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REG71050DRVT Datasheet(PDF) 7 Page - Texas Instruments

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Part # REG71050DRVT
Description  Buck-Boost Charge Pump
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

REG71050DRVT Datasheet(HTML) 7 Page - Texas Instruments

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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
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Product Folder Links: REG71050 REG71055 REG710


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