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LM34925 Folha de dados(PDF) 3 Page - Texas Instruments |
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LM34925 Folha de dados(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 LM34925 www.ti.com SNVS846F – JUNE 2012 – REVISED NOVEMBER 2014 5 Pin Configuration and Functions DDA Package 8-Pin SO PowerPAD Top View NGU Package 8-Pin WSON With Exposed Thermal Pad 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 100 V. Resistor divider from VIN to UVLO to GND programs the undervoltage Input Pin of Undervoltage detection threshold. An internal current source is enabled when UVLO is 3 UVLO I Comparator above 1.225 V to provide hysteresis. When UVLO pin is pulled below 0.66 V externally, the parts goes in shutdown mode. A resistor between this pin and VIN sets the switch on-time as a function 4 RON I On-Time Control of VIN. Minimum recommended on-time is 100ns at max input voltage. This pin is connected to the inverting input of the internal regulation 5 FB I Feedback comparator. The regulation level is 1.225 V. Output from the Internal High Voltage Series Pass The internal VCC regulator provides bias supply for the gate drivers and 6 VCC O Regulator. Regulated at other internal circuitry. A 1.0- μF decoupling capacitor is recommended. 7.6 V. An external capacitor is required between the BST and SW pins (0.01- μF 7 BST I Bootstrap Capacitor ceramic). The BST pin capacitor is charged by the VCC regulator through an internal diode when the SW pin is low. Power switching node. Connect to the output inductor and bootstrap 8 SW O Switching Node capacitor. Exposed pad must be connected to RTN pin. Connect to system ground — EP — Exposed Pad plane on application board for reduced thermal resistance. Copyright © 2012–2014, Texas Instruments Incorporated Submit Documentation Feedback 3 Product Folder Links: LM34925 |
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