TECHNICAL NOTE
Power Management LSI Series for Automotive Body Control
High temperature
operating
LDO Regulator
Now available
BD3940FP, BD3941FP/HFP/T
Description
BD394□FP 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. BD394□FP Series is ideal for lowering current consumption and costs in battery direct-coupled systems.
Features
1) Super-low dark current: 30 µA (Typ.)
2) Low-saturation voltage type P-channel DMOS output transistors
Output on resistance: 1.6 Ω (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
Applications
Vehicle equipment, car stereos, satellite navigation systems, etc.
Product line
Model
Output voltage
BD3940FP
BD3941FP/HFP/T
3.3 V
5.0 V
Absolute maximum ratings (Ta = 25°C)
Parameter
Power supply voltage
Output current
Symbol
Limit
Vcc
36*1
Unit
V
Io
500
mA
1.2*2
Power dissipation
Pd
1.6*3
2.0
W
*4
Operating temperature range
Topr
−40 to +125
°C
Storage temperature range
Tstg
−55 to +150
°C
Vcc Peak
50*5
V
Tjmax
150
°C
Peak power supply voltage
Maximum junction temperature
* 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
Reference data (Unless otherwise specified, Ta = 25°C)
6
6
40
30
20
10
OUTPUT VOLTAGE: Vo [V]
Ta = −40°C
OUTPUT VOLTAGE: Vo [V]
CIRCUIT CURRENT: Icc [µA]
50
5
4
Ta = −40°C
3
Ta = 25°C
2
Ta = 125°C
1
0
5
10
15
20
0
25
5
10
15
20
SUPPLY VOLTAGE: Vｃｃ [V]
1
500
0.6
0.4
0.2
200
300
400
60
50
40
30
20
10
Fig. 4 I/O Voltage Difference
100
1000
0.05
0
400
30
35
40
3
2
1
120
140
160
180
5.25
5
4.75
4.5
-40
200
0
40
80
120
AMBIENT TEMPERATURE: Ta [℃]
AMBIENT TEMPERATURE: Ta [ ℃]
Fig. 8 Thermal Shutdown Circuit
Fig. 9 Output Voltage vs
Temperature
50
60
55
50
CIRCUIT CURRENT: Icc [µA]
DROPOUT VOLTAGE: ∆Vd [V]
0.6
0.5
0.4
0.3
0.2
0.1
0
45
120
AMBIENT TEMPERATURE: Ta [℃]
Fig. 10 Ripple Rejection vs
Temperature
25
5.5
0
100
500
65
80
1
Fig. 6 Overvoltage Protection
4
Fig. 7 Total Supply Current
Classified by Load
40
2
SUPPLY VOLTAGE: Vcc [V]
5
OUTPUT CURRENT: Io [mA]
0
Ta = −40°C
20
OUTPUT VOLTAGE: Vo [V]
OUTPUT VOLTAGE: Vo [V]
0.1
300
Ta = 125°C
3
Fig. 5 Ripple Rejection
0.15
200
Ta = 25°C
4
10000 100000 1E+06
6
100
5
FREQUENCY: f [Hz]
0.2
2000
0
10
500
1500
Fig. 3 Output Voltage vs Load
0
100
1000
OUTPUT CURRENT: Io [mA]
6
OUTPUT CURRENT: Io [mA]
CIRCUIT CURRENT: Icc [mA]
Ta = 125°C
0
OUTPUT VOLTAGE: Vo [V]
RIPPLE REJECTION: R.R. [dB]
DROPOUT VOLTAGE: ∆Vd [V]
0.8
0
RIPPLE REJECTION: R.R. [dB]
2
25
70
-40
3
Fig. 2 Output Voltage vs Power
Supply Voltage
1
0
Ta = 25°C
SUPPLY VOLTAGE: Vｃｃ [V]
Fig. 1 Total Supply Current
0
4
0
0
0
5
40
30
20
10
0
-40
0
40
80
120
AMBIENT TEMPERATURE: Ta [℃]
Fig. 11 Min. I/O Voltage Differential vs
Temperature
3/8
-40
0
40
80
120
AMBIENT TEMPERATURE: Ta [℃]
Fig. 12 Total Supply Current vs
Temperature
