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TPS54226PW Datasheet(PDF) 5 Page - Texas Instruments

Part # TPS54226PW
Description  4.5V to 18V Input 2-A Synchronous Step-Down SWIFTTM Converter with Light Load Efficiency
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI - Texas Instruments

TPS54226PW Datasheet(HTML) 5 Page - Texas Instruments

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background image
SW
VBST
EN
VO
VFB
GND
PGND
VO
4
6
9
10
11
1
2
7
12
VIN
SS
VIN
VREG5
EN
Logic
SW
PGND
UV
OV
Protection
Logic
Ref
SS
UV
OV
UVLO
UVLO
Softstart
SS
REF
TSD
Ref
VREG5
5
PG
14
13
8
VCC
Ceramic
Capacitor
3
SGND
SGND
PGND
VCC
+20%
-10%
Ref
SW
PGND
ZC
-20%
VREG5
VREG5
TPS54226
www.ti.com
SLVSA14A – OCTOBER 2009 – REVISED OCTOBER 2009
PIN FUNCTIONS (continued)
PIN
DESCRIPTION
NAME
NO.
SS
4
Soft-start control. A external capacitor should be connected to GND.
GND
5
Signal ground pin
PG
6
Open drain power good output
EN
7
Enable control input
Ground returns for low-side MOSFET. Also serve as inputs of current comparators. Connect PGND and
PGND1, PGND2
8, 9
GND strongly together near the IC.
Switch node connection between high-side NFET and low-side NFET. Also serve as inputs to current
SW1, SW2
10, 11
comparators.
Supply input for high-side NFET gate driver (boost terminal). Connect capacitor from this pin to
VBST
12
respective SW1, SW2 terminals. An internal PN diode is connected between VREG5 to VBST pin.
VIN
13
Power input and connected to high side NFET drain
VCC
14
Supply input for 5 V internal linear regulator for the control circuitry
Thermal pad of the package. Must be soldered to achieve appropriate dissipation. Should be connected
PowerPAD™
Back side
to PGND.
FUNCTIONAL BLOCK DIAGRAM
Copyright © 2009, Texas Instruments Incorporated
5
Product Folder Link(s): TPS54226


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