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LMZ31520RLGT Datasheet(PDF) 6 Page - Texas Instruments |
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LMZ31520RLGT Datasheet(HTML) 6 Page - Texas Instruments |
6 / 30 page LMZ31520 SLVSBM9B – OCTOBER 2013 – REVISED DECEMBER 2013 www.ti.com PIN DESCRIPTIONS TERMINAL DESCRIPTION NAME NO. This pin is connected internally to the power ground of the device. This pin should only be used as the zero AGND 9 volt ground reference for connecting the voltage setting resistor (RSET). Do not connect AGND to PGND. See Layout Recommendations. 4 8 12 Do Not Connect. Do not connect these pins to AGND, to another DNC pin, or to any other voltage. These DNC 20 pins are connected to internal circuitry. Each pin must be soldered to an isolated pad. 21 35 36 Frequency Select pin. Leave this pin open (floating) to select 500 kHz (typ) operating frequency. Connect FREQ_SEL 7 this pin to V5V pin to select 850 kHz (typ) operating frequency. Connect a 66 k Ω resistor between this pin and PGND to select 300 kHz (typ) operating frequency. See Table 2 for more info. Current limit setting pin. Connecting a resistor between this pin and PGND sets the current limit. When left ILIM 6 open, refer to the Electrical Characterization table for current limit value. INH 16 Inhibit pin. Use an open drain or open collector logic device to ground this pin to control the INH function. 29 30 Not Connected. These pins are internally isolated from any signal and all other pins. Each pin must be NC 31 soldered to a pad on the PCB. These pins can be left isolated, connected to one another, or connected to any signal on the PCB. 32 45 1 5 17 33 34 37 38 39 40 41 This is the return current path for the power stage of the device. Connect these pins to the load and to the 46 bypass capacitors associated with VIN and VOUT. Pads 65, 67, 70, and 72 should be connected to PCB PGND 47 ground planes using multiple vias for good thermal performance. Not all pins are connected together internally. All pins must be connected together externally with a copper plane or pour directly under the 48 device. 49 50 51 62 63 64 65 67 70 72 6 Submit Documentation Feedback Copyright © 2013, Texas Instruments Incorporated Product Folder Links: LMZ31520 |
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