ICL7663SCPA - Harris Semiconductor

CAUTION: These devices are sensitive to electrostatic discharge. Users should follow proper I.C. Handling Procedures.

SEMICONDUCTOR

ICL7663S

CMOS Programmable Micropower

Positive Voltage Regulator

Description

The ICL7663S Super Programmable Micropower Voltage

Regulator is a low power, high efﬁciency positive voltage

regulator which accepts 1.6V to 16V inputs and provides

adjustable outputs from 1.3V to 16V at currents up to 40mA.

It is a direct replacement for the industry standard ICL7663B

offering

wider

operating voltage and temperature ranges,

improved

output accuracy (ICL7663SA), better temperature

coefﬁcient,

guaranteed

maximum supply current, and

guaranteed line and load regulation. All improvements are

highlighted in the electrical characteristics section.

Critical

parameters are guaranteed over the entire commercial

and industrial temperature ranges.

The ICL7663S/SA

programmable output voltage is set by two external

resistors. The 1% reference accuracy of the ICL7663SA

eliminates the need for trimming the output voltage in most

applications.

The ICL7663S is well suited for battery powered supplies,

featuring 4µA quiescent current, low VIN to VOUT differential,

output current sensing and logic input level shutdown

control. In addition, the ICL7663S has a negative

temperature coefﬁcient output suitable for generating a

temperature compensated display drive voltage for LCD

displays.

The ICL7663S is available in either an 8 lead Plastic DIP,

Ceramic DIP, or SOIC package.

Features

•

Guaranteed

10µA Maximum Quiescent Current Over

All

Temperature Ranges

•

Wider

Operating Voltage Range - 1.6V to 16V

•

Guaranteed

Line and Load Regulation Over

Entire

Operating Temperature Range

Optional

• 1% Output Voltage Accuracy (ICL7663SA)

• Output Voltage Programmable from 1.3V to 16V

•

Improved

Temperature Coefﬁcient of Output Voltage

• 40mA Minimum Output Current with Current Limiting

• Output Voltages with Programmable Negative Temper-

ature Coefﬁcients

• Output Shutdown via Current-Limit Sensing or Exter-

nal Logic Level

• Low Input-to-Output Voltage Differential

• Improved Direct Replacement for Industry Standard

ICL7663B and Other Second-Source Products

Applications

• Low-Power Portable Instrumentation

• Pagers

• Handheld Instruments

• LCD Display Modules

• Remote Data Loggers

• Battery-Powered Systems

File Number 3180.2

April 1994

Pinout

ICL7663S (PDIP, CERDIP, SOIC)

TOP VIEW

SENSE

VOUT2

VOUT1

GND

VIN+

VTC

VSET

SHDN

Ordering Information

PART NUMBER TEMPERATURE

RANGE PACKAGE

ICL7663SCBA 0oC to +70oC 8 Lead SOIC (N)

ICL7663SCPA 8 Lead Plastic DIP

ICL7663SCJA 8 Lead CerDIP

ICL7663SACBA 8 Lead SOIC (N)

ICL7663SACPA 8 Lead Plastic DIP

ICL7663SACJA 8 Lead CerDIP

ICL7663SIBA -25oC to +85oC 8 Lead SOIC (N)

ICL7663SIPA 8 Lead Plastic DIP

ICL7663SIJA 8 Lead CerDIP

ICL7663SAIBA 8 Lead SOIC (N)

ICL7663SAIPA 8 Lead Plastic DIP

ICL7663SAIJA 8 Lead CerDIP

7-139

Speciﬁcations ICL7663S

Absolute Maximum Ratings Thermal Information

Input Supply Voltage. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +18V

Any Input or Output Voltage (Note 1)

Terminals 1, 2, 3, 5, 6, 7 . . . . . . . . . . . . . . VIN+0.3V to GND-0.3V

Output Source Current

Terminal 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .50mA

Terminal 3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .25mA

Output Sinking Current

Terminal 7 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -10mA

Thermal Resistance θJA θJC

Ceramic DIP Package. . . . . . . . . . . . . . . 115oC/W 30oC/W

Plastic DIP Package . . . . . . . . . . . . . . . . 150oC/W -

Plastic SOIC Package. . . . . . . . . . . . . . . 180oC/W -

Maximum Junction Temperature

Plastic DIP Package . . . . . . . . . . . . . . . . . . . . . . . . . . . . +150oC

CerDIP Package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +175oC

Storage Temperature Range. . . . . . . . . . . . . . . . . .-65oC to +150oC

Lead Temperature (Soldering 10s) . . . . . . . . . . . . . . . . . . . . +300oC

(SOIC - Lead Tips Only)

CAUTION: Stresses above those listed in “Absolute Maximum Ratings” may cause permanent damage to the device. This is a stress only 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.

Operating Conditions

Operating Temperature Range

ICL7663SC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .0oC to +70oC

ICL7663SI. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -25oC to +85oC

Electrical Speciﬁcations Speciﬁcations Below Applicable to Both ICL7663S and ICL7663SA, Unless Otherwise Speciﬁed.

V+IN = 9V, VOUT = 5V, TA = +25oC, Unless Otherwise Speciﬁed. Notes 4, 5. See Test Circuit, Figure 7

PARAMETERS SYMBOL TEST CONDITIONS MIN TYP MAX UNITS

Input Voltage V+IN ICL7663S TA = +25oC 1.5 - 16 V

0oC < TA < +70oC 1.6 - 16 V

-25oC < TA < +85oC 1.6 - 16 V

ICL7663SA 0oC < TA < +70oC 1.6 - 16 V

-25oC < TA < +85oC 1.6 - 16 V

Quiescent Current IQ1.4V ≤ VOUT ≤ 8.5V, No Load

V+IN = 9V 0oC < TA < +70oC--10 µA

-25oC < TA < +85oC- - 10 µA

V+IN = 16V 0oC < TA < +70oC--12 µA

-25oC < TA < +85oC- - 12 µA

Reference Voltage VSET IOUT1 = 100µA, VOUT = VSET

ICL7663S TA = +25oC 1.2 1.3 1.4 V

ICL7663SA TA = +25oC 1.275 1.29 1.305 V

Temperature

Coefficient ∆VSET

∆T

0oC < TA < +70oC-100 - ppm

-25oC < TA < +85oC-100 - ppm

Line Regulation ∆VSET

VSET’ ∆VIN

2V < VIN < 15V 0oC < TA < +70oC - 0.03 - %/V

-25oC < TA < +85oC - 0.03 0.3 %/V

VSET Input Current ISET 0oC < TA < +70oC - 0.01 10 nA

-25oC < TA < +85oC - 0.01 10 nA

Shutdown Input Current ISHDN -±0.01 10 nA

Shutdown Input Voltage VSHDN VSHDN HI: Both VOUT Disabled 1.4 - - V

VSHDN LO: Both VOUT Enable - - 0.3 V

Sense Pin Input Current ISENSE - 0.01 10 nA

Sense Pin Input Thresh-

old VCL - 0.5 - V

Input-Output Saturation

Resistance (Note 2) RSAT V+IN = 2V, IOUT1 = 1mA - 170 350 Ω

V+IN = 9V, IOUT1 = 2mA - 50 100 Ω

V+IN = 15V, IOUT1 = 5mA - 35 70 Ω

Load Regulation ∆VOUT

∆IOUT

1mA < IOUT2 < 20mA - 1 3 Ω

50µA < IOUT1 < 5mA - 2 10 Ω

7-140

Speciﬁcations ICL7663S

Functional Diagram

Available Output Current

(VOUT2)IOUT2 3V ≤ VIN ≤ 16V, VIN - VOUT2 = 1.5V 40 - - mA

Negative Tempco Output

(Note 3) VTC Open Circuit Voltage - 0.9 - V

ITC Maximum Sink Current 0 8 2.0 mA

Temperature Coefficient ∆VTC

∆T

Open Circuit - +2.5 - mV/oC

Minimum Load Current IL(MIN) Includes VSET Divider TA = +25oC--1.0 µA

0oC < TA < +70oC - 0.2 5.0 µA

-25oC < TA < +85oC - 0.2 5.0 µA

NOTES:

1. Connecting any terminal to voltages greater than (V+IN + 0.3V) or less than (GND - 0.3V) may cause destructive device latch-up. It is

recommended that no inputs from sources operating on external power supplies be applied prior to ICL7663S power-up.

2. This parameter refers to the saturation resistance of the MOS pass transistor. The minimum input-output voltage differential at low current

(under 5mA), can be determined by multiplying the load current (including set resistor current, but not quiescent current) by this

resistance.

3. This output has a positive temperature coefficient. Using it in combination with the inverting input of the regulator at VSET, a negative

coefficient results in the output voltage. See Figure 9 for details. Pin will not source current.

4. All pins are designed to withstand electrostatic discharge (ESD) levels in excess of 2000V.

5. All significant improvements over the industry standard ICL7663 are highlighted.

Electrical Speciﬁcations Speciﬁcations Below Applicable to Both ICL7663S and ICL7663SA, Unless Otherwise Speciﬁed.

V+IN = 9V, VOUT = 5V, TA = +25oC, Unless Otherwise Speciﬁed. Notes 4, 5. See Test Circuit, Figure 7

(Continued)

PARAMETERS SYMBOL TEST CONDITIONS MIN TYP MAX UNITS

REF B

VOUT1

VOUT2

SENSE

VSET

VTC

SHUTDOWN

GND

V+IN 8

GND

7-141

ICL7663S

Typical Performance Curves

FIGURE 1. VOUT2 OUTPUT VOLTAGE AS A FUNCTION OF

OUTPUT CURRENT FIGURE 2. VOUT1 INPUT-OUTPUT DIFFERENTIAL vs OUTPUT

CURRENT

FIGURE 3. VOUT2 INPUT-OUTPUT DIFFERENTIAL vs OUTPUT

CURRENT FIGURE 4. INPUT POWER SUPPLY REJECTION RATIO

FIGURE 5. QUIESCENT CURRENT AS A FUNCTION OF INPUT

VOLTAGE FIGURE 6. QUIESCENT CURRENT AS A FUNCTION OF TEM-

PERATURE

5.000

4.995

4.990

4.985

4.980

4.975

4.970

4.965

4.960

4.955

4.950

VOUT (V)

10-2 10-1 100101102

10-3

IOUT (mA)

TA = +25oC

V+ = 9.0V

2.0

1.8

1.6

1.4

1.2

1.0

0.8

0.6

0.4

0.2

00 2 4 6 8 101214161820

= +25oC

V+IN = 15V

V+IN - VOUT1 (V)

IOUT1 (mA)

V+IN = 9V

V+IN = 2V

IOUT2 (mA)

V+IN - VOUT1 (V)

2.0

1.8

1.6

1.4

1.2

1.0

0.8

0.6

0.4

0.2

00 5 10 15 20 25 30 35 40 45 50

V+IN = 9V

TA = +25oC

V+IN = 2V

V+IN = 15V

10-2 10-1 1001011021k

100

PSRR (dB)

FREQUENCY (Hz)

VIN = +9.0V

∆VIN = 2V

TA = -20oC

5.0

4.5

4.0

3.5

3.0

2.5

2.0

1.5

1.0

0.5

00246810121416

V+IN (V)

IO (µA)

TA = -25oC

TA = -70oC

5.00

4.75

4.50

4.25

4.00

3.75

3.50

3.25

3.00

2.75

2.50

IO (µA)

V+ = +15V

V+ = +9V

V+ = +2V

-20 0 20 40 60 80

TEMPERATURE (oC)

7-142

ICL7663S

Detailed Description

The ICL7663S is a CMOS integrated circuit incorporating all

the functions of a voltage regulator plus protection circuitry

on a single monolithic chip. Referring to the Functional Dia-

gram, the main blocks are a bandgap-type voltage reference,

an error ampliﬁer, and an output driver with both PMOS and

NPN pass transistors.

The bandgap output voltage, trimmed to 1.29V ± 15mV for

the ICL7663SA, and the input voltage at the VSET terminal

are compared in ampliﬁer A. Error ampliﬁer A drives a

P-channel pass transistor which is sufﬁcient for low (under

about 5mA) currents. The high current output is passed by

an NPN bipolar transistor connected as a follower. This

conﬁguration gives more gain and lower output impedance.

Logic-controlled shutdown is implemented via a N-channel

MOS transistor. Current-sensing is achieved with

comparator C, which functions with the VOUT2 terminal. The

ICL7663S has an output (VTC) from a buffer ampliﬁer (B),

which can be used in combination with ampliﬁer A to

generate programmable-temperature-coefﬁcient output

voltages.

The ampliﬁer, reference and comparator circuitry all operate

at bias levels well below 1µA to achieve extremely low

quiescent current. This does limit the dynamic response of

the circuits, however, and transients are best dealt with

outside the regulator loop.

Basic Operation

The ICL7663S is designed to regulate battery voltages in the

5V to 15V region at maximum load currents of about 5mA to

30mA. Although intended as low power devices, power dissi-

pation limits must be observed. For example, the power dis-

sipation in the case of a 10V supply regulated down to 2V

with a load current of 30mA clearly exceeds the power dissi-

pation rating of the Mini-DIP:

(10 - 2) (30) (10-3) = 240mW

The circuit of Figure 8 illustrates proper use of the device.

CMOS devices generally require two precautions: every

input pin must go somewhere, and maximum values of

applied voltages and current limits must be rigorously

observed. Neglecting these precautions may lead to, at the

least, incorrect or nonoperation, and at worst, destructive

device failure. To avoid the problem of latchup, do not apply

inputs to any pins before supply voltage is applied.

Input Voltages - The ICL7663S accepts working inputs of

1.5V to 16V. When power is applied, the rate-of-rise of the

input may be hundreds of volts per microsecond. This is

potentially harmful to the regulators, where internal operat-

ing currents are in the nanoampere range. The 0.047µF

capacitor on the device side of the switch will limit inputs to a

safe level around 2V/µs. Use of this capacitor is suggested in

all applications. In severe rate-of-rise cases, it may be advis-

able to use an RC network on the SHutDowN pin to delay

output turn-on. Battery charging surges, transients, and

assorted noise signals should be kept from the regulators by

RC ﬁltering, zener protection, or even fusing.

NOTES:

FIGURE 7. ICL7663S TEST CIRCUIT

Output Voltages - The resistor divider R2/R1 is used to

scale the reference voltage, VSET, to the desired output using

the formula VOUT = (1 + R2/R1) VSET. Suitable arrangements

of these resistors, using a potentiometer, enables exact

values for VOUT to be obtained. In most applications the

potentiometer may be eliminated by using the ICL7663SA.

The ICL7663SA has VSET voltage guaranteed to be 1.29V

±15mV and when used with ±1% tolerance resistors for R1

and R2 the initial output voltage will be within ±2.7% of ideal.

The low leakage current of the VSET terminal allows R1 and

R2 to be tens of megohms for minimum additional quiescent

drain current. However, some load current is required for

proper operation, so for extremely low-drain applications it is

necessary to draw at least 1µA. This can include the current

for R2 and R1.

Output voltages up to nearly the VIN supply may be obtained

at low load currents, while the low limit is the reference

voltage. The minimum input-output differential in each

regulator is obtained using the VOUT1, terminal. The input-

output differential increases to 1.5V when using VOUT2.

Output Currents - Low output currents of less than 5mA are

obtained with the least input-output differential from the

VOUT1 terminal (connect VOUT2 to VOUT1). Where higher cur-

rents are needed, use VOUT2 (VOUT1, should be left open in

this case).

High output currents can be obtained only as far as package

dissipation allows. It is strongly recommended that output

current-limit sensing be used in such cases.

Current-Limit Sensing - The on-chip comparator (C in the

Functional Diagram) permits shutdown of the regulator

1. S1 when closed disables output current limiting.

2. Close S2 for VOUT1, open S2 for VOUT2.

3. VOUT = R2 + R1

R1VSET.

4. IQ quiescent currents measured at GND pin by meter M.

5. S3 when ON, permits normal operation, when OFF, shuts

down both VOUT1 and VOUT2.

SHDN

VOUT2

VOUT1

VTC

VSET

SENSE

GND

1µA MIN

S2S1

RCL

RLCL

(7663 ONLY)

VOUT

OFF

1MΩ1.4V < VSHDN < V+IN

0.047µF

-M

7-143

ICL7663S

output in the event of excessive current drain. As Figure 8

shows, a current-limiting resistor, RCL, is placed in series

with VOUT2 and the SENSE terminal is connected to the load

side of RCL. When the current through RCL is high enough to

produce a voltage drop equal to VCL (0.5V) the voltage

feedback is by-passed and the regulator output will be

limited to this current. Therefore, when the maximum load

current (ILOAD) is determined, simply divide VCL by ILOAD to

obtain the value for RCL.

FIGURE 8. POSITIVE REGULATOR WITH CURRENT LIMIT

Logic-Controllable Shutdown - When equipment is not

needed continuously (e.g., in remote data-acquisition

systems), it is desirable to eliminate its drain on the system

until it is required. This usually means switches, with their

unreliable contacts. Instead, the ICL7663S can be shut

down by a logic signal, leaving only IQ (under 4µA) as a

drain on the power source. Since this pin must not be left

open, it should be tied to ground if not needed. A voltage of

less than 0.3V for the ICL7663S will keep the regulator ON,

and a voltage level of more than 1.4V but less than V+IN will

turn the outputs OFF. If there is a possibility that the control

signal could exceed the regulator input (V+IN) the current

from this signal should be limited to 100µA maximum by a

high value (1MΩ) series resistor. This situation may occur

when the logic signal originates from a system powered

separately from that of the regulator.

Additional Circuit Precautions - This regulator has poor

rejection of voltage ﬂuctuations from AC sources above 10Hz

or so. To prevent the output from responding (where this might

be a problem), a reservoir capacitor across the load is advised.

The value of this capacitor is chosen so that the regulated out-

put voltage reaches 90% of its ﬁnal value in 20ms. From:

VOUT

R2 + R1

R1VSET = 5V

ICL = VCL

RCL = 25mA

I = ∆V

C,C

∆t= IOUT (20 x 10-3)

0.9VOUT = 0.022 IOUT

VOUT

SHDN

VOUT2

VOUT1

VTC

VSET

SENSE

GND

VIN 0.047µF

V+IN

604kΩ

RCL

20Ω

210kΩR1

10µFVOUT

+5V

In addition, where such a capacitor is used, a current-limiting

resistor is also suggested (see “Current-Limit Sensing”).

Producing Output Voltages with Negative Temperature

Coefﬁcients - The ICL7663S has an additional output which

is 0.9V relative to GND and has a tempco of +2.5mV/oC. By

applying this voltage to the inverting input of ampliﬁer A (i.e.,

the VSET pin), output voltages having negative TC may be

produced. The TC of the output voltage is controlled by the

R2/R3 ratio (see Figure 9 and its design equations).

Where: VSET = 1.3V

VTC = 0.9V

TCVTC = +2.5mV/oC

FIGURE 9. GENERATING NEGATIVE TEMPERATURE

COEFFICIENTS

Applications

Boosting Output Current with External Transistor

The maximum available output current from the ICL7663S is

40mA. To obtain output currents greater than 40mA, an exter-

nal NPN transistor is used connected as shown in Figure 10.

FIGURE 10. BOOSTING OUTPUT CURRENT WITH EXTERNAL

TRANSISTOR

EQ. 1:VOUT = VSET(R2

1 + R1)R2

+R3(VSET - VTC)

EQ. 2: TC VOUT = R2

-R3(TC VTC) in mV/oC

VREF

VSET

+VTC -

R1R2

VOUT

SHDN

VOUT2

VOUT1

VSET

SENSE

GND

VIN 10µF

V+IN

604kΩ

100Ω

210kΩ

VOUT

+5V

0.47Ω

EXTERNAL PIN

POWER

TRANSISTOR

7-144

ICL7663S

Generating a Temperature Compensated Display Drive

Voltage

Temperature has an important effect in the variation of

threshold voltage in multiplexed LCD displays. As

temperature rises, the threshold voltage goes down. For

applications where the display temperature varies widely, a

temperature compensated display voltage, VDISP, can be

generated using the ICL7663S. This is shown in Figure 11

for the ICM7233 triplexed LCD display driver.

FIGURE 11. GENERATING A MULTIPLEXED LCD DISPLAY DRIVE VOLTAGE

VOUT2

VOUT1

VSET

GND

V+IN

VTC

VDISP

ICM7233

ICL7663S

GND

DATA BUS

V+

+5V

1.8MΩ

300KΩ

2.7MΩ

LOGIC

SYSTEM,

PROCESSOR,

ETC.

GND