LM/-Q1 does not rely on output capacitor ESR An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in. LM Synchronous 1MHz A Step-Down Voltage Regulator from the PowerWise® Family The LM Synchronously Rectified Buck Converter features all. The LM Synchronously Rectified Buck Converter Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

Author: Sazahn Zulkikree
Country: Comoros
Language: English (Spanish)
Genre: History
Published (Last): 28 June 2010
Pages: 392
PDF File Size: 20.23 Mb
ePub File Size: 6.23 Mb
ISBN: 858-6-23274-251-2
Downloads: 21932
Price: Free* [*Free Regsitration Required]
Uploader: Samusar

Nonetheless, such components are subject to these terms. In this demonstration board, a 10 nF capacitor is used.

LM datasheet, Pinout ,application circuits LM3 Molded Inductor

To ensure that the on-time is larger than the minimum limit, which is ns, the value of R1 must satisfy the following equation: For a worst case calculation, the input capacitor must be capable of supplying this average load current during the maximum on-time.

Buyers are responsible for their products and applications using TI components. The design of the demonstration board is detailed below.

The average current during the on-time is the load current. Vias should be added to connect the ground of the input capacitors to a ground plane, located as close to the capacitor as possible. Low ESR also helps ensure a complete recharge during each off-time. The capacitor at the SS pin determines the soft-start time, that datadheet, the time for the reference voltage at the regulation comparator and the output daasheet to reach their final value.

LM3 Molded Inductor

Calculate the on-time setting resistor The switching frequency fSW of the demonstration board is affected by the on-time ton of the LM, which datassheet determined by R1. Typical performance and operating waveforms are also provided for reference. Layout is therefore critical for optimum performance. The operating frequency remains constant with line variations due to the inverse relationship between the input voltage and the lm33102.

Determine the inductance The main parameter affected by the inductor is the amplitude of the inductor current ripple ILR. Buyers should obtain the latest relevant information before placing orders and should verify that such information is current and complete.

LM datasheet, Pinout ,application circuits Synchronous 1MHz A Step-Down Voltage Regulator

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. TI is not responsible or liable for such altered documentation. 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.


A load which creates significant transients requires a larger output capacitor than a fixed load. A nF capacitor is used in this demonstration board. Protection features include output over-voltage protection, thermal shutdown, VCC undervoltage lock-out, gate drive under-voltage lock-out. The demonstration board schematic, PCB layout, Bill of Materials, and circuit design descriptions are shown.

If the output voltage is higher than 1. The bootstrap capacitor C4 should be connected as close to the SW and BST pins as possible, and the connecting traces should be thick.

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. The connection from the PGND pin to the input capacitors should be as short and direct as possible. Buyer will fully indemnify TI and its representatives against any damages arising out of the use of any TI components in safety-critical applications. Additionally the use of thick traces, where possible, can help conduct heat away from the LM 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.

The exposed pad on the bottom of the LM IC package can be soldered to the ground plane, which should extend out from beneath the LM to help dissipate heat. I wish to measure a very low resistance of the order of an ohm. Judicious positioning of the PC board within the end product, along with the use of any available air flow forced or natural convection can help reduce the junction temperature.

Information of third parties may be subject to additional restrictions.

Synchronous 1MHz 2.5A Step-Down Voltage Regulator

Using numerous vias to connect the die attached pad to the ground plane is a good practice. The input capacitor is calculated from: Calculate the feedback resistors The ratio of the feedback resistors can be calculated from the following equation: 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.


Lab 6 in this note. Determine the value of other components C1 and C2: A low ESR 0. TI is not responsible or liable for any such statements. The output capacitor C10, C11 should be connected close to the load and tied directly to the ground plane. 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.

In some cases, TI components may be promoted specifically to facilitate safety-related applications. 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.

Buyer represents and agrees that it has all the necessary ml3102 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 datadheet appropriate remedial actions.

It must be as neat and compact as possible, and all external components must be as close to their associated pins of the LM as possible.

The exposed pad is internally connected to the Satasheet IC substrate. Experimentation is dztasheet necessary to determine the minimum value for the output capacitor, as the nature of the load may require a larger value. This user’s guide details the design of a demonstration board which provides a 3. The Constant On-Time COT regulation scheme requires no loop compensation, results in a fast load transient response and simple circuit implementation that allows a low component count, and consequently very small overall board space is required for a typical application.

Testing and other quality control techniques are used to the extent TI deems necessary to support this warranty.