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TPS54314PWPG4 Datasheet(PDF) 5 Page - Texas Instruments |
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TPS54314PWPG4 Datasheet(HTML) 5 Page - Texas Instruments |
5 / 22 page TPS54311, TPS54312 TPS54313, TPS54314 TPS54315, TPS54316 SLVS416B − FEBRUARY 2002 − REVISED APRIL 2005 www.ti.com 5 PIN ASSIGNMENTS 1 2 3 4 5 6 7 8 9 10 20 19 18 17 16 15 14 13 12 11 AGND VSENSE NC PWRGD BOOT PH PH PH PH PH RT FSEL SS/ENA VBIAS VIN VIN VIN PGND PGND PGND PWP PACKAGE (TOP VIEW) NC − No internal connection Terminal Functions TERMINAL DESCRIPTION NAME NO. DESCRIPTION AGND 1 Analog ground. Return for compensation network/output divider, slow-start capacitor, VBIAS capacitor, RT resistor and FSEL pin. Make PowerPAD connection to AGND. BOOT 5 Bootstrap input. 0.022-µF to 0.1-µF low-ESR capacitor connected from BOOT to PH generates floating drive for the high-side FET driver. FSEL 19 Frequency select input. Provides logic input to select between two internally set switching frequencies. NC 3 No connection PGND 11−13 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. PH 6−10 Phase input/output. Junction of the internal high and low-side power MOSFETs, and output inductor. PWRGD 4 Power good open drain output. Hi-Z when VSENSE ≥ 90% Vref, otherwise PWRGD is low. Note that output is low when SS/ENA is low or internal shutdown signal active. RT 20 Frequency setting resistor input. Connect a resistor from RT to AGND to set the switching frequency, fs. SS/ENA 18 Slow-start/enableinput/output. Dual function pin which provides logic input to enable/disable device operation and capacitor input to externally set the start-up time. VBIAS 17 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 14−16 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 1-µF to 10-µF ceramic capacitor. VSENSE 2 Error amplifier inverting input. Connect directly to output voltage sense point. |
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