Intersil Corporation ICL7673 Datasheet
ICL7673
Data Sheet April 1999
Automatic Battery Back-Up Switch
The Intersil ICL7673 is a monolithic CMOS battery backup
circuit that offers unique performance advantages over
conventional means of switching to a backup supply. The
ICL7673 is intended as a low-cost solution for the switching
of systems between two power supplies; main and battery
backup. The main application is keep-alive-battery power
switching for use in volatile CMOS RAM memory systems
and real time clocks. In many applications this circuit will
represent a low insertion voltage loss between the supplies
and load. This circuit featureslowcurrentconsumption,wide
operating voltage range, and exceptionally low leakage
between inputs. Logic outputs are provided that can be used
to indicate which supply is connected and can also be used
to increase the power switching capability of the circuit by
driving external PNP transistors.
Ordering Information
PART
NUMBER
ICL7673CPA 0 to 70 8 Ld PDIP8 E8.3
ICL7673CBA 0 to 70 8 Ld SOIC (N) M8.15
ICL7673ITV 25 to 85 8 Ld Metal Can T8.C
TEMP. RANGE
(oC) PACKAGE PKG. NO.
Pinouts
ICL7673 (SOIC, PDIP)
TOP VIEW
File Number
3183.2
Features
• Automatically Connects Output to the Greater of Either
Input Supply Voltage
• If Main Power to External Equipment is Lost, Circuit Will
Automatically Connect Battery Backup
• Reconnects Main Power When Restored
• Logic Indicator Signaling Status of Main Power
• Low Impedance Connection Switches
• Low Internal Power Consumption
• Wide Supply Range:. . . . . . . . . . . . . . . . . . . . 2.5V to 15V
• Low Leakage Between Inputs
• External Transistors May Be Added if Very Large
Currents Need to Be Switched
Applications
• On Board Battery Backup for Real-Time Clocks,
Timers, or Volatile RAMs
• Over/Under Voltage Detector
• Peak Voltage Detector
• Other Uses:
- Portable Instruments, Portable Telephones, Line
Operated Equipment
Functional Block Diagram
V
V
S
BAR
GDN
V
S
SBAR
O
S
V
O
1
2
3
4
ICL7673 (CAN)
TOP VIEW
V
P
8
1
2
3
4
GND
3-81
V
8
V
P
7
NC
6
P
BAR
5
NC
P
V
S
P1
P2
V
S
O
BAR
-
+
7
NC
GND
PBAR
6
VP > VS, P1 SWITCH ON AND P
5
NC
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
http://www.intersil.com or 407-727-9207
VS > VP, P2 SWITCH ON AND S
| Copyright © Intersil Corporation 1999
SWITCH ON
BAR
SWITCH ON
BAR
P
BAR
ICL7673
Absolute Maximum Ratings Thermal Information
Input Supply (VP or VS) Voltage . . . . . . . . . . . .GND - 0.3V to +18V
Output Voltages P
BAR
and S
. . . . . . . . . . .GND - 0.3V to +18V
BAR
Peak Current
Input VP (at VP = 5V) (Note 1) . . . . . . . . . . . . . . . . . . . . . . . 38mA
Input VS (at VS = 3V) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30mA
P
BAR
or S
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 150mA
BAR
Operating Conditions
Temperature Range:
ICL7673C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .0oC to 70oC
ICL7673I. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -25oC to 85oC
CAUTION: Stresses above those listed in “Absolute Maximum Ratings” may cause permanent damage to the device. This is a stress only rating and operationofthe
device at these or any other conditions above those indicated in the operational sections of this specification is not implied.
NOTES:
1. Derate above 25oC by 0.38mA/oC.
2. θJA is measured with the component mounted on an evaluation PC board in free air.
Thermal Resistance (Typical, Note 2) θJA(oC/W) θJC(oC/W)
PDIP Package . . . . . . . . . . . . . . . . . . . 150 N/A
Plastic SOIC Package . . . . . . . . . . . . . 180 N/A
Metal Can. . . . . . . . . . . . . . . . . . . . . . . 156 68oC/W
Maximum Storage Temperature. . . . . . . . . . . . . . . . -65oC to 150oC
Maximum Lead Temperature (Soldering, 10sec). . . . . . . . . . .300oC
(SOIC - Lead Tips Only)
Electrical Specifications T
= 25oC Unless Otherwise Specified
A
PARAMETER SYMBOL TEST CONDITIONS MIN TYP MAX UNITS
Input Voltage V
V
P
S
VS = 0V, I
VP = 0V, I
= 0mA 2.5 - 15 V
LOAD
= 0mA 2.5 - 15 V
LOAD
Quiescent Supply Current I+ VP = 0V, VS = 3V, I
Switch Resistance P1 (Note 1) r
P1 VP = 5V, VS = 3V, I
DS(ON)
At TA = +85oC - 16 - Ω
VP = 9V, VS = 3V, I
VP = 12V, VS = 3V, I
Temperature Coefficient of Switch Re-
T
C(P1)
VP = 5V, VS = 3v, I
sistance P1
Switch Resistance P2 (Note 1) r
P2 VP = 0V, VS = 3V, I
DS(ON)
At TA = +85oC - 60 - Ω
VP = 0V, VS = 5V, I
VP = 0V, VS = 9V, I
Temperature Coefficient of Switch Re-
T
C(P2)
VP = 0V, VS = 3V, I
sistance P2
Leakage Current (VP to VS)I
L(PS)
VP = 5V, VS = 3V, I
At TA = +85oC - 35 - nA
Leakage Current (VP to VS)I
L(SP)
VP = 0V, VS = 3V, I
at TA = +85oC - 120 - nA
Open Drain Output Saturation Voltages V
OPBARVP
= 5V, VS = 3V, I
At TA = 85oC - 120 - mV
VP = 9V, VS = 3V, I
VP = 12V, VS = 3V, I
I
= 0mA
LOAD
= 0mA - 1.5 5 µA
LOAD
= 15mA - 8 15 Ω
LOAD
= 15mA - 6 - Ω
LOAD
= 15mA - 5 - Ω
LOAD
= 15mA - 0.5 - %/oC
LOAD
= 1mA - 40 100 Ω
LOAD
= 1mA - 26 - Ω
LOAD
= 1mA - 16 - Ω
LOAD
= 1mA - 0.7 - %/oC
LOAD
= 10mA - 0.01 20 nA
LOAD
= 10mA - 0.01 50 nA
LOAD
SINK
SINK
SINK
= 3.2mA, I
= 3.2mA, I
= 3.2mA
= 0mA - 85 400 mV
LOAD
= 0mA - 50 - mV
LOAD
-40- mV
3-82
ICL7673
Electrical Specifications T
= 25oC Unless Otherwise Specified (Continued)
A
PARAMETER SYMBOL TEST CONDITIONS MIN TYP MAX UNITS
Open Drain Output Saturation Voltages V
OSBARVP
= 0V, VS = 3V, I
SINK
= 3.2mA, I
= 0mA - 150 400 mV
LOAD
at TA = +85oC - 210 - mV
Output Leakage Currents of P
S
BAR
BAR
and
I
LPBAR
I
LSBAR
VP = 0V, VS = 5V, I
VP = 0V, VS = 9V, I
VP = 0V, VS = 15V, I
at TA = +85oC - 900 - nA
VP = 15V, VS = 0V, I
= 3.2mA I
SINK
= 3.2mA I
SINK
= 0mA - 50 500 nA
LOAD
= 0mA - 50 500 nA
LOAD
= 0mA - 85 - mV
LOAD
= 0mA - 50 - mV
LOAD
at TA = +85oC - 900 - nA
Switchover Uncertainty for Complete
VP - VSVS = 3V, I
SINK
= 3.2mA, I
= 15mA - ±10 ±50 mV
LOAD
Switching of Inputs and Open Drain
Outputs
NOTE:
3. The Minimum input to output voltage can be determined by multiplying the load current by the switch resistance.
Typical Performance Curves
100
I
LOAD
= 15mA
100
I
= 1mA
LOAD
10
ON-RESISTANCE P1 (Ω)
1
02 46810121416
INPUT VOLTAGE VP (V)
FIGURE1. ON-RESISTANCE SWITCH P1AS A FUNCTIONOF
INPUT VOLTAGE V
P
10
ON-RESISTANCE P2 (Ω)
1
0246810
INPUT VOLTAGE V
S
FIGURE2. ON-RESISTANCE SWITCH P2AS A FUNCTIONOF
INPUT VOLTAGE V
S
3-83
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