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TPS51103DRCT Datasheet(PDF) 6 Page - Texas Instruments |
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TPS51103DRCT Datasheet(HTML) 6 Page - Texas Instruments |
6 / 17 page VIN Switch over (ON) Turn on Clock Turn off clock Vt3_V5IN = 4.6 V Vt4_V5IN = 1.7 V Vt2_V3IN = 3.03 V Vt1_V3IN = 3.07 V T0 = 1 ms T1 = 1 ms Vt2_V5IN = 4.65 V Vt1_V5IN = 2.0 V VRTC3 EN5 EN3 VREG5 VREG3 V5IN V3IN VCLK UDG-08016 Switch over (OFF) Switch over (OFF) Switch over (ON) DETAILED DESCRIPTION GENERAL DESCRIPTION TPS51103 SLUS808 – JUNE 2008 ...................................................................................................................................................................................................... www.ti.com Figure 1. Power Sequencing The TPS51103 integrates three LDOs. The VREG5 and VREG3 can each deliver 100 mA of current. The device includes glitch free switch-over circuits which turn off VREG5 and VREG3 LDOs and switch VREG5 and VREG3 to V5IN and V3IN external power inputs respectively when the external high efficiency 5V and 3.3V power rails are available. It improves overall system efficiency and therefore extends battery life. An additional 5-mA VRTC3 LDO is designed to provide an always on feature for the real time clock (RTC). A 5-V clock with 50% duty cycle runs at 250 kHz. It can be used as a simple external charge pump driver to generate a 10-V or 15-V low-current voltage rail (see Figure 2). In the notebook application, the 10 V or 15 V created by this circuit could be used to drive an N-channel MOSFET instead of the traditional P-channel MOSFET load switch. The TPS51103 boosts performance and reduce the cost of load switch. 6 Submit Documentation Feedback Copyright © 2008, Texas Instruments Incorporated Product Folder Link(s): TPS51103 |
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