BA9700A / BA9700AF / BA9700AFV
Regulator ICs
Switching regulator for DC / DC Converters
BA9700A / BA9700AF / BA9700AFV
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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) !Block diagram
NON INVERT INPUT 14 1/2 Vref 13 INVERT INPUT 12 Vref 11
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).
POWER SW 10
N. C. 9
VCC 8
+ − Error Amp
30k 30k Vref
Voltage
Regulator
BA9700A BA9700AF PWM Comparator Triangle Oscillator
1 D - TIME CONT
2 RT
3 CT
4 FEED BACK
5 OUT
6 N. C.
7 GND
!Absolute maximum ratings (Ta = 25°C)
Parameter
Power supply voltage
Symbol VCC
Limits 24 600 *1 350 *2 350 *3
Unit V
BA9700A
Power dissipation
BA9700AF BA9700AFV
Pd
mW
Operating temperature Storage temperature
Topr Tstg
-20~+80 -55~+150
°C °C
*1 BA9700A: Reduced by 4.8 mW for each incr...