UTC BA9741A LINEAR INTEGRATED CIRCUIT TWO-CHANNEL SWITCHING REGULATOR CONTORLLER DESCRIPTION The UTC BA9741A is a two-channel switching regulator controllers that use the PWM method. It can be used for DC to DC conversion for step-up, step-down, and inverting. The IC comes in a compact package, making it ideal for use in portable equipment. SOP-16 FEATURES TSSOP-16 *High-accuracy reference voltage circuit (±1%). *Time-latch, short-circuit protection circuit. *Miss-operation prevention circuit for low-voltage input *Reference voltage with output (2.5V) *Rest period adjustment is possible over the entire duty *range. APPLICATION DIP-16 *DC/DC converters for video cameras and notebook computers etc. PIN CONFIGURATIONS CT 1 16 VREF RT 2 15 SCP NON1 3 ERROR AMPLIFIER 1 INV1 4 UTC 14 NON2 13 INV2 FB1 5 12 FB2 DT1 6 11 DT2 OUT1 7 10 OUT2 GND 8 9 ERROR AMPLIFIER 2 Vcc UNISONIC TECHNOLOGIES CO., LTD. 1 QW-R103-019,A UTC BA9741A LINEAR INTEGRATED CIRCUIT PIN DESCRIPTIONS PIN NO. PIN NAME 1 CT FUNCTOIN External timing capacitor External timing resistor 2 RT 3 NON1 Positive input for error amplifier 1 4 INV1 Negative input for error amplifier 1 5 FB1 Error amplifier 1 output 6 DT1 Output 1 dead time/soft start setting 7 OUT1 Output 1 8 GND Ground 9 Vcc Power supply 10 OUT2 11 DT2 Output 2 dead time / soft start setting 12 FB2 Error amplifier 2 output 13 INV2 Negative input for error amplifier 2 14 NON2 Positive input for error amplifier 2 15 SCP 16 VREF Output 2 Time latch setting Reference voltage output (2.5V) BLOCK DIAGRAM Vcc 9 VREF 16 Vref RT 2 CT 1 Reference Voltage Triangle Oscillator 7 OUT1 NON 1 3 + INV 1 4 - FB 1 5 NON 2 14 + INV 2 13 - FB 2 12 + + - Err Amp 1 + + SCP Comp PWM Comp1 10 OUT2 Err Amp 2 + + Vref PWM Comp2 Vref Vref SCP 15 S Timer Latch R R UVLO 6 11 DT1 DT2 UTC 8 GND UNISONIC TECHNOLOGIES CO., LTD. 2 QW-R103-019,A UTC BA9741A LINEAR INTEGRATED CIRCUIT ABSOLUTE MAXIMUM RATINGS( Ta=25°C ) SYMBOL VALUE UNIT Power Supply Voltage PARAMETER Vcc 36 V Power Dissipation (note 1) SOP-16 DIP-16 Pd 500 mW 650 Operating Temperature Topr Storage Temperature °C -40 to 85 Tstg -55 to 125 °C Output Current Io 120(note 2) mA Output Voltage Vo 36 V Note 1: When mounted on 70mm*70mm*1.6mm glass epoxy board. Reduced by 5.0mW,for each increase in Ta of 1°C over 25°C Note 2: Should not exceed Pd and ASO values. RECOMMENDED OPERATING CONDITIONS( Ta=25°C ) PARAMETER Power Supply Voltage Output Current SYMBOL MIN TYP. MAX UNIT Vcc 3.6 6.0 35 100 V mA 35 V 1.6 15000 50 800 V pF kΩ kHz Io Output Voltage Vo Error Amplifier Input Voltage Timing Capacitor Timing Resistor Oscillator Frequency VOM CCT RRT FOSC 0.3 100 5.1 10 ELECTRICAL CHARACTERISTICS( TA=25°C ,VCC=6V,UNLESS OTHERWISE NOTED.) PARAMETER SYMBOL TEST CONIDITIONS MIN TYP. MAX UNIT REFERENCE VOLTAGE BLOCK Output Voltage Vref Iref =1mA 2.5 2.6 V Input Stability VDLI Vcc =3.6~35V 1 10 mV Load Stability VDLO Iref =0~5mA 1 10 mV TRIANGULAR WAVE OSCILLATOR Oscillation Frequency Fosc RRT=10 kΩ ,CCT=220pF 400 480 kHz Frequency Deviation FDV Vcc=3.6~35V PROTECTION CIRCUIT Threshold Voltage Standby Voltage VIT No pull up Latch Voltage VLT No pull up Source Current ISCP Comparator Threshold Voltage VCT UTC 320 1 1.48 VSTB REST PERIOD ADJUSTMENT CIRCUIT Input Threshold Voltage Vt0 (fosc=10kHz) Vt100 2.4 % 1.64 1.80 V 50 100 mV 30 100 mV 1.5 2.5 3.5 µA 5Pin,12Pin 0.9 1.05 1.2 V Duty Cycle =0% 1.79 1.97 2.15 V Duty Cycle =100% 1.32 1.48 1.64 V UNISONIC TECHNOLOGIES CO., LTD. 3 QW-R103-019,A UTC BA9741A LINEAR INTEGRATED CIRCUIT PARAMETER SYMBOL TEST CONIDITIONS MIN DON Divide Vref using 13 kΩ and27 kΩ 45 IBDT DT1,DT2=2.0V TYP. MAX UNIT On Duty Cycle Input Bias Current Latch Mode Source Current IDT DT1,DT2=0V 200 560 µA VDT IDT=40µA 2.28 2.48 V 2.53 V Latch Input Voltage LOW-VOLTAGE INPUT MISS-OPERATION PREVENTION CIRCUIT Threshold Voltage VUT 55 65 % 0.1 1 µA ERROR AMPLIFIER Input Offset Voltage VIO 6 Input Offset Current IIO 30 nA Input Bias Current IIB 100 nA Open Circuit Gain 15 AV Common-mode Input Voltage range Common-mode Rejection Ratio VOM 70 Vcc=3.6~35V 85 mV dB 0.3 1.6 80 V CMRR 60 dB Maximum Output Voltage VOH 2.3 Minimum Input Voltage VOL Output Sink Current IOI FB=1.25V 3 20 mA Output Source Current IOO FB=1.25V 45 75 µA PWM COMPARATOR Input Threshold Voltage (fosc=10kHz) Vt0 Duty Cycle =0% 1.79 1.97 2.15 V Vt100 Duty Cycle =100% 1.32 1.48 1.64 V OUTPUT BLOCK Saturation Voltage VSAT Io=75mA 0.8 1.2 V Leak Current IREAK Vo=35V 0 5 µA TOTAL DEVICE Standby Current Iccs When output is off 1.3 1.8 mA Average Current Consumption IccA RRT=10 kΩ 1.6 2.3 mA 2.5 V 0.7 0.9 V TIMING CHART Triangular wave output(from oscillator) Error amplifier output Dead-time input voltage 1.97V 1.05V Short protection comparator 1.48V PWM comparator output Output waveform 1.64V SCP waveform tDT Short protection comparator output 2.53V Vcc > = 3.6V Lockout release Power supply voltage Figure. 1 UTC UNISONIC TECHNOLOGIES CO., LTD. 4 QW-R103-019,A UTC BA9741A LINEAR INTEGRATED CIRCUIT 1.0 0.5 0 -0.5 -1.0 2.2 V CC =6V RT1=10KΩ 2.0 Upper Voltage 1.8 1.6 Lower Voltage 1.4 -1.5 -20 0 20 40 60 80 Ambient Temperature : Ta (℃) 1.0 100K Oscillator Frequency :fosc (Hz) 1M Figure 5. Error Amplifier AC Gain Characteristic (40dB close) 50 Av 180 40 30 Gain :Av (dB) 0.8 0.6 0.4 20 10 0 90 θ 0 -10 -90 -20 -30 0.2 0 0 1.2 10K 100 Phase :θ(deg) -2.0 -40 Figure4. Output Current vs.Output Saturation Voltage 1.2 Output Saturation Voltage: Vosat (V) Figure 3. Swing Voltage vs. Frequency Figure 2. Reference Voltage vs.Ambient Temperature 2.0 VCC =6V 1.5 Iref = -1mA Swing Voltage :Vosc(V) Reference Voltage Variation:△Vref (%) ELECTRICAL CHARACTERISTIC CURVES 20 40 60 80 100 120 140 Output Current :Io (mA) -40 -50 100 -180 1K 10K 100K 1M Frequency :f (Hz) UTC assumes no responsibility for equipment failures that result from using products at values that exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or other parameters) listed in products specifications of any and all UTC products described or contained herein. UTC products are not designed for use in life support appliances, devices or systems where malfunction of these products can be reasonably expected to result in personal injury. Reproduction in whole or in part is prohibited without the prior written consent of the copyright owner. The information presented in this document does not form part of any quotation or contract, is believed to be accurate and reliable and may be changed without notice. UTC UNISONIC TECHNOLOGIES CO., LTD. 5 QW-R103-019,A