BD9104FVM-TR_09 データシートの表示（PDF） - ROHM Semiconductor
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BD9104FVM-TR_09
ROHM Semiconductor
BD9104FVM-TR_09 Datasheet PDF : 18 Pages
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BD9102FVM, BD9104FVM, BD9106FVM
Technical Note
●Information on advantages
Advantage 1：Offers fast transient response with current mode control system.
Conventional product (VOUT of which is 3.3 volts)
BD9104FVM(Load response IO=100mA→600mA)
VOUT
228mV
VOUT
110mV
IOUT
IOUT
Voltage drop due to sudden change in load was reduced by 50%.
Fig.41 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.
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: 0.25 Ω (Typ.)
100
SLLMTM
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.42 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 like MOSP8 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.43 Example application
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© 2009 ROHM Co., Ltd. All rights reserved.
8/17
2009.05 - Rev.A
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