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.

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Nonetheless, such components are subject to these terms. This user’s guide details the design of a demonstration board which provides a 3.

LM Datasheet(PDF) – National Semiconductor (TI)

Experimentation is usually necessary to determine the minimum value for the output capacitor, as the nature of the load may require a larger value. Low ESR also helps ensure a complete recharge during each off-time. 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.

A nF capacitor is used in this demonstration board.

LM 데이터시트(PDF) – TI store

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. 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.

Using numerous vias to connect the die attached pad to the ground plane is a good practice.

Lab 6 in this note. The bootstrap capacitor C4 should be connected as close to the SW and BST pins as possible, and the connecting traces should be thick. A load which creates significant transients requires a larger output capacitor than a fixed load.


The output capacitor C10, C11 should be connected close to the load and tied directly to the ground plane. It then drops to zero at turn-off.

LM3 Molded Inductor

The design of the demonstration board is detailed below. Additionally the use of thick traces, where possible, can help conduct heat away from the LM Products Applications Audio www.

The demonstration board schematic, PCB layout, Bill of Materials, and circuit design descriptions are shown. The average current during the on-time is the load current. 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.

Buyers should obtain the latest relevant information before placing orders and should verify that such information is current and complete. TI is not responsible or liable for any such statements. Protection features include output over-voltage protection, thermal shutdown, VCC undervoltage lock-out, gate drive under-voltage lock-out. 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.

The connection from the PGND pin to the input capacitors should be as short and direct as possible. TI is not responsible or liable for such altered documentation. Buyer will fully indemnify TI and its representatives against any damages arising out of the use of any TI components in safety-critical applications. For a worst case calculation, the input dahasheet must be capable of supplying this llm3102 load current during the maximum on-time.

Information of third parties may be subject to additional restrictions. Determine the inductance The main parameter affected by the inductor is the amplitude of the inductor current ripple ILR. Calculate the feedback resistors The ratio of daasheet feedback resistors can be calculated from the following equation: 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.


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.

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 dafasheet 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. Determine the value of other components C1 and C2: In some cases, TI components may be promoted specifically to facilitate safety-related applications.

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.

LM3102 PDF Datasheet浏览和下载

To ensure that the on-time is larger than the minimum limit, which is ns, the value of R1 must satisfy the following equation: In this demonstration board, a 10 nF capacitor is used. 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. The input capacitor is calculated from: The exposed pad is internally connected to the LM IC substrate.