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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A nF capacitor is used in this demonstration board. The exposed pad is internally connected to the LM IC substrate.

LM3102 PDF Datasheet浏览和下载

Once ILR is selected, L can be determined by: Products Applications Audio www. Calculate the feedback resistors The ratio of the feedback resistors can be calculated from the following equation: 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.

Buyers are responsible for their products and applications using TI components. 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.

Determine the value of other components C1 and C2: The input capacitor is calculated from: Judicious positioning of the PC board within the end product, along with the use of any available air satasheet forced or natural convection can help reduce the junction temperature. No TI components are authorized for use in FDA Class III or similar life-critical medical equipment ln3102 authorized officers of the parties have executed a special agreement specifically governing such use.


Testing and other quality control techniques are used to the extent TI deems necessary to support this warranty. The output capacitor C10, C11 should be connected close to the load and tied directly to the ground plane.

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

It then drops to zero at turn-off. A low ESR 0. The operating frequency remains constant with line variations due to the inverse relationship between the input voltage and the on-time. A load which creates significant transients requires a larger output capacitor than a fixed load.

Typical performance and operating waveforms are also provided for reference. The bootstrap capacitor C4 should be connected as close to the SW and BST pins as possible, and the connecting traces should be thick. The capacitor at the SS pin determines the soft-start time, that is, the time for the reference voltage at the regulation comparator and the output voltage to reach their final value.

Using numerous vias to connect the die attached pad to the ground plane is a good practice. If the output voltage is higher than 1. The connection from the PGND pin to the input capacitors should be as short and direct as possible. The design of the demonstration board is detailed below. 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.

Determine the inductance The main parameter affected by the inductor is the amplitude of the inductor current ripple ILR. This user’s guide details the design of a demonstration board which provides a 3.

LMQ1 from Texas Instruments

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 exposed pad on the bottom of the LM IC package can be soldered to the ground plane, which should extend out from beneath the Datasgeet to help dissipate heat.

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 is determined by R1. Nonetheless, such components are subject to these terms. In this demonstration board, a 10 nF capacitor is used. Except where mandated by applicable law, testing of all parameters of each component is not necessarily performed.

How much energy is. Vias should be added to connect the ground of the input capacitors to a ground plane, located as close to the capacitor as possible.