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参数资料
| 型号： | BD9533EKN-E2 |
| 厂商： | Rohm Semiconductor |
| 文件页数： | 9/23页 |
| 文件大小： | 0K |
| 描述： | IC REG SW VAR SOFT START 20-HQFN |
| 标准包装： | 1 |
| 系列： | H³Reg™ |
| 应用： | 转换器，DDR SDRAM |
| 输入电压： | 4.5 V ~ 28 V |
| 输出数： | 1 |
| 输出电压： | 0.7 V ~ 2 V |
| 工作温度： | -10°C ~ 100°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 20-VFQFN 裸露焊盘 |
| 供应商设备封装： | 20-HQFN |
| 包装： | 标准包装 |
| 产品目录页面： | 1373 (CN2011-ZH PDF) |
| 其它名称： | BD9533EKN-E2DKR |
● Explanation of Operation
The BD9533EKN is a synchronous buck regulator controller incorporating ROHM’s proprietary H Reg
3 TM
CONTROLLA control
system. When V OUT drops due to a rapid load change, the system quickly restores V OUT by extending the T ON time interval.
Thus, it serves to improve the regulator ’s transient response. Activating the Light Load Mode will also exercise Simple Light
Load Mode (SLLM) control when the load is light, to further increase efficiency.
H Reg
3 TM
control
(Normal operation)
detected, activating the H Reg
CONTROLLA system.
V OUT
When V OUT falls to a threshold voltage (REF), the drop is
3 TM
REF
T ON =
REF
V IN
×
1
f
[sec] ??? (1)
HG
HG output is determined with the formula above.
LG outputs until the status of V OUT is lower than REF
after the status of HG is off.
LG
(V OUT drops due to a rapid load change)
V OUT
REF
When V OUT drops due to a rapid load change, and
the voltage remains below REF after the
programmed T ON time interval has elapsed, the
system quickly restores V OUT by extending the T ON
Io
HG
LG
(SLLM )
REF
HG
V OUT
T ON + α
time, improving the transient response.
In SLLM (SLLM=0V), SLLM function is operated when
LG pin is OFF and the coil current is lower than 0A
(the current goes from V OUT to SW). And it stops to
output next HG.
When V OUT goes lower than REF voltage again, the
status of HG is ON.
LG
0A
9/20
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