View SG3546_4715097.PDF datasheet online --- IC-ON-LINE

Datasheet File OCR Text:

SG3546
3.3V UNDERVOLTAGE SENSING CIRCUIT
T
HE
I
NFINITE
P
OWER
OF
I
NNOVATION
P
RODUCTION
D
ATA
S
HEET
DESCRIPTION
KEY FEATURES
LOW STANDBY CURRENT INTERNAL VOLTAGE THRESHOLD AT 2.95V TEMPERATURE COMPENSATED BANDGAP REFERENCE PRECISION COMPARATOR WITH 40MV OF HYSTERESIS CLAMP DIODE FOR DISCHARGING DELAY CAPACITOR OUTPUT CURRENT SINK CAPABILITY (typ 5mA) 1-10V INPUT SUPPLY RANGE AVAILABLE IN 150MIL, 8-PIN SOIC AND 3-PIN TO-92 PACKAGES
The SG3546 is an undervoltage sensing circuit specifically designed for use as a reset controller in 3.3V microprocessorbased 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 and a high-current open collector output. This device operates from 1 to 10V input supply and drains <10A in the nonfault 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 0C to 70C.
IMPORTANT: For the most current data, consult MICROSEMI's website: http://www.microsemi.com
PRODUCT HIGHLIGHT
LOW-VOLTAGE MICROPROCESSOR RESET
2 1 POWER SUPPLY R RESET CDLY MICROPROCESSOR CIRCUIT
1.2 VREF
3
TA (C)
PACKAGE ORDER INFO Plastic SOIC Plastic TO-92 DM 8-Pin LP 3-Pin
RoHS Compliant / Pb-free Transition DC: 0440 RoHS Compliant / Pb-free Transition DC: 0509
0 to 70
SG3546DM
SG3546LP
Note: Available in Tape & Reel. Append the letters "TR" to the part number. (i.e. LX3546DM-TR)
Copyright (c) 1994 Rev. 1.3a,2005-03-09
LINFINITY MICROELECTRONICS INC.
11861 WESTERN AVENUE, GARDEN GROVE, CA. 92841, 714-898-8121, FAX: 714-893-2570
1
PRODUCT DATABOOK 1996/1997
SG3546
3 . 3 V U N D E R V O LT A G E S E N S I N G C I R C U I T
P
RODUCTION
D
ATA
S
HEET
A B S O L U T E M A X I M U M R AT I N G S
(Note 1)
PACKAGE PIN OUTS
RESET INPUT N.C. GROUND 1 2 3 4 8 7 6 5 N.C. N.C. N.C. N.C.
Input Supply Voltage (VIN)............................................................................... -1V to 12V RESET Output Voltage (VOUT) .......................................................................... -1V to 12V Clamp Diode Forward Current .............................................................................. 100mA Operating Junction Temperature Plastic (DM - Package) ......................................................................................... 150C Storage Temperature Range ...................................................................... -65C to 150C Lead Temperature (Soldering, 10 seconds) ............................................................ 300C
Peak Package Solder Reflow Temp. (40 second max. exposure).......................................260C (+0, -5) 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.
DM PACKAGE (Top View)
3. GROUND
T H E R M A L D ATA
DM PACKAGE: THERMAL RESISTANCE-JUNCTION TO AMBIENT, JA LP PACKAGE: THERMAL RESISTANCE-JUNCTION TO AMBIENT, JA 156C/W Junction Temperature Calculation: TJ = T A + (PD x JA). The JA numbers are guidelines for the thermal performance of the device/pc-board system. All of the above assume no ambient airflow. 165C/W
2. INPUT 1. RESET
LP PACKAGE (Top View)
RoHS / Pb-free 100% Matte Tin Lead Finish
BLOCK DIAGRAM
INPUT 2 RESET 1
1.2 VREF
4 GROUND
2
Copyright (c) 1994 Rev. 1.3a 10/14
PRODUCT DATABOOK 1996/1997
SG3546
3 . 3 V U N D E R V O LTA G E S E N S I N G C I R C U I T
P
RODUCTION
D
ATA
S
HEET
R E C O M M E N D E D O P E R AT I N G C O N D I T I O N S Parameter
Input Supply Voltage RESET Output Voltage Clamp Diode Forward Current Operating Ambient Temperature Range: SG3546 Note 2. Range over which the device is guaranteed functional.
(Note 2)
Symbol
Recommended Operating Conditions Min. Typ. Max.
1 10 10 50 70
Units
V V mA C
TA
0
ELECTRICAL CHARACTERISTICS
(Unless otherwise specified, these specifications apply over the operating ambient temperatures of 0C T A 70C for the SG3546. Low duty cycle pulse testing techniques are used which maintains junction and case temperatures equal to the ambient temperature.)
Parameter Total Device
Operating Input Voltage Range Quiescent Input Current
Symbol
Test Conditions
Min.
1.0
SG3546 Typ. Max.
10 20 50
Units
V A A
VIN IIN
VIN = 3.3V VIN = 10V
10 19
Comparator Section
Threshold Voltage High-State Output Low-State Output Hysteresis VIH VIL VH VOL I SINK VIN Increasing VIN Decreasing 2.75 2.75 2.81 2.86 40 0.05 0.06 3.0 3.0 V V mV V V mA A A V
RESET Output Section
Output Sink Saturation Output Sink Current Output Off-State Leakage Clamp Diode Forward Voltage VIN = 2.6V, ISINK = 1mA VIN = 1.0V, ISINK = 100A VIN , RESET = 2.6V VIN , RESET = 3.6V VIN , RESET = 10V Pin 1 to pin 2, (IF = 5.0mA) 0.40 0.30 20 0.5 2.0 1.2
VF
0.5
Copyright (c) 1994 Rev. 1.3a 10/14
3
PRODUCT DATABOOK 1996/1997
SG3546
3 . 3 V U N D E R V O LT A G E S E N S I N G C I R C U I T
P
RODUCTION
D
ATA
S
HEET
GRAPH / CURVE INDEX
FIGURE INDEX
Characteristic Curves
FIGURE # 1. 2. 3. 4. 5. 6. COMPARATOR THRESHOLD VOLTAGE vs. TEMPERATURE RESET OUTPUT VOLTAGE vs. INPUT VOLTAGE RESET OUTPUT SATURATION vs. SINK CURRENT INPUT CURRENT vs. INPUT VOLTAGE RESET DELAY TIME (LOW to HIGH) RESET DELAY TIME (HIGH to LOW) FIGURE # 7. 8. 9.
Application Circuits
SWITCHING THE LOAD OFF WHEN BATTERY REACHES BELOW VTH LOW VOLTAGE MICROPROCESSOR RESET VOLTAGE MONITOR
4
Copyright (c) 1994 Rev. 1.3a 10/14
PRODUCT DATABOOK 1996/1997
SG3546
3 . 3 V U N D E R V O LTA G E S E N S I N G C I R C U I T
P
RODUCTION
D
ATA
S
HEET
C H A R A C T E R I S T I C C U RV E S
FIGURE 1. -- COMPARATOR THRESHOLD VOLTAGE vs. TEMPERATURE
RL = 43K to VIN
3.050
FIGURE 2. -- RESET OUTPUT VOLTAGE vs. INPUT VOLTAGE
4
Threshold Voltage - (V)
3.000 2.950 2.900 2.850 2.800 2.750 0 -50 -25 0 25 50 75 100 125 0
RL = 82K to VIN TA = 25C
Output Voltage - (V)
3
2
1
1
2
3
4
5
Junction Temperature - (C)
Input Voltage - (V)
FIGURE 3. -- RESET OUTPUT SATURATION vs. SINK CURRENT
FIGURE 4. -- INPUT CURRENT vs. INPUT VOLTAGE
70
RL = TA = 25C
(VOL) Output Saturation - (mV)
300
Input Current - (A)
6 9 12 14
VIN = 3V TA = 25C
60 50 40 30 20 10
200
100
0 0 3
0 0 0.5 1 1.5 2 2.5 3 3.5 4
(ISINK) Sink Current - (mA)
Input Voltage - (V)
Copyright (c) 1994 Rev. 1.3a 10/14
5
PRODUCT DATABOOK 1996/1997
SG3546
3 . 3 V U N D E R V O LT A G E S E N S I N G C I R C U I T
P
RODUCTION
D
ATA
S
HEET
CHARACTERISTIC CURVES
FIGURE 5. -- RESET DELAY TIME (LOW TO HIGH)
FIGURE 6. -- RESET DELAY TIME (HIGH TO LOW)
VIN
VIN 3.3V 2.7V 43K RESET
3.3V 2.7V
43K RESET
REF
REF
100% 3.3V
100% 3.3V
2.7V
2.7V
0%
VIN = 3.3V to 2.6V RL = 43K TA = 25C
0%
VIN = 4.0V to 5.0V RL = 43K TA = 25C
2s/DIV.
0.5s/DIV.
6
Copyright (c) 1994 Rev. 1.3a 10/14
PRODUCT DATABOOK 1996/1997
SG3546
3 . 3 V U N D E R V O LTA G E S E N S I N G C I R C U I T
P
RODUCTION
D
ATA
S
HEET
T Y P I C A L A P P L I C AT I O N C I R C U I T S
2 1 POWER SUPPLY
R RESET CDLY MICROPROCESSOR CIRCUIT
2 1 RESET
LOAD
1.2 VREF
3
1.2 VREF
4
A time-delayed reset can be accomplished with the addition of C DLY. For systems with extremely fast power supply rise times (< 500ns), it is recommended that the RCDLY time constant be greater than 5.0s. VTH(MPU) is the microprocessor reset input threshold.
tDLY = R CDLY In
1 VTH(MPU) 1- V IN
FIGURE 7. -- SWITCHING THE LOAD OFF WHEN BATTERY VOLTAGE REACHES BELOW VTH
FIGURE 8. -- LOW VOLTAGE MICROPROCESSOR RESET
1.0k 2 1 POWER SUPPLY RESET
1.2 VREF
3
FIGURE 9. -- VOLTAGE MONITOR
Copyright (c) 1994 Rev. 1.3a 10/14
7

▲Up To Search▲

Price & Availability of SG3546

	To Download SG3546 Datasheet File
If you can't view the Datasheet, Please click here to try to view without PDF Reader .