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LM25019 データシート(PDF) 3 Page - Texas Instruments |
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LM25019 データシート(HTML) 3 Page - Texas Instruments |
3 / 27 page SW BST VCC FB 8 7 6 5 1 2 3 4 UVLO RON RTN VIN WSON-8 Exp Pad UVLO 3 RON 4 RTN 1 VIN 2 8 SW 7 BST 6 VCC 5 FB SO PowePAD-8 Exp Pad LM25019 www.ti.com SNVS952D – DECEMBER 2012 – REVISED DECEMBER 2014 5 Pin Configuration and Functions 8-Pin SO PowerPAD DDA Package Top View 8-Pin WSON NGU Package Top View Pin Functions PIN I/O DESCRIPTION APPLICATION INFORMATION NO. NAME 1 RTN — Ground Ground connection of the integrated circuit. 2 VIN I Input Voltage Operating input range is 7.5 V to 48 V. Resistor divider from VIN to UVLO to GND programs the undervoltage detection threshold. An internal 3 UVLO I Input Pin of Undervoltage Comparator current source is enabled when UVLO is above 1.225 V to provide hysteresis. When UVLO pin is pulled below 0.66 V externally, the regulator is in shutdown mode. A resistor between this pin and VIN sets the buck switch 4 RON I On-Time Control on-time as a function of VIN. Minimum recommended on-time is 100 ns at max input voltage. This pin is connected to the inverting input of the 5 FB I Feedback internal regulation comparator. The regulation level is 1.225 V. The internal VCC regulator provides bias supply for the Output from the Internal High Voltage 6 VCC O gate drivers and other internal circuitry. A 1.0- μF Series Pass Regulator. Regulated at 7.6 V decoupling capacitor is recommended. An external capacitor is required between the BST and SW pins (0.01- μF ceramic). The BST pin capacitor is 7 BST I Bootstrap Capacitor charged by the VCC regulator through an internal diode when the SW pin is low. Power switching node. Connect to the output inductor 8 SW O Switching Node and bootstrap capacitor. Exposed pad must be connected to the RTN pin. — EP — Exposed Pad Solder to the system ground plane on application board for reduced thermal resistance. Copyright © 2012–2014, Texas Instruments Incorporated Submit Documentation Feedback 3 Product Folder Links: LM25019 |
同様の部品番号 - LM25019_15 |
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同様の説明 - LM25019_15 |
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