Datasheet

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FN3072.7

ICL7660, ICL7660A

CMOS Voltage Converters

The Intersil ICL7660 and ICL7660A are monolithic CMOS

power supply circuits which offer unique performance

advantages over previously available devices. The ICL7660

performs supply voltage conversions from positive to

negative for an input range of +1.5V to +10.0V resulting in

complementary output voltages of -1.5V to -10.0V and the

ICL7660A does the same conversions with an input range of

+1.5V to +12.0V resulting in complementary output voltages

of -1.5V to -12.0V. Only 2 noncritical external capacitors are

needed for the charge pump and charge reservoir functions.

The ICL7660 and ICL7660A can also be connected to

function as voltage doublers and will generate output

voltages up to +18.6V with a +10V input.

Contained on the chip are a series DC supply regulator, RC

oscillator, voltage level translator, and four output power

MOS switches. A unique logic element senses the most

negative voltage in the device and ensures that the output

N-Channel switch source-substrate junctions are not forward

biased. This assures latchup free operation.

The oscillator, when unloaded, oscillates at a nominal

frequency of 10kHz for an input supply voltage of 5.0V. This

frequency can be lowered by the addition of an external

capacitor to the “OSC” terminal, or the oscillator may be

overdriven by an external clock.

The “LV” terminal may be tied to GROUND to bypass the

internal series regulator and improve low voltage (LV)

operation. At medium to high voltages (+3.5V to +10.0V for

the ICL7660 and +3.5V to +12.0V for the ICL7660A), the LV

pin is left floating to prevent device latchup.

Pinouts

ICL7660, ICL7660A

(8 LD PDIP, SOIC)

TOP VIEW

Features

• Simple Conversion of +5V Logic Supply to ±5V Supplies

• Simple Voltage Multiplication (V

OUT

= (-) nV

)

• Typical Open Circuit Voltage Conversion Efficiency 99.9%

• Typical Power Efficiency 98%

• Wide Operating Voltage Range

- ICL7660 . . . . . . . . . . . . . . . . . . . . . . . . . . 1.5V to 10.0V

- ICL7660A . . . . . . . . . . . . . . . . . . . . . . . . . 1.5V to 12.0V

• ICL7660A 100% Tested at 3V

• Easy to Use - Requires Only 2 External Non-Critical

Passive Components

• No External Diode Over Full Temp. and Voltage Range

• Pb-Free Plus Anneal Available (RoHS Compliant)

Applications

• On Board Negative Supply for Dynamic RAMs

• Localized µProcessor (8080 Type) Negative Supplies

• Inexpensive Negative Supplies

• Data Acquisition Systems

CAP+

GND

CAP-

V+

OSC

OUT

Data Sheet October 10, 2005

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

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

All other trademarks mentioned are the property of their respective owners.

Summary of content (11 pages)

PAGE 1
ICL7660, ICL7660A ® Data Sheet October 10, 2005 FN3072.7 CMOS Voltage Converters Features The Intersil ICL7660 and ICL7660A are monolithic CMOS power supply circuits which offer unique performance advantages over previously available devices. The ICL7660 performs supply voltage conversions from positive to negative for an input range of +1.5V to +10.0V resulting in complementary output voltages of -1.5V to -10.0V and the ICL7660A does the same conversions with an input range of +1.5V to +12.
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ICL7660, ICL7660A Ordering Information PART NUMBER TEMP. RANGE (°C) PACKAGE PKG. DWG. # ICL7660CBA* 7660CBA 0 to 70 8 Ld SOIC (N) M8.15 ICL7660CBAZ* (See Note) 7660CBAZ 0 to 70 8 Ld SOIC (N) (Pb-free) M8.15 ICL7660CBAZA* (See Note) 7660CBAZ 0 to 70 8 Ld SOIC (N) (Pb-free) M8.15 ICL7660CPA 7660CPA 0 to 70 8 Ld PDIP E8.3 ICL7660CPAZ ( See Note) 7660CPAZ 0 to 70 8 Ld PDIP** (Pb-free) E8.3 ICL7660ACBA* 7660ACBA 0 to 70 8 Ld SOIC (N) M8.
PAGE 3
ICL7660, ICL7660A C Absolute Maximum Ratings Thermal Information Supply Voltage ICL7660 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +10.5V ICL7660A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +13.0V LV and OSC Input Voltage . . . . . . -0.3V to (V+ +0.3V) for V+ < 5.5V (Note 2) . . . . . . . . . . . . . . (V+ -5.5V) to (V+ +0.3V) for V+ > 5.5V Current into LV (Note 2) . . . . . . . . . . . . . . . . . . . 20µA for V+ > 3.
PAGE 4
ICL7660, ICL7660A Electrical Specifications ICL7660 and ICL7660A, V+ = 5V, TA = 25°C, COSC = 0, Test Circuit Figure 11 Unless Otherwise Specified (Continued) ICL7660 PARAMETER SYMBOL TEST CONDITIONS VOUTEFF V+ = 3V, RL = ∞ Voltage Conversion Efficiency Power Efficiency PEFF ICL7660A MIN TYP MAX MIN TYP MAX UNITS - - - 99 - - % TMIN < TA < TMAX - - - 99 - - % V+ = 3V, RL = 5kΩ - - - 96 - - % TMIN < TA < TMAX - - - 95 - - % NOTES: 2.
PAGE 5
ICL7660, ICL7660A Typical Performance Curves (Test Circuit of Figure 11) (Continued) POWER CONVERSION EFFICIENCY (%) IOUT = 1mA 300 250 200 V+ = +2V 150 100 50 V+ = 5V 0 -55 -25 0 25 50 75 100 125 100 TA = 25°C 98 IOUT = 1mA 96 94 92 IOUT = 15mA 90 88 86 84 82 V+ = +5V 80 100 TEMPERATURE (°C) FIGURE 3. OUTPUT SOURCE RESISTANCE AS A FUNCTION OF TEMPERATURE OSCILLATOR FREQUENCY fOSC (kHz) OSCILLATOR FREQUENCY fOSC (Hz) 20 1K 100 V+ = 5V TA = 25°C 10 1.
PAGE 6
ICL7660, ICL7660A Typical Performance Curves 100 POWER CONVERSION EFFICIENCY (%) TA = 25°C V+ = 2V OUTPUT VOLTAGE +1 0 -1 SLOPE 150Ω -2 0 1 2 3 4 5 LOAD CURRENT IL (mA) 6 7 20.0 90 18.0 I+ 80 16.0 PEFF 70 14.0 60 12.0 50 10.0 40 8.0 30 6.0 20 10 0 8 4.0 TA = 25°C 2.0 V+ = 2V 0 1.5 3.0 4.5 6.0 7.5 9.0 SUPPLY CURRENT (mA) (NOTE 6) +2 (Test Circuit of Figure 11) (Continued) 0 LOAD CURRENT IL (mA) FIGURE 9. OUTPUT VOLTAGE AS A FUNCTION OF OUTPUT CURRENT FIGURE 10.
PAGE 7
ICL7660, ICL7660A The voltage regulator portion of the ICL7660 and ICL7660A is an integral part of the anti-latchup circuitry, however its inherent voltage drop can degrade operation at low voltages. Therefore, to improve low voltage operation the “LV” pin should be connected to GROUND, disabling the regulator. For supply voltages greater than 3.5V the LV terminal must be left open to insure latchup proof operation, and prevent device damage.
PAGE 8
ICL7660, ICL7660A t1 t2 B 0 V A -(V+) FIGURE 14. OUTPUT RIPPLE V+ 1 2 C1 3 8 ICL7660 ICL7660A “1” 4 7 1 6 2 5 C1 3 8 RL 7 ICL7660 ICL7660A “n” 6 4 5 C2 + FIGURE 15. PARALLELING DEVICES V+ 1 2 10µF + 3 - 8 ICL7660 ICL7660A “1” 4 7 1 6 5 2 10µF + - 3 8 ICL7660 ICL7660A “n” 7 6 4 10µF VOUT = - nV+ 5 10µF + + FIGURE 16.
PAGE 9
ICL7660, ICL7660A every cycle. In a typical application where fOSC = 10kHz and C = C1 = C2 = 10µF: 1 RO ≅ 2 (23) + (5 • 103) (10-5) + 4 (ESRC1) + ESRC2 RO ≅ 46 + 20 + 5 (ESRC) Since the ESRs of the capacitors are reflected in the output impedance multiplied by a factor of 5, a high value could potentially swamp out a low 1/(fPUMP • C1) term, rendering an increase in switching frequency or filter capacitance ineffective. Typical electrolytic capacitors may have ESRs as high as 10Ω.
PAGE 10
ICL7660, ICL7660A V+ + C1 - 1 8 2 7 3 ICL7660 ICL7660A 4 1 COSC 2 + 6 5 + VOUT C1 - 3 8 ICL7660 ICL7660A 4 C2 The ICL7660 and ICL7660A may be employed to achieve positive voltage doubling using the circuit shown in Figure 19. In this application, the pump inverter switches of the ICL7660 and ICL7660A are used to charge C1 to a voltage level of V+ -VF (where V+ is the supply voltage and VF is the forward voltage drop of diode D1).
PAGE 11
ICL7660, ICL7660A Other Applications 50K +8V Further information on the operation and use of the ICL7660 and ICL7660A may be found in AN051 “Principals and Applications of the ICL7660 and ICL7660A CMOS Voltage Converter”. 56K +8V - 100Ω 50K 10µF + 100K ICL7611 + 1 2 ICL8069 + 100µF - 3 8 ICL7660 ICL7660A 4 800K 7 6 5 250K VOLTAGE ADJUST VOUT 100µF + FIGURE 22.