NJU7631

NJU7631 Step-Down Switching Regulator IC with Power Saving PWM/PFM control ■ GENERAL DESCRIPTION The NJU7631 is a low voltage operation high-speed switching regulator control IC for step-down converter, with PWM/PFM switching control. It can improve a switching efficiency on light load with automatically changing between PWM and PFM controls. It incorporates a totem pole output, which can drive an external MOS-FET easily. The NJU7631 also has a soft-start function, dead time control and timer latch for short circuit protection and their times are all adjustable with external parts. It is available in a small and thin 8-lead MSOP (TVSP) package. ■ PACKAGE OUTLINE NJU7631RB1 (MSOP8 (TVSP8)) ■ FEATURES ■ PRODUCT VARIATION ● Automatic PWM/PFM Control ● Operating Voltage 2.2V to 8V ● Wide Oscillator Range 300kHz to 1MHz NJU763x** Standby Function PWM/PFM ● Maximum Duty Cycle 100% ● Quiescent Current 800µA typ. ● Soft-Start Function Internal : 16ms typ. or adjustable ● Dead Time Control ● Timer Latch for Short Circuit Protection ● C-MOS Technology ● Package Outline NJU7631RB1 : MSOP8 (TVSP8)* NJU7631 PWM/PFM Light Load to Efficiency NJU7630 PWM Control ** Planning *MEET JEDEC MO-187-DA / THIN TYPE ■ PIN CONFIGURATION 1 2 3 4 NJU7631RB1 8 7 6 5 PIN FUNCTION 1. OUT 2. V+ 3. FB 4. IN 5. SCP 6. DTC 7. RT 8. GND Ver.2012-08-03 -1- NJU7631 ■ BLOCK DIAGRAM FB IN1V Vref V+ ER⋅AMP Soft Start Latch UVLO SCP 1V 2µA SCP 2kΩ 1V 0.5 RT A DTC OSC 0.5V RT ...