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Regulator ICs
Low saturation voltage type regulator with ON / OFF switch
BAffST series
The BAffST series are variable, fixed output low drop-out type voltage regulators with an ON / OFF switch. These regulators are used to provide a stabilized output voltage from a fluctuating DC input voltage. Fixed output voltages are 3V, 3.3V, 5V, 6V 7V, 8V, 9V, 10V, 12V, and 15V. The maximum current capacity is 1A for each of the above voltages. (Items marked with an asterisk are under development.) Applications Constant voltage power supply Features 1) Built-in overvoltage protection circuit, overcurrent protection circuit and thermal shutdown circuit. 2) TO220FP-5 package can be used in wide range of applications.

3) 0A (design value) circuit current when switch is off. 4) Richly diverse lineup. 5) Low minimum I / O voltage differential.
Product codes
Absolute maximum ratings (Ta = 25C)
87
Regulator ICs
BAffST series
Block diagram
88
Regulator ICs
BAffST series
Pin descriptions
Recommended operating conditions BA00ST
BA08ST
BA03ST (under development)
BA09ST
BA033ST
BA10ST
BA05ST
BA12ST
BA06ST (under development)
BA15ST (under development)
BA07ST
89
Regulator ICs
Electrical characteristics BA00ST (unless otherwise noted, Ta = 25C, VCC = 10V, Io = 500mA)
BAffST series
BA03ST (unless otherwise noted, Ta = 25C, VCC = 8V, Io = 500mA) (under development)
90
Regulator ICs
BA033ST (unless otherwise noted, Ta = 25C, VCC = 8V, Io = 500mA)
BAffST series
BA05ST (unless otherwise noted, Ta = 25C, VCC = 10V, Io = 500mA)
91
Regulator ICs
BA06ST ( unless otherwise noted, Ta = 25C, VCC = 11V, Io = 500mA) (under development)
BAffST series
BA07ST (unless otherwise noted, Ta = 25C, VCC = 12V, Io = 500mA)
92
Regulator ICs
BAffST series
BA08ST (unless otherwise noted, Ta = 25C, VCC = 13V, Io = 500mA)
BA09ST (unless otherwise noted, Ta = 25C, VCC = 14V, Io = 500mA)
93
Regulator ICs
BA10ST (unless otherwise noted, Ta = 25C, VCC = 15V, Io = 500mA)
BAffST series
BA12ST (unless otherwise noted, Ta = 25C, VCC = 17V, Io = 500mA)
94
Regulator ICs
BA15ST (unless otherwise noted, Ta = 25C, VCC = 20V, Io = 500mA) (under development)
BAffST series
95
Regulator ICs
BAffST series
Measurement circuits (The C pin only exists on the BA00AST, For the BA00AST, place a 6.8 k resistor between the OUT and C pins, and a 2.2 k resistor between the C and GND pins.)
96
Regulator ICs
Operation notes (1) Operating power supply voltage When operating within the normal voltage range and within the ambient operating temperature range, most circuit functions are guaranteed. The rated values cannot be guaranteed for the electrical characteristics, but there are no sudden changes of the characteristics within these ranges. (2) Power dissipation Heat attenuation characteristics are noted on a separate page and can be used as a guide in judging power dissipation. If these ICs are used in such a way that the allowable power dissipation level is exceeded, an increase in the chip temperature could cause a reduction in the current capability or could otherwise adversely affect the performance of the IC. Make sure a sufficient margin is allowed so that the allowable power dissipation value is not exceeded. (3) Output oscillation prevention and bypass capacitor Be sure to connect a capacitor between the output pin and GND to prevent oscillation. Since fluctuations in the valve of the capacitor due to temperature changes may cause oscillations, a tantalum electrolytic capacitor with a small internal series resistance (ESR) is recommended. A 22 F capacitor is recommended; however, be aware that if an extremely large capacitance is used (1000 F or greater), then oscillations may occur at low frequencies. Therefore, be sure to perform the appropriate verifications before selecting the capacitor. Also, we recommend connecting a 0.33 F bypass capacitor as close as possible between the input pin and GND. (4) Current overload protection circuit A current overload protection circuit is built into the out-
BAffST series
puts, to prevent IC destruction if the load is shorted. This protection circuit limits the current in the shape of a '7'. It is designed with a high margin, so that even if a large current suddenly flows through the large capacitor in the IC, the current is restricted and latching is prevented. However, these protection circuits are only good for preventing damage from sudden accidents. The design should take this into consideration, so that the protection circuit is not made to operate continuously (for instance, clamping at an output of 1VF or greater; below 1VF, the short mode circuit operates). Note that the capacitor has negative temperature characteristics, and the design should take this into consideration. (5) Thermal overload circuit A built-in thermal overload circuit prevents damage from overheating. When the thermal circuit is activated, the various outputs are in the OFF state. When the temperature drops back to a constant level, the circuit is restored. (6) Internal circuits could be damaged if there are modes in which the electric potential of the application's input (VCC) and GND are the opposite of the electric potential of the various outputs. Use of a diode or other such bypass path is recommended. (7) Although the manufacture of this product includes rigorous quality assurance procedures, the product may be damaged if absolute maximum ratings for voltage or operating temperature are exceeded. If damage has occurred, special modes (such as short circuit mode or open circuit mode) cannot be specified. If it is possible that such special modes may be needed, please consider using a fuse or some other mechanical safety measure. (8) When used within a strong magnetic field, be aware that there is a slight possibility of malfunction.
97
Regulator ICs
BAffST series
Electrical characteristic curves
External dimensions (Units: mm)
98

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