TPS60150 Datasheet, PDF (11/20 Pages) Texas Instruments – TPS60150 5V/140mA Charge Pump Device

TPS60150
www.ti.com ........................................................................................................................................................................................... SLVS888 – DECEMBER 2008
NORMAL MODE AND SKIP MODE OPERATION
4.7 mA ^{Quiescent Current}
90 mA
t
50 mA ^{Load current}
No load
t
V_OUT
5 V +0.15 V
5V
t
Gate Waveform
Of Q1 Transistor
Start up
Waveform
t
Skip Mode at
Normal Mode at
Skip Mode at
No Load Condition 50 mA Load Current No Load Condition
Figure 24. Normal Mode and Skip Mode Operation
The TPS60150 has skip mode operation as shown in Figure 24. The TPS60150 enters skip mode if the output
voltage reaches 5V+0.15V and the load current is below 8mA(typ). In Skip Mode, the TPS60150 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+0.15V, the TPS60150 begins switching to increase output
voltage until the output reaches 5V+0.15V. When the output voltage dips below 5V, the TPS60150 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.
SHORT CIRCUIT PROTECTION
The TPS60150 has internal short circuit protection to protect the IC when the output is shorted to ground. To
avoid damage when output is shorted to ground, the short circuit protection circuitry senses output voltage and
clamps the maximum output current to 80mA(typ).
THERMAL SHUT DOWN PROTECTION
The regulator has thermal shutdown circuitry that protects it from damage caused by overload conditions. The
thermal protection circuitry disables the output when the junction temperature reached approximately 160°C,
allowing the device to cool. When the junction temperature cools to approximately 140°C, the output circuitry is
automatically re-enabled. Continuously running the regulator into thermal shutdown can degrade reliability. The
regulator also provides current limit to protect itself and the load.
Copyright © 2008, Texas Instruments Incorporated
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