Datasheet

VIN
OFF ON
ON
OFF
VOUT
C
F
C
OUT
+
-
2.5V
Q1
Q2
Q3
Q4
VIN
OFF
ON
ON
OFF
VOUT
C
F
C
OUT
+
-
2.5V
VQ1
Q1
Q2
Q3
Q4
TPS60151
SLVSA02 – SEPTEMBER 2009 ......................................................................................................................................................................................... www.ti.com
Figure 22. Charging Mode
During the first half cycle, Q2 and Q3 transistors are turned on and flying capacitor, C
F
, will be charged to 2.5V
ideally.
Figure 23. Discharging Mode
During the second half cycle, Q1 and Q4 transistors are turned on. Capacitor C
F
will then be discharged to
output.
The output voltage can be calculated as follows:
Vout = V
IN
- VQ1 + V(C
F
) - VQ4 = VIN - VQ1 + 2.5V - VQ4 = 5 V. (Ideal)
The output voltage is regulated by output feedback and an internally compensated voltage control loop.
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