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LM3100MHX Datasheet(PDF) 2 Page - Texas Instruments |
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LM3100MHX Datasheet(HTML) 2 Page - Texas Instruments |
2 / 21 page LM3100 1 2 3 4 5 6 7 8 9 10 20 19 18 17 16 15 14 13 11 12 SW SW N/C VIN VIN BST GND SS N/C N/C N/C N/C PGND PGND VCC RON EN FB N/C TST EP LM3100 SNVS421F – JANUARY 2006 – REVISED DECEMBER 2009 www.ti.com Connection Diagram Figure 1. 20-lead Plastic eTSSOP Pin Functions Pin Descriptions Pin Name Description Application Information 1,9,10,12,19,20 N/C No Connection These pins must be left unconnected. 2, 3 SW Switching Node Internally connected to the buck switch source. Connect to output inductor. 4, 5 VIN Input supply voltage Supply pin to the device. Nominal input range is 4.5V to 36V. 6 BST Connection for bootstrap capacitor Connect a 0.033µF capacitor from SW pin to this pin. An internal diode charges the capacitor during the high-side switch off-time. 7 GND Analog Ground Ground for all internal circuitry other than the synchronous switches. 8 SS Soft-start An internal 8µA current source charges an external capacitor to provide the soft- start function. 11 TST Test mode enable pin Force the device into test mode. Must be connected to ground for normal operation. 13 FB Feedback Internally connected to the regulation and over-voltage comparators. The regulation setting is 0.8V at this pin. Connect to feedback divider. 14 EN Enable pin Connect a voltage higher than 1.26V to enable the regulator. 15 RON On-time Control An external resistor from VIN to this pin sets the high-side switch on-time. 16 VCC Start-up regulator Output Nominally regulated to 6V. Connect a capacitor of not less than 680nF between VCC and GND for stable operation. 17, 18 PGND Power Ground Synchronous rectifier MOSFET source connection. Tie to power ground plane. DAP EP Exposed Pad Thermal connection pad, connect to GND. 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. 2 Submit Documentation Feedback Copyright © 2006–2009, Texas Instruments Incorporated Product Folder Links: LM3100 |
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