BD8158FVM-TR Rohm Semiconductor, BD8158FVM-TR Datasheet
BD8158FVM-TR
Specifications of BD8158FVM-TR
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BD8158FVM-TR Summary of contents
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... TFT-LCD panel is suppressed. ●Features 1) Current mode PWM system 2) Input voltage is 2 5.5 V (BD8152FVM), 2 5.5 V (BD8158FVM, providing the low power input) 3) Switching frequency is variable as 600 kHz/1,200 kHz. 4) Built-in 0.25 Ω power switch 5) Feedback voltage 1.245 1% ...
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... Standby current Average consumption current This product is not designed for protection against radio active rays. *Design guarantee (No total shipment inspection is made.) ●Electrical Characteristics BD8158FVM (Unless otherwise specified 25℃; Vcc = 2.5 V; ENB = 2.5 V) Parameter [triangular waveform oscillator] Oscillating frequency 1 Oscillating frequency 2 ...
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... BD8152FVM, BD8158FVM ●Reference Data (Unless otherwise specified 25°C) 2.00 1.75 1.50 1.25 -40°C 1.00 25°C 0.75 0.50 125°C 0.25 0. SUPPLY VOLTAGE:Vcc [V] Fig. 1 Total Supply Current -12 -16 -20 0 0 VOLTAGE:VSS[V] Fig Source Current 20 15 125°C 25°C 10 -40° 0.0 ...
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... BD8152FVM, BD8158FVM ●Reference Data (Unless otherwise specified 25°C) 100 -40 - 110 AMBIENT TEMPERATURE:Ta [ ℃ ] Fig. 10 Max. Duty Ratio Temperature 100 BD8158FVM 50 2.0 2.5 3.0 3.5 4.0 SUPPLY VOLTAGE:Vcc[V] Fig. 13 Power Efficiency vs Power Supply Voltage 9 8.8 8.6 8.4 8.2 8 2.0 2.5 3.0 3.5 4 ...
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... BD8152FVM, BD8158FVM ●Block Diagram Fig. 19 Pin Arrangement Diagram and Block Diagram ●Pin Assignment Diagram and Function Pin No. Pin name 1 COMP ENB 4 GND Vcc 7 FCLK 8 SS www.rohm.com © 2009 ROHM Co., Ltd. All rights reserved. SS FCLK 8 7 SLOPE OSC + Set LOGIC SOFT Reset ...
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... Protection circuit (UVLO/TSD) UVLO (under-voltage lockout protection circuit) shuts down the circuits when the voltage is 2.2 V (TYP.BD8152FVM),1.8 V (TYP.BD8158FVM) or lower. Thermal shutdown circuit shuts down IC at 175°C (Typ.) and recovers at 160°C (Typ.). Overcurrent protection circuit (OCP) Current flowing to the power FET is detected by voltage at the CURRENT SENSE and the overcurrent protection operates (Typ.). When the overcurrent protection operates, switching is turned off and the SS pin capacity is discharged. ...
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... BD8152FVM, BD8158FVM ●Timing Chart Startup sequence VCC ENB Overcurrent protection operating 2.5V VCC,ENB www.rohm.com © 2009 ROHM Co., Ltd. All rights reserved. Fig. 21 Startup Sequence Waveform Fig. 22 Overcurrent Protection Operating Waveform 7/16 Technical Note 2009.07 - Rev.B ...
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... IC internal element. LR BD8152FVM / BD8158FVM use the current mode DC/DC converter control and has the optimized design at the coil value. The following coil values are recommended from the aspects of power efficiency, response and safety. When the coil out of this range is selected, the stable continual operation is not guaranteed such as the switching waveform becomes irregular. Please pay attention to it. Switching frequency µ ...
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... BD8152FVM, BD8158FVM (4) Selecting the output rectification diode Schottky barrier diode is recommended as the rectification diode to use at the DC/DC converter output stage. Select the diode paying attention to the max. inductor current and max. output voltage. Max. Inductor current Max. output voltage Since each parameter has 30% to 40% of dispersion, be sure to design providing sufficient margins. ...
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... BD8152FVM, BD8158FVM (9) Setting the phase compensation circuit the current mode control, since the coil current is controlled, a pole (phase lag) made by the CR filter composed of the output capacitor and load resistor will be created in the low frequency range, and a zero (phase lead) by the output capacitor and ESR of capacitor will be created in the high frequency range ...
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... BD8152FVM, BD8158FVM ●Application Examples * Although ROHM is sure that the application examples are recommendable ones, further check the characteristics of components that require high precision before using them.When a circuit is used modifying the externally connected circuit constant, be sure to decide allowing sufficient margins considering the dispersion of values by external parts as well as our IC including not only the static but also the transient characteristic ...
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... BD8152FVM, BD8158FVM (3) When the circuit is intended to operate at the lower voltage than the IC operating range: Although the recommended operating range of IC starts from 2 2.1 V (BD8152FVM / BD8158FVM possible to continue operating by composing the self-energizing type step-up DC/DC converter application even if the input voltage lowered than 2.1 V. This example is recommended for the application with battery input. ...
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... BD8152FVM, BD8158FVM (5) When the Supply Voltage is over 4.0 V (BD8158FVM only) The Capacitor C4 is inserted to COMP pin, and it operates when the Supply Voltage is over 4 this case, Switching Frequency is limited to 600kHz. C1 10uF C2 0.01uF SOFT COMP C4 R3 100pF C3 Fig.34 Circuit Diagram Example(Supply Voltage over 4 ● ...
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... BD8152FVM, BD8158FVM ●Notes for use 1) Absolute maximum ratings Use of the IC in excess of absolute maximum ratings such as the applied voltage or operating temperature range may result in IC damage. Assumptions should not be made regarding the state of the IC (short mode or open mode) when such damage is suffered. A physical safety measure such as a fuse should be implemented when use of the special mode where the absolute maximum ratings may be exceeded is anticipated ...
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... BD8152FVM, BD8158FVM ●Power Dissipation Reduction 800 588 600 400 200 0 25 Fig. 37 Power Dissipation Reduction www.rohm.com © 2009 ROHM Co., Ltd. All rights reserved. On 70×70×1.6mm Board BD8158FVM BD8152FVM 100 125 AMBIENT TEMPERATURE[℃] 15/16 Technical Note 150 2009.07 - Rev.B ...
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... BD8152FVM, BD8158FVM ●Ordering part number Part No. Part No. 8152 8158 MSOP8 2.9±0.1 (MAX 3.25 include BURR) + 6° 4° −4° 1PIN MARK 0.145 0.475 S +0.05 −0.04 0.22 0.08 S 0.65 www.rohm.com © 2009 ROHM Co., Ltd. All rights reserved Package FVM : MSOP8 <Tape and Reel information> ...
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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 ...