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TPS54227DRCT Datasheet(PDF) 4 Page - Texas Instruments |
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TPS54227DRCT Datasheet(HTML) 4 Page - Texas Instruments |
4 / 26 page TPS54227 (HSOP8) PowerPAD TM 1 2 3 4 8 7 6 5 SW GND VBST VIN EN VFB VREG5 SS EN VFB VREG5 SS GND VIN VIN VBST SW SW Exposed Thermal Die PAD on Underside PGND 1 2 3 4 5 10 9 8 7 6 TPS54227 SLVSAU2B – MAY 2011 – REVISED JUNE 2013 www.ti.com ELECTRICAL CHARACTERISTICS (continued) over operating free-air temperature range, VIN = 12 V (unless otherwise noted) PARAMETER TEST CONDITIONS MIN TYP MAX UNIT ON-TIME TIMER CONTROL tON On time VIN = 12 V, VO = 1.05 V 150 ns tOFF(MIN) Minimum off time TA = 25°C, VFB = 0.7 V 260 310 ns SOFT START ISSC SS charge current VSS = 1V 1.4 2.0 2.6 μA ISSD SS discharge current VSS = 0.5 V 0.1 0.2 mA UVLO Wake up VREG5 voltage 3.45 3.75 4.05 UVLO UVLO threshold V Hysteresis VREG5 voltage 0.13 0.32 0.48 DEVICE INFORMATION DDA PACKAGE DRC PACKAGE (TOP VIEW) (TOP VIEW) PIN FUNCTIONS PIN DESCRIPTION NAME DDA DRC EN 1 1 Enable input control. EN is active high and must be pulled up to enable the device. VFB 2 2 Converter feedback input. Connect to output voltage with feedback resistor divider. 5.5 V power supply output. A capacitor (typical 1 µF) should be connected to GND. VREG5 is VREG5 3 3 not active when EN is low. SS 4 4 Soft-start control. An external capacitor should be connected to GND. Ground pin. Power ground return for switching circuit. Connect sensitive SS and VFB returns GND 5 5 to GND at a single point. SW 6 6, 7 Switch node connection between high-side NFET and low-side NFET. Supply input for the high-side FET gate drive circuit. Connect 0.1 µF capacitor between VBST VBST 7 8 and SW pins. An internal diode is connected between VREG5 and VBST. VIN 8 9, 10 Input voltage supply pin. Thermal pad of the package. Must be soldered to achieve appropriate dissipation. Must be Back side connected to GND. Exposed Thermal Pad Thermal pad of the package. PGND power ground return of internal low-side FET. Must be Back side soldered to achieve appropriate dissipation. 4 Copyright © 2011–2013, Texas Instruments Incorporated Product Folder Links: TPS54227 |
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