BD9161FVM_12 Datasheet, PDF (10/19 Pages) Rohm – 2.5V to 4.5V, 0.6A 1ch Synchronous Buck Converter Integrated FET

BD9161FVM
Datasheet
Information on Advantages
Advantage 1：Offers fast transient response with current mode control system.
Conventional product (VOUT of which is 2.5 volts)
BD9161FVM (Load response IO=250mA→500mA)
VOUT
98mV
VOUT
40mV
IOUT
IOUT
Voltage drop due to sudden change in load was reduced by about 50%.
Fig.24 Comparison of transient response
Advantage 2： Offers high efficiency for all load range.
・For lighter load:
Utilizes the current mode control mode called SLLM^TM 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.
Achieves efficiency improvement for lighter load.
・For heavier load:
Utilizes the synchronous rectifying mode and the low on-resistance
MOS FETs incorporated as power transistor.
ON resistance of P-channel MOS FET: 0.35 Ω (Typ.)
ON resistance of N-channel MOS FET: 0.37 Ω (Typ.)
100
SLLM^TM
②
50 _{① PWM}
①inprovement by SLLM^TM system
②improvement by synchronous rectifier
0
0.001 0.01
0.1
1
Output current Io[A]
Fig.25 Efficiency
Achieves efficiency improvement for heavier load.
Offers high efficiency for all load range with the improvements mentioned above.
Advantage 3： ・Supplied in smaller package due to small-sized power MOS FET incorporated.
・Allows reduction in size of application products
・Output capacitor Co required for current mode control: 10 μF ceramic capacitor
・Inductance L required for the operating frequency of 1 MHz: 4.7 μH inductor
Reduces a mounting area required.
VCC
RITH
CITH
DC/DC
Convertor
Controller
Cin
L
VOUT
Co
15mm
CIN
RITH
L
10mm
CITH
CO
Fig.26 Example application
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10/17
TSZ02201-0J3J0AJ00190-1-2
02.MAR.2012 Rev.001