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TPS51124 Datasheet(PDF) 1 Page - Texas Instruments |
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TPS51124 Datasheet(HTML) 1 Page - Texas Instruments |
1 / 22 page www.ti.com FEATURES DESCRIPTION APPLICATIONS 75 k Ω 9 10 11 12 PGOOD1 EN1 PGOOD2 EN2 TPS51124RGE (QFN24) 13 14 15 16 VBST1 DRVL1 LL1 DRVH1 VBST2 DRVH2 LL2 DRVL2 17 8 7 6 5 4 3 2 1 18 19 20 21 22 23 24 VO1 1.05 V/10 A Q2 IRF8113 L1 Q1 IRF7821 VO2 1.5 V/10 A Q4 IRF8113 L2 Q3 IRF7821 Input Voltage 3 V to 28 V PowerPAD TM C7 R6 C3 C1 C6 C4 R3 6.8 C8 R7 R1 R2 75 R5 R4 V5IN 4.5 V to 5.5 V Power Good2 EN2 C5 C2 Power Good1 EN1 SGND PGND PGND SGND C9 SGND PGND PGND 73.2 k Ω k Ω 28.7 k Ω 22 µF 2 x 330 µF 1 µH 10 µF 0.1 µF 4.7 F 6.8 k Ω 1 F 3.3 k Ω 0.1 µF 10 µF 1 µH 2 x 330 µF TPS51124 SLVS616A – NOVEMBER 2005 – REVISED NOVEMBER 2005 DUAL SYNCHRONOUS STEP-DOWN CONTROLLER FOR LOW VOLTAGE POWER RAILS • High Efficiency, Low-Power Consumption, The TPS51124 is a dual, adaptive on-time D-CAP™ Shutdowns to <1 µA mode synchronous buck controller. The part enables system designers to cost effectively complete the • Fixed Frequency Emulated On-Time Control, suite of notebook power bus regulators with the Frequency Selectable From Three Options absolute lowest external component count and lowest • D-CAP™ Mode Enables Fast Transient standby consumption. The fixed frequency emulated Response adaptive on-time control supports seamless operation • Auto-Skip Mode between PWM mode at heavy load condition and reduced frequency operation at light load for high • Less Than 1% Initial Reference Accuracy efficiency down to milliampere range. The main • Low Output Ripple control loop for the TPS51124 uses the D-CAP mode • Wide Input Voltage Range: 3 V to 28 V that optimized for low ESR output capacitors such as POSCAP or SP-CAP promises fast transient • Output Voltage Range: 0.76 V to 5.5 V response with no external compensation. Simple and • Low-Side RDS(ON) Loss-less Current Sensing separate power good signals for each channel allow • Adaptive Gate Drivers With Integrated Boost flexibility of power sequencing. The part provides a Diode convenient and efficient operation with supply input voltages (V5IN, V5FILT) ranging from 4.5 V to 5.5 V, • Internal 1.2-ms Voltage-Servo Soft Start conversion voltages (drain voltage for the • Power-Good Signals for Each Channel With synchronous high-side MOSFET) from 3 V to 28 V Delay Timer and output voltages from 0.76 V to 5.5 V. • Output Discharge During Disable, Fault The TPS51124 is available in 24-pin QFN package specified from –40 °C to 85°C ambient temperature range. • Notebook I/O and Low Voltage System Bus 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. D-CAP, PowerPAD are trademarks of Texas Instruments. PRODUCTION DATA information is current as of publication date. Copyright © 2005, 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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