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BU90005GWZ Datasheet(PDF) 2 Page - Rohm |
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BU90005GWZ Datasheet(HTML) 2 Page - Rohm |
2 / 24 page 2/21 Datasheet BU9000xGWZ series TSZ02201-0F2F0AG00010-1-2 © 2012 ROHM Co., Ltd. All rights reserved. 04.Jul.2012 Rev.001 www.rohm.co m TSZ22111・ ・ ・ ・15・ ・ ・ ・001 GND LX VIN EN + - SHUTDOWN TSD ERROR COMP FB Frequency control UVLO VREF Switching Control Logic and Gate Driver MODE PWM/PFM control B1 1.5~0.47uH 4.7uF VOUT 2.3~5.5V VOUT H : ON L : OFF L : PWM/PFM MODE H : PWM MODE A1 B2 A3 A2 B3 EN ● ● ● ● Block Diagram(s) ● ● ● ● Description of Block(s) The BU9000xGWZ are a synchronous step-down DC/DC converter that achieves fast transient response from light load to heavy load by hysteretic PWM control system and current constant PFM control system. ○ PWM control BU9000xGWZ operates by hysteretic PWM control. This scheme ensures fast switching, high efficiency, and fast transient response. When the output voltage is below the VREF voltage, the error comparator output is low to high and turning on P-channel MOSFET until above the VREF voltage and minimum on time. ○ PFM control At light load the regulator and MODE=low, the regulator operates with reduced switching frequency and improves the efficiency.During PFM operation, the output voltage slightly higher than typical output voltage. Figure 4. Operation of PFM mode and PWM mode Figure 3. Block Diagram(s) PFM (constant current)Threshold. turn off Pch FET output PWM mode voltage PFM Mode at Light Load PFM Threshold. turn on PFET PWM Mode at Moderate to Heavy Loads |
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