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Texas Instruments TL7660CDGKR
- Part No.:
- TL7660CDGKR
- Manufacturer:
- Texas Instruments
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
TL7660CDGKR.pdf
- Description:
- IC REG CHARGE PUMP INV 8VSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,533
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Product details
Overview
TL7660CDGKR from Texas Instruments is a CMOS switched-capacitor voltage converter that generates a regulated negative output voltage (–VCC) from a positive input supply of 1.5 V to 10 V, using only two external noncritical capacitors. It operates as a negative voltage converter or voltage doubler, features 10 kHz nominal oscillator frequency, 98% typical power efficiency, and supports –40°C to 85°C operation in an 8-pin VSSOP package. It is used in portable electronics for dual-rail analog circuitry requiring low-noise, low-quiescent-current bias supplies.
For engineers reviewing the TL7660CDGKR datasheet, TL7660CDGKR pinout, TL7660CDGKR application, or TL7660CDGKR equivalent, key selection criteria include its ±1.5 V to ±10 V conversion range, LV terminal logic for low-voltage bypass, OSC terminal programmability, absence of external diodes across temperature, and compatibility with polarized electrolytic pump/reservoir capacitors.
Technical Context
The TL7660CDGKR integrates four power MOS switches (one p-channel, three n-channel), an RC oscillator, a linear regulator, and a voltage-level translator to implement charge-pump-based voltage inversion. Its internal logic network dynamically biases switch substrates to prevent latch-up during startup and short-circuit conditions.
Oscillator frequency is nominally 10 kHz at VCC = 5 V but is adjustable via external capacitor on OSC (pin 7) or overdrive with external clock. The LV (pin 6) terminal must be tied to GND for VCC < 3.5 V to bypass the internal regulator and ensure stable operation; it must remain floating above 3.5 V to avoid latch-up.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 1.5 V to 10 V - supports single-cell Li-ion, alkaline, and regulated 3.3/5 V rails without external regulation |
| Negative Output Range | –1.5 V to –10 V - complementary inverted output with no polarity reversal required in layout |
| Oscillator Frequency | 10 kHz nominal (VCC = 5 V) - sets charge-pump switching period; adjustable down to ~1 kHz or up via external clock |
| Power Efficiency | 98% typical (RL = 5 kΩ) - minimizes thermal load and extends battery life in portable systems |
| Voltage Conversion Efficiency | 99.9% typical (open-circuit) - preserves input-to-output voltage magnitude with minimal loss under light loads |
| Supply Current | 45 µA typical (VCC = 5 V, no load) - enables micropower operation in always-on sensor or standby circuits |
| Output Source Resistance | 70 Ω typical (VCC = 5 V, IO = 20 mA) - defines small-signal AC impedance and load regulation capability |
Pinout & Package
VSSOP-8 (DGK) package: 3.0 mm × 3.0 mm body, 0.65 mm pitch, exposed pad optional, RoHS-compliant NiPdAu lead finish, MSL Level-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (NC) | No internal connection | Unused pin; must be left unconnected or tied to GND for mechanical stability - no electrical function |
| 2 (CAP+) | Positive pump capacitor terminal | Connects to positive electrode of C1; polarity-sensitive when using electrolytic capacitors |
| 3 (GND) | Ground reference | System ground return for all internal circuitry and external capacitors; critical for latch-up prevention |
| 4 (CAP−) | Negative pump capacitor terminal | Connects to negative electrode of C1; forms charge-transfer path with CAP+ during switching cycles |
| 5 (VOUT) | Negative output voltage node | Delivers inverted output; must not exceed GND potential to avoid destructive latch-up |
| 6 (LV) | Low-voltage mode control | Tie to GND for VCC < 3.5 V to disable internal regulator; leave floating above 3.5 V |
| 7 (OSC) | Oscillator timing node | Accepts external capacitor to reduce frequency or external CMOS clock (with 1-kΩ series resistor) to increase it |
| 8 (VCC) | Positive supply input | Primary power input; absolute max 10.5 V; requires local 0.1 µF decoupling near pin |
Key Features
| Feature | Design Value |
|---|---|
| No external diodes required | Eliminates forward-voltage drop and temperature drift issues of discrete diode-based charge pumps |
| Auto-substrate biasing logic | Prevents N-channel switch source-substrate forward conduction across full temperature and load range |
| LV-controlled regulator bypass | Enables reliable operation down to 1.5 V input by disabling series regulator below 3.5 V |
| Programmable oscillator | Allows trade-off between ripple (lower fOSC) and output impedance (higher fOSC) via external capacitor or clock |
| Two-capacitor topology | Reduces BOM count and board space vs. inductor-based converters; supports low-cost 10 µF electrolytics |
Applications
| Portable Instrumentation | Data Acquisition Systems |
|---|---|
Use Scenario: Handheld multimeter powering dual-rail op-amps from a single 9-V alkaline battery. IC Role / Device Role / Timing Role: Generates –4.5 V rail from +4.5 V mid-point reference to enable true bipolar signal measurement. Use Value: Eliminates need for separate negative battery or inductor-based DC/DC, reducing size and EMI in compact enclosures. | Use Scenario: 16-bit SAR ADC front-end requiring clean ±2.5 V reference and analog supply rails. IC Role / Device Role / Timing Role: Provides low-noise, low-ripple negative supply synchronized to sampling clock via OSC pin control. Use Value: Achieves <1 LSB error contribution from supply noise due to high voltage-conversion efficiency and absence of magnetic components. |
| Industrial Sensor Transmitters | Low-Power Analog Signal Chains |
Use Scenario: 4–20 mA loop-powered pressure transmitter with isolated analog front-end. IC Role / Device Role / Timing Role: Generates isolated negative bias for instrumentation amplifiers using transformer-coupled power and local TL7660CDGKR. Use Value: Enables rail-to-rail input common-mode range without increasing loop current budget beyond 20 mA. | Use Scenario: Battery-operated gas sensor module with electrochemical cell requiring ±1.2 V bias. IC Role / Device Role / Timing Role: Delivers precision negative voltage from 3.3 V LDO output while consuming only 45 µA quiescent current. Use Value: Extends shelf life and operational runtime by minimizing static power draw in always-on sensing mode. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX1044CSA+ | Pin-compatible 8-pin SOIC; fixed 10 kHz oscillator; no LV pin; requires external diodes for full temp range | Less suitable for sub-3.5 V operation; higher quiescent current (120 µA); no regulator-bypass option | Select MAX1044CSA+ only if SOIC footprint is mandatory and input ≥ 4.5 V; verify diode thermal derating. |
| ICL7660SIPAZ | 8-pin PDIP; improved ESD rating; 100 µA max ICC; same functional block diagram but lower efficiency (95% typ) | Better suited for through-hole prototyping or legacy industrial PCBs; higher thermal resistance (θJA = 85°C/W) | Choose ICL7660SIPAZ for manual assembly or high-reliability environments where VSSOP reflow is unavailable. |
Compared with MAX1044CSA+ and ICL7660SIPAZ, the TL7660CDGKR offers superior low-voltage operation via LV control, higher power efficiency, smaller VSSOP footprint, and guaranteed diode-free operation - making it optimal for space-constrained, battery-powered designs requiring wide input range.
Availability
TL7660CDGKR is available at Aetrix Electronics and suitable for portable instrumentation, data acquisition systems, and industrial sensor transmitters requiring stable component supply with guaranteed long-term availability and traceable sourcing.
Supply support for TL7660CDGKR includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Texas Instruments is a global semiconductor company headquartered in Dallas, Texas, delivering analog and embedded processing solutions for industrial, automotive, and personal electronics markets.
The TL7660 product line was designed specifically for low-power, capacitor-based voltage inversion in space- and cost-constrained applications where inductors are undesirable - targeting portable medical devices, handheld test equipment, and battery-powered analog signal chains.
FAQ
What is the minimum input voltage supported by the TL7660CDGKR?
The TL7660CDGKR supports a minimum input voltage of 1.5 V. For operation below 3.5 V, the LV pin (pin 6) must be tied to GND to bypass the internal linear regulator. This ensures stable oscillation and charge-pump functionality down to the 1.5 V limit, as verified in TI's SCAS794 datasheet under "Supply voltage range (low)" parameter.
Can the TL7660CDGKR generate positive voltage doubling?
Yes, the TL7660CDGKR can be configured as a positive voltage doubler by reconfiguring external diodes and capacitors per Figure 9 in the datasheet. In this mode, it delivers VOUT ≈ (2 × VCC) – (2 × VF), where VF is the forward voltage of external diodes. The TL7660CDGKR itself remains unchanged - only external component routing differs from the standard negative-converter configuration.
Is the TL7660CDGKR pin-compatible with the MAX1044?
No, the TL7660CDGKR is not pin-compatible with the MAX1044. While both are 8-pin switched-capacitor voltage converters, their pin assignments differ: TL7660CDGKR uses pin 6 for LV control and pin 7 for OSC, whereas MAX1044 assigns pin 6 to VOUT and pin 7 to GND. Direct substitution would require PCB redesign and is not recommended without validation.
What happens if the LV pin is incorrectly tied to GND when VCC exceeds 3.5 V?
If the LV pin is tied to GND while VCC > 3.5 V, the TL7660CDGKR may experience destructive latch-up due to improper substrate biasing of internal N-channel switches. TI explicitly warns against this in the "Do's and Don'ts" section. The device could fail catastrophically or exhibit erratic output behavior - always leave LV floating for VCC > 3.5 V.
Does the TL7660CDGKR require special capacitor types for stable operation?
The TL7660CDGKR is designed to work with standard 10 µF polarized aluminum electrolytic capacitors for C1 and C2, as confirmed in the "Typical Applications" section. However, low-ESR variants reduce output ripple and improve efficiency - especially under load. Ceramic capacitors are not recommended for C1/C2 due to microphonic effects and insufficient capacitance retention at bias; tantalum is acceptable but requires voltage derating.
TL7660CDGKR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Ratiometric
- Output Configuration:
- Positive or Negative
- Topology:
- Charge Pump
- Output Type:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 1.5V
- Voltage - Input (Max):
- 10V
- Voltage - Output (Min/Fixed):
- -Vin, 2Vin
- Voltage - Output (Max):
- -
- Current - Output:
- -
- Frequency - Switching:
- 10kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-VSSOP
TL7660CDGKR FAQ
1.How can I place an order for TL7660CDGKR through Aetrix?
Please submit a Request for Quotation (RFQ) for TL7660CDGKR on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for TL7660CDGKR reliable?
The price and inventory of TL7660CDGKR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TL7660CDGKR is usually 5 days.
3.What payment methods are accepted for TL7660CDGKR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TL7660CDGKR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TL7660CDGKR?
TL7660CDGKR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TL7660CDGKR order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for TL7660CDGKR?
For technical support, including TL7660CDGKR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TL7660CDGKR requirements.
6.How does Aetrix verify that TL7660CDGKR is sourced from the original manufacturer or authorized distributors?
All TL7660CDGKR products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that TL7660CDGKR meets industry standards.
7.What is the process for return or replacement of TL7660CDGKR?
All TL7660CDGKR units undergo pre-shipment inspection (PSI). If there is an issue with TL7660CDGKR, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The TL7660CDGKR part is unused and in its original packaging.
Return procedure for TL7660CDGKR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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