TPS54350PWPR Datasheet, PDF (1/32 Pages) Texas Instruments – 4.5-V TO 20-V INPUT, 3-A OUTPUT SYNCHRONOUS PWM SWITCHER WITH INTEGRANTED FET(SWIFT)

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6,4 mm y 5,0 mm
TPS54350
SLVS456C − OCTOBER 2003 − REVISED OCTOBER 2004
4.5ĆV TO 20ĆV INPUT, 3ĆA OUTPUT SYNCHRONOUS PWM
SWITCHER WITH INTEGRATED FET (SWIFT)
FEATURES
D 100 mΩ, 4.5-A Peak MOSFET Switch for High
Efficiency at 3-A Continuous Output Current
D Uses External Lowside MOSFET or Diode
D Output Voltage Adjustable Down to 0.891 V
With 1% Accuracy
D Synchronizes to External Clock
D 1805 Out of Phase Synchronization
D Wide PWM Frequency − Fixed 250 kHz,
500 kHz or Adjustable 250 kHz to 700 kHz
D Internal Slow Start
D Load Protected by Peak Current Limit and
Thermal Shutdown
D Adjustable Undervoltage Lockout
D 16-Pin TSSOP PowerPADE Package
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
VIN
Input
Voltage
PWRGD
ENA
VBIAS
COMP
BOOT
PH
LSG
Output
Voltage
PGND
VSENSE
PWRPAD
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.
EFFICIENCY
vs
LOAD CURRENT
95
90
85
80
75
70
65
60
VI = 12 V
55
VO = 5 V
fS = 250 kHz
50
0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5
IL − Load Current − A
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