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BA178M!!T / BA178M!!FP series
Regulator ICs
Standard 78M series, 3-pin regulator
BA178M!! / BA178M!! series !!T !!FP !! !!
The BA178M!!T and BA178M!!FP series are 3-pin, fixed positive output voltage regulators. These regulators are used to provide a stabilized output voltage from a fluctuating DC input voltage. There are 11 fixed output voltages, as follows : 5V, 6V, 7V, 8V, 9V, 10V, 12V, 15V, 18V, 20V, and 24V. The maximum current capacity is 0.5A for each of the above voltages.
"Application Constant voltage power supply
"Features 1) Built-in overcurrent protection circuit and thermal shutdown circuit. 2) Excellent ripple regulation. 3) Available in TO-220FP and TO252-3 packages, to meet wide range of applications. 4) Compatible with other manufacturers' regulators. 5) Richly diverse lineup. (5V, 6V, 7V, 8V, 9V, 10V, 12V, 15V, 18V, 20V, 24 V) "Product codes
Output voltage (V) Product No. Output voltage (V) Product No.
5 6 7 8 9 10
BA178M05T / FP BA178M06T / FP BA178M07T / FP BA178M08T / FP BA178M09T / FP BA178M10T / FP
12 15 18 20 24 -
BA178M12T / FP BA178M15T / FP BA178M18T / FP BA178M20T / FP BA178M24T / FP -
BA178M!!T / BA178M!!FP series
Regulator ICs
"Internal circuit configuration diagram
(1) INPUT R4 Q12 R10 R8 Q8 Q9 D2 Q16 Q15 R5 Q13 Q10 Q6 R6 Q5 R15 R2 Q7 Q2 Q14 R7 R22 Q1 R14 R10 R3 D3 Q4 Q3 R19 R16 Q11 Q18 R20 R12 Q17 R9 R13
R21 R17
R11
(3) OUTPUT
R1 D1
C1
(2) COMMON
"Absolute maximum ratings (Ta=25C) ^Common specifications for BA178M!!T / FP seriesp
Parameter Applied voltage Power dissipation TO220FP TO252-3 Operating temperature Storage temperature
(without heat sink).
Symbol VIN Pd Topr Tstg
Limits 35 2.0 1.0 -40~+85 -55~+150
Unit V W
C C
Reduced by 16 mW (TO220FP) and 8 mW (TO252-3) for each increase in Ta of 1C over 25C
"Recommended operating conditions (Ta=25C) BA178M05T / FP
Parameter Input voltage Output current Symbol VIN IO Min. 7.5 - Typ. - - Max. 20 0.5 Unit V A
BA178M06T / FP
Parameter Input voltage Output current Symbol VIN IO Min. 8.5 - Typ. - - Max. 21 0.5 Unit V A
BA178M07T / FP
Parameter Input voltage Output current Symbol VIN IO Min. 9.5 - Typ. - - Max. 22 0.5 Unit V A
BA178M08T / FP
Parameter Input voltage Output current Symbol VIN IO Min. 10.5 - Typ. - - Max. 23 0.5 Unit V A
BA178M09T / FP
Parameter Input voltage Output current Symbol VIN IO Min. 11.5 - Typ. - - Max. 24 0.5 Unit V A
BA178M10T / FP
Parameter Input voltage Output current Symbol VIN IO Min. 12.5 - Typ. - - Max. 25 0.5 Unit V A
BA178M!!T / BA178M!!FP series
Regulator ICs
BA178M12T / FP
Parameter Input voltage Output current Symbol VIN IO Min. 15 - Typ. - - Max. 27 0.5 Unit V A
BA178M15T / FP
Parameter Input voltage Output current Symbol VIN IO Min. 17.5 - Typ. - - Max. 30 0.5 Unit V A
BA178M18T / FP
Parameter Input voltage Output current Symbol VIN IO Min. 21 - Typ. - - Max. 33 0.5 Unit V A
BA178M20T / FP
Parameter Input voltage Output current Symbol VIN IO Min. 23 - Typ. - - Max. 33 0.5 Unit V A
BA178M24T / FP
Parameter Input voltage Output current Symbol VIN IO Min. 27 - Typ. - - Max. 33 0.5 Unit V A
"Electrical characteristics (unless otherwise noted, Ta=25C, VIN=10V, IO=350mA)
Parameter Output voltage 1 Output voltage 2 Input stability 1 Input stability 2 Ripple rejection ratio Load regulation 1 Load regulation 2 Temperature coefficient of output voltage Output noise voltage Minimum I/O voltage differential Bias current Bias current change 1 Bias current change 2 Peak output current Output short-circuit current Symbol VO1 VO2 Reg.I1 Reg.I2 R.R. Reg.L1 Reg.L2 TCVO Vn Vd Ib Ib1 Ib2 IO-P IOS Min. 4.8 4.75 - - 62 - - - - - - - - - - Typ. 5.0 - 3 1 78 20 10 -1.0 40 2.0 4.5 - - 875 0.4 Max. 5.2 5.25 100 50 - 100 50 - - - 6.0 0.5 0.8 - - Unit V V mV mV dB mV mV V V mA mA mA mA A IO=350mA VIN=7.5~20V, IO=5~350mA VIN=7~25V, IO=200mA VIN=8~12V, IO=200mA eIN=1Vrms, f=120Hz, IO=100mA IO=5~500mA IO=5~200mA Conditions Measurement circuit Fig.1 Fig.1 Fig.1 Fig.1 Fig.2 Fig.1 Fig.1 Fig.1 Fig.3 Fig.4 Fig.5 Fig.5 Fig.5 Fig.1 Fig.6
mV/C IO=5mA, Tj=0~125C f=10Hz~100kHz IO=500mA IO=0mA IO=5~350mA VIN=8~25V, IO=200mA Tj=25C VIN=25V
BA178M!!T / BA178M!!FP series
Regulator ICs
(unless otherwise noted, Ta=25C, VIN=11V, IO=350mA)
Parameter Output voltage 1 Output voltage 2 Input stability 1 Input stability 2 Ripple rejection ratio Load regulation 1 Load regulation 2 Temperature coefficient of output voltage Output noise voltage Minimum I/O voltage differential Bias current Bias current change 1 Bias current change 2 Peak output current Output short-circuit current Symbol VO1 VO2 Reg.I1 Reg.I2 R.R. Reg.L1 Reg.L2 TCVO Vn Vd Ib Ib1 Ib2 IO-P IOS Min. 5.75 5.7 - - 60 - - - - - - - - - - Typ. 6.0 - 3 1 74 20 10 -0.5 60 2.0 4.5 - - 875 0.4 Max. 6.25 6.3 100 50 - 120 60 - - - 6.0 0.5 0.8 - - Unit V V mV mV dB mV mV V V mA mA mA mA A IO=350mA VIN=8.5~21V, IO=5~350mA VIN=8~25V, IO=200mA VIN=9~25V, IO=200mA eIN=1Vrms, f=120Hz, IO=100mA IO=5~500mA IO=5~200mA Conditions Measurement circuit Fig.1 Fig.1 Fig.1 Fig.1 Fig.2 Fig.1 Fig.1 Fig.1 Fig.3 Fig.4 Fig.5 Fig.5 Fig.5 Fig.1 Fig.6
mV/C IO=5mA, Tj=0~125C f=10Hz~100kHz IO=500mA IO=0mA IO=5~350mA VIN=9~25V, IO=200mA Tj=25C VIN=25V
(unless otherwise noted, Ta=25C, VIN=13V, IO=350mA)
Parameter Output voltage 1 Output voltage 2 Input stability 1 Input stability 2 Ripple rejection ratio Load regulation 1 Load regulation 2 Temperature coefficient of output voltage Output noise voltage Minimum I/O voltage differential Bias current Bias current change 1 Bias current change 2 Peak output current Output short-circuit current Symbol VO1 VO2 Reg.I1 Reg.I2 R.R. Reg.L1 Reg.L2 TCVO Vn Vd Ib Ib1 Ib2 IO-P IOS Min. 6.7 6.65 - - 57 - - - - - - - - - - Typ. 7.0 - 4 1 71 20 10 -0.5 70 2.0 4.5 - - 875 0.4 Max. 7.3 7.35 100 50 - 140 70 - - - 6.0 0.5 0.8 - - Unit V V mV mV dB mV mV mV/C V V mA mA mA mA A IO=350mA VIN=9.5~22V, IO=5~350mA VIN=9~25V, IO=200mA VIN=10~25V, IO=200mA eIN=1Vrms, f=120Hz, IO=100mA IO=5~500mA IO=5~200mA IO=5mA, Tj=0~125C f=10Hz~100kHz IO=500mA IO=0mA IO=5~350mA VIN=10~25V, IO=200mA Tj=25C VIN=25V Conditions Measurement circuit Fig.1 Fig.1 Fig.1 Fig.1 Fig.2 Fig.1 Fig.1 Fig.1 Fig.3 Fig.4 Fig.5 Fig.5 Fig.5 Fig.1 Fig.6
BA178M!!T / BA178M!!FP series
Regulator ICs
(unless otherwise noted, Ta=25C, VIN=14V, IO=350mA)
Parameter Output voltage 1 Output voltage 2 Input stability 1 Input stability 2 Ripple rejection ratio Load regulation 1 Load regulation 2 Temperature coefficient of output voltage Output noise voltage Minimum I/O voltage differential Bias current Bias current change 1 Bias current change 2 Peak output current Output short-circuit current Symbol VO1 VO2 Reg.I1 Reg.I2 R.R. Reg.L1 Reg.L2 TCVO Vn Vd Ib Ib1 Ib2 IO-P IOS Min. 7.7 7.6 - - 56 - - - - - - - - - - Typ. 8.0 - 4 1 69 20 10 -0.5 80 2.0 4.5 - - 875 0.4 Max. 8.3 8.4 100 50 - 160 80 - - - 6.0 0.5 0.8 - - Unit V V mV mV dB mV mV V V mA mA mA mA A IO=350mA VIN=10.5~23V, IO=5~350mA VIN=10.5~25V, IO=200mA VIN=11~12V, IO=200mA eIN=1Vrms, f=120Hz, IO=100mA IO=5~500mA IO=5~200mA Conditions Measurement circuit Fig.1 Fig.1 Fig.1 Fig.1 Fig.2 Fig.1 Fig.1 Fig.1 Fig.3 Fig.4 Fig.5 Fig.5 Fig.5 Fig.1 Fig.6
mV/C IO=5mA, Tj=0~125C f=10Hz~100kHz IO=500mA IO=0mA IO=5~350mA VIN=10.5~25V, IO=200mA Tj=25C VIN=25V
(unless otherwise noted, Ta=25C, VIN=15V, IO=350mA)
Parameter Output voltage 1 Output voltage 2 Input stability 1 Input stability 2 Ripple rejection ratio Load regulation 1 Load regulation 2 Temperature coefficient of output voltage Output noise voltage Minimum I/O voltage differential Bias current Bias current change 1 Bias current change 2 Peak output current Output short-circuit current Symbol VO1 VO2 Reg.I1 Reg.I2 R.R. Reg.L1 Reg.L2 TCVO Vn Vd Ib Ib1 Ib2 IO-P IOS Min. 8.6 8.55 - - 56 - - - - - - - - - - Typ. 9.0 - 4 2 67 20 10 -0.5 90 2.0 4.5 - - 875 0.17 Max. 9.4 9.45 100 50 - 180 90 - - - 6.0 0.5 0.8 - - Unit V V mV mV dB mV mV V V mA mA mA mA A IO=350mA VIN=11.5~24V, IO=5~350mA VIN=11.5~26V, IO=200mA VIN=12~25V, IO=200mA eIN=1Vrms, f=120Hz, IO=100mA IO=5~500mA IO=5~200mA Conditions Measurement circuit Fig.1 Fig.1 Fig.1 Fig.1 Fig.2 Fig.1 Fig.1 Fig.1 Fig.3 Fig.4 Fig.5 Fig.5 Fig.5 Fig.1 Fig.6
mV/C IO=5mA, Tj=0~125C f=10Hz~100kHz IO=500mA IO=0mA IO=5~350mA VIN=12~25V, IO=200mA Tj=25C VIN=30V
BA178M!!T / BA178M!!FP series
Regulator ICs
(unless otherwise noted, Ta=25C, VIN=16V, IO=350mA)
Parameter Output voltage 1 Output voltage 2 Input stability 1 Input stability 2 Ripple rejection ratio Load regulation 1 Load regulation 2 Temperature coefficient of output voltage Output noise voltage Minimum I/O voltage differential Bias current Bias current change 1 Bias current change 2 Peak output current Output short-circuit current Symbol VO1 VO2 Reg.I1 Reg.I2 R.R. Reg.L1 Reg.L2 TCVO Vn Vd Ib Ib1 Ib2 IO-P IOS Min. 9.6 9.5 - - 56 - - - - - - - - - - Typ. 10.0 - 5 2 66 20 10 -0.5 100 2.0 4.5 - - 875 0.17 Max. 10.4 10.5 100 50 - 200 100 - - - 6.0 0.5 0.8 - - Unit V V mV mV dB mV mV mV/C V V mA mA mA mA A Conditions IO=350mA VIN=12.5~25V, IO=5~350mA VIN=12.5~28V, IO=200mA VIN=14~26V, IO=200mA eIN=1Vrms, f=120Hz, IO=100mA IO=5~500mA IO=5~200mA IO=5mA, Tj=0~125C f=10Hz~100kHz IO=500mA IO=0mA IO=5~350mA VIN=13~25V, IO=200mA Tj=25C VIN=30V Measurement circuit Fig.1 Fig.1 Fig.1 Fig.1 Fig.2 Fig.1 Fig.1 Fig.1 Fig.3 Fig.4 Fig.5 Fig.5 Fig.5 Fig.1 Fig.6
(unless otherwise noted, Ta=25C, VIN=19V, IO=350mA)
Parameter Output voltage 1 Output voltage 2 Input stability 1 Input stability 2 Ripple rejection ratio Load regulation 1 Load regulation 2 Temperature coefficient of output voltage Output noise voltage Minimum I/O voltage differential Bias current Bias current change 1 Bias current change 2 Peak output current Output short-circuit current Symbol VO1 VO2 Reg.I1 Reg.I2 R.R. Reg.L1 Reg.L2 TCVO Vn Vd Ib Ib1 Ib2 IO-P IOS Min. 11.5 11.4 - - 55 - - - - - - - - - - Typ. 12.0 - 5 3 63 20 10 -0.5 110 2.0 4.5 - - 875 0.17 Max. 12.5 12.6 100 50 - 240 120 - - - 6.0 0.5 0.8 - - Unit V V mV mV dB mV mV V V mA mA mA mA A IO=350mA VIN=15~27V, IO=5~350mA VIN=14.5~30V, IO=200mA VIN=16~30V, IO=200mA eIN=1Vrms, f=120Hz, IO=100mA IO=5~500mA IO=5~200mA Conditions Measurement circuit Fig.1 Fig.1 Fig.1 Fig.1 Fig.2 Fig.1 Fig.1 Fig.1 Fig.3 Fig.4 Fig.5 Fig.5 Fig.5 Fig.1 Fig.6
mV/C IO=5mA, Tj=0~125C f=10Hz~100kHz IO=500mA IO=0mA IO=5~350mA VIN=14.5~30V, IO=200mA Tj=25C VIN=30V
BA178M!!T / BA178M!!FP series
Regulator ICs
(unless otherwise noted, Ta=25C, VIN=23V, IO=350mA)
Parameter Output voltage 1 Output voltage 2 Input stability 1 Input stability 2 Ripple rejection ratio Load regulation 1 Load regulation 2 Temperature coefficient of output voltage Output noise voltage Minimum I/O voltage differential Bias current Bias current change 1 Bias current change 2 Peak output current Output short-circuit current Symbol VO1 VO2 Reg.I1 Reg.I2 R.R. Reg.L1 Reg.L2 TCVO Vn Vd Ib Ib1 Ib2 IO-P IOS Min. 14.4 14.25 - - 54 - - - - - - - - - - Typ. 15.0 - 6 3 60 20 10 -0.6 130 2.0 4.5 - - 875 0.17 Max. 15.6 15.75 100 50 - 300 150 - - - 6.0 0.5 0.8 - - Unit V V mV mV dB mV mV V V mA mA mA mA A IO=350mA VIN=17.5~30V, IO=5~350mA VIN=17.5~30V, IO=200mA VIN=20~30V, IO=200mA eIN=1Vrms, f=120Hz, IO=100mA IO=5~500mA IO=5~200mA Conditions Measurement circuit Fig.1 Fig.1 Fig.1 Fig.1 Fig.2 Fig.1 Fig.1 Fig.1 Fig.3 Fig.4 Fig.5 Fig.5 Fig.5 Fig.1 Fig.6
mV/C IO=5mA, Tj=0~125C f=10Hz~100kHz IO=500mA IO=0mA IO=5~350mA VIN=17.5~30V, IO=200mA Tj=25C VIN=30V
(unless otherwise noted, Ta=25C, VIN=27V, IO=350mA)
Parameter Output voltage 1 Output voltage 2 Input stability 1 Input stability 2 Ripple rejection ratio Load regulation 1 Load regulation 2 Temperature coefficient of output voltage Output noise voltage Minimum I/O voltage differential Bias current Bias current change 1 Bias current change 2 Peak output current Output short-circuit current Symbol VO1 VO2 Reg.I1 Reg.I2 R.R. Reg.L1 Reg.L2 TCVO Vn Vd Ib Ib1 Ib2 IO-P IOS Min. 17.3 17.1 - - 53 - - - - - - - - - - Typ. 18.0 - 7 3 58 20 10 -0.6 140 2.0 4.5 - - 875 0.17 Max. 18.7 18.9 100 50 - 360 180 - - - 6.0 0.5 0.8 - - Unit V V mV mV dB mV mV V V mA mA mA mA A IO=350mA VIN=21~33V, IO=5~350mA VIN=21~33V, IO=200mA VIN=24~33V, IO=200mA eIN=1Vrms, f=120Hz, IO=100mA IO=5~500mA IO=5~200mA Conditions Measurement circuit Fig.1 Fig.1 Fig.1 Fig.1 Fig.2 Fig.1 Fig.1 Fig.1 Fig.3 Fig.4 Fig.5 Fig.5 Fig.5 Fig.1 Fig.6
mV/C IO=5mA, Tj=0~125C f=10Hz~100kHz IO=500mA IO=0mA IO=5~350mA VIN=21~33V, IO=200mA Tj=25C VIN=30V
BA178M!!T / BA178M!!FP series
Regulator ICs
(unless otherwise noted, Ta=25C, VIN=29V, IO=350mA)
Parameter Output voltage 1 Output voltage 2 Input stability 1 Input stability 2 Ripple rejection ratio Load regulation 1 Load regulation 2 Temperature coefficient of output voltage Output noise voltage Mninimum I/O voltage differential Bias current Bias current change 1 Bias current change 2 Peak output current Output short-circuit current Symbol VO1 VO2 Reg.I1 Reg.I2 R.R. Reg.L1 Reg.L2 TCVO Vn Vd Ib Ib1 Ib2 IO-P IOS Min. 19.2 19.0 - - 53 - - - - - - - - - - Typ. 20.0 - 8 4 58 20 10 -0.7 150 2.0 4.5 - - 875 0.17 Max. 20.8 21.0 100 50 - 400 200 - - - 6.0 0.5 0.8 - - Unit V V mV mV dB mV mV V V mA mA mA mA A IO=350mA VIN=23~33V, IO=5~350mA VIN=23~33V, IO=200mA VIN=24~33V, IO=200mA eIN=1Vrms, f=120Hz, IO=100mA IO=5~500mA IO=5~200mA Conditions Measurement circuit Fig.1 Fig.1 Fig.1 Fig.1 Fig.2 Fig.1 Fig.1 Fig.1 Fig.3 Fig.4 Fig.5 Fig.5 Fig.5 Fig.1 Fig.6
mV/C IO=5mA, Tj=0~125C f=10Hz~100kHz IO=500mA IO=0mA IO=5~350mA VIN=23~33V, IO=200mA Tj=25C VIN=30V
(unless otherwise noted, Ta=25C, VIN=33V, IO=350mA)
Parameter Output voltage 1 Output voltage 2 Input stability 1 Input stability 2 Ripple rejection ratio Load regulation 1 Load regulation 2 Temperature coefficient of output voltage Output noise voltage Minimum I/O voltage differential Bias current Bias current change 1 Bias current change 2 Peak output current Output short-circuit current Symbol VO1 VO2 Reg.I1 Reg.I2 R.R. Reg.L1 Reg.L2 TCVO Vn Vd Ib Ib1 Ib2 IO-P IOS Min. 23.0 22.8 - - 50 - - - - - - - - - - Typ. 24.0 - 10 5 55 20 10 -0.7 170 2.0 4.8 - - 875 0.17 Max. 25.0 25.2 100 50 - 480 240 - - - 6.0 0.5 0.8 - - Unit V V mV mV dB mV mV V V mA mA mA mA A IO=350mA VIN=27~33V, IO=5~350mA VIN=27~33V, IO=200mA VIN=28~33V, IO=200mA eIN=1Vrms, f=120Hz, IO=100mA IO=5~500mA IO=5~200mA Conditions Measurement circuit Fig.1 Fig.1 Fig.1 Fig.1 Fig.2 Fig.1 Fig.1 Fig.1 Fig.3 Fig.4 Fig.5 Fig.5 Fig.5 Fig.1 Fig.6
mV/C IO=5mA, Tj=0~125C f=10Hz~100kHz IO=500mA IO=0mA IO=5~350mA VIN=27~33V, IO=200mA Tj=25C VIN=30V
BA178M!!T / BA178M!!FP series
Regulator ICs
"Measurement circuits
INPUT
0.33F
OUTPUT
0.1F V
V VIN
105W
VIN
COMMON
IO
INPUT
100F 0.33F
OUTPUT
0.1F eOUT
COMMON
V
IO
eIN=1Vrms f=120Hz Ripple rejection ratioR.R.=20 log
(
eIN eOUT
)
Fig. 1 Measurement circuit for output voltage, input stability, load regulation, temperature coefficient of output voltage
Fig. 2 Measurement circuit for ripple rejection ratio
INPUT
0.33F
OUTPUT
0.1 F
10F +
BPF 10Hz~ 100kHz Noise meter
V
INPUT
0.33F
VIN
COMMON
IO
OUTPUT
0.1F
VIN
COMMON
IO
500mA
V
V= 100mV
Fig. 3 Measurement circuit for output noise voltage
Fig. 4 Measurement circuit for Minimum I/O voltage differential
INPUT
0.33 F
OUTPUT
0.1 F 0.33F V
INPUT VIN
OUTPUT
0.1F
VIN
COMMON
IO
COMMON
IO A
A
Fig. 5 Measurement circuit for bias current and bias current change
Fig. 6 Measurement circuit for Fig. 10output short-circuit current
"Electrical characteristic curves
10 VIN=10V BA178M05T 8
6
25
OUTPUT VOLTAGE : VOUT (V)
5 4 3
POWER DISSIPATION : Pd (W)
VIN=10V, IOUT=0 BA178M05T
(1) 22.0
OUTPUT VOLTAGE : VOUT (V)
20
(1) Infinite heat sink, j-c = 5.7 (C / W) (2) 100x100x2 (mm3), with Al heat sink (3) 50x50x2 (mm3), with Al heat sink (4) No heat sink j-a = 62.5 (C / W)
6
15
(2) 11.0
4
10
(3) 6.5
2
2
1 0
5
(4) 2.0
0
0.2
0.4
0.6
0.8
1.0
25
50
75
100
125
150
175
200
0
25
50
75
100
125
150
OUTPUT CURRENT : IOUT (A)
JUNCTION TEMPERATURE : Tj (C)
AMBIENT TEMPERATURE : Ta (C)
Fig. 7 Current limit characteristics
Fig. 8 Thermal cutoff circuit characteristics
Fig.9 Thermal derating characteristic (TO220FP)
BA178M!!T / BA178M!!FP series
Regulator ICs
12.5
POWER DISSIPATION : Pd (W)
(1) 10.0
(1) Infinite heat sink, j-c=12.5 (C / W) (2) No heat sink j-c=125.0 (C /W)
10
7.5
5
2.5
(2) 1.0
0 0
25
50
75
100
125
150
AMBIENT TEMPERATURE : Ta (C)
Fig.10 Thermal derating characteristic (TO252-3)
"Operation notes (1) Although the circuit examples included in this handbook are highly recommendable for general use, you should thoroughly familiar yourself with the circuit characteristics as they relate to your own conditions. If you intend to change the number of external circuits, leave an ample margin, taking into account discrepancies in both static and dynamic characteristics of external parts and Rohm ICs. In addition, please be advised that Rohm cannot provide complete assurance regarding patent rights. (2) Operating power supply voltage When operating within the normal voltage range and within the ambient operating temperature range, most circuit functions are guaranteed. The rated values cannot be guaranteed for the electrical characteristics, but there are no sudden changes of the characteristics within these ranges. (3) Power dissipation Heat attenuation characteristics are noted on a separate page and can be used as a guide in judging power dissipation. If these ICs are used in such in a way that the allowable power dissipation level is exceeded, an increase in the chip temperature could cause a reduction in the current capability or could otherwise adversely affect the performance of the IC. Make sure a sufficient margin is allowed so that the allowable power dissipation value is not exceeded. (4) Preventing oscillation in output and using bypass capacitors Always use a capacitor between the output pins and the GND to prevent fluctuation in the output and to prevent oscillation between the output pins and the GND of the application's input (VIN F should be used.) Changes in the temperature and other factors can cause the value of the capacitor to change, and this can cause oscillation. To prevent this, we recommend using a tantalum capacitor which has minimal changes in nominal capacitance. Also, we recommend adding a bypass capacitor of about 0.33F between the input pin and the GND, as close to the pin as possible. (5) Thermal overload circuit A built-in thermal overload circuit prevents damage from overheating. When the thermal circuit is activated, the various outputs are in the OFF state. When the temperature drops back to a constant level, the circuit is restored. (6) Internal circuits could be damaged if there are modes in which the electric potential of the application's input (VIN) and GND are the opposite of the electric potential of the various outputs. Use of a diode or other such bypass path is recommended. (7) Although the manufacture of this product includes rigorous quality assurance procedures, the product may be damaged if absolute maximum ratings for voltage or operating temperature are exceeded. If damage has occurred, special modes (such as short circuit mode or open circuit mode) cannot be specified. If it is possible that such special modes may be needed, please consider using a fuse or some other mechanical safety measure. (8) When used within a strong magnetic field, be aware that there is a slight possibility of malfunction.
BA178M!!T / BA178M!!FP series
Regulator ICs
"External dimensions (Units : mm)
BA178MOOT series
10.0 +0.3 -0.1 7.0 +0.3 -0.1 3.10.1 4.5 +0.3 -0.1 2.8 +0.2 -0.1 6.50.2 5.0 +0.2 -0.1 (2) 2.30.2 0.50.1
BA178MOOFP series
17.0 +0.4 -0.2
12.00.2
8.00.2
1.80.2
7.00.3
5.50.2
5.00.2
13.5Min.
0.8
0.8 2.540.5
(1) (2) (3) (1) (2) (3)
0.65 2.30.2 0.55 +0.1 -0.05 (1) 2.60.5
0.65 2.30.2 (3) 0.50.1
2.540.5
(1) INPUT (2) COMMON (3) OUTPUT
(1) INPUT (2) COMMON (3) OUTPUT
TO220FP
TO252-3
1.5 2.5
1.3
9.50.5

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