BL8506B
Voltage Detectors, BL8506B Series
General Description
BL8506B Series are a set of three-terminal
low power voltage detectors implemented in NMOS
technology. Each voltage detector in the series
detects a particular fixed voltage ranging from 2.0V
to 7.0V. The voltage detectors consist of a high
precision and low power consumption standard
voltage source, a comparator, hysteresis circuit, and
an output driver. NMOS technology ensures low
power consumption.
Features
Highly accuracy： ±
2%
Low power consumption：TYP 1.8uA (Vin=3V)
Detect voltage range：2.0V~7.0V in 0.1V increments
Operating voltage range：1.5V~18V
Detect voltage temperature characteristics：
TYP±
0.9mV/℃
Output configuration： NMOS
Package： SOT-23-3，SOT-23-5，SOT-89-3
Selection Guide
Selection Guide
BL8506B-XX
X
XX
Typical Application
Package Type：
RM： SOT-23-3
RN： SOT-23-5
SM： SOT-89-3
（Default、Pb
Free）
Battery checkers
Level selectors
Power failure detectors
Microcomputer reset
Battery backup of Memories
Store non-volatile RAM signal protectors
Typical Application Circuit
Output Type：
N：Nch Open-drain
Detector Voltage：
20……2.0V
30……3.0V
……
70……7.0V
60……6.0V
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Total 6 Pages
BL8506B
Pin Configuration
Pin Assignment
SOT-23-3
2
1
3
Pin Number
SOT-23-5
3
1
2
4
5
Pin Name
SOT-89-3
3
1
2
GND
V
OUT
V
IN
NC
NC
Functions
Ground
Output Voltage
Input Voltage
No Connection
No Connection
Product Classification
Product Name
BL8506B-XXNRM
BL8506B-XXNRN
BL8506B-XXNSM
Detector Voltage
XX V
XX V
XX V
Output Type
Nch Open-Drain
Nch Open-Drain
Nch Open-Drain
Package
SOT-23-3
SOT-23-5
SOT-89-3
Block Diagram
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BL8506B
Absolute Maximum Ratings
PARAMETER
V
IN
Input Voltage
Output Current
Output Voltage
Continuous Total Power
Dissipation
NMOS
SOT23-3/5
SOT89-3
P
D
T
Opr
T
stg
T
solder
SYMBAL
V
IN
I
OUT
V
OUT
RATINGS
18
50
GND-0.3~ V
IN
+0.3
300
mW
500
0~+70
-50~+125
260℃, 10s
℃
℃
UNITS
V
mA
V
Operating Ambient Temperature
Storage Temperature
Soldering temperature and time
Electrical Characteristics
(
V
DET
=2.0V to 7.0V ,T
A
=25℃ ,unless otherwise noted)
Parameter
V
DET
V
HYS
Symbol
Detect
Voltage
Hysteresis
Width
V
DET
=2.0V~ 2.8V
I
IN
Operating
Current
V
DET
=2.8V~ 3.6V
V
DET
=3.6V ~ 4.7V
V
DET
=4.7V~ 7.0V
V
IN
Operating
Voltage
V
DET
=2.0V to 7.0V
V
DET
=2.0V~ 2.8V
V
DET
=2.8V~ 3.6V
V
DET
=3.6V ~ 4.7V
V
DET
=4.7V~ 7.0V
∆V
DET
/∆T
A
Temperature
characteristics
0℃≤T
opr
≤70℃
V
IN
=-V
DET(S)
-0.2
V , V
OUT
=0.2V
V
IN
=-V
DET(S)
-0.5
V , V
OUT
=0.3V
V
IN
=-V
DET(S)
-0.5
V , V
OUT
=0.3V
V
IN
=-V
DET(S)
-0.5
V , V
OUT
=0.3V
V
IN
=3.0V
V
IN
=4.0V
V
IN
=5.0V
V
IN
=8.0V
Conditions
Min.
V
DET
×0.99
V
DET
×0.02
-
-
-
-
0.7
0.5
0.5
1.2
2.5
±
0.9
mV/℃
mA
Typ.
V
DET
V
DET
×0.05
1.8
1.8
2.1
2.5
-
Max.
V
DET
×1.01
V
DET
×0.1
3
4
4
4
18
V
μA
Units
V
V
I
OL
Output Sink
Current
Note:
1、VDF(S)
：Specified
Detection Voltage value
2、VDF
：Actual
Detection Voltage value
3、Release Voltage：VDR=VDF+VHYS
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BL8506B
Functional Description
The BL8506B series is a set of voltage detectors equipped with a high stability voltage reference which is
connected to the negative input of a comparator — denoted as V
REF
in the following figure (Fig. 1).When the voltage
drop to the positive input of the comparator (i,e,V
B
) is higher than V
REF
, V
OUT
goes high, M1 turns off, and V
B
is
ex-pressed as V
BH
=V
IN
×(R
B
+R
C
)/(R
A
+R
B
+R
C
).If V
IN
is decreased so that V
B
falls to a value that is less than V
REF
, the
comparator output inverts (from high to low), V
OUT
goes low, V
C
is high, M1 turns on, R
C
is bypassed, and V
B
becomes: V
BL
=V
IN
×R
B
/(R
A
+R
B
), which is less than V
BH
. By so doing the comparator out-put will stay low to prevent
the circuit from oscillating when V
B
≈
V
REF
. If V
IN
falls bellow the minimum operating voltage, the output becomes
undefined. When V
IN
goes from low to V
IN
×R
B
/(R
A
+R
B
) >V
REF
, the comparator output goes high and V
OUT
goes high
again. The detection voltage is as defined:
V
DET(–)
=( R
A
+R
B
+R
C
)×V
REF
/( R
B
+R
C
)
The release voltage is as defined:
V
DET(+)
=(R
A
+R
B
)×V
REF
/ R
B
The hysteresis width is:
V
HYS
=V
DET(+)
–V
DET(–)
Fig.1 demonstrates the NMOS output type with positive output polarity (V
OUT
is normally high, active low).
Fig.1 NMOS output voltage detector (BL8506B)
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Total 6 Pages
BL8506B
Timing Chart
Package Information
●
SOT89-3
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Total 6 Pages
stm32/stm8
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