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| BD9141MUV Datasheet, PDF (8/19 Pages) Rohm – Output 2A or More High-efficiency Step-down Switching Regulator with Built-in Power MOSFET | |||
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BD9141MUV
Technical Note
âDescription of operations
ã»Soft-start function
EN terminal shifted to âHighâ 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.
ã»Shutdown function
With EN terminal shifted to âLowâ, 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 0μA (Typ.).
ã»UVLO function
Detects whether the input voltage sufficient to secure the output voltage of this IC is supplied. And the hysteresis width of
100mV (Typ.) is provided to prevent output chattering.
Hysteresis 100mV
VCC
EN
VOUT
Standby mode
Tss
Soft start
Operating mode
UVLO
Tss
Tss
Standby
mode
Operating mode
Standby
mode
UVLO
EN
Operating mode
Standby mode
UVLO
Fig.24 Soft start, Shutdown, UVLO timing chart
www.rohm.com
© 2009 ROHM Co., Ltd. All rights reserved.
8/18
2009.06 - Rev.A
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