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TPS51125A Datasheet(PDF) 1 Page - Texas Instruments |
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TPS51125A Datasheet(HTML) 1 Page - Texas Instruments |
1 / 39 page TPS51125A www.ti.com SLUS976F – SEPTEMBER 2009 – REVISED SEPTEMBER 2012 Dual-Synchronous, Step-Down Controller with Out-of-Audio™ Operation and 100-mA LDOs for Notebook System Power Check for Samples: TPS51125A 1 FEATURES APPLICATIONS 2 • Wide Input Voltage Range: 5.5 V to 28 V • Notebook Computers • Output Voltage Range: 2 V to 5.5 V • I/O Supplies • Built-in 100-mA 5-V/3.3-V LDO with Switches • System Power Supplies • Built-in 1% 2-V Reference Output DESCRIPTION • With/Without Out-of-Audio™ Mode Selectable The TPS51125A is a cost effective, dual-synchronous Light Load and PWM only Operation buck controller targeted for notebook system power • Internal 1.6-ms Voltage Servo Softstart supply solutions. It provides 5-V and 3.3-V LDOs and • Adaptive On-Time Control Architecture with requires few external components. The 270-kHz VCLK output can be used to drive an external charge Four Selectable Frequency Setting pump, generating gate drive voltage for the load • 4500 ppm/°C RDS(on) Current Sensing switches without reducing the main converter’s • Built-In Output Discharge efficiency. The TPS51125A supports high efficiency, • Power Good Output fast transient response and provides a combined power-good signal. Out-of-Audio™ mode light-load • Built-in OVP/UVP/OCP operation enables low acoustic noise at much higher • Thermal Shutdown (Non-latch) efficiency than conventional forced PWM operation. • QFN24 (RGE) Adaptive on-time D-CAP™ control provides convenient and efficient operation. The part operates with supply input voltages ranging from 5.5 V to 28 V and supports output voltages from 2 V to 5.5 V. The TPS51125A is available in a 24-pin QFN package and is specified from -40°C to 85°C ambient temperature range. Table 1. Differences between the TPS51125 and TPS51125A TPS51125 TPS51125A VREG5: at least 33 µF VREG5: 10 µF or larger (X5R or X7R) VREG3: at most 10 µF VREG3: 10 µF or larger (X5R or X7R) LDO Output Capacitance Requirement (1 µF acceptable at no load) (1 µF acceptable at no load) VREF: 0.22 µF to 1 µF VREF: 0.22 µF to 1 µF (X5R or X7R) 1 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. 2 Out-of-Audio, D-CAP are trademarks of Texas Instruments. PRODUCTION DATA information is current as of publication date. Copyright © 2009–2012, Texas Instruments Incorporated Products conform to specifications per the terms of the Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters. |
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