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LM34927 Folha de dados(PDF) 3 Page - Texas Instruments |
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LM34927 Folha de dados(HTML) 3 Page - Texas Instruments |
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3 / 28 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 LM34927 www.ti.com SNVS799G – APRIL 2012 – REVISED DECEMBER 2014 5 Pin Configuration and Functions 8-Pin SO PowerPAD DDA Package Top View Connect Exposed Pad to RTN 8-Pin WSON With Exposed Thermal Pad 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 100 V. Resistor divider from VIN to UVLO to GND programs the undervoltage detection threshold. An internal current source is Input Pin of Undervoltage 3 UVLO I enabled when UVLO is above 1.225 V to provide hysteresis. Comparator 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 4 RON I On-Time Control function of VIN. Minimum recommended on-time is 100 ns at max input voltage. This pin is connected to the inverting input of the internal 5 FB I Feedback regulation comparator. The regulation level is 1.225 V. Output from the Internal High The internal VCC regulator provides bias supply for the gate Voltage Series Pass Regulator. drivers and other internal circuitry. A 1.0- μF decoupling capacitor 6 VCC O Regulated at is recommended. 7.6 V. An external capacitor is required between the BST and SW pins 7 BST I Bootstrap Capacitor (0.01- μF 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 8 SW O Switching Node bootstrap capacitor. Exposed pad must be connected to RTN pin. Connect to system — EP — Exposed Pad ground plane on application board for reduced thermal resistance. Copyright © 2012–2014, Texas Instruments Incorporated Submit Documentation Feedback 3 Product Folder Links: LM34927 |
Nº de peça semelhante - LM34927_15 |
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Descrição semelhante - LM34927_15 |
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