6,4 mm
y
5,0 mm
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TPS54350
SLVS456C − OCTOBER 2003 − REVISED OCTOBER 2004
4.5 V TO 20 V INPUT, 3 A OUTPUT SYNCHRONOUS PWM
SWITCHER WITH INTEGRATED FET (SWIFT)
FEATURES
D
100 mΩ, 4.5-A Peak MOSFET Switch for High
D
D
D
D
D
D
D
D
D
Efficiency at 3-A Continuous Output Current
Uses External Lowside MOSFET or Diode
Output Voltage Adjustable Down to 0.891 V
With 1% Accuracy
Synchronizes to External Clock
1805 Out of Phase Synchronization
Wide PWM Frequency − Fixed 250 kHz,
500 kHz or Adjustable 250 kHz to 700 kHz
Internal Slow Start
Load Protected by Peak Current Limit and
Thermal Shutdown
Adjustable Undervoltage Lockout
16-Pin TSSOP PowerPADE Package
DESCRIPTION
The TPS54350 is a medium output current synchronous
buck PWM converter with an integrated high side
MOSFET and a gate driver for an optional low side
external MOSFET. Features include a high performance
voltage error amplifier that enables maximum
performance under transient conditions and flexibility in
choosing the output filter inductors and capacitors. The
TPS54350 has an under-voltage-lockout circuit to prevent
start-up until the input voltage reaches 4.5 V; an internal
slow-start circuit to limit in-rush currents; and a power good
output to indicate valid output conditions. The
synchronization feature is configurable as either an input
or an output for easy 180° out of phase synchronization.
The TPS54350 device is available in a thermally
enhanced 16-pin TSSOP (PWP) PowerPAD package.
TI provides evaluation modules and the SWIFT Designer
software tool to aid in quickly achieving high-performance
power supply designs to meet aggressive equipment
development cycles.
APPLICATIONS
D
Industrial & Commercial Low Power Systems
D
LCD Monitors and TVs
D
Computer Peripherals
D
Point of Load Regulation for High
Performance DSPs, FPGAs, ASICs and
Microprocessors
Simplified Schematic
TPS54350
SYNC
PWRGD
ENA
VBIAS
COMP
LSG
PGND
VSENSE
PWRPAD
VIN
Input
Voltage
EFFICIENCY
vs
LOAD CURRENT
95
90
85
Efficiency − %
BOOT
PH
80
75
70
65
60
55
50
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
IL − Load Current − A
VI = 12 V
VO = 5 V
fS = 250 kHz
Output
Voltage
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments
semiconductor products and disclaimers thereto appears at the end of this data sheet.
PowerPAD and SWIFT are trademarks of Texas Instruments.
PRODUCTION DATA information is current as of publication date. Products
conform to specifications per the terms of Texas Instruments standard warranty.
Production processing does not necessarily include testing of all parameters.
Copyright
2003 − 2004, Texas Instruments Incorporated
TI [ TEXAS INSTRUMENTS ]
