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LM20343 数据表(PDF) 3 Page - Texas Instruments |
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LM20343 数据表(HTML) 3 Page - Texas Instruments |
3 / 30 page LM20343 www.ti.com SNVS559A – MAY 2008 – REVISED AUGUST 2008 PIN DESCRIPTIONS (continued) Pin(s) Name Description Application Information 19 EN Enable or UVLO input An external voltage divider can be used to set the line undervoltage lockout threshold. If the EN pin is left unconnected, a 2 µA pull-up current source pulls the EN pin high to enable the regulator. 20 RT Internal oscillator frequency adjust input Normally biased at 550 mV. An external resistor connected between RT and AGND sets the internal oscillator frequency. EP Exposed Exposed pad Exposed metal pad on the underside of the package with a weak Pad electrical connection to GND. Connect this pad to the PC board ground plane in order to improve heat dissipation. These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam during storage or handling to prevent electrostatic damage to the MOS gates. Copyright © 2008, Texas Instruments Incorporated Submit Documentation Feedback 3 Product Folder Links: LM20343 |
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