CAT808低电压检测芯片
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1
0
2
3
4
5
6
Supply Voltage (V)
2.695
-40
-5
30
65
100
Temperature (ºC)
Response time vs. Load Capacitance
100
10
TPLH
1
0.1
TPHL
0.01
0.000.0000011 0.000.00101 0.000.101 0.0101
(2) 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 VCC +0.5 V, which may overshoot to VCC +2.0 V for periods of less than 20 ns.
2.50
VDD (V)
Battery Voltage
VDD CAT808
OUT GND
IN DC-DC 10kΩ CONVERTER
SHDN OUT
GND
Note: The value of the pull-up resistor is not critical
© 2009 SCILLC. All rights reserved.
only and functional operation of the devices at these or any other conditions outside of those listed in the operational sections of this specification is not implied. Exposure to any absolute maximum rating for extended periods may affect device performance and reliability.
Typical values at TA = 25°C.
VDD Supply Current vs. VDD Supply Voltage
VDET Detection Voltage vs. Temperature
2.71 5
VDET (V)
Supply Current (μA)
4
2.705 3
2 2.7
01.001
100.01
Load capacitance [nF]
IOUT Transistor Output Current vs. VDD Supply Voltage
10.00 8.00 6.00
-40ºC +25ºC
4.00
+90ºC
IOUT (mA)
2.00
0.00
1.00
1.50
2.00
BLOCK DIAGRAM
VDD
VOLTAGE REFERENCE
TIMING DIAGRAM
GND
VDET(MAX) VDET
VDET(MIN)
TPLH
VDD* VOH
VDET(MAX) VDET VDET(MIN)
TPHL
OUT
OUT Slews with VDD
* Voltage of VDD below 1 volt will not be able to maintain low output.
After the CAT808 asserts the output high condition, it continues to monitor VDD until it drops below the detection threshold, when the output goes low until VDD once again exceeds the detection threshold.
VDD = 4.0 V
VDD = 5.0 V
VDD = 6.0 V
VDS = 0.5 V
VDD=1.2 V VDD=2.4 V
VDS = 5.0 V, VDD = 5.0 V
–
Min Typ. Max 2.62 2.7 2.78 3.12 3.2 3.28 3.42 3.5 3.58
- 2.4 5 - 3.5 7 - 5 10 0.6 1.4 2.9 5 - -1 - - 60
(3) Latch-up protection is provided for stresses up to 100 mA on all pins from -1 V to VCC +1 V.
(4) The temperature change ratio in the detection voltage [ppm/°C] is calculated by using the following equation:
PIN FUNCTIONS
Pin VDD GND ¯O¯U¯T¯ NC
Function Voltage Input and Power Supply Ground Pin Active Low Open Drain output No Connect, the pin is electrically open
Symbol Parameter
Conditions
CAT808Nxxx-27
VDET
Detection Voltage
CAT808Nxxx-32
CAT808Nxxx-35
IDD
IOUT ILEAK TPHL/LH Δ - VDET ΔTA ● -VDET
Current Consumption
Output SinkCurrent Output Leakage Current Response Time Detection Voltage Temperature Coefficient(4)
TSOT-23-5 Power Dissipation
SOT-89
Ratings -55 to +125 -65 to +150 -2.0 to VDD + 2.0 -2.0 to 7.0
+300 250 500
Units ºC ºC V V ºC mW mW
Leabharlann Baidu
RECOMMENDED OPERATING CONDITIONS
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 has an active low output that asserts (pulls low) when the supply voltage drops below the detection threshold voltage (VDET). 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, ¯O¯U¯T¯ is held active low until the supply voltage (VDD) rises above VDET. While VDD is above VDET, ¯O¯U¯T¯ stays high until VDD drops below VDET, then ¯O¯U¯T¯ once again goes low.
Δ − VDET ×1,000,000[ppm /º C] ΔTA • -VDET
Doc. No. MD-3024 Rev. E
2
© 2009 SCILLC. All rights reserved.
Characteristics subject to change without notice
OPERATION – VOLTAGE DETECTOR
The CAT808 open-drain output is active low until the VDD voltage exceeds the detection threshold. A low hysteresis is built into the device to minimize output “chatter”, while VDD passes through the detection threshold, and the output transitions high.
For Ordering Information details, see page 7.
PIN CONFIGURATION
TYPICAL APPLICATION
SOT-89 3-Lead
OUT 1 VDD 2 GND 3
Thin SOT-23 5-Lead
OUT 1 VDD 2 GND 3
5 NC 4 NC
compliant packages
APPLICATIONS
Battery-Powered Systems Power Supply Monitoring Handheld and Portable Equipment Processor Supervisor Reset
DESCRIPTION
1
Characteristics subject to change without notice
Doc. No. MD-3024 Rev. E
CAT808
ABSOLUTE MAXIMUM RATINGS (1)
Parameters Temperature under Bias Storage Temperature Voltage on any Pin with Respect to GND(2)(3) VDD with Respect to GND Lead Soldering temperature (10 seconds)
CAT808
OUT
© 2009 SCILLC. All rights reserved.
3
Characteristics subject to change without notice
Doc. No. MD-3024 Rev. E
CAT808
TYPICAL ELECTRICAL OPERATING CHARACTERISTICS
Units V
µA
mA µA µs
- ±10 ±100 ppm/ºC
Notes: (1) Stresses above those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings
Parameters VDD Operating Temperature Range
Ratings +1.2 to +6.0 -40 to +85
Units V ºC
DC ELECTRICAL CHARACTERISTICS
TA = -40ºC to +85ºC, VDD = 1.2V to 6.0V
Low-Power Precision Voltage Detector
CAT808
FEATURES
Ultra Low Current Consumption 2.4 µA 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 and 3-pin SOT-89 RoHS
0
2
3
4
5
6
Supply Voltage (V)
2.695
-40
-5
30
65
100
Temperature (ºC)
Response time vs. Load Capacitance
100
10
TPLH
1
0.1
TPHL
0.01
0.000.0000011 0.000.00101 0.000.101 0.0101
(2) 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 VCC +0.5 V, which may overshoot to VCC +2.0 V for periods of less than 20 ns.
2.50
VDD (V)
Battery Voltage
VDD CAT808
OUT GND
IN DC-DC 10kΩ CONVERTER
SHDN OUT
GND
Note: The value of the pull-up resistor is not critical
© 2009 SCILLC. All rights reserved.
only and functional operation of the devices at these or any other conditions outside of those listed in the operational sections of this specification is not implied. Exposure to any absolute maximum rating for extended periods may affect device performance and reliability.
Typical values at TA = 25°C.
VDD Supply Current vs. VDD Supply Voltage
VDET Detection Voltage vs. Temperature
2.71 5
VDET (V)
Supply Current (μA)
4
2.705 3
2 2.7
01.001
100.01
Load capacitance [nF]
IOUT Transistor Output Current vs. VDD Supply Voltage
10.00 8.00 6.00
-40ºC +25ºC
4.00
+90ºC
IOUT (mA)
2.00
0.00
1.00
1.50
2.00
BLOCK DIAGRAM
VDD
VOLTAGE REFERENCE
TIMING DIAGRAM
GND
VDET(MAX) VDET
VDET(MIN)
TPLH
VDD* VOH
VDET(MAX) VDET VDET(MIN)
TPHL
OUT
OUT Slews with VDD
* Voltage of VDD below 1 volt will not be able to maintain low output.
After the CAT808 asserts the output high condition, it continues to monitor VDD until it drops below the detection threshold, when the output goes low until VDD once again exceeds the detection threshold.
VDD = 4.0 V
VDD = 5.0 V
VDD = 6.0 V
VDS = 0.5 V
VDD=1.2 V VDD=2.4 V
VDS = 5.0 V, VDD = 5.0 V
–
Min Typ. Max 2.62 2.7 2.78 3.12 3.2 3.28 3.42 3.5 3.58
- 2.4 5 - 3.5 7 - 5 10 0.6 1.4 2.9 5 - -1 - - 60
(3) Latch-up protection is provided for stresses up to 100 mA on all pins from -1 V to VCC +1 V.
(4) The temperature change ratio in the detection voltage [ppm/°C] is calculated by using the following equation:
PIN FUNCTIONS
Pin VDD GND ¯O¯U¯T¯ NC
Function Voltage Input and Power Supply Ground Pin Active Low Open Drain output No Connect, the pin is electrically open
Symbol Parameter
Conditions
CAT808Nxxx-27
VDET
Detection Voltage
CAT808Nxxx-32
CAT808Nxxx-35
IDD
IOUT ILEAK TPHL/LH Δ - VDET ΔTA ● -VDET
Current Consumption
Output SinkCurrent Output Leakage Current Response Time Detection Voltage Temperature Coefficient(4)
TSOT-23-5 Power Dissipation
SOT-89
Ratings -55 to +125 -65 to +150 -2.0 to VDD + 2.0 -2.0 to 7.0
+300 250 500
Units ºC ºC V V ºC mW mW
Leabharlann Baidu
RECOMMENDED OPERATING CONDITIONS
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 has an active low output that asserts (pulls low) when the supply voltage drops below the detection threshold voltage (VDET). 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, ¯O¯U¯T¯ is held active low until the supply voltage (VDD) rises above VDET. While VDD is above VDET, ¯O¯U¯T¯ stays high until VDD drops below VDET, then ¯O¯U¯T¯ once again goes low.
Δ − VDET ×1,000,000[ppm /º C] ΔTA • -VDET
Doc. No. MD-3024 Rev. E
2
© 2009 SCILLC. All rights reserved.
Characteristics subject to change without notice
OPERATION – VOLTAGE DETECTOR
The CAT808 open-drain output is active low until the VDD voltage exceeds the detection threshold. A low hysteresis is built into the device to minimize output “chatter”, while VDD passes through the detection threshold, and the output transitions high.
For Ordering Information details, see page 7.
PIN CONFIGURATION
TYPICAL APPLICATION
SOT-89 3-Lead
OUT 1 VDD 2 GND 3
Thin SOT-23 5-Lead
OUT 1 VDD 2 GND 3
5 NC 4 NC
compliant packages
APPLICATIONS
Battery-Powered Systems Power Supply Monitoring Handheld and Portable Equipment Processor Supervisor Reset
DESCRIPTION
1
Characteristics subject to change without notice
Doc. No. MD-3024 Rev. E
CAT808
ABSOLUTE MAXIMUM RATINGS (1)
Parameters Temperature under Bias Storage Temperature Voltage on any Pin with Respect to GND(2)(3) VDD with Respect to GND Lead Soldering temperature (10 seconds)
CAT808
OUT
© 2009 SCILLC. All rights reserved.
3
Characteristics subject to change without notice
Doc. No. MD-3024 Rev. E
CAT808
TYPICAL ELECTRICAL OPERATING CHARACTERISTICS
Units V
µA
mA µA µs
- ±10 ±100 ppm/ºC
Notes: (1) Stresses above those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings
Parameters VDD Operating Temperature Range
Ratings +1.2 to +6.0 -40 to +85
Units V ºC
DC ELECTRICAL CHARACTERISTICS
TA = -40ºC to +85ºC, VDD = 1.2V to 6.0V
Low-Power Precision Voltage Detector
CAT808
FEATURES
Ultra Low Current Consumption 2.4 µA 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 and 3-pin SOT-89 RoHS