BD9152MUV Datasheet, PDF (6/18 Pages) Rohm – Output 1.5A or Less High Efficiency Step-down Switching Regulator with Built-in Power MOSFET

BD9152MUV
Technical Note
●Information on advantages
Advantage 1：Offers fast transient response with current mode control system.
Conventional product (Load response IO=0.5A→1.5A)
BD9152MUV (Load response IO=1.5A→0.5A)
VOUT1
VOUT1
IOUT
IOUT
Fig.24 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 (P_SW), gate charge/discharge dissipation, ESR dissipation of output capacitor (P_ESR) and on-resistance
dissipation (P_RON) 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 Highside MOS FET : 170mΩ(Typ.)
ON resistance of Lowside MOS FET : 130mΩ(Typ.)
Achieves efficiency improvement for heavier load.
Offers high efficiency for all load range with the improvements mentioned above.
100
SLLM
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.25 Efficiency
Advantage 3：・Supplied in smaller package due to small-sized power MOS FET incorporated.
・Output capacitor Co required for current mode control: 22μF ceramic capacitor
・Inductance L required for the operating frequency of 1 MHz: 2.2μH inductor
・Incorporates FET + Boot strap diode
Reduces a mounting area required.
RITH1
RITH2
L1
FB1 EN1 SW1 SW1 PGND1
ITH1
PGND1
AGND
N.C.
AVcc
PVcc
PVcc
PVcc
ITH2
PGND2
FB2 EN2 SW2 SW2 PGND2
L2
COUT1
VOUT1
CIN1
CIN2
15mm
COUT2
VOUT2
R2
Fig.26 Example application
R1
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6/17
20mm
COUT1 CIN1
COUT2
L1
R1 _L2
RITH1 RITH2
CITH1 CITH2 ^R2
2009.05 - Rev.A