TECHNICAL NOTE
High-performance Regulator IC Series for PCs
Switching Regulators
for DDR-SDRAM Cores
BD9532EKN
●Description
BD9532EKN 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 25V). High efficiency for the switching regulator can be realized by utilizing an
external N-MOSFET power transistor. A new technology called H
3
Reg
TM
is a Rohm proprietary control method to realize ultra
high transient response against load change. SLLM
TM
(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, and REF synchronous function are all
built in. This switching regulator is specially designed for the DDR-SDRAM core.
●Features
1) H
3
Reg
TM
Switching Regulator Controller
2) Light Load Mode and Continuous Mode Changeable
3) Thermal Shut Down (TSD), Under Voltage LockOut (UVLO), Over Current Protection (OCP),
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
