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FEATURES APPLICATIONS

D,DGK,ORP PACKAGE

(TOP VIEW)

CAP+

GND

CAP−

OSC

OUT

NC − Nointernalconnection

DESCRIPTION/ORDERING INFORMATION

TL7660

CMOS VOLTAGE CONVERTER

SCAS794 – JUNE 2006

• On-Board Negative Supplies

• Simple Voltage Conversion, Including

• Data-Acquisition Systems

– Negative Converter

• Portable Electronics

– Voltage Doubler

• Wide Operating Range … 1.5 V to 10 V

• Requires Only Two External (Noncritical)

Capacitors

• No External Diode Over Full Temperature and

Voltage Range

• Typical Open-Circuit Voltage Conversion

Efficiency … 99.9%

• Typical Power Efficiency … 98%

• Full Testing at 3 V

The TL7660 is a CMOS switched-capacitor voltage converter that perform supply-voltage conversions from

positive to negative. With only two noncritical external capacitors needed for the charge pump and charge

reservoir functions, an input voltage within the range from 1.5 V to 10 V is converted to a complementary

negative output voltage of –1.5 V to –10 V. The device can also be connected as a voltage doubler to generate

output voltages up to 18.6 V with a 10-V input.

The basic building blocks of the IC include a linear regulator, an RC oscillator, a voltage-level translator, and four

power MOS switches. To ensure latch-up-free operation, the circuitry automatically senses the most negative

voltage in the device and ensures that the N-channel switch source-substrate junctions are not forward biased.

The oscillator frequency runs at a nominal 10 kHz (for V

= 5 V), but that frequency can be decreased by

adding an external capacitor to the oscillator (OSC) terminal or increased by overdriving OSC with an external

clock.

For low-voltage operation (V

< 3.5 V), LV should be tied to GND to bypass the internal series regulator. Above

3.5 V, LV should be left floating to prevent device latchup.

The TL7660C is characterized for operation over a free-air temperature range of –40 ° C to 85 ° C. The TL7660I is

characterized for operation over a free-air temperature range of –40 ° C to 125 ° C.

ORDERING INFORMATION

PACKAGE

(1)

ORDERABLE PART NUMBER TOP-SIDE MARKING

(2)

Reel of 250 TL7660CDGKT

MSOP/VSSOP – DGK TM_

Reel of 2500 TL7660CDGKR

–40 ° C to 85 ° C PDIP – P Tube of 50 TL7660CP TL7660CP

Tube of 75 TL7660CD

SOIC – D 7660C

Reel of 2500 TL7660CDR

Reel of 250 TL7660IDGKT

MSOP/VSSOP – DGK TN_

Reel of 2500 TL7660IDGKR

–40 ° C to 125 ° C PDIP – P Tube of 50 TL7660IP TL7660IP

Tube of 75 TL7660ID

SOIC – D 7660I

Reel of 2500 TL7660IDR

(1) Package drawings, standard packing quantities, thermal data, symbolization, and PCB design guidelines are available at

www.ti.com/sc/package.

(2) DGK: The actual top-side marking has one additional character that indicates the assembly/test site.

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas

Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

PRODUCTION DATA information is current as of publication date.

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.

Summary of content (23 pages)

PAGE 1
TL7660 CMOS VOLTAGE CONVERTER www.ti.com SCAS794 – JUNE 2006 FEATURES APPLICATIONS • • • • • • • • • • Simple Voltage Conversion, Including – Negative Converter – Voltage Doubler Wide Operating Range…1.5 V to 10 V Requires Only Two External (Noncritical) Capacitors No External Diode Over Full Temperature and Voltage Range Typical Open-Circuit Voltage Conversion Efficiency…99.
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TL7660 CMOS VOLTAGE CONVERTER www.ti.com SCAS794 – JUNE 2006 FUNCTIONAL BLOCK DIAGRAM VCC CAP+ RC Oscillator OSC Voltage-Level Translator ¸2 CAP− LV VOUT Voltage Regulator Logic Network Absolute Maximum Ratings (1) over operating free-air temperature range (unless otherwise noted) MIN VCC Supply voltage TL7660 VI OSC and LV input voltage range (2) ILV Current into LV (2) VCC > 3.5 V tOS Output short-circuit duration VSUPPLY ± 5.
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TL7660 CMOS VOLTAGE CONVERTER www.ti.com SCAS794 – JUNE 2006 Electrical Characteristics VCC = 5 V, COSC = 0, LV = Open, TA = 25°C (unless otherwise noted) (see Figure 1) PARAMETER TEST CONDITIONS TA (1) MIN 25°C TYP MAX 45 110 UNIT ICC Supply current RL = ∞ VCC,LOW Supply voltage range (low) RL = 10 kΩ, LV = GND Full range 1.5 3.
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TL7660 CMOS VOLTAGE CONVERTER www.ti.
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TL7660 CMOS VOLTAGE CONVERTER www.ti.
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TL7660 CMOS VOLTAGE CONVERTER www.ti.
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TL7660 CMOS VOLTAGE CONVERTER www.ti.com SCAS794 – JUNE 2006 APPLICATION INFORMATION IS 8 1 7 2 TL7660 C1 + 10 µF - 3 6 4 5 V+ (5 V) IL RL COSC (see Note A) –VOUT C2 10 µF + A. In the circuit, there is no external capacitor applied to terminal 7. However when device is plugged into a test socket,there is usually a very small but finite stray capacitance present on the order of 10 pF. Figure 1.
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TL7660 CMOS VOLTAGE CONVERTER www.ti.com SCAS794 – JUNE 2006 APPLICATION INFORMATION (continued) Theoretical Power Efficiency Considerations In • • • theory, a voltage converter can approach 100% efficiency if certain conditions are met. The driver circuitry consumes minimal power. The output switches have extremely low ON resistance and virtually no offset. The impedances of the pump and reservoir capacitors are negligible at the pump frequency.
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TL7660 CMOS VOLTAGE CONVERTER www.ti.com SCAS794 – JUNE 2006 APPLICATION INFORMATION (continued) Typical Applications Simple Negative Voltage Converter The majority of applications will undoubtedly utilize the TL7660 for generation of negative supply voltages. Figure 3 shows typical connections to provide a negative supply negative (GND) for supply voltages below 3.5 V. V+ 8 1 7 2 10 µF + - 3 TL7660 4 6 5 VOUT = –V+ 10 µF + Figure 3.
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TL7660 CMOS VOLTAGE CONVERTER www.ti.com SCAS794 – JUNE 2006 APPLICATION INFORMATION (continued) Output Ripple ESR also affects the ripple voltage seen at the output. The total ripple is determined by two voltages, A and B, as shown in Figure 4. Segment A is the voltage drop across the ESR of C2 at the instant it goes from being charged by C1 (current flow into C2) to being discharged through the load (current flowing out of C2).
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TL7660 CMOS VOLTAGE CONVERTER www.ti.com SCAS794 – JUNE 2006 APPLICATION INFORMATION (continued) Cascading Devices The TL7660 may be cascaded as shown to produced larger negative multiplication of the initial supply voltage (see Figure 6). However, due to the finite efficiency of each device, the practical limit is 10 devices for light loads. The output voltage is defined by: VOUT = –n (VIN) Where n is an integer representing the number of devices cascaded.
PAGE 12
TL7660 CMOS VOLTAGE CONVERTER www.ti.com SCAS794 – JUNE 2006 APPLICATION INFORMATION (continued) It is also possible to increase the conversion efficiency of the TL7660 at low load levels by lowering the oscillator frequency (see Figure 8). This reduces the switching losses.
PAGE 13
TL7660 CMOS VOLTAGE CONVERTER www.ti.com SCAS794 – JUNE 2006 APPLICATION INFORMATION (continued) Combined Negative Voltage Conversion and Positive Supply Doubling Figure 10 combines the functions shown in Figure 3 and Figure 9 to provide negative voltage conversion and positive voltage doubling simultaneously. This approach would be, for example, suitable for generating +9 V and –5 V from an existing 5-V supply.
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PACKAGE OPTION ADDENDUM www.ti.
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PACKAGE OPTION ADDENDUM www.ti.
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PACKAGE MATERIALS INFORMATION www.ti.com 16-Aug-2012 TAPE AND REEL INFORMATION *All dimensions are nominal Device Package Package Pins Type Drawing TL7660CDGKR VSSOP DGK 8 TL7660CDGKT VSSOP DGK TL7660CDR SOIC D TL7660IDGKR VSSOP TL7660IDGKT TL7660IDR SPQ Reel Reel A0 Diameter Width (mm) (mm) W1 (mm) B0 (mm) K0 (mm) P1 (mm) W Pin1 (mm) Quadrant 2500 330.0 12.4 5.3 3.3 1.3 8.0 12.0 Q1 8 250 180.0 12.4 5.3 3.3 1.3 8.0 12.0 Q1 8 2500 330.0 12.4 6.4 5.2 2.1 8.
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PACKAGE MATERIALS INFORMATION www.ti.com 16-Aug-2012 *All dimensions are nominal Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm) TL7660CDGKR VSSOP DGK 8 2500 370.0 355.0 55.0 TL7660CDGKT VSSOP DGK 8 250 220.0 205.0 50.0 TL7660CDR SOIC D 8 2500 340.5 338.1 20.6 TL7660IDGKR VSSOP DGK 8 2500 370.0 355.0 55.0 TL7660IDGKT VSSOP DGK 8 250 220.0 205.0 50.0 TL7660IDR SOIC D 8 2500 340.5 338.1 20.
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IMPORTANT NOTICE Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, enhancements, improvements and other changes to its semiconductor products and services per JESD46, latest issue, and to discontinue any product or service per JESD48, latest issue. Buyers should obtain the latest relevant information before placing orders and should verify that such information is current and complete.