Datasheet
Voltage Detector IC Series
Bipolar
Voltage Detector ICs
BD47xx series
●General
Description
The BD47xx series is a Voltage Detector IC,
developed to prevent system errors at transient state,
when the power of CPU or logic circuit switches
ON/OFF or in cases of momentary shut down. These
ICs consist of three terminals (power supply, GND and
reset output) to detect power supply voltages and
outputs reset signals of various systems. These ICs
are ultra-compact and have low current consumption,
making them ideal for portable products.
●Key
Specifications
Detection voltage range:
1.9V to 4.6V (Typ.)
0.1V steps
High accuracy detection voltage:
±1%
Low current consumption:
1.6µA (Typ.)
Operating temperature range:
-40°C to +75°C
●Package
SSOP5
2.90mm x 2.80mm x 1.25mm
●Features
High accuracy detection
Low current consumption
Very small package
Open collector “L” reset output
Package SSOP5 is similar to SOT-23-5 (JEDEC)
●Applications
Circuits using microcontrollers or logic circuits that require
a reset.
●Typical
Application Circuit
V
DD
R
L
BD47xx series
V
OUT
V
DD
RESET
CPU
Micro-controller
C
L
GND
GND
●Connection
Diagram
SSOP5
TOP VIEW
V
DD
●Pin
Descriptions
V
OUT
PIN No.
1
2
3
4
5
Symbol
N.C.
SUB
GND
V
OUT
V
DD
Function
Unconnected Terminal
Substrate*
GND
Reset Output
Power Supply Voltage
Marking
N.C.
SUB GND
Lot. No
*
Substrate Pin should be connected with GND
○This
product is not designed for protection against radioactive rays
○Product
structure：Silicon monolithic integrated circuit
.
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BD47xx series
●Ordering
Information
B
Part
Number
D
4
7
x
x
G
-
T
R
Reset Voltage Value Package
19 : 1.9V
G : SSOP5
0.1V step
46 : 4.6V
(SOT-23-5)
Packaging and
forming specification
TR : Embossed tape
and reel
●Lineup
Marking
B2
B1
BZ
BY
BX
BW
BV
BU
BT
BS
Detection
Voltage
4.6V
4.5V
4.4V
4.3V
4.2V
4.1V
4.0V
3.9V
3.8V
3.7V
Part Number
BD4746
BD4745
BD4744
BD4743
BD4742
BD4741
BD4740
BD4739
BD4738
BD4737
Marking
BR
BQ
BP
B4
BN
BM
BL
BK
BJ
B3
Detection
Voltage
3.6V
3.5V
3.4V
3.3V
3.2V
3.1V
3.0V
2.9V
2.8V
2.7V
Part Number
BD4736
BD4735
BD4734
BD4733
BD4732
BD4731
BD4730
BD4729
BD4728
BD4727
Marking
BH
BG
BF
BE
BD
BC
BB
BA
Detection
Voltage
2.6V
2.5V
2.4V
2.3V
2.2V
2.1V
2.0V
1.9V
Part Number
BD4726
BD4725
BD4724
BD4723
BD4722
BD4721
BD4720
BD4719
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BD47xx series
●Absolute
maximum ratings
Parameter
Power Supply Voltage
Output Voltage
Output Current
*1 *2
Power Dissipation
Operation Temperature Range
Ambient Storage Temperature
Symbol
V
DD
V
OUT
Io
Pd
Topt
Tstg
Limit
-0.3 to +10
-0.3 to +10
60
540
-40 to +75
-55 to +125
Unit
V
V
mA
mW
°C
°C
*1 Reduced by 5.4mW/°C when used over 25°C.
*2 When mounted on ROHM standard circuit board (70mm×70mm×1.6mm, glass epoxy board).
●Electrical
characteristics (Unless Otherwise Specified Ta=25°C)
Parameter
Symbol
V
DD
=HL
VDET=2.5V
Detection Voltage
V
DET
VDET=3.0V
VDET=3.3V
VDET=4.2V
Condition
RL=4.7kΩ
Ta=+25°C
Ta=-40°C to 75°C
Ta=+25°C
Ta=-40°C to 75°C
Ta=+25°C
Ta=-40°C to 75°C
Ta=+25°C
Ta=-40°C to 75°C
Min.
V
DET
(T)
V
DET
(T)
×0.99
2.475
2.5
2.418
-
2.970
3.0
2.901
-
3.267
3.3
3.191
-
4.158
4.2
4.061
-
-
30
-
-
-
-
-
-
-
3.0
±0.01
50
20
60
0.1
1.5
1.6
0.65
-
15.0
Limit
Typ.
Max.
V
DET
(T)
×1.01
2.525
2.584
3.030
3.100
3.333
3.410
4.242
4.341
-
100
50
120
0.4
3.0
3.2
0.85
0.1
-
Unit
V
Temperature Coefficient
V
DET
/∆T R
L
=4.7kΩTa=-20 to+75°C Designed Guarantee
Of Detection Voltage
Detection Hysteresis Voltage ∆V
DET
R
L
=4.7kΩ, V
DD
=LHL
*1
Transfer Delay Time
”H”
t
PLH
C
L
=100pF，R
L
=4.7kΩ
*2
Transfer Delay Time
”L”
t
PHL
C
L
=100pF，R
L
=4.7kΩ
Reset Output Voltage
”L”
V
OL
V
DD
=V
DET
(min.)-0.05V, R
L
=4.7kΩ
Circuit Current ON
Icc1
V
DD
=V
DET
(min.)-0.05V, R
L
=∞
Circuit Current OFF
Icc2
V
DD
=V
DET
(typ.)/0.85V, R
L
=∞
Operating Voltage Range
V
OPL
R
L
=4.7kΩ，V
OL
≤0.4V
Output Leak Current
I
leak
V
DD
=V
OUT
=10V
Reset Output Current
”L”
I
OL
Vo=0.4V, V
DD
=V
DET
(min.)-0.05V
V
DET
(T)
:Standard Detection Voltage(1.9V to 4.6V, 0.1V step）
R
Ｌ
:Pull-up resistor to be connected between V
OUT
and power supply.
C
L
:Capacitor to be connected between V
OUT
and GND.
*1 t
PLH
:V
DD
=(V
DET
(typ.)-0.4V)(V
DET
(typ.)+0.4V)
*2 t
PHL
:V
DD
=(V
DET
(typ.)+0.4V)(V
DET
(typ.)-0.4V)
Design Guarantee. (Outgoing inspection is not done on all products)
%/°C
mV
µs
µs
V
µA
µA
V
µA
mA
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BD47xx series
●Block
Diagram
V
DD
5
4
V
OUT
Vref
3
GND
Fig.1 BD47xx series
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BD47xx series
●Typical
Performance Curves
CIRCUIT CURRENT
：
I
CC
[μA]
9
8
7
6
5
4
3
2
1
0
0
1
2
3
【BD4729】
【BD4729G】
"LOW" OUTPUT CURRENT ： I
OL
[mA]
10
800
700
600
500
400
300
200
100
0
0
5
10
15
20
25
30
OUTPUT VOLTAGE ： V
OUT
[mV]
I
OL
=12.194mA at Vo=400mV
【BD4729】
】
【
BD4729G
Icc1=1.34μA
Ic 2 1 6 A
c = .4 μ
4
5
6
7
8
9 10
V
DD
SUPPLY VOLTAGE
：V
DD
[V]
Fig.2 Circuit Current
Fig.3 “Low” Output Current
6
1000
OUTPUT VOLTAGE
：
V
OUT
[V]
【BD4729】
【
BD4729G
】
5
4
3
2
1
0
0
1
2
3
4
5
6
V
DD
SUPPLY VOLTAGE
：V
DD
[V]
OUTPUT VOLTAGE ： V
OUT
[mV]
900
800
700
600
500
400
300
200
100
0
0
0.5
1
1.5
【BD4729G】
【BD4729】
V
DET
=2.90V
V
DET
=2.95V
⊿V
DET
=50mV
V
OPL
=0.675V
2
2.5
V
DD
SUPPLY VOLTAGE ： V
DD
[V]
Fig.4 I/O Characteristics
Fig.5 Operating Limit Voltage
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