Synchronous-Buck PWM Switcher - Texas Instruments
Description
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TPS54311, TPS54312, TPS54313 TPS54314, TPS54315, TPS54316
SLVS416C – FEBRUARY 2002 – REVISED JANUARY 2015
TPS5431x 3-V to 6-V Input, 3-A Output Synchronous Buck PWM Switcher With Integrated FETs (SWIFT™)
1 Features
•1 60-mΩ, MOSFET Switches for High Efficiency at 3-A Continuous Output Source and Sink Current
• 0.
9-V, 1.
2-V, 1.
5-V, 1.
8-V, 2.
5-V, and 3.
3-V Fixed Output Voltage Devices With 1.
0% Initial Accuracy
• Internally Compensated for Low Parts Count • Fast Transient Response • Wide PWM Frequency − Fixed 350 kHz, 550 kHz
or Adjustable 280 kHz to 700 kHz • Load Protected by Peak Current Limit and
Thermal Shutdown • Integrated Solution Reduces Board Area and
Total Cost
2 Applications
• Low-Voltage, High-Density Systems With Power Distributed at 5 V or 3.
3 V
• Point of Load Regulation for High Performance DSPs, FPGAs, ASICs and Microprocessors
• Broadband, Networking and Optical Communications Infrastructure
• Portable Computing/Notebook PCs
Input
Simplified Schematic
VIN
PH
TPS54316
BOOT
PGND VBIAS
VSENSE
GND
Output
3 Description
As members of the SWIFT™ family of DC - DC regulators, the TPS54311, TPS54312, TPS54313, TPS54314, TPS54315 and TPS54316 low-inputvoltage high-outputcurrent synchronous-buck PWM converters integrate all required active components.
Included on the substrate with the listed features are a true, high performance, voltage error amplifier that provides high performance under transient conditions; an undervoltage-lockout circuit to prevent start-up until the input voltage reaches 3 V; an internally and externally set slow-start circuit to limit in-rush currents; and a powergood output useful for processor/logic reset, fault signaling, and supply sequencing.
The TPS54311, TPS54312, TPS54313, TPS54314, TPS54315 and TPS54316 devices are available in a thermally enhanced 20-pin HTSSOP (PWP) PowerPAD™ package, which eliminates bulky heatsinks.
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