参数资料
| 型号： | BD9137MUV-E2 |
| 厂商： | Rohm Semiconductor |
| 文件页数： | 9/21页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC ADJ 4A 20VQFN |
| 标准包装： | 1 |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 0.8 V ~ 3.3 V |
| 输入电压： | 2.7 V ~ 5.5 V |
| PWM 型： | 电流模式 |
| 频率 - 开关： | 1MHz |
| 电流 - 输出： | 4A |
| 同步整流器： | 是 |
| 工作温度： | -40°C ~ 105°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 20-VFQFN 裸露焊盘 |
| 包装： | 标准包装 |
| 供应商设备封装： | 20-VQFN |
| 其它名称： | BD9137MUV-E2DKR |
BD9137MUV
Datasheet
● Description of Operations
? Soft-start function
EN terminal shifted to “High” activates a soft-starter to gradually establish the output voltage with the current limited during
startup, by which it is possible to prevent an overshoot of output voltage and an inrush current.
? Shutdown function
With EN terminal shifted to “Low”, the device turns to Standby Mode, and all the function blocks including reference
voltage circuit, internal oscillator and drivers are turned to OFF. Circuit current during standby is 0μF (Typ.).
? UVLO function
Detects whether the input voltage sufficient to secure the output voltage of this IC is supplied. And the hysteresis width of
50mV (Typ.) is provided to prevent output chattering.
Hysteresis 50mV
V CC
EN
V OUT
Tss
Soft start
Tss
Tss
Standby mode
Operating mode
Standby
mode
Operating mode
Standby
mode
Operating mode
Standby mode
UVLO
UVLO
EN
UVLO
Fig.22 Soft start, Shutdown, UVLO timing chart
? Switching of SLLM function PWM fixed function
This IC operates SLLM control at light load, but this control can be deleted by activating EN when impressing more than
2.0V to PWM terminal making PWM control to be done also at light load. Always operating at fixed frequency can reduce
Output voltage ripple.
? Short-current protection circuit with time delay function
Turns OFF the output to protect the IC from breakdown when the incorporated current limiter is activated continuously for
the fixed time(Hiccup delay) or more. The IC returns to normal operation after Cool down time period has elapsed
(self-returning type).
EN
Hiccup delay
1msec
V OUT
Output Current in non-control
1/2V OUT
Cool down
time
16msec
Limit
I L
Output voltage OFF
Output Current in control by limit value
(With fall of the output voltage, limit value goes down)
Standby mode
EN
Operated mode
Cool down
Output voltage OFF
Operated mode
Fig.23 Short-current protection circuit with time delay timing chart
www.rohm.com
?2012 ROHM Co., Ltd. All rights reserved.
TSZ22111 ? 15 ? 001
9/19
TSZ02201-0J3J0AJ00160-1-2
02.MAR.2012 Rev.001
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