BD9B400MUV Datasheet, PDF (16/34 Pages) Rohm – Integrated MOSFET Single Synchronous Buck DC/DC Converter

BD9B400MUV
Function explanation(s)
1. Basic Operation
(1) DC/DC Converter operation
BD9B400MUV is a synchronous rectifying step-down switching regulator that achieves faster transient response by
employing constant on-time control system. It utilizes switching operation in PWM (Pulse Width Modulation) mode
for heavier load, while it utilizes Deep-SLLM (Deep_Simple Light Load Mode) control for lighter load to improve
efficiency.
① Deep-SLLM Control
② PWM Control
Output Current IOUT [A]
Figure 40. Efficiency (Deep-SLLM Control and PWM Control)
① Deep-SLLM Control
VOUT
20mV/div
②PWM Control
VOUT
20mV/div
SW
2.0V/div
SW
2.0V/div
Figure 41. Switching Waveform at Deep-SLLM Control
(VIN=5.0V, VOUT=1.2V, IOUT=100mA)
Figure 42. Switching Waveform at PWM Control
(VIN=5.0V, VOUT=1.2V, IOUT=4A)
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22.Apr.2016 Rev.002