Technical Note
 
9/18 
www.rohm.com
2009.08 - Rev.A
?2009 ROHM Co., Ltd. All rights reserved.
BD9153MUV 
?SPAN class="pst BD9153MUV-E2_2471427_7">Description of operations 
鸖oft-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.
 
鸖hutdown 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 0礎 (Typ.).
 
 
鸕ST function
If DET voltage over 0.72V(Typ.), RST terminal shifted to High after 50ms(Typ.) delay. And the hysteresis width of 24mV
(Typ.) is provided to prevent output chattering.
 
鸘VLO function
Detects whether the input voltage sufficient to secure the output voltage of BU9153MUV is supplied. And the hysteresis
width of 100mV (UVLO1 Typ.) ,50mV(UVLO2 Typ.) is provided to prevent output chattering. Each the outputs have UVLO.
It is possible to set output sequence easy.
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Fig.32 Soft-start, Shutdown, RST Delay, UVLO, timing chart
 
 
 
 
 
 
 
 
 
VCCEN 
 
Output
 
 
RST  
 
 
  
 
 
  4.5V detect (RST Release voltage ?.25)
  3.9V detect (UVLO Release voltage 1)
 
2.55V detect (UVLO Release voltage2)
3.3V Output (DC/DC 1)
2.5V Output (LDO)
1.2V Output (DC/DC 2)
 
 
 
RST 
  4.35V (RST Threshold Voltage ?.25)
 
  3.8V (UVLO Threshold Voltage 1)
 
 2.5V (UVLO Threshold Voltage 2)
 
0.8ms Soft-start
50ms
(RST Delay)
Natural discharge
 
 
 
VS discharge ON 
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