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BD9130NV Datasheet(PDF) 5 Page - Rohm

Part # BD9130NV
Description  Output 2A or More High-efficiency Step-down Switching Regulator with Built-in Power MOSFET
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Manufacturer  ROHM [Rohm]
Direct Link  http://www.rohm.com
Logo ROHM - Rohm

BD9130NV Datasheet(HTML) 5 Page - Rohm

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BD9130NV
Technical Note
5/14
www.rohm.com
2009.05 - Rev.A
© 2009 ROHM Co., Ltd. All rights reserved.
Information on advantages
Advantage 1:Offers fast transient response with current mode control system.
Voltage drop due to sudden change in load was reduced by about 50%.
Fig.18 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 : 200mΩ(Typ.)
ON resistance of N-channel MOS FET : 160mΩ(Typ.)
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.
Reduces a mounting area required.
Fig.20 Example application
DC/DC
Convertor
Controller
RITH
L
Co
VOUT
CITH
VCC
Cin
10mm
15mm
RITH
CITH
CIN
CO
L
Fig.19 Efficiency
VOUT
IOUT
VOUT
IOUT
110mV
Conventional product (Load response IO=0.1A→0.6A)
BD9139NV (Load response IO=1A→2A)
Output capacitor Co required for current mode control: 22μF ceramic capacitor
Inductance L required for the operating frequency of 1 MHz: 2.2μH inductor
(BD9130NV:Co=22μF, L=2.2μH)
0.001
0.01
0.1
1
0
50
100
PWM
SLLM
TM
inprovement by SLLM
TM system
improvement by synchronous rectifier
Output current Io[A]
29mV


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