TPS383x 150-nA, Ultralow Power, Supply Voltage Monitor
1Features3Description
1
•Ultralow Supply Current: 150 nA (Typical)
•Operating Supply Voltage: 0.9 V to 6.5 V
•Valid Reset for VDD> 0.6 V
•Push-Pull RESET Output
•Factory-Trimmed Reset Threshold Voltages
•Temperature Range: –40°C to 85°C
•Packages: 1-mm × 1-mm X2SON or 3-Pin SOT23
2Applications
•Portable and Battery-Powered Equipment
•Metering
•Industrial Equipment
•Cell Phonesspecified to have the correct output logic state for
•Glucose Monitors
•Tablets
•Wearables
The TPS3831 and TPS3839 devices (both referred to
as TPS383x) are ultralow current (150 nA, typical),
voltage supervisory circuits that monitor a single
voltage. Both devices initiate an active-low reset
signal whenever the VDDsupply voltage drops below
the factory-trimmed reset threshold voltage. The reset
output remains low for 200 ms (typical) after the V
DD
voltage rises above the threshold voltage and
hysteresis. These devices are designed to ignore fast
transients on the VDD pin. The TPS3831 device
includes a manual reset input that forces RESET low
when MR is low.
The ultralow current consumption of 150 nA makes
these voltage supervisors ideal for use in low-power
and portable applications. The TPS383x devices are
supply voltages down to 0.6 V.
The TPS383x devices feature precision factory-
trimmed threshold voltages and extremely low-power
operation. The TPS3831 device is available in a 4pin, 1-mm × 1-mm (DQN) X2SON package. The
TPS3839 device is available in a 3-pin SOT23 (DBZ)
package or a 4-pin, 1-mm × 1-mm (DQN) X2SON
package.
Device Information
PART NUMBERPACKAGE
TPS3831X2SON (4)1.00 mm x 1.00 mm
TPS3839
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
SOT-23 (3)2.92 mm x 2.37 mm
X2SON (4)1.00 mm x 1.00 mm
(1)
PACKAGE SIZE
Typical Application CircuitSupply Current vs Temperature
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.
NOTE: Page numbers for previous revisions may differ from page numbers in the current version.
Changes from Revision C (February 2015) to Revision DPage
•Changed µA to nA in document title....................................................................................................................................... 1
•Added TPS3839G25 to document ......................................................................................................................................... 1
•Changed Applications section: moved Metering bullet to second in list, changed Tablets bullet, added Wearables bullet .. 1
•Changed first paragraph of Description section .................................................................................................................... 1
•Changed Device Information table: changed Package Size column heading and value of SOT-23 row ............................. 1
•Added TPS3839G25 row to Device Options table ................................................................................................................ 4
•Changed Thermal Information table ...................................................................................................................................... 6
•Changed V
IT–
and V
parameters in Electrical Characteristics table: changed test conditions, added TPS3839G25 rows 7
hys
Changes from Revision B (April 2013) to Revision CPage
•Added ESD Ratings table, Feature Description section, Device Functional Modes, Application and Implementation
section, Power Supply Recommendations section, Layout section, Device and Documentation Support section, and
Mechanical, Packaging, and Orderable Information section ................................................................................................. 1
•Changed title of data sheet ................................................................................................................................................... 1
•Changed Operating Supply Voltage bullet from 0.6 V to 0.9 V.............................................................................................. 1
•Changed last sentence of Description section ...................................................................................................................... 1
•Changed front page figure ..................................................................................................................................................... 1
•Added MR parameter to Absolute Maximum Ratings ........................................................................................................... 6
•Changed condition statement for Electrical Characteristics .................................................................................................. 7
Changes from Revision A (September 2012) to Revision BPage
•Changed VDDtest conditions for high-level output voltage parameter................................................................................... 7
Changes from Original (June 2012) to Revision APage
•Changed data sheet status from product preview to production data.................................................................................... 1
MRN/AN/A2IAfter the MR pin is deasserted, the RESET output deasserts after the
NCN/A2N/A—No internal connection.
RESET211O
Thermal padN/AAvailableAvailable—
VDD344ISupply voltage
I/ODESCRIPTION
Manual reset. Pull this pin to a logic low to assert the RESET output.
reset delay (td) elapses.
Active-low reset output. RESET has a push-pull output drive and is
capable of directly driving input pins. RESET is low as long as V
remains below the factory threshold voltage, and until the delay time
(td) elapses after VDDrises above the threshold voltage.
Connect to ground or to a floating copper plane for mechanical
stability.
over operating free-air temperature range, unless otherwise noted
Voltage
CurrentRESET pin–1010mA
Temperature
(2)
(1) Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings
only, and functional operation of the device at these or any other conditions beyond those indicated under Recommended OperatingConditions is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
(2) As a result of the low dissipated power in this device, the junction temperature is assumed to be equal to the ambient temperature.
VDD, RESET–0.37V
MR–0.3VDD+ 0.3V
Operating ambient, T
Storage, T
stg
A
7.2 ESD Ratings
V
(ESD)
Electrostatic dischargeV
(1) JEDEC document JEP155 states that 500-V HBM allows safe manufacturing with a standard ESD control process.
(2) JEDEC document JEP157 states that 250-V CDM allows safe manufacturing with a standard ESD control process.
Human body model (HBM), per ANSI/ESDA/JEDEC JS-001
Charged device model (CDM), per JEDEC specification JESD22-C101
(1)
MINMAXUNIT
–4085
–65150
°C
VALUEUNIT
(1)
(2)
±2000
±500
7.3 Recommended Operating Conditions
over operating free-air temperature range (unless otherwise noted)
The TPS3831 and TPS3839 are ultralow current voltage supervisory circuits that monitor the input supply voltage
of these devices. Both devices assert an active-low reset whenever the VDDsupply voltage drops below the
negative-goingthresholdvoltage(V
200 ms after the VDDvoltage rises above the positive-going threshold voltage (V
designed to ignore fast transients on the VDD pin.
The TPS3831 device includes a manual reset input (MR) that can be used to force the RESET signal low, even if
the supply voltage is above V
IT–
.
8.2 Functional Block Diagram
).Theoutput,RESET,remainsassertedforapproximately
IT–
IT–
+ V
). These devices are
hys
8.3 Feature Description
8.3.1 VDD Transient Rejection
The TPS383x (TPS3831 and TPS3839) devices have built-in rejection of fast transients on the VDD pin.
Transient rejection depends on both the duration and amplitude of the transient. Transient amplitude is measured
from the bottom of the transient to the negative threshold voltage (V
Figure 13 shows the relationship between the transient amplitude and duration required to trigger a reset. Any
combination of duration and amplitude greater than that shown in Figure 13 generates a reset signal.
Figure 13. TPS3839 Transient Rejection
8.3.2 Manual Reset (MR) Input (TPS3831 Only)
The manual reset (MR) input allows a processor, or other logic devices, to initiate a reset (TPS3831 device only).
A logic low (0.3 VDD) on MR causes RESET to assert. After MR returns to a logic high and VDDis greater than
the threshold voltage, RESET is deasserted after the reset delay time, td, elapses. MR is internally tied to VDD
with a 20-kΩ resistor; therefore, this pin can be left unconnected if MR is not used. If a logic signal driving MR
does not go fully to VDD, some additional current draws into VDD as a result of the internal pullup resistor on MR.
To minimize current draw, a logic-level FET can be used, as shown in Figure 14.
Figure 14. Using a Logic-Level FET to Minimize Current Draw
8.4 Device Functional Modes
8.4.1 Normal Operation (VDD> V
When the voltage on VDD is greater than V
relative to V
8.4.2 Below V
When the voltage on VDD is less than V
output is asserted.
8.4.3 Below Power-On Reset (VDD< V
When the voltage on VDD is lower than the power-on reset voltage (V
not rely on the RESET output for proper device function under this condition.
, the RESET output corresponds to the voltage on the VDD pin
DD(min)
but greater than the power-on reset voltage (V
), the RESET output is undefined. Do
(POR)
), the RESET
(POR)
4.7 PH
10 PF
10 PF
5 k:
L
VINVOUT
RI
GND
FB
EN
One-Cell
Alkaline
VDD
GND
RESET
TPS3839A09
3.3 V at 40 mA
TPS61261
TPS3831, TPS3839
www.ti.com
SBVS193D –JUNE 2012–REVISED JULY 2015
9Applications 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.
9.1 Application Information
Low operating voltage and threshold options make the TPS383x devices well-suited for monitoring single-cell,
alkaline-battery applications.
9.2 Typical Application
Figure 15 shows the TPS3839A09 used to disable a boost converter when the cell voltage reaches 0.9 V, which
is the end of the discharge voltage for a single alkaline battery cell. When the cell voltage reaches 0.9 V, the
TPS61261 enable pin is driven low. This setting disables the TPS61261 and places it in a low-current shutdown
state. The combination of the TPS3839 and TPS61261 devices consumes only 250 nA (typical) from the
discharged battery.
Figure 15. Disabled Boost Converter
9.2.1 Design Requirements
Table 1 lists the design requirements for Figure 15.
Table 1. Design Requirements and Results
DESIGN REQUIREMENTS
Input voltage range of 0.9 V to 1.7 V0.9 V to 6.5 V0.8 V to 4 V0.9 V to 4 V
Shutdown current < 3 µA0.5 μA (maximum)1.5 μA (maximum)2.0 μA (maximum)
Output voltage of 3.3 VN/A3.3 V3.3 V
Output current of 50 mAN/A100 mA100 mA
Switching frequency ≥ 1 MHzN/A2.5 MHz2.5 MHz
The TPS383x devices use a unique sampling scheme to maintain an extremely low average quiescent current of
150 nA. The TPS383x devices typically consume only approximately 100 nA of dc current. However, this current
rises to approximately 15 µA for about 200 µs when the TPS383x devices sample the input voltage. If the source
impedance back to the supply voltage is high, then the additional current during sampling may trigger a false
reset as a result of the apparent voltage drop at VDD. For applications with high-impedance input supplies
(including trace impedance), TI recommends adding a small 0.1-µF bypass capacitor near the TPS3839 VDD
pin. This bypass capacitor effectively keeps the average current at 150 nA and reduces the effects of a highimpedance voltage source.
9.2.2.2 Bidirectional Reset Pins
Some devices have bidirectional reset pins that act both as an input and an output. For applications where the
TPS383x devices drive a bidirectional reset pin, place a series resistor between the TPS383x output and the
reset pin to protect against excessive current flow when both the TPS383x devices and the reset pin attempt to
drive the reset line. Figure 16 shows the connection of the TPS3839K33 to a bidirectional reset pin of a
microcontroller using a series resistor.
Figure 16. Connection to a Bidirectional Reset Pin
Figure 17. Supply Current vs Temperature
Input
Supply
1
2
RESET
Flag
3
C
VDD
TPS3831, TPS3839
www.ti.com
SBVS193D –JUNE 2012–REVISED JULY 2015
10Power Supply Recommendations
These devices are designed to operate from an input supply with a voltage range between 0.9 V and 6.5 V. Use
a low-impedance power supply to eliminate inaccuracies caused by the extra current during the input-voltage
sampling discussed in the Input Capacitor section.
11Layout
11.1 Layout Guidelines
Make sure the connection to the VDD pin is low impedance and able to carry 15 µA without a significant voltage
drop. Place a 0.1-µF bypass capacitor near the VDD pin if the 15-µA sampling current causes too much voltage
droop.
Two evaluation modules (EVMs) are available to assist in the initial circuit performance evaluation using the
TPS3831 and TPS3839. The TPS3831G33EVM-187 and TPS3839K33EVM-112 evaluation modules (and
related user's guides) can be requested at the TI website through the product folders or purchased directly from
the TI eStore.
12.1.1.2 Spice Models
Computer simulation of circuit performance using SPICE is often useful when analyzing the performance of
analog circuits and systems. SPICE models for the TPS3831 and TPS3839 devices are available through each
of the product folders under Tools & Software.
12.2 Documentation Support
12.2.1 Related Documentation
•TPS3831G33EVM-187 User's Guide, SLVU774
•TPS3839K33EVM-112 User's Guide, SLVU758.
•TPS61261 Data Sheet, SLVSA99
12.3 Related Links
Table 2 lists quick access links. Categories include technical documents, support and community resources,
tools and software, and quick access to sample or buy.
Table 2. Related Links
PARTSPRODUCT FOLDERSAMPLE & BUY
TPS3831Click hereClick hereClick hereClick hereClick here
TPS3839Click hereClick hereClick hereClick hereClick here
TECHNICALTOOLS &SUPPORT &
DOCUMENTSSOFTWARECOMMUNITY
12.4 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.
12.5 Trademarks
E2E is a trademark of Texas Instruments.
All other trademarks are the property of their respective owners.
12.6 Electrostatic Discharge Caution
These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam
during storage or handling to prevent electrostatic damage to the MOS gates.
This glossary lists and explains terms, acronyms, and definitions.
13Mechanical, Packaging, and Orderable Information
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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.
9-Jul-2015
Op Temp (°C)Device Marking
(4/5)
Samples
Addendum-Page 3
PACKAGE OPTION ADDENDUM
www.ti.com
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(3)
MSL, Peak Temp. - The Moisture Sensitivity Level rating according to the JEDEC industry standard classifications, and peak solder temperature.
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