = 0qC
TJ = 25qC
TJ = 85qC
TJ = 125qC
2
18
16
14
12
10
8
6
4
2
0
0
0
6
12
18
24
Supply Voltage (V)
30
36
0
5
10
15
20
25
30
Overdrive (%)
D001
35
40
45
50
D011
VDD = 24 V
Figure 2. Supply Current vs Supply Voltage
Figure 3. Minimum Pulse Duration vs
Threshold Overdrive Voltage (1) (1)
400.2
408.5
408
400.05
407
VIT-(INA) (mV)
VIT-(INB) (mV)
407.5
VDD = 1.8 V
VDD = 12 V
VDD = 36 V
406.5
406
405.5
399.9
399.75
399.6
405
VDD = 1.8 V
VDD = 12 V
VDD = 36 V
399.45
404.5
404
-40
-20
0
20
40
60
TJ (qC)
80
100
120
399.3
-40
140
Figure 4. INA Positive Input Threshold Voltage (VIT+(INA)) vs
Temperature
80
100
120
140
D002
395.1
394.8
VIT-(INB) (mV)
VIT+(INB) (mV)
40
60
TJ (qC)
395.4
399.9
399.75
394.5
394.2
393.9
393.6
393.3
399.6
393
-20
0
20
40
60
TJ (qC)
80
100
120
140
392.7
-40
D004
Figure 6. INB Positive Input Threshold Voltage (VIT+(INB)) vs
Temperature
(1)
20
395.7
VDD = 1.8 V
VDD = 12 V
VDD = 36 V
400.05
399.45
-40
0
Figure 5. INA Negative Input Threshold Voltage (VIT–(INA)) vs
Temperature
400.35
400.2
-20
D005
VDD = 1.8 V
VDD = 12 V
VDD = 36 V
-20
0
20
40
60
TJ (qC)
80
100
120
140
D003
Figure 7. INB Negative Input Threshold Voltage (VIT–(INB)) vs
Temperature
Minimum pulse duration required to trigger output high-to-low transition. INA = negative spike below VIT– and INB = positive spike above
VIT+.
Submit Documentation Feedback
Copyright © 2014–2019, Texas Instruments Incorporated
Product Folder Links: TPS3701
7
TPS3701
SBVS240C – NOVEMBER 2014 – REVISED FEBRUARY 2019
www.ti.com
Typical Characteristics (continued)
At TJ = 25°C and VDD = 12 V, unless otherwise noted.
4500
3500
4000
3000
3500
3000
2000
Count
Count
2500
1500
2500
2000
1500
1000
1000
500
500
402
401
400
398
408
407
406
405
404
399
0
0
D020
D022
VIT-(INA) Threshold Voltage (mV)
VIT+(INA) Threshold Voltage (mV)
VDD = 1.8 V
VDD = 1.8 V
Figure 8. INA Positive Input Threshold Voltage (VIT+(INA))
Distribution
Figure 9. INA Negative Input Threshold Voltage (VIT–(INA))
Distribution
3000
3500
2500
3000
2500
Count
1500
1000
2000
1500
397
396
393
402
401
0
400
0
399
500
398
500
395
1000
394
Count
2000
D021
D023
VIT+(INB) Threshold Voltage (mV)
VIT-(INB) Threshold Voltage (mV)
VDD = 1.8 V
Figure 10. INB Positive Input Threshold Voltage (VIT+(INB))
Distribution
Figure 11. INB Negative Input Threshold Voltage (VIT–(INB))
Distribution
12
3.3
VDD = 1.8 V, INA to OUTA
VDD = 36 V, INA to OUTA
VDD = 1.8 V, INB to OUTB
VDD = 36 V, INB to OUTB
11
10
Low-to-High Propagation Delay (Ps)
High-to-Low Propagation Delay (Ps)
VDD = 1.8 V
9
8
7
6
5
-40
-20
0
20
40
60
TJ (qC)
80
100
120
140
VDD = 1.8 V, INA to OUTA
VDD = 36 V, INA to OUTA
VDD = 1.8 V, INB to OUTB
VDD = 36 V, INB to OUTB
3
2.7
2.4
2.1
1.8
1.5
1.2
-40
-20
D007
Input step ±200 mV
20
40
60
TJ (qC)
80
100
120
140
D008
Input step ±200 mV
Figure 12. Propagation Delay vs Temperature
(High-to-Low Transition at the Inputs)
8
0
Figure 13. Propagation Delay vs Temperature
(Low-to-High Transition at the Inputs)
Submit Documentation Feedback
Copyright © 2014–2019, Texas Instruments Incorporated
Product Folder Links: TPS3701
TPS3701
www.ti.com
SBVS240C – NOVEMBER 2014 – REVISED FEBRUARY 2019
Typical Characteristics (continued)
At TJ = 25°C and VDD = 12 V, unless otherwise noted.
0.5
0.6
TJ = -40qC
TJ = 0qC
TJ = 25qC
TJ = 85qC
TJ = 125qC
0.5
0.4
VOL (V)
VOL (V)
0.4
TJ = -40qC
TJ = 0qC
TJ = 25qC
TJ = 85qC
TJ = 125qC
0.3
0.3
0.2
0.2
0.1
0.1
0
0
0
1
2
3
4
5
6
IOUT (mA)
7
8
9
10
0
1
2
3
4
D009
VDD = 1.8 V
5
6
IOUT (mA)
7
8
9
10
D010
VDD = 12 V
Figure 14. Output Voltage Low vs Output Sink Current
Figure 15. Output Voltage Low vs Output Sink Current
210
Startup Delay (Ps)
195
Startup
Delay
Period
VDD (2 V/div)
180
OUTA (2 V/div)
165
150
OUTB (2 V/div)
135
120
-40
-20
0
20
40
60
TJ (qC)
80
100
120
140
Time (50 µs/div)
D025
VDD = 5 V, VINA = 390 mV, VINB = 410 mV, VPULL-UP = 3.3 V
VDD = 5 V
Figure 17. Start-Up Delay
Figure 16. Start-Up Delay vs Temperature
VDD (2 V/div)
Startup
Delay
Period
OUTA (2 V/div)
OUTB (2 V/div)
Time (50 µs/div)
VDD = 5 V, VINA = 410 mV, VINB = 390 mV, VPULL-UP = 3.3 V
Figure 18. Start-Up Delay
Submit Documentation Feedback
Copyright © 2014–2019, Texas Instruments Incorporated
Product Folder Links: TPS3701
9
TPS3701
SBVS240C – NOVEMBER 2014 – REVISED FEBRUARY 2019
www.ti.com
7 Detailed Description
7.1 Overview
The TPS3701 combines two comparators (referred to as A and B) and a precision reference for over- and
undervoltage detection. The TPS3701 features a wide supply voltage range (1.8 V to 36 V) and high-accuracy
window threshold voltages of 400 mV (0.75% over temperature) with built-in hysteresis. The outputs are rated to
25 V and can sink up to 10 mA.
Set each input pin (INA, INB) to monitor any voltage above 0.4 V by using an external resistor divider network.
Each input pin has very low input leakage current, allowing the use of large resistor dividers without sacrificing
system accuracy. To form a window voltage detector, use the two input pins and three resistors (see the Window
Voltage Detector Considerations section). In this configuration, the TPS3701 is designed to assert the output
signals when the monitored voltage is within the window band. Each input can also be used independently. The
relationship between the inputs and the outputs is shown in Table 1. Broad voltage thresholds are supported that
enable the device to be used in a wide array of applications.
Table 1. Truth Table
CONDITION
OUTPUT
INA > VIT+(INA)
OUTA high
Output A high impedance
STATUS
INA < VIT–(INA)
OUTA low
Output A asserted
INB > VIT+(INB)
OUTB low
Output B asserted
INB < VIT–(INB)
OUTB high
Output B high impedance
7.2 Functional Block Diagram
VDD
INA
OUTA
A
OUTB
B
INB
Reference
GND
10
Submit Documentation Feedback
Copyright © 2014–2019, Texas Instruments Incorporated
Product Folder Links: TPS3701
TPS3701
www.ti.com
SBVS240C – NOVEMBER 2014 – REVISED FEBRUARY 2019
7.3 Feature Description
7.3.1 Inputs (INA, INB)
The TPS3701 combines two comparators with a precision reference voltage. Each comparator has one external
input; the other input is connected to the internal reference. The rising threshold on INB and the falling threshold
on INA are designed and trimmed to be equal to the reference voltage (400 mV). This configuration optimizes the
device accuracy when used as a window voltage detector. Both comparators also have built-in hysteresis that
proves immunity to noise and ensures stable operation.
The INA and INB inputs swings from ground to 1.7 V (7.0 V absolute maximum), regardless of the device supply
voltage used. Although not required in most cases, it is good analog design practice to place a 1-nF to 10-nF
bypass capacitor at the comparator input for noisy applications in order to reduce sensitivity to transient voltage
changes on the monitored signal.
For comparator A, the corresponding output (OUTA) is driven to logic low when the input INA voltage drops
below VIT–(INA). When the voltage exceeds VIT+(INA), OUTA goes to a high-impedance state; see Figure 1.
For comparator B, the corresponding output (OUTB) is driven to logic low when the voltage at input INB exceeds
VIT+(INB). When the voltage drops below VIT–(INB) OUTB goes to a high-impedance state; see Figure 1. Together,
these two comparators form a window voltage detector function as described in the Window Voltage Detector
Considerations section.
7.3.2 Outputs (OUTA, OUTB)
In a typical TPS3701 application, the outputs are connected to a reset or enable input of the processor [such as
a digital signal processor (DSP), application-specific integrated circuit (ASIC), or other processor type] or the
outputs are connected to the enable input of a voltage regulator [such as a DC-DC converter or low-dropout
regulator (LDO)].
The TPS3701 provides two open-drain outputs (OUTA and OUTB); use pull-up resistors to hold these lines high
when the output goes to a high-impedance state. Connect pull-up resistors to the proper voltage rails to enable
the outputs to be connected to other devices at correct interface voltage levels. The TPS3701 outputs can be
pulled up to 25 V, independent of the device supply voltage. To ensure proper voltage levels, give some
consideration when choosing the pull-up resistor values. The pull-up resistor value is determined by VOL, output
capacitive loading, and output leakage current (ID(leak)). These values are specified in the Electrical
Characteristics table. Use wired-OR logic to merge OUTA and OUTB into one logic signal.
Table 1 and the Inputs (INA, INB) section describe how the outputs are asserted or high impedance. See
Figure 1 for a timing diagram that describes the relationship between threshold voltages and the respective
output.
7.4 Device Functional Modes
7.4.1 Normal Operation (VDD > UVLO)
When the voltage on VDD is greater than 1.8 V for at least 155 µs, the OUTA and OUTB signals correspond to
the voltage on INA and INB as listed in Table 1.
7.4.2 Undervoltage Lockout (V(POR) < VDD < UVLO)
When the voltage on VDD is less than the device UVLO voltage, and greater than the power-on-reset voltage,
V(POR), the OUTA and OUTB signals are asserted and high impedance, respectively, regardless of the voltage on
INA and INB.
7.4.3 Power-On-Reset (VDD < V(POR))
When the voltage on VDD is lower than the required voltage to internally pull the asserted output to GND
(V(POR)), both outputs are in a high-impedance state.
Submit Documentation Feedback
Copyright © 2014–2019, Texas Instruments Incorporated
Product Folder Links: TPS3701
11
TPS3701
SBVS240C – NOVEMBER 2014 – REVISED FEBRUARY 2019
www.ti.com
8 Application and Implementation
NOTE
Information in the following applications sections is not part of the TI component
specification, and TI does not warrant its accuracy or completeness. TI’s customers are
responsible for determining suitability of components for their purposes. Customers should
validate and test their design implementation to confirm system functionality.
8.1 Application Information
The TPS3701 is used as a precision dual-voltage detector in several different configurations. The monitored
voltage (VMON), VDD voltage, and output pull-up voltage can be independent voltages or connected in any
configuration. The following sections show the connection configurations and the voltage limitations for each
configuration.
8.1.1 Window Voltage Detector Considerations
The inverting and noninverting configuration of the comparators forms a window voltage detector circuit using a
resistor divider network, as shown in Figure 19 and Figure 20. The input pins can monitor any system voltage
above 400 mV with the use of a resistor divider network. INA and INB monitor for undervoltage and overvoltage
conditions, respectively.
VMON
1.8 V to 25 V
RP1
(50 kW)
VDD
OUTA
INA
R2
(13.7 kW)
OUT
R1
(2.21 MW)
Device
OUTB
INB
R3
(69.8 kW)
UV
OUT
VMON
OV
Reset or to MCU
GND
Figure 19. Window Voltage Detector Block Diagram
Overvoltage
Limit
VMON(OV)
VMON(OV_HYS)
VMON
Undervoltage
Limit
VMON(UV_HYS)
VMON(UV)
OUTB
OUTA
Figure 20. Window Voltage Detector Timing Diagram
12
Submit Documentation Feedback
Copyright © 2014–2019, Texas Instruments Incorporated
Product Folder Links: TPS3701
TPS3701
www.ti.com
SBVS240C – NOVEMBER 2014 – REVISED FEBRUARY 2019
Application Information (continued)
The TPS3701 flags the overvoltage or undervoltage condition with the greatest accuracy. The highest accuracy
threshold voltages are VIT–(INA) and VIT+(INB), and correspond with the falling undervoltage flag, and the rising
overvoltage flag, respectively. These thresholds represent the accuracy when the monitored voltage is within the
valid window (both OUTA and OUTB are in a high-impedance state), and correspond to the VMON(UV) and
VMON(OV) trigger voltages, respectively. If the monitored voltage is outside of the valid window (VMON is less than
the undervoltage limit, VMON(UV), or greater than overvoltage limit, VMON(OV)), then the input threshold voltages to
re-enter the valid window are VIT+(INA) or VIT–(INB), and correspond with the VMON(UV_HYS) and VMON(OV_HYS)
monitored voltages, respectively.
The resistor divider values and target threshold voltage can be calculated by using Equation 1 through
Equation 4:
RTOTAL = R1 + R2 + R3
(1)
Choose an RTOTAL value so that the current through the divider is approximately 100 times higher than the input
current at the INA and INB pins. Resistors with high values minimize current consumption; however, the input
bias current degrades accuracy if the current through the resistors is too low. See application report SLVA450,
Optimizing Resistor Dividers at a Comparator Input (SLVA450), for details on sizing input resistors.
R3 is determined by Equation 2:
RTOTAL
R3 =
VIT+(INB)
VMON(OV)
where
•
VMON(OV) is the target voltage at which an overvoltage condition is detected.
(2)
R2 is determined by either Equation 3 or Equation 4:
R2 =
RTOTAL
VMON(UV_HYS)
VIT+(INA) - R3
where
•
R2 =
VMON(UV_HYS) is the target voltage at which an undervoltage condition is removed as VMON rises.
(3)
RTOTAL
VIT-(INA) - R3
VMON(UV)
where
•
VMON(UV) is the target voltage at which an undervoltage condition is detected.
(4)
8.1.2 Input and Output Configurations
Figure 21 to Figure 24 show examples of the various input and output configurations.
Submit Documentation Feedback
Copyright © 2014–2019, Texas Instruments Incorporated
Product Folder Links: TPS3701
13
TPS3701
SBVS240C – NOVEMBER 2014 – REVISED FEBRUARY 2019
www.ti.com
Application Information (continued)
VPULLUP
(up to 25 V)
1.8 V to 36 V
VDD
OUTA
INA
To a reset or enable input
of the system.
Device
OUTB
INB
GND
Figure 21. Interfacing to Voltages Other than VDD
1.8 V to 25 V
VDD
OUTA
INA
To a reset or enable input
of the system.
Device
OUTB
INB
GND
Figure 22. Monitoring the Same Voltage as VDD
14
Submit Documentation Feedback
Copyright © 2014–2019, Texas Instruments Incorporated
Product Folder Links: TPS3701
TPS3701
www.ti.com
SBVS240C – NOVEMBER 2014 – REVISED FEBRUARY 2019
Application Information (continued)
VMON
1.8 V to 25 V
VDD
R1
OUTA
INA
R2
Device
OUTB
INB
R3
To a reset or enable input
of the system.
GND
NOTE: The inputs can monitor a voltage higher than VDD (max) with the use of an external resistor divider network.
Figure 23. Monitoring a Voltage Other than VDD
1.8 V to 18 V
5V
OUTA
VDD
INA
To a reset or enable
input of the system.
12 V
VIT±(INA)
VIT+(INA)
VIT±(INB)
VIT+(INB)
OUTB
Device
INB
GND
NOTE: In this case, OUTA is driven low when an undervoltage condition is detected at the 5-V rail and OUTB is driven low when an
overvoltage condition is detected at the 12-V rail.
Figure 24. Monitoring Overvoltage for One Rail and Undervoltage for a Different Rail
8.1.3 Immunity to Input Pin Voltage Transients
The TPS3701 is immune to short voltage transient spikes on the input pins. Sensitivity to transients depends on
both transient duration and amplitude; see Figure 3, Minimum Pulse Duration vs Threshold Overdrive Voltage.
Submit Documentation Feedback
Copyright © 2014–2019, Texas Instruments Incorporated
Product Folder Links: TPS3701
15
TPS3701
SBVS240C – NOVEMBER 2014 – REVISED FEBRUARY 2019
www.ti.com
8.2 Typical Application
VMON
24 V
0.01 F
+
VPULLUP
3.3 V
±
2.0 MŸ
VDD
100 kŸ
INA
OUTA
Device
6.81 kŸ
INB
100 kŸ
OUTB
GND
30.9 kŸ
Figure 25. 24-V, 10% Window Voltage Detector
8.2.1 Design Requirements
Table 2 lists the design parameters for this example.
Table 2. Design Parameters
PARAMETER
DESIGN REQUIREMENT
DESIGN RESULT
Monitored voltage
24-V nominal, rising (VMON(OV)) and
falling (VMON(UV)) threshold
±10% nominal (26.4 V and 21.6 V,
respectively)
VMON(OV) = 26.4 V ±2.7%, VMON(UV) = 21.6 V ±2.7%
Output logic voltage
3.3-V CMOS
3.3-V CMOS
Maximum current consumption
30 µA
24 µA
8.2.2 Detailed Design Procedure
1. Determine the minimum total resistance of the resistor network necessary to achieve the current
consumption specification by using Equation 1. For this example, the current flow through the resistor
network was chosen to be 13 µA; a lower current can be selected. However, take care to avoid leakage
currents that are artifacts of the manufacturing process. Leakage currents significantly impact the accuracy if
they are greater than 1% of the resistor network current.
VMON(OV ) 26.4 V
RTOTAL
2.03 M
I
13 PA
where
•
•
VMON(OV) is the target voltage at which an overvoltage condition is detected as VMON rises.
I is the current flowing through the resistor network.
(5)
2. After RTOTAL is determined, R3 can be calculated using Equation 6. Select the nearest 1% resistor value for
R3. In this case, 30.9 kΩ is the closest value.
RTOTAL
2.03 MW
R3 =
VIT+(INB) =
0.4 V = 30.7 kW
26.4 V
VMON(OV)
(6)
3. Use Equation 7 to calculate R2. Select the nearest 1% resistor value for R2. In this case, 6.81 kΩ is the
closest value.
RTOTAL
2.03 M:
R2
N
x VIT (INA ) R3
x 0.4 V 30.9 k
VMON(UV )
21.6 V
(7)
4. Use Equation 8 to calculate R1. Select the nearest 1% resistor value for R1. In this case, 2 MΩ is the closest
value.
16
Submit Documentation Feedback
Copyright © 2014–2019, Texas Instruments Incorporated
Product Folder Links: TPS3701
TPS3701
www.ti.com
SBVS240C – NOVEMBER 2014 – REVISED FEBRUARY 2019
R1 RTOTAL R2 R3
2.03 M
N
N
0
(8)
5. The worst-case tolerance can be calculated by referring to Equation 13 in application report Optimizing
Resistor Dividers at a Comparator Input (SLVA450). An example of the rising threshold error, VMON(OV), is
given in Equation 9:
$&&
72/ 9IT
(INB)
§
‡¨
¨
©
VIT
(INB)
VMON(OV )
·
¸‡
¸
¹
72/R
§
‡¨
©
0.4 ·
‡
26.4 ¸¹
where
•
•
•
% TOL(VIT+(INB)) is the tolerance of the INB positive threshold.
% ACC is the total tolerance of the VMON(OV) voltage.
% TOLR is the tolerance of the resistors selected.
(9)
6. When the outputs switch to the high-Z state, the rise time of the OUTA or OUTB node depends on the pullup resistance and the capacitance on the node. Choose pull-up resistors that satisfy the downstream timing
requirements; 100-kΩ resistors are a good choice for low-capacitive loads.
8.2.3 Application Curve
VDD (10 V/div)
OUTA (2 V/div)
OUTB (2 V/div)
Time (5 ms/div)
Figure 26. 24-V Window Monitor Output Response
Submit Documentation Feedback
Copyright © 2014–2019, Texas Instruments Incorporated
Product Folder Links: TPS3701
17
TPS3701
SBVS240C – NOVEMBER 2014 – REVISED FEBRUARY 2019
www.ti.com
9 Power Supply Recommendations
The TPS3701 has a 40-V absolute maximum rating on the VDD pin, with a recommended operating condition of
36 V. If the voltage supply that is providing power to VDD is susceptible to any large voltage transient that may
exceed 40 V, or if the supply exhibits high voltage slew rates greater than 1 V/µs, take additional precautions.
Place an RC filter between the supply and VDD to filter any high-frequency transient surges on the VDD pin. A
100-Ω resistor and 0.01-µF capacitor is required in these cases, as shown in Figure 27.
100 Ÿ
0.01 F
+
±
VPULLUP
R1
VDD
INA
OUTA
INB
OUTB
R2
R3
GND
Figure 27. Using an RC Filter to Remove High-Frequency Disturbances on VDD
18
Submit Documentation Feedback
Copyright © 2014–2019, Texas Instruments Incorporated
Product Folder Links: TPS3701
TPS3701
www.ti.com
SBVS240C – NOVEMBER 2014 – REVISED FEBRUARY 2019
10 Layout
10.1 Layout Guidelines
•
•
•
Place R1, R2, and R3 close to the device to minimize noise coupling into the INA and INB nodes.
Place the VDD decoupling capacitor close to the device.
Avoid using long traces for the VDD supply node. The VDD capacitor (CVDD), along with parasitic inductance
from the supply to the capacitor, may form an LC tank and create ringing with peak voltages above the
maximum VDD voltage. If this is unavoidable, see Figure 27 for an example of filtering VDD.
10.2 Layout Example
Pullup
Voltage
RP1
RP2
Overvoltage
Flag
Undervoltage
Flag
R1
Monitored
Voltage
1
6
2
5
3
4
R2
CVDD
Input
Supply
R3
Figure 28. Recommended Layout
Submit Documentation Feedback
Copyright © 2014–2019, Texas Instruments Incorporated
Product Folder Links: TPS3701
19
TPS3701
SBVS240C – NOVEMBER 2014 – REVISED FEBRUARY 2019
www.ti.com
11 Device and Documentation Support
11.1 Documentation Support
11.1.1 Related Documentation
For related documentation see the following application reports and user guide (available through the TI
website):
• Application report Using the TPS3700 as a negative rail over- and undervoltage detector (SLVA600).
• Application report Optimizing resistor dividers at a comparator input (SLVA450).
• User guide TPS3700EVM-114 Evaluation module (SLVU683).
11.2 Receiving Notification of Documentation Updates
To receive notification of documentation updates, navigate to the device product folder on ti.com. In the upper
right corner, click on Alert me to register and receive a weekly digest of any product information that has
changed. For change details, review the revision history included in any revised document.
11.3 Community Resources
The following links connect to TI community resources. Linked contents are provided "AS IS" by the respective
contributors. They do not constitute TI specifications and do not necessarily reflect TI's views; see TI's Terms of
Use.
TI E2E™ Online Community TI's Engineer-to-Engineer (E2E) Community. Created to foster collaboration
among engineers. At e2e.ti.com, you can ask questions, share knowledge, explore ideas and help
solve problems with fellow engineers.
Design Support TI's Design Support Quickly find helpful E2E forums along with design support tools and
contact information for technical support.
11.4 Trademarks
E2E is a trademark of Texas Instruments.
All other trademarks are the property of their respective owners.
11.5 Electrostatic Discharge Caution
This integrated circuit can be damaged by ESD. Texas Instruments recommends that all integrated circuits be handled with
appropriate precautions. Failure to observe proper handling and installation procedures can cause damage.
ESD damage can range from subtle performance degradation to complete device failure. Precision integrated circuits may be more
susceptible to damage because very small parametric changes could cause the device not to meet its published specifications.
11.6 Glossary
SLYZ022 — TI Glossary.
This glossary lists and explains terms, acronyms, and definitions.
12 Mechanical, Packaging, and Orderable Information
The following pages include mechanical, packaging, and orderable information. This information is the most
current data available for the designated devices. This data is subject to change without notice and revision of
this document. For browser-based versions of this data sheet, refer to the left-hand navigation.
20
Submit Documentation Feedback
Copyright © 2014–2019, Texas Instruments Incorporated
Product Folder Links: TPS3701
PACKAGE OPTION ADDENDUM
www.ti.com
10-Dec-2020
PACKAGING INFORMATION
Orderable Device
Status
(1)
Package Type Package Pins Package
Drawing
Qty
Eco Plan
(2)
Lead finish/
Ball material
MSL Peak Temp
Op Temp (°C)
Device Marking
(3)
(4/5)
(6)
TPS3701DDCR
ACTIVE
SOT-23-THIN
DDC
6
3000
RoHS & Green
NIPDAU
Level-2-260C-1 YEAR
TPS3701DDCT
ACTIVE
SOT-23-THIN
DDC
6
250
RoHS & Green
NIPDAU
Level-2-260C-1 YEAR
-40 to 125
ZABO
ZABO
(1)
The marketing status values are defined as follows:
ACTIVE: Product device recommended for new designs.
LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect.
NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in a new design.
PREVIEW: Device has been announced but is not in production. Samples may or may not be available.
OBSOLETE: TI has discontinued the production of the device.
(2)
RoHS: TI defines "RoHS" to mean semiconductor products that are compliant with the current EU RoHS requirements for all 10 RoHS substances, including the requirement that RoHS substance
do not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered at high temperatures, "RoHS" products are suitable for use in specified lead-free processes. TI may
reference these types of products as "Pb-Free".
RoHS Exempt: TI defines "RoHS Exempt" to mean products that contain lead but are compliant with EU RoHS pursuant to a specific EU RoHS exemption.
Green: TI defines "Green" to mean the content of Chlorine (Cl) and Bromine (Br) based flame retardants meet JS709B low halogen requirements of
工商网监
湘ICP备2023018690号
