| 摘要 |
PROBLEM TO BE SOLVED: To improve the power efficiency of a switching regulator.SOLUTION: A switching regulator controls a first output transistor QH supplying a current to an inductor LOUT and generates a second power-supply voltage VOUT from a first power-supply voltage VIN. The switching regulator includes: an error amplifier 10 amplifying a difference between the second power-supply voltage VOUT and a reference voltage VREF; a current sense amplifier 12 converting an inductor current IL into a voltage; a current comparator 14 comparing an output voltage of the error amplifier 10 with an output voltage of the current sense amplifier 12 and outputting a trigger signal; a pulse generating circuit 16 generating a control pulse in response to the trigger signal; and a sleep control circuit controlling an operation of the current sense amplifier 12 or the pulse generating circuit 16 by a sleep signal supplied from a load side. In a sleep period, the pulse generating circuit 16 generates the control pulse after predetermined time elapses from the generation of the trigger signal. |
