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TPS54974PWPRG4 Datasheet(PDF) 5 Page - Texas Instruments |
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TPS54974PWPRG4 Datasheet(HTML) 5 Page - Texas Instruments |
5 / 18 page www.ti.com 1 2 3 4 5 6 7 8 9 10 11 12 13 14 28 27 26 25 24 23 22 21 20 19 18 17 16 15 AGND VSENSE COMP PWRGD BOOT PH PH PH PH PH PH PH PH PH RT VIN SS/ENA VBIAS PVIN PVIN PVIN PVIN PVIN PGND PGND PGND PGND PGND PWP PACKAGE (TOP VIEW) THERMAL PAD TPS54974 SLVS458B – JANUARY 2003 – REVISED FEBRUARY 2005 Terminal Functions TERMINAL DESCRIPTION NAME NO. AGND 1 Analog ground. Return for compensation network/output divider, slow-start capacitor, VBIAS capacitor, and RT resistor. Connect PowerPAD to AGND. BOOT 5 Bootstrap output. 0.022-µF to 0.1-µF low-ESR capacitor connected from BOOT to PH generates floating drive for the high-side FET driver. COMP 3 Error amplifier output. Connect frequency compensation network from COMP to VSENSE PGND 15-19 Power ground. High current return for the low-side driver and power MOSFET. Connect PGND with large copper areas to the input and output supply returns, and negative terminals of the input and output capacitors. A single-point connection to AGND is recommended. PH 6-14 Phase output. Junction of the internal high-side and low-side power MOSFETs, and output inductor. PVIN 20-24 Input supply for the power MOSFET switches and internal bias regulator. Bypass VIN pins to PGND pins close to device package with a high-quality, low-ESR 10-µF ceramic capacitor. PWRGD 4 Power-good, open-drain output. High when VSENSE ≥ 90% V ref, otherwise PWRGD is low. Note that output is low when SS/ENA is low or the internal shutdown signal is active. RT 28 Frequency setting resistor input. Connect a resistor from RT to AGND to set the switching frequency, fs. SS/ENA 26 Slow-start/enable input/output. Dual function pin which provides logic input to enable/disable device operation and capacitor input to externally set the start-up time. VBIAS 25 Internal bias regulator output. Supplies regulated voltage to internal circuitry. Bypass VBIAS pin to AGND pin with a high-quality, low-ESR 0.1-µF to 1.0-µF ceramic capacitor. VIN 27 Input supply for the internal bias regulator. An external capacitor of 1 µF to be connected to the VIN pin. VSENSE 2 Error amplifier inverting input. Connect to output voltage compensation network/output divider. 5 |
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