bd8301muv ROHM Co. Ltd., bd8301muv Datasheet
bd8301muv
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bd8301muv Summary of contents
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... Built-in Power MOSFET BD8301MUV ● General Description ROHM’s highly-efficient step-up/down switching regulator BD8301MUV produces step-up/down output including 3.3 V from 1 cell of lithium battery with just one coil. This IC adopts an original step-up/down drive system and creates a higher efficient power supply than conventional Sepic-system or H-bridge system switching regulators. ● ...
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... BD8301MUV ● Electrical Characteristics (Unless otherwise specified °C, VCC = 3.7 V) Parameter Symbol [Low voltage input malfunction preventing circuit] Detection threshold voltage Hysteresis range ΔVUVhy [Oscillator] Oscillation frequency [Error AMP] INV threshold voltage Input bias current Soft-start time Output source current Output sink current ...
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... BD8301MUV ● Description of Pins Lx1 PGND PVCC PVCC 17 VCC 18 STB Fig.1 Pin layout ● Block Diagram STB STBY_IO GND q FB ERROR_AMP VREF Soft Start INV www.rohm.com ○ 2009 ROHM Co., Ltd. All rights reserved. c Pin No. ...
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... BD8301MUV ● Description of Blocks 1. VREF This block generates ERROR AMP reference voltage. The reference voltage is 0 UVLO Circuit for preventing low voltage malfunction Prevents malfunction of the internal circuit at activation of the power supply voltage or at low power supply voltage. Monitors VCC pin voltage to turn off all output FET and DC/DC converter output when VCC voltage is lower than 2.2 V, and reset the timer latch of the internal SCP circuit and soft-start circuit ...
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... BD8301MUV ● Reference Data (Unless otherwise specified 25°C, VCC = 3.7 V) 0.810 0.805 0.800 VCC=7.0V VCC=5.5V VCC=3.7V VCC=2.4V 0.795 0.790 - 100 TEMPERATURE [℃] Fig.3 INV threshold 1.20 1.15 1.10 1.05 1.00 0.95 0.90 0.85 0. VCC [℃] Fig.6 Oscillation frequency (power supply property) 0 INV=0.5V -5 -10 -15 -20 -25 -30 -35 -40 ...
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... BD8301MUV 300 Io=500mA 250 200 VCC=3.0V VCC=2.0V VCC=6.0V VCC=3.7V 150 100 50 0 -60 - 140 TEMPERATURE [℃] Fig.12 Lx2 Pch FET ON resistance 20 INV=1. PVCC VOLTAGE [V] Fig.15 PVCC input current www.rohm.com ○ 2009 ROHM Co., Ltd. All rights reserved. ...
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... BD8301MUV ● Example of Application Input: 2.8 to 5.5 V, output: 3 1.0 A, frequency 600 kHz 10uF(ceramic) murata GRM31CB11A106KA01 2.8～5.5V RVIN ON/OFF 82k CVCC 1uF ● Example of Board Layout VBAT VCC www.rohm.com ○ 2009 ROHM Co., Ltd. All rights reserved PVCC 17 PVCC VCC 18 19 ...
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... BD8301MUV Reference Application Data ● 100 90 VBAT=2. VBAT=3. VBAT=4. 100 1000 OUTPUT CURRENT [mA] Fig.19 Power conversion efficiency ● Selection of Parts for Applications (1) Output inductor A shielded inductor that satisfies the current rating (current value, Ipeak as shown in the drawing below) and has a low DCR (direct current resistance component) is recommended ...
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... BD8301MUV (2) Output capacitor A ceramic capacitor with low ESR is recommended for output in order to reduce output ripple. There must be an adequate margin between the maximum rating and output voltage of the capacitor, taking the DC bias property into consideration. Output ripple voltage when ceramic capacitor is used is obtained by the following equation. ...
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... BD8301MUV (5) Determination of phase compensation Condition for stable application The condition for feedback system stability under negative feedback is as follows: - Phase delay is 135 °or less when gain dB) (Phase margin is 45° or higher) Since DC/DC converter application is sampled according to the switching frequency, the GBW of the whole system (frequency at which gain is 0 dB) must be set to be equal to or lower than 1/5 of the switching frequency ...
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... BD8301MUV ● I/O Equivalence Circuit FB VCC VOUT,Lx2,PGND VCC STB STB www.rohm.com ○ 2009 ROHM Co., Ltd. All rights reserved. c INV VCC INV FB PVCC,Lx1,PGND VOUT Lx2 PGND RT VCC Fig.29 I/O Equivalence Circuit 11/13 Technical Note VCC VCC PVCC Lx1 VCC PGND VCC VCC RT 2009.05 - Rev.B ...
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... BD8301MUV Precautions for Use ● 1) Absolute Maximum Rating We dedicate much attention to the quality control of these products, however the possibility of deterioration or destruction exists if the impressed voltage, operating temperature range, etc., exceed the absolute maximum ratings. In addition impossible to predict all destructive situations such as short-circuit modes, open circuit modes, etc special mode exceeding the absolute maximum rating is expected, please review matters and provide physical safety means such as fuses, etc ...
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... BD8301MUV Ordering part number Part No. Part No. VQFN020V4040 4.0±0.1 1PIN MARK 0.08 S 2.1±0.1 C0.2 1 +0.05 0.25 –0.04 0.5 www.rohm.com ○ 2009 ROHM Co., Ltd. All rights reserved Package MUV: VQFN020V4040 <Tape and Reel information> Tape Embossed carrier tape ...
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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 ...