BD9528MUV ROHM [Rohm], BD9528MUV Datasheet - Page 16

• Manufacturer Part Number: BD9528MUV
• Description: Main Power Supply ICs for Note PC(Linear Regulator Integrated)
• Manufacturer: ROHM [Rohm]

Notes when waking up with CTL pin or VIN pin
(REF start-up time＜SS start-up time)
(REF start-up time＞SS start-up time)
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BD9528MUV
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If EN pin is High or short (or pull up resistor) to REG1 pin, IC starts up by switching CTL pin, the IC might fail to start up (SCP
function) with the reason below, please be careful of SS pin and REF pin capacitor capacity.
REG1, REG2
SCP_REF
(VIN)
REF
REF
CTL
REF
CTL
BG
SS
SS
FB
FB
SS
VIN
REG1 REG2
reference
circuit
Inner
REG1 UVLO cancellation
SCP mask
SCP function is masked until SS pin reaches
cramp voltage (2.5V).
BG
SCP mask cancellation
SCP_REF
SCP function masked
16/33
FB
SCP circuit
SCP
SCP mask cancellation
1ms(typ.)
Delay
PWM
(Switching control signal)
REG1
REG2
0.49V(typ)
SS
FB
SCP
FB starts up as SS reference
FB starts up as REF reference
After the end of SS wake-up,
within SCP delay time (1ms), if
REF voltage does not reach
SCP_REF(0.49V), SCP turns
ON and shut down.
Technical Note
2010.03 - Rev.A