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BA9700 Datasheet(PDF) 1 Page - Rohm |
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BA9700 Datasheet(HTML) 1 Page - Rohm |
1 / 7 page BA9700A / BA9700AF / BA9700AFV Regulator ICs Switching regulator for DC / DC Converters BA9700A / BA9700AF / BA9700AFV The BA9700A, BA9700AF and BA9700AFV are switching regulators that use a pulse width modulation (PWM) system. They use a transistor switch to stabilize the output voltage. By the use of the transistor, power loss is decreased, fluctuation efficiency is improved, and the circuit is made more compact and single. ! ! ! !Features 1) Output voltage can step up, step down, or invert at an arbitrary level. 2) Low current consumption. (typically 1.7mA) 3) Wide oscillation frequency range. (typically 2.8k ~ 470kHz) 4) Built-in reference voltage current. (typically 2.57V) 5) Operates at low voltage. (minimally 3.55V) 6) Dead time controller restricts operation when overloaded. 7) Power switch can isolate all circuits in the IC. 8) Best suited for battery operated equipment. 9) Compact 14-pin SSOP package (BA9700AFV). ! ! ! !Block diagram 30k 30k Vref Error Amp PWM Comparator NON INVERT INPUT INVERT INPUT POWER SW 1/2 Vref Vref N. C. VCC FEED BACK D - TIME CONT N. C. OUT CT RT GND 14 13 12 11 10 9 8 123 456 7 + − Voltage Regulator Triangle Oscillator BA9700A BA9700AF ! ! ! !Absolute maximum ratings (Ta = 25 °C) *3 BA9700AFV : Reduced by 3.5 mW for each increase in Ta of 1˚C over 25˚C. Parameter Symbol Limits Unit VCC 24 V BA9700A Pd 600 mW BA9700AF 350 *2 *1 BA9700AFV 350 *3 Topr -20~+80 °C Tstg -55~+150 °C *2,*3 When mounted on a 5.0´5.0´1.6 mm glass epoxy board. *1 BA9700A: Reduced by 4.8 mW for each increase in Ta of 1˚C over 25˚C. Power supply voltage Power dissipation Operating temperature Storage temperature *2 BA9700AF: Reduced by 4.4 mW for each increase in Ta of 1˚C over 25˚C. |
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