NJU7691

NJU7691 300mA Synchronous Step-Down switching regulator IC ■ GENERAL DESCRIPTION The NJU7691 is a synchronous rectification switching regulator IC with a power MOSFET (300mA output). It incorporates an over-current detection and thermal shutdown circuit, which can make a power supply circuit with few external parts. The output voltage can be set from 1.8V. Therefore it is suitable for a power supply circuit for digital chips and logic ICs. The NJU7691 is available in a small and thin 8-lead MSOP (TVSP) package. ■ PACKAGE OUTLINE NJU7691RB1 (MSOP8 (TVSP8)) ■ FEATURES ● 300mA Synchronous Step-Down ● PWM switching control ● Operating Voltage 2.2V to 7V ● Wide Oscillator Range 300kHz to 1MHz ● Maximum Duty Cycle 100% ● Stand-by Current 5µA max. ● Soft-Start Function 4ms typ. ● Over Current Protection ● C-MOS Technology ● Package Outline NJU7691RB1 : MSOP8 (TVSP8)* *MEET JEDEC MO-187-DA / THIN TYPE ■ PIN CONFIGURATION 1 2 3 4 NJU7691RB1 8 7 6 5 PIN FUNCTION 1. SW 2. V+ 3. FB 4. IN5. ON/OFF 6. RT 7. AGND 8. PGND Ver.2012-08-03 -1- NJU7691 ■ BLOCK DIAGRAM V+ FB ER⋅AMP IN- 0.8V 0.2V OCP 0.8V Vref UVLO Standby ON/OFF Soft Start PWM Buffer OSC 0.5V TSD SW 100kΩ ON/OFF High: ON Low : OFF (Standby) RT RT AGND PGND -2- Ver.2012-08-03 NJU7691 ■ ABSOLUTE MAXIMUM RATINGS (Ta=25°C) PARAMETER Supply Voltage ON/OFF pin Voltage Power Dissipation Operating Temperature Range Storage Temperature Range SYMBOL V+ VON/OFF PD Topr Tstg MAXIMUM RATINGS +8 ...