CAT808
Low-Power Precision
Voltage Detector
Description
The CAT808 is a high−precision voltage detector designed for
monitoring single cell and multi−cell batteries. Voltage detection
thresholds between 2.0 V and 3.5 V are provided with 0.1 V resolution
and
±3.0%
accuracy.
The CAT808 open−drain output is active low until the V
DD
voltage
exceeds the detection threshold. A low hysteresis is built into the
device to minimize output “chatter”, while V
DD
passes through the
detection threshold, and the output transitions high.
After the CAT808 asserts the output high condition, it continues to
monitor V
DD
until it drops below the detection threshold, when the
output goes low until V
DD
once again exceeds the detection threshold.
Features
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5
1
TSOT−5
TD SUFFIX
CASE 419AE
•
•
•
•
•
•
•
MARKING DIAGRAM
TLYM
Ultra Low Current Consumption 2.4
mA
Accurate Voltage Detection Threshold
Fine Voltage Detection Threshold Resolution
Open Drain Output (Active Low)
Industrial Temperature Range
−40°C
to +85°C
5−pin TSOT−23
These Devices are Pb−Free, Halogen Free/BFR Free and are RoHS
Compliant
Battery−Powered Systems
Power Supply Monitoring
Handheld and Portable Equipment
Processor Supervisor Reset
TL
Y
M
= Specific Device Code
= Production Year
= Production Month
PIN CONNECTIONS
1
OUT
V
DD
GND
(Top View)
NC
NC
Applications
•
•
•
•
IN
V
DD
Battery
Voltage
CAT808
OUT
GND
10 kW
DC−DC
CONVERTER
SHDN
OUT
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 6 of this data sheet.
GND
Note:
The value of the pull−up resistor is not critical
Figure 1. Typical Application
©
Semiconductor Components Industries, LLC, 2011
September, 2011
−
Rev. 6
1
Publication Order Number:
CAT808/D
CAT808
Table 1. ABSOLUTE MAXIMUM RATINGS
Parameters
Temperature under Bias
Storage Temperature
Voltage on any Pin with Respect to GND (Notes 1, 2)
V
DD
with Respect to GND
Lead Soldering temperature (10 seconds)
Power Dissipation
Ratings
−55
to +125
−65
to +150
−2.0
to V
DD
+ 2.0
−2.0
to 7.0
+300
250
Units
°C
°C
V
V
°C
mW
Stresses exceeding Maximum Ratings may damage the device. Maximum Ratings are stress ratings only. Functional operation above the
Recommended Operating Conditions is not implied. Extended exposure to stresses above the Recommended Operating Conditions may affect
device reliability.
1. The Minimum DC input voltage is
−0.5
V. During transitions, inputs may undershoot to
−2.0
V for periods of less than 20 ns. Maximum DC
voltage on output pins is V
CC
+0.5 V, which may overshoot to V
CC
+2.0 V for periods of less than 20 ns.
2. Latch−up protection is provided for stresses up to 100 mA on all pins from
−1
V to V
CC
+1 V.
Table 2. RECOMMENDED OPERATING CONDITIONS
Parameters
V
DD
Operating Temperature Range
Ratings
+1.2 to +6.0
−40
to +85
Units
V
°C
Table 3. DC ELECTRICAL CHARACTERISTICS
(T
A
=
−40°C
to +85°C, V
DD
= 1.2 V to 6.0 V)
Symbol
V
DET
Parameter
Detection Voltage
Conditions
CAT808Nxxx−25
CAT808Nxxx−27
CAT808Nxxx−32
CAT808Nxxx−35
I
DD
Current Consumption
V
DD
= 4.0 V
V
DD
= 5.0 V
V
DD
= 6.0 V
I
OUT
I
LEAK
T
PHL/LH
DV
DET
DT
A
•
V
DET
(typ)
Output Sink Current
V
DS
= 0.5 V
V
DD
= 1.2 V
V
DD
= 2.4 V
Output Leakage Current
Response Time
Detection Voltage Temperature
Coefficient (Note 3)
V
DS
= 5.0 V, V
DD
= 5.0 V
–
Min
2.43
2.62
3.12
3.42
−
−
−
0.6
2.9
−
−
−
Typ
2.5
2.7
3.2
3.5
2.4
3.5
5
1.4
5
−
−
±10
Max
2.57
2.78
3.28
3.58
5
7
10
−
−
1
60
±100
mA
ms
ppm/°C
mA
mA
Units
V
3. The temperature change ratio in the detection voltage [ppm/°C] is calculated by using the following equation:
DV
DET
DT
A
@
V
DET
(typ)
1, 000, 000[ppm
o
C]
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2
CAT808
Operation – Voltage Detector
The CAT808 has an active low output that asserts (pulls
low) when the supply voltage drops below the detection
threshold voltage (V
DET
). The open−drain output requires
an external pull−up resistor between the output pin and the
supply voltage (as shown in the typical application
diagram). On power−up, OUT is held active low until the
supply voltage (V
DD
) rises above V
DET
. While V
DD
is above
V
DET
, OUT stays high until V
DD
drops below V
DET
, then
OUT once again goes low.
V
DD
*
V
DET(MAX)
V
DET
V
DET(MIN)
GND
T
PLH
V
OH
V
DD
OUT
VOLTAGE
REFERENCE
Figure 2. Block Diagram
V
DET(MAX)
V
DET
V
DET(MIN)
T
PHL
OUT Slews with V
DD
OUT
* Voltage of V
DD
below 1 volt will not be able to maintain low output.
Figure 3. Timing Diagram
Table 4. PIN FUNCTIONS
Pin
V
DD
GND
OUT
NC
Function
Voltage Input and Power Supply
Ground Pin
Active Low Open Drain output
No Connect, the pin is electrically open
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3
CAT808
TYPICAL ELECTRICAL OPERATING CHARACTERISTICS
(Typical values at T
A
= 25°C)
5
4
2.705
V
DET
(V)
2.700
2
3
4
SUPPLY VOLTAGE (V)
5
6
2.695
−40
3
2
1
0
2.710
SUPPLY CURRENT (mA)
−5
30
TEMPERATURE (°C)
65
100
Figure 4. V
DD
Supply Current vs. V
DD
Supply
Voltage
100
T
PLH
10
8
6
4
2
0
Figure 5. V
DET
Detection Voltage vs.
Temperature
RESPONSE TIME (ms)
10
−40°C
+25°C
+90°C
1
0.1
T
PHL
0.01
0.001
0.01
0.1
1
10
100
I
OUT
(mA)
1.0
1.5
V
DD
(V)
2.0
2.5
LOAD CAPACITANCE (nF)
Figure 6. Response Time vs. Load
Capacitance
Figure 7. I
OUT
Transistor Output Current vs.
V
DD
Supply Voltage
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CAT808
PACKAGE DIMENSIONS
TSOT−23, 5 LEAD
CASE 419AE−01
ISSUE O
SYMBOL
A
A1
A2
b
c
D
E1
E
E
E1
e
L
L1
L2
0.30
0.01
0.80
0.30
0.12
0.15
2.90 BSC
2.80 BSC
1.60 BSC
0.95 TYP
0.40
0.60 REF
0.25 BSC
0.50
0.05
0.87
D
e
MIN
NOM
MAX
1.00
0.10
0.90
0.45
0.20
θ
TOP VIEW
0º
8º
A2 A
q
b
A1
L1
L
c
L2
SIDE VIEW
Notes:
(1) All dimensions are in millimeters. Angles in degrees.
(2) Complies with JEDEC MO-193.
END VIEW
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