Document
UNISONIC TECHNOLOGIES CO., LTD
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.
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
ORDERING INFORMATION
Ordering Number
Lead Free
Halogen Free
BA9741L-D16-T
BA9741G-D16-T
- BA9741G-S16-R
- BA9741G-P16-R
Package
DIP-16 SOP-16 TSSOP-16
Packing
Tube Tape Reel Tape Reel
MARKING
DIP-16
SOP-16 / TSSOP-16
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QW-R103-017.C
BA9741
PIN CONFIGURATIONS
LINEAR INTEGRATED CIRCUIT
PIN DESCRIPTIONS
PIN NO. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
PIN NAME CT RT
NON1 INV1 FB1 DT1 OUT1 GND VCC OUT2 DT2 FB2 INV2 NON2 SCP VREF
FUNCTOIN 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)
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
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QW-R103-017.C
BA9741
BLOCK DIAGRAM
LINEAR INTEGRATED CIRCUIT
VCC CT RT 9 12
VREF 16 Vref
Reference Voltage
Triangle Oscillator
NON 1 3 INV 1 4 FB 1 5
NON 2 14 INV 2 13 FB 2 12
+
- Err Amp 1
+
- Err Amp 2
+ +
SCP Comp
-
Vref
+ + PWM
Comp1
+ + PWM
Comp2
SCP 15
Vref
STimeR r
Latch
URVL O
Vref
6 11 DT1 DT2
8 GND
7 OUT1 10 OUT2
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
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QW-R103-017.C
BA9741
LINEAR INTEGRATED CIRCUIT
ABSOLUTE MAXIMUM RATINGS (TA=25C, unless otherwise specified)
PARAMETER
SYMBOL
RATINGS
UNIT
Power Supply Voltage
VCC 36 V
Output Current
IO
120(note 2)
mA
Output Voltage
VO 36 V
Power Dissipation (Note 2)
SOP-16 DIP-16
PD 500 mW 650
Operating Temperature
TOPR
-40 ~ +85
C
Storage Temperature
TSTG
-55 ~ +125
C
Notes: 1. Absolute maximum ratings are those values beyond which the device could be permanently damaged.
Absolute maximum ratings are stress ratings only and functional device operation is not implied.
2. When mounted on 70mm×70mm×1.6mm glass epoxy board.
Reduced by 5.0mW, for each increase in TA of 1C over 25C. 3. Should not exceed Pd and ASO values.
RECOMMENDED OPERATING CONDITIONS (TA=25C, unless otherwise specified)
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
0.3 100 5.1 10
TYP
MAX
UNIT
6.0 35
V
100 mA
35 V
1.6 V
15000
pF
50 k
800 kHz
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
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QW-R103-017.C
BA9741
LINEAR INTEGRATED CIRCUIT
ELECTRICAL CHARACTERISTICS (TA=25C, VCC=6V, unless otherwise specified)
PARAMETER
SYMBOL
TEST CONIDITIONS
REFERENCE VOLTAGE BLOCK Output Voltage Input Stability Load Stability TRIANGULAR WAVE OSCILLATOR
VREF VDLI VDLO
IREF =1mA VCC =3.6~35V IREF =0~5mA
Oscillation Frequency Frequency Deviation PROTECTION CIRCUIT
FOSC FDV
RRT=10 kΩ, CCT=220pF VCC=3.6~35V
Threshold Voltage
VIT
Standby Voltage
VSTB
Latch Voltage
VLT
Source Current
ISCP
Comparator Threshold Voltage
VCT
REST PERIOD ADJUSTMENT CIRCUIT
No pull up No pull up
5Pin,12Pin
Input Threshold Voltage (fosc=10kHz)
Vt0 Vt100
Duty Cycle =0% Duty Cycle =100%
On Duty Cycle
DON Divide VREF using 13 kΩ and27 kΩ
Input Bias Current
IBDT DT1, DT2=2.0V
Latch Mode Source Current
IDT DT1, DT2=0V
Latch Input Voltage
VDT IDT=40µA
LOW-VOLTAGE INPUT MISS-OPERATION PREVENTION CIRCUIT
Threshold Voltage
VUT
ERROR AMPLIFIER
Input Offset Voltage Input Offset Current Input Bias Current Open Circuit Gain
VIO IIO IIB AV
Common-mode Input Voltage range VOM VCC=3.6~35V
Common-mode Rejection Ratio
CMRR
Maximum Output Voltage Minimum Input Voltage Output Sink Current Output Source Current
VOH VOL IOI FB=1.25V IOO FB=1.25V
PWM COMPARATOR Input Threshold Voltage (fosc=10kHz)
OUTPUT BLOCK Saturation Voltage Leak Current
Vt0 Vt100
Duty Cycle =0% Duty Cycle =100%
VSAT IREAK
IO=75mA VO=35V
TOTAL DEVICE Standby Current Average Current Consumption
ICCS When output is off ICCA RRT=10 kΩ
MIN TYP. MAX UNIT
2.4 2.5 2.6 V 1 10 mV 1 10 mV
320 400 480 kHz 1%
1.48 1.64 1.80 V 50 100 mV 30 100 mV
1.5 2.5 3.5 µA 0.9 1.05 1.2 V
1.79 1.97 2.15 V
1.32 1.48 1.64 V
45 55 65 %
0.1 1 µA
200 560
µA
2.28 2.48
V
2.53 V
6 mV
30 nA
15 100 .