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TPS54350PWP-TPS54350PWPG4-TPS54350PWPR-TPS54350PWPRG4
4.5 to 20V Input, 3A Step Down Converter with Adjustable Output Voltage
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SLVS456C − OCTOBER 2003 − REVISED OCTOBER 2004
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FEATURES 100 mΩ, 4.5-A Peak MOSFET Switch for High
Efficiency at 3-A Continuous Output Current Uses External Lowside MOSFET or Diode Output Voltage Adjustable Down to 0.891V
With 1% Accuracy Synchronizes to External Clock 180� 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 PowerPAD� Package
APPLICATIONS Industrial & Commercial Low Power Systems LCD Monitors and TVs Computer Peripherals Point of Load Regulation for High
Performance DSPs, FPGAs, ASICs and
MicroprocessorsInput
Simplified Schematic
DESCRIPTIONThe 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.
0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5
EFFICIENCY
LOAD CURRENT
Efficiency − %
IL − Load Current − A
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