Texas Instruments | TPS62130A Differences to TPS62130 | Application notes | Texas Instruments TPS62130A Differences to TPS62130 Application notes

Texas Instruments TPS62130A Differences to TPS62130 Application notes
Application Report
SLVA644 – April 2014
TPS62130A Differences to TPS62130
Chris Glaser ........................................................................................................... Low Power DC/DC
ABSTRACT
The TPS62130A device differs from the TPS62130 device only in how the PG (power good) pin is
controlled when the device is disabled, in UVLO, or in thermal shutdown. The TPS62130A holds the PG
pin low during these conditions, while the TPS62130 sets the PG pin high impedance (floating). This is
typically only a concern in a system that uses multiple voltage rails or where an output discharge function
is required. The devices are pin-to-pin compatible. This application report applies to the entire family of
TPS621x0A or TLV621x0A devices: TPS62130A, TPS62140A, TPS62150A, TLV62130A, and
TLV62150A. Throughout this document, the abbreviation TPS62130/A refers to both the TPS62130 and
TPS62130A.
PG Pin Operation Difference
Configuration 1: PG Pin Pulled Up to the Output Voltage
Figure 1 and Figure 2 show the difference in PG pin operation when the TPS62130/A is disabled without
an output load. For these waveforms, the PG pin is connected to the 3.3-V output voltage through a pullup resistor. In this configuration, there is only a difference in the time it takes for the PG pin to go low. The
PG pin goes low in both cases. With an increasing output load, the PG pin goes low faster in both cases.
Figure 1. TPS62130 PG Behavior with PG Pulled up to the Output Voltage
SLVA644 – April 2014
Submit Documentation Feedback
TPS62130A Differences to TPS62130
Copyright © 2014, Texas Instruments Incorporated
1
www.ti.com
Figure 2. TPS62130A PG Behavior with PG Pulled up to the Output Voltage
Configuration 2: PG Pin Pulled Up to a System Rail
Figure 3 and Figure 4 show the difference in PG pin operation when the TPS62130/A is disabled without
an output load and the PG pin is connected, through a pull-up resistor, to a 1.8-V system rail which is not
the 3.3-V output voltage of the TPS62130/A. In this configuration, there is an important difference between
the device’s performance, as the PG pin goes low with the TPS62130A but remains high with the
TPS62130.
Figure 3. TPS62130 PG Behavior with PG Pulled up to a System Rail
2
TPS62130A Differences to TPS62130
SLVA644 – April 2014
Submit Documentation Feedback
Copyright © 2014, Texas Instruments Incorporated
www.ti.com
Figure 4. TPS62130A PG Behavior with PG Pulled up to a System Rail
Using the PG Pin as an Output Discharge
When the PG pin is connected to the output voltage through a pull-up resistor, it may be used as an
output discharge circuit on the TPS62130A device. If this is desired, size the pull-up resistor to allow a
maximum of 10 mA to flow through the PG pin from the output voltage to ground. Higher currents violate
the absolute maximum rating of the PG pin.
Figure 5 shows the difference in output discharge when the TPS62130A is disabled and the PG pin is
connected, through a 332-Ω pull-up resistor, to the 3.3-V output voltage. The TPS62130A discharges the
output voltage to 0V much faster than with the usual 100-kΩ pull-up resistor used in Figure 2.
Figure 5. TPS62130A Output Discharge
Conclusion
The TPS62130A device provides some application benefits over the TPS62130 device. These include
easier integration into multi-rail systems, as well as an output discharge function. For these reasons, the
TPS62130A device is generally recommended over the TPS62130. The devices are pin-to-pin compatible.
SLVA644 – April 2014
Submit Documentation Feedback
TPS62130A Differences to TPS62130
Copyright © 2014, Texas Instruments Incorporated
3
IMPORTANT NOTICE
Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, enhancements, improvements and other
changes to its semiconductor products and services per JESD46, latest issue, and to discontinue any product or service per JESD48, latest
issue. Buyers should obtain the latest relevant information before placing orders and should verify that such information is current and
complete. All semiconductor products (also referred to herein as “components”) are sold subject to TI’s terms and conditions of sale
supplied at the time of order acknowledgment.
TI warrants performance of its components to the specifications applicable at the time of sale, in accordance with the warranty in TI’s terms
and conditions of sale of semiconductor products. Testing and other quality control techniques are used to the extent TI deems necessary
to support this warranty. Except where mandated by applicable law, testing of all parameters of each component is not necessarily
performed.
TI assumes no liability for applications assistance or the design of Buyers’ products. Buyers are responsible for their products and
applications using TI components. To minimize the risks associated with Buyers’ products and applications, Buyers should provide
adequate design and operating safeguards.
TI does not warrant or represent that any license, either express or implied, is granted under any patent right, copyright, mask work right, or
other intellectual property right relating to any combination, machine, or process in which TI components or services are used. Information
published by TI regarding third-party products or services does not constitute a license to use such products or services or a warranty or
endorsement thereof. Use of such information may require a license from a third party under the patents or other intellectual property of the
third party, or a license from TI under the patents or other intellectual property of TI.
Reproduction of significant portions of TI information in TI data books or data sheets is permissible only if reproduction is without alteration
and is accompanied by all associated warranties, conditions, limitations, and notices. TI is not responsible or liable for such altered
documentation. Information of third parties may be subject to additional restrictions.
Resale of TI components or services with statements different from or beyond the parameters stated by TI for that component or service
voids all express and any implied warranties for the associated TI component or service and is an unfair and deceptive business practice.
TI is not responsible or liable for any such statements.
Buyer acknowledges and agrees that it is solely responsible for compliance with all legal, regulatory and safety-related requirements
concerning its products, and any use of TI components in its applications, notwithstanding any applications-related information or support
that may be provided by TI. Buyer represents and agrees that it has all the necessary expertise to create and implement safeguards which
anticipate dangerous consequences of failures, monitor failures and their consequences, lessen the likelihood of failures that might cause
harm and take appropriate remedial actions. Buyer will fully indemnify TI and its representatives against any damages arising out of the use
of any TI components in safety-critical applications.
In some cases, TI components may be promoted specifically to facilitate safety-related applications. With such components, TI’s goal is to
help enable customers to design and create their own end-product solutions that meet applicable functional safety standards and
requirements. Nonetheless, such components are subject to these terms.
No TI components are authorized for use in FDA Class III (or similar life-critical medical equipment) unless authorized officers of the parties
have executed a special agreement specifically governing such use.
Only those TI components which TI has specifically designated as military grade or “enhanced plastic” are designed and intended for use in
military/aerospace applications or environments. Buyer acknowledges and agrees that any military or aerospace use of TI components
which have not been so designated is solely at the Buyer's risk, and that Buyer is solely responsible for compliance with all legal and
regulatory requirements in connection with such use.
TI has specifically designated certain components as meeting ISO/TS16949 requirements, mainly for automotive use. In any case of use of
non-designated products, TI will not be responsible for any failure to meet ISO/TS16949.
Products
Applications
Audio
www.ti.com/audio
Automotive and Transportation
www.ti.com/automotive
Amplifiers
amplifier.ti.com
Communications and Telecom
www.ti.com/communications
Data Converters
dataconverter.ti.com
Computers and Peripherals
www.ti.com/computers
DLP® Products
www.dlp.com
Consumer Electronics
www.ti.com/consumer-apps
DSP
dsp.ti.com
Energy and Lighting
www.ti.com/energy
Clocks and Timers
www.ti.com/clocks
Industrial
www.ti.com/industrial
Interface
interface.ti.com
Medical
www.ti.com/medical
Logic
logic.ti.com
Security
www.ti.com/security
Power Mgmt
power.ti.com
Space, Avionics and Defense
www.ti.com/space-avionics-defense
Microcontrollers
microcontroller.ti.com
Video and Imaging
www.ti.com/video
RFID
www.ti-rfid.com
OMAP Applications Processors
www.ti.com/omap
TI E2E Community
e2e.ti.com
Wireless Connectivity
www.ti.com/wirelessconnectivity
Mailing Address: Texas Instruments, Post Office Box 655303, Dallas, Texas 75265
Copyright © 2014, Texas Instruments Incorporated
Was this manual useful for you? yes no
Thank you for your participation!

* Your assessment is very important for improving the work of artificial intelligence, which forms the content of this project

Related manuals

Download PDF

advertising