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REG71050DRVT Datasheet(PDF) 7 Page - Texas Instruments |
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REG71050DRVT Datasheet(HTML) 7 Page - Texas Instruments |
7 / 32 page Step-Up(Boost)Mode (A) (B) OFF ON ON OFF C PUMP Q 2 Q 4 C OUT V OUT C PUMP Q 2 Q 4 C OUT V OUT OFF ON Q 1 Q 3 ON OFF Q 1 Q 3 C IN V IN C IN V IN OFF SWITCHED Step-Down(Buck)Mode OFF ON C PUMP Q 1 Q 3 Q 2 Q 4 C IN C OUT V OUT V IN REG71050, REG71055, REG710 www.ti.com SBAS221H – DECEMBER 2001 – REVISED OCTOBER 2015 8 Detailed Description 8.1 Overview The REG710 regulated charge pump provides a regulated output voltage for input voltages which are not regulated with a value that can be lower or higher than the regulated output voltage. This is accomplished by automatic mode switching within the device. When the input voltage is greater than the required output, the device operates as a variable frequency switched-mode regulator. This operation is shown in Figure 5. Transistors Q1 and Q3 are held off, Q4 is on, and Q2 is switched as needed to maintain a regulated output voltage. When the input voltage is less than the required output voltage, the device switches to a step-up or boost mode of operation, as shown in Figure 6. A conversion clock of 50% duty cycle is generated. During the first half cycle the FET switches are configured as shown in Figure 6 (A), and CPUMP charges to VIN. During the second half cycle the FET switches are configured as shown in Figure 6 (B), and the voltage on CPUMP is added to VIN. The output voltage is regulated by skipping clock cycles as necessary. Figure 5. Simplified Schematic of the REG710 Operating in the Step-Down Mode Figure 6. Simplified Schematic of the REG710 Operating in the Step-Up or Boost Mode Copyright © 2001–2015, Texas Instruments Incorporated Submit Documentation Feedback 7 Product Folder Links: REG71050 REG71055 REG710 |
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