参数资料
| 型号： | BD9139MUV-E2 |
| 厂商： | Rohm Semiconductor |
| 文件页数： | 9/22页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC ADJ 3A 16VQFN |
| 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： | 3A |
| 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： | 16-VFQFN 裸露焊盘 |
| 包装： | 标准包装 |
| 供应商设备封装： | 16-VQFN（3x3） |
| 其它名称： | BD9139MUV-E2DKR |
BD9139MUV
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.
50mV (Typ.) is provided to prevent output chattering.
Hysteresis 50mV
V CC
EN
V OUT
And the hysteresis width of
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
? 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(T LATCH ) or more.
UVLO.
EN
The output thus held tuned OFF may be recovered by restarting EN or by re-unlocking
1msec
V OUT
Output Current in non-control
1/2V OUT
Until output voltage goes up the half of Vo or over,
timer latch is not operated.
(No timer latch, only limit to the output current)
Limit
I L
Output voltage OFF Latch
Output Current in control by limit value
(With fall of the output voltage, limit value goes down)
Standby mode
EN
Operated mode
Standby mode
Timer Latch
EN
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
9/20
TSZ02201-0J3J0AJ00170-1-2
02.MAR.2012 Rev.001
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