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BA178!!T / FP series
Regulator ICs
Standard 78 series, 3-pin regulator
BA178!! / FP series !!T !!
The BA178!!T and BA178!!FP series are 3pin 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 1A 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 TO220FP 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, 24V).
"Product codes
Output voltage (V) 5 6 7 8 9 10 Product name BA17805T / FP BA17806T / FP BA17807T / FP BA17808T / FP BA17809T / FP BA17810T / FP Output voltage (V) 12 15 18 20 24 - Product name BA17812T / FP BA17815T / FP BA17818T / FP BA17820T / FP BA17824T / FP -
BA178!!T / 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 R18 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 BA178!!T / FP seriesp
Parameter Applied voltage Power dissipation TO220FP TO252-3 Symbol VIN Pd Topr Tstg Limits 35 2.0 1.0 -40+85 -55+150 Unit V W C C
Operating temperature Storage temperature
Reduced by 16 mW / C (TO220FP) and 8 mW / C (TO252-3) for each increase in Ta of 1C over 25C (without heat sink).
"Recommended operating conditions (Ta=25C)
BA17805T / FP Parameter
Input voltage Output current
BA17806T / FP Symbol VIN IO Min. 7.5 - Typ. - - Max. 25 1 Unit V A Parameter
Input voltage Output current
Symbol VIN IO
Min. 8.5 -
Typ. - -
Max. 21 1
Unit V A
BA17807T / FP Parameter
Input voltage Output current
BA17808T / FP Symbol VIN IO Min. 9.5 - Typ. - - Max. 22 1 Unit V A Parameter
Input voltage Output current
Symbol VIN IO
Min. 10.5 -
Typ. - -
Max. 23 1
Unit V A
BA178!!T / FP series
Regulator ICs
BA17809T / FP Parameter
Input voltage Output current
BA17810T / FP Symbol VIN IO Min. 11.5 - Typ. - - Max. 26 1 Unit V A Parameter
Input voltage Output current
Symbol VIN IO
Min. 12.5 -
Typ. - -
Max. 25 1
Unit V A
BA17812T / FP Parameter
Input voltage Output current
BA17815T / FP Symbol VIN IO Min. 15 - Typ. - - Max. 27 1 Unit V A Parameter
Input voltage Output current
Symbol VIN IO
Min. 17.5 -
Typ. - -
Max. 30 1
Unit V A
BA17818T / FP Parameter
Input voltage Output current
BA17820T / FP Symbol VIN IO Min. 21 - Typ. - - Max. 33 1 Unit V A Parameter
Input voltage Output current
Symbol VIN IO
Min. 23 -
Typ. - -
Max. 33 1
Unit V A
BA17824T / FP Parameter
Input voltage Output current
Symbol VIN IO
Min. 27 -
Typ. - -
Max. 33 1
Unit V A
"Electrical characteristics (unless otherwise noted, Ta=25C, VIN=10V, IO=500mA)
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 15 5 -1.0 40 2.0 4.5 - - 1.7 0.6
Max. 5.2 5.25 100 50 - 100 50 - - - 8.0 0.5 0.8 - -
Unit V V mV mV dB mV mV V V mA mA mA A A IO=500mA
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
VIN=7.520V, IO=5mA1A VIN=725V, IO=500mA VIN=812V, IO=500mA eIN=1Vrms, f=120Hz, IO =100mA IO=5mA1A IO=250750mA
mV/C IO=5mA, Tj =0125C f=10Hz100kHz IO=1A IO=0mA IO=5mA1A VIN=825V Tj=25C VIN=25V
BA178!!T / FP series
Regulator ICs
(unless otherwise noted, Ta=25C, VIN=11V, IO=500mA)
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 - - 59 - - - - - - - - - -
Typ. 6.0 - 4 2 73 16 6 -0.5 60 2.0 4.5 - - 1.7 0.6
Max. 6.25 6.3 120 60 - 120 60 - - - 8.0 0.5 0.8 - -
Unit V V mV mV dB mV mV V V mA mA mA A A IO=500mA
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
VIN=8.521V, IO=5mA1A VIN=825V, IO=500mA VIN=913V, IO=500mA eIN=1Vrms, f=120Hz, IO=100mA IO=5mA1A IO=250750mA
mV/C IO=5mA, Tj=0125C f=10Hz100kHz IO=1A IO=0mA IO=5mA1A VIN=8.525V Tj=25C VIN=25V
(unless otherwise noted, Ta=25C, VIN=13V, IO=500mA)
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 - 5 2 69 17 6 -0.5 70 2.0 4.5 - - 1.7 0.6
Max. 7.3 7.35 140 70 - 140 70 - - - 8.5 0.5 0.8 - -
Unit V V mV mV dB mV mV V V mA mA mA A A IO=500mA
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
VIN=9.522V, IO=5mA1A VIN=925V, IO=500mA VIN=1015V, IO=500mA eIN=1Vrms, f=120Hz, IO=100mA IO=5mA1A IO=250750mA
mV/C IO=5mA, Tj=0125C f=10Hz100kHz IO=1A IO=0mA IO=5mA1A VIN=9.525V Tj=25C VIN=25V
BA178!!T / FP series
Regulator ICs
(unless otherwise noted, Ta=25C, VIN=14V, IO=500mA)
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 Min. VO1 VO2 Reg.I1 Reg.I2 R.R. Reg.L1 Reg.L2 TCVO Vn Vd Ib Ib1 Ib2 IO-P IOS 7.7 7.6 - - 56 - - - - - - - - - -
Typ. 8.0 - 5 3 65 19 7 -0.5 80 2.0 4.5 - - 1.7 0.6
Max. 8.3 8.4 160 80 - 160 80 - - - 8.0 0.5 0.8 - -
Unit V V mV mV dB mV mV V V mA mA mA A A IO=500mA
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
VIN=10.523V, IO=5mA1A VIN=10.525V, IO=500mA VIN=1117V, IO=500mA eIN=1Vrms, f=120Hz, IO=100mA IO=5mA1A IO=250750mA
mV/C IO=5mA, Tj=0125C f=10Hz100kHz IO=1A IO=0mA IO=5mA1A VIN=10.525V Tj=25C VIN=25V
(unless otherwise noted, Ta=25C, VIN=15V, IO=500mA)
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 diffrential 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 - 6 4 64 20 8 -0.5 90 2.0 4.5 - - 1.7 0.3
Max. 9.4 9.45 180 90 - 180 90 - - - 8.0 0.5 0.8 - -
Unit V V mV mV dB mV mV V V mA mA mA A A IO=500mA
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
VIN=11.526V, IO=5mA1A VIN=11.526V, IO=500mA VIN=1319V, IO=500mA eIN=1Vrms, f=120Hz, IO =100mA IO=5mA1A IO=250750mA
mV/C IO=5mA, T j =0125C f=10Hz100kHz IO=1A IO=0mA IO=5mA1A VIN=11.526V Tj=25C VIN=30V
BA178!!T / FP series
Regulator ICs
(unless otherwise noted, Ta=25C, VIN=16V, IO=500mA)
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 - - 55 - - - - - - - - - -
Typ. 10.0 - 7 4 64 21 8 -0.5 100 2.0 4.5 - - 1.7 0.3
Max. 10.4 10.5 200 100 - 200 90 - - - 8.0 0.5 0.8 - -
Unit V V mV mV dB mV mV V V mA mA mA A A IO=500mA
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
VIN=12.525V, IO=5mA1A VIN=12.527V, IO=500mA VIN=1420V, IO=500mA eIN=1Vrms, f=120Hz, IO =100mA IO=5mA1A IO=250750mA
mV/C IO=5mA, Tj =0125C f=10Hz100kHz IO=1A IO=0mA IO=5mA1A VIN=12.527V Tj=25C VIN=30V
(unless otherwise noted, Ta=25C, VIN=19V, IO=500mA)
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 - 8 5 63 23 10 -0.5 110 2.0 4.5 - - 1.7 0.3
Max. 12.5 12.6 240 120 - 240 120 - - - 8.0 0.5 0.8 - -
Unit V V mV mV dB mV mV V V mA mA mA A A IO=500mA
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
VIN=1527V, IO=5mA1A VIN=14.530V, IO=500mA VIN=1622V, IO=500mA eIN=1Vrms, f=120Hz, IO =100mA IO=5mA1A IO=250750mA
mV/C IO=5mA, Tj =0125C f=10Hz100kHz IO=1A IO=0mA IO=5mA1A VIN=14.530V Tj=25C VIN=30V
BA178!!T / FP series
Regulator ICs
(unless otherwise noted, Ta=25C, VIN=23V, IO=500mA)
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 - 9 5 62 27 10 -0.6 125 2.0 4.5 - - 1.7 0.3
Max. 15.6 15.75 300 150 - 300 150 - - - 8.0 0.5 0.8 - -
Unit V V mV mV dB mV mV V V mA mA mA A A IO=500mA
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
VIN=17.530V, IO=5mA1A VIN=17.530V, IO=500mA VIN=2026V, IO=500mA eIN=1Vrms , f=120Hz, IO=100mA IO=5mA1A IO=250750mA
mV/C IO=5mA, Tj=0125C f=10Hz100kHz IO=1A IO=0mA IO=5mA1A VIN=17.530V Tj =25C VIN=30V
(unless otherwise noted, Ta=25C, VIN=27V, IO=500mA)
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 - - 55 - - - - - - - - - -
Typ. 18.0 - 10 5 61 30 12 -0.6 140 2.0 4.5 - - 1.7 0.3
Max. 18.7 18.9 360 180 - 360 180 - - - 8.0 0.5 0.8 - -
Unit V V mV mV dB mV mV V V mA mA mA A A IO=500mA
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
VIN=2133V, IO =5mA1A VIN=2133V, IO =500mA VIN=2433V, IO =500mA eIN=1Vrms, f=120Hz, IO =100mA IO=5mA1A IO=250750mA
mV/C IO=5mA, Tj=0125C f=10Hz100kHz IO=1A IO=0mA IO=5mA1A VIN=2133V Tj=25C VIN=30V
BA178!!T / FP series
Regulator ICs
(unless otherwise noted, Ta=25C, VIN=29V, IO=500mA)
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. 19.2 19.0 - - 53 - - - - - - - - - -
Typ. 20.0 - 12 7 60 32 14 -0.7 150 2.0 4.5 - - 1.7 0.3
Max. 20.8 21.0 400 200 - 400 200 - - - 8.0 0.5 0.8 - -
Unit V V mV mV dB mV mV V V mA mA mA A A IO=500mA
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
VIN=2333V, IO =5mA1A VIN=2333V, IO =500mA VIN=2632V, IO =500mA eIN=1Vrms, f=120Hz, IO=100mA IO=5mA1A IO=250750mA
mV/C IO=5mA, Tj =0125C f=10Hz100kHz IO=1A IO=0mA IO=5mA1A VIN=2333V Tj=25C VIN=30V
(unless otherwise noted, Ta=25C, VIN=33V, IO=500mA)
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 - 15 10 58 37 15 -0.7 180 2.0 4.7 - - 1.7 0.3
Max. 25.0 25.2 480 240 - 480 240 - - - 8.0 0.5 0.8 - -
Unit V V mV mV dB mV mV V V mA mA mA A A IO=500mA
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
VIN=2733V, IO =5mA1A VIN=2733V, IO =500mA VIN=3033V, IO =500mA eIN=1Vrms, f=120Hz, IO=100mA IO=5mA1A IO=250750mA
mV/C IO=5mA, Tj =0125C f=10Hz100kHz IO=1A IO=0mA IO=5mA1A VIN=2733V Tj =25C VIN=30V
BA178!!T / FP series
Regulator ICs
"Measurement circuits
V ~
INPUT OUTPUT 0.1F COMMON IO
eIN
105W
0.33F
INPUT 100F 0.33F
OUTPUT 0.1F
eOUT V ~
IO
VIN
V
VIN
COMMON
eIN=1Vrms
f=120Hz
Ripple rejection ratio R.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 rario
V
10F INPUT 0.33F VIN COMMON OUTPUT 0.1 F IO
+
BPF 10Hz 100kHz
0.33F
Noise meter
INPUT VIN
OUTPUT 0.1F
COMMON
IO IA
V 100mA
V=
Fig. 3 Measurement circuit for output noise voltage
Fig. 4 Measurement circuit for Minimum I / O voltage differential
INPUT 0.33 F VIN
OUTPUT 0.1 F 0.33 F IO VIN
INPUT
OUTPUT 0.1 F IO A
COMMON
COMMON
A
Fig. 5 Measurement circuit for bias current and bias current change
Fig. 6 Measurement circuit for Fig. 1 output short-circuit current
"Electrical characteristic curves
10 VIN=10V BA17805T
OUTPUT VOLTAGE : VOUT (V)
6
25
POWER DISSIPATION : Pd (W)
VIN=10V, IOUT=0 BA17805T
(1) 22.0
8
OUTPUT VOLTAGE : VOUT (V)
5 4 3
20
6
15
(2) 11.0
(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) Note: With Al heat sink, tightening torque = 6 kg/cm and silicon grease as lubricant
4
10
(3) 6.5
2
2
1 0
5
(4) 2.0
0 1.0
1.2
1.4
1.6
1.8
2.0
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 Fig. 2 characteristics
Fig.9 Ta - power dissipation characteristics (TO220)
BA178!!T / FP series
Regulator ICs
12.5
POWER DISSIPATION : Pd (W)
(1) 10.0
10
(1) Infinite heat sink, j-c = 12.5 (C/W) (2) No heat sink j-c = 125.0 (C/W)
7.5
5
2.5
(2) 1.0
0 0
25
50
75
100
125
150
AMBIENT TEMPERATURE : Ta (C)
Fig.10 Ta - power dissipation Fig.3 characteristics (TO252-3)
"Operation notes (1) Although the circuit examples included in this handbook are highly recommendable for general use, you should be thoroughly familiar with circuit characteristics as they relate to your own use 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 can not 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 0.1F 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, it may be be damaged if absolute maximum ratings for voltage or operating temperature are exceeded. When 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.
BA178!!T / FP series
Regulator ICs
"External dimensions (Units : mm)
BA178OOT series
10.0
+0.3 -0.1
BA178OOFP series
4.5 3.10.1
+0.3 -0.1
1.80.2
7.0 +0.3 -0.1
2.8 +0.2 -0.1 6.50.2 +0.2 5.0 -0.1 (2) 2.30.2 0.50.1
17.0 +0.4 -0.2
12.00.2
5.00.2 8.00.2
7.00.3
5.50.2
13.5Min.
0.8 2.540.5 (1) (2) (3) 2.540.5 0.55 +0.1 -0.05 2.60.5
0.65 2.30.2 (1)
0.65 2.30.2 (3) 0.50.1
(1) (2) (3)
(1) INPUT (2) COMMON (3) OUTPUT
(1) INPUT (2) COMMON (3) OUTPUT
TO220FP
TO252-3
1.5 2.5
1.3
0.8
9.50.5

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