BD9535MUV-E2 ROHM

High Performance Regulators for PCs Switching Regulator for DDR-SDRAM Cores No.10030EBT34 BD9535MUV Description BD9535MUV is a 2ch switching regulator controller with high output current which can achieve low output voltage (0.7V 2.0V) from a wide input voltage range (4.5V25V). 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 TM 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 the soft start/stop function, variable frequency function, short circuit protection function with timer latch, and tracking function are all built in. This 2ch switching regulator is specially designed for Chipset and Front Side Bus. Features 3 TM 1) 2ch H REG Switching Regulator Controller 2) Light Load Mode and Continuous Mode Changeable 3) Thermal Shut Down (TSD), Under Voltage LockOut (UVLO), Over Current (detect the peak current) Protection (OCP), Over Voltage Protection (OVP), Short circuit protection with built-in timer-latch 4) Soft start function to minimize rush current during startup 5) Switching Frequency Variable (f=200KHz600kHz) 6) VQFN032V5050 package 7) Built-in Power good circuit 8) Adjustable to chip set spec by tracking function Applications Laptop PC, Desktop PC, LCD-TV, Digital Components www.rohm.com 2010.07 - Rev.B 1/21 2010 ROHM Co., Ltd. All rights reserved. Technical Note BD9535MUV Maximum Absolute Ratings (Ta=25) Parameter Symbol Ratings Unit *1 Input Voltage 1 V 7 V CC *1 Input Voltage 2 V 7 V DD *1 Input Voltage 3 V 30 V IN *1 BOOT Voltage V 35 V BOOT1/2 *1 BOOT-SW Voltage V -V , V -V 7 V BOOT1 SW1 BOOT2 SW2 *1 HG-SW Voltage V -V , V -V 7 V HG1 SW1 HG2 SW2 LG Voltage V V V LG1/2 DD Setting for Output Voltage V V V REF1/2 CC Output voltage V , V V V Is+1/2 Is-1/2 CC SS Voltage V V V SS1/2 CC FS Voltage V V V FS CC VREG voltage V V V REG CC Current Limit setting Voltage V V V ILIM1/2 CC *1 Logic Input Voltage V 7 V EN1/2 *1 PGOOD Voltage V 7 V PGOOD1/2 *1 CE Voltage V 7 V CE1/2 Power dissipation Pd T.B.D W Operating Temperature Range Topr -10+100 Storage Temperature Range Tstg -55+150 Junction Temperature Tjmax +150 *1 Not to exceed Pd. Operating Conditions (Ta=25) Ratings Parameter Symbol Unit Min. Max. Input Voltage 1 V 4.5 5.5 V CC Input Voltage 2 V 4.5 5.5 V DD Input Voltage 3 V 3.0 28 V IN BOOT Voltage V 4.5 30 V BOOT1/2 SW Voltage V -2 33 V SW1/2 BOOT-SW Voltage V -V , V -V 4.5 5.5 V HG1 SW1 HG2 SW2 Logic Input Voltage V 0 5.5 V EN1/2 Setting Voltage for Output Voltage V 0.7 2.0 V REF1/2 Is Input Voltage V , V 0.7 2.0 V Is+1/2 Is-1/2 MIN ON time tonmin - 100 nsec This product should not be used in a radioactive environment. www.rohm.com 2010.07 - Rev.B 2/21 2010 ROHM Co., Ltd. All rights reserved.