NJU7640

NJU7640 Step-Down switching regulator IC with Over Current Protection ■ GENERAL DESCRIPTION The NJU7640 is a low voltage operation high-speed switching regulator control IC for step-down converter, with a pulse-by-pulse over-current protection. The pulse-by-pulse over-current protection circuit can limit the over current in switching operation. It incorporates a totem pole output, which can drive an external MOS-FET easily. It also has a soft-start function and dead time control and their times are all adjustable with external parts. The NJU7640 is available in a small and thin 8-lead MSOP (TVSP) package. ■ FEATURES ● PWM switching control ● Pulse-by-pulse over current protection ● Operating Voltage 2.2V to 8V ● Wide Oscillator Range 300kHz to 1MHz ● Maximum Duty Cycle 100% ● Quiescent Current 800µA typ. ● Soft-Start Function Internal : 16ms typ. or adjustable ● Dead Time Control ● C-MOS Technology ● Package Outline NJU7640RB1 : MSOP8 (TVSP8)* *MEET JEDEC MO-187-DA / THIN TYPE ■ PACKAGE OUTLINE NJU7640RB1 (MSOP8 (TVSP8)) ■ PRODUCT VARIATION NJU7650 Constant Current Control NJU7640 Over Current Protection NJU7630 PWM Control ■ PIN CONFIGURATION 1 2 3 4 NJU7640RB1 8 7 6 5 PIN FUNCTION 1. OUT 2. V+ 3. FB 4. IN5. SENSE 6. DTC 7. RT 8. GND Ver.2012-08-03 -1- NJU7640 ■ BLOCK DIAGRAM V+ FB IN- 1V Vref ER⋅AMP UVLO Soft Start SENSE V+ 0.2V Blanking OUT OCP 0.5 RT A OSC 0.5V 0.8V 0.2V PW M Buffer OUT DTC RT RT GND -2- Ver.2012-08-03 NJU76...