Featured Products Compact design saves valuable board space Dual-Output Step-Down Converter BD93291EFJ Dual-output DC/DC converter with built-in MOSFET 電源 DEGITAL CATV The BD93291EFJ integrates 2 synchronous rectification buck DC/DC converters in a compact 8-pin package for increased space savings. In addition, high efficiency operation is ensured throughout the entire load range, setting new standards for power consumption. Space-saving Dual-output design in a single-output form factor 3 Power Conversion Efficiency Parameter High Voltage (VOUT1) Low Voltage (VOUT2) Input Voltage Range 8.0V to 26V Output Voltage Range 5.0V±1.5% 0.8V to 4.0V - 0.8V±1.5% 2.5A 1.5A 300kHz to 600kHz 1.5MHz to 2.5MHz Output Current Switching Frequency MOSFET ON Resistance 175mΩ / 175mΩ (typ.) (High Side) (Low Side) Operating Temp. Range 5.0V (V 1 output voltage used) OUT • Overcurrent protection (OCP) • Undervoltage lock out (UVLO) 3 H Reg adjusts the ON time of the High Side voltage recovery faster output during output 10 100 1000 TM 70 50 Improved voltage drops due to sudden load changes. High-speed load response Conventional Product (No Light Load Mode) 10 100 IOUT2 [mA] High efficiency across the entire load range Conditions: VIN=5.0V VOUT=3.3V L=2.2μH 1000 10000 Applications Chipset operating voltage range Improved BD93291EFJ (With Light Load Mode) 80 60 Control Output Voltage Conventional 10000 Low Voltage Step-Down DC/DC (VOUT2) 100 0A BD93291EFJ FET, improving transient response Conditions: VIN=12V VOUT=5.0V L=22μH IOUT1 [mA] 2.5A Output Current Conventional Product (No Light Load Mode) 90 for stable output voltage. This method for 70 50 • Thermal shutdown (TSD) The BD93291EFJ utilizes ROHM’s characteristics 80 250mΩ, 250mΩ (typ.) H 3RegTM Control provides high-speed load response H3RegTM control High efficiency across the entire load range 60 (High Side) (Low Side) Soft start function proprietary BD93291EFJ (With Light Load Mode) 90 -40°C to +85°C Multiple protection circuits High Voltage Step-Down DC/DC (VOUT1) 100 Efficiency [%] Reference Voltage ■ High power conversion efficiency across the entire load range TM Specifications ■ Energy efficient H Reg ON time control ensures stable output voltage Efficiency [%] HTSOP-J8 High-speed load response Time ■ PC monitors, LCD TVs ■ Set-top boxes ■ DVD/Blu-ray players and recorders ■ Secondary, POL power supplies ■ Broadband communication Application Circuits Conventional BD93291EFJ (1ch +1ch) DC/DC + LDO ICs (2ch) Dual DC/DC IC (2-in-1) DC/DC 19V→5V 19V→5V C4 Enable COMP FB BST VIN SW GND VOUT1 C1 C2 L1 H3RegTM VOUT 4 VOUT1 C3 1 SWL 3 2 FBL 2 Space saving design 3 GND 1 L1 SW R1 4 BST 5 EN 6 C2 C1 VIN 7 EN R2 8 VIN Enable VIN R3 SS C5 5 6 7 8 C3 C6 L2 High-speed load response C4 VOUT2 R1 R2 C5 LDO VOUT VIN C6 VOUT2 5.0V→3.3V C7 GND Switching efficiency Increased 28% 5.0V→3.3V LDO (19V→3.3V) Large heat loss DC/DC Converter Lineup Evaluation Board Switching Regulators Built-in FET (Converters) Single Output Buck Type Boost Type Boost-Buck Type Dual Output External FET (Controllers) Single Output Buck Type Boost/Neg. V. Type Buck Type Boost Type Boost/Neg. V. Type Dual Output Buck Type Boost/Neg. V./Buck Type The content specified in this document is correct as of October 1st, 2013. [O_023] Catalog No.56O6735E 10.2013 ROHM © 3')