VIN

OFF

ON

ON

OFF

VOUT

CF

COUT

+

-

2.5V

VQ1

Q1

Q2

Q3

Q4

VIN

OFF

ON

ON

OFF

VOUT

CF

COUT

+

-

2.5V

Q1

Q2

Q3

Q4

7

TPS60151

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SLVSA02B – SEPTEMBER 2009 – REVISED JANUARY 2019

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8 Detailed Description

8.1 Overview

The TPS60151, regulated charge pump, provides a regulated output voltage for various input voltages. The

TPS60151 regulates the voltage across the flying capacitor to 2.5 V and controls the voltage drop of Q1 and Q2

while a conversion clock with 50% duty cycle drives the FETs.

Figure 3. Charging Mode

During the first half cycle, Q2 and Q3 transistors are turned on and flying capacitor, CF, will be charged to 2.5 V

ideally.

Figure 4. Discharging Mode

During the second half cycle, Q1 and Q4 transistors are turned on. Capacitor CF will then be discharged to

output.

The output voltage can be calculated as follows:

Vout = VIN – VQ1 + V(CF) - VQ4 = VIN – VQ1 + 2.5 V - VQ4 = 5 V. (Ideal)

(1)

The output voltage is regulated by output feedback and an internally compensated voltage control loop.