BD9528MUV ROHM [Rohm], BD9528MUV Datasheet - Page 17

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

●Output Discharge
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BD9528MUV
www.rohm.com
VIN, CTL
REG1
VIN,CTL
VOUT
VOUT
EN
UVLO ON
Output Discharge
The efficiency of
VIN voltage drop
Output Hi-Z
It will be available to use if connecting VOUT pin to DC/DC output.
(Total about 100Ω) . Discharge function operates when ①EN=’L’
②UVLO=ON(If input voltage is low) ③SCP Latch time ④TSD=ON.
The function at output discharge time is shown as left.
(1)during EN=’H’→‘L’
(2) during VIIN=CTL=H→0V
① IC is in normal operation until REG1 voltage becomes lower than
② If REG1 voltage reaches the UVLO voltage, output discharge
③ In addition, if REG1 voltage drops, inner IC logic cannot operate, so
If EN pin voltage is below than EN threshold voltage, output
discharge function is operated, and discharge output capacitor
charge.
UVLO voltage. However, because VIN voltage also becomes low,
output voltage will drop, too.
function is operated, and discharge output capacitor charge.
that output discharge function does not work, and becomes output
Hi-z. （In case, FB has resistor against GND, discharge at the
resistor.）
17/33
Technical Note
2010.03 - Rev.A