Datasheet
LDO Regulators with Watch-Dog Timer
500mA Output LDO Regulators
with Voltage Detector and Watchdog Timer
BD3020HFP BD3021HFP
General Description
BD3020HFP BD3021HFP is a regulator IC with integrated
WDT (Watch Dog Timer), high output voltage accuracy
±2.0 % and 80 µA (Typ) low circuit current consumption.
These are supports usage of low ESR ceramic capacitor for
output stability. The reset detection voltage can be adjusted
by connecting resistors on the Vs terminal (BD3020HFP).
They can be a stable power supply for any applications while
detecting malfunction of microcontrollers.
Key specification
Low Circuit Current:
Output Voltage:
Output Current:
High Output Voltage Accuracy:
Low ESR ceramic capacitor
can be used as output capacitor
80
μA
(Typ)
5.0 V (Typ)
500 mA
±2 %
Features
Integrated WDT Reset Circuit
[BD3020HFP]: Adjustable Detection Voltage
through Vs pin
[BD3021HFP]: WDT Can be Switched ON / OFF
by Using INH Pin
Low saturation voltage by using PMOS output transistor
VCC Max Voltage: 50 V
Integrated Over Current Protection and
Thermal Shut Down
HRP7 package
Package
HRP7
W (Typ) × D (Typ) × H (Max)
9.395 mm × 10.540 mm × 2.005 mm
Figure 1. Package Outlook
Applications
Automotive (body, audio system, navigation system, etc.)
Typical Application Circuits
FIN
FIN
BD3020HFP
2.Vs
1.CLK
4.GN D
3.VCC
6.RESET
7.CT
5.VOUT
1.CLK
BD3021HFP
2.INH
4.GN D
3.VCC
6.RESET
7.CT
5.VOUT
BD3020HFP
BD3021HFP
Figure 2. Typical Application Circuits
○Product
structure：Silicon monolithic integrated circuit
.
www.rohm.com
© 2013 ROHM Co., Ltd. All rights reserved.
TSZ22111・14・001
○This
product is not designed protection against radioactive rays
1/24
TSZ02201-0G1G0AN00480-1-2
10.Nov.2015 Rev.001
BD3020HFP BD3021HFP
Ordering Information
Datasheet
B
D
3
0
2
X
H
F
P
-
T
R
Taping
TR: reel-wound embossed tamping
Part number
3020
3021
Package
HFP: HRP7
Pin Configuration
Pin Description
Pin No.
1
Pin Name
CLK
Vs
(BD3020HFP)
INH
(BD3021HFP)
VCC
GND
VOUT
RESET
CT
GND
Function
Clock Input from Microcontroller
Reset Detection Voltage Set Pin
WDT ON/OFF Function Pin
Power Supply Pin
GND
Voltage Output Pin
Reset Output Pin
External Capacitance for Reset
Output Delay Time, WDT Monitor
Time Setting Connection Pin
GND
(TOP VIEW)
FIN
2
3
4
5
6
1
2
3
4
5
6
7
Figure 3. Pin Configuration
7
Fin
Block Diagram
<BD3020HFP>
<BD3021HFP>
Figure 4. Block Diagrams
www.rohm.com
.
© 2015 ROHM Co., Ltd. All rights reserved.
TSZ22111・15・001
2/24
TSZ02201-0G1G0AN00480-1-2
10.Nov.2015 Rev.001
BD3020HFP BD3021HFP
Absolute Maximum Ratings (Ta = 25 °C)
Parameter
Supply Voltage
Vs pin Voltage (BD3020HFP)
INH pin Voltage (BD3021HFP)
Regulator Output pin Voltage
Reset Output pin Voltage
Watchdog Input pin Voltage
Reset Delay Setting pin Voltage
Power Dissipation
Operating Temperature Range
Storage Temperature Range
Maximum Junction Temperature
(1)
(2)
(2)
(1)
Datasheet
Symbol
V
CC
Vs
V
INH
V
OUT
V
RESET
V
CLK
V
CT
Pd
Topr
Tstg
Tjmax
Ratings
-0.3 to +50.0
-0.3 to +15.0
-0.3 to +15.0
-0.3 to +15.0
-0.3 to +15.0
-0.3 to +15.0
-0.3 to +15.0
1.6
-40 to +125
-55 to +150
150
Unit
V
V
V
V
V
V
V
W
°C
°C
°C
Pd should not be exceeded.
HRP7 mounted on 70.0 mm
×
70.0 mm
×
1.6 mmt Glass-Epoxy PCB. If Ta
≥
25 °C, reduce by 12.8 mW / °C.
(1-layer PCB: Copper foil area on the reverse side of PCB: 0 mm
×
0 mm)
Caution:
Operating the IC over the absolute maximum ratings may damage the IC. The damage can either be a short circuit between pins
or an open circuit between pins and the internal circuitry. Therefore, it is important to consider circuit protection measures, such as adding
a fuse, in case the IC is operated over the absolute maximum ratings.
Operating Conditions (-40°C
≤
Ta
≤
+125 °C)
Parameter
Supply Voltage
Output Current
(3)
(3)
Symbol
V
CC
Io
Min
5.6
0
Max
36.0
500
Unit
V
mA
For the output voltage, consider the voltage drop (dropout voltage) due to the output current.
www.rohm.com
.
© 2015 ROHM Co., Ltd. All rights reserved.
TSZ22111・15・001
3/24
TSZ02201-0G1G0AN00480-1-2
10.Nov.2015 Rev.001
BD3020HFP BD3021HFP
Electrical Characteristics
(Unless otherwise specified, -40°C
≤
Ta
≤
+125 °C, V
CC
= 13.5 V, V
CLK
= GND)
Limit
Parameter
Symbol
Min
Overall Device
Bias Current 1
Bias Current 2
Regulator
Output Voltage
Line Regulation
Load Regulation
Dropout Voltage
Ripple Rejection
Reset
Detection Voltage (BD3020HFP）
Detection Voltage (BD3021HFP)
Hysteresis Width
Output Delay Time LowHigh
(Power On Reset Time)
Output Delay Time High→Low
Vdet
Vdet
V
HS
t
dLH
4.02
4.40
50
1.1
4.10
4.50
100
1.9
4.18
4.60
150
2.7
V
V
mV
ms
V
OUT
Line.Reg
Load.Reg
∆Vd
R.R.
4.90
－
－
－
45
5.00
5
30
0.3
55
5.10
35
70
0.6
－
V
mV
mV
V
dB
Io = 200 mA
5.6 V
≤
V
CC
≤
36 V
5 mA
≤
Io
≤
200 mA
Icc1
Icc2
－
－
80
150
130
300
μA
μA
Io = 0 mA
Io = 50 mA (Ta = 25 °C)
Typ
Max
Unit
Conditions
Datasheet
V
CC
= 4.75 V, Io = 200 mA
f = 120Hz, ein = 1 Vrms, Io = 100 mA
V
CC
= Vdet ±0.5 V (V
CC
= V
OUT
)
INH = open
(1)
, C
CT
= 0.01
μF
V
CC
= Vdet ±0.5 V (V
CC
= V
OUT
)
INH = open
(1)
, C
CT
= 0.01
μF
V
CC
= 1.5 V, V
RESET
= 0.5 V
(V
CC
= V
OUT
)
V
CC
= 1.5 V, V
CT
= 0.5 V
(V
CC
= V
OUT
)
V
OUT
= 4.0 V
t
dHL
－
100
300
μs
RESET Discharge Current
I
RESET
0.2
－
－
mA
CT Discharge Current
Low Output Voltage
Min Operating Voltage
(1) BD3021HFP only
Ict
V
RST
V
OPL
0.1
－
1.5
－
0.1
－
－
0.2
－
mA
V
V
www.rohm.com
.
© 2015 ROHM Co., Ltd. All rights reserved.
TSZ22111・15・001
4/24
TSZ02201-0G1G0AN00480-1-2
10.Nov.2015 Rev.001
BD3020HFP BD3021HFP
Electrical Characteristics
(Unless otherwise specified, -40°C,
≤
Ta
≤
+125 °C, V
CC
= 13.5 V, V
CLK
= GND)
Limit
Parameter
Symbol
Min
Watchdog timer
CT Switching Threshold Voltage High
CT Switching Threshold Voltage Low
WDT Charge Current
VthH
VthL
Ictc
1.08
0.13
3.5
1.15
0.15
6.0
1.25
0.17
8.5
V
V
μA
Typ
Max
Unit
Conditions
Datasheet
WDT ON
(1)
, INH = open
(1)
WDT ON
(1)
, INH = open
(1)
WDT ON
(1)
, INH = open
(1)
V
CT
= 0 V
WDT ON
(1)
, INH = open
(1)
V
CT
= 1.3 V
WDT ON
(1)
, INH = open
(1)
,
C
CT
= 0.01
μF
(
Ceramic Capacitor
)
(2)
WDT Discharge Current
Ictd
1.2
2.0
2.8
μA
Watchdog Monitor Time Low
t
WH
3.0
5.0
7.0
ms
Watchdog Reset Time
CLK Input Pulse Width
INH
*
WDT OFF Threshold Voltage
WDT ON Threshold Voltage
INH Input current
(1) BD3021HFP only
(2) Characteristics of ceramic capacitor not considered.
t
WL
t
WCLK
1.0
500
1.7
-
2.4
-
ms
ns
V
HINH
V
LINH
I
INH
V
OUT
× 0.8
0
-
-
-
10
V
OUT
V
OUT
× 0.3
20
V
V
μA
INH is pulled down inside the IC
when INH open.
V
INH
= 5 V
www.rohm.com
.
© 2015 ROHM Co., Ltd. All rights reserved.
TSZ22111・15・001
5/24
TSZ02201-0G1G0AN00480-1-2
10.Nov.2015 Rev.001
电子竞赛
京公网安备 11010802033920号
Copyright © 2005-2026 EEWORLD.com.cn, Inc. All rights reserved
电子工程世界
