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BD9132MUV Datasheet(PDF) 10 Page - Rohm |
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BD9132MUV Datasheet(HTML) 10 Page - Rohm |
10 / 20 page www.rohm.com TSZ02201-0J3J0AJ00140-1-2 © ROHM Co., Ltd. All rights reserved. 10/18 02.MAR.2012 Rev.001 TSZ22111・15・001 BD9132MUV Datasheet Information on Advantages Advantage 1:Offers fast transient response with current mode control system. Voltage drop due to sudden change in load was reduced by about 50%. Fig.24 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 Highside MOS FET : 82mΩ(Typ.) ON resistance of Lowside MOS FET : 70mΩ(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. Reduces a mounting area required. Fig.26 Example application Conventional product (Load response IO=1A→3A) BD9132MUV (Load response IO=1A→3A) VOUT IOUT 145mV VOUT IOUT 62mV Fig.25 Efficiency ・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 0.001 0.01 0.1 1 0 50 100 ① ② PWM SLLM ①inprovement by SLLM system ②improvement by synchronous rectifier Output current Io[A] Output PGND GND Gm Amp R S Q OSC UVLO TSD + VCC VCC CLK SLOPE EN Current Comp Soft Start Current Sense/ Protect + Driver Logic + VREF ITH ADJ RITH CITH R1 R2 PVCC SW PVCC BST VCC 3.3V Input SCP 15mm 20mm R2 CITH Cf Co L R1 RITH Rf CBST CIN |
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