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Texas Instruments TL7660CDGKT
- Part No.:
- TL7660CDGKT
- Manufacturer:
- Texas Instruments
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
TL7660CDGKT.pdf
- Description:
- IC REG CHARGE PUMP INV 8VSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:544
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Product details
Overview
TL7660CDGKT from Texas Instruments is a CMOS switched-capacitor voltage converter that generates a regulated negative output voltage (–VIN) from a positive input supply of 1.5 V to 10 V, requiring only two external noncritical capacitors. It operates as a negative voltage converter or voltage doubler, delivers up to 20 mA output current, achieves 98% typical power efficiency, and features an internal 10 kHz oscillator (adjustable via OSC pin). It is widely used in portable instrumentation and low-power analog front-ends where dual-rail supplies are needed without inductors.
For engineers reviewing the TL7660CDGKT datasheet, TL7660CDGKT pinout, TL7660CDGKT application, or TL7660CDGKT equivalent, key selection criteria include its 8-pin VSSOP package, LV pin logic for low-voltage bypass, ±1.5 V to ±10 V output range, latchup-proof substrate biasing, and compatibility with polarized electrolytic pump/reservoir capacitors.
Technical Context
The TL7660CDGKT 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 anti-latchup logic network dynamically biases switch substrates based on real-time VOUT sensing, eliminating external diodes across the full temperature and voltage range.
Oscillator frequency defaults to ~10 kHz at VCC = 5 V but is scalable from ~3 kHz to >100 kHz using external capacitor or clock injection on the OSC pin. The LV pin enables regulator bypass below 3.5 V input, reducing dropout and improving efficiency at low supply voltages.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 1.5 V to 10 V - supports single-cell Li-ion, alkaline, and standard logic rails without external regulation. |
| Output Voltage | –VIN (inverter mode) or up to +18.6 V (doubler mode) - provides rail-to-rail complementary supply generation. |
| Max Output Current | 20 mA at VCC = 5 V - sufficient for op-amp biasing, ADC reference, and sensor signal conditioning. |
| Power Efficiency | 98% typical at RL = 5 kΩ - minimizes thermal load and extends battery life in portable systems. |
| Oscillator Frequency | 10 kHz nominal (VCC = 5 V), adjustable via OSC pin - balances ripple, ESR sensitivity, and capacitor size trade-offs. |
| Operating Temperature | –40°C to +85°C - qualified for industrial and consumer-grade embedded applications. |
| Supply Current (no load) | 45 µA typical at 25°C - ultra-low quiescent consumption critical for always-on subsystems. |
Pinout & Package
VSSOP-8 (DGK) package: 3.0 mm × 3.0 mm body, 0.65 mm pitch, exposed pad optional, RoHS-compliant NIPDAU finish, MSL Level-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (NC) | No internal connection | Unused pin - must be left floating or tied to GND; no electrical function. |
| 2 (CAP+) | Pump capacitor positive terminal | Connects to positive lead of C1; forms charge-transfer node during pumping phase. |
| 3 (GND) | Ground reference | System ground return for all internal circuitry and external capacitors. |
| 4 (CAP−) | Pump capacitor negative terminal | Connects to negative lead of C1; alternately referenced to VCC or VOUT during switching cycles. |
| 5 (VOUT) | Negative output terminal | Delivers inverted output voltage; must not exceed GND potential to avoid latchup. |
| 6 (OSC) | Oscillator control | Accepts external capacitor for frequency reduction or TTL/CMOS clock for precise frequency control. |
| 7 (LV) | Low-voltage bypass enable | Tie to GND for VCC < 3.5 V to disable internal regulator; leave open for VCC ≥ 3.5 V. |
| 8 (VCC) | Positive input supply | Primary power input; absolute max 10.5 V; requires local 2.2 µF bypass if source impedance > 25 Ω. |
Key Features
| Feature | Design Value |
|---|---|
| No external diodes required | Integrated substrate biasing and level translation eliminate need for discrete diodes across –40°C to +85°C. |
| Adjustable oscillator | OSC pin supports frequency tuning from ~3 kHz to >100 kHz - enables ripple/noise vs. capacitor size optimization. |
| LV pin logic control | Single-pin enable/disable of internal regulator - improves efficiency below 3.5 V while preventing latchup above. |
| 99.9% voltage conversion efficiency | Open-circuit efficiency preserves output voltage accuracy under light loads, critical for precision references. |
| Latchup-proof architecture | Real-time VOUT sensing and dynamic substrate biasing ensure robust operation during start-up and short-circuit events. |
Applications
| Portable Medical Sensors | Industrial Data Acquisition |
|---|---|
|
Use Scenario: Battery-powered ECG front-end requiring ±5 V rails for op-amp biasing and ADC reference. IC Role / Device Role / Timing Role: Negative voltage generator providing isolated –5 V from 5 V main rail; no inductor or transformer needed. Use Value: Enables compact, low-noise analog signal chain with minimal BOM count and zero magnetic components. |
Use Scenario: 16-bit SAR ADC system in PLC I/O module needing dual-supply op-amps for bipolar signal conditioning. IC Role / Device Role / Timing Role: Precision negative rail generator supporting 100 kSPS sampling with stable headroom. Use Value: Delivers <20 mV ripple at 10 mA load, maintaining SNR > 90 dB without external filtering. |
| Handheld Test Equipment | Automotive Infotainment Audio |
|
Use Scenario: Pocket oscilloscope with active probes requiring ±3.3 V supplies from single 3.7 V Li-ion cell. IC Role / Device Role / Timing Role: Low-voltage inverter operating in LV-bypass mode to minimize dropout at 2.8 V input. Use Value: Sustains –2.8 V output at 15 mA with 96% efficiency, extending runtime by >18% vs. alternative solutions. |
Use Scenario: Class AB audio amplifier stage in infotainment head unit needing clean –12 V rail for output stage bias. IC Role / Device Role / Timing Role: Cascaded TL7660CDGKT configuration generating –12 V from 12 V battery supply. Use Value: Achieves <150 mΩ effective output resistance via paralleling, supporting 50 mA peak current with <50 mV droop. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX1044CPA+ | Pin-compatible 8-pin DIP/SOIC; fixed 10 kHz oscillator; no LV pin or OSC adjustability; 100 mA max output. | Higher output current but larger footprint; lacks low-voltage bypass and frequency tuning - less flexible in space-constrained designs. | Prefer MAX1044CPA+ only when >20 mA load or legacy DIP layout reuse is required. |
| ICL7660SIPAZ | Enhanced version with lower quiescent current (25 µA typ), improved ESD rating, and extended –40°C to +125°C temp range. | Same pinout and function; superior performance at high temp and low power - ideal for automotive under-hood use. | Choose ICL7660SIPAZ for new designs targeting AEC-Q200 compliance or extended temperature operation. |
Compared with TL7660CDGKT, MAX1044CPA+ offers higher current but sacrifices package size and configurability, while ICL7660SIPAZ delivers identical functionality with better efficiency and temperature resilience - making it the preferred upgrade path for demanding environments.
Availability
TL7660CDGKT is available at Aetrix Electronics and suitable for portable medical sensors, industrial data acquisition systems, handheld test equipment, and automotive infotainment audio requiring stable component supply and long-term production continuity.
Supply support for TL7660CDGKT 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 leader specializing in analog, embedded processing, and connectivity technologies, with over 90 years of innovation in power management and precision analog ICs.
The TL7660 product line delivers compact, inductorless DC/DC voltage conversion for space- and cost-sensitive applications where dual-rail supplies are essential - targeting portable instrumentation, sensor interfaces, and legacy system upgrades.
FAQ
What is the maximum input voltage the TL7660CDGKT can handle?
The TL7660CDGKT has an absolute maximum supply voltage of 10.5 V. Its recommended operating range is 1.5 V to 10 V. Exceeding 10.5 V risks permanent damage. For reliable operation at 10 V input, ensure proper PCB layout with adequate decoupling and thermal relief, as power dissipation increases near the upper limit. The TL7660CDGKT maintains stable –10 V output under these conditions when loaded ≤10 mA.
Can the TL7660CDGKT generate positive voltage doubling?
Yes, the TL7660CDGKT can be configured as a voltage doubler to generate up to +18.6 V from a 10 V input using external diodes and capacitors per Figure 9 in the datasheet. This mode requires D1 and D2 (e.g., 1N4148), C1 and C2, and modifies the connection of CAP+, CAP−, and VOUT. The TL7660CDGKT itself remains unchanged - only the external network differs from inverter mode.
How does the LV pin affect TL7660CDGKT operation below 3.5 V?
When VCC < 3.5 V, the LV pin must be tied to GND to disable the internal series regulator, reducing dropout and improving efficiency. Leaving LV open under this condition causes excessive power loss and possible malfunction. At 2.5 V input, tying LV to GND enables the TL7660CDGKT to deliver –2.5 V at 10 mA with 95% efficiency - versus <80% if LV is left floating.
Is the TL7660CDGKT pin-compatible with other package variants like TL7660CDR?
Yes, the TL7660CDGKT (VSSOP-8) shares identical pinout, function, and electrical specifications with TL7660CDR (SOIC-8) and TL7660CP (PDIP-8). All variants use the same 8-pin numbering and terminal assignments. However, thermal impedance differs significantly: DGK (172°C/W) vs. D (97°C/W), so layout cooling provisions must be adjusted accordingly for equivalent power handling.
What external capacitors are required for basic TL7660CDGKT operation?
The TL7660CDGKT requires two external capacitors: a 10 µF polarized electrolytic capacitor between CAP+ (pin 2) and CAP− (pin 4) as the pump capacitor (C1), and another 10 µF polarized capacitor between VOUT (pin 5) and GND (pin 3) as the reservoir (C2). Polarity must follow datasheet guidance: C1's positive terminal connects to pin 2; C2's positive terminal connects to GND. Low-ESR types improve ripple and efficiency.
TL7660CDGKT 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
TL7660CDGKT FAQ
1.How can I place an order for TL7660CDGKT through Aetrix?
Please submit a Request for Quotation (RFQ) for TL7660CDGKT 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 TL7660CDGKT reliable?
The price and inventory of TL7660CDGKT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TL7660CDGKT is usually 5 days.
3.What payment methods are accepted for TL7660CDGKT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TL7660CDGKT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TL7660CDGKT?
TL7660CDGKT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TL7660CDGKT 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 TL7660CDGKT?
For technical support, including TL7660CDGKT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TL7660CDGKT requirements.
6.How does Aetrix verify that TL7660CDGKT is sourced from the original manufacturer or authorized distributors?
All TL7660CDGKT 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 TL7660CDGKT meets industry standards.
7.What is the process for return or replacement of TL7660CDGKT?
All TL7660CDGKT units undergo pre-shipment inspection (PSI). If there is an issue with TL7660CDGKT, 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 TL7660CDGKT part is unused and in its original packaging.
Return procedure for TL7660CDGKT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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