BD3941T Datasheet PDF - Rohm


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BD3941T
Rohm

Part Number BD3941T
Description LDO Regulator
Page 9 Pages

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TECHNICAL NOTE
Power Management LSI Series for Automotive Body Control
High temperature
operating
LDO Regulator
Now available
BD3940FP, BD3941FP/HFP/T
zDescription
BD394FP Series regulators feature a high 36 V breakdown voltage and are compatible with onboard vehicle microcontrollers. They offer
an output current of 500 mA while limiting dark current to 30 µA (TYP). The series supports the use of ceramic capacitors as output phase
compensation capacitors. Since the ICs use P-channel DMOS output transistors, increased loads do not result in increased total supply
current. BD394FP Series is ideal for lowering current consumption and costs in battery direct-coupled systems.
zFeatures
1) Super-low dark current: 30 µA (Typ.)
2) Low-saturation voltage type P-channel DMOS output transistors
Output on resistance: 1.6 (Typ.)
3) High precision output voltage: 5 V ±2% (Ta = 25°C) / Iomax = 500 mA
4) Low-ESR ceramic capacitors can be used as output capacitors
5) Vcc power supply voltage = 36 V / Peak power supply voltage = 50 V (tr 1 ms, tH 200 ms)
6) Built-in over current protection circuit and thermal shutdown circuit
7) TO252-3/HRP-5/TO220FP-3 package
zApplications
Vehicle equipment, car stereos, satellite navigation systems, etc.
zProduct line
Model
Output voltage
BD3940FP
3.3 V
BD3941FP/HFP/T
5.0 V
zAbsolute maximum ratings (Ta = 25°C)
Parameter
Symbol
Limit
Unit
Power supply voltage
Vcc
36*1
V
Output current
Io 500 mA
1.2*2
Power dissipation
Pd
1.6*3
W
2.0*4
Operating temperature range
Topr
40 to +125
°C
Storage temperature range
Tstg
55 to +150
°C
Peak power supply voltage
Vcc Peak
50*5
V
Maximum junction temperature
Tjmax
150 °C
* 1Not to exceed Pd.
*2 For TO252-3, reduced by 9.6 mW/°C over 25°C, when mounted on a glass epoxy board (70 mm × 70 mm × 1.6 mm).
*3 Reduced by 12.8 mW/°C over 25°C, when mounted on a glass epoxy board (70 mm × 70 mm × 1.6 mm).
*4 For TO220FP-3, reduced by 16.0 mW/°C over 25°C.
*5 Application time 200 ms or shorter. (tr 1 ms)
Ver.B Oct2005



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zRecommended operating conditions (Ta = 25°C)
Parameter
Symbol
Input voltage
BD3940FP/HFP
BD3941FP/HFP/T
Vcc
Vcc
Output current
Io
Min.
4.5
6.2
Max.
25.0
25.0
500
Unit
V
V
mA
zElectrical characteristics (Unless otherwise specified, Ta = 25°C; Vcc = 13.2 V; Io = 200 mA)
Parameter
Symbol
Min.
Limit
Typ.
Max.
Unit
Bias current 1
Ib1 — 30 40 µA
Bias current 2
Ib2 — 30 — µA
Output voltage
BD3940FP
BD3941FP/HFP/T
Vo 3.234 3.300 3.366 V
Vo 4.900 5.000 5.100 V
Output current
Io
500 —
— mA
Minimum I/O voltage
difference
BD3940FP
BD3941FP/HFP/T
Vd
— 0.45 0.65
V
Ripple rejection
R.R. 45 55 — dB
Input stability
Load stability
BD3940FP
Reg.I
10
30 mV
BD3941FP/HFP/T
Reg.L
20
60 mV
Conditions
Io = 0 mA
Io = 200 mA
Vcc = 3.135 V, Io = 100 A
Vcc = 4.75 V, Io = 200 A
f = 120 Hz, ein = 1 Vrms,
Io = 100 mA
Vcc = 4.5 V 25 V
Vcc = 6.2 V 25 V
Io = 0 mA 200 mA
zElectrical characteristics (Unless otherwise specified, Ta = 40°C to +125°C; Vcc = 13.2 V; Io = 200 mA)
Parameter
Symbol
Min.
Limit
Typ.
Max.
Unit
Conditions
Bias current 1
Ib1 — 30 40 µA Io = 0 mA
Bias current 2
Ib2 — 30 — µA Io = 200 mA
Output voltage
BD3940FP
BD3941FP/HFP/T
Vo 3.168 3.300 3.366 V
Vo 4.800 5.000 5.100 V
Output current
Io 500 — — mA
Minimum I/O voltage BD3940FP
difference
BD3941FP/HFP/T
Vd
— 0.9
Vcc = 3.135 V, Io = 100 A
V
Vcc = 4.75 V, Io = 200 A
Ripple rejection
R.R.
45
55
dB
f = 120 Hz, ein = 1 Vrms,
Io = 100 mA
Input stability
BD3940FP
Vcc = 4.5 V 25 V
Reg.
10
45 mV
BD3941FP/HFP/T
Vcc = 6.2 V 25 V
Load stability
Reg.L
20
60 mV Io = 0 mA 200 mA
Note: This IC is not designed to be radiation-resistant.
Note: All characteristics are measured with 0.33 µF and 0.1 µF capacitors connected to input and output pins, respectively.
Because measurements (pulse measurements) were taken when Ta Tj, data other than the output voltage/temperature coefficient
does not include fluctuations due to temperature variations.
2/8



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zReference data (Unless otherwise specified, Ta = 25°C)
50
40
30
20
10
0
0 5 10 15 20 25
SUPPLY VOLTAGE: Vcc [V]
Fig. 1 Total Supply Current
1
0.8
0.6
0.4
0.2
0
0 100 200 300 400 500
OUTPUT CURRENT: Io [mA]
Fig. 4 I/O Voltage Difference
6
5
4
3 Ta = 40°C
Ta = 25°C
2
Ta = 125°C
1
0
0 5 10 15 20 25
SUPPLY VOLTAGE: Vcc [V]
Fig. 2 Output Voltage vs Power
Supply Voltage
70
60
50
40
30
20
10
0
10 100 1000 10000 100000 1E+06
FREQUENCY: f [Hz]
Fig. 5 Ripple Rejection
6
Ta = 40°C
5
4 Ta = 25°C
3
Ta = 125°C
2
1
0
0 500 1000 1500 2000
OUTPUT CURRENT: Io [mA]
Fig. 3 Output Voltage vs Load
6
5
4
Ta = 125°C
3
2
Ta = 25°C
Ta = 40°C
1
0
20 25 30 35 40
SUPPLY VOLTAGE: Vcc [V]
Fig. 6 Overvoltage Protection
0.2
0.15
0.1
0.05
0
0 100 200 300 400 500
OUTPUT CURRENT: Io [mA]
Fig. 7 Total Supply Current
Classified by Load
65
60
55
50
45
-40 0 40 80 120
AMBIENT TEMPERATURE: Ta []
Fig. 10 Ripple Rejection vs
Temperature
6
5
4
3
2
1
0
100 120 140 160 180 200
AMBIENT TEMPERATURE: Ta []
Fig. 8 Thermal Shutdown Circuit
0.6
0.5
0.4
0.3
0.2
0.1
0
-40 0 40 80 120
AMBIENT TEMPERATURE: Ta []
Fig. 11 Min. I/O Voltage Differential vs
Temperature
5.5
5.25
5
4.75
4.5
-40
0
40 80 120
AMBIENT TEMPERATURE: Ta []
Fig. 9 Output Voltage vs
Temperature
50
40
30
20
10
0
-40 0 40 80 120
AMBIENT TEMPERATURE: Ta []
Fig. 12 Total Supply Current vs
Temperature
3/8



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zBlock diagram
Vcc
1
Cin
Vref
GND
Fin
OCP
OVP
TSD
2
N.C
Fig.13 TO252-3
Vcc
1
Cin
Vo
3
Co
GND
3
Fin
Vref
OCP
OVP
TSD
24
N.C N.C
.
Fig.14 HRP5
Cin : 0.33 µF to 1000 µF
Co : 0.1 µF to 1000 µF
Vcc
1
Cin
Vo
5
Co
GND
2
Vref
OCP
OVP
TSD
Vo
3
Co
Fig.15 TO220FP-3
zPin assignments
TO252-3
FIN
1 23
Fig.16
Pin No.
1
2
3
Fin
Pin No.
Vcc
N.C.
Vo
GND
Function
Power supply pin
NC pin
Voltage output pin
Ground pin
HRP5
FIN
1 2 345
Fig.17
Pin No.
1
2
3
4
5
Fin
Pin No.
Vcc
N.C.
GND
N.C.
Vo
GND
Function
Power supply pin
NC pin
Ground pin
NC pin
Voltage output pin
Ground pin
TO220FP-3
1 23
Fig.18
Pin No.
1
2
3
Pin No.
Vcc
GND
Vo
Function
Power supply pin
Ground pin
Voltage output pin
4/8




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