Datasheet

1
2
3
4
5
6
7
8
SW
GND
VBST
VIN
EN
VFB
VREG5
SS
TPS54528
Exposed
Thermal Pad
TPS54528
www.ti.com SLVSAY4C –JULY 2011–REVISED MARCH 2014
6 Terminal Configuration and Functions
DDA-8 PACKAGE
(TOP VIEW)
Terminal Functions
TERMINAL
DESCRIPTION
NAME NO.
EN 1 Enable input control. EN is active high and must be pulled up to enable the device.
VFB 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 not active
VREG5 3
when EN is low.
SS 4 Soft-start control. An external capacitor should be connected to GND.
Ground terminal. Power ground return for switching circuit. Connect sensitive SS and VFB returns to
GND 5
GND at a single point.
SW 6 Switch node connection between high-side NFET and low-side NFET.
Supply input for the high-side FET gate drive circuit. Connect 0.1µF capacitor between VBST and SW
VBST 7
terminals. An internal diode is connected between VREG5 and VBST.
VIN 8 Input voltage supply terminal.
Exposed Thermal Thermal pad of the package. Must be soldered to achieve appropriate dissipation. Must be connected to
Back side
Pad GND.
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