BA9700

BA9700A ROHM

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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) 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 30k 30k Vref Error Amp PWM Comparator NON INVERT INPUT INVERT INPUT POWER SW1/2 V ref Vref N. C. VCC FEED BACK D - TIME CONT N. C.OUTCTRT GND 14 13 12 11 10 9 8 123 4567 + − Voltage Regulator Triangle Oscillator BA9700A BA9700AF !!!!Absolute maximum ratings (Ta = 25°C) *3 BA9700AFV : Reduced by 3.5 mW for each increase in Ta of 1˚C over 25˚C. Parameter Symbol Limits Unit VCC 24 V BA9700A Pd 600 mWBA9700AF 350 *2 BA9700AFV 350 *3 Topr -20~+80 °C Tstg -55~+150 °C *2,*3 When mounted on a 5.0´5.0´1.6 mm glass epoxy board. *1 BA9700A: Reduced by 4.8 mW for each increase in Ta of 1˚C over 25˚C. Power supply voltage Power dissipation Operating temperature Storage temperature *2 BA9700AF: Reduced by 4.4 mW for each increase in Ta of 1˚C over 25˚C.

BA9700A / BA9700AF / BA9700AFV Regulator ICs !Electrical characteristics (unless otherwise noted, Ta = 25°C, VCC = 5.0V, Rt = 10kΩ, and Ct = 330pF) Parameter Min. Typ. Max. Unit Conditions 2.48 2.57 2.66 V I ref = 0.1mA 1.22 1.29 1.36 V - 3.00 12.0 mV V CC = 3.55V~24V - 1.00 5.00 mV I ref = 0.1mA~1.0mA - 6.00 10.0 mV I ref = 0.1mA~8.0mA 2.48 2.57 2.66 V - 10.0 30.0 mA V ref = 0V - 230 - kHz -1 0-% -1- % -6.0 - mV -100 - nA 1.60 1.90 - V 70.0 80.0 - dB 70.0 80.0 - dB - 180 500 nA - 2.04 2.24 V 1.25 1.43 - V - - 10.0 µA - 1.70 2.10 V - 1.70 2.40 mA - 0 7.00 µA Symbol V ref 1/2 Vref Line Load1 Load2 V ref Iosc fosc fosc fdv VIO IIO VICR AV CMRR IIB Vt0 Vt100 Leak Vsat ICC ICCS VCC 3.55 - 24.0 V VO = 24V IO = 50mA 6.0 100 Null Method Null Method Null Method Null Method Null Method Null Method POWER SW = 0V V CC = 3.55~24V Iref = 0.1mA, VCC = 3.55V RT = 10kΩ, CT = 330pF DUTY 0% DUTY 100% RT = OPEN POWER SW = 2.5V R and C are constantTT 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 (V ) CC 〈Error amplifier section〉 Input offset voltage Input offset current Maximum input voltage Open loop gain Common-mode rejection ratio Input bias current Threshold voltage 1 Threshold voltage 2 Output transistor leakage current Output saturation voltage Quiescent current Standby current Operating voltage 1/2 V output voltageref 〈PWM comparator section〉 〈Output section〉 〈Total device〉 〈Reference voltage section〉

BA9700A / BA9700AF / BA9700AFV Regulator ICs !!!!Timing chart ERR. AMP OUTPUT DEAD - TIME H LPWM. COMP OUTPUT H L OUTPUT TR. COLLECTOR Fig.1 !!!!Application examples L1: RCH-875 121K (Sumida Electronics) Fig.2 Step-down converter 560 560 N.C. N.C. Q1 2SB1009 L1 120µH 470µ VOUT C5, C6 470µF ×2RB100A GND R815kC9 1000p 47k R9 SW1 Vref 2.57V 30k 30k 1.29V Triangle Oscillator Voltage Regulator ERROR AMP 680p 0.047µ 7.5k 15k 43k GND VIN PWM COMPARATOR C4 1µ R5 20kR4 15k 3108

BA9700A / BA9700AF / BA9700AFV Regulator ICs L1: RCH-875 220K (Sumida Electronics) Fig.3 Inverting converter 330 330 R Q1 2SB1009 220µH470µ VOUT C4, C5 C6 470µ RB100A GND R8 10kC7 1000p 47k R9 SW1 Vref 2.57V 30k 30k 1.29V 3108 Triangle Oscillator Voltage Regulator ERROR AMP 680p 0.047µC2 7.5k 6.8k 33k GND VIN PWM COMPARATOR C3 1µ R5 39kR4 22k L1: RCH-875 221K (Sumida Electronics) Fig.4 Step-up converter 470 470 470 R8 68 2SB1009 22µH 100µ 12V VOUT C5, C6 470µ RB100A GND R1010kC8 1000p 47k R11 SW1 Vref 2.57V 30k 30k 1.29V 108 Triangle Oscillator Voltage Regulator ERROR AMP 680p 0.047µ 7.5k 4.7k 39k GND VIN PWM COMPARATOR C4 1µ R5 39kR4 20k 2SD1380

BA9700A / BA9700AF / BA9700AFV Regulator ICs !!!!Basic application board patterns and component arrangemrnts + + ()() VOUT GND VIN GND C11 C10 LQ1 B C E BA9700A BA9700A - 1 SW D Fig.5 Step-down converter VOUT GND VIN GND R5R8 L B C E BA9700A BA9700A - 2 SW Fig.6 Inverting converter (BA9700A) VOUT GND VIN GND R8 R10 R11 C7 L SW Q1 Q2 BA9700A B C E B C E Fig.7 Step-up converter (BA9700A)

BA9700A / BA9700AF / BA9700AFV Regulator ICs !!!!Electrical characteristic curves 100k 10k 1k 10k 100k 1M FREQUENCY RT (Ω) CT = 2200pF CT = 220pF CT = 0.022µF (Hz) Fig.8 Oscillation frequency characteristic vs. triangular wave oscillator resistance (1) 100k 10k 100p 0.01 µ 0.1µ1000p FREQUENCY CT RT = 20kΩ R T = 10k Ω R T = 30k Ω (Hz) (F) Fig.9 Oscillation frequency characteristic vs. triangular wave oscillator resistance (2) 4.00 3.50 3.00 2.50 2.00 1.50 1.00 0.50 0.00 51 0 1 5 2 0 2 5 Vref VCC (V) (VOLTAGE) Fig.10 Output voltage vs. operating voltage for the reference voltage section 300 200 100 -100 -200 -20 -40 0 100 1k 10k 100k 1M 10M PHASE G A I N FREQUENCY (DEG) (d B) (Hz) Fig.11 Phase and gain vs. frequency for the error amplifier

BA9700A / BA9700AF / BA9700AFV Regulator ICs !!!!External dimensions (Units : mm) SOP14DIP14 BA9700A BA9700AF 6.5±0.3 19.4±0.3 0.5±0.1 3.2±0.2 4.25±0.3 14 8 0.3±0.1 0.51Min. 7.62 0°∼15°2.54 SSOP - B14 BA9700AFV 0.4±0.11.27 8.7±0.2 4.4±0.2 6.2±0.3 0.11 1.5±0.1 0.15 0.15±0.1 0.3Min. 0.1 0.22±0.10.65 6.4±0.3 4.4±0.2 5.0±0.2 1.15±0.1 0.15±0.1 0.3Min. 0.1