BD91361MUV_12 Datasheet, PDF (12/23 Pages) Rohm – 2.7V to 5.5V, 4A 1ch Synchronous Buck Converter Integrated FET

BD91361MUV
Datasheet
●Information on Advantages
Advantage 1 : Offers fast transient response with current mode control system.
Conventional product (Load response IO=1A→3A)
BD91361MUV (Load response IO=1A→3A)
VOUT
145mV
VOUT
62mV
IOUT
IOUT
Voltage drop due to sudden change in load was reduced by about 50%.
Fig.27 Comparison of transient response
Advantage 2 : Offers high efficiency for all load range.
・For lighter load:
Utilizes the current mode control mode called SLLM for lighter load, which reduces various dissipation such as
switching dissipation (PSW), gate charge/discharge dissipation, ESR dissipation of output capacitor (PESR) and
on-resistance dissipation (PRON) that may otherwise cause degradation in efficiency for lighter load.
・For heavier load:
Achieves efficiency improvement for lighter load.
Utilizes the synchronous rectifying mode and the low on-resistance MOS FETs incorporated as power transistor.
ON resistance of High side MOS FET : 60mΩ(Typ.)
ON resistance of Low side MOS FET : 55mΩ(Typ.)
Achieves efficiency improvement for heavier load.
Offers high efficiency for all load range with the improvements mentioned above.
100
SLLM^TM
②
50 _{① PWM}
①inprovement by SLLM system
②improvement by synchronous rectifier
0
0.001 0.01
0.1
1
Output current Io[A]
Fig.28 Efficiency
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02.MAR.2012 Rev.001