BD8966FVM Datasheet, PDF (5/15 Pages) Rohm – Low Noise High Efficiency Step-down Switching Regulator with Built-in Power MOSFET

BD8966FVM
Technical Note
●Information on advantages
Advantage 1：Offers fast transient response with current mode control system.
Conventional product (Load response IO=0.1A→0.6A)
BD8966FVM (Load response IO=0.1A→0.6A)
VOUT
110mV
VOUT
90mV
IOUT
IOUT
Voltage drop due to sudden change in load was reduced .
Fig.17 Comparison of transient response
Advantage 2： Offers high efficiency with synchronous rectifier
・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 : 350mΩ(Typ.)
ON resistance of N-channel MOS FET : 250mΩ(Typ.)
100
90 ^{【VOUT=1.5V】}
80
70
60
50
40
30
VCC=5V
20
Ta=25℃
10
0
1
10
100
1000 10000
OUTPUT CURRENT:IOUT[mA]
Advantage 3：・Supplied in smaller package due to small-sized power MOS FET incorporated.
Fig.18
・Output capacitor Co required for current mode control:10μF ceramic capacitor
・Inductance L required for the operating frequency of 1 MHz: 4.7μH inductor
Reduces a mounting area required.
VCC
DC/DC
Convertor
Controller
RITH
CITH
Cin
L
VOUT
Co
15mm
CIN
RITH
L
10mm
CITH
CO
Fig.19 Example application
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5/14
2009.05 - Rev.A