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UTC BA9741
LINEAR INTEGRATED CIRCUIT
TWO-CHANNEL SWITCHING REGULATOR CONTORLLER
DESCRIPTION
The UTC BA9741 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
*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.
TSSOP-16
APPLICATION
*DC/DC converters for video cameras and notebook computers etc.
DIP-16
PIN CONFIGURATIONS
CT RT
1 2
16 15
VREF SCP ERROR AMPLIFIER 2
NON1 3 ERROR AMPLIFIER 1 INV1 4 FB1 DT1 OUT1 GND
14 NON2 13 INV2 12 11 10 9
FB2 DT2 OUT2 Vcc
5 6 7 8
UTC
UNISONIC TECHNOLOGIES CO., LTD.
1
QW-R103-017,B
UTC BA9741
PIN DESCRIPTIONS
PIN NO.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
LINEAR INTEGRATED CIRCUIT
PIN NAME
CT RT NON1 INV1 FB1 DT1 OUT1 GND Vcc OUT2 DT2 FB2 INV2 NON2 SCP VREF External timing capacitor External timing resistor Positive input for error amplifier 1 Negative input for error amplifier 1 Error amplifier 1 output Output 1 dead time/soft start setting Output 1 Ground Power supply Output 2 Output 2 dead time / soft start setting Error amplifier 2 output Negative input for error amplifier 2 Positive input for error amplifier 2 Time latch setting Reference voltage output (2.5V)
FUNCTOIN
BLOCK DIAGRAM
Vcc 9 Vref Reference Voltage CT 1 RT 2
VREF 16
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 8 GND
UTC
UNISONIC TECHNOLOGIES CO., LTD.
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QW-R103-017,B
UTC BA9741
PARAMETER
Power Supply Voltage Power Dissipation (note 1) SOP-16 DIP-16 Operating Temperature Storage Temperature Output Current Output Voltage
LINEAR INTEGRATED CIRCUIT
SYMBOL
Vcc Pd 500 650 Topr Tstg Io Vo -40 to 85 -55 to 125 120(note 2) 36 C C mA V mW
ABSOLUTE MAXIMUM RATINGS( Ta=25C )
VALUE
36
UNIT
V
Note 1: When mounted on 70mm*70mm*1.6mm glass epoxy board. Reduced by 5.0mW,for each increase in Ta of 1C over 25C Note 2: Should not exceed Pd and ASO values.
RECOMMENDED OPERATING CONDITIONS( Ta=25C )
PARAMETER
Power Supply Voltage Output Current Output Voltage Error Amplifier Input Voltage Timing Capacitor Timing Resistor Oscillator Frequency
SYMBOL
Vcc Io Vo VOM CCT RRT FOSC
MIN
3.6
TYP.
6.0
MAX
35 100 35 1.6 15000 50 800
UNIT
V mA V V pF k kHz
0.3 100 5.1 10
ELECTRICAL CHARACTERISTICS( TA=25C ,VCC=6V,UNLESS OTHERWISE NOTED.)
PARAMETER
REFERENCE VOLTAGE BLOCK Output Voltage Input Stability Load Stability TRIANGULAR WAVE OSCILLATOR Oscillation Frequency Frequency Deviation PROTECTION CIRCUIT Threshold Voltage Standby Voltage Latch Voltage Source Current Comparator Threshold Voltage
SYMBOL
Vref VDLI VDLO Fosc FDV VIT VSTB VLT ISCP VCT
TEST CONIDITIONS
Iref =1mA Vcc =3.6~35V Iref =0~5mA RRT=10 k ,CCT=220pF Vcc=3.6~35V
MIN
2.4
TYP. MAX UNIT
2.5 1 1 2.6 10 10 480 V mV mV kHz % 1.80 100 100 3.5 1.2 2.15 1.64 V mV mV A V V V
320
400 1
1.48 No pull up No pull up 1.5 5Pin,12Pin Duty Cycle =0% Duty Cycle =100% 0.9 1.79 1.32
1.64 50 30 2.5 1.05 1.97 1.48
REST PERIOD ADJUSTMENT CIRCUIT Input Threshold Voltage Vt0 (fosc=10kHz) Vt100
UTC
UNISONIC TECHNOLOGIES CO., LTD.
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QW-R103-017,B
UTC BA9741
PARAMETER
On Duty Cycle Input Bias Current Latch Mode Source Current Latch Input Voltage
LINEAR INTEGRATED CIRCUIT
SYMBOL
DON IBDT IDT VDT
TEST CONIDITIONS
Divide Vref using 13 k and27 k DT1,DT2=2.0V DT1,DT2=0V IDT=40A
MIN
45 200 2.28
TYP. MAX UNIT
55 0.1 560 2.48 2.53 6 30 15 100 1.6 80 2.5 0.7 0.9 20 75 1.97 1.48 0.8 0 1.3 1.6 2.15 1.64 1.2 5 1.8 2.3 65 1 % A A V V mV nA nA dB V dB V V mA A V V V A mA mA
LOW-VOLTAGE INPUT MISS-OPERATION PREVENTION CIRCUIT Threshold Voltage VUT ERROR AMPLIFIER Input Offset Voltage Input Offset Current Input Bias Current Open Circuit Gain Common-mode Input Voltage range Common-mode Rejection Ratio Maximum Output Voltage Minimum Input Voltage Output Sink Current Output Source Current PWM COMPARATOR Input Threshold Voltage (fosc=10kHz) OUTPUT BLOCK Saturation Voltage Leak Current TOTAL DEVICE Standby Current Average Current Consumption VIO IIO IIB AV VOM CMRR VOH VOL IOI IOO Vt0 Vt100 VSAT IREAK Iccs IccA FB=1.25V FB=1.25V Duty Cycle =0% Duty Cycle =100% Io=75mA Vo=35V When output is off RRT=10 k 3 45 1.79 1.32 Vcc=3.6~35V 70 0.3 60 2.3
85
TIMING CHART
Triangular wave output(from oscillator) Error amplifier output Dead-time input voltage Short protection comparator 1.97V
1.05V
1.48V
PWM comparator output Output waveform 1.64V SCP waveform Short protection comparator output 2.53V Power supply voltage Figure. 1 Vcc > 3.6V = Lockout release
tDT
UTC
UNISONIC TECHNOLOGIES CO., LTD.
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QW-R103-017,B
UTC BA9741
LINEAR INTEGRATED CIRCUIT
Figure 3. Swing Voltage vs. Frequency 2.2 2.0 VCC =6V RT1=10K Upper Voltage
ELECTRICAL CHARACTERISTIC CURVES
Figure 2. Reference Voltage vs.Ambient Temperature 2.0 VCC=6V 1.5 Iref = -1mA 1.0 0.5 0 -0.5 -1.0 -1.5 -2.0 -40 -20 0 20 40 60 80 Ambient Temperature : Ta () 100 1.2 10K 100K Oscillator Frequency :fosc (Hz) 1M Swing Voltage :Vosc(V)
Reference Voltage Variation: Vref (%)
1.8
1.6 1.4
Lower Voltage
Figure4. Output Current vs.Output Saturation Voltage 1.2 Output Saturation Voltage: Vosat (V) 1.0 0.8 0.6 0.4 0.2 0 0 20 40 60 80 100 120 140 Output Current :Io (mA)
Figure 5. Error Amplifier AC Gain Characteristic (40dB close) 50 Av 180 40 30 10 0 -10 -20 -30 -40 -50 100 -180 1K 10K 100K 1M -90 Phase :(deg) Gain :Av (dB) 20 90 0
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-R103-017,B

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