BU90002GWZ Datasheet, PDF (3/24 Pages) Rohm – Step-down Switching regulators with Built-in Power MOSFET

BU9000xGWZ series
Datasheet
●Description of operations
1) Shutdown
If the EN input pin set to low (<0.4V), all circuit are shut down and the regulator is standby mode. Do not leave the EN pin
floating.
2) Soft start function
The regulator has a soft start circuit that reduces in-rush current at start-up.Typical start up times with a 4.7uF output
capacitor is 120usec.
3) Current limit
The BU9000xGWZ has a current limit circuit that protects itself and external components during overload condition.
4) UVLO
The BU9000xGWZ has a Under Voltage Lock Out circuit that turn off device when VIN>2.05V(typ.)
5) FORCED PWM MODE
Setting MODE pin high (>1.4V) places the regulator in forced PWM.This control provides noise reduction and output
stability.Do not leave the MODE pin floating.
6) FORCED PFM MODE ( BU90005GWZ)
Setting MODE pin low (<0.4V) places the regulator in forced PFM. It is effective in light load mode.
7) TSD
The BU9000xGWZ has a thermal shutdown feature to protect the device if the junction temperature exceeds 150℃.
In thermal shutdown, the DRIVER is disabled.
This circuit is only to cut off the IC from thermal runaway, and has not been design to protect or guarantee the IC.
Therefore, the user should not plan to activate this circuit with continued operation in mind.
●Absolute Maximum Ratings (Ta=25℃)
Parameter
Symbol
Rating
Unit
Maximum input power supply voltage
VIN
7
V
Maximum voltage at EN, FB, LX, MODE
VEN, VFB,
VLX, VMODE
7
V
Power dissipation
Pd
0.39(*1)
W
Operating temperature range
Topr
-40 to +85
℃
Storage temperature range
Tstg
-55 to +125
℃
Junction temperature
Tjmax
+125
℃
(*1) When mounted on the specified PCB (55mm x 63mm), Deducted by 3.9m W/c when used over Ta=25c
●Recommended Operating Rating(s)
Parameter
Symbol
Input voltage
VIN
Rating
Unit
Min.
Typ.
Max.
Serise
4.0
-
2.3
-
5.5
BU90002GWZ
V
5.5
BU90003～BU90007GWZ
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TSZ22111・15・001
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TSZ02201-0F2F0AG00010-1-2
04.Jul.2012 Rev.001