Document
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 increase in Ta of 1˚C over 25˚C. *2 BA9700AF: Reduced by 4.4 mW for each increase in Ta of 1˚C over 25˚C. *3 BA9700AFV : Reduced by 3.5 mW for each increase in Ta of 1˚C over 25˚C. *2,*3 When mounted on a 5.0´5.0´1.6 mm glass epoxy board.
BA9700A / BA9700AF / BA9700AFV
Regulator ICs
!Electrical characteristics (unless otherwise noted, Ta = 25°C, VCC = 5.0V, Rt = 10kΩ, and Ct = 330pF)
Parameter
〈Reference voltage section〉 Output voltage 1/2 Vref output voltage Line regulation Load regulation 1 Load regulation 2 Output voltage when power decreases Output current when short-circuited 〈Triangular wave oscillation section〉 Oscillation frequency Standard deviation of oscillation frequency Frequency variation (VCC ) 〈Error amplifier section〉 Input offset voltage Input offset current Maximum input voltage Open loop gain Common-mode rejection ratio Input bias current 〈PWM comparator section〉 Threshold voltage 1 Threshold voltage 2 〈Output section〉 Output transistor leakage current Output saturation voltage 〈Total device〉 Quiescent current Standby current Operating voltage
Symbol
Min.
Typ.
Max.
Unit
Conditions
Vref 1/2 Vref Line Load1 Load2 Vref Iosc
2.48 1.22 2.48 -
2.57 1.29 3.00 1.00 6.00 2.57 10.0
2.66 1.36 12.0 5.00 10.0 2.66 30.0
V V mV mV mV V mA
Iref = 0.1mA
VCC = 3.55V~24V Iref = 0.1mA~1.0mA Iref = 0.1mA~8.0mA Iref = 0.1mA, VCC = 3.55V Vref = 0V RT = 10kΩ, CT = 330pF
RT and CT are constant
fosc fosc fdv
-
230 10 1
-
kHz % %
VCC = 3.55~24V
VIO IIO VICR AV CMRR .