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TPS62745DSST Datasheet(PDF) 10 Page - Texas Instruments |
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TPS62745DSST Datasheet(HTML) 10 Page - Texas Instruments |
10 / 34 page UVLO EN Gate Driver Anti Shoot-Through Current Limit Comparator SW Softstart Limit High Side VIN GND PMOS NMOS PG PG Comp V TH_UVLO VIN UVLO Comp Softstart Control Logic VOUT V OUT_SET Comparator Direct Control & Compensation Error amplifier Min. On Min. OFF VIN VOS Timer DCS Control Current Limit Comparator Limit Low Side Power Stage UVLO VOUT Vin-switch EN UVLO VIN_SW V Selection + Setting OUT V OUT_SET VSEL 1 VSEL 2 VSEL 3 VSEL 4 Ultra Low Power Reference 1.2V V TH_PG V OUT V Discharge OUT V REF UVLO EN EN EN_VIN_SW VIN TPS62745, TPS627451 SLVSC68A – JUNE 2015 – REVISED JUNE 2015 www.ti.com 8 Detailed Description 8.1 Overview The TPS62745 is the first dual-cell, ultra low power step down converter combining TI's DCS-Control™ topology and ultra low quiescent current consumption (400 nA typical) while maintaining a regulated output voltage. The device extends high efficiency operation to output currents down to a few micro amperes. 8.2 Functional Block Diagram 8.3 Feature Description 8.3.1 DCS-Control™ TI's DCS-Control™ (Direct Control with Seamless Transition into Power Save Mode) is an advanced regulation topology, which combines the advantages of hysteretic and voltage mode control. Characteristics of DCS - ControlTM are excellent AC load regulation and transient response, low output ripple voltage and a seamless transition between pulse frequency modulation (PFM) and pulse width modulation (PWM) mode operation. DCS- ControlTM includes an AC loop which senses the output voltage (VOUT pin) and directly feeds the information to a fast comparator stage. This comparator sets the switching frequency, which is constant for steady state operating conditions, and provides immediate response to dynamic load changes. In order to achieve accurate DC load regulation, a voltage feedback loop is used. The internally compensated regulation network achieves fast and stable operation with small external components and low ESR capacitors. The DCS-ControlTM topology supports PWM mode for medium and high load conditions and a power save mode at light loads. During PWM mode, it operates in continuous conduction. The switching frequency is up to 2.5 MHz with a controlled frequency variation depending on the input voltage. If the load current decreases, the converter seamlessly enters power save mode to maintain high efficiency down to very light loads. In power save mode the switching frequency varies linearly with the load current. Since DCS-ControlTM supports both operation modes within one single building block, the transition from PWM to power save mode is seamless without effects on the output voltage. The TPS62745 offers both excellent DC voltage and superior load transient regulation, combined with very low 10 Submit Documentation Feedback Copyright © 2015, Texas Instruments Incorporated Product Folder Links: TPS62745 TPS627451 |
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