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| TPS5403 Datasheet, PDF (3/18 Pages) Texas Instruments – 4.5-V TO 28-V INPUT VOLTAGE, 3.3-V FIXED OUTPUT, 1.7-A OUTPUT CURRENT, NON-SYNCHRONOUS STEP-DOWN REGULATOR WITH INTEGRATED MOSFET | |||
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www.ti.com
PCB LAYOUT
GROUND
VOUT
VIN
1 BOOT
LX 8
2 VIN
GND 7
3 ROSC COMP 6
4 SS VSENSE 5
TPS5403
SLVSBK5 â SEPTEMBER 2012
TA
â40°C to 85°C
PACKAGE (2)
8-pin SOIC (D)
ORDERING INFORMATION(1)
ORDERABLE PART NUMBER
TPS5403DR
TOP-SIDE MARKING
TPS5403
(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
D PACKAGE
(TOP VIEW)
BOOT
1
VIN
2
ROSC
3
SS
4
8
LX
7
GND
6
COMP
5
VSENSE
NAME
BOOT
VIN
ROSC
SS
VSENSE
COMP
GND
LX
TERMINAL FUNCTIONS
NO.
DESCRIPTION
1
A 0.1-µF bootstrap capacitor is required between BOOT and LX.
2
Input supply voltage, 4.5 V to 28 V
Switching frequency program pin. Connect a resistor to this pin to set the switching frequency. Connect the
3
pin to ground for a default 70-kHz switching frequency. Leave the pin open for 120-kHz switching
frequency.
4
Soft start pin. An external capacitor connected to this pin sets the output rise time.
5
Output voltage feedback pin
6
Error amplifier output and input to the PWM comparator. Connect frequency compensation components to
this pin.
7
Ground
8
Switching node to external inductor
Copyright © 2012, Texas Instruments Incorporated
Product Folder Links: TPS5403
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