TECHNICAL NOTE High-performance Regulator IC Series for PCs Switching Regulators for DDR-SDRAM Cores BD9533EKN Description BD9533EKN is a switching regulator controller with high output current which can achieve low output voltage (0.7V to 2.0V) from a wide input voltage range (4.5V to 28V). High efficiency for the switching regulator can be realized by utilizing an 3 TM external N-MOSFET power transistor. A new technology called H Reg is a Rohm proprietary control method to realize ultra high transient response against load change. SLLM (Simple Light Load Mode) technology is also integrated to improve efficiency in light load mode, providing high efficiency over a wide load range. For protection and ease of use, the soft start function, variable frequency function, short circuit protection function with timer latch, over voltage protection function and REF synchronous function are all built in. This switching regulator is specially designed for the DDR-SDRAM core. Features 3 TM 1) H Reg Switching Regulator Controller 2) Light Load Mode and Continuous Mode Changeable 3) Thermal Shut Down (TSD), Under Voltage LockOut (UVLO), Over Current Protection (OCP), Over Voltage Protection (OVP), Short Circuit Protection (SCP) built-in 4) Soft start function to minimize rush current during startup 5) Switching Frequency Variable (f=200KHz 600KHz) 6) HQFN20V Package Applications Laptop PC, Desktop PC, LCD-TV, Digital Components Sep. 2008 Maximum Absolute Ratings (Ta=25) Parameter Symbol LimitUnit *1 Input Voltage 1 VCC 7 V *1 Input Voltage 2 VDD 7 V *1 Input Voltage 3 VIN 30 V *1 BOOT Voltage BOOT 35 V *1 BOOT-SW Voltage BOOT-SW 7 V *1 HG-SW Voltage HG-SW 7 V LG Voltage LG VDD V REF Voltage REF VCC V Output Voltage VOUT/Is+/Is- VCC V ILIM/SCP/SS/FS/SLLM Voltage ILIM/SCP/SS/FS/SLLM VCC V VREG Voltage VREG VCC V *1 EN Input Voltage EN 7 V *2 Power Dissipation 1 Pd1 0.5 W *3 Power Dissipation 2 Pd2 0.75 W *4 Power Dissipation 3 Pd3 1.75 W *5 Power Dissipation 4 Pd4 2.00 W Operating Temperature Range Topr -10+100 Storage Temperature Range Tstg -55+150 Maximum Junction Temperature Tjmax +150 *1 Not to exceed Pd. *2 Reduced by 4mW for each increase in Ta of 1 over 25 (when dont mounted on a heat radiation board ) *3 Reduced by 6mW for increase in Ta of 1 over 25. (when mounted on a board 70.0mm70mm1.6mm Glass-epoxy PCB.) *4 Reduced by 14mW for increase in Ta of 1 over 25. (when mounted on a board 70.0mm70mm1.6mm Glass-epoxy PCB.) *5 Reduced by 16mW for increase in Ta of 1 over 25. (when mounted on a board 70.0mm70mm1.6mm Glass-epoxy PCB.) Operating Conditions (Ta=25) Parameter Symbol MINMAXUnit Input Voltage 1 VCC 4.5 5.5 V Input Voltage 2 VDD 4.5 5.5 V Input Voltage 3 VIN 4.5 28 V BOOT Voltage BOOT 4.5 33 V SW Voltage SW -0.7 28 V BOOT-SW Voltage BOOT-SW 4.5 5.5 V SLLM Input Voltage SLLM 0 5.5 V EN Input Voltage EN 0 5.5 V Output setting voltage REF 0.7 2.0 V Is Input Voltage Is+/Is- 0.7 2.7 V MIN ON Time Tonmin - 200 nsec This product should not be used in a radioactive environment. 2/20