Datasheet

BOOT 1
2
3
4 5
6
7
8
VIN
ROSC
GND
COMP
VSENSESS
LX
D PACKAGE
(TOP VIEW)
GROUND
VOUT
VIN
BOOT1
2
3
4 5
6
7
8
VIN
SS
GND
COMP
VSENSE
ROSC
LX
TPS5402
www.ti.com SLVSBK4 –SEPTEMBER 2012
PCB LAYOUT
ORDERING INFORMATION
(1)
T
A
PACKAGE
(2)
ORDERABLE PART NUMBER TOP-SIDE MARKING
–40°C to 85°C 8-pin SOIC (D) TPS5402DR TPS5402
(1) For the most current package and ordering information, see the Package Option Addendum at the end of this document, or see the TI
web site at www.ti.com.
(2) Package drawings, thermal data, and symbolization are available at www.ti.com/packaging.
PIN OUT
TERMINAL FUNCTIONS
NAME NO. DESCRIPTION
BOOT 1 A 0.1-µF bootstrap capacitor is required between BOOT and LX.
VIN 2 Input supply voltage, 3.5 V to 28 V
Switching frequency program pin. Connect a resistor to this pin to set the switching frequency. Connect the
ROSC 3 pin to ground for a default 70-kHz switching frequency. Leave the pin open for 120-kHz switching
frequency.
SS 4 Soft start pin. An external capacitor connected to this pin sets the output rise time.
VSENSE 5 Output voltage feedback pin
Error amplifier output and input to the PWM comparator. Connect frequency compensation components to
COMP 6
this pin.
GND 7 Ground
LX 8 Switching node to external inductor
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