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 NON INVERT INPUT 1/2 Vref INVERT INPUT Vref POWER SW N. C. VCC 14 13 12 11 10 9 8 + − Voltage Regulator 30k Error Amp 30k Vref BA9700A BA9700AF PWM Comparator Triangle Oscillator 1 2 3 D - TIME CONT RT CT 4 FEED BACK 5 6 7 OUT N. C. GND !Absolute maximum ratings (Ta = 25°C) Parameter Power supply voltage Symbol Limits Unit VCC 24 V 600 *1 BA9700A Power dissipation BA9700AF Pd 350 *2 mW 350 *3 BA9700AFV Operating temperature Topr -20~+80 °C Storage temperature Tstg -55~+150 °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 Symbol Min. Typ. Max. Unit Conditions 〈Reference voltage section〉 Output voltage 1/2 Vref output voltage Vref 2.48 2.57 2.66 V 1/2 Vref 1.22 1.29 1.36 V Iref = 0.1mA Line - 3.00 12.0 mV VCC = 3.55V~24V Load regulation 1 Load1 - 1.00 5.00 mV Iref = 0.1mA~1.0mA Load regulation 2 Iref = 0.1mA~8.0mA Line regulation Load2 - 6.00 10.0 mV Output voltage when power decreases Vref 2.48 2.57 2.66 V Output current when short-circuited Iosc - 10.0 30.0 mA Vref = 0V Oscillation frequency fosc - 230 - kHz RT = 10kΩ, CT = 330pF Standard deviation of oscillation frequency fosc - 10 - % RT and CT are constant Frequency variation (VCC ) fdv - 1 - % VCC = 3.55~24V VIO -6.0 - 6.0 mV Null Method Iref = 0.1mA, VCC = 3.55V 〈Triangular wave oscillation section〉 〈Error amplifier section〉 Input offset voltage IIO -100 - 100 nA Null Method VICR 1.60 1.90 - V Null Method AV 70.0 80.0 - dB Null Method CMRR 70.0 80.0 - dB Null Method IIB - 180 500 nA Null Method Threshold voltage 1 Vt0 - 2.04 2.24 V DUTY 0% Threshold voltage 2 Vt100 1.25 1.43 - V DUTY 100% Output transistor leakage current Leak - - 10.0 µA VO = 24V Output saturation voltage Vsat - 1.70 2.10 V IO = 50mA Quiescent current ICC - 1.70 2.40 mA RT = OPEN POWER SW = 2.5V Standby current ICCS - 0 7.00 µA POWER SW = 0V Operating voltage VCC 3.55 - 24.0 V Input offset current Maximum input voltage Open loop gain Common-mode rejection ratio Input bias current 〈PWM comparator section〉 〈Output section〉 〈Total device〉 BA9700A / BA9700AF / BA9700AFV Regulator ICs !Timing chart ERR. AMP OUTPUT DEAD - TIME H PWM. COMP OUTPUT L H OUTPUT TR. COLLECTOR L Fig.1 !Application examples L1 Q1 2SB1009 VIN R9 GND C9 1000p SW1 R8 15k C8 470µ 47k RB100A 8 11 2.57V 10 3 Voltage Regulator 5V VOUT 120µH R7 560 2 C5, C6 470µF ×2 D1 Triangle Oscillator GND 30k Vref 13 9 N.C. 6 N.C. 30k R1 43k ERROR AMP 14 R2 15k 1.29V C1 680p R3 7.5k R6 560 + − 12 PWM COMPARATOR 5 C2 4 0.047µ 7 C4 1µ 1 + L1: RCH-875 121K (Sumida Electronics) R4 15k R5 20k Fig.2 Step-down converter BA9700A / BA9700AF / BA9700AFV Regulator ICs Q1 2SB1009 VIN RB100A VOUT R9 GND SW1 D1 R8 10k 47k 2.57V 330 R7 C6 470µ 8 11 C7 1000p 10 3 Voltage Regulator L1 220µH 2 C4, C5 470µ ×2 Triangle Oscillator GND 30k Vref 13 ERROR AMP 14 R3 6.8k 9 1.29V 330 R6 30k R1 33k − C1 R2 6 + 12 7.5k 5 PWM COMPARATOR 680p 4 0.047µ C2 7 C3 1µ 1 L1: RCH-875 220K (Sumida Electronics) R5 39k R4 22k Fig.3 Inverting converter L1 RB100A VIN R11 GND C8 1000p SW1 22µH R1010k C7 100µ 47k 8 10 3 R9 470 C5, C6 470µ ×2 2 Q1 11 2.57V Voltage Regulator 2SB1009 Triangle Oscillator R8 68 30k 9 1.29V R7 470 30k R1 39k ERROR AMP 14 R2 4.7k Q2 2SD1380 Vref 13 12V VOUT D1 6 GND R6 470 + − R3 7.5k 12 C2 PWM COMPARATOR C1 680p 5 4 0.047µ 7 C4 1µ 1 L1: RCH-875 221K (Sumida Electronics) R4 20k R5 39k Fig.4 Step-up converter BA9700A / BA9700AF / BA9700AFV Regulator ICs !Basic application board patterns and component arrangemrnts R5 R8 C9 R2 R6 ( )+ ( )+ R1 R9 VIN C4 R4 C11 C3 C1 BA9700A R3 C10 C2 C5 VOUT + L Q1 B GND SW C R7 + GND E C8 C6 + D C7 BA9700A - 1 Fig.5 Step-down converter C7 C1 BA9700A R6 SW R3 VOUT C4 + R1 C5 R9 GND R5 R4 R2 VIN R8 C3 C2 L + Q1 B + GND C D1 E C6 BA9700A - 2 Fig.6 Inverting converter (BA9700A) C4 C3 R5 R10 C2 R4 R3 R6 C1 BA9700A Q2 B R7 C7 Fig.7 Step-up converter (BA9700A) Q1 R9 + VOUT R8 R11 SW GND C6 R2 + R1 VIN + GND B C C E E L C5 BA9700A / BA9700AF / BA9700AFV Regulator ICs !Electrical characteristic curves 1M 4.00 1M 3.50 R CT = 2200pF 10k CT = 0.022µF 1k T = 3.00 10 kΩ = RT = 20kΩ 30 kΩ 10k Vref (VOLTAGE) T 100k FREQUENCY FREQUENCY (Hz) R (Hz) CT = 220pF 100k 2.50 2.00 1.50 1.00 1k 0.50 1k 10k 100k 100p 1M Oscillation frequency characteristic vs. triangular wave oscillator resistance (1) Fig.9 200 100 (d B) 60 40 GA I N PHASE (DEG) 80 300 20 0 0 -100 -20 -200 -40 0 100 1k 10k 100k 1M FREQUENCY (Hz) Fig.11 0.01µ 0.1µ 0.00 Phase and gain vs. frequency for the error amplifier 10M Oscillation frequency characteristic vs. triangular wave oscillator resistance (2) 5 10 15 20 25 VCC (V) CT (F) RT (Ω) Fig.8 1000p Fig.10 Output voltage vs. operating voltage for the reference voltage section BA9700A / BA9700AF / BA9700AFV Regulator ICs !External dimensions (Units : mm) BA9700A BA9700AF 19.4±0.3 8.7±0.2 8 3.2±0.2 0.3±0.1 2.54 0.15±0.1 4.4±0.2 0.1 1.15±0.1 6.4±0.3 5.0±0.2 7 0.65 0.22±0.1 1.27 0.4±0.1 0.3Min. SOP14 BA9700AFV 1 7 0.15 DIP14 8 1 0°∼15° 0.5±0.1 14 8 0.15±0.1 1.5±0.1 7.62 14 4.4±0.2 6.2±0.3 7 0.51Min. 4.25±0.3 1 0.11 6.5±0.3 14 0.3Min. 0.1 SSOP - B14