TPS54229 Datasheet, PDF (5/24 Pages) Texas Instruments – 4.5V to 18V INPUT, 2-A SYNCHRONOUS STEP DOWN CONVERTER WITH INTEGRATED FET

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TPS54229
SLVSAZ8A – SEPTEMBER 2011 – REVISED MARCH 2012
DEVICE INFORMATION
DDA PACKAGE
(TOP VIEW)
1 VBST
2 _VIN
3 SW
SS 8
TPS54229
DDA
(HSOP8)
Power PAD
EN 7
VREG5 6
4 GND
VFB 5
PIN
NAME
NO.
VBST
1
VIN
2
SW
3
GND
4
VFB
5
VREG5
6
EN
SS
Exposed Thermal
Pad
7
8
Back side
PIN FUNCTIONS
DESCRIPTION
Supply input for the high-side FET gate drive circuit. Connect 0.1µF capacitor between VBST and SW
pins. An internal diode is connected between VREG5 and VBST.
Input voltage supply pin.
Switch node connection between high-side NFET and low-side NFET.
Ground pin. Power ground return for switching circuit. Connect sensitive SS and VFB returns to GND at
a single point.
Converter feedback input. Connect to output voltage with feedback resistor divider.
5.5 V power supply output. A capacitor (typical 0.47µF) should be connected to GND. VREG5 is not
active when EN is low.
Enable input control. EN is active high and must be pulled up to enable the device.
Soft-start control. An external capacitor should be connected to GND.
Thermal pad of the package. Must be soldered to achieve appropriate dissipation. Must be connected to
GND.
Copyright © 2011–2012, Texas Instruments Incorporated
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Product Folder Link(s): TPS54229