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BD9123MUV Datasheet(PDF) 6 Page - Rohm

Part # BD9123MUV
Description  Output 1.5A or Less 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

BD9123MUV Datasheet(HTML) 6 Page - Rohm

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Technical Note
6/17
www.rohm.com
2011.01 - Rev.A
© 2011 ROHM Co., Ltd. All rights reserved.
BD9123MUV
Information on advantages
Advantage 1: Offers fast transient response with current mode control system.
Fig.22 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 Pch side MOS FET : 0.35mΩ(Typ.)
ON resistance of Nch side MOS FET : 0.25mΩ(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.
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.
Fig.24 Example application
Conventional product (Load response IO=0.1A→0.6A)
BD9123MUV (Load response IO=0.6A→0.1A)
DC/DC
Convertor
RITH
L
Co
VOUT
CITH
VCC
Cin
VCC
R PGOOD
15mm
20mm
CITH
Co
RITH
CIN
L
RPGOOD
Cf
Rf
0.001
0.01
0.1
1
0
50
100
PWM
SLLM
inprovement by SLLM system
improvement by synchronous rectifier
Fig.23 Efficiency
Output current Io[A]
VOUT
27mV
VOUT
37mV
IOUT
IOUT


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