SG3546LP [MICROSEMI]
3.3 V UNDERVOLTAGE SENSING CIRCUIT; 3.3 V欠压检测电路
| 型号： | SG3546LP |
| 厂家： | 
Microsemi |
| 描述： | 3.3 V UNDERVOLTAGE SENSING CIRCUIT |
| 文件： | 总7页 (文件大小：158K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
LIN DOC #: 3546
SG3546
3 . 3 V U N D E R V O L T A G E S E N S I N G C I R C U I T
P R O D U C T I O N D A T A S H E E T
T H E I N F I N I T E P O W E R O F I N N O V A T I O N
DESCRIPTION
KEY FEATURES
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■
■
LOW STANDBY CURRENT
The SG3546 is an undervoltage sensing
circuit specifically designed for use as
a reset controller in 3.3V
microprocessor-based applications. Its
micropower operation makes this
device ideal for portable applications
where extended battery life is required.
The device offers a 1.2V temperature
compensated bandgap reference, a
precision comparator with hysteresis
INTERNAL VOLTAGE THRESHOLD AT 2.95V
and a high-current open collector
output. This device operates from 1 to
10V input supply and drains <10µA in
the non-fault condition.
The SG3546 is available in an 8-pin
150mil SOIC package or a 3-pin TO-92
package and is rated for an ambient
temperature of 0°C to 70°C.
TEMPERATURE COMPENSATED BANDGAP
REFERENCE
■
■
■
PRECISION COMPARATOR WITH 40MV OF
HYSTERESIS
CLAMP DIODE FOR DISCHARGING DELAY
CAPACITOR
OUTPUT CURRENT SINK CAPABILITY
(typ 5mA)
PRODUCT HIGHLIGHT
■
■
1-10V INPUT SUPPLY RANGE
AVAILABLE IN 150MIL, 8-PIN SOIC AND
3-PIN TO-92 PACKAGES
LOW-VOLTAGE MICROPROCESSOR RESET
2
R
1
RESET
MICROPROCESSOR
CIRCUIT
POWER
SUPPLY
CDLY
1.2 VREF
3
PACKAGE ORDER INFORMATION
Plastic SOIC
8-pin
Plastic TO-92
3-pin
TA (°C)
DM
LP
0 to 70
SG3546DM
SG3546LP
Note: All surface-mount packages are available in Tape & Reel.
Append the letter "T" to part number. (i.e. SG3546DMT)
F O R F U R T H E R I N F O R M AT I O N C A L L ( 7 1 4 ) 8 9 8 - 8 1 2 1
Copyright © 1994
Rev. 1.3 1/96
1
11861 WESTERN AVENUE, GARDEN GROVE, CA. 92841
P R O D U C T D A T A B O O K 1 9 9 6 / 1 9 9 7
SG3546
3 . 3 V U N D E R V O L T A G E
S
E N S I N G
C
I R C U I T
P R O D U C T I O N D A T A S H E E T
ABSOLUTE MAXIMUM RATINGS (Note 1)
PACKAGE PIN OUTS
Input Supply Voltage (VIN)............................................................................... -1V to 12V
RESET Output Voltage (VOUT) ..........................................................................-1V to 12V
Clamp Diode Forward Current .............................................................................. 100mA
Operating Junction Temperature
N.C.
N.C.
N.C.
N.C.
RESET
INPUT
N.C.
1
2
3
4
8
7
6
5
GROUND
Plastic (DM - Package) ......................................................................................... 150°C
Storage Temperature Range......................................................................-65°C to 150°C
Lead Temperature (Soldering, 10 seconds)............................................................ 300°C
DM PACKAGE
(Top View)
Note 1. Values beyond which damage may occur. All voltages are specified with respect to
ground, and all currents are positive into the specified terminal.
3. GROUND
2. INPUT
THERMAL DATA
1. RESET
DM PACKAGE:
THERMAL RESISTANCE-JUNCTION TO AMBIENT, θJA
LP PACKAGE:
165°C/W
156°C/W
LP PACKAGE
(Top View)
THERMAL RESISTANCE-JUNCTION TO AMBIENT, θJA
Junction Temperature Calculation: TJ = TA + (PD x θJA).
The θJA numbers are guidelines for the thermal performance of the device/pc-board system.
All of the above assume no ambient airflow.
BLOCK DIAGRAM
INPUT
2
RESET
1
1.2 VREF
4
GROUND
Copyright © 1994
Rev. 1.3 2/96
2
P R O D U C T D A T A B O O K 1 9 9 6 / 1 9 9 7
SG3546
3 . 3 V U N D E R V O L T A G E S E N S I N G C I R C U I T
P R O D U C T I O N D A T A S H E E T
RECOMMENDED OPERATING CONDITIONS
(Note 2)
Recommended Operating Conditions
Parameter
Symbol
Units
Min.
Typ.
Max.
Input Supply Voltage
RESET Output Voltage
1
10
10
50
V
V
Clamp Diode Forward Current
Operating Ambient Temperature Range:
SG3546
mA
TA
0
70
°C
Note 2. Range over which the device is guaranteed functional.
ELECTRICAL CHARACTERISTICS
(Unless otherwise specified, these specifications apply over the operating ambient temperatures of 0°C ≤ TA ≤ 70°C for the SG3546. Low duty cycle
pulse testing techniques are used which maintains junction and case temperatures equal to the ambient temperature.)
SG3546
Min. Typ.
Parameter
Total Device
Symbol
Test Conditions
Units
Max.
1.0
10
19
10
20
50
V
Operating Input Voltage Range
Quiescent Input Current
VIN
IIN
µA
µA
VIN = 3.3V
VIN = 10V
Comparator Section
Threshold Voltage
High-State Output
Low-State Output
Hysteresis
2.75
2.75
2.81
2.86
40
3.0
3.0
V
V
mV
VIH
VIL
VH
VIN Increasing
VIN Decreasing
RESET Output Section
Output Sink Saturation
VOL
VIN = 2.6V, ISINK = 1mA
VIN = 1.0V, ISINK = 100µA
VIN , RESET = 2.6V
0.05
0.06
0.40
0.30
20
V
V
mA
µA
µA
V
Output Sink Current
ISINK
Output Off-State Leakage
VIN , RESET = 3.6V
VIN , RESET = 10V
Pin 1 to pin 2, (IF = 5.0mA)
0.5
2.0
Clamp Diode Forward Voltage
VF
0.5
1.2
Copyright © 1994
Rev. 1.3 2/96
3
P R O D U C T D A T A B O O K 1 9 9 6 / 1 9 9 7
SG3546
3 . 3 V U N D E R V O L T A G E
S
E N S I N G
C
I R C U I T
P R O D U C T I O N D A T A S H E E T
GRAPH / CURVE INDEX
FIGURE INDEX
Characteristic Curves
Application Circuits
FIGURE #
FIGURE #
1. COMPARATOR THRESHOLD VOLTAGE vs. TEMPERATURE
2. RESET OUTPUT VOLTAGE vs. INPUT VOLTAGE
3. RESET OUTPUT SATURATION vs. SINK CURRENT
4. INPUT CURRENT vs. INPUT VOLTAGE
7. SWITCHING THE LOAD OFF WHEN BATTERY REACHES BELOW VTH
8. LOW VOLTAGE MICROPROCESSOR RESET
9. VOLTAGE MONITOR
5. RESET DELAY TIME (LOW to HIGH)
6. RESET DELAY TIME (HIGH to LOW)
Copyright © 1994
Rev. 1.3 2/96
4
P R O D U C T D A T A B O O K 1 9 9 6 / 1 9 9 7
SG3546
3 . 3 V U N D E R V O L T A G E S E N S I N G C I R C U I T
P R O D U C T I O N D A T A S H E E T
CHARACTERISTIC CURVES
FIGURE 1. — COMPARATOR THRESHOLD VOLTAGE
vs. TEMPERATURE
FIGURE 2. — RESET OUTPUT VOLTAGE
vs. INPUT VOLTAGE
RL = 43K to VIN
3.050
3.000
2.950
2.900
2.850
2.800
2.750
RL = 82K to VIN
4
TA = 25°C
3
2
1
0
0
1
2
3
4
5
-50
-25
0
25
50
75
100 125
Junction Temperature - (°C)
Input Voltage - (V)
FIGURE 3. — RESET OUTPUT SATURATION
FIGURE 4. — INPUT CURRENT vs. INPUT VOLTAGE
vs. SINK CURRENT
RL = ¥
TA = 25°C
70
VIN = 3V
TA = 25°C
300
60
50
40
30
20
200
100
0
10
0
0
3
6
9
12
14
0
0.5
1
1.5
2
2.5
3
3.5
4
(ISINK) Sink Current - (mA)
Input Voltage - (V)
Copyright © 1994
Rev. 1.3 2/96
5
P R O D U C T D A T A B O O K 1 9 9 6 / 1 9 9 7
SG3546
3 . 3 V U N D E R V O L T A G E
S
E N S I N G
C
I R C U I T
P R O D U C T I O N D A T A S H E E T
CHARACTERISTIC CURVES
FIGURE 5. — RESET DELAY TIME (LOW TO HIGH)
FIGURE 6. — RESET DELAY TIME (HIGH TO LOW)
VIN
VIN
43K
RESET
43K
RESET
3.3V
2.7V
3.3V
2.7V
REF
REF
100%
3.3V
100%
3.3V
2.7V
0%
2.7V
VIN = 3.3V to 2.6V
RL = 43K
TA = 25°C
VIN = 4.0V to 5.0V
RL = 43K
0%
TA = 25°C
2µs/DIV.
0.5µs/DIV.
Copyright © 1994
Rev. 1.3 2/96
6
P R O D U C T D A T A B O O K 1 9 9 6 / 1 9 9 7
SG3546
3 . 3 V U N D E R V O L T A G E S E N S I N G C I R C U I T
P R O D U C T I O N D A T A S H E E T
TYPICAL APPLICATION CIRCUITS
2
R
1
RESET MICROPROCESSOR
CIRCUIT
POWER
SUPPLY
CDLY
LOAD
2
1
RESET
1.2 VREF
3
1.2 VREF
A time-delayed reset can be accomplished with the addition of CDLY
For systems with extremely fast power supply rise times (< 500ns),
it is recommended that the RCDLY time constant be greater than
5.0µs. VTH(MPU) is the microprocessor reset input threshold.
.
4
1
VTH(MPU)
VIN
tDLY = R CDLY In
1 -
FIGURE 7. — SWITCHING THE LOAD OFF WHEN
FIGURE 8. — LOW VOLTAGE MICROPROCESSOR RESET
BATTERY VOLTAGE REACHES BELOW VTH
1.0k
2
1
POWER
SUPPLY
RESET
1.2 VREF
3
FIGURE 9. — VOLTAGE MONITOR
Copyright © 1994
Rev. 1.3 2/96
7
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