Intersil Corporation ICL7673CBA, ICL7673CPA, ICL7673ITV Datasheet

TM

R

R

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 me ans 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 appli cation is keep-al ive-battery power
switching for use in volatile CMOS RAM memory systems
and real time clocks. In many applications this circuit wi ll
represent a low insertion voltage loss between the supplies
and load. Thi s cir cuit feat ur es low cu rrent cons umption, wide
operating voltage range, and exce ptionally low leaka ge
between inputs. Lo gic output s are provi ded that c an be used
to indicate which supply is connected and can al so 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
ICL7673ITV 25 to 8 5

TEMP. RANGE

o

(

C) PACKAGE PKG. NO.

to 70 8 Ld SOIC (N) M8.15

8 Ld Metal Can T8.C

Pinouts

ICL7673 (SOIC, PDIP)

TOP VIEW

FN3183.2

Features

• Automatically Connects Output to the Greater of Either
Input Sup ply Volt a ge

• If Main Power to External Equipment is Lost, Circuit Will
Automatically Connect Battery Backup

• Reconnects Main Power When Restored

• Logic Indicator Sig naling St atus of Main Power

• Low Impedance Connection Switches

• Low Internal Power Consumption

• Wide Supply Range: . . . . . . . . . . . . . . . . . . . 2.5V to 15V

• Low Leakage Between Inputs

• External Tr ansistors May Be Added if Very Large
Currents Need to Be Switched

Applications

• On Board Battery Backup for Real-Time Clocks,
Timers, or Volati le RAMs

• Over/Under Voltage Detector

• Peak Vol tage Detector

•Other Uses:

- Portable Instruments , Por table Tel ephones, Line

Operated Equipment

Functional Block Diagram

V
V

S

BAR

GDN

V

S

SBAR

1

O

2

S

3
4

ICL7673 (CAN)

TOP VIEW

V

1

O

2

3

V

P

8

4

GND

3-81

V

8

V

P

7

NC

6

P

BAR

5

NC

P

V

S

P1

P2

V

O

S

BA

-

+

NC

7

GND

PBAR

6

VP > VS, P1 SWITCH ON AND P

NC

5

CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.

1-888-INTERSIL or 321-724-7143

V

> VP, P2 SWITCH ON AND S

S

| Intersil (and design) is a trademark of Intersil Americas Inc.

Copyright © Intersil Americas Inc. 2002. All Rights Reserved

SWITCH ON

BAR

SWITCH ON

BAR

P

BA

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 V
Input V
P

(at VP = 5V) (Note 1) . . . . . . . . . . . . . . . . . . . . . . . 38mA

P

(at VS = 3V) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30mA

S

BAR

or S

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 150mA

BAR

Thermal Resistance (Typical, Note 2) θ

PDIP Package . . . . . . . . . . . . . . . . . . . 150 N/A

Plastic SOIC Package . . . . . . . . . . . . . 180 N/A

Metal Can. . . . . . . . . . . . . . . . . . . . . . . 156 68

Maximum Storage Temperature. . . . . . . . . . . . . . . . -65

Maximum Lead T emperature (Soldering, 10sec). . . . . . . . . . .300

(SOIC - Lead Tips Only)

Operating C o ndi t io ns

Temperature Range:

ICL7673C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0

ICL7673I. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -25

CAUTION: Stresses abo ve thos e lis ted in “A bsolut e Ma xi mum Rati ngs” may c ause perma nent damag e to the dev ice. T hi s is a stress onl y rating and operation of the
device at these or any other conditions above those indicated in the operational sections of this specification is not implied.

NOTES:

o

1. Derate above 25
is measured with t he compon ent mounted on an evaluation PC board in free air.

2. θ

JA

C by 0.38mA/oC.

o

C to 70oC

o

C to 85oC

(oC/W) θ

JA

(oC/W)

JC

o

C/W

o

C to 150oC

o

C

Electrical Specifications T

= 25oC Unle ss Otherwise S pecified

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 Sup pl y C urr e nt I+ VP = 0V, VS = 3V, I
Switch Resistance P1 (Note 1) r

P1 VP = 5V, VS = 3V, I

DS(ON)

At T

= +85oC-16-Ω

A

VP = 9V, VS = 3V, I
V

= 12V, VS = 3V, I

P

Temperature Coefficient of Swit ch Re­sistance P1

Switch Resistance P2 (Note 1) r

T

C(P1)

DS(ON)

VP = 5V, VS = 3v, I

P2 VP = 0V, VS = 3V, I

At T

= +85oC-60-Ω

A

VP = 0V, VS = 5V, I
V

= 0V, VS = 9V, I

P

Temperature Coefficient of Swit ch Re­sistance P2

Leakage Current (V

to VS)I

P

Leakage Current (VP to VS)I

Open Drai n Out pu t Sa tu rat i on Vo lt ag es V

T

C(P2)

L(PS)

L(SP)

OPBARVP

VP = 0V, VS = 3V, I

VP = 5V, VS = 3V, I
At T

= +85oC-35-nA

A

VP = 0V, VS = 3V, I
at T

= + 85oC-120-nA

A

= 5V, VS = 3V, I
At TA = 85oC-120-mV
V

= 9V, VS = 3V, I

P

V

= 12V, VS = 3V, I

P

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 Unle ss Otherwise S pecified (Continued)

A

PARAMETER SYMBOL TEST CONDITIONS MIN TYP MAX UNITS

Open Drai n Out pu t Sa tu rat i on Vo lt ag es V

Output Leakage Currents of P
S

BAR

BAR

and

Switchover Uncertainty for Complete
Switch ing of Inputs and Open Drain

OSBARVP

I

LPBARVP

I

LSBARVP

V

- VSVS = 3V, I

P

= 0V, VS = 3V, I
at T

= + 85oC-210-mV

A

VP = 0V, VS = 5V, I
V

= 0V, VS = 9V, I

P

= 0V, VS = 15V, I

= 3.2mA, I

SINK

= 3.2mA I

SINK

= 3.2mA I

SINK

= 0mA - 50 500 nA

LOAD

= 0mA - 150 400 mV

LOAD

= 0mA - 85 - mV

LOAD

= 0mA - 50 - mV

LOAD

at TA = + 85oC-900-nA

= 15V, VS = 0V, I
at T

= + 85oC-900-nA

A

= 3.2mA, I

SINK

= 0mA - 50 500 nA

LOAD

= 15mA - ±10 ±50 mV

LOAD

Outputs

NOTE:

3. The Minimum input to output volt age can be determined by mult iplying the load current by the switch resistance.

Typical Performance Curves

100

I

LOAD

= 15mA

100

I

LOAD

= 1mA

10

ON-RESISTANCE P1 (Ω)

1

02 46810121416

INPUT VOLTAGE VP (V)

FIGURE 1. ON-RESISTANCE SWITCH P1 AS A FUNCTION OF

INPUT VOLTAGE V

P

10

ON-RESISTANCE P2 (Ω)

1

0246810

INPUT VOLTAGE V

S

FIGURE 2. ON-RESISTANCE SWIT CH P2 AS A FUNCTION OF

INPUT VOLTAGE V

S

3-83