BD9130NV_14 Datasheet, PDF (10/25 Pages) Rohm – Synchronous Buck Converter with Integrated FET

BD9130NV
3. Information on Advantages
Advantage 1：Offers fast transient response by using current mode control system
Conventional product (Load response IO=0.1A to 0.6A)
BD9139NV (Load response IO=1A to 2A)
VOUT
110mV
VOUT
29mV
IOUT
IOUT
Voltage drop due to sudden change in load was reduced.
Figure 24. Comparison of Transient Response
Advantage 2： Offers high efficiency for all load ranges
(a) For lighter load:
This IC utilizes the current mode control called SLLM^TM, which reduces various dissipations such as switching
dissipation (PSW), gate charge/discharge dissipation (PGATE), ESR dissipation of output capacitor (PESR) and
ON-Resistance dissipation (PRON) that may otherwise cause reduction in efficiency.
Achieves efficiency improvement for lighter load.
(b) For heavier load:
This IC utilizes the synchronous rectifying mode and uses low ON-Resistance
power MOSFETs.
ON-Resistance of P-Channel MOSFET : 200mΩ(Typ)
ON-Resistance of N-Channel MOSFET : 160mΩ(Typ)
100
SLLM^TM
②
50 _{① PWM}
①improvement by SLLM^TM system
②improvement by synchronous rectifier
0
0.001 0.01
0.1
1
Output current IOUT[A]
Figure 25. Efficiency
Achieves efficiency improvement for heavier load.
Offers high efficiency for all load ranges with the improvements mentioned above.
Advantage 3：・Supplied in smaller package due to small-sized power MOSFET.
・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)
Reduces the required mounting area.
VCC
DC/DC
Convertor
Controller
RITH
CITH
CIN
L
VOUT
CO
15mm
CIN
RITH
L
10mm
CITH
CO
Figure 26. Example Application
www.rohm.com
© 2012 ROHM Co., Ltd. All rights reserved.
TSZ22111・15・001
10/21
TSZ02201-0J3J0AJ00130-1-2
02.Oct.2014 Rev.002