Data Sheet

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FN3179 Rev 7.00 Page 1 of 13

January 23, 2013

FN3179

Rev 7.00

January 23, 2013

ICL7660S, ICL7660A

Super Voltage Converters

DATASHEET

The ICL7660S and ICL7660A Super Voltage Converters are

monolithic CMOS voltage conversion ICs that guarantee

significant performance advantages over other similar

devices. They are direct replacements for the industry

standard ICL7660 offering an extended operating supply

voltage range up to 12V, with lower supply current. A

Frequency Boost pin has been incorporated to enable the

user to achieve lower output impedance despite using smaller

capacitors. All improvements are highlighted in the “Electrical

Specifications” section on page 3. Critical parameters are

guaranteed over the entire commercial and industrial

temperature ranges.

The ICL7660S and ICL7660A perform supply voltage

conversions from positive to negative for an input range of

1.5V to 12V, resulting in complementary output voltages of

-1.5V to -12V. Only two non-critical external capacitors are

needed, for the charge pump and charge reservoir functions.

The ICL7660S and ICL7660A can be connected to function

as a voltage doubler and will generate up to 22.8V with a

12V input. They can also be used as a voltage multipliers or

voltage dividers.

Each chip contains a series DC power supply regulator, RC

oscillator, voltage level translator, and four output power

MOS switches. 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 over-driven by an external clock.

The “LV” terminal may be tied to GND to bypass the internal

series regulator and improve low voltage (LV) operation. At

medium to high voltages (3.5V to 12V), the LV pin is left

floating to prevent device latchup.

In some applications, an external Schottky diode from V

OUT

to CAP- is needed to guarantee latchup free operation (see

Do’s and Dont’s section on page 8).

Features

• Guaranteed Lower Max Supply Current for All

Temperature Ranges

• Wide Operating Voltage Range: 1.5V to 12V

• 100% Tested at 3V

• Boost Pin (Pin 1) for Higher Switching Frequency

• Guaranteed Minimum Power Efficiency of 96%

• Improved Minimum Open Circuit Voltage Conversion

Efficiency of 99%

• Improved SCR Latchup Protection

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

• Simple Voltage Multiplication V

OUT

= (-)nV

• Easy to Use; Requires Only Two External Non-Critical

Passive Components

• Improved Direct Replacement for Industry Standard

ICL7660 and Other Second Source Devices

• Pb-Free Available (RoHS Compliant)

Applications

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

• Voltage Multiplication V

OUT

= ±nV

• Negative Supplies for Data Acquisition Systems and

Instrumentation

• RS232 Power Supplies

• Supply Splitter, V

OUT

= ±V

Pin Configurations

ICL7660S

(8 LD PDIP, SOIC)

TOP VIEW

ICL7660A

(8 LD PDIP, SOIC)

TOP VIEW

BOOST

CAP+

GND

CAP-

V+

OSC

OUT

CAP+

GND

CAP-

V+

OSC

OUT

Summary of content (13 pages)

PAGE 1
DATASHEET ICL7660S, ICL7660A FN3179 Rev 7.00 January 23, 2013 Super Voltage Converters The ICL7660S and ICL7660A Super Voltage Converters are monolithic CMOS voltage conversion ICs that guarantee significant performance advantages over other similar devices. They are direct replacements for the industry standard ICL7660 offering an extended operating supply voltage range up to 12V, with lower supply current.
PAGE 2
ICL7660S, ICL7660A Ordering Information PART NUMBER (NOTE 3) PART MARKING TEMP. RANGE (°C) PACKAGE PKG. DWG. # ICL7660SCBA (Note 1) 7660 SCBA 0 to +70 8 Ld SOIC M8.15 ICL7660SCBAZ (Notes 1, 2) 7660 SCBAZ 0 to +70 8 Ld SOIC (Pb-free) M8.15 ICL7660SCPA 7660S CPA 0 to +70 8 Ld PDIP E8.3 ICL7660SCPAZ (Note 2) 7660S CPAZ 0 to +70 8 Ld PDIP (Pb-free; Note 4) E8.3 ICL7660SIBA (Note 1) 7660 SIBA -40 to +85 8 Ld SOIC M8.
PAGE 3
ICL7660S, ICL7660A Absolute Maximum Ratings Thermal Information Supply Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +13.0V LV and OSC Input Voltage (Note 5) V+ < 5.5V . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to V+ + 0.3V V+ > 5.5V . . . . . . . . . . . . . . . . . . . . . . . . . . . V+ -5.5V to V+ +0.3V Current into LV (Note 5) V+ > 3.5V . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
PAGE 4
ICL7660S, ICL7660A Electrical Specifications PARAMETER Oscillator Impedance ICL7660S and ICL7660A, V+ = 5V, TA = +25°C, OSC = Free running (see Figure 12, “ICL7660S Test Circuit” on page 7 and Figure 13 “ICL7660A Test Circuit” on page 7), unless otherwise specified.
PAGE 5
ICL7660S, ICL7660A Functional Block Diagram 8 OSC LV 7 Q1 VOLTAGE LEVEL TRANSLATOR OSCILLATOR AND DIVIDE-BY2 COUNTER V+ 2 Q2 3 CAP+ GND 6 Q4 INTERNAL SUPPLY REGULATOR 4 5 Q3 3 CAPVOUT SUBSTRATE LOGIC NETWORK 3 3 Typical Performance Curves See Figure 12, “ICL7660S Test Circuit” on page 7) and Figure 13 “ICL7660A Test Circuit” on page 7 12 OUTPUT SOURCE RESISTANCE (Ω) 250 SUPPLY VOLTAGE (V) 10 8 SUPPLY VOLTAGE RANGE (NO DIODE REQUIRED) 6 4 2 0 TA = +125°C 200 TA = +25°C 150 TA = -55°
PAGE 6
ICL7660S, ICL7660A Typical Performance Curves See Figure 12, “ICL7660S Test Circuit” on page 7) and Figure 13 “ICL7660A Test Circuit” on page 7 (Continued) 20 V+ = 5V TA = +25°C 9 OSCILLATOR FREQUENCY fOSC (kHz) 8 7 6 5 4 3 2 1 18 16 14 V+ = 10V 12 10 V+ = 5V 8 0 10 COSC (pF) 100 V+ = 5V OUTPUT VOLTAGE (V) 0 25 50 75 100 TA = +25°C -1 -2 -3 -4 100 100 90 90 80 80 70 70 60 60 50 50 40 40 30 30 20 V+ = 5V 20 10 TA = +25°C 10 0 0 -5 0 10 125 FIGURE 6.
PAGE 7
ICL7660S, ICL7660A Typical Performance Curves OUTPUT RESISTANCE (Ω) See Figure 12, “ICL7660S Test Circuit” on page 7) and Figure 13 “ICL7660A Test Circuit” on page 7 (Continued) 400 V+ = 5V TA = +25°C I = 10mA C1 = C2 = 1mF C1 = C2 = 10mF 300 C1 = C2 = 100mF 200 100 0 100 1k 10k 100k OSCILLATOR FREQUENCY (Hz) FIGURE 11. OUTPUT SOURCE RESISTANCE AS A FUNCTION OF OSCILLATOR FREQUENCY NOTE: 14.
PAGE 8
ICL7660S, ICL7660A Detailed Description The ICL7660S and ICL7660A contain all the necessary circuitry to complete a negative voltage converter, with the exception of two external capacitors, which may be inexpensive 10µF polarized electrolytic types. The mode of operation of the device may best be understood by considering Figure 14, which shows an idealized negative voltage converter. Capacitor C1 is charged to a voltage, V+, for the half cycle, when switches S1 and S3 are closed.
PAGE 9
ICL7660S, ICL7660A charge the capacitors every cycle. Equation 4 shows a typical application where fOSC = 10kHz and C = C1 = C2 = 10µF: Typical Applications Simple Negative Voltage Converter The majority of applications will undoubtedly utilize the ICL7660S and ICL7660A for generation of negative supply voltages. Figure 15 shows typical connections to provide a negative supply where a positive supply of +1.5V to +12V is available.
PAGE 10
ICL7660S, ICL7660A This is of major importance for surface mount applications where capacitor size and cost are critical. Smaller capacitors, such as 0.1µF, can be used in conjunction with the Boost Pin to achieve similar output currents compared to the device free running with C1 = C2 = 10µF or 100µF. (see Figure 11). Increasing the oscillator frequency can also be achieved by overdriving the oscillator from an external clock, as shown in Figure 16.
PAGE 11
ICL7660S, ICL7660A V+ 1 2 C1 + - 3 ICL7660S ICL7660A 4 7 RL1 VOUT = -VIN 8 D1 + 6 + VOUT = V+ - V2 C2 2 + 50µF D2 V+ + 1 C3 5 - 50µF - RL2 VOUT = (2V+) (VFD1) - (VFD2) 3 50µF + C - 4 + 8 ICL7660S ICL7660A 4 7 6 5 V- D3 FIGURE 20. SPLITTING A SUPPLY IN HALF FIGURE 19.
PAGE 12
ICL7660S, ICL7660A Dual-In-Line Plastic Packages (PDIP) E8.3 (JEDEC MS-001-BA ISSUE D) N 8 LEAD DUAL-IN-LINE PLASTIC PACKAGE E1 INDEX AREA 1 2 3 INCHES N/2 -B- -AD E BASE PLANE -C- SEATING PLANE A2 A L D1 e B1 D1 A1 eC B 0.010 (0.25) M C A B S MILLIMETERS SYMBOL MIN MAX MIN MAX NOTES A - 0.210 - 5.33 4 A1 0.015 - 0.39 - 4 A2 0.115 0.195 2.93 4.95 - B 0.014 0.022 0.356 0.558 - C L B1 0.045 0.070 1.15 1.77 8, 10 eA C 0.008 0.014 0.204 C D 0.
PAGE 13
ICL7660S, ICL7660A Package Outline Drawing M8.15 8 LEAD NARROW BODY SMALL OUTLINE PLASTIC PACKAGE Rev 4, 1/12 DETAIL "A" 1.27 (0.050) 0.40 (0.016) INDEX 6.20 (0.244) 5.80 (0.228) AREA 0.50 (0.20) x 45° 0.25 (0.01) 4.00 (0.157) 3.80 (0.150) 1 2 8° 0° 3 0.25 (0.010) 0.19 (0.008) SIDE VIEW “B” TOP VIEW 2.20 (0.087) SEATING PLANE 5.00 (0.197) 4.80 (0.189) 1.75 (0.069) 1.35 (0.053) 1 8 2 7 0.60 (0.023) 1.27 (0.050) 3 6 4 5 -C- 1.27 (0.050) 0.51(0.020) 0.33(0.013) SIDE VIEW “A 0.25(0.