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TPS54380 Datasheet(PDF) 5 Page - Texas Instruments |
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TPS54380 Datasheet(HTML) 5 Page - Texas Instruments |
5 / 15 page TPS54380 SLVS454A − JANUARY 2003 − REVISED JUNE 2003 www.ti.com 5 1 2 3 4 5 6 7 8 9 10 20 19 18 17 16 15 14 13 12 11 AGND VSENSE COMP PWRGD BOOT PH PH PH PH PH RT ENA TRACKIN VBIAS VIN VIN VIN PGND PGND PGND PWP PACKAGE (TOP VIEW) THERMAL PAD TERMINAL FUNCTIONS TERMINAL DESCRIPTION NAME NO. DESCRIPTION AGND 1 Analog ground. Return for compensation network/output divider, slow-start capacitor, VBIAS capacitor, 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 ENA 19 Enable input. Logic high enables oscillator, PWM control and MOSFET driver circuits. Logic low disables operation and places device in low quiescent current state. 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. A single point connection to AGND is recommended. PH 6−10 Phase output. Junction of the internal high-side and low-side power MOSFETs, and output inductor. PWRGD 4 Power good open drain output. High when VSENSE ≥ 90% Vref, otherwise PWRGD is low. RT 20 Frequency setting resistor input. Connect a resistor from RT to AGND to set the switching frequency. TRACKIN 18 External reference input. High impedance input to internal reference/multiplexer and error amplifier circuits. 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 10- µF ceramic capacitor. VSENSE 2 Error amplifier inverting input. Connect to output voltage through compensation network/output divider. |
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