bd6538g ROHM Co. Ltd., bd6538g Datasheet - Page 8

• Manufacturer Part Number: bd6538g
• Description: Power Management Switch Ics
• Manufacturer: ROHM Co. Ltd.

●Operations Explanation
1.Overcurrent protection（OCD）
2. Thermal shutdown circuit（TSD）
3. Under voltage lockout （UVLO）
4. Overcurrent signal output
Overcurrent signal output （/OC）is N-MOS open drain output. At detection of overcurrent, thermal shutdown, output is Low
level.
UVLO keeps the switch-off state at MOSFET until VIN exceeds 2.3V (Typ.). If VIN drops under 2.2V (Typ.) while the
switch is turning on, then UVLO shuts off the power switch.
Under voltage lockout works when EN signal is enable.
The overcurrent detection circuit limits the current and outputs an error flag (/OC) when the current flowing in switch
MOSFET exceeds overcurrent threshold (I
The timer is reset when the state of the overcurrent is terminated before passing of T
is passed at blanking time, the switch is shut down and the overcurrent signal (/OC) changes to Low level.
The latch is reset through it input Low to EN or detects UVLO. Normal operation is returned by EN signal is set to High
or UVLO is off. (Fig. 4, Fig. 5).
The over current limit circuit works when EN signal is enable.
Thermal shutdown circuit turns off the switch and outputs an error flag (/OC) when the junction temperature exceeds
150°C (typ.). Therefore, when the junction temperature goes down to 150°C (typ), the switch output and an error flag
(/OC) are recovered automatically. This operating is repeated until cause of junction temperature increase is removed or
EN signal is set Disable. Thermal shutdown circuit works when EN signal is enable.
TH
).
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BLANK
. After a state of overcurrent