Datasheet

NORMAL MODE AND SKIP MODE OPERATION
t
t
t
t
V
OUT
GateWaveform
OfQ1 Transistor
Loadcurrent
Noload
Startup
Waveform
SkipModeat
NoLoadCondition
NormalModeat
50 mA LoadCurrent
SkipModeat
NoLoadCondition
QuiescentCurrent
90 Am
4.7mA
50mA
5V+0.1V
5V
TPS60151
www.ti.com ......................................................................................................................................................................................... SLVSA02 – SEPTEMBER 2009
Figure 24. Normal Mode and Skip Mode Operation
The TPS60151 has skip mode operation as shown in Figure 24 . The TPS60151 enters skip mode if the output
voltage reaches 5V+0.1V and the load current is below 8mA (typ). In Skip Mode, the TPS60151 disables the
oscillator and decreases the pre-bias current of the output stage to reduce the power consumption. Once the
output voltage dips below threshold voltage, 5V+0.1V, the TPS60151 begins switching to increase output voltage
until the output reaches 5V+0.1V. When the output voltage dips below 5V, the TPS60151 returns to normal PWM
mode; thereby re-enabling the oscillator and increasing the pre_bias current of the output stage to supply output
current.
The skip threshold voltage and current depend on input voltage and output current conditions.
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