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TPS51218DSCT Datasheet(PDF) 6 Page - Texas Instruments |
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TPS51218DSCT Datasheet(HTML) 6 Page - Texas Instruments |
6 / 27 page 1 2 3 4 5 10 9 8 7 6 PGOOD TRIP EN VFB RF VBST DRVH SW V5IN DRVL TPS51218DSC GND DSC PACKAGE (TOP VIEW) TRIP OCL V V 8 = TPS51218 SLUS935B – MAY 2009 – REVISED FEBRUARY 2012 www.ti.com DEVICE INFORMATION Thermal pad is used as an active terminal of GND. PIN FUNCTIONS PIN I/O DESCRIPTION NAME NO. High-side MOSFET driver output. The SW node referenced floating driver. The gate drive voltage is DRVH 9 O defined by the voltage across VBST to SW node bootstrap flying capacitor Synchronous MOSFET driver output. The GND referenced driver. The gate drive voltage is defined by DRVL 6 O V5IN voltage. EN 3 I SMPS enable pin. Short to GND to disable the device. Thermal GND I Ground Pad Power Good window comparator open drain output. Pull up with resistor to 5 V or appropriate signal PGOOD 1 O voltage. Continuous current capability is 1 mA. PGOOD goes high 1 ms after VFB becomes within specified limits. Power bad, or the terminal goes low, after a 2- μs delay. Switching frequency selection. Connect a resistance to select switching frequency as shown in Table 1. The switching frequency is detected and stored into internal registers during startup. This pin also controls RF 5 I Auto-skip or forced CCM selection. Pull down to GND with resistor : Auto-Skip Connect to PGOOD with resistor: forced CCM after PGOOD becomes high. Switch node. A high-side MOSFET gate drive return. Also used for on time generation and output SW 8 I discharge. OCL detection threshold setting pin. 10 μA at room temperature, 4700 ppm/°C current is sourced and set the OCL trip voltage as follows. TRIP 2 I (0.2 V ≤ VTRIP ≤ 3 V) V5IN 7 I 5 V +30%/ –10% power supply input. Supply input for high-side MOSFET driver (bootstrap terminal). Connect a flying capacitor from this pin to VBST 10 I the SW pin. Internally connected to V5IN via bootstrap MOSFET switch. VFB 4 I SMPS feedback input. Connect the feedback resistor divider. 6 Submit Documentation Feedback Copyright © 2009–2012, Texas Instruments Incorporated Product Folder Link(s): TPS51218 |
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