BA9700AF

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 IIB -6.0 -100 1.60 70.0 70.0 - 1.90 80.0 80.0 180 6.0 100 500 mV nA V dB dB nA Null Method Null Method Null Method Null Method Null Method Null Method Vt0 Vt100 1.25 2.04 1.43 2.24 - V V µA V DUTY 0% DUTY 100% Leak Vsat - 1.70 10.0 2.10 VO = 24V IO = 50mA ICC ICCS VCC 3.55 1.70 0 - 2.40 7.00 24.0 mA µA V RT = OPEN POWER SW = 2.5V POWER SW = 0V 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 VIN R9 GND 8 47k 10 3 2 SW1 C9 1000p R8 15k C8 470µ R7 560 Q1 2SB1009 L1 120µH 5V VOUT C5, C6 470µF ×2 RB100A D1 11 2.57V 30k Voltage Regulator Vref Triangle Oscillator GND 13 R1 43k 14 R2 15k C1 680p R3 7.5k C2 0.047µ 4 12 30k 1.29V 9 N.C. ERROR AMP + − 6 N.C. R6 560 PWM COMPARATOR 5 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 R9 GND 8 47k 10 3 2 SW1 C7 1000p R8 10k RB100A VOUT D1 VIN C6 470µ 330 R7 L1 220µH C4, C5 470µ ×2 11 2.57V 30k Voltage Regulator Vref Triangle Oscillator GND 13 1.29V 30k ERROR AMP 9 330 R6 R1 33k 14 R3 6.8k 6 + − R2 7.5k 0.047µ C2 C1 12 680p 4 PWM COMPARATOR 5 7 C3 1µ 1 L1: RCH-875 220K (Sumida Electronics) R4 22k R5 39k Fig.3 Inverting converter L1 VIN R11 GND 8 47k 10 3 2 Q1 2.57V 30k 13 R1 39k 14 R2 4.7k 12 C2 0.047µ C1 680p 4 30k ERROR AMP + − R3 7.5k PWM COMPARATOR 5 6 R6 470 Vref 1.29V 9 R7 470 Voltage Regulator Triangle Oscillator 2SB1009 R8 68 SW1 C8 1000p R1010k C7 100µ R9 470 22µH RB100A D1 12V VOUT C5, C6 470µ ×2 11 Q2 2SD1380 GND 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 C3 C9 R8 R5 C2 C10 R3 C1 BA9700A ( )+ ( )+ R1 C5 L + R4 C11 C4 R2 R6 VIN R9 VOUT Q1 GND + C8 B SW R7 C E GND + C7 C6 D BA9700A - 1 Fig.5 Step-down converter C2 R2 C1 C7 BA9700A R8 R5 R4 C3 C4 VOUT VIN SW R3 R9 + R1 C5 R6 L Q1 B GND + C6 + GND D1 C E BA9700A - 2 Fig.6 Inverting converter (BA9700A) C3 C4 C2 R10 R5 R4 R3 C1 BA9700A R6 R2 + R1 R8 Q1 Q2 + B C E C6 VOUT VIN SW R11 R7 GND + B C E GND R9 C7 L C5 Fig.7 Step-up converter (BA9700A) BA9700A / BA9700AF / BA9700AFV Regulator ICs !Electrical characteristic curves 1M 1M 4.00 3.50 100k FREQUENCY (Hz) (Hz) CT = 220pF 100k R T R T = kΩ RT = 20kΩ Vref (VOLTAGE) 10 3.00 2.50 2.00 1.50 1.00 0.50 FREQUENCY 10k CT = 2200pF = 10k 30 kΩ 1k CT = 0.022µF 1k 1k 10k RT (Ω) 100k 1M 100p 1000p CT (F) 0.01µ 0.1µ 0.00 5 10 15 20 25 VCC (V) Fig.8 Oscillation frequency characteristic vs. triangular wave oscillator resistance (1) Fig.9 Oscillation frequency characteristic vs. triangular wave oscillator resistance (2) Fig.10 Output voltage vs. operating voltage for the reference voltage section 80 PHASE (DEG) 300 200 100 0 -100 -200 GA I N (d B) 60 40 20 0 -20 -40 0 100 1k 10k 100k 1M 10M FREQUENCY (Hz) Fig.11 Phase and gain vs. frequency for the error amplifier BA9700A / BA9700AF / BA9700AFV Regulator ICs !External dimensions (Units : mm) BA9700A 19.4±0.3 14 8 6.5±0.3 BA9700AF 8.7±0.2 14 6.2±0.3 4.4±0.2 8 1 0.51Min. 4.25±0.3 7 7.62 1.5±0.1 1 7 0.3±0.1 3.2±0.2 0.11 1.27 0.4±0.1 0.3Min. 0.15 2.54 0.5±0.1 0°∼15° DIP14 SOP14 BA9700AFV 5.0±0.2 14 6.4±0.3 4.4±0.2 8 1.15±0.1 1 0.1 7 0.65 0.22±0.1 0.3Min. 0.1 SSOP - B14 0.15±0.1 0.15±0.1