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LM25085 Folha de dados(PDF) 3 Page - Texas Instruments |
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LM25085 Folha de dados(HTML) 3 Page - Texas Instruments |
3 / 34 page 1 2 3 4 5 8 7 6 FB PGATE ISEN GND VCC ADJ RT VIN 8 7 6 5 4 3 2 1 Exposed Pad on Bottom Connect to Ground FB GND ADJ PGATE ISEN VCC RT VIN 1 2 3 4 5 8 7 6 Exposed Pad on Bottom Connect to Ground FB PGATE ISEN GND VCC ADJ RT VIN LM25085, LM25085-Q1 www.ti.com SNVS593J – OCTOBER 2008 – REVISED NOVEMBER 2014 5 Pin Configuration and Functions HVSSOP-PowerPad™ WSON 8-Lead DGN0008A 8-Lead NGQ0008A Top View Top View VSSOP 8-Lead DGK0008A Top View Pin Functions PIN I/O DESCRIPTION NAME NO. Current Limit Adjust - The current limit threshold is set by an external resistor from VIN to ADJ in ADJ 1 I conjunction with the external sense resistor or the PFET’s RDS(ON). On-time control and shutdown - An external resistor from VIN to RT sets the buck switch on-time and RT 2 I switching frequency. Grounding this pin shuts down the controller. Voltage Feedback from the regulated output - Input to the regulation and over-voltage comparators. FB 3 I The regulation level is 1.25V. GND 4 - Circuit Ground - Ground reference for all internal circuitry. Current sense input for current limit detection. Connect to the PFET drain when using RDS(ON) current ISEN 5 I sense. Connect to the PFET source and the sense resistor when using a current sense resistor. PGATE 6 O Gate Driver Output - Connect to the gate of the external PFET. Output of the gate driver bias regulator - Output of the negative voltage regulator (relative to VIN) that VCC 7 O biases the PFET gate driver. A low ESR capacitor is required from VIN to VCC, located as close as possible to the pins. Input supply voltage - The operating input range is from 4.5V to 42V. A low ESR bypass capacitor VIN 8 I must be located as close as possible to the VIN and GND pins. Exposed Pad - Exposed pad on the underside of the package (HVSSOP-PowerPAD-8 and WSON EP - only). This pad is to be soldered to the PC board ground plane to aid in heat dissipation. Copyright © 2008–2014, Texas Instruments Incorporated Submit Documentation Feedback 3 Product Folder Links: LM25085 LM25085-Q1 |
Nº de peça semelhante - LM25085 |
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Descrição semelhante - LM25085 |
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