Upcoming Product News Built-in ultra-high voltage power MOSFET 1ch Buck Switching Regulator BD9G341AEFJ 80V withstand voltage ideal for communication infrastructure applications Product Outline The BD9G341AEFJ 1ch buck switching regulator with built-in 80V-rated (76V input) power MOSFET provides sufficient margin for 48V bus lines used for communication infrastructure, making it easy to implement safer power supply designs for high voltage applications such as phone systems, routers, and base stations. HTSOP-J8 ( 4.9 x 6.0 x 1.0mm ) ■ 80V MOSFET ensures sufficient margin for 48V lines Features Application Circuit Example • Broad input voltage range: VCC=12V to 76V • Large output current: 3A (max.) (with built-in 80V / 3.5A / 150mΩ Nch MOSFET) 0.1μF VIN=48V • Output voltage range: VOUT=1.0V to Vcc VCC 10μF BST R1 • Variable frequency: 50kHz to 750kHz 33μH LX D1 EN • Reference voltage: 1.0V±1.5% (25°C) 3.0kΩ R2 • Standby mode 32°C 32°C 90 14 80 80 12 70 60 10 No element damage 40 8 20msec interval 20 6 LX pin voltage 4 0 2 Output current 0 0 5 10 15 20 25 30 35 40 45 50 Time (msec) Efficiency (%) 16 Output Current (A) LX Terminal Voltage (V) *highest efficiency in the 80V class 100 Chip surface temp: 32°C 100 10kΩ Efficiency is improved* across all load regions (by as much as 19%), leading to significantly increased energy savings. Short-Circuit Test BD9G341AEFJ BD9G341EFJ (VCC=76V) 120 6800pF ■ High efficiency, energy-saving design An integrated hiccup-mode overcurrent protection circuit prevents chip damage due to excessive heat generation. This provides greater safety and stability and eliminates the need for restart operation. VOUT-GND RT 47kΩ • Overcurrent protection (OCP), Undervoltage lockout (UVLO), Thermal shutdown (TSD), Overvoltage protection (OVP) ■ Safe, stable operation 0.75kΩ VC GND 100μF FB • High accuracy EN threshold: ±3% • Soft start function VOUT=5.0V / 3A VCC=48V Efficiency Comparison Measurement Conditions Measurement Conditions Oscillation Frequency : 300kHz (5V output) 1.5% BD9G341AEFJ 60 16.3% 50 40 19% 30 Conventional Conventional 20 10 0 1 *Hiccup mode: Automatically attempts to return to normal operation at regular intervals once IC operation is stopped due to overcurrent conditions 10 100 Output Current (mA) 26th October,2015. .57F6869E 10.2015 1000 *October 2015 ROHM study