bd91361muv ROHM Co. Ltd., bd91361muv Datasheet
bd91361muv
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bd91361muv Summary of contents
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... BD91361MUV ●Description ROHM’s high efficiency step-down switching regulator BD91361MUV is a power supply designed to produce a low voltage including 0.8 volts from 5.5/3.3 volts power supply line. Offers high efficiency with our original pulse skip control technology and synchronous rectifier. Employs a current mode control system to provide faster transient response to sudden change in load. ● ...
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... Power Supply Voltage EN Voltage Logic input voltage Output voltage Setting Range SW average output current *6 In case set output voltage 1.6V or more should not be exceeded. ●Electrical characteristics ◎BD91361MUV (Ta=25℃ Parameter Standby current Active current EN Low voltage EN High voltage EN input current VID Low voltage ...
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... BD91361MUV ●Block Diagram, Application Circuit 【BD91361MUV】 4.0±0 Lot No. S 0.08 S 2.1±0.1 C0 1.0 +0.05 0.25 0.5 -0.04 VQFN020V4040 (Unit : mm) Fig.1 TOP View ●Pin No. & function table Pin Pin No. name pin pin pin pin pin 6 PVCC ...
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... BD91361MUV ●Characteristic curves (Reference data) 2.0 =1.2V】 【V OUT 1.6 1.2 0.8 0.4 Ta=25℃ Io=3A 0 INPUT VOLTAGE:V [V] CC Fig.3 Vcc-Vou T 1.25 =1.2V】 1.24 【V OUT 1.23 1.22 1.21 1.20 1.19 1.18 1.17 V =5V CC 1.16 Io=0A 1.15 -40 - 100 TEMPERATURE:Ta[℃] Fig. 6 Ta-V OUT 80 High side 70 60 Low side 50 V =3. -40 - 100 TEMPERATURE:Ta[ ℃ ...
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... BD91361MUV 1.1 1 0.9 0.8 Ta=25℃ 0.7 2.7 3.4 4.1 4.8 5.5 INPUT VOLTAGE:V [V] CC Fig.12 Power supply voltage- Operating frequency 【PWM control V =1.2V】 OUT SW VCC=5V Ta=25℃ Fig.15 SW waveform Io=4A 【V =1.2V】 OUT VID[1:0]=(0,0)→(1,1) 1.44V 1.2V Fig.18 Change Response www.rohm.com © 2010 ROHM Co., Ltd. All rights reserved. 【V =1.2V】 OUT V = ...
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... SCP ITH ADJ ITH ITH R1 www.rohm.com © 2010 ROHM Co., Ltd. All rights reserved. BD91361MUV (Load response I =1A→3A OUT 145mV I OUT Fig.20 Comparison of transient response Achieves efficiency improvement for lighter load. Achieves efficiency improvement for heavier load. ・Output capacitor Co required for current mode control: 22µF ceramic capacitor ・ ...
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... BD91361MUV ●Operation BD91361MUV is a synchronous rectifying step-down switching regulator that achieves faster transient response by employing current mode PWM control system. It utilizes switching operation in PWM (Pulse Width Modulation) mode for heavier load, while it utilizes SLLM (Simple Light Load Mode) operation for lighter load to improve efficiency. ...
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... BD91361MUV ●Description of operations ・Soft-start function EN terminal shifted to “High” activates a soft-starter to gradually establish the output voltage with the current limited during startup, by which it is possible to prevent an overshoot of output voltage and an inrush current. ・Shutdown function With EN terminal shifted to “Low”, the device turns to Standby Mode, and all the function blocks including reference voltage circuit, internal oscillator and drivers are turned to OFF. Circuit current during standby is 0µ ...
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... BD91361MUV ●Switching regulator efficiency Efficiency ŋ may be expressed by the equation shown below ×I OUT OUT OUT η= ×100[%]= Vin×Iin Pin Efficiency may be improved by reducing the switching regulator power dissipation factors P Dissipation factors resistance dissipation of inductor and FET : PD(I 2) Gate charge/discharge dissipation : PD(Gate) ...
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... BD91361MUV ●About setting the output voltage Output voltage shifts step by step as often as bit setting to control the overshoot/undershoot that happen when changing the setting value of output voltage. From the bit switching until output voltage reach to setting value, 8 steps(max) delay will occur. VID<2:0> ...
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... BD91361MUV ●Consideration on permissible dissipation and heat generation As this IC functions with high efficiency without significant heat generation in most applications, no special consideration is needed on permissible dissipation or heat generation. In case of extreme conditions, however, including lower input voltage, higher output voltage, heavier load, and/or higher temperature, the permissible dissipation and/or heat generation must be carefully considered ...
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... (ΔI : Output ripple current, and f: Switching frequency) L =0.2×3A=0.6A, for example,(BD91361MUV) L =1.52µ → 2.0[µ Output capacitor should be selected with the consideration on the stability region and the equivalent series resistance required to smooth ripple voltage. Output ripple voltage is determined by the equation (4) : =Δ ...
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... BD91361MUV 4. Determination of RITH, CITH that works as a phase compensator As the Current Mode Control is designed to limit a inductor current, a pole (phase lag) appears in the low frequency area due filter consisting of a output capacitor and a load resistance, while a zero (phase lead) appears in the high frequency area due to the output capacitor and its ESR ...
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... CITH and RITH between the pins ITH and GND as neat as possible with least necessary wiring. ※VQFN020V4040 (BD91361MUV) has thermal PAD on the reverse of the package. The package thermal performance may be enhanced by bonding the PAD to GND plane which take a large area of PCB. ...
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... BD91361MUV ●Recommended components Lists on above application Symbol Part L Coil C Ceramic capacitor IN C Ceramic capacitor O C Ceramic capacitor ITH R Resistance ITH Cf Ceramic capacitor Rf Resistance C Ceramic capacitor BST ※The parts list presented above is an example of recommended parts. Although the parts are sound, actual circuit characteristics should be checked on your application carefully before use ...
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... BD91361MUV ●Notes for use 1. Absolute Maximum Ratings While utmost care is taken to quality control of this product, any application that may exceed some of the absolute maximum ratings including the voltage applied and the operating temperature range may result in breakage. If broken, short-mode or open-mode may not be identified expected to encounter with special mode that may exceed the absolute maximum ratings requested to take necessary safety measures physically including insertion of fuses ...
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... BD91361MUV ●Ordering part number Part No. Part No. 91361 (36: Adjustable (0.8 ~ 3.3V)) VQFN020V4040 4.0±0.1 1PIN MARK 0.08 S 2.1±0.1 C0.2 0 +0.05 0.25 -0.04 1.0 www.rohm.com © 2010 ROHM Co., Ltd. All rights reserved Package MUV : VQFN020V4040 <Tape and Reel information> Tape Embossed carrier tape Quantity ...
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No copying or reproduction of this document, in part or in whole, is permitted without the consent of ROHM Co.,Ltd. The content specified herein is subject to change for improvement without notice. The content specified herein is for the purpose ...