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TPS62840DLC Datasheet(PDF) 11 Page - Texas Instruments |
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TPS62840DLC Datasheet(HTML) 11 Page - Texas Instruments |
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11 / 45 page  UVLO EN Gate Driver Anti Shoot-Through ILIM Comp. SW Limit High-Side VIN GND PMOS NMOS V TH_UVLO VIN UVLO Comparator Softstart VSW VOS Main Comparator Ramp Generator Error amplifier VIN VOS TON timer DCS Control Power Stage UVLO VOS VSET Ultra Low Power Reference V OUT Discharge UVLO EN V REF R2D converter Resistor to Digital Converter Limit Low-Side ILIM Comp. 450k Smart PD PD Control EN STOP 450k Smart PD PD Control STOP EN MODE Thermal Shutdown MODE MODE STOP VOS RPD RPD VREF + – 11 TPS62840 www.ti.com SLVSEC6D – JUNE 2019 – REVISED MARCH 2020 Product Folder Links: TPS62840 Submit Documentation Feedback Copyright © 2019–2020, Texas Instruments Incorporated 8 Detailed Description 8.1 Overview The TPS6284x is a synchronous step-down converter with ultra-low quiescent current consumption. Using TI's DCS-Control topology, the device extends the high efficiency operation area down to micro amperes of load current during Power-Save Mode Operation. Depending on the output voltage, the device consumes quiescent current from both the input and output to reduce the overall input current consumption to 60 nA typical. DCS-Control™ (Direct Control with Seamless Transition into Power-Save Mode) is an advanced regulation topology that combines the advantages of hysteretic and voltage mode controls. Characteristics of DCS-Control are excellent AC load regulation and transient response, low output ripple voltage, and a seamless transition between PFM and PWM modes. It includes a AC loop which senses the output voltage (VOS pin) and directly feeds this information into a fast comparator stage. The device operates with a nominal switching frequency of 1.8 MHz. An additional voltage feedback loop is used to achieve accurate DC load regulation. The internally compensated regulation network achieves fast and stable operation with small external components and low ESR capacitors. In Power-Save Mode, the switching frequency varies linearly with the load current. Since DCS-Control supports both operating modes, the transition from PWM to PFM is seamless with minimum output voltage ripple. The TPS6284x offers both, excellent DC voltage and superior load transient regulation, combined with low output voltage ripple thereby minimizing interferences with Radio Frequency circuits. 8.2 Functional Block Diagram |
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