BD9120HFN Rohm, BD9120HFN Datasheet - Page 30

• Manufacturer Part Number: BD9120HFN
• Description: (BD9106FVM - BD9120HFN) Synchronous Buck Converter Integrated FET
• Manufacturer: Rohm

BD9106FVM BD9107FVM BD9109FVM BD9110NV BD9120HFN
© 2012 ROHM Co., Ltd. All rights reserved.
TSZ22111･15･001
●Information on Advantages
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Advantage 1：Offers fast transient response with current mode control system.
Advantage 2： Offers high efficiency for all load range.
・For lighter load:
・For heavier load:
Advantage 3：・Supplied in smaller package due to small-sized power MOS FET incorporated.
R
C
ITH
ITH
Utilizes the current mode control mode called SLLM
switching dissipation (P
on-resistance dissipation (P
Utilizes the synchronous rectifying mode and the low on-resistance
MOS FETs incorporated as power transistor.
Achieves efficiency improvement for heavier load.
Offers high efficiency for all load range with the improvements mentioned above.
V
Conventional product (VOUT of which is 3.3 volts)
I
OUT
OUT
ON resistance of P-channel MOS FET: 0.2 to 0.35 Ω (Typ.)
ON resistance of N-channel MOS FET: 0.15 to 0.25 Ω (Typ.)
Reduces a mounting area required.
・Allows reduction in size of application products
Convertor
Controller
Achieves efficiency improvement for lighter load.
DC/DC
(3 package like MOSP8, HSON8, SON008V5060)
Voltage drop due to sudden change in load was reduced by about 40%.
SW
V
CC
RON
), gate charge/discharge dissipation, ESR dissipation of output capacitor (P
) that may otherwise cause degradation in efficiency for lighter load.
L
Cin
Fig.90 Comparison of transient response
228mV
Fig.92 Example application
・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
Co
V
OUT
30/40
TM
for lighter load, which reduces various dissipation such as
www.DataSheet.co.kr
BD9109FVM (Load response I
V
I
OUT
OUT
(BD9110NV:Co=22µF, L=2.2µH)
10mm
R
C
ITH
ITH
100
50
0
0.001
15mm
TSZ02201-0J3J0AJ00090-1-2
C
C
IN
O
①
①inprovement by SLLM system
②improvement by synchronous rectifier
SLLM
Fig.91 Efficiency
Output current Io[A]
O
PWM
0.01
=100mA→600mA)
L
TM
02.MAR.2012 Rev.001
0.1
②
Datasheet
1
ESR
) and
Datasheet pdf - http://www.DataSheet4U.net/