lv5781 Sanyo Semiconductor Corporation, lv5781 Datasheet
lv5781
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lv5781 Summary of contents
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... Step-down Converter Overview The LV5781 is a 1-channel chopper-type (low-side Schottky diode) step-down switching regulator. It incorporates an 80mΩ (typical) power MOSFET to achieve high-efficiency operation for 3A output currents. The output voltage is set internally to 3.3V. By adding two external resistors possible to set the voltage to any desired setting above 0.85V. Inrush current at startup can be prevented by the soft start function. Using the ON/OFF pins, the converter can be set to standby mode in which the current consumption is 10µ ...
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... Maximum on duty ratio Current limiting value Under voltage detection Under voltage detection hysteresis Thermal shutdown temperature Thermal shutdown temperature hysteresis *These are design guarantee values and no measurements are made. LV5781 Symbol Conditions V IN max VBT max VSW max VBS max Vfs max ...
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... Package Dimensions unit : mm (typ) 3313 6 0.15 0.22 1.3 0.65 (2.35) 1.5 SANYO : HSSOP14(225mil) Block Diagram and Sample Application Circuits FB_GND FB0 FB1 FB2 OERRAMP 6.5µA SS Internal Enable Reg ON OFF LV5781 1.0 0.85 0.8 0.6 0.4 0.2 0 -40 -20 CBOOT BOOT(SW OSC Error PWM 180kHz comparator Amp S/D S/D S/D 3.2V Vref UVLO TSD 1.25V GND Pd max -- Ta Mounted on a specified board: 114.3mm× ...
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... FB0 and V OUT pins and capacitor between the OERRAMP pin and GND (the capacitors shown inside the broken lines in the diagram) are used for phase compensation. Their capacitance is intended to stop oscillation when oscillation is caused by the status of the output capacitor. As such, they can be left open under normal circumstances. LV5781 ...
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... FB2 14 FB0 FB_GND LV5781 GND of output voltage setting pins FB0 and FB2 connected to GND for use when pin FB2 is used. Output ON/OFF with an active-high polarity. When set to L, the current consumption is reduced to 10µA or less. Soft start time constant setting. The charge current is set to approx. 6.5µA and when a capacitor of 0.1µF is connected between this pin and GND, the output rises in approx ...
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... Continued from preceding page Pin No. Pin Name 2 ENABLE FB0 GND PGND 11 CBOOT 12 OERRAMP LV5781 Equivalent Circuit V IN 55kΩ ENABLE 100kΩ GND 300Ω CBOOT 1kΩ 6.5µA Vref 300Ω 100Ω SS 97kΩ PGND ...
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... SANYO Semiconductor Co.,Ltd. shall not be liable for any claim or suits with regard to a third party's intellctual property rights which has resulted from the use of the technical information and products mentioned above. This catalog provides information as January, 2007. Specifications and information herein are subject to change without notice. LV5781 PS No.A0663-7/7 ...