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TPS5430 Datasheet(PDF) 5 Page - Texas Instruments |
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TPS5430 Datasheet(HTML) 5 Page - Texas Instruments |
5 / 21 page www.ti.com PIN ASSIGNMENTS PGND AGND Exposed ThermalPad (Pin25) NC VSNS 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 PGND RT NC PH PH SYNC TPS54377 SLVS779 – SEPTEMBER 2007 RHF PACKAGE (BOTTOM VIEW) TERMINAL FUNCTIONS TERMINAL DESCRIPTION NAME NO. COMP 1 Error amplifier output. Connect compensation network from COMP to VSENSE. Power good open drain output. High when VSENSE ≥ 90% Vref, otherwise PWRGD is low. Note that output is low PWRGD 2 when SS/ENA is low or internal shutdown signal active. Bootstrap input. 0.022- μF to 0.1-μF low-ESR capacitor connected from BOOT to PH generates floating drive for the BOOT 3 high-side FET driver. PH 4-9 Phase input/output. Junction of the internal high and low-side power MOSFETs, and output inductor. Power ground. High current return for the low-side driver and power MOSFET. Connect PGND with large copper PGND 11-14 areas to the input and output supply returns, and negative terminals of the input and output capacitors. Input supply for the power MOSFET switches and internal bias regulator. Bypass VIN pins to PGND pins close to VIN 15-17 device package with a high quality, low ESR 1- μF to 10-μF ceramic capacitor. Internal bias regulator output. Supplies regulated voltage to internal circuitry. Bypass VBIAS pin to AGND pin with a VBIAS 18 high quality, low ESR 0.1- μF to 1.0-μF ceramic capacitor. Slow-start/enable input/output. Dual function pin which provides logic input to enable/disable device operation and SS/ENA 19 capacitor input to externally set the start-up time. Synchronization input. Dual function pin which provides logic input to synchronize to an external oscillator or pin SYNC 20 select between two internally set switching frequencies. When used to synchronize to an external signal, a resistor must be connected to the RT pin. RT 22 Frequency setting resistor input. Connect a resistor from RT to AGND to set the switching frequency, fs. Analog ground. Return for compensation network/output divider, slow-start capacitor, VBIAS capacitor, RT resistor AGND 23, 25 and SYNC pin. Make PowerPAD connection to AGND. VSNS 24 Error amplifier inverting input. NC 10, 21 Not connected internally. Copyright © 2007, Texas Instruments Incorporated Submit Documentation Feedback 5 Product Folder Link(s): TPS54377 |
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