BL8518
Low Voltage Detector With Built-in Delay Circuit
DESCRIPTION
FEATURES
BL8518 is a series of high precision voltage
detector with ultra-low current consumption
(4.5uA typ. at Vin=3.0V) and a built-in delay
circuit. It can work at very low voltage, which
makes it perfect for system reset.
BL8518 is composed of high precision voltage
reference, comparator, delay circuit, output
driver and resistor array. Internally preset detect
voltage has a low temperature drift and requires
no external trimming.
High-Precision Detection Voltage: 3%
Detection Voltage: 2.63V and 2.93V
(customized other voltages)
Built-in Power on Reset Delay time circuit:
Refer to Selection Guide
Operating Voltage Range: 1.2V~6V
Ultra-low current consumption:
4.5uA typ. (at Vin=3.0V)
Two Output Forms: CMOS (Active Low) and
N-channel open-drain (Active Low)
APPLICATIONS
Two type of output, CMOS and N-channel opendrain are available.
BL8518 is available in small size SOT-23 package
which is Pb free.
Power monitor for portable equipment such
as PDA,DSC,Mobile phone,Notebook,MP3
CPU and Logic Circuit Reset
Battery Checker
Battery Back-up Circuit
Power Failure Detector
ELECTRICAL CHARACTERISTICS
TYPICAL APPLICATION
Detector threshold=2.93V
6
VDD
BL8518
LC9018
Supply current(uA)
VIN
5
VOUT
VSS
4
3
2
-40℃
1
25℃
70℃
0
0
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1
1
2
3
4
Input Voltage(V)
5
6
BL8518
ORDERING INFORMATION
PIN CONFIGURATION
Product Classification
BL8518 □
1□
2□
3□
4□
5□
6
Code
Marking
XXX: Detector
Voltage
XXXDC/ D:Delay time
XXXDN D:200mS
C:CMOS
N:Nch
Description
Temperature&Rohs:
C:-40~85C ,Pb Free Rohs Std.
Package type:
B3:SOT-23(A)
B3B:SOT-23(B)
Packing type:
TR:Tape&Reel (Standard)
Detector Voltage:
e.g. 263=2.63V
293=2.93V
Delay time:
D:200mS
Output forms:
C:CMOS
N:Nch
□1
□2
□3
□4
□5
□6
BL8518CB3TR□□□
Product Classification
BL8518CB3BTR□□□
Marking
XXX: Detector
Voltage
XXXDC/ D:Delay time
XXXDN D:200mS
C:CMOS
N:Nch
Vss
VDD
Vout
Ground Pin
Supply Voltage Input
Voltage detection output pin
ABSOLUTE MAXIMUM RATING
Parameter
Value
Input Voltage
Output Voltage range
Maximum Output current
Ambient Temperature(Ta)
Power Dissipation
SOT-23
Storage Temperature(Ts)
Lead Temperature & Time
-0.3V-8V
-0.3V- 8V
70mA
-40C -85C
250mW
-40C -150C
260C,10S
Note:
Exceed these limits to damage to the device.
Exposure to absolute maximum rating conditions may affect device reliability.
RECOMMENDED WORK CONDITIONS
Item
Input Voltage Range
Ambient Temperature
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Min
Recommended
Max.
Unit
25
6
85
V
C
1.2
-40
2
BL8518
ELECTRICAL CHARACTERISTICS
BL8518CXXTR263DC/N(2.63V)
(Topt=25℃,Unless otherwise specified.)
Symbol
-VDET
ISS
VDDH
VDDL
Parameter
Conditions
Detector Threshold
Current consumption
Maximum operating voltage
Minimum Operating voltage
IOUT
2.551
0.5
2.0
mA
Reference data
Min.
Typ.
Max.
Unit
1.0
2.63
4.5
2.709
10
10
Unit
V
uA
V
V
VDD=4.63V
Pch
VDS=-2.1V,VDD=4.5V
Output current
Reference data
Min.
Typ.
Max.
BL8518CXXTR293DC/N(2.93V)
(Topt=25℃,Unless otherwise specified.)
Symbol
Parameter
Conditions
-VDET
ISS
VDDH
VDDL
Detector Threshold
Current consumption
Maximum operating voltage
Minimum Operating voltage
IOUT
Output current
2.842
VDD=4.93V
Pch
VDS=-2.1V,VDD=4.5V
1.0
2.93
4.5
3.018
10
10
0.5
V
uA
V
V
2.0
mA
ELECTRICAL CHARACTERISTICS BY OUTPUT DELAY TIME
Part Number
Test Condition
BL8518CXXTRXXXDC/N
VDD=1.0V to Vdet+1.0V
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3
Output Delay Time
Min.
Typ.
Max.
Unit
140
ms
200
300
BL8518
BLOCK DIAGRAM
VDD
Vout
_
Delay
Time
circuit
+
Vref
Vss
N Channel Open Drain
VDD
_
Vref
Delay
Time
circuit
+
Vout
Vss
CMOS Output
FUNCTION DESCRIPTION
VDD
Ra
+
_
Vref
Delay
Vout
Rb
Vss
High precision low temperature co-efficiency reference voltage is applied to the negative input of a
comparator. Input voltage, divided by resistor array of Ra and Rb, is applied to the positive input of the
comparator. Output of the comparator passes a delay circuit and a series of buffer to drive the output
CMOS pair.
VDET =VREF*(1+Ra/Rb)
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4
BL8518
Ⅰ
Ⅱ
Ⅳ
Ⅲ
B
Supply A
Voltage
VDD
Ⅴ
Detector Treshold(Vdet)
Release Voltage
Minimum
Operating Voltage
Vss
Output
Voltage
(Vout)
Tdelay
Vss
No.
I
II
III
IV
V
Operation status
Output status
VDD>Vdet
VDD drops below Vdet
VDD drops further below VDDL
VDD rises above VDDL
VDD rises above Vdet
Output voltage is equal to the supply voltage
Output voltage equals to GND level
Output voltage is undefined
Output voltage equals to GND level
Output voltage equals to supply voltage after Tdelay
TEST CIRCUITS
(1) Supply current test circuit
(2) Detector threshold test circuit
VDD
VIN
BL8518
LC9018
BL8518
VOUT
VOUT
VSS
(3) NCH Drive Output Current Test Circuit
(4) PCH Drive Output Current Test Circuit
VDS
VDD
VIN
LC9018
BL8518
VSS
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VDD
VOUT
IOUT
VIN
VDS
LC9018
BL8518
VSS
5
VOUT
IOUT
VDD - VDS
BL8518
TYPICAL PERFORMANCE CHARACTERISTICS
1) Supply current VS. Input voltage
2) Detector Threshold VS. Temperature
Detector threshold=2.93V
3.1
5
3.0
Detector threshold(V)
Supply current(uA)
Detector threshold=2.93V
6
4
3
2
-40℃
1
2.9
2.8
2.7
2.6
25℃
70℃
2.5
0
0
1
2
3
4
Input Voltage(V)
5
-40 -30 -20 -10 0
6
3) Nch Driver Output Current VS. VDS
4) NCH Driver Output Current vs. Input Voltage
Detector threshold=2.93V
Detector threshold=2.93V
20
25
-40℃
25℃
70℃
18
20
Output Current(mA)
Output Current(mA)
16
14
12
10
8
6
4
15
10
5
VDD=2V
VDD=1V
2
0
0.0
0.5
1.0
1.5
VDS(V)
2.0
2.5
0
3.0
0
5) PCH Driver Output Current vs. Input Current
Detector threshold=2.93V
40
Vds=0.5V
Vds=1.0V
Vds=1.5V
Vds=2.0V
35
30
Output Current(mA)
10 20 30 40 50 60 70 80 90
Temperature(℃)
25
20
15
10
5
0
0
1
2
3
4
5
Input Voltage Vin(V)
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6
7
6
1
2
Input Voltage Vin(V)
3
4
BL8518
PACKAGE LINE
Package
SOT-23
Devices per reel
Package dimension:
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7
3000Pcs
Unit
mm
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