TECHNICAL NOTE
Power Management LSI Series for Automotive Body Control
Regulators with
Voltage Detector and
Watchdog Timer
BD3004HFP,BD3005HFP
Description
The BD3004HFP,BD3005HFP low bias current regulator and watchdog timer features a high 50 V breakdown voltage and is compatible
with on-board vehicle microcontrollers. It offers an output current of 500 mA while limiting bias current to 80
µA
(Typ.). The series supports
the use of ceramic capacitors as output phase compensation capacitors.The reset detection voltage can be changed by connecting a
resistor to the Vs pin.（BD3004HFP）The watchdog timer can be switched on and off using the INH pin input logic.（BD3005HFP）
Features
1) 5 V/500 mA regulators for microcontrollers
BD3004HFP: Adjustable detection voltage (Vs pin)
2) Super-low bias current: 80
µA
(Typ.)
BD3005HFP:Built-in watchdog timer reset circuit (INH pin: watchdog timer on/off)
3) Low-saturation voltage type P-channel DMOS output transistors
4) High precision output voltage: 5 V
±2%
6) Vcc Maximum applied voltage: 50 V
5) Low-ESR ceramic capacitors can be used as output capacitors
7) Built-in overcurrent protection circuit and thermal shutdown circuit
8) Built-in reverse connection breakdown prevention circuit
10) HRP7 package
9) Back current flow protection during sudden battery failures, making it a highly reliable 5 V regulator.
Applications
Onboard devices (Vehicle equipment, Car stereos, Satellite navigation systems, etc.)
Absolute maximum ratings
(Ta = 25°C)
Parameter
Vcc applied voltage
ot
Vs pin voltage(BD3004HFP)
INH pin voltage(BD3005HFP)
Regulator output pin voltage
Reset output pin voltage
Watchdog input pin voltage
N
Reset delay setting pin voltage
Output current
Power dissipation
Operating temperature range
Storage temperature range
Maximum junction temperature
*1 Must not exceed Pd.
*2 Reduced by 12.8 mW/°C over 25°C, when mounted on a glass epoxy board (70 mm
×
70 mm
×
1.6 mm).
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Symbol
Vcc
Vs
Limit
Unit
V
−15
to +50
*1
−0.3
to +15
V
VINH
−0.3
to +15
−0.3
to +15
−0.3
to +15
−0.3
to +15
−0.3
to +15
500
1.6
*2
−40
to +125
−55
to +150
150
V
V
V
V
V
mA
W
°C
°C
°C
VOUT
VRO
VCLK
VCT
IOUT
Pd
Topr
Tstg
Tjmax
R
Ver.B July 2006
Operating power supply voltage range
(Ta = 25°C)
Parameter
Operating power supply voltage range
Output current
*
**
Must not exceed Pd.
Min.
5.5*
－
Max.
36**
500
Unit
V
mA
For the output voltage, consider the voltage drop (min. I/O voltage differential) due to the output current.
Electrical Characteristics
(Unless otherwise specified, Ta =
−40°C
to 125°C, Vcc = 13.5 V)
Parameter
[Overall]
Symbol
Min.
Limit
Typ.
Max.
Unit
Conditions
Total supply current 1
Total supply current 2
Total supply current 3(BD3005HFP)
[Regulator]
Output voltage
Input stability
Load stability
Min. I/O voltage differential
Output current
Ripple rejection
[Reset]
Detection voltage(BD3004HFP)
Detection voltage(BD3005HFP)
Hysteresis width
Output delay time Low
→
High
Low output voltage
Min. operating voltage
[Watchdog timer]
High-side switching threshold voltage
Low-side switching threshold voltage
Discharge current
Charge current
Watchdog monitor time
Watchdog reset time
Clock input pulse width
[INH]
ot
WDT off voltage(BD3005HFP)
WDT on voltage(BD3005HFP)
*1 TdLH can be varied by changing the CT capacitance value.
TdLH (s)
≈
(1.26
×
CT (µF)) / Icto (µA) (Calculation uses Typ. values)
TWH (s)
≈
(1.02
×
CT (µF)) / Ictc (µA) (Calculation uses Typ. values)
TWL (s)
≈
(1.02
×
CT (µF)) / Icto (µA) (Calculation uses Typ. values)
Note: This IC is not designed to be radiation-resistant.
*2 TWH can be varied by changing the CT capacitance value.
*3 TWL can be varied by changing the CT capacitance value.
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Icc1
Icc2
—
—
80
80
130
130
µA
µA
Io=0mA
Io=200mA
Icc3
—
80
130
µA
VINH=0V
VOUT
4.90
—
5.00
10
5.10
20
V
Line.Reg
mV
Vcc=6.2½25 V
Load.Reg
∆Vd
—
15
30
mV
V
Io=5½200mA
—
0.78
—
1.1
—
Vcc=4.75 V, Io=200mA
IOUT
R.R.
500
45
mA
dB
VOUT=4.9V
55
—
Vdet
4.02
4.10
4.18
V
Vdet
4.40
50
4.50
100
21
4.60
150
40
V
VHS
mV
TdLH
12
—
mS
V
CT=0.1µF
*1
IRST=2mA
VRST
0.2
—
0.5
—
VOPL
1.0
V
VthH
VthL
Ictc
1.16
1.26
1.36
V
0.20
1
0.24
2
0.28
3
V
µA
Icto
3
6
10
µA
TWH
TWL
32
51
90
mS
CT=0.1µF
*2
CT=0.1µF
*3
10
17
—
30
—
mS
nS
TWCLK
500
VUINH
VLINH
3.2
0
—
8.0
V
—
1.8
V
f=120Hz, ein=1Vrms, Io=200mA
R
2/8
Reference data
(Unless otherwise specified, Ta = 25°C)
120
6
6
OUTPUT VOLTAGE: VOUT [V]
100
80
60
40
20
0
0
Ta=125
℃
5
4
OUTPUT VOLTAGE: VOUT [V]
Ta=-40
℃
5
4
3
2
1
0
Ta=25
℃
Ta=125
℃
CIRCUIT CURRENT: Icc [µA]
Ta=-40
℃
3
Ta=25
℃
Ta=-40
℃
Ta=25
℃
2
1
0
Ta=125
℃
5
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10
15
20
25
0
5
10
15
20
25
0
500
1000
1500
2000
SUPPLY VOLTAGE: Vcc [V]
SUPPLY VOLTAGE: Vcc [V]
OUTPUT CURRENT: IOUT [mA]
Fig. 1 Circuit Current
3
Fig. 2 Output Voltage vs
Supply Voltage
Fig. 3 Output Voltage vs Load
80
10
RIPPLE REJECTON: R.R. [dB]
DROPOUT VOLTAGE:
∆Vd
[V]
2.5
2
1.5
1
0.5
0
0
Ta=125℃
RESET VOLTAGE: VRESET[V]
60
8
Ta=25℃
6
BD3005HFP
40
4
Ta=-40℃
20
2
BD3004HFP
0
100
200
300
400
500
10
100
1000
10000 100000 1E+06
0
0
1
2
3
4
5
OUTPUT CURRENT: IOUT [mA]
FREQUENCY: f [Hz]
OUTPUT VOLTAGE: VOUT [V]
Fig. 4 I/O Voltage Difference
Fig. 5 Ripple Rejection
Fig. 6 Reset Detection Voltage
4.8
0.5
0
Rising Edge Detection Voltage
DETECTION VOLTAGE: [V]
4.6
0.4
CIRCIT CURRENT: Icc [µA]
BD3005HFP
CIRCUIT CURRENT: Icc [mA]
-10
4.4
Falling Edge Detection Voltage
Rising Edge Detection Voltage
0.3
-20
BD3004HFP
4.2
0.2
-30
4.0
Falling Edge Detection Voltage
0.1
-40
R
3.8
0
-50
-40
0
40
80
120
0
100
200
300
400
500
-15
-12
-9
-6
-3
0
ot
AMBIENT TEMPERATURE:Ta[
℃
]
OUTPUT CURRENT: IOUT [mA]
SUPPLY VOLTAGE: Vcc [V]
Fig. 7 Reset Detection Voltage
Temperature
2
0
Fig. 8 Total Supply Current
Classified by Load
Fig. 9 Back Current
5.5
6
N
OUTPUT VOLTAGE: VOUT [V]
OUTPUT VOLTAGE: VOUT [V]
0
40
80
120
CT PIN CURRENT: ICT [µA]
5
4
3
2
1
0
100
5.25
-2
-4
-6
-8
-10
0
0.5
1
1.5
2
2.5
3
5
4.75
4.5
-40
120
140
160
180
200
CT PIN VOLTAGE: VCT [V]
AMBIENT TEMPERATURE: Ta [
℃
]
AMBIENT TEMPERATURE: Ta [
℃
]
Fig. 10 CT Pin Charge vs
Discharge Current
Fig. 11 Output Voltage vs
Temperature
Fig. 12 Thermal Shutdown
Circuit
3/8
Block diagram
Vcc
HRP7
3
Reverse Polarity Protection
Pre Reg
Vref
OUT
TSD
Cin
FIN
5
Co
OUT
Vs
（BD3004HFP）
OCP
OUT
2
INH
（BD3005HFP）
Signal from
microcontroller
Pin descriptions
Pin. No
1
2
3
4
5
6
7
FIN
I/O Circuit diagram
Vcc
CLK
ot
N
OUT
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2
OUT
6
RESET
CLK
WDT
1 2 3 4 5 6 7
1
Cin: 0.33
µF
to 1000
µF
CT
GND
7
Co: 0.1
µF
to 1000
µF
4
CT
FIN
CT: 0.001
µF
to 22
µF
Fig.13
Pin name
CLK
Function
Clock input from microcontroller
Vs(BD3004HFP)
Vcc
Reset
detection voltage
adjustment function pin
Power supply pin
INH(BD3005HFP)
GND
OUT
CT
WDT on/off function pin (WDT off when INH = high; WDT on when INH = low)
GND pin
Voltage output pin
RESET
GND
Reset output pin
Reset output delay time, WDT monitor time setting external capacitance connection pin
GND pin
CLK (1 pin)
Vs(2 pin)
INH (2 pin)
PREREG
Vcc
PREREG
Vcc
PREREG
3.56M
Ω
R
100K
Ω
Vs
100K
Ω
INH
100K
Ω
1.56M
Ω
OUT (5 pin)
Vcc
RESET (6 pin)
OUT
OUT
OUT
CT (7 pin)
OUT
470K
Ω
RESET
Rb
Ra
CT
Fig.14
* All resistance values are typical ones.
4/8
●
Detection voltage adjustment
OUT
For a basic detection voltage of 4.1 V,
R4
Vs Detection voltage
1,25V(Typ.)
R2=3.56MΩ
Vdet = Vs
×
(R1 + R2 / R1)
To change the detection voltage,
insert pull-down resistor R3 (with a resistance value lower than R1)
between the Vs and GND pins, and pull-up resistor R4 (with a
resistance value lower than R2) between the Vs and Vo pins.
Vdet = Vs
×
(R3 + R4 / R3)
[R3<<R1, R4<<R2]
R3
R1=1.56MΩ
Timing chart
Vcc
0
VOUT
VdetH
Vdet
0
VINH
0
CLK
0
VthH
VCT VthL
0
TdLH
RESET
0
(2)
(1) (3) (4)(5)
Explanation
(1)
(2)
When the output voltage (VOUT) reaches 1.0 V, the reset pin voltage (RESET) will switch to low level.
When VOUT reaches or exceeds the reset clear voltage (VdetH), the external capacitor connected to the CT pin will begin to charge.
When the CT pin voltage (VCT) reaches the upper switching threshold voltage (VthH), RESET will maintain a low-level signal. When
VCT reaches the VthH voltage, RESET will switch from low to high level. The time from VCT reaching or exceeding the VdetH voltage
until RESET reverses (the RESET transmission delay time: TdLH) is given by the following equation:
[1]
TdLH (s)
≈
(1.26
×
CT (µF)) / Icto (µA)
The watchdog timer operates when RESET rises.
N
ot
(3)
(4)
When VCT reaches the lower switching threshold voltage (VthL), the CT pin switches from discharging to charging, and RESET
switches from high level to low level. The watchdog timer reset time TWL is given by the following equation:
TWL(s)
≈
(1.02
×
CT (µF)) / Icto (µA)
[2]
(5)
The CT pin state switches from charge to discharge when VCT reaches VthH, and RESET switches from low to high.
The watchdog timer monitor time TWH is given by the following equation:
TWH(s)
≈
(1.02
×
CT (µF)) / Ictc (µA)
[3]
(6)
(7)
(8)
(9)
The CT pin state may not switche from charge to discharge when the CLK input pulse width (TWCLK) is short.
Use a TWCLK input pulse width of at least 500 ns.
When a pulse (positive edge trigger) of at least 500 ns is input to the CLK pin while the CT pin is discharging, VCT switches from
discharging to charging and then switches back to discharging once it charges to VthH.
Watchdog timer operation is forced off when the INH pin switches to high. At that time, only the watchdog timer will be turned off, and
reset detection will operate normally.
The watchdog timer function turns on when the INH pin switches to low. At that time, the external capacitor on the CT pin will be
discharged.
(10) RESET switches from high to low when OUT falls to the RESET detection voltage (VDET) or lower.
(11) When VOUT falls to 0 V, the RESET signal stays low until VOUT reaches 1.0 V
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Fig.15
VHS
(All resistance values are typical ones.)
When VINH = high
WDT current off
VdetH = Vdet + VHS
TWCLK TWCLK
TWL
TWH
(6) (7)
(11)
(2) (10) (3) (5)
(4) (8)
(2) (4) (10)
(5) (9) (4)(5) (10) (3)
Fig.16
R
5/8
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